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OpenFPGA/libs/EXTERNAL/tcl8.6.12/generic/tclCompile.c

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/*
* tclCompile.c --
*
* This file contains procedures that compile Tcl commands or parts of
* commands (like quoted strings or nested sub-commands) into a sequence
* of instructions ("bytecodes").
*
* Copyright (c) 1996-1998 Sun Microsystems, Inc.
* Copyright (c) 2001 by Kevin B. Kenny. All rights reserved.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tclInt.h"
#include "tclCompile.h"
#include <assert.h>
/*
* Variable that controls whether compilation tracing is enabled and, if so,
* what level of tracing is desired:
* 0: no compilation tracing
* 1: summarize compilation of top level cmds and proc bodies
* 2: display all instructions of each ByteCode compiled
* This variable is linked to the Tcl variable "tcl_traceCompile".
*/
#ifdef TCL_COMPILE_DEBUG
int tclTraceCompile = 0;
static int traceInitialized = 0;
#endif
/*
* A table describing the Tcl bytecode instructions. Entries in this table
* must correspond to the instruction opcode definitions in tclCompile.h. The
* names "op1" and "op4" refer to an instruction's one or four byte first
* operand. Similarly, "stktop" and "stknext" refer to the topmost and next to
* topmost stack elements.
*
* Note that the load, store, and incr instructions do not distinguish local
* from global variables; the bytecode interpreter at runtime uses the
* existence of a procedure call frame to distinguish these.
*/
InstructionDesc const tclInstructionTable[] = {
/* Name Bytes stackEffect #Opnds Operand types */
{"done", 1, -1, 0, {OPERAND_NONE}},
/* Finish ByteCode execution and return stktop (top stack item) */
{"push1", 2, +1, 1, {OPERAND_LIT1}},
/* Push object at ByteCode objArray[op1] */
{"push4", 5, +1, 1, {OPERAND_LIT4}},
/* Push object at ByteCode objArray[op4] */
{"pop", 1, -1, 0, {OPERAND_NONE}},
/* Pop the topmost stack object */
{"dup", 1, +1, 0, {OPERAND_NONE}},
/* Duplicate the topmost stack object and push the result */
{"strcat", 2, INT_MIN, 1, {OPERAND_UINT1}},
/* Concatenate the top op1 items and push result */
{"invokeStk1", 2, INT_MIN, 1, {OPERAND_UINT1}},
/* Invoke command named objv[0]; <objc,objv> = <op1,top op1> */
{"invokeStk4", 5, INT_MIN, 1, {OPERAND_UINT4}},
/* Invoke command named objv[0]; <objc,objv> = <op4,top op4> */
{"evalStk", 1, 0, 0, {OPERAND_NONE}},
/* Evaluate command in stktop using Tcl_EvalObj. */
{"exprStk", 1, 0, 0, {OPERAND_NONE}},
/* Execute expression in stktop using Tcl_ExprStringObj. */
{"loadScalar1", 2, 1, 1, {OPERAND_LVT1}},
/* Load scalar variable at index op1 <= 255 in call frame */
{"loadScalar4", 5, 1, 1, {OPERAND_LVT4}},
/* Load scalar variable at index op1 >= 256 in call frame */
{"loadScalarStk", 1, 0, 0, {OPERAND_NONE}},
/* Load scalar variable; scalar's name is stktop */
{"loadArray1", 2, 0, 1, {OPERAND_LVT1}},
/* Load array element; array at slot op1<=255, element is stktop */
{"loadArray4", 5, 0, 1, {OPERAND_LVT4}},
/* Load array element; array at slot op1 > 255, element is stktop */
{"loadArrayStk", 1, -1, 0, {OPERAND_NONE}},
/* Load array element; element is stktop, array name is stknext */
{"loadStk", 1, 0, 0, {OPERAND_NONE}},
/* Load general variable; unparsed variable name is stktop */
{"storeScalar1", 2, 0, 1, {OPERAND_LVT1}},
/* Store scalar variable at op1<=255 in frame; value is stktop */
{"storeScalar4", 5, 0, 1, {OPERAND_LVT4}},
/* Store scalar variable at op1 > 255 in frame; value is stktop */
{"storeScalarStk", 1, -1, 0, {OPERAND_NONE}},
/* Store scalar; value is stktop, scalar name is stknext */
{"storeArray1", 2, -1, 1, {OPERAND_LVT1}},
/* Store array element; array at op1<=255, value is top then elem */
{"storeArray4", 5, -1, 1, {OPERAND_LVT4}},
/* Store array element; array at op1>=256, value is top then elem */
{"storeArrayStk", 1, -2, 0, {OPERAND_NONE}},
/* Store array element; value is stktop, then elem, array names */
{"storeStk", 1, -1, 0, {OPERAND_NONE}},
/* Store general variable; value is stktop, then unparsed name */
{"incrScalar1", 2, 0, 1, {OPERAND_LVT1}},
/* Incr scalar at index op1<=255 in frame; incr amount is stktop */
{"incrScalarStk", 1, -1, 0, {OPERAND_NONE}},
/* Incr scalar; incr amount is stktop, scalar's name is stknext */
{"incrArray1", 2, -1, 1, {OPERAND_LVT1}},
/* Incr array elem; arr at slot op1<=255, amount is top then elem */
{"incrArrayStk", 1, -2, 0, {OPERAND_NONE}},
/* Incr array element; amount is top then elem then array names */
{"incrStk", 1, -1, 0, {OPERAND_NONE}},
/* Incr general variable; amount is stktop then unparsed var name */
{"incrScalar1Imm", 3, +1, 2, {OPERAND_LVT1, OPERAND_INT1}},
/* Incr scalar at slot op1 <= 255; amount is 2nd operand byte */
{"incrScalarStkImm", 2, 0, 1, {OPERAND_INT1}},
/* Incr scalar; scalar name is stktop; incr amount is op1 */
{"incrArray1Imm", 3, 0, 2, {OPERAND_LVT1, OPERAND_INT1}},
/* Incr array elem; array at slot op1 <= 255, elem is stktop,
* amount is 2nd operand byte */
{"incrArrayStkImm", 2, -1, 1, {OPERAND_INT1}},
/* Incr array element; elem is top then array name, amount is op1 */
{"incrStkImm", 2, 0, 1, {OPERAND_INT1}},
/* Incr general variable; unparsed name is top, amount is op1 */
{"jump1", 2, 0, 1, {OPERAND_OFFSET1}},
/* Jump relative to (pc + op1) */
{"jump4", 5, 0, 1, {OPERAND_OFFSET4}},
/* Jump relative to (pc + op4) */
{"jumpTrue1", 2, -1, 1, {OPERAND_OFFSET1}},
/* Jump relative to (pc + op1) if stktop expr object is true */
{"jumpTrue4", 5, -1, 1, {OPERAND_OFFSET4}},
/* Jump relative to (pc + op4) if stktop expr object is true */
{"jumpFalse1", 2, -1, 1, {OPERAND_OFFSET1}},
/* Jump relative to (pc + op1) if stktop expr object is false */
{"jumpFalse4", 5, -1, 1, {OPERAND_OFFSET4}},
/* Jump relative to (pc + op4) if stktop expr object is false */
{"lor", 1, -1, 0, {OPERAND_NONE}},
/* Logical or: push (stknext || stktop) */
{"land", 1, -1, 0, {OPERAND_NONE}},
/* Logical and: push (stknext && stktop) */
{"bitor", 1, -1, 0, {OPERAND_NONE}},
/* Bitwise or: push (stknext | stktop) */
{"bitxor", 1, -1, 0, {OPERAND_NONE}},
/* Bitwise xor push (stknext ^ stktop) */
{"bitand", 1, -1, 0, {OPERAND_NONE}},
/* Bitwise and: push (stknext & stktop) */
{"eq", 1, -1, 0, {OPERAND_NONE}},
/* Equal: push (stknext == stktop) */
{"neq", 1, -1, 0, {OPERAND_NONE}},
/* Not equal: push (stknext != stktop) */
{"lt", 1, -1, 0, {OPERAND_NONE}},
/* Less: push (stknext < stktop) */
{"gt", 1, -1, 0, {OPERAND_NONE}},
/* Greater: push (stknext > stktop) */
{"le", 1, -1, 0, {OPERAND_NONE}},
/* Less or equal: push (stknext <= stktop) */
{"ge", 1, -1, 0, {OPERAND_NONE}},
/* Greater or equal: push (stknext >= stktop) */
{"lshift", 1, -1, 0, {OPERAND_NONE}},
/* Left shift: push (stknext << stktop) */
{"rshift", 1, -1, 0, {OPERAND_NONE}},
/* Right shift: push (stknext >> stktop) */
{"add", 1, -1, 0, {OPERAND_NONE}},
/* Add: push (stknext + stktop) */
{"sub", 1, -1, 0, {OPERAND_NONE}},
/* Sub: push (stkext - stktop) */
{"mult", 1, -1, 0, {OPERAND_NONE}},
/* Multiply: push (stknext * stktop) */
{"div", 1, -1, 0, {OPERAND_NONE}},
/* Divide: push (stknext / stktop) */
{"mod", 1, -1, 0, {OPERAND_NONE}},
/* Mod: push (stknext % stktop) */
{"uplus", 1, 0, 0, {OPERAND_NONE}},
/* Unary plus: push +stktop */
{"uminus", 1, 0, 0, {OPERAND_NONE}},
/* Unary minus: push -stktop */
{"bitnot", 1, 0, 0, {OPERAND_NONE}},
/* Bitwise not: push ~stktop */
{"not", 1, 0, 0, {OPERAND_NONE}},
/* Logical not: push !stktop */
{"callBuiltinFunc1", 2, 1, 1, {OPERAND_UINT1}},
/* Call builtin math function with index op1; any args are on stk */
{"callFunc1", 2, INT_MIN, 1, {OPERAND_UINT1}},
/* Call non-builtin func objv[0]; <objc,objv>=<op1,top op1> */
{"tryCvtToNumeric", 1, 0, 0, {OPERAND_NONE}},
/* Try converting stktop to first int then double if possible. */
{"break", 1, 0, 0, {OPERAND_NONE}},
/* Abort closest enclosing loop; if none, return TCL_BREAK code. */
{"continue", 1, 0, 0, {OPERAND_NONE}},
/* Skip to next iteration of closest enclosing loop; if none, return
* TCL_CONTINUE code. */
{"foreach_start4", 5, 0, 1, {OPERAND_AUX4}},
/* Initialize execution of a foreach loop. Operand is aux data index
* of the ForeachInfo structure for the foreach command. */
{"foreach_step4", 5, +1, 1, {OPERAND_AUX4}},
/* "Step" or begin next iteration of foreach loop. Push 0 if to
* terminate loop, else push 1. */
{"beginCatch4", 5, 0, 1, {OPERAND_UINT4}},
/* Record start of catch with the operand's exception index. Push the
* current stack depth onto a special catch stack. */
{"endCatch", 1, 0, 0, {OPERAND_NONE}},
/* End of last catch. Pop the bytecode interpreter's catch stack. */
{"pushResult", 1, +1, 0, {OPERAND_NONE}},
/* Push the interpreter's object result onto the stack. */
{"pushReturnCode", 1, +1, 0, {OPERAND_NONE}},
/* Push interpreter's return code (e.g. TCL_OK or TCL_ERROR) as a new
* object onto the stack. */
{"streq", 1, -1, 0, {OPERAND_NONE}},
/* Str Equal: push (stknext eq stktop) */
{"strneq", 1, -1, 0, {OPERAND_NONE}},
/* Str !Equal: push (stknext neq stktop) */
{"strcmp", 1, -1, 0, {OPERAND_NONE}},
/* Str Compare: push (stknext cmp stktop) */
{"strlen", 1, 0, 0, {OPERAND_NONE}},
/* Str Length: push (strlen stktop) */
{"strindex", 1, -1, 0, {OPERAND_NONE}},
/* Str Index: push (strindex stknext stktop) */
{"strmatch", 2, -1, 1, {OPERAND_INT1}},
/* Str Match: push (strmatch stknext stktop) opnd == nocase */
{"list", 5, INT_MIN, 1, {OPERAND_UINT4}},
/* List: push (stk1 stk2 ... stktop) */
{"listIndex", 1, -1, 0, {OPERAND_NONE}},
/* List Index: push (listindex stknext stktop) */
{"listLength", 1, 0, 0, {OPERAND_NONE}},
/* List Len: push (listlength stktop) */
{"appendScalar1", 2, 0, 1, {OPERAND_LVT1}},
/* Append scalar variable at op1<=255 in frame; value is stktop */
{"appendScalar4", 5, 0, 1, {OPERAND_LVT4}},
/* Append scalar variable at op1 > 255 in frame; value is stktop */
{"appendArray1", 2, -1, 1, {OPERAND_LVT1}},
/* Append array element; array at op1<=255, value is top then elem */
{"appendArray4", 5, -1, 1, {OPERAND_LVT4}},
/* Append array element; array at op1>=256, value is top then elem */
{"appendArrayStk", 1, -2, 0, {OPERAND_NONE}},
/* Append array element; value is stktop, then elem, array names */
{"appendStk", 1, -1, 0, {OPERAND_NONE}},
/* Append general variable; value is stktop, then unparsed name */
{"lappendScalar1", 2, 0, 1, {OPERAND_LVT1}},
/* Lappend scalar variable at op1<=255 in frame; value is stktop */
{"lappendScalar4", 5, 0, 1, {OPERAND_LVT4}},
/* Lappend scalar variable at op1 > 255 in frame; value is stktop */
{"lappendArray1", 2, -1, 1, {OPERAND_LVT1}},
/* Lappend array element; array at op1<=255, value is top then elem */
{"lappendArray4", 5, -1, 1, {OPERAND_LVT4}},
/* Lappend array element; array at op1>=256, value is top then elem */
{"lappendArrayStk", 1, -2, 0, {OPERAND_NONE}},
/* Lappend array element; value is stktop, then elem, array names */
{"lappendStk", 1, -1, 0, {OPERAND_NONE}},
/* Lappend general variable; value is stktop, then unparsed name */
{"lindexMulti", 5, INT_MIN, 1, {OPERAND_UINT4}},
/* Lindex with generalized args, operand is number of stacked objs
* used: (operand-1) entries from stktop are the indices; then list to
* process. */
{"over", 5, +1, 1, {OPERAND_UINT4}},
/* Duplicate the arg-th element from top of stack (TOS=0) */
{"lsetList", 1, -2, 0, {OPERAND_NONE}},
/* Four-arg version of 'lset'. stktop is old value; next is new
* element value, next is the index list; pushes new value */
{"lsetFlat", 5, INT_MIN, 1, {OPERAND_UINT4}},
/* Three- or >=5-arg version of 'lset', operand is number of stacked
* objs: stktop is old value, next is new element value, next come
* (operand-2) indices; pushes the new value.
*/
{"returnImm", 9, -1, 2, {OPERAND_INT4, OPERAND_UINT4}},
/* Compiled [return], code, level are operands; options and result
* are on the stack. */
{"expon", 1, -1, 0, {OPERAND_NONE}},
/* Binary exponentiation operator: push (stknext ** stktop) */
/*
* NOTE: the stack effects of expandStkTop and invokeExpanded are wrong -
* but it cannot be done right at compile time, the stack effect is only
* known at run time. The value for invokeExpanded is estimated better at
* compile time.
* See the comments further down in this file, where INST_INVOKE_EXPANDED
* is emitted.
*/
{"expandStart", 1, 0, 0, {OPERAND_NONE}},
/* Start of command with {*} (expanded) arguments */
{"expandStkTop", 5, 0, 1, {OPERAND_UINT4}},
/* Expand the list at stacktop: push its elements on the stack */
{"invokeExpanded", 1, 0, 0, {OPERAND_NONE}},
/* Invoke the command marked by the last 'expandStart' */
{"listIndexImm", 5, 0, 1, {OPERAND_IDX4}},
/* List Index: push (lindex stktop op4) */
{"listRangeImm", 9, 0, 2, {OPERAND_IDX4, OPERAND_IDX4}},
/* List Range: push (lrange stktop op4 op4) */
{"startCommand", 9, 0, 2, {OPERAND_OFFSET4, OPERAND_UINT4}},
/* Start of bytecoded command: op is the length of the cmd's code, op2
* is number of commands here */
{"listIn", 1, -1, 0, {OPERAND_NONE}},
/* List containment: push [lsearch stktop stknext]>=0) */
{"listNotIn", 1, -1, 0, {OPERAND_NONE}},
/* List negated containment: push [lsearch stktop stknext]<0) */
{"pushReturnOpts", 1, +1, 0, {OPERAND_NONE}},
/* Push the interpreter's return option dictionary as an object on the
* stack. */
{"returnStk", 1, -1, 0, {OPERAND_NONE}},
/* Compiled [return]; options and result are on the stack, code and
* level are in the options. */
{"dictGet", 5, INT_MIN, 1, {OPERAND_UINT4}},
/* The top op4 words (min 1) are a key path into the dictionary just
* below the keys on the stack, and all those values are replaced by
* the value read out of that key-path (like [dict get]).
* Stack: ... dict key1 ... keyN => ... value */
{"dictSet", 9, INT_MIN, 2, {OPERAND_UINT4, OPERAND_LVT4}},
/* Update a dictionary value such that the keys are a path pointing to
* the value. op4#1 = numKeys, op4#2 = LVTindex
* Stack: ... key1 ... keyN value => ... newDict */
{"dictUnset", 9, INT_MIN, 2, {OPERAND_UINT4, OPERAND_LVT4}},
/* Update a dictionary value such that the keys are not a path pointing
* to any value. op4#1 = numKeys, op4#2 = LVTindex
* Stack: ... key1 ... keyN => ... newDict */
{"dictIncrImm", 9, 0, 2, {OPERAND_INT4, OPERAND_LVT4}},
/* Update a dictionary value such that the value pointed to by key is
* incremented by some value (or set to it if the key isn't in the
* dictionary at all). op4#1 = incrAmount, op4#2 = LVTindex
* Stack: ... key => ... newDict */
{"dictAppend", 5, -1, 1, {OPERAND_LVT4}},
/* Update a dictionary value such that the value pointed to by key has
* some value string-concatenated onto it. op4 = LVTindex
* Stack: ... key valueToAppend => ... newDict */
{"dictLappend", 5, -1, 1, {OPERAND_LVT4}},
/* Update a dictionary value such that the value pointed to by key has
* some value list-appended onto it. op4 = LVTindex
* Stack: ... key valueToAppend => ... newDict */
{"dictFirst", 5, +2, 1, {OPERAND_LVT4}},
/* Begin iterating over the dictionary, using the local scalar
* indicated by op4 to hold the iterator state. The local scalar
* should not refer to a named variable as the value is not wholly
* managed correctly.
* Stack: ... dict => ... value key doneBool */
{"dictNext", 5, +3, 1, {OPERAND_LVT4}},
/* Get the next iteration from the iterator in op4's local scalar.
* Stack: ... => ... value key doneBool */
{"dictDone", 5, 0, 1, {OPERAND_LVT4}},
/* Terminate the iterator in op4's local scalar. Use unsetScalar
* instead (with 0 for flags). */
{"dictUpdateStart", 9, 0, 2, {OPERAND_LVT4, OPERAND_AUX4}},
/* Create the variables (described in the aux data referred to by the
* second immediate argument) to mirror the state of the dictionary in
* the variable referred to by the first immediate argument. The list
* of keys (top of the stack, not popped) must be the same length as
* the list of variables.
* Stack: ... keyList => ... keyList */
{"dictUpdateEnd", 9, -1, 2, {OPERAND_LVT4, OPERAND_AUX4}},
/* Reflect the state of local variables (described in the aux data
* referred to by the second immediate argument) back to the state of
* the dictionary in the variable referred to by the first immediate
* argument. The list of keys (popped from the stack) must be the same
* length as the list of variables.
* Stack: ... keyList => ... */
{"jumpTable", 5, -1, 1, {OPERAND_AUX4}},
/* Jump according to the jump-table (in AuxData as indicated by the
* operand) and the argument popped from the list. Always executes the
* next instruction if no match against the table's entries was found.
* Stack: ... value => ...
* Note that the jump table contains offsets relative to the PC when
* it points to this instruction; the code is relocatable. */
{"upvar", 5, -1, 1, {OPERAND_LVT4}},
/* finds level and otherName in stack, links to local variable at
* index op1. Leaves the level on stack. */
{"nsupvar", 5, -1, 1, {OPERAND_LVT4}},
/* finds namespace and otherName in stack, links to local variable at
* index op1. Leaves the namespace on stack. */
{"variable", 5, -1, 1, {OPERAND_LVT4}},
/* finds namespace and otherName in stack, links to local variable at
* index op1. Leaves the namespace on stack. */
{"syntax", 9, -1, 2, {OPERAND_INT4, OPERAND_UINT4}},
/* Compiled bytecodes to signal syntax error. Equivalent to returnImm
* except for the ERR_ALREADY_LOGGED flag in the interpreter. */
{"reverse", 5, 0, 1, {OPERAND_UINT4}},
/* Reverse the order of the arg elements at the top of stack */
{"regexp", 2, -1, 1, {OPERAND_INT1}},
/* Regexp: push (regexp stknext stktop) opnd == nocase */
{"existScalar", 5, 1, 1, {OPERAND_LVT4}},
/* Test if scalar variable at index op1 in call frame exists */
{"existArray", 5, 0, 1, {OPERAND_LVT4}},
/* Test if array element exists; array at slot op1, element is
* stktop */
{"existArrayStk", 1, -1, 0, {OPERAND_NONE}},
/* Test if array element exists; element is stktop, array name is
* stknext */
{"existStk", 1, 0, 0, {OPERAND_NONE}},
/* Test if general variable exists; unparsed variable name is stktop*/
{"nop", 1, 0, 0, {OPERAND_NONE}},
/* Do nothing */
{"returnCodeBranch", 1, -1, 0, {OPERAND_NONE}},
/* Jump to next instruction based on the return code on top of stack
* ERROR: +1; RETURN: +3; BREAK: +5; CONTINUE: +7;
* Other non-OK: +9
*/
{"unsetScalar", 6, 0, 2, {OPERAND_UINT1, OPERAND_LVT4}},
/* Make scalar variable at index op2 in call frame cease to exist;
* op1 is 1 for errors on problems, 0 otherwise */
{"unsetArray", 6, -1, 2, {OPERAND_UINT1, OPERAND_LVT4}},
/* Make array element cease to exist; array at slot op2, element is
* stktop; op1 is 1 for errors on problems, 0 otherwise */
{"unsetArrayStk", 2, -2, 1, {OPERAND_UINT1}},
/* Make array element cease to exist; element is stktop, array name is
* stknext; op1 is 1 for errors on problems, 0 otherwise */
{"unsetStk", 2, -1, 1, {OPERAND_UINT1}},
/* Make general variable cease to exist; unparsed variable name is
* stktop; op1 is 1 for errors on problems, 0 otherwise */
{"dictExpand", 1, -1, 0, {OPERAND_NONE}},
/* Probe into a dict and extract it (or a subdict of it) into
* variables with matched names. Produces list of keys bound as
* result. Part of [dict with].
* Stack: ... dict path => ... keyList */
{"dictRecombineStk", 1, -3, 0, {OPERAND_NONE}},
/* Map variable contents back into a dictionary in a variable. Part of
* [dict with].
* Stack: ... dictVarName path keyList => ... */
{"dictRecombineImm", 5, -2, 1, {OPERAND_LVT4}},
/* Map variable contents back into a dictionary in the local variable
* indicated by the LVT index. Part of [dict with].
* Stack: ... path keyList => ... */
{"dictExists", 5, INT_MIN, 1, {OPERAND_UINT4}},
/* The top op4 words (min 1) are a key path into the dictionary just
* below the keys on the stack, and all those values are replaced by a
* boolean indicating whether it is possible to read out a value from
* that key-path (like [dict exists]).
* Stack: ... dict key1 ... keyN => ... boolean */
{"verifyDict", 1, -1, 0, {OPERAND_NONE}},
/* Verifies that the word on the top of the stack is a dictionary,
* popping it if it is and throwing an error if it is not.
* Stack: ... value => ... */
{"strmap", 1, -2, 0, {OPERAND_NONE}},
/* Simplified version of [string map] that only applies one change
* string, and only case-sensitively.
* Stack: ... from to string => ... changedString */
{"strfind", 1, -1, 0, {OPERAND_NONE}},
/* Find the first index of a needle string in a haystack string,
* producing the index (integer) or -1 if nothing found.
* Stack: ... needle haystack => ... index */
{"strrfind", 1, -1, 0, {OPERAND_NONE}},
/* Find the last index of a needle string in a haystack string,
* producing the index (integer) or -1 if nothing found.
* Stack: ... needle haystack => ... index */
{"strrangeImm", 9, 0, 2, {OPERAND_IDX4, OPERAND_IDX4}},
/* String Range: push (string range stktop op4 op4) */
{"strrange", 1, -2, 0, {OPERAND_NONE}},
/* String Range with non-constant arguments.
* Stack: ... string idxA idxB => ... substring */
{"yield", 1, 0, 0, {OPERAND_NONE}},
/* Makes the current coroutine yield the value at the top of the
* stack, and places the response back on top of the stack when it
* resumes.
* Stack: ... valueToYield => ... resumeValue */
{"coroName", 1, +1, 0, {OPERAND_NONE}},
/* Push the name of the interpreter's current coroutine as an object
* on the stack. */
{"tailcall", 2, INT_MIN, 1, {OPERAND_UINT1}},
/* Do a tailcall with the opnd items on the stack as the thing to
* tailcall to; opnd must be greater than 0 for the semantics to work
* right. */
{"currentNamespace", 1, +1, 0, {OPERAND_NONE}},
/* Push the name of the interpreter's current namespace as an object
* on the stack. */
{"infoLevelNumber", 1, +1, 0, {OPERAND_NONE}},
/* Push the stack depth (i.e., [info level]) of the interpreter as an
* object on the stack. */
{"infoLevelArgs", 1, 0, 0, {OPERAND_NONE}},
/* Push the argument words to a stack depth (i.e., [info level <n>])
* of the interpreter as an object on the stack.
* Stack: ... depth => ... argList */
{"resolveCmd", 1, 0, 0, {OPERAND_NONE}},
/* Resolves the command named on the top of the stack to its fully
* qualified version, or produces the empty string if no such command
* exists. Never generates errors.
* Stack: ... cmdName => ... fullCmdName */
{"tclooSelf", 1, +1, 0, {OPERAND_NONE}},
/* Push the identity of the current TclOO object (i.e., the name of
* its current public access command) on the stack. */
{"tclooClass", 1, 0, 0, {OPERAND_NONE}},
/* Push the class of the TclOO object named at the top of the stack
* onto the stack.
* Stack: ... object => ... class */
{"tclooNamespace", 1, 0, 0, {OPERAND_NONE}},
/* Push the namespace of the TclOO object named at the top of the
* stack onto the stack.
* Stack: ... object => ... namespace */
{"tclooIsObject", 1, 0, 0, {OPERAND_NONE}},
/* Push whether the value named at the top of the stack is a TclOO
* object (i.e., a boolean). Can corrupt the interpreter result
* despite not throwing, so not safe for use in a post-exception
* context.
* Stack: ... value => ... boolean */
{"arrayExistsStk", 1, 0, 0, {OPERAND_NONE}},
/* Looks up the element on the top of the stack and tests whether it
* is an array. Pushes a boolean describing whether this is the
* case. Also runs the whole-array trace on the named variable, so can
* throw anything.
* Stack: ... varName => ... boolean */
{"arrayExistsImm", 5, +1, 1, {OPERAND_LVT4}},
/* Looks up the variable indexed by opnd and tests whether it is an
* array. Pushes a boolean describing whether this is the case. Also
* runs the whole-array trace on the named variable, so can throw
* anything.
* Stack: ... => ... boolean */
{"arrayMakeStk", 1, -1, 0, {OPERAND_NONE}},
/* Forces the element on the top of the stack to be the name of an
* array.
* Stack: ... varName => ... */
{"arrayMakeImm", 5, 0, 1, {OPERAND_LVT4}},
/* Forces the variable indexed by opnd to be an array. Does not touch
* the stack. */
{"invokeReplace", 6, INT_MIN, 2, {OPERAND_UINT4,OPERAND_UINT1}},
/* Invoke command named objv[0], replacing the first two words with
* the word at the top of the stack;
* <objc,objv> = <op4,top op4 after popping 1> */
{"listConcat", 1, -1, 0, {OPERAND_NONE}},
/* Concatenates the two lists at the top of the stack into a single
* list and pushes that resulting list onto the stack.
* Stack: ... list1 list2 => ... [lconcat list1 list2] */
{"expandDrop", 1, 0, 0, {OPERAND_NONE}},
/* Drops an element from the auxiliary stack, popping stack elements
* until the matching stack depth is reached. */
/* New foreach implementation */
{"foreach_start", 5, +2, 1, {OPERAND_AUX4}},
/* Initialize execution of a foreach loop. Operand is aux data index
* of the ForeachInfo structure for the foreach command. It pushes 2
* elements which hold runtime params for foreach_step, they are later
* dropped by foreach_end together with the value lists. NOTE that the
* iterator-tracker and info reference must not be passed to bytecodes
* that handle normal Tcl values. NOTE that this instruction jumps to
* the foreach_step instruction paired with it; the stack info below
* is only nominal.
* Stack: ... listObjs... => ... listObjs... iterTracker info */
{"foreach_step", 1, 0, 0, {OPERAND_NONE}},
/* "Step" or begin next iteration of foreach loop. Assigns to foreach
* iteration variables. May jump to straight after the foreach_start
* that pushed the iterTracker and info values. MUST be followed
* immediately by a foreach_end.
* Stack: ... listObjs... iterTracker info =>
* ... listObjs... iterTracker info */
{"foreach_end", 1, 0, 0, {OPERAND_NONE}},
/* Clean up a foreach loop by dropping the info value, the tracker
* value and the lists that were being iterated over.
* Stack: ... listObjs... iterTracker info => ... */
{"lmap_collect", 1, -1, 0, {OPERAND_NONE}},
/* Appends the value at the top of the stack to the list located on
* the stack the "other side" of the foreach-related values.
* Stack: ... collector listObjs... iterTracker info value =>
* ... collector listObjs... iterTracker info */
{"strtrim", 1, -1, 0, {OPERAND_NONE}},
/* [string trim] core: removes the characters (designated by the value
* at the top of the stack) from both ends of the string and pushes
* the resulting string.
* Stack: ... string charset => ... trimmedString */
{"strtrimLeft", 1, -1, 0, {OPERAND_NONE}},
/* [string trimleft] core: removes the characters (designated by the
* value at the top of the stack) from the left of the string and
* pushes the resulting string.
* Stack: ... string charset => ... trimmedString */
{"strtrimRight", 1, -1, 0, {OPERAND_NONE}},
/* [string trimright] core: removes the characters (designated by the
* value at the top of the stack) from the right of the string and
* pushes the resulting string.
* Stack: ... string charset => ... trimmedString */
{"concatStk", 5, INT_MIN, 1, {OPERAND_UINT4}},
/* Wrapper round Tcl_ConcatObj(), used for [concat] and [eval]. opnd
* is number of values to concatenate.
* Operation: push concat(stk1 stk2 ... stktop) */
{"strcaseUpper", 1, 0, 0, {OPERAND_NONE}},
/* [string toupper] core: converts whole string to upper case using
* the default (extended "C" locale) rules.
* Stack: ... string => ... newString */
{"strcaseLower", 1, 0, 0, {OPERAND_NONE}},
/* [string tolower] core: converts whole string to upper case using
* the default (extended "C" locale) rules.
* Stack: ... string => ... newString */
{"strcaseTitle", 1, 0, 0, {OPERAND_NONE}},
/* [string totitle] core: converts whole string to upper case using
* the default (extended "C" locale) rules.
* Stack: ... string => ... newString */
{"strreplace", 1, -3, 0, {OPERAND_NONE}},
/* [string replace] core: replaces a non-empty range of one string
* with the contents of another.
* Stack: ... string fromIdx toIdx replacement => ... newString */
{"originCmd", 1, 0, 0, {OPERAND_NONE}},
/* Reports which command was the origin (via namespace import chain)
* of the command named on the top of the stack.
* Stack: ... cmdName => ... fullOriginalCmdName */
{"tclooNext", 2, INT_MIN, 1, {OPERAND_UINT1}},
/* Call the next item on the TclOO call chain, passing opnd arguments
* (min 1, max 255, *includes* "next"). The result of the invoked
* method implementation will be pushed on the stack in place of the
* arguments (similar to invokeStk).
* Stack: ... "next" arg2 arg3 -- argN => ... result */
{"tclooNextClass", 2, INT_MIN, 1, {OPERAND_UINT1}},
/* Call the following item on the TclOO call chain defined by class
* className, passing opnd arguments (min 2, max 255, *includes*
* "nextto" and the class name). The result of the invoked method
* implementation will be pushed on the stack in place of the
* arguments (similar to invokeStk).
* Stack: ... "nextto" className arg3 arg4 -- argN => ... result */
{"yieldToInvoke", 1, 0, 0, {OPERAND_NONE}},
/* Makes the current coroutine yield the value at the top of the
* stack, invoking the given command/args with resolution in the given
* namespace (all packed into a list), and places the list of values
* that are the response back on top of the stack when it resumes.
* Stack: ... [list ns cmd arg1 ... argN] => ... resumeList */
{"numericType", 1, 0, 0, {OPERAND_NONE}},
/* Pushes the numeric type code of the word at the top of the stack.
* Stack: ... value => ... typeCode */
{"tryCvtToBoolean", 1, +1, 0, {OPERAND_NONE}},
/* Try converting stktop to boolean if possible. No errors.
* Stack: ... value => ... value isStrictBool */
{"strclass", 2, 0, 1, {OPERAND_SCLS1}},
/* See if all the characters of the given string are a member of the
* specified (by opnd) character class. Note that an empty string will
* satisfy the class check (standard definition of "all").
* Stack: ... stringValue => ... boolean */
{"lappendList", 5, 0, 1, {OPERAND_LVT4}},
/* Lappend list to scalar variable at op4 in frame.
* Stack: ... list => ... listVarContents */
{"lappendListArray", 5, -1, 1, {OPERAND_LVT4}},
/* Lappend list to array element; array at op4.
* Stack: ... elem list => ... listVarContents */
{"lappendListArrayStk", 1, -2, 0, {OPERAND_NONE}},
/* Lappend list to array element.
* Stack: ... arrayName elem list => ... listVarContents */
{"lappendListStk", 1, -1, 0, {OPERAND_NONE}},
/* Lappend list to general variable.
* Stack: ... varName list => ... listVarContents */
{"clockRead", 2, +1, 1, {OPERAND_UINT1}},
/* Read clock out to the stack. Operand is which clock to read
* 0=clicks, 1=microseconds, 2=milliseconds, 3=seconds.
* Stack: ... => ... time */
{NULL, 0, 0, 0, {OPERAND_NONE}}
};
/*
* Prototypes for procedures defined later in this file:
*/
static ByteCode * CompileSubstObj(Tcl_Interp *interp, Tcl_Obj *objPtr,
int flags);
static void DupByteCodeInternalRep(Tcl_Obj *srcPtr,
Tcl_Obj *copyPtr);
static unsigned char * EncodeCmdLocMap(CompileEnv *envPtr,
ByteCode *codePtr, unsigned char *startPtr);
static void EnterCmdExtentData(CompileEnv *envPtr,
int cmdNumber, int numSrcBytes, int numCodeBytes);
static void EnterCmdStartData(CompileEnv *envPtr,
int cmdNumber, int srcOffset, int codeOffset);
static void FreeByteCodeInternalRep(Tcl_Obj *objPtr);
static void FreeSubstCodeInternalRep(Tcl_Obj *objPtr);
static int GetCmdLocEncodingSize(CompileEnv *envPtr);
static int IsCompactibleCompileEnv(Tcl_Interp *interp,
CompileEnv *envPtr);
#ifdef TCL_COMPILE_STATS
static void RecordByteCodeStats(ByteCode *codePtr);
#endif /* TCL_COMPILE_STATS */
static int SetByteCodeFromAny(Tcl_Interp *interp,
Tcl_Obj *objPtr);
static void StartExpanding(CompileEnv *envPtr);
/*
* TIP #280: Helper for building the per-word line information of all compiled
* commands.
*/
static void EnterCmdWordData(ExtCmdLoc *eclPtr, int srcOffset,
Tcl_Token *tokenPtr, const char *cmd, int len,
int numWords, int line, int *clNext, int **lines,
CompileEnv *envPtr);
static void ReleaseCmdWordData(ExtCmdLoc *eclPtr);
/*
* The structure below defines the bytecode Tcl object type by means of
* procedures that can be invoked by generic object code.
*/
const Tcl_ObjType tclByteCodeType = {
"bytecode", /* name */
FreeByteCodeInternalRep, /* freeIntRepProc */
DupByteCodeInternalRep, /* dupIntRepProc */
NULL, /* updateStringProc */
SetByteCodeFromAny /* setFromAnyProc */
};
/*
* The structure below defines a bytecode Tcl object type to hold the
* compiled bytecode for the [subst]itution of Tcl values.
*/
static const Tcl_ObjType substCodeType = {
"substcode", /* name */
FreeSubstCodeInternalRep, /* freeIntRepProc */
DupByteCodeInternalRep, /* dupIntRepProc - shared with bytecode */
NULL, /* updateStringProc */
NULL, /* setFromAnyProc */
};
/*
* Helper macros.
*/
#define TclIncrUInt4AtPtr(ptr, delta) \
TclStoreInt4AtPtr(TclGetUInt4AtPtr(ptr)+(delta), (ptr));
/*
*----------------------------------------------------------------------
*
* TclSetByteCodeFromAny --
*
* Part of the bytecode Tcl object type implementation. Attempts to
* generate an byte code internal form for the Tcl object "objPtr" by
* compiling its string representation. This function also takes a hook
* procedure that will be invoked to perform any needed post processing
* on the compilation results before generating byte codes. interp is
* compilation context and may not be NULL.
*
* Results:
* The return value is a standard Tcl object result. If an error occurs
* during compilation, an error message is left in the interpreter's
* result.
*
* Side effects:
* Frees the old internal representation. If no error occurs, then the
* compiled code is stored as "objPtr"s bytecode representation. Also, if
* debugging, initializes the "tcl_traceCompile" Tcl variable used to
* trace compilations.
*
*----------------------------------------------------------------------
*/
int
TclSetByteCodeFromAny(
Tcl_Interp *interp, /* The interpreter for which the code is being
* compiled. Must not be NULL. */
Tcl_Obj *objPtr, /* The object to make a ByteCode object. */
CompileHookProc *hookProc, /* Procedure to invoke after compilation. */
ClientData clientData) /* Hook procedure private data. */
{
Interp *iPtr = (Interp *) interp;
CompileEnv compEnv; /* Compilation environment structure allocated
* in frame. */
int length, result = TCL_OK;
const char *stringPtr;
Proc *procPtr = iPtr->compiledProcPtr;
ContLineLoc *clLocPtr;
#ifdef TCL_COMPILE_DEBUG
if (!traceInitialized) {
if (Tcl_LinkVar(interp, "tcl_traceCompile",
(char *) &tclTraceCompile, TCL_LINK_INT) != TCL_OK) {
Tcl_Panic("SetByteCodeFromAny: unable to create link for tcl_traceCompile variable");
}
traceInitialized = 1;
}
#endif
stringPtr = TclGetStringFromObj(objPtr, &length);
/*
* TIP #280: Pick up the CmdFrame in which the BC compiler was invoked and
* use to initialize the tracking in the compiler. This information was
* stored by TclCompEvalObj and ProcCompileProc.
*/
TclInitCompileEnv(interp, &compEnv, stringPtr, length,
iPtr->invokeCmdFramePtr, iPtr->invokeWord);
/*
* Now we check if we have data about invisible continuation lines for the
* script, and make it available to the compile environment, if so.
*
* It is not clear if the script Tcl_Obj* can be free'd while the compiler
* is using it, leading to the release of the associated ContLineLoc
* structure as well. To ensure that the latter doesn't happen we set a
* lock on it. We release this lock in the function TclFreeCompileEnv(),
* found in this file. The "lineCLPtr" hashtable is managed in the file
* "tclObj.c".
*/
clLocPtr = TclContinuationsGet(objPtr);
if (clLocPtr) {
compEnv.clNext = &clLocPtr->loc[0];
}
TclCompileScript(interp, stringPtr, length, &compEnv);
/*
* Successful compilation. Add a "done" instruction at the end.
*/
TclEmitOpcode(INST_DONE, &compEnv);
/*
* Check for optimizations!
*
* Test if the generated code is free of most hazards; if so, recompile
* but with generation of INST_START_CMD disabled. This produces somewhat
* faster code in some cases, and more compact code in more.
*/
if (Tcl_GetParent(interp) == NULL &&
!Tcl_LimitTypeEnabled(interp, TCL_LIMIT_COMMANDS|TCL_LIMIT_TIME)
&& IsCompactibleCompileEnv(interp, &compEnv)) {
TclFreeCompileEnv(&compEnv);
iPtr->compiledProcPtr = procPtr;
TclInitCompileEnv(interp, &compEnv, stringPtr, length,
iPtr->invokeCmdFramePtr, iPtr->invokeWord);
if (clLocPtr) {
compEnv.clNext = &clLocPtr->loc[0];
}
compEnv.atCmdStart = 2; /* The disabling magic. */
TclCompileScript(interp, stringPtr, length, &compEnv);
assert (compEnv.atCmdStart > 1);
TclEmitOpcode(INST_DONE, &compEnv);
assert (compEnv.atCmdStart > 1);
}
/*
* Apply some peephole optimizations that can cross specific/generic
* instruction generator boundaries.
*/
if (iPtr->extra.optimizer) {
(iPtr->extra.optimizer)(&compEnv);
}
/*
* Invoke the compilation hook procedure if one exists.
*/
if (hookProc) {
result = hookProc(interp, &compEnv, clientData);
}
/*
* Change the object into a ByteCode object. Ownership of the literal
* objects and aux data items is given to the ByteCode object.
*/
#ifdef TCL_COMPILE_DEBUG
TclVerifyLocalLiteralTable(&compEnv);
#endif /*TCL_COMPILE_DEBUG*/
if (result == TCL_OK) {
TclInitByteCodeObj(objPtr, &compEnv);
#ifdef TCL_COMPILE_DEBUG
if (tclTraceCompile >= 2) {
TclPrintByteCodeObj(interp, objPtr);
fflush(stdout);
}
#endif /* TCL_COMPILE_DEBUG */
}
TclFreeCompileEnv(&compEnv);
return result;
}
/*
*-----------------------------------------------------------------------
*
* SetByteCodeFromAny --
*
* Part of the bytecode Tcl object type implementation. Attempts to
* generate an byte code internal form for the Tcl object "objPtr" by
* compiling its string representation.
*
* Results:
* The return value is a standard Tcl object result. If an error occurs
* during compilation, an error message is left in the interpreter's
* result unless "interp" is NULL.
*
* Side effects:
* Frees the old internal representation. If no error occurs, then the
* compiled code is stored as "objPtr"s bytecode representation. Also, if
* debugging, initializes the "tcl_traceCompile" Tcl variable used to
* trace compilations.
*
*----------------------------------------------------------------------
*/
static int
SetByteCodeFromAny(
Tcl_Interp *interp, /* The interpreter for which the code is being
* compiled. Must not be NULL. */
Tcl_Obj *objPtr) /* The object to make a ByteCode object. */
{
if (interp == NULL) {
return TCL_ERROR;
}
return TclSetByteCodeFromAny(interp, objPtr, NULL, NULL);
}
/*
*----------------------------------------------------------------------
*
* DupByteCodeInternalRep --
*
* Part of the bytecode Tcl object type implementation. However, it does
* not copy the internal representation of a bytecode Tcl_Obj, but
* instead leaves the new object untyped (with a NULL type pointer).
* Code will be compiled for the new object only if necessary.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
DupByteCodeInternalRep(
Tcl_Obj *srcPtr, /* Object with internal rep to copy. */
Tcl_Obj *copyPtr) /* Object with internal rep to set. */
{
return;
}
/*
*----------------------------------------------------------------------
*
* FreeByteCodeInternalRep --
*
* Part of the bytecode Tcl object type implementation. Frees the storage
* associated with a bytecode object's internal representation unless its
* code is actively being executed.
*
* Results:
* None.
*
* Side effects:
* The bytecode object's internal rep is marked invalid and its code gets
* freed unless the code is actively being executed. In that case the
* cleanup is delayed until the last execution of the code completes.
*
*----------------------------------------------------------------------
*/
static void
FreeByteCodeInternalRep(
Tcl_Obj *objPtr) /* Object whose internal rep to free. */
{
ByteCode *codePtr = objPtr->internalRep.twoPtrValue.ptr1;
objPtr->typePtr = NULL;
if (codePtr->refCount-- <= 1) {
TclCleanupByteCode(codePtr);
}
}
/*
*----------------------------------------------------------------------
*
* TclCleanupByteCode --
*
* This procedure does all the real work of freeing up a bytecode
* object's ByteCode structure. It's called only when the structure's
* reference count becomes zero.
*
* Results:
* None.
*
* Side effects:
* Frees objPtr's bytecode internal representation and sets its type NULL
* Also releases its literals and frees its auxiliary data items.
*
*----------------------------------------------------------------------
*/
void
TclCleanupByteCode(
ByteCode *codePtr) /* Points to the ByteCode to free. */
{
Tcl_Interp *interp = (Tcl_Interp *) *codePtr->interpHandle;
Interp *iPtr = (Interp *) interp;
int numLitObjects = codePtr->numLitObjects;
int numAuxDataItems = codePtr->numAuxDataItems;
Tcl_Obj **objArrayPtr, *objPtr;
const AuxData *auxDataPtr;
int i;
#ifdef TCL_COMPILE_STATS
if (interp != NULL) {
ByteCodeStats *statsPtr;
Tcl_Time destroyTime;
int lifetimeSec, lifetimeMicroSec, log2;
statsPtr = &iPtr->stats;
statsPtr->numByteCodesFreed++;
statsPtr->currentSrcBytes -= (double) codePtr->numSrcBytes;
statsPtr->currentByteCodeBytes -= (double) codePtr->structureSize;
statsPtr->currentInstBytes -= (double) codePtr->numCodeBytes;
statsPtr->currentLitBytes -= (double)
codePtr->numLitObjects * sizeof(Tcl_Obj *);
statsPtr->currentExceptBytes -= (double)
codePtr->numExceptRanges * sizeof(ExceptionRange);
statsPtr->currentAuxBytes -= (double)
codePtr->numAuxDataItems * sizeof(AuxData);
statsPtr->currentCmdMapBytes -= (double) codePtr->numCmdLocBytes;
Tcl_GetTime(&destroyTime);
lifetimeSec = destroyTime.sec - codePtr->createTime.sec;
if (lifetimeSec > 2000) { /* avoid overflow */
lifetimeSec = 2000;
}
lifetimeMicroSec = 1000000 * lifetimeSec +
(destroyTime.usec - codePtr->createTime.usec);
log2 = TclLog2(lifetimeMicroSec);
if (log2 > 31) {
log2 = 31;
}
statsPtr->lifetimeCount[log2]++;
}
#endif /* TCL_COMPILE_STATS */
/*
* A single heap object holds the ByteCode structure and its code, object,
* command location, and auxiliary data arrays. This means we only need to
* 1) decrement the ref counts of the LiteralEntry's in its literal array,
* 2) call the free procs for the auxiliary data items, 3) free the
* localCache if it is unused, and finally 4) free the ByteCode
* structure's heap object.
*
* The case for TCL_BYTECODE_PRECOMPILED (precompiled ByteCodes, like
* those generated from tbcload) is special, as they doesn't make use of
* the global literal table. They instead maintain private references to
* their literals which must be decremented.
*
* In order to insure a proper and efficient cleanup of the literal array
* when it contains non-shared literals [Bug 983660], we also distinguish
* the case of an interpreter being deleted (signaled by interp == NULL).
* Also, as the interp deletion will remove the global literal table
* anyway, we avoid the extra cost of updating it for each literal being
* released.
*/
if (codePtr->flags & TCL_BYTECODE_PRECOMPILED) {
objArrayPtr = codePtr->objArrayPtr;
for (i = 0; i < numLitObjects; i++) {
objPtr = *objArrayPtr;
if (objPtr) {
Tcl_DecrRefCount(objPtr);
}
objArrayPtr++;
}
codePtr->numLitObjects = 0;
} else {
objArrayPtr = codePtr->objArrayPtr;
while (numLitObjects--) {
/* TclReleaseLiteral calls Tcl_DecrRefCount() for us */
TclReleaseLiteral(interp, *objArrayPtr++);
}
}
auxDataPtr = codePtr->auxDataArrayPtr;
for (i = 0; i < numAuxDataItems; i++) {
if (auxDataPtr->type->freeProc != NULL) {
auxDataPtr->type->freeProc(auxDataPtr->clientData);
}
auxDataPtr++;
}
/*
* TIP #280. Release the location data associated with this byte code
* structure, if any. NOTE: The interp we belong to may be gone already,
* and the data with it.
*
* See also tclBasic.c, DeleteInterpProc
*/
if (iPtr) {
Tcl_HashEntry *hePtr = Tcl_FindHashEntry(iPtr->lineBCPtr,
(char *) codePtr);
if (hePtr) {
ReleaseCmdWordData(Tcl_GetHashValue(hePtr));
Tcl_DeleteHashEntry(hePtr);
}
}
if (codePtr->localCachePtr && (--codePtr->localCachePtr->refCount == 0)) {
TclFreeLocalCache(interp, codePtr->localCachePtr);
}
TclHandleRelease(codePtr->interpHandle);
ckfree(codePtr);
}
/*
* ---------------------------------------------------------------------
*
* IsCompactibleCompileEnv --
*
* Checks to see if we may apply some basic compaction optimizations to a
* piece of bytecode. Idempotent.
*
* ---------------------------------------------------------------------
*/
static int
IsCompactibleCompileEnv(
Tcl_Interp *interp,
CompileEnv *envPtr)
{
unsigned char *pc;
int size;
/*
* Special: procedures in the '::tcl' namespace (or its children) are
* considered to be well-behaved and so can have compaction applied even
* if it would otherwise be invalid.
*/
if (envPtr->procPtr != NULL && envPtr->procPtr->cmdPtr != NULL
&& envPtr->procPtr->cmdPtr->nsPtr != NULL) {
Namespace *nsPtr = envPtr->procPtr->cmdPtr->nsPtr;
if (strcmp(nsPtr->fullName, "::tcl") == 0
|| strncmp(nsPtr->fullName, "::tcl::", 7) == 0) {
return 1;
}
}
/*
* Go through and ensure that no operation involved can cause a desired
* change of bytecode sequence during running. This comes down to ensuring
* that there are no mapped variables (due to traces) or calls to external
* commands (traces, [uplevel] trickery). This is actually a very
* conservative check; it turns down a lot of code that is OK in practice.
*/
for (pc = envPtr->codeStart ; pc < envPtr->codeNext ; pc += size) {
switch (*pc) {
/* Invokes */
case INST_INVOKE_STK1:
case INST_INVOKE_STK4:
case INST_INVOKE_EXPANDED:
case INST_INVOKE_REPLACE:
return 0;
/* Runtime evals */
case INST_EVAL_STK:
case INST_EXPR_STK:
case INST_YIELD:
return 0;
/* Upvars */
case INST_UPVAR:
case INST_NSUPVAR:
case INST_VARIABLE:
return 0;
default:
size = tclInstructionTable[*pc].numBytes;
assert (size > 0);
break;
}
}
return 1;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SubstObj --
*
* This function performs the substitutions specified on the given string
* as described in the user documentation for the "subst" Tcl command.
*
* Results:
* A Tcl_Obj* containing the substituted string, or NULL to indicate that
* an error occurred.
*
* Side effects:
* See the user documentation.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
Tcl_SubstObj(
Tcl_Interp *interp, /* Interpreter in which substitution occurs */
Tcl_Obj *objPtr, /* The value to be substituted. */
int flags) /* What substitutions to do. */
{
NRE_callback *rootPtr = TOP_CB(interp);
if (TclNRRunCallbacks(interp, Tcl_NRSubstObj(interp, objPtr, flags),
rootPtr) != TCL_OK) {
return NULL;
}
return Tcl_GetObjResult(interp);
}
/*
*----------------------------------------------------------------------
*
* Tcl_NRSubstObj --
*
* Request substitution of a Tcl value by the NR stack.
*
* Results:
* Returns TCL_OK.
*
* Side effects:
* Compiles objPtr into bytecode that performs the substitutions as
* governed by flags and places callbacks on the NR stack to execute
* the bytecode and store the result in the interp.
*
*----------------------------------------------------------------------
*/
int
Tcl_NRSubstObj(
Tcl_Interp *interp,
Tcl_Obj *objPtr,
int flags)
{
ByteCode *codePtr = CompileSubstObj(interp, objPtr, flags);
/* TODO: Confirm we do not need this. */
/* Tcl_ResetResult(interp); */
return TclNRExecuteByteCode(interp, codePtr);
}
/*
*----------------------------------------------------------------------
*
* CompileSubstObj --
*
* Compile a Tcl value into ByteCode implementing its substitution, as
* governed by flags.
*
* Results:
* A (ByteCode *) is returned pointing to the resulting ByteCode.
* The caller must manage its refCount and arrange for a call to
* TclCleanupByteCode() when the last reference disappears.
*
* Side effects:
* The Tcl_ObjType of objPtr is changed to the "substcode" type, and the
* ByteCode and governing flags value are kept in the internal rep for
* faster operations the next time CompileSubstObj is called on the same
* value.
*
*----------------------------------------------------------------------
*/
static ByteCode *
CompileSubstObj(
Tcl_Interp *interp,
Tcl_Obj *objPtr,
int flags)
{
Interp *iPtr = (Interp *) interp;
ByteCode *codePtr = NULL;
if (objPtr->typePtr == &substCodeType) {
Namespace *nsPtr = iPtr->varFramePtr->nsPtr;
codePtr = objPtr->internalRep.twoPtrValue.ptr1;
if (flags != PTR2INT(objPtr->internalRep.twoPtrValue.ptr2)
|| ((Interp *) *codePtr->interpHandle != iPtr)
|| (codePtr->compileEpoch != iPtr->compileEpoch)
|| (codePtr->nsPtr != nsPtr)
|| (codePtr->nsEpoch != nsPtr->resolverEpoch)
|| (codePtr->localCachePtr !=
iPtr->varFramePtr->localCachePtr)) {
FreeSubstCodeInternalRep(objPtr);
}
}
if (objPtr->typePtr != &substCodeType) {
CompileEnv compEnv;
int numBytes;
const char *bytes = Tcl_GetStringFromObj(objPtr, &numBytes);
/* TODO: Check for more TIP 280 */
TclInitCompileEnv(interp, &compEnv, bytes, numBytes, NULL, 0);
TclSubstCompile(interp, bytes, numBytes, flags, 1, &compEnv);
TclEmitOpcode(INST_DONE, &compEnv);
TclInitByteCodeObj(objPtr, &compEnv);
objPtr->typePtr = &substCodeType;
TclFreeCompileEnv(&compEnv);
codePtr = objPtr->internalRep.twoPtrValue.ptr1;
objPtr->internalRep.twoPtrValue.ptr1 = codePtr;
objPtr->internalRep.twoPtrValue.ptr2 = INT2PTR(flags);
if (iPtr->varFramePtr->localCachePtr) {
codePtr->localCachePtr = iPtr->varFramePtr->localCachePtr;
codePtr->localCachePtr->refCount++;
}
#ifdef TCL_COMPILE_DEBUG
if (tclTraceCompile >= 2) {
TclPrintByteCodeObj(interp, objPtr);
fflush(stdout);
}
#endif /* TCL_COMPILE_DEBUG */
}
return codePtr;
}
/*
*----------------------------------------------------------------------
*
* FreeSubstCodeInternalRep --
*
* Part of the substcode Tcl object type implementation. Frees the
* storage associated with a substcode object's internal representation
* unless its code is actively being executed.
*
* Results:
* None.
*
* Side effects:
* The substcode object's internal rep is marked invalid and its code
* gets freed unless the code is actively being executed. In that case
* the cleanup is delayed until the last execution of the code completes.
*
*----------------------------------------------------------------------
*/
static void
FreeSubstCodeInternalRep(
Tcl_Obj *objPtr) /* Object whose internal rep to free. */
{
ByteCode *codePtr = objPtr->internalRep.twoPtrValue.ptr1;
objPtr->typePtr = NULL;
if (codePtr->refCount-- <= 1) {
TclCleanupByteCode(codePtr);
}
}
static void
ReleaseCmdWordData(
ExtCmdLoc *eclPtr)
{
int i;
if (eclPtr->type == TCL_LOCATION_SOURCE) {
Tcl_DecrRefCount(eclPtr->path);
}
for (i=0 ; i<eclPtr->nuloc ; i++) {
ckfree((char *) eclPtr->loc[i].line);
}
if (eclPtr->loc != NULL) {
ckfree((char *) eclPtr->loc);
}
ckfree((char *) eclPtr);
}
/*
*----------------------------------------------------------------------
*
* TclInitCompileEnv --
*
* Initializes a CompileEnv compilation environment structure for the
* compilation of a string in an interpreter.
*
* Results:
* None.
*
* Side effects:
* The CompileEnv structure is initialized.
*
*----------------------------------------------------------------------
*/
void
TclInitCompileEnv(
Tcl_Interp *interp, /* The interpreter for which a CompileEnv
* structure is initialized. */
CompileEnv *envPtr,/* Points to the CompileEnv structure to
* initialize. */
const char *stringPtr, /* The source string to be compiled. */
int numBytes, /* Number of bytes in source string. */
const CmdFrame *invoker, /* Location context invoking the bcc */
int word) /* Index of the word in that context getting
* compiled */
{
Interp *iPtr = (Interp *) interp;
assert(tclInstructionTable[LAST_INST_OPCODE+1].name == NULL);
envPtr->iPtr = iPtr;
envPtr->source = stringPtr;
envPtr->numSrcBytes = numBytes;
envPtr->procPtr = iPtr->compiledProcPtr;
iPtr->compiledProcPtr = NULL;
envPtr->numCommands = 0;
envPtr->exceptDepth = 0;
envPtr->maxExceptDepth = 0;
envPtr->maxStackDepth = 0;
envPtr->currStackDepth = 0;
TclInitLiteralTable(&envPtr->localLitTable);
envPtr->codeStart = envPtr->staticCodeSpace;
envPtr->codeNext = envPtr->codeStart;
envPtr->codeEnd = envPtr->codeStart + COMPILEENV_INIT_CODE_BYTES;
envPtr->mallocedCodeArray = 0;
envPtr->literalArrayPtr = envPtr->staticLiteralSpace;
envPtr->literalArrayNext = 0;
envPtr->literalArrayEnd = COMPILEENV_INIT_NUM_OBJECTS;
envPtr->mallocedLiteralArray = 0;
envPtr->exceptArrayPtr = envPtr->staticExceptArraySpace;
envPtr->exceptAuxArrayPtr = envPtr->staticExAuxArraySpace;
envPtr->exceptArrayNext = 0;
envPtr->exceptArrayEnd = COMPILEENV_INIT_EXCEPT_RANGES;
envPtr->mallocedExceptArray = 0;
envPtr->cmdMapPtr = envPtr->staticCmdMapSpace;
envPtr->cmdMapEnd = COMPILEENV_INIT_CMD_MAP_SIZE;
envPtr->mallocedCmdMap = 0;
envPtr->atCmdStart = 1;
envPtr->expandCount = 0;
/*
* TIP #280: Set up the extended command location information, based on
* the context invoking the byte code compiler. This structure is used to
* keep the per-word line information for all compiled commands.
*
* See also tclBasic.c, TclEvalObjEx, for the equivalent code in the
* non-compiling evaluator
*/
envPtr->extCmdMapPtr = ckalloc(sizeof(ExtCmdLoc));
envPtr->extCmdMapPtr->loc = NULL;
envPtr->extCmdMapPtr->nloc = 0;
envPtr->extCmdMapPtr->nuloc = 0;
envPtr->extCmdMapPtr->path = NULL;
if (invoker == NULL) {
/*
* Initialize the compiler for relative counting in case of a
* dynamic context.
*/
envPtr->line = 1;
if (iPtr->evalFlags & TCL_EVAL_FILE) {
iPtr->evalFlags &= ~TCL_EVAL_FILE;
envPtr->extCmdMapPtr->type = TCL_LOCATION_SOURCE;
if (iPtr->scriptFile) {
/*
* Normalization here, to have the correct pwd. Should have
* negligible impact on performance, as the norm should have
* been done already by the 'source' invoking us, and it
* caches the result.
*/
Tcl_Obj *norm =
Tcl_FSGetNormalizedPath(interp, iPtr->scriptFile);
if (norm == NULL) {
/*
* Error message in the interp result. No place to put it.
* And no place to serve the error itself to either. Fake
* a path, empty string.
*/
TclNewLiteralStringObj(envPtr->extCmdMapPtr->path, "");
} else {
envPtr->extCmdMapPtr->path = norm;
}
} else {
TclNewLiteralStringObj(envPtr->extCmdMapPtr->path, "");
}
Tcl_IncrRefCount(envPtr->extCmdMapPtr->path);
} else {
envPtr->extCmdMapPtr->type =
(envPtr->procPtr ? TCL_LOCATION_PROC : TCL_LOCATION_BC);
}
} else {
/*
* Initialize the compiler using the context, making counting absolute
* to that context. Note that the context can be byte code execution.
* In that case we have to fill out the missing pieces (line, path,
* ...) which may make change the type as well.
*/
CmdFrame *ctxPtr = TclStackAlloc(interp, sizeof(CmdFrame));
int pc = 0;
*ctxPtr = *invoker;
if (invoker->type == TCL_LOCATION_BC) {
/*
* Note: Type BC => ctx.data.eval.path is not used.
* ctx.data.tebc.codePtr is used instead.
*/
TclGetSrcInfoForPc(ctxPtr);
pc = 1;
}
if ((ctxPtr->nline <= word) || (ctxPtr->line[word] < 0)) {
/*
* Word is not a literal, relative counting.
*/
envPtr->line = 1;
envPtr->extCmdMapPtr->type =
(envPtr->procPtr ? TCL_LOCATION_PROC : TCL_LOCATION_BC);
if (pc && (ctxPtr->type == TCL_LOCATION_SOURCE)) {
/*
* The reference made by 'TclGetSrcInfoForPc' is dead.
*/
Tcl_DecrRefCount(ctxPtr->data.eval.path);
}
} else {
envPtr->line = ctxPtr->line[word];
envPtr->extCmdMapPtr->type = ctxPtr->type;
if (ctxPtr->type == TCL_LOCATION_SOURCE) {
envPtr->extCmdMapPtr->path = ctxPtr->data.eval.path;
if (pc) {
/*
* The reference 'TclGetSrcInfoForPc' made is transfered.
*/
ctxPtr->data.eval.path = NULL;
} else {
/*
* We have a new reference here.
*/
Tcl_IncrRefCount(envPtr->extCmdMapPtr->path);
}
}
}
TclStackFree(interp, ctxPtr);
}
envPtr->extCmdMapPtr->start = envPtr->line;
/*
* Initialize the data about invisible continuation lines as empty, i.e.
* not used. The caller (TclSetByteCodeFromAny) will set this up, if such
* data is available.
*/
envPtr->clNext = NULL;
envPtr->auxDataArrayPtr = envPtr->staticAuxDataArraySpace;
envPtr->auxDataArrayNext = 0;
envPtr->auxDataArrayEnd = COMPILEENV_INIT_AUX_DATA_SIZE;
envPtr->mallocedAuxDataArray = 0;
}
/*
*----------------------------------------------------------------------
*
* TclFreeCompileEnv --
*
* Free the storage allocated in a CompileEnv compilation environment
* structure.
*
* Results:
* None.
*
* Side effects:
* Allocated storage in the CompileEnv structure is freed. Note that its
* local literal table is not deleted and its literal objects are not
* released. In addition, storage referenced by its auxiliary data items
* is not freed. This is done so that, when compilation is successful,
* "ownership" of these objects and aux data items is handed over to the
* corresponding ByteCode structure.
*
*----------------------------------------------------------------------
*/
void
TclFreeCompileEnv(
CompileEnv *envPtr)/* Points to the CompileEnv structure. */
{
if (envPtr->localLitTable.buckets != envPtr->localLitTable.staticBuckets){
ckfree(envPtr->localLitTable.buckets);
envPtr->localLitTable.buckets = envPtr->localLitTable.staticBuckets;
}
if (envPtr->iPtr) {
/*
* We never converted to Bytecode, so free the things we would
* have transferred to it.
*/
int i;
LiteralEntry *entryPtr = envPtr->literalArrayPtr;
AuxData *auxDataPtr = envPtr->auxDataArrayPtr;
for (i = 0; i < envPtr->literalArrayNext; i++) {
TclReleaseLiteral((Tcl_Interp *)envPtr->iPtr, entryPtr->objPtr);
entryPtr++;
}
#ifdef TCL_COMPILE_DEBUG
TclVerifyGlobalLiteralTable(envPtr->iPtr);
#endif /*TCL_COMPILE_DEBUG*/
for (i = 0; i < envPtr->auxDataArrayNext; i++) {
if (auxDataPtr->type->freeProc != NULL) {
auxDataPtr->type->freeProc(auxDataPtr->clientData);
}
auxDataPtr++;
}
}
if (envPtr->mallocedCodeArray) {
ckfree(envPtr->codeStart);
}
if (envPtr->mallocedLiteralArray) {
ckfree(envPtr->literalArrayPtr);
}
if (envPtr->mallocedExceptArray) {
ckfree(envPtr->exceptArrayPtr);
ckfree(envPtr->exceptAuxArrayPtr);
}
if (envPtr->mallocedCmdMap) {
ckfree(envPtr->cmdMapPtr);
}
if (envPtr->mallocedAuxDataArray) {
ckfree(envPtr->auxDataArrayPtr);
}
if (envPtr->extCmdMapPtr) {
ReleaseCmdWordData(envPtr->extCmdMapPtr);
envPtr->extCmdMapPtr = NULL;
}
}
/*
*----------------------------------------------------------------------
*
* TclWordKnownAtCompileTime --
*
* Test whether the value of a token is completely known at compile time.
*
* Results:
* Returns true if the tokenPtr argument points to a word value that is
* completely known at compile time. Generally, values that are known at
* compile time can be compiled to their values, while values that cannot
* be known until substitution at runtime must be compiled to bytecode
* instructions that perform that substitution. For several commands,
* whether or not arguments are known at compile time determine whether
* it is worthwhile to compile at all.
*
* Side effects:
* When returning true, appends the known value of the word to the
* unshared Tcl_Obj (*valuePtr), unless valuePtr is NULL.
*
*----------------------------------------------------------------------
*/
int
TclWordKnownAtCompileTime(
Tcl_Token *tokenPtr, /* Points to Tcl_Token we should check */
Tcl_Obj *valuePtr) /* If not NULL, points to an unshared Tcl_Obj
* to which we should append the known value
* of the word. */
{
int numComponents = tokenPtr->numComponents;
Tcl_Obj *tempPtr = NULL;
if (tokenPtr->type == TCL_TOKEN_SIMPLE_WORD) {
if (valuePtr != NULL) {
Tcl_AppendToObj(valuePtr, tokenPtr[1].start, tokenPtr[1].size);
}
return 1;
}
if (tokenPtr->type != TCL_TOKEN_WORD) {
return 0;
}
tokenPtr++;
if (valuePtr != NULL) {
tempPtr = Tcl_NewObj();
Tcl_IncrRefCount(tempPtr);
}
while (numComponents--) {
switch (tokenPtr->type) {
case TCL_TOKEN_TEXT:
if (tempPtr != NULL) {
Tcl_AppendToObj(tempPtr, tokenPtr->start, tokenPtr->size);
}
break;
case TCL_TOKEN_BS:
if (tempPtr != NULL) {
char utfBuf[TCL_UTF_MAX] = "";
int length = TclParseBackslash(tokenPtr->start,
tokenPtr->size, NULL, utfBuf);
Tcl_AppendToObj(tempPtr, utfBuf, length);
}
break;
default:
if (tempPtr != NULL) {
Tcl_DecrRefCount(tempPtr);
}
return 0;
}
tokenPtr++;
}
if (valuePtr != NULL) {
Tcl_AppendObjToObj(valuePtr, tempPtr);
Tcl_DecrRefCount(tempPtr);
}
return 1;
}
/*
*----------------------------------------------------------------------
*
* TclCompileScript --
*
* Compile a Tcl script in a string.
*
* Results:
* The return value is TCL_OK on a successful compilation and TCL_ERROR
* on failure. If TCL_ERROR is returned, then the interpreter's result
* contains an error message.
*
* Side effects:
* Adds instructions to envPtr to evaluate the script at runtime.
*
*----------------------------------------------------------------------
*/
static int
ExpandRequested(
Tcl_Token *tokenPtr,
int numWords)
{
/* Determine whether any words of the command require expansion */
while (numWords--) {
if (tokenPtr->type == TCL_TOKEN_EXPAND_WORD) {
return 1;
}
tokenPtr = TokenAfter(tokenPtr);
}
return 0;
}
static void
CompileCmdLiteral(
Tcl_Interp *interp,
Tcl_Obj *cmdObj,
CompileEnv *envPtr)
{
int numBytes;
const char *bytes;
Command *cmdPtr;
int cmdLitIdx, extraLiteralFlags = LITERAL_CMD_NAME;
cmdPtr = (Command *) Tcl_GetCommandFromObj(interp, cmdObj);
if ((cmdPtr != NULL) && (cmdPtr->flags & CMD_VIA_RESOLVER)) {
extraLiteralFlags |= LITERAL_UNSHARED;
}
bytes = Tcl_GetStringFromObj(cmdObj, &numBytes);
cmdLitIdx = TclRegisterLiteral(envPtr, (char *)bytes, numBytes, extraLiteralFlags);
if (cmdPtr) {
TclSetCmdNameObj(interp, TclFetchLiteral(envPtr, cmdLitIdx), cmdPtr);
}
TclEmitPush(cmdLitIdx, envPtr);
}
void
TclCompileInvocation(
Tcl_Interp *interp,
Tcl_Token *tokenPtr,
Tcl_Obj *cmdObj,
int numWords,
CompileEnv *envPtr)
{
DefineLineInformation;
int wordIdx = 0, depth = TclGetStackDepth(envPtr);
if (cmdObj) {
CompileCmdLiteral(interp, cmdObj, envPtr);
wordIdx = 1;
tokenPtr = TokenAfter(tokenPtr);
}
for (; wordIdx < numWords; wordIdx++, tokenPtr = TokenAfter(tokenPtr)) {
int objIdx;
SetLineInformation(wordIdx);
if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) {
CompileTokens(envPtr, tokenPtr, interp);
continue;
}
objIdx = TclRegisterNewLiteral(envPtr,
tokenPtr[1].start, tokenPtr[1].size);
if (envPtr->clNext) {
TclContinuationsEnterDerived(TclFetchLiteral(envPtr, objIdx),
tokenPtr[1].start - envPtr->source, envPtr->clNext);
}
TclEmitPush(objIdx, envPtr);
}
if (wordIdx <= 255) {
TclEmitInvoke(envPtr, INST_INVOKE_STK1, wordIdx);
} else {
TclEmitInvoke(envPtr, INST_INVOKE_STK4, wordIdx);
}
TclCheckStackDepth(depth+1, envPtr);
}
static void
CompileExpanded(
Tcl_Interp *interp,
Tcl_Token *tokenPtr,
Tcl_Obj *cmdObj,
int numWords,
CompileEnv *envPtr)
{
DefineLineInformation;
int wordIdx = 0;
int depth = TclGetStackDepth(envPtr);
StartExpanding(envPtr);
if (cmdObj) {
CompileCmdLiteral(interp, cmdObj, envPtr);
wordIdx = 1;
tokenPtr = TokenAfter(tokenPtr);
}
for (; wordIdx < numWords; wordIdx++, tokenPtr = TokenAfter(tokenPtr)) {
int objIdx;
SetLineInformation(wordIdx);
if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) {
CompileTokens(envPtr, tokenPtr, interp);
if (tokenPtr->type == TCL_TOKEN_EXPAND_WORD) {
TclEmitInstInt4(INST_EXPAND_STKTOP,
envPtr->currStackDepth, envPtr);
}
continue;
}
objIdx = TclRegisterNewLiteral(envPtr,
tokenPtr[1].start, tokenPtr[1].size);
if (envPtr->clNext) {
TclContinuationsEnterDerived(TclFetchLiteral(envPtr, objIdx),
tokenPtr[1].start - envPtr->source, envPtr->clNext);
}
TclEmitPush(objIdx, envPtr);
}
/*
* The stack depth during argument expansion can only be managed at
* runtime, as the number of elements in the expanded lists is not known
* at compile time. We adjust here the stack depth estimate so that it is
* correct after the command with expanded arguments returns.
*
* The end effect of this command's invocation is that all the words of
* the command are popped from the stack, and the result is pushed: the
* stack top changes by (1-wordIdx).
*
* Note that the estimates are not correct while the command is being
* prepared and run, INST_EXPAND_STKTOP is not stack-neutral in general.
*/
TclEmitInvoke(envPtr, INST_INVOKE_EXPANDED, wordIdx);
TclCheckStackDepth(depth+1, envPtr);
}
static int
CompileCmdCompileProc(
Tcl_Interp *interp,
Tcl_Parse *parsePtr,
Command *cmdPtr,
CompileEnv *envPtr)
{
DefineLineInformation;
int unwind = 0, incrOffset = -1;
int depth = TclGetStackDepth(envPtr);
/*
* Emit of the INST_START_CMD instruction is controlled by the value of
* envPtr->atCmdStart:
*
* atCmdStart == 2 : We are not using the INST_START_CMD instruction.
* atCmdStart == 1 : INST_START_CMD was the last instruction emitted.
* : We do not need to emit another. Instead we
* : increment the number of cmds started at it (except
* : for the special case at the start of a script.)
* atCmdStart == 0 : The last instruction was something else. We need
* : to emit INST_START_CMD here.
*/
switch (envPtr->atCmdStart) {
case 0:
unwind = tclInstructionTable[INST_START_CMD].numBytes;
TclEmitInstInt4(INST_START_CMD, 0, envPtr);
incrOffset = envPtr->codeNext - envPtr->codeStart;
TclEmitInt4(0, envPtr);
break;
case 1:
if (envPtr->codeNext > envPtr->codeStart) {
incrOffset = envPtr->codeNext - 4 - envPtr->codeStart;
}
break;
case 2:
/* Nothing to do */
;
}
if (TCL_OK == TclAttemptCompileProc(interp, parsePtr, 1, cmdPtr, envPtr)) {
if (incrOffset >= 0) {
/*
* We successfully compiled a command. Increment the number of
* commands that start at the currently active INST_START_CMD.
*/
unsigned char *incrPtr = envPtr->codeStart + incrOffset;
unsigned char *startPtr = incrPtr - 5;
TclIncrUInt4AtPtr(incrPtr, 1);
if (unwind) {
/* We started the INST_START_CMD. Record the code length. */
TclStoreInt4AtPtr(envPtr->codeNext - startPtr, startPtr + 1);
}
}
TclCheckStackDepth(depth+1, envPtr);
return TCL_OK;
}
envPtr->codeNext -= unwind; /* Unwind INST_START_CMD */
/*
* Throw out any line information generated by the failed compile attempt.
*/
while (mapPtr->nuloc - 1 > eclIndex) {
mapPtr->nuloc--;
ckfree(mapPtr->loc[mapPtr->nuloc].line);
mapPtr->loc[mapPtr->nuloc].line = NULL;
}
/*
* Reset the index of next command. Toss out any from failed nested
* partial compiles.
*/
envPtr->numCommands = mapPtr->nuloc;
return TCL_ERROR;
}
static int
CompileCommandTokens(
Tcl_Interp *interp,
Tcl_Parse *parsePtr,
CompileEnv *envPtr)
{
Interp *iPtr = (Interp *) interp;
Tcl_Token *tokenPtr = parsePtr->tokenPtr;
ExtCmdLoc *eclPtr = envPtr->extCmdMapPtr;
Tcl_Obj *cmdObj = Tcl_NewObj();
Command *cmdPtr = NULL;
int code = TCL_ERROR;
int cmdKnown, expand = -1;
int *wlines, wlineat;
int cmdLine = envPtr->line;
int *clNext = envPtr->clNext;
int cmdIdx = envPtr->numCommands;
int startCodeOffset = envPtr->codeNext - envPtr->codeStart;
int depth = TclGetStackDepth(envPtr);
assert (parsePtr->numWords > 0);
/* Pre-Compile */
envPtr->numCommands++;
EnterCmdStartData(envPtr, cmdIdx,
parsePtr->commandStart - envPtr->source, startCodeOffset);
/*
* TIP #280. Scan the words and compute the extended location information.
* The map first contain full per-word line information for use by the
* compiler. This is later replaced by a reduced form which signals
* non-literal words, stored in 'wlines'.
*/
EnterCmdWordData(eclPtr, parsePtr->commandStart - envPtr->source,
parsePtr->tokenPtr, parsePtr->commandStart,
parsePtr->commandSize, parsePtr->numWords, cmdLine,
clNext, &wlines, envPtr);
wlineat = eclPtr->nuloc - 1;
envPtr->line = eclPtr->loc[wlineat].line[0];
envPtr->clNext = eclPtr->loc[wlineat].next[0];
/* Do we know the command word? */
Tcl_IncrRefCount(cmdObj);
tokenPtr = parsePtr->tokenPtr;
cmdKnown = TclWordKnownAtCompileTime(tokenPtr, cmdObj);
/* Is this a command we should (try to) compile with a compileProc ? */
if (cmdKnown && !(iPtr->flags & DONT_COMPILE_CMDS_INLINE)) {
cmdPtr = (Command *) Tcl_GetCommandFromObj(interp, cmdObj);
if (cmdPtr) {
/*
* Found a command. Test the ways we can be told not to attempt
* to compile it.
*/
if ((cmdPtr->compileProc == NULL)
|| (cmdPtr->nsPtr->flags & NS_SUPPRESS_COMPILATION)
|| (cmdPtr->flags & CMD_HAS_EXEC_TRACES)) {
cmdPtr = NULL;
}
}
if (cmdPtr && !(cmdPtr->flags & CMD_COMPILES_EXPANDED)) {
expand = ExpandRequested(parsePtr->tokenPtr, parsePtr->numWords);
if (expand) {
/* We need to expand, but compileProc cannot. */
cmdPtr = NULL;
}
}
}
/* If cmdPtr != NULL, we will try to call cmdPtr->compileProc */
if (cmdPtr) {
code = CompileCmdCompileProc(interp, parsePtr, cmdPtr, envPtr);
}
if (code == TCL_ERROR) {
if (expand < 0) {
expand = ExpandRequested(parsePtr->tokenPtr, parsePtr->numWords);
}
if (expand) {
CompileExpanded(interp, parsePtr->tokenPtr,
cmdKnown ? cmdObj : NULL, parsePtr->numWords, envPtr);
} else {
TclCompileInvocation(interp, parsePtr->tokenPtr,
cmdKnown ? cmdObj : NULL, parsePtr->numWords, envPtr);
}
}
Tcl_DecrRefCount(cmdObj);
TclEmitOpcode(INST_POP, envPtr);
EnterCmdExtentData(envPtr, cmdIdx,
parsePtr->term - parsePtr->commandStart,
(envPtr->codeNext-envPtr->codeStart) - startCodeOffset);
/*
* TIP #280: Free full form of per-word line data and insert the reduced
* form now
*/
envPtr->line = cmdLine;
envPtr->clNext = clNext;
ckfree(eclPtr->loc[wlineat].line);
ckfree(eclPtr->loc[wlineat].next);
eclPtr->loc[wlineat].line = wlines;
eclPtr->loc[wlineat].next = NULL;
TclCheckStackDepth(depth, envPtr);
return cmdIdx;
}
void
TclCompileScript(
Tcl_Interp *interp, /* Used for error and status reporting. Also
* serves as context for finding and compiling
* commands. May not be NULL. */
const char *script, /* The source script to compile. */
int numBytes, /* Number of bytes in script. If < 0, the
* script consists of all bytes up to the
* first null character. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
int lastCmdIdx = -1; /* Index into envPtr->cmdMapPtr of the last
* command this routine compiles into bytecode.
* Initial value of -1 indicates this routine
* has not yet generated any bytecode. */
const char *p = script; /* Where we are in our compile. */
int depth = TclGetStackDepth(envPtr);
Interp *iPtr = (Interp *) interp;
if (envPtr->iPtr == NULL) {
Tcl_Panic("TclCompileScript() called on uninitialized CompileEnv");
}
/*
* Check depth to avoid overflow of the C execution stack by too many
* nested calls of TclCompileScript (considering interp recursionlimit).
* Factor 5/4 (1.25) is used to avoid too mistaken limit recognition
* during "mixed" evaluation and compilation process (nested eval+compile)
* and is good enough for default recursionlimit (1000).
*/
if (iPtr->numLevels / 5 > iPtr->maxNestingDepth / 4) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"too many nested compilations (infinite loop?)", -1));
Tcl_SetErrorCode(interp, "TCL", "LIMIT", "STACK", NULL);
TclCompileSyntaxError(interp, envPtr);
return;
}
/* Each iteration compiles one command from the script. */
if (numBytes > 0) {
/*
* Don't use system stack (size of Tcl_Parse is ca. 400 bytes), so
* many nested compilations (body enclosed in body) can cause abnormal
* program termination with a stack overflow exception, bug [fec0c17d39].
*/
Tcl_Parse *parsePtr = ckalloc(sizeof(Tcl_Parse));
do {
const char *next;
if (TCL_OK != Tcl_ParseCommand(interp, p, numBytes, 0, parsePtr)) {
/*
* Compile bytecodes to report the parsePtr error at runtime.
*/
Tcl_LogCommandInfo(interp, script, parsePtr->commandStart,
parsePtr->term + 1 - parsePtr->commandStart);
TclCompileSyntaxError(interp, envPtr);
ckfree(parsePtr);
return;
}
#ifdef TCL_COMPILE_DEBUG
/*
* If tracing, print a line for each top level command compiled.
* TODO: Suppress when numWords == 0 ?
*/
if ((tclTraceCompile >= 1) && (envPtr->procPtr == NULL)) {
int commandLength = parsePtr->term - parsePtr->commandStart;
fprintf(stdout, " Compiling: ");
TclPrintSource(stdout, parsePtr->commandStart,
TclMin(commandLength, 55));
fprintf(stdout, "\n");
}
#endif
/*
* TIP #280: Count newlines before the command start.
* (See test info-30.33).
*/
TclAdvanceLines(&envPtr->line, p, parsePtr->commandStart);
TclAdvanceContinuations(&envPtr->line, &envPtr->clNext,
parsePtr->commandStart - envPtr->source);
/*
* Advance parser to the next command in the script.
*/
next = parsePtr->commandStart + parsePtr->commandSize;
numBytes -= next - p;
p = next;
if (parsePtr->numWords == 0) {
/*
* The "command" parsed has no words. In this case we can skip
* the rest of the loop body. With no words, clearly
* CompileCommandTokens() has nothing to do. Since the parser
* aggressively sucks up leading comment and white space,
* including newlines, parsePtr->commandStart must be pointing at
* either the end of script, or a command-terminating semi-colon.
* In either case, the TclAdvance*() calls have nothing to do.
* Finally, when no words are parsed, no tokens have been
* allocated at parsePtr->tokenPtr so there's also nothing for
* Tcl_FreeParse() to do.
*
* The advantage of this shortcut is that CompileCommandTokens()
* can be written with an assumption that parsePtr->numWords > 0, with
* the implication the CCT() always generates bytecode.
*/
continue;
}
/*
* Avoid stack exhaustion by too many nested calls of TclCompileScript
* (considering interp recursionlimit).
*/
iPtr->numLevels++;
lastCmdIdx = CompileCommandTokens(interp, parsePtr, envPtr);
iPtr->numLevels--;
/*
* TIP #280: Track lines in the just compiled command.
*/
TclAdvanceLines(&envPtr->line, parsePtr->commandStart, p);
TclAdvanceContinuations(&envPtr->line, &envPtr->clNext,
p - envPtr->source);
Tcl_FreeParse(parsePtr);
} while (numBytes > 0);
ckfree(parsePtr);
}
if (lastCmdIdx == -1) {
/*
* Compiling the script yielded no bytecode. The script must be all
* whitespace, comments, and empty commands. Such scripts are defined
* to successfully produce the empty string result, so we emit the
* simple bytecode that makes that happen.
*/
PushStringLiteral(envPtr, "");
} else {
/*
* We compiled at least one command to bytecode. The routine
* CompileCommandTokens() follows the bytecode of each compiled
* command with an INST_POP, so that stack balance is maintained when
* several commands are in sequence. (The result of each command is
* thrown away before moving on to the next command). For the last
* command compiled, we need to undo that INST_POP so that the result
* of the last command becomes the result of the script. The code
* here removes that trailing INST_POP.
*/
envPtr->cmdMapPtr[lastCmdIdx].numCodeBytes--;
envPtr->codeNext--;
envPtr->currStackDepth++;
}
TclCheckStackDepth(depth+1, envPtr);
}
/*
*----------------------------------------------------------------------
*
* TclCompileTokens --
*
* Given an array of tokens parsed from a Tcl command (e.g., the tokens
* that make up a word) this procedure emits instructions to evaluate the
* tokens and concatenate their values to form a single result value on
* the interpreter's runtime evaluation stack.
*
* Results:
* The return value is a standard Tcl result. If an error occurs, an
* error message is left in the interpreter's result.
*
* Side effects:
* Instructions are added to envPtr to push and evaluate the tokens at
* runtime.
*
*----------------------------------------------------------------------
*/
void
TclCompileVarSubst(
Tcl_Interp *interp,
Tcl_Token *tokenPtr,
CompileEnv *envPtr)
{
const char *p, *name = tokenPtr[1].start;
int nameBytes = tokenPtr[1].size;
int i, localVar, localVarName = 1;
/*
* Determine how the variable name should be handled: if it contains any
* namespace qualifiers it is not a local variable (localVarName=-1); if
* it looks like an array element and the token has a single component, it
* should not be created here [Bug 569438] (localVarName=0); otherwise,
* the local variable can safely be created (localVarName=1).
*/
for (i = 0, p = name; i < nameBytes; i++, p++) {
if ((*p == ':') && (i < nameBytes-1) && (*(p+1) == ':')) {
localVarName = -1;
break;
} else if ((*p == '(')
&& (tokenPtr->numComponents == 1)
&& (*(name + nameBytes - 1) == ')')) {
localVarName = 0;
break;
}
}
/*
* Either push the variable's name, or find its index in the array
* of local variables in a procedure frame.
*/
localVar = -1;
if (localVarName != -1) {
localVar = TclFindCompiledLocal(name, nameBytes, localVarName, envPtr);
}
if (localVar < 0) {
PushLiteral(envPtr, name, nameBytes);
}
/*
* Emit instructions to load the variable.
*/
TclAdvanceLines(&envPtr->line, tokenPtr[1].start,
tokenPtr[1].start + tokenPtr[1].size);
if (tokenPtr->numComponents == 1) {
if (localVar < 0) {
TclEmitOpcode(INST_LOAD_STK, envPtr);
} else if (localVar <= 255) {
TclEmitInstInt1(INST_LOAD_SCALAR1, localVar, envPtr);
} else {
TclEmitInstInt4(INST_LOAD_SCALAR4, localVar, envPtr);
}
} else {
TclCompileTokens(interp, tokenPtr+2, tokenPtr->numComponents-1, envPtr);
if (localVar < 0) {
TclEmitOpcode(INST_LOAD_ARRAY_STK, envPtr);
} else if (localVar <= 255) {
TclEmitInstInt1(INST_LOAD_ARRAY1, localVar, envPtr);
} else {
TclEmitInstInt4(INST_LOAD_ARRAY4, localVar, envPtr);
}
}
}
void
TclCompileTokens(
Tcl_Interp *interp, /* Used for error and status reporting. */
Tcl_Token *tokenPtr, /* Pointer to first in an array of tokens to
* compile. */
int count, /* Number of tokens to consider at tokenPtr.
* Must be at least 1. */
CompileEnv *envPtr) /* Holds the resulting instructions. */
{
Tcl_DString textBuffer; /* Holds concatenated chars from adjacent
* TCL_TOKEN_TEXT, TCL_TOKEN_BS tokens. */
char buffer[TCL_UTF_MAX] = "";
int i, numObjsToConcat, length, adjust;
unsigned char *entryCodeNext = envPtr->codeNext;
#define NUM_STATIC_POS 20
int isLiteral, maxNumCL, numCL;
int *clPosition = NULL;
int depth = TclGetStackDepth(envPtr);
/*
* For the handling of continuation lines in literals we first check if
* this is actually a literal. For if not we can forego the additional
* processing. Otherwise we pre-allocate a small table to store the
* locations of all continuation lines we find in this literal, if any.
* The table is extended if needed.
*
* Note: Different to the equivalent code in function 'TclSubstTokens()'
* (see file "tclParse.c") we do not seem to need the 'adjust' variable.
* We also do not seem to need code which merges continuation line
* information of multiple words which concat'd at runtime. Either that or
* I have not managed to find a test case for these two possibilities yet.
* It might be a difference between compile- versus run-time processing.
*/
numCL = 0;
maxNumCL = 0;
isLiteral = 1;
for (i=0 ; i < count; i++) {
if ((tokenPtr[i].type != TCL_TOKEN_TEXT)
&& (tokenPtr[i].type != TCL_TOKEN_BS)) {
isLiteral = 0;
break;
}
}
if (isLiteral) {
maxNumCL = NUM_STATIC_POS;
clPosition = ckalloc(maxNumCL * sizeof(int));
}
adjust = 0;
Tcl_DStringInit(&textBuffer);
numObjsToConcat = 0;
for ( ; count > 0; count--, tokenPtr++) {
switch (tokenPtr->type) {
case TCL_TOKEN_TEXT:
TclDStringAppendToken(&textBuffer, tokenPtr);
TclAdvanceLines(&envPtr->line, tokenPtr->start,
tokenPtr->start + tokenPtr->size);
break;
case TCL_TOKEN_BS:
length = TclParseBackslash(tokenPtr->start, tokenPtr->size,
NULL, buffer);
Tcl_DStringAppend(&textBuffer, buffer, length);
/*
* If the backslash sequence we found is in a literal, and
* represented a continuation line, we compute and store its
* location (as char offset to the beginning of the _result_
* script). We may have to extend the table of locations.
*
* Note that the continuation line information is relevant even if
* the word we are processing is not a literal, as it can affect
* nested commands. See the branch for TCL_TOKEN_COMMAND below,
* where the adjustment we are tracking here is taken into
* account. The good thing is that we do not need a table of
* everything, just the number of lines we have to add as
* correction.
*/
if ((length == 1) && (buffer[0] == ' ') &&
(tokenPtr->start[1] == '\n')) {
if (isLiteral) {
int clPos = Tcl_DStringLength(&textBuffer);
if (numCL >= maxNumCL) {
maxNumCL *= 2;
clPosition = ckrealloc(clPosition,
maxNumCL * sizeof(int));
}
clPosition[numCL] = clPos;
numCL ++;
}
adjust++;
}
break;
case TCL_TOKEN_COMMAND:
/*
* Push any accumulated chars appearing before the command.
*/
if (Tcl_DStringLength(&textBuffer) > 0) {
int literal = TclRegisterDStringLiteral(envPtr, &textBuffer);
TclEmitPush(literal, envPtr);
numObjsToConcat++;
Tcl_DStringFree(&textBuffer);
if (numCL) {
TclContinuationsEnter(TclFetchLiteral(envPtr, literal),
numCL, clPosition);
}
numCL = 0;
}
envPtr->line += adjust;
TclCompileScript(interp, tokenPtr->start+1,
tokenPtr->size-2, envPtr);
envPtr->line -= adjust;
numObjsToConcat++;
break;
case TCL_TOKEN_VARIABLE:
/*
* Push any accumulated chars appearing before the $<var>.
*/
if (Tcl_DStringLength(&textBuffer) > 0) {
int literal;
literal = TclRegisterDStringLiteral(envPtr, &textBuffer);
TclEmitPush(literal, envPtr);
numObjsToConcat++;
Tcl_DStringFree(&textBuffer);
}
TclCompileVarSubst(interp, tokenPtr, envPtr);
numObjsToConcat++;
count -= tokenPtr->numComponents;
tokenPtr += tokenPtr->numComponents;
break;
default:
Tcl_Panic("Unexpected token type in TclCompileTokens: %d; %.*s",
tokenPtr->type, tokenPtr->size, tokenPtr->start);
}
}
/*
* Push any accumulated characters appearing at the end.
*/
if (Tcl_DStringLength(&textBuffer) > 0) {
int literal = TclRegisterDStringLiteral(envPtr, &textBuffer);
TclEmitPush(literal, envPtr);
numObjsToConcat++;
if (numCL) {
TclContinuationsEnter(TclFetchLiteral(envPtr, literal),
numCL, clPosition);
}
numCL = 0;
}
/*
* If necessary, concatenate the parts of the word.
*/
while (numObjsToConcat > 255) {
TclEmitInstInt1(INST_STR_CONCAT1, 255, envPtr);
numObjsToConcat -= 254; /* concat pushes 1 obj, the result */
}
if (numObjsToConcat > 1) {
TclEmitInstInt1(INST_STR_CONCAT1, numObjsToConcat, envPtr);
}
/*
* If the tokens yielded no instructions, push an empty string.
*/
if (envPtr->codeNext == entryCodeNext) {
PushStringLiteral(envPtr, "");
}
Tcl_DStringFree(&textBuffer);
/*
* Release the temp table we used to collect the locations of continuation
* lines, if any.
*/
if (maxNumCL) {
ckfree(clPosition);
}
TclCheckStackDepth(depth+1, envPtr);
}
/*
*----------------------------------------------------------------------
*
* TclCompileCmdWord --
*
* Given an array of parse tokens for a word containing one or more Tcl
* commands, emit inline instructions to execute them. This procedure
* differs from TclCompileTokens in that a simple word such as a loop
* body enclosed in braces is not just pushed as a string, but is itself
* parsed into tokens and compiled.
*
* Results:
* The return value is a standard Tcl result. If an error occurs, an
* error message is left in the interpreter's result.
*
* Side effects:
* Instructions are added to envPtr to execute the tokens at runtime.
*
*----------------------------------------------------------------------
*/
void
TclCompileCmdWord(
Tcl_Interp *interp, /* Used for error and status reporting. */
Tcl_Token *tokenPtr, /* Pointer to first in an array of tokens for
* a command word to compile inline. */
int count, /* Number of tokens to consider at tokenPtr.
* Must be at least 1. */
CompileEnv *envPtr) /* Holds the resulting instructions. */
{
if ((count == 1) && (tokenPtr->type == TCL_TOKEN_TEXT)) {
/*
* Handle the common case: if there is a single text token, compile it
* into an inline sequence of instructions.
*/
TclCompileScript(interp, tokenPtr->start, tokenPtr->size, envPtr);
} else {
/*
* Multiple tokens or the single token involves substitutions. Emit
* instructions to invoke the eval command procedure at runtime on the
* result of evaluating the tokens.
*/
TclCompileTokens(interp, tokenPtr, count, envPtr);
TclEmitInvoke(envPtr, INST_EVAL_STK);
}
}
/*
*----------------------------------------------------------------------
*
* TclCompileExprWords --
*
* Given an array of parse tokens representing one or more words that
* contain a Tcl expression, emit inline instructions to execute the
* expression. This procedure differs from TclCompileExpr in that it
* supports Tcl's two-level substitution semantics for expressions that
* appear as command words.
*
* Results:
* The return value is a standard Tcl result. If an error occurs, an
* error message is left in the interpreter's result.
*
* Side effects:
* Instructions are added to envPtr to execute the expression.
*
*----------------------------------------------------------------------
*/
void
TclCompileExprWords(
Tcl_Interp *interp, /* Used for error and status reporting. */
Tcl_Token *tokenPtr, /* Points to first in an array of word tokens
* tokens for the expression to compile
* inline. */
int numWords, /* Number of word tokens starting at tokenPtr.
* Must be at least 1. Each word token
* contains one or more subtokens. */
CompileEnv *envPtr) /* Holds the resulting instructions. */
{
Tcl_Token *wordPtr;
int i, concatItems;
/*
* If the expression is a single word that doesn't require substitutions,
* just compile its string into inline instructions.
*/
if ((numWords == 1) && (tokenPtr->type == TCL_TOKEN_SIMPLE_WORD)) {
TclCompileExpr(interp, tokenPtr[1].start,tokenPtr[1].size, envPtr, 1);
return;
}
/*
* Emit code to call the expr command proc at runtime. Concatenate the
* (already substituted once) expr tokens with a space between each.
*/
wordPtr = tokenPtr;
for (i = 0; i < numWords; i++) {
CompileTokens(envPtr, wordPtr, interp);
if (i < (numWords - 1)) {
PushStringLiteral(envPtr, " ");
}
wordPtr += wordPtr->numComponents + 1;
}
concatItems = 2*numWords - 1;
while (concatItems > 255) {
TclEmitInstInt1(INST_STR_CONCAT1, 255, envPtr);
concatItems -= 254;
}
if (concatItems > 1) {
TclEmitInstInt1(INST_STR_CONCAT1, concatItems, envPtr);
}
TclEmitOpcode(INST_EXPR_STK, envPtr);
}
/*
*----------------------------------------------------------------------
*
* TclCompileNoOp --
*
* Function called to compile no-op's
*
* Results:
* The return value is TCL_OK, indicating successful compilation.
*
* Side effects:
* Instructions are added to envPtr to execute a no-op at runtime. No
* result is pushed onto the stack: the compiler has to take care of this
* itself if the last compiled command is a NoOp.
*
*----------------------------------------------------------------------
*/
int
TclCompileNoOp(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
Tcl_Token *tokenPtr;
int i;
tokenPtr = parsePtr->tokenPtr;
for (i = 1; i < parsePtr->numWords; i++) {
tokenPtr = tokenPtr + tokenPtr->numComponents + 1;
if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) {
CompileTokens(envPtr, tokenPtr, interp);
TclEmitOpcode(INST_POP, envPtr);
}
}
PushStringLiteral(envPtr, "");
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* TclInitByteCodeObj --
*
* Create a ByteCode structure and initialize it from a CompileEnv
* compilation environment structure. The ByteCode structure is smaller
* and contains just that information needed to execute the bytecode
* instructions resulting from compiling a Tcl script. The resulting
* structure is placed in the specified object.
*
* Results:
* A newly constructed ByteCode object is stored in the internal
* representation of the objPtr.
*
* Side effects:
* A single heap object is allocated to hold the new ByteCode structure
* and its code, object, command location, and aux data arrays. Note that
* "ownership" (i.e., the pointers to) the Tcl objects and aux data items
* will be handed over to the new ByteCode structure from the CompileEnv
* structure.
*
*----------------------------------------------------------------------
*/
void
TclInitByteCodeObj(
Tcl_Obj *objPtr, /* Points object that should be initialized,
* and whose string rep contains the source
* code. */
CompileEnv *envPtr)/* Points to the CompileEnv structure from
* which to create a ByteCode structure. */
{
ByteCode *codePtr;
size_t codeBytes, objArrayBytes, exceptArrayBytes, cmdLocBytes;
size_t auxDataArrayBytes, structureSize;
unsigned char *p;
#ifdef TCL_COMPILE_DEBUG
unsigned char *nextPtr;
#endif
int numLitObjects = envPtr->literalArrayNext;
Namespace *namespacePtr;
int i, isNew;
Interp *iPtr;
if (envPtr->iPtr == NULL) {
Tcl_Panic("TclInitByteCodeObj() called on uninitialized CompileEnv");
}
iPtr = envPtr->iPtr;
codeBytes = envPtr->codeNext - envPtr->codeStart;
objArrayBytes = envPtr->literalArrayNext * sizeof(Tcl_Obj *);
exceptArrayBytes = envPtr->exceptArrayNext * sizeof(ExceptionRange);
auxDataArrayBytes = envPtr->auxDataArrayNext * sizeof(AuxData);
cmdLocBytes = GetCmdLocEncodingSize(envPtr);
/*
* Compute the total number of bytes needed for this bytecode.
*/
structureSize = sizeof(ByteCode);
structureSize += TCL_ALIGN(codeBytes); /* align object array */
structureSize += TCL_ALIGN(objArrayBytes); /* align exc range arr */
structureSize += TCL_ALIGN(exceptArrayBytes); /* align AuxData array */
structureSize += auxDataArrayBytes;
structureSize += cmdLocBytes;
if (envPtr->iPtr->varFramePtr != NULL) {
namespacePtr = envPtr->iPtr->varFramePtr->nsPtr;
} else {
namespacePtr = envPtr->iPtr->globalNsPtr;
}
p = ckalloc(structureSize);
codePtr = (ByteCode *) p;
codePtr->interpHandle = TclHandlePreserve(iPtr->handle);
codePtr->compileEpoch = iPtr->compileEpoch;
codePtr->nsPtr = namespacePtr;
codePtr->nsEpoch = namespacePtr->resolverEpoch;
codePtr->refCount = 1;
if (namespacePtr->compiledVarResProc || iPtr->resolverPtr) {
codePtr->flags = TCL_BYTECODE_RESOLVE_VARS;
} else {
codePtr->flags = 0;
}
codePtr->source = envPtr->source;
codePtr->procPtr = envPtr->procPtr;
codePtr->numCommands = envPtr->numCommands;
codePtr->numSrcBytes = envPtr->numSrcBytes;
codePtr->numCodeBytes = codeBytes;
codePtr->numLitObjects = numLitObjects;
codePtr->numExceptRanges = envPtr->exceptArrayNext;
codePtr->numAuxDataItems = envPtr->auxDataArrayNext;
codePtr->numCmdLocBytes = cmdLocBytes;
codePtr->maxExceptDepth = envPtr->maxExceptDepth;
codePtr->maxStackDepth = envPtr->maxStackDepth;
p += sizeof(ByteCode);
codePtr->codeStart = p;
memcpy(p, envPtr->codeStart, codeBytes);
p += TCL_ALIGN(codeBytes); /* align object array */
codePtr->objArrayPtr = (Tcl_Obj **) p;
for (i = 0; i < numLitObjects; i++) {
Tcl_Obj *fetched = TclFetchLiteral(envPtr, i);
if (objPtr == fetched) {
/*
* Prevent circular reference where the bytecode internalrep of
* a value contains a literal which is that same value.
* If this is allowed to happen, refcount decrements may not
* reach zero, and memory may leak. Bugs 467523, 3357771
*
* NOTE: [Bugs 3392070, 3389764] We make a copy based completely
* on the string value, and do not call Tcl_DuplicateObj() so we
* can be sure we do not have any lingering cycles hiding in
* the internalrep.
*/
int numBytes;
const char *bytes = Tcl_GetStringFromObj(objPtr, &numBytes);
codePtr->objArrayPtr[i] = Tcl_NewStringObj(bytes, numBytes);
Tcl_IncrRefCount(codePtr->objArrayPtr[i]);
TclReleaseLiteral((Tcl_Interp *)iPtr, objPtr);
} else {
codePtr->objArrayPtr[i] = fetched;
}
}
p += TCL_ALIGN(objArrayBytes); /* align exception range array */
if (exceptArrayBytes > 0) {
codePtr->exceptArrayPtr = (ExceptionRange *) p;
memcpy(p, envPtr->exceptArrayPtr, exceptArrayBytes);
} else {
codePtr->exceptArrayPtr = NULL;
}
p += TCL_ALIGN(exceptArrayBytes); /* align AuxData array */
if (auxDataArrayBytes > 0) {
codePtr->auxDataArrayPtr = (AuxData *) p;
memcpy(p, envPtr->auxDataArrayPtr, auxDataArrayBytes);
} else {
codePtr->auxDataArrayPtr = NULL;
}
p += auxDataArrayBytes;
#ifndef TCL_COMPILE_DEBUG
EncodeCmdLocMap(envPtr, codePtr, (unsigned char *) p);
#else
nextPtr = EncodeCmdLocMap(envPtr, codePtr, (unsigned char *) p);
if (((size_t)(nextPtr - p)) != cmdLocBytes) {
Tcl_Panic("TclInitByteCodeObj: encoded cmd location bytes %lu != expected size %lu", (unsigned long)(nextPtr - p), (unsigned long)cmdLocBytes);
}
#endif
/*
* Record various compilation-related statistics about the new ByteCode
* structure. Don't include overhead for statistics-related fields.
*/
#ifdef TCL_COMPILE_STATS
codePtr->structureSize = structureSize
- (sizeof(size_t) + sizeof(Tcl_Time));
Tcl_GetTime(&codePtr->createTime);
RecordByteCodeStats(codePtr);
#endif /* TCL_COMPILE_STATS */
/*
* Free the old internal rep then convert the object to a bytecode object
* by making its internal rep point to the just compiled ByteCode.
*/
TclFreeIntRep(objPtr);
objPtr->internalRep.twoPtrValue.ptr1 = codePtr;
objPtr->typePtr = &tclByteCodeType;
/*
* TIP #280. Associate the extended per-word line information with the
* byte code object (internal rep), for use with the bc compiler.
*/
Tcl_SetHashValue(Tcl_CreateHashEntry(iPtr->lineBCPtr, codePtr,
&isNew), envPtr->extCmdMapPtr);
envPtr->extCmdMapPtr = NULL;
/* We've used up the CompileEnv. Mark as uninitialized. */
envPtr->iPtr = NULL;
codePtr->localCachePtr = NULL;
}
/*
*----------------------------------------------------------------------
*
* TclFindCompiledLocal --
*
* This procedure is called at compile time to look up and optionally
* allocate an entry ("slot") for a variable in a procedure's array of
* local variables. If the variable's name is NULL, a new temporary
* variable is always created. (Such temporary variables can only be
* referenced using their slot index.)
*
* Results:
* If create is 0 and the name is non-NULL, then if the variable is
* found, the index of its entry in the procedure's array of local
* variables is returned; otherwise -1 is returned. If name is NULL, the
* index of a new temporary variable is returned. Finally, if create is 1
* and name is non-NULL, the index of a new entry is returned.
*
* Side effects:
* Creates and registers a new local variable if create is 1 and the
* variable is unknown, or if the name is NULL.
*
*----------------------------------------------------------------------
*/
int
TclFindCompiledLocal(
const char *name, /* Points to first character of the name of a
* scalar or array variable. If NULL, a
* temporary var should be created. */
int nameBytes, /* Number of bytes in the name. */
int create, /* If 1, allocate a local frame entry for the
* variable if it is new. */
CompileEnv *envPtr) /* Points to the current compile environment*/
{
CompiledLocal *localPtr;
int localVar = -1;
int i;
Proc *procPtr;
/*
* If not creating a temporary, does a local variable of the specified
* name already exist?
*/
procPtr = envPtr->procPtr;
if (procPtr == NULL) {
/*
* Compiling a non-body script: give it read access to the LVT in the
* current localCache
*/
LocalCache *cachePtr = envPtr->iPtr->varFramePtr->localCachePtr;
const char *localName;
Tcl_Obj **varNamePtr;
int len;
if (!cachePtr || !name) {
return -1;
}
varNamePtr = &cachePtr->varName0;
for (i=0; i < cachePtr->numVars; varNamePtr++, i++) {
if (*varNamePtr) {
localName = Tcl_GetStringFromObj(*varNamePtr, &len);
if ((len == nameBytes) && !strncmp(name, localName, len)) {
return i;
}
}
}
return -1;
}
if (name != NULL) {
int localCt = procPtr->numCompiledLocals;
localPtr = procPtr->firstLocalPtr;
for (i = 0; i < localCt; i++) {
if (!TclIsVarTemporary(localPtr)) {
char *localName = localPtr->name;
if ((nameBytes == localPtr->nameLength) &&
(strncmp(name, localName, nameBytes) == 0)) {
return i;
}
}
localPtr = localPtr->nextPtr;
}
}
/*
* Create a new variable if appropriate.
*/
if (create || (name == NULL)) {
localVar = procPtr->numCompiledLocals;
localPtr = ckalloc(TclOffset(CompiledLocal, name) + nameBytes + 1);
if (procPtr->firstLocalPtr == NULL) {
procPtr->firstLocalPtr = procPtr->lastLocalPtr = localPtr;
} else {
procPtr->lastLocalPtr->nextPtr = localPtr;
procPtr->lastLocalPtr = localPtr;
}
localPtr->nextPtr = NULL;
localPtr->nameLength = nameBytes;
localPtr->frameIndex = localVar;
localPtr->flags = 0;
if (name == NULL) {
localPtr->flags |= VAR_TEMPORARY;
}
localPtr->defValuePtr = NULL;
localPtr->resolveInfo = NULL;
if (name != NULL) {
memcpy(localPtr->name, name, nameBytes);
}
localPtr->name[nameBytes] = '\0';
procPtr->numCompiledLocals++;
}
return localVar;
}
/*
*----------------------------------------------------------------------
*
* TclExpandCodeArray --
*
* Procedure that uses malloc to allocate more storage for a CompileEnv's
* code array.
*
* Results:
* None.
*
* Side effects:
* The byte code array in *envPtr is reallocated to a new array of double
* the size, and if envPtr->mallocedCodeArray is non-zero the old array
* is freed. Byte codes are copied from the old array to the new one.
*
*----------------------------------------------------------------------
*/
void
TclExpandCodeArray(
void *envArgPtr) /* Points to the CompileEnv whose code array
* must be enlarged. */
{
CompileEnv *envPtr = envArgPtr;
/* The CompileEnv containing the code array to
* be doubled in size. */
/*
* envPtr->codeNext is equal to envPtr->codeEnd. The currently defined
* code bytes are stored between envPtr->codeStart and envPtr->codeNext-1
* [inclusive].
*/
size_t currBytes = envPtr->codeNext - envPtr->codeStart;
size_t newBytes = 2 * (envPtr->codeEnd - envPtr->codeStart);
if (envPtr->mallocedCodeArray) {
envPtr->codeStart = ckrealloc(envPtr->codeStart, newBytes);
} else {
/*
* envPtr->codeStart isn't a ckalloc'd pointer, so we must code a
* ckrealloc equivalent for ourselves.
*/
unsigned char *newPtr = ckalloc(newBytes);
memcpy(newPtr, envPtr->codeStart, currBytes);
envPtr->codeStart = newPtr;
envPtr->mallocedCodeArray = 1;
}
envPtr->codeNext = envPtr->codeStart + currBytes;
envPtr->codeEnd = envPtr->codeStart + newBytes;
}
/*
*----------------------------------------------------------------------
*
* EnterCmdStartData --
*
* Registers the starting source and bytecode location of a command. This
* information is used at runtime to map between instruction pc and
* source locations.
*
* Results:
* None.
*
* Side effects:
* Inserts source and code location information into the compilation
* environment envPtr for the command at index cmdIndex. The compilation
* environment's CmdLocation array is grown if necessary.
*
*----------------------------------------------------------------------
*/
static void
EnterCmdStartData(
CompileEnv *envPtr, /* Points to the compilation environment
* structure in which to enter command
* location information. */
int cmdIndex, /* Index of the command whose start data is
* being set. */
int srcOffset, /* Offset of first char of the command. */
int codeOffset) /* Offset of first byte of command code. */
{
CmdLocation *cmdLocPtr;
if ((cmdIndex < 0) || (cmdIndex >= envPtr->numCommands)) {
Tcl_Panic("EnterCmdStartData: bad command index %d", cmdIndex);
}
if (cmdIndex >= envPtr->cmdMapEnd) {
/*
* Expand the command location array by allocating more storage from
* the heap. The currently allocated CmdLocation entries are stored
* from cmdMapPtr[0] up to cmdMapPtr[envPtr->cmdMapEnd] (inclusive).
*/
size_t currElems = envPtr->cmdMapEnd;
size_t newElems = 2 * currElems;
size_t currBytes = currElems * sizeof(CmdLocation);
size_t newBytes = newElems * sizeof(CmdLocation);
if (envPtr->mallocedCmdMap) {
envPtr->cmdMapPtr = ckrealloc(envPtr->cmdMapPtr, newBytes);
} else {
/*
* envPtr->cmdMapPtr isn't a ckalloc'd pointer, so we must code a
* ckrealloc equivalent for ourselves.
*/
CmdLocation *newPtr = ckalloc(newBytes);
memcpy(newPtr, envPtr->cmdMapPtr, currBytes);
envPtr->cmdMapPtr = newPtr;
envPtr->mallocedCmdMap = 1;
}
envPtr->cmdMapEnd = newElems;
}
if (cmdIndex > 0) {
if (codeOffset < envPtr->cmdMapPtr[cmdIndex-1].codeOffset) {
Tcl_Panic("EnterCmdStartData: cmd map not sorted by code offset");
}
}
cmdLocPtr = &envPtr->cmdMapPtr[cmdIndex];
cmdLocPtr->codeOffset = codeOffset;
cmdLocPtr->srcOffset = srcOffset;
cmdLocPtr->numSrcBytes = -1;
cmdLocPtr->numCodeBytes = -1;
}
/*
*----------------------------------------------------------------------
*
* EnterCmdExtentData --
*
* Registers the source and bytecode length for a command. This
* information is used at runtime to map between instruction pc and
* source locations.
*
* Results:
* None.
*
* Side effects:
* Inserts source and code length information into the compilation
* environment envPtr for the command at index cmdIndex. Starting source
* and bytecode information for the command must already have been
* registered.
*
*----------------------------------------------------------------------
*/
static void
EnterCmdExtentData(
CompileEnv *envPtr, /* Points to the compilation environment
* structure in which to enter command
* location information. */
int cmdIndex, /* Index of the command whose source and code
* length data is being set. */
int numSrcBytes, /* Number of command source chars. */
int numCodeBytes) /* Offset of last byte of command code. */
{
CmdLocation *cmdLocPtr;
if ((cmdIndex < 0) || (cmdIndex >= envPtr->numCommands)) {
Tcl_Panic("EnterCmdExtentData: bad command index %d", cmdIndex);
}
if (cmdIndex > envPtr->cmdMapEnd) {
Tcl_Panic("EnterCmdExtentData: missing start data for command %d",
cmdIndex);
}
cmdLocPtr = &envPtr->cmdMapPtr[cmdIndex];
cmdLocPtr->numSrcBytes = numSrcBytes;
cmdLocPtr->numCodeBytes = numCodeBytes;
}
/*
*----------------------------------------------------------------------
* TIP #280
*
* EnterCmdWordData --
*
* Registers the lines for the words of a command. This information is
* used at runtime by 'info frame'.
*
* Results:
* None.
*
* Side effects:
* Inserts word location information into the compilation environment
* envPtr for the command at index cmdIndex. The compilation
* environment's ExtCmdLoc.ECL array is grown if necessary.
*
*----------------------------------------------------------------------
*/
static void
EnterCmdWordData(
ExtCmdLoc *eclPtr, /* Points to the map environment structure in
* which to enter command location
* information. */
int srcOffset, /* Offset of first char of the command. */
Tcl_Token *tokenPtr,
const char *cmd,
int len,
int numWords,
int line,
int *clNext,
int **wlines,
CompileEnv *envPtr)
{
ECL *ePtr;
const char *last;
int wordIdx, wordLine, *wwlines, *wordNext;
if (eclPtr->nuloc >= eclPtr->nloc) {
/*
* Expand the ECL array by allocating more storage from the heap. The
* currently allocated ECL entries are stored from eclPtr->loc[0] up
* to eclPtr->loc[eclPtr->nuloc-1] (inclusive).
*/
size_t currElems = eclPtr->nloc;
size_t newElems = (currElems ? 2*currElems : 1);
size_t newBytes = newElems * sizeof(ECL);
eclPtr->loc = ckrealloc(eclPtr->loc, newBytes);
eclPtr->nloc = newElems;
}
ePtr = &eclPtr->loc[eclPtr->nuloc];
ePtr->srcOffset = srcOffset;
ePtr->line = ckalloc(numWords * sizeof(int));
ePtr->next = ckalloc(numWords * sizeof(int *));
ePtr->nline = numWords;
wwlines = ckalloc(numWords * sizeof(int));
last = cmd;
wordLine = line;
wordNext = clNext;
for (wordIdx=0 ; wordIdx<numWords;
wordIdx++, tokenPtr += tokenPtr->numComponents + 1) {
TclAdvanceLines(&wordLine, last, tokenPtr->start);
TclAdvanceContinuations(&wordLine, &wordNext,
tokenPtr->start - envPtr->source);
/* See Ticket 4b61afd660 */
wwlines[wordIdx] =
((wordIdx == 0) || TclWordKnownAtCompileTime(tokenPtr, NULL))
? wordLine : -1;
ePtr->line[wordIdx] = wordLine;
ePtr->next[wordIdx] = wordNext;
last = tokenPtr->start;
}
*wlines = wwlines;
eclPtr->nuloc ++;
}
/*
*----------------------------------------------------------------------
*
* TclCreateExceptRange --
*
* Procedure that allocates and initializes a new ExceptionRange
* structure of the specified kind in a CompileEnv.
*
* Results:
* Returns the index for the newly created ExceptionRange.
*
* Side effects:
* If there is not enough room in the CompileEnv's ExceptionRange array,
* the array in expanded: a new array of double the size is allocated, if
* envPtr->mallocedExceptArray is non-zero the old array is freed, and
* ExceptionRange entries are copied from the old array to the new one.
*
*----------------------------------------------------------------------
*/
int
TclCreateExceptRange(
ExceptionRangeType type, /* The kind of ExceptionRange desired. */
CompileEnv *envPtr)/* Points to CompileEnv for which to create a
* new ExceptionRange structure. */
{
ExceptionRange *rangePtr;
ExceptionAux *auxPtr;
int index = envPtr->exceptArrayNext;
if (index >= envPtr->exceptArrayEnd) {
/*
* Expand the ExceptionRange array. The currently allocated entries
* are stored between elements 0 and (envPtr->exceptArrayNext - 1)
* [inclusive].
*/
size_t currBytes =
envPtr->exceptArrayNext * sizeof(ExceptionRange);
size_t currBytes2 = envPtr->exceptArrayNext * sizeof(ExceptionAux);
int newElems = 2*envPtr->exceptArrayEnd;
size_t newBytes = newElems * sizeof(ExceptionRange);
size_t newBytes2 = newElems * sizeof(ExceptionAux);
if (envPtr->mallocedExceptArray) {
envPtr->exceptArrayPtr =
ckrealloc(envPtr->exceptArrayPtr, newBytes);
envPtr->exceptAuxArrayPtr =
ckrealloc(envPtr->exceptAuxArrayPtr, newBytes2);
} else {
/*
* envPtr->exceptArrayPtr isn't a ckalloc'd pointer, so we must
* code a ckrealloc equivalent for ourselves.
*/
ExceptionRange *newPtr = ckalloc(newBytes);
ExceptionAux *newPtr2 = ckalloc(newBytes2);
memcpy(newPtr, envPtr->exceptArrayPtr, currBytes);
memcpy(newPtr2, envPtr->exceptAuxArrayPtr, currBytes2);
envPtr->exceptArrayPtr = newPtr;
envPtr->exceptAuxArrayPtr = newPtr2;
envPtr->mallocedExceptArray = 1;
}
envPtr->exceptArrayEnd = newElems;
}
envPtr->exceptArrayNext++;
rangePtr = &envPtr->exceptArrayPtr[index];
rangePtr->type = type;
rangePtr->nestingLevel = envPtr->exceptDepth;
rangePtr->codeOffset = -1;
rangePtr->numCodeBytes = -1;
rangePtr->breakOffset = -1;
rangePtr->continueOffset = -1;
rangePtr->catchOffset = -1;
auxPtr = &envPtr->exceptAuxArrayPtr[index];
auxPtr->supportsContinue = 1;
auxPtr->stackDepth = envPtr->currStackDepth;
auxPtr->expandTarget = envPtr->expandCount;
auxPtr->expandTargetDepth = -1;
auxPtr->numBreakTargets = 0;
auxPtr->breakTargets = NULL;
auxPtr->allocBreakTargets = 0;
auxPtr->numContinueTargets = 0;
auxPtr->continueTargets = NULL;
auxPtr->allocContinueTargets = 0;
return index;
}
/*
* ---------------------------------------------------------------------
*
* TclGetInnermostExceptionRange --
*
* Returns the innermost exception range that covers the current code
* creation point, and (optionally) the stack depth that is expected at
* that point. Relies on the fact that the range has a numCodeBytes = -1
* when it is being populated and that inner ranges come after outer
* ranges.
*
* ---------------------------------------------------------------------
*/
ExceptionRange *
TclGetInnermostExceptionRange(
CompileEnv *envPtr,
int returnCode,
ExceptionAux **auxPtrPtr)
{
int i = envPtr->exceptArrayNext;
ExceptionRange *rangePtr = envPtr->exceptArrayPtr + i;
while (i > 0) {
rangePtr--; i--;
if (CurrentOffset(envPtr) >= rangePtr->codeOffset &&
(rangePtr->numCodeBytes == -1 || CurrentOffset(envPtr) <
rangePtr->codeOffset+rangePtr->numCodeBytes) &&
(returnCode != TCL_CONTINUE ||
envPtr->exceptAuxArrayPtr[i].supportsContinue)) {
if (auxPtrPtr) {
*auxPtrPtr = envPtr->exceptAuxArrayPtr + i;
}
return rangePtr;
}
}
return NULL;
}
/*
* ---------------------------------------------------------------------
*
* TclAddLoopBreakFixup, TclAddLoopContinueFixup --
*
* Adds a place that wants to break/continue to the loop exception range
* tracking that will be fixed up once the loop can be finalized. These
* functions will generate an INST_JUMP4 that will be fixed up during the
* loop finalization.
*
* ---------------------------------------------------------------------
*/
void
TclAddLoopBreakFixup(
CompileEnv *envPtr,
ExceptionAux *auxPtr)
{
int range = auxPtr - envPtr->exceptAuxArrayPtr;
if (envPtr->exceptArrayPtr[range].type != LOOP_EXCEPTION_RANGE) {
Tcl_Panic("trying to add 'break' fixup to full exception range");
}
if (++auxPtr->numBreakTargets > auxPtr->allocBreakTargets) {
auxPtr->allocBreakTargets *= 2;
auxPtr->allocBreakTargets += 2;
if (auxPtr->breakTargets) {
auxPtr->breakTargets = ckrealloc(auxPtr->breakTargets,
sizeof(int) * auxPtr->allocBreakTargets);
} else {
auxPtr->breakTargets =
ckalloc(sizeof(int) * auxPtr->allocBreakTargets);
}
}
auxPtr->breakTargets[auxPtr->numBreakTargets - 1] = CurrentOffset(envPtr);
TclEmitInstInt4(INST_JUMP4, 0, envPtr);
}
void
TclAddLoopContinueFixup(
CompileEnv *envPtr,
ExceptionAux *auxPtr)
{
int range = auxPtr - envPtr->exceptAuxArrayPtr;
if (envPtr->exceptArrayPtr[range].type != LOOP_EXCEPTION_RANGE) {
Tcl_Panic("trying to add 'continue' fixup to full exception range");
}
if (++auxPtr->numContinueTargets > auxPtr->allocContinueTargets) {
auxPtr->allocContinueTargets *= 2;
auxPtr->allocContinueTargets += 2;
if (auxPtr->continueTargets) {
auxPtr->continueTargets = ckrealloc(auxPtr->continueTargets,
sizeof(int) * auxPtr->allocContinueTargets);
} else {
auxPtr->continueTargets =
ckalloc(sizeof(int) * auxPtr->allocContinueTargets);
}
}
auxPtr->continueTargets[auxPtr->numContinueTargets - 1] =
CurrentOffset(envPtr);
TclEmitInstInt4(INST_JUMP4, 0, envPtr);
}
/*
* ---------------------------------------------------------------------
*
* TclCleanupStackForBreakContinue --
*
* Ditch the extra elements from the auxiliary stack and the main stack.
* How to do this exactly depends on whether there are any elements on
* the auxiliary stack to pop.
*
* ---------------------------------------------------------------------
*/
void
TclCleanupStackForBreakContinue(
CompileEnv *envPtr,
ExceptionAux *auxPtr)
{
int savedStackDepth = envPtr->currStackDepth;
int toPop = envPtr->expandCount - auxPtr->expandTarget;
if (toPop > 0) {
while (toPop --> 0) {
TclEmitOpcode(INST_EXPAND_DROP, envPtr);
}
TclAdjustStackDepth(auxPtr->expandTargetDepth - envPtr->currStackDepth,
envPtr);
envPtr->currStackDepth = auxPtr->expandTargetDepth;
}
toPop = envPtr->currStackDepth - auxPtr->stackDepth;
while (toPop --> 0) {
TclEmitOpcode(INST_POP, envPtr);
}
envPtr->currStackDepth = savedStackDepth;
}
/*
* ---------------------------------------------------------------------
*
* StartExpanding --
*
* Pushes an INST_EXPAND_START and does some additional housekeeping so
* that the [break] and [continue] compilers can use an exception-free
* issue to discard it.
*
* ---------------------------------------------------------------------
*/
static void
StartExpanding(
CompileEnv *envPtr)
{
int i;
TclEmitOpcode(INST_EXPAND_START, envPtr);
/*
* Update inner exception ranges with information about the environment
* where this expansion started.
*/
for (i=0 ; i<envPtr->exceptArrayNext ; i++) {
ExceptionRange *rangePtr = &envPtr->exceptArrayPtr[i];
ExceptionAux *auxPtr = &envPtr->exceptAuxArrayPtr[i];
/*
* Ignore loops unless they're still being built.
*/
if (rangePtr->codeOffset > CurrentOffset(envPtr)) {
continue;
}
if (rangePtr->numCodeBytes != -1) {
continue;
}
/*
* Adequate condition: further out loops and further in exceptions
* don't actually need this information.
*/
if (auxPtr->expandTarget == envPtr->expandCount) {
auxPtr->expandTargetDepth = envPtr->currStackDepth;
}
}
/*
* There's now one more expansion being processed on the auxiliary stack.
*/
envPtr->expandCount++;
}
/*
* ---------------------------------------------------------------------
*
* TclFinalizeLoopExceptionRange --
*
* Finalizes a loop exception range, binding the registered [break] and
* [continue] implementations so that they jump to the correct place.
* Note that this must only be called after *all* the exception range
* target offsets have been set.
*
* ---------------------------------------------------------------------
*/
void
TclFinalizeLoopExceptionRange(
CompileEnv *envPtr,
int range)
{
ExceptionRange *rangePtr = &envPtr->exceptArrayPtr[range];
ExceptionAux *auxPtr = &envPtr->exceptAuxArrayPtr[range];
int i, offset;
unsigned char *site;
if (rangePtr->type != LOOP_EXCEPTION_RANGE) {
Tcl_Panic("trying to finalize a loop exception range");
}
/*
* Do the jump fixups. Note that these are always issued as INST_JUMP4 so
* there is no need to fuss around with updating code offsets.
*/
for (i=0 ; i<auxPtr->numBreakTargets ; i++) {
site = envPtr->codeStart + auxPtr->breakTargets[i];
offset = rangePtr->breakOffset - auxPtr->breakTargets[i];
TclUpdateInstInt4AtPc(INST_JUMP4, offset, site);
}
for (i=0 ; i<auxPtr->numContinueTargets ; i++) {
site = envPtr->codeStart + auxPtr->continueTargets[i];
if (rangePtr->continueOffset == -1) {
int j;
/*
* WTF? Can't bind, so revert to an INST_CONTINUE. Not enough
* space to do anything else.
*/
*site = INST_CONTINUE;
for (j=0 ; j<4 ; j++) {
*++site = INST_NOP;
}
} else {
offset = rangePtr->continueOffset - auxPtr->continueTargets[i];
TclUpdateInstInt4AtPc(INST_JUMP4, offset, site);
}
}
/*
* Drop the arrays we were holding the only reference to.
*/
if (auxPtr->breakTargets) {
ckfree(auxPtr->breakTargets);
auxPtr->breakTargets = NULL;
auxPtr->numBreakTargets = 0;
}
if (auxPtr->continueTargets) {
ckfree(auxPtr->continueTargets);
auxPtr->continueTargets = NULL;
auxPtr->numContinueTargets = 0;
}
}
/*
*----------------------------------------------------------------------
*
* TclCreateAuxData --
*
* Procedure that allocates and initializes a new AuxData structure in a
* CompileEnv's array of compilation auxiliary data records. These
* AuxData records hold information created during compilation by
* CompileProcs and used by instructions during execution.
*
* Results:
* Returns the index for the newly created AuxData structure.
*
* Side effects:
* If there is not enough room in the CompileEnv's AuxData array, the
* AuxData array in expanded: a new array of double the size is
* allocated, if envPtr->mallocedAuxDataArray is non-zero the old array
* is freed, and AuxData entries are copied from the old array to the new
* one.
*
*----------------------------------------------------------------------
*/
int
TclCreateAuxData(
ClientData clientData, /* The compilation auxiliary data to store in
* the new aux data record. */
const AuxDataType *typePtr, /* Pointer to the type to attach to this
* AuxData */
CompileEnv *envPtr)/* Points to the CompileEnv for which a new
* aux data structure is to be allocated. */
{
int index; /* Index for the new AuxData structure. */
AuxData *auxDataPtr;
/* Points to the new AuxData structure */
index = envPtr->auxDataArrayNext;
if (index >= envPtr->auxDataArrayEnd) {
/*
* Expand the AuxData array. The currently allocated entries are
* stored between elements 0 and (envPtr->auxDataArrayNext - 1)
* [inclusive].
*/
size_t currBytes = envPtr->auxDataArrayNext * sizeof(AuxData);
int newElems = 2*envPtr->auxDataArrayEnd;
size_t newBytes = newElems * sizeof(AuxData);
if (envPtr->mallocedAuxDataArray) {
envPtr->auxDataArrayPtr =
ckrealloc(envPtr->auxDataArrayPtr, newBytes);
} else {
/*
* envPtr->auxDataArrayPtr isn't a ckalloc'd pointer, so we must
* code a ckrealloc equivalent for ourselves.
*/
AuxData *newPtr = ckalloc(newBytes);
memcpy(newPtr, envPtr->auxDataArrayPtr, currBytes);
envPtr->auxDataArrayPtr = newPtr;
envPtr->mallocedAuxDataArray = 1;
}
envPtr->auxDataArrayEnd = newElems;
}
envPtr->auxDataArrayNext++;
auxDataPtr = &envPtr->auxDataArrayPtr[index];
auxDataPtr->clientData = clientData;
auxDataPtr->type = typePtr;
return index;
}
/*
*----------------------------------------------------------------------
*
* TclInitJumpFixupArray --
*
* Initializes a JumpFixupArray structure to hold some number of jump
* fixup entries.
*
* Results:
* None.
*
* Side effects:
* The JumpFixupArray structure is initialized.
*
*----------------------------------------------------------------------
*/
void
TclInitJumpFixupArray(
JumpFixupArray *fixupArrayPtr)
/* Points to the JumpFixupArray structure to
* initialize. */
{
fixupArrayPtr->fixup = fixupArrayPtr->staticFixupSpace;
fixupArrayPtr->next = 0;
fixupArrayPtr->end = JUMPFIXUP_INIT_ENTRIES - 1;
fixupArrayPtr->mallocedArray = 0;
}
/*
*----------------------------------------------------------------------
*
* TclExpandJumpFixupArray --
*
* Procedure that uses malloc to allocate more storage for a jump fixup
* array.
*
* Results:
* None.
*
* Side effects:
* The jump fixup array in *fixupArrayPtr is reallocated to a new array
* of double the size, and if fixupArrayPtr->mallocedArray is non-zero
* the old array is freed. Jump fixup structures are copied from the old
* array to the new one.
*
*----------------------------------------------------------------------
*/
void
TclExpandJumpFixupArray(
JumpFixupArray *fixupArrayPtr)
/* Points to the JumpFixupArray structure to
* enlarge. */
{
/*
* The currently allocated jump fixup entries are stored from fixup[0] up
* to fixup[fixupArrayPtr->fixupNext] (*not* inclusive). We assume
* fixupArrayPtr->fixupNext is equal to fixupArrayPtr->fixupEnd.
*/
size_t currBytes = fixupArrayPtr->next * sizeof(JumpFixup);
int newElems = 2*(fixupArrayPtr->end + 1);
size_t newBytes = newElems * sizeof(JumpFixup);
if (fixupArrayPtr->mallocedArray) {
fixupArrayPtr->fixup = ckrealloc(fixupArrayPtr->fixup, newBytes);
} else {
/*
* fixupArrayPtr->fixup isn't a ckalloc'd pointer, so we must code a
* ckrealloc equivalent for ourselves.
*/
JumpFixup *newPtr = ckalloc(newBytes);
memcpy(newPtr, fixupArrayPtr->fixup, currBytes);
fixupArrayPtr->fixup = newPtr;
fixupArrayPtr->mallocedArray = 1;
}
fixupArrayPtr->end = newElems;
}
/*
*----------------------------------------------------------------------
*
* TclFreeJumpFixupArray --
*
* Free any storage allocated in a jump fixup array structure.
*
* Results:
* None.
*
* Side effects:
* Allocated storage in the JumpFixupArray structure is freed.
*
*----------------------------------------------------------------------
*/
void
TclFreeJumpFixupArray(
JumpFixupArray *fixupArrayPtr)
/* Points to the JumpFixupArray structure to
* free. */
{
if (fixupArrayPtr->mallocedArray) {
ckfree(fixupArrayPtr->fixup);
}
}
/*
*----------------------------------------------------------------------
*
* TclEmitForwardJump --
*
* Procedure to emit a two-byte forward jump of kind "jumpType". Since
* the jump may later have to be grown to five bytes if the jump target
* is more than, say, 127 bytes away, this procedure also initializes a
* JumpFixup record with information about the jump.
*
* Results:
* None.
*
* Side effects:
* The JumpFixup record pointed to by "jumpFixupPtr" is initialized with
* information needed later if the jump is to be grown. Also, a two byte
* jump of the designated type is emitted at the current point in the
* bytecode stream.
*
*----------------------------------------------------------------------
*/
void
TclEmitForwardJump(
CompileEnv *envPtr, /* Points to the CompileEnv structure that
* holds the resulting instruction. */
TclJumpType jumpType, /* Indicates the kind of jump: if true or
* false or unconditional. */
JumpFixup *jumpFixupPtr) /* Points to the JumpFixup structure to
* initialize with information about this
* forward jump. */
{
/*
* Initialize the JumpFixup structure:
* - codeOffset is offset of first byte of jump below
* - cmdIndex is index of the command after the current one
* - exceptIndex is the index of the first ExceptionRange after the
* current one.
*/
jumpFixupPtr->jumpType = jumpType;
jumpFixupPtr->codeOffset = envPtr->codeNext - envPtr->codeStart;
jumpFixupPtr->cmdIndex = envPtr->numCommands;
jumpFixupPtr->exceptIndex = envPtr->exceptArrayNext;
switch (jumpType) {
case TCL_UNCONDITIONAL_JUMP:
TclEmitInstInt1(INST_JUMP1, 0, envPtr);
break;
case TCL_TRUE_JUMP:
TclEmitInstInt1(INST_JUMP_TRUE1, 0, envPtr);
break;
default:
TclEmitInstInt1(INST_JUMP_FALSE1, 0, envPtr);
break;
}
}
/*
*----------------------------------------------------------------------
*
* TclFixupForwardJump --
*
* Procedure that updates a previously-emitted forward jump to jump a
* specified number of bytes, "jumpDist". If necessary, the jump is grown
* from two to five bytes; this is done if the jump distance is greater
* than "distThreshold" (normally 127 bytes). The jump is described by a
* JumpFixup record previously initialized by TclEmitForwardJump.
*
* Results:
* 1 if the jump was grown and subsequent instructions had to be moved;
* otherwise 0. This result is returned to allow callers to update any
* additional code offsets they may hold.
*
* Side effects:
* The jump may be grown and subsequent instructions moved. If this
* happens, the code offsets for any commands and any ExceptionRange
* records between the jump and the current code address will be updated
* to reflect the moved code. Also, the bytecode instruction array in the
* CompileEnv structure may be grown and reallocated.
*
*----------------------------------------------------------------------
*/
int
TclFixupForwardJump(
CompileEnv *envPtr, /* Points to the CompileEnv structure that
* holds the resulting instruction. */
JumpFixup *jumpFixupPtr, /* Points to the JumpFixup structure that
* describes the forward jump. */
int jumpDist, /* Jump distance to set in jump instr. */
int distThreshold) /* Maximum distance before the two byte jump
* is grown to five bytes. */
{
unsigned char *jumpPc, *p;
int firstCmd, lastCmd, firstRange, lastRange, k;
unsigned numBytes;
if (jumpDist <= distThreshold) {
jumpPc = envPtr->codeStart + jumpFixupPtr->codeOffset;
switch (jumpFixupPtr->jumpType) {
case TCL_UNCONDITIONAL_JUMP:
TclUpdateInstInt1AtPc(INST_JUMP1, jumpDist, jumpPc);
break;
case TCL_TRUE_JUMP:
TclUpdateInstInt1AtPc(INST_JUMP_TRUE1, jumpDist, jumpPc);
break;
default:
TclUpdateInstInt1AtPc(INST_JUMP_FALSE1, jumpDist, jumpPc);
break;
}
return 0;
}
/*
* We must grow the jump then move subsequent instructions down. Note that
* if we expand the space for generated instructions, code addresses might
* change; be careful about updating any of these addresses held in
* variables.
*/
if ((envPtr->codeNext + 3) > envPtr->codeEnd) {
TclExpandCodeArray(envPtr);
}
jumpPc = envPtr->codeStart + jumpFixupPtr->codeOffset;
numBytes = envPtr->codeNext-jumpPc-2;
p = jumpPc+2;
memmove(p+3, p, numBytes);
envPtr->codeNext += 3;
jumpDist += 3;
switch (jumpFixupPtr->jumpType) {
case TCL_UNCONDITIONAL_JUMP:
TclUpdateInstInt4AtPc(INST_JUMP4, jumpDist, jumpPc);
break;
case TCL_TRUE_JUMP:
TclUpdateInstInt4AtPc(INST_JUMP_TRUE4, jumpDist, jumpPc);
break;
default:
TclUpdateInstInt4AtPc(INST_JUMP_FALSE4, jumpDist, jumpPc);
break;
}
/*
* Adjust the code offsets for any commands and any ExceptionRange records
* between the jump and the current code address.
*/
firstCmd = jumpFixupPtr->cmdIndex;
lastCmd = envPtr->numCommands - 1;
if (firstCmd < lastCmd) {
for (k = firstCmd; k <= lastCmd; k++) {
envPtr->cmdMapPtr[k].codeOffset += 3;
}
}
firstRange = jumpFixupPtr->exceptIndex;
lastRange = envPtr->exceptArrayNext - 1;
for (k = firstRange; k <= lastRange; k++) {
ExceptionRange *rangePtr = &envPtr->exceptArrayPtr[k];
rangePtr->codeOffset += 3;
switch (rangePtr->type) {
case LOOP_EXCEPTION_RANGE:
rangePtr->breakOffset += 3;
if (rangePtr->continueOffset != -1) {
rangePtr->continueOffset += 3;
}
break;
case CATCH_EXCEPTION_RANGE:
rangePtr->catchOffset += 3;
break;
default:
Tcl_Panic("TclFixupForwardJump: bad ExceptionRange type %d",
rangePtr->type);
}
}
for (k = 0 ; k < envPtr->exceptArrayNext ; k++) {
ExceptionAux *auxPtr = &envPtr->exceptAuxArrayPtr[k];
int i;
for (i=0 ; i<auxPtr->numBreakTargets ; i++) {
if (jumpFixupPtr->codeOffset < auxPtr->breakTargets[i]) {
auxPtr->breakTargets[i] += 3;
}
}
for (i=0 ; i<auxPtr->numContinueTargets ; i++) {
if (jumpFixupPtr->codeOffset < auxPtr->continueTargets[i]) {
auxPtr->continueTargets[i] += 3;
}
}
}
return 1; /* the jump was grown */
}
/*
*----------------------------------------------------------------------
*
* TclEmitInvoke --
*
* Emit one of the invoke-related instructions, wrapping it if necessary
* in code that ensures that any break or continue operation passing
* through it gets the stack unwinding correct, converting it into an
* internal jump if in an appropriate context.
*
* Results:
* None
*
* Side effects:
* Issues the jump with all correct stack management. May create another
* loop exception range; pointers to ExceptionRange and ExceptionAux
* structures should not be held across this call.
*
*----------------------------------------------------------------------
*/
void
TclEmitInvoke(
CompileEnv *envPtr,
int opcode,
...)
{
va_list argList;
ExceptionRange *rangePtr;
ExceptionAux *auxBreakPtr, *auxContinuePtr;
int arg1, arg2, wordCount = 0, expandCount = 0;
int loopRange = 0, breakRange = 0, continueRange = 0;
int cleanup, depth = TclGetStackDepth(envPtr);
/*
* Parse the arguments.
*/
va_start(argList, opcode);
switch (opcode) {
case INST_INVOKE_STK1:
wordCount = arg1 = cleanup = va_arg(argList, int);
arg2 = 0;
break;
case INST_INVOKE_STK4:
wordCount = arg1 = cleanup = va_arg(argList, int);
arg2 = 0;
break;
case INST_INVOKE_REPLACE:
arg1 = va_arg(argList, int);
arg2 = va_arg(argList, int);
wordCount = arg1 + arg2 - 1;
cleanup = arg1 + 1;
break;
default:
Tcl_Panic("unexpected opcode");
case INST_EVAL_STK:
wordCount = cleanup = 1;
arg1 = arg2 = 0;
break;
case INST_RETURN_STK:
wordCount = cleanup = 2;
arg1 = arg2 = 0;
break;
case INST_INVOKE_EXPANDED:
wordCount = arg1 = cleanup = va_arg(argList, int);
arg2 = 0;
expandCount = 1;
break;
}
va_end(argList);
/*
* Determine if we need to handle break and continue exceptions with a
* special handling exception range (so that we can correctly unwind the
* stack).
*
* These must be done separately; they can be different (especially for
* calls from inside a [for] increment clause).
*/
rangePtr = TclGetInnermostExceptionRange(envPtr, TCL_CONTINUE,
&auxContinuePtr);
if (rangePtr == NULL || rangePtr->type != LOOP_EXCEPTION_RANGE) {
auxContinuePtr = NULL;
} else if (auxContinuePtr->stackDepth == envPtr->currStackDepth-wordCount
&& auxContinuePtr->expandTarget == envPtr->expandCount-expandCount) {
auxContinuePtr = NULL;
} else {
continueRange = auxContinuePtr - envPtr->exceptAuxArrayPtr;
}
rangePtr = TclGetInnermostExceptionRange(envPtr, TCL_BREAK, &auxBreakPtr);
if (rangePtr == NULL || rangePtr->type != LOOP_EXCEPTION_RANGE) {
auxBreakPtr = NULL;
} else if (auxContinuePtr == NULL
&& auxBreakPtr->stackDepth == envPtr->currStackDepth-wordCount
&& auxBreakPtr->expandTarget == envPtr->expandCount-expandCount) {
auxBreakPtr = NULL;
} else {
breakRange = auxBreakPtr - envPtr->exceptAuxArrayPtr;
}
if (auxBreakPtr != NULL || auxContinuePtr != NULL) {
loopRange = TclCreateExceptRange(LOOP_EXCEPTION_RANGE, envPtr);
ExceptionRangeStarts(envPtr, loopRange);
}
/*
* Issue the invoke itself.
*/
switch (opcode) {
case INST_INVOKE_STK1:
TclEmitInstInt1(INST_INVOKE_STK1, arg1, envPtr);
break;
case INST_INVOKE_STK4:
TclEmitInstInt4(INST_INVOKE_STK4, arg1, envPtr);
break;
case INST_INVOKE_EXPANDED:
TclEmitOpcode(INST_INVOKE_EXPANDED, envPtr);
envPtr->expandCount--;
TclAdjustStackDepth(1 - arg1, envPtr);
break;
case INST_EVAL_STK:
TclEmitOpcode(INST_EVAL_STK, envPtr);
break;
case INST_RETURN_STK:
TclEmitOpcode(INST_RETURN_STK, envPtr);
break;
case INST_INVOKE_REPLACE:
TclEmitInstInt4(INST_INVOKE_REPLACE, arg1, envPtr);
TclEmitInt1(arg2, envPtr);
TclAdjustStackDepth(-1, envPtr); /* Correction to stack depth calcs */
break;
}
/*
* If we're generating a special wrapper exception range, we need to
* finish that up now.
*/
if (auxBreakPtr != NULL || auxContinuePtr != NULL) {
int savedStackDepth = envPtr->currStackDepth;
int savedExpandCount = envPtr->expandCount;
JumpFixup nonTrapFixup;
if (auxBreakPtr != NULL) {
auxBreakPtr = envPtr->exceptAuxArrayPtr + breakRange;
}
if (auxContinuePtr != NULL) {
auxContinuePtr = envPtr->exceptAuxArrayPtr + continueRange;
}
ExceptionRangeEnds(envPtr, loopRange);
TclEmitForwardJump(envPtr, TCL_UNCONDITIONAL_JUMP, &nonTrapFixup);
/*
* Careful! When generating these stack unwinding sequences, the depth
* of stack in the cases where they are taken is not the same as if
* the exception is not taken.
*/
if (auxBreakPtr != NULL) {
TclAdjustStackDepth(-1, envPtr);
ExceptionRangeTarget(envPtr, loopRange, breakOffset);
TclCleanupStackForBreakContinue(envPtr, auxBreakPtr);
TclAddLoopBreakFixup(envPtr, auxBreakPtr);
TclAdjustStackDepth(1, envPtr);
envPtr->currStackDepth = savedStackDepth;
envPtr->expandCount = savedExpandCount;
}
if (auxContinuePtr != NULL) {
TclAdjustStackDepth(-1, envPtr);
ExceptionRangeTarget(envPtr, loopRange, continueOffset);
TclCleanupStackForBreakContinue(envPtr, auxContinuePtr);
TclAddLoopContinueFixup(envPtr, auxContinuePtr);
TclAdjustStackDepth(1, envPtr);
envPtr->currStackDepth = savedStackDepth;
envPtr->expandCount = savedExpandCount;
}
TclFinalizeLoopExceptionRange(envPtr, loopRange);
TclFixupForwardJumpToHere(envPtr, &nonTrapFixup, 127);
}
TclCheckStackDepth(depth+1-cleanup, envPtr);
}
/*
*----------------------------------------------------------------------
*
* TclGetInstructionTable --
*
* Returns a pointer to the table describing Tcl bytecode instructions.
* This procedure is defined so that clients can access the pointer from
* outside the TCL DLLs.
*
* Results:
* Returns a pointer to the global instruction table, same as the
* expression (&tclInstructionTable[0]).
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
const void * /* == InstructionDesc* == */
TclGetInstructionTable(void)
{
return &tclInstructionTable[0];
}
/*
*----------------------------------------------------------------------
*
* GetCmdLocEncodingSize --
*
* Computes the total number of bytes needed to encode the command
* location information for some compiled code.
*
* Results:
* The byte count needed to encode the compiled location information.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
GetCmdLocEncodingSize(
CompileEnv *envPtr) /* Points to compilation environment structure
* containing the CmdLocation structure to
* encode. */
{
CmdLocation *mapPtr = envPtr->cmdMapPtr;
int numCmds = envPtr->numCommands;
int codeDelta, codeLen, srcDelta, srcLen;
int codeDeltaNext, codeLengthNext, srcDeltaNext, srcLengthNext;
/* The offsets in their respective byte
* sequences where the next encoded offset or
* length should go. */
int prevCodeOffset, prevSrcOffset, i;
codeDeltaNext = codeLengthNext = srcDeltaNext = srcLengthNext = 0;
prevCodeOffset = prevSrcOffset = 0;
for (i = 0; i < numCmds; i++) {
codeDelta = mapPtr[i].codeOffset - prevCodeOffset;
if (codeDelta < 0) {
Tcl_Panic("GetCmdLocEncodingSize: bad code offset");
} else if (codeDelta <= 127) {
codeDeltaNext++;
} else {
codeDeltaNext += 5; /* 1 byte for 0xFF, 4 for positive delta */
}
prevCodeOffset = mapPtr[i].codeOffset;
codeLen = mapPtr[i].numCodeBytes;
if (codeLen < 0) {
Tcl_Panic("GetCmdLocEncodingSize: bad code length");
} else if (codeLen <= 127) {
codeLengthNext++;
} else {
codeLengthNext += 5;/* 1 byte for 0xFF, 4 for length */
}
srcDelta = mapPtr[i].srcOffset - prevSrcOffset;
if ((-127 <= srcDelta) && (srcDelta <= 127) && (srcDelta != -1)) {
srcDeltaNext++;
} else {
srcDeltaNext += 5; /* 1 byte for 0xFF, 4 for delta */
}
prevSrcOffset = mapPtr[i].srcOffset;
srcLen = mapPtr[i].numSrcBytes;
if (srcLen < 0) {
Tcl_Panic("GetCmdLocEncodingSize: bad source length");
} else if (srcLen <= 127) {
srcLengthNext++;
} else {
srcLengthNext += 5; /* 1 byte for 0xFF, 4 for length */
}
}
return (codeDeltaNext + codeLengthNext + srcDeltaNext + srcLengthNext);
}
/*
*----------------------------------------------------------------------
*
* EncodeCmdLocMap --
*
* Encode the command location information for some compiled code into a
* ByteCode structure. The encoded command location map is stored as
* three adjacent byte sequences.
*
* Results:
* Pointer to the first byte after the encoded command location
* information.
*
* Side effects:
* The encoded information is stored into the block of memory headed by
* codePtr. Also records pointers to the start of the four byte sequences
* in fields in codePtr's ByteCode header structure.
*
*----------------------------------------------------------------------
*/
static unsigned char *
EncodeCmdLocMap(
CompileEnv *envPtr, /* Points to compilation environment structure
* containing the CmdLocation structure to
* encode. */
ByteCode *codePtr, /* ByteCode in which to encode envPtr's
* command location information. */
unsigned char *startPtr) /* Points to the first byte in codePtr's
* memory block where the location information
* is to be stored. */
{
CmdLocation *mapPtr = envPtr->cmdMapPtr;
int numCmds = envPtr->numCommands;
unsigned char *p = startPtr;
int codeDelta, codeLen, srcDelta, srcLen, prevOffset;
int i;
/*
* Encode the code offset for each command as a sequence of deltas.
*/
codePtr->codeDeltaStart = p;
prevOffset = 0;
for (i = 0; i < numCmds; i++) {
codeDelta = mapPtr[i].codeOffset - prevOffset;
if (codeDelta < 0) {
Tcl_Panic("EncodeCmdLocMap: bad code offset");
} else if (codeDelta <= 127) {
TclStoreInt1AtPtr(codeDelta, p);
p++;
} else {
TclStoreInt1AtPtr(0xFF, p);
p++;
TclStoreInt4AtPtr(codeDelta, p);
p += 4;
}
prevOffset = mapPtr[i].codeOffset;
}
/*
* Encode the code length for each command.
*/
codePtr->codeLengthStart = p;
for (i = 0; i < numCmds; i++) {
codeLen = mapPtr[i].numCodeBytes;
if (codeLen < 0) {
Tcl_Panic("EncodeCmdLocMap: bad code length");
} else if (codeLen <= 127) {
TclStoreInt1AtPtr(codeLen, p);
p++;
} else {
TclStoreInt1AtPtr(0xFF, p);
p++;
TclStoreInt4AtPtr(codeLen, p);
p += 4;
}
}
/*
* Encode the source offset for each command as a sequence of deltas.
*/
codePtr->srcDeltaStart = p;
prevOffset = 0;
for (i = 0; i < numCmds; i++) {
srcDelta = mapPtr[i].srcOffset - prevOffset;
if ((-127 <= srcDelta) && (srcDelta <= 127) && (srcDelta != -1)) {
TclStoreInt1AtPtr(srcDelta, p);
p++;
} else {
TclStoreInt1AtPtr(0xFF, p);
p++;
TclStoreInt4AtPtr(srcDelta, p);
p += 4;
}
prevOffset = mapPtr[i].srcOffset;
}
/*
* Encode the source length for each command.
*/
codePtr->srcLengthStart = p;
for (i = 0; i < numCmds; i++) {
srcLen = mapPtr[i].numSrcBytes;
if (srcLen < 0) {
Tcl_Panic("EncodeCmdLocMap: bad source length");
} else if (srcLen <= 127) {
TclStoreInt1AtPtr(srcLen, p);
p++;
} else {
TclStoreInt1AtPtr(0xFF, p);
p++;
TclStoreInt4AtPtr(srcLen, p);
p += 4;
}
}
return p;
}
#ifdef TCL_COMPILE_STATS
/*
*----------------------------------------------------------------------
*
* RecordByteCodeStats --
*
* Accumulates various compilation-related statistics for each newly
* compiled ByteCode. Called by the TclInitByteCodeObj when Tcl is
* compiled with the -DTCL_COMPILE_STATS flag
*
* Results:
* None.
*
* Side effects:
* Accumulates aggregate code-related statistics in the interpreter's
* ByteCodeStats structure. Records statistics specific to a ByteCode in
* its ByteCode structure.
*
*----------------------------------------------------------------------
*/
void
RecordByteCodeStats(
ByteCode *codePtr) /* Points to ByteCode structure with info
* to add to accumulated statistics. */
{
Interp *iPtr = (Interp *) *codePtr->interpHandle;
ByteCodeStats *statsPtr;
if (iPtr == NULL) {
/* Avoid segfaulting in case we're called in a deleted interp */
return;
}
statsPtr = &(iPtr->stats);
statsPtr->numCompilations++;
statsPtr->totalSrcBytes += (double) codePtr->numSrcBytes;
statsPtr->totalByteCodeBytes += (double) codePtr->structureSize;
statsPtr->currentSrcBytes += (double) codePtr->numSrcBytes;
statsPtr->currentByteCodeBytes += (double) codePtr->structureSize;
statsPtr->srcCount[TclLog2(codePtr->numSrcBytes)]++;
statsPtr->byteCodeCount[TclLog2((int) codePtr->structureSize)]++;
statsPtr->currentInstBytes += (double) codePtr->numCodeBytes;
statsPtr->currentLitBytes += (double)
codePtr->numLitObjects * sizeof(Tcl_Obj *);
statsPtr->currentExceptBytes += (double)
codePtr->numExceptRanges * sizeof(ExceptionRange);
statsPtr->currentAuxBytes += (double)
codePtr->numAuxDataItems * sizeof(AuxData);
statsPtr->currentCmdMapBytes += (double) codePtr->numCmdLocBytes;
}
#endif /* TCL_COMPILE_STATS */
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* tab-width: 8
* End:
*/
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