Commit Graph

456 Commits

Author SHA1 Message Date
Dag Lem a862642fac Correct interpretation of SystemVerilog C-style array dimensions
IEEE Std 1800™-2017 7.4.2 specifies that [size] is the same as [0:size-1].
2022-11-13 07:41:25 +01:00
Miodrag Milanovic b76c72056b set default_nettype to wire for resetall 2022-08-10 13:28:19 +02:00
Miodrag Milanovic 545a3417c8 resetall does not affect text defines, but undefineall does 2022-08-10 11:38:50 +02:00
Zachary Snow 15a4e900b2 verilog: support for time scale delay values 2022-02-14 15:58:31 +01:00
Thomas Sailer 4cd2f03e36 preprocessor: do not destroy double slash escaped identifiers
The preprocessor currently destroys double slash containing escaped
identifiers (for example \a//b ). This is due to next_token trying to
convert single line comments (//) into /* */ comments. This then leads
to an unintuitive error message like this:
ERROR: syntax error, unexpected '*'

This patch fixes the error by recognizing escaped identifiers and
returning them as single token. It also adds a testcase.
2021-12-15 18:06:02 -07:00
Zachary Snow fbd70f28f0 Specify minimum bison version 3.0+
Yosys works with bison 3.0 (or newer), but not bison 2.7 (the previous
release). Ideally, we would require "3" rather than "3.0" to give a
better error message, but bison 2.3, which still ships with macOS, does
not support major-only version requirements. With this change, building
with an outdated bison yields: `frontends/rtlil/rtlil_parser.y:25.10-14:
require bison 3.0, but have 2.3`.
2021-10-01 21:18:33 -06:00
Claire Xen 0146d83ed8
Merge pull request #3014 from YosysHQ/claire/fix-vgtest
Fix "make vgtest"
2021-09-24 17:50:34 +02:00
Zachary Snow 9658d2e337 Fix TOK_ID memory leak in for_initialization 2021-09-23 13:33:55 -04:00
Zachary Snow d6fe6d4fb6 sv: support wand and wor of data types
This enables the usage of declarations of wand or wor with a base type
of logic, integer, or a typename. Note that declarations of nets with
2-state base types is still permitted, in violation of the spec.
2021-09-21 14:52:28 -04:00
Zachary Snow 6b7267b849 verilog: fix multiple AST_PREFIX scope resolution issues
- Root AST_PREFIX nodes are now subject to genblk expansion to allow
  them to refer to a locally-visible generate block
- Part selects on AST_PREFIX member leafs can now refer to generate
  block items (previously would not resolve and raise an error)
- Add source location information to AST_PREFIX nodes
2021-09-21 12:10:59 -04:00
Marcelina Kościelnicka 551ef85cd7 verilog: Squash flex-triggered warning. 2021-09-13 18:58:17 +02:00
Zachary Snow b2e9717419 sv: support declaration in generate for initialization
This is accomplished by generating a unique name for the genvar,
renaming references to the genvar only in the loop's initialization,
guard, and incrementation, and finally adding a localparam inside the
loop body with the original name so that the genvar can be shadowed as
expected.
2021-08-31 12:34:55 -06:00
Zachary Snow f0a52e3dd2 sv: support declaration in procedural for initialization
In line with other tools, this adds an extra wrapping block around such
for loops to appropriately scope the variable.
2021-08-30 15:19:21 -06:00
Brett Witherspoon 979053855c sv: improve support for wire and var with user-defined types
- User-defined types must be data types. Using a net type (e.g. wire) is
  a syntax error.
- User-defined types without a net type are always variables (i.e.
  logic).
- Nets and variables can now be explicitly declared using user-defined
  types:

    typedef logic [1:0] W;
    wire W w;

    typedef logic [1:0] V;
    var V v;

Fixes #2846
2021-08-12 22:41:41 -06:00
Michael Singer 681a1c07e5 Allow optional comma after last entry in enum 2021-08-09 22:25:57 -06:00
Marcelina Kościelnicka 52cbf1bea5 verilog: Support tri/triand/trior wire types.
These are, by the standard, just aliases for wire/wand/wor.

Fixes #2918.
2021-08-06 21:35:43 +02:00
Zachary Snow 3156226233 verilog: save and restore overwritten macro arguments 2021-07-28 21:52:16 -04:00
Rupert Swarbrick 414154dd27 Add support for parsing the SystemVerilog 'bind' construct
This doesn't do anything useful yet: the patch just adds support for
the syntax to the lexer and parser and adds some tests to check the
syntax parses properly. This generates AST nodes, but doesn't yet
generate RTLIL.

Since our existing hierarchical_identifier parser doesn't allow bit
selects (so you can't do something like foo[1].bar[2].baz), I've also
not added support for a trailing bit select (the "constant_bit_select"
non-terminal in "bind_target_instance" in the spec). If we turn out to
need this in future, we'll want to augment hierarchical_identifier and
its other users too.

Note that you can't easily use the BNF from the spec:

    bind_directive ::=
        "bind" bind_target_scope [ : bind_target_instance_list]
               bind_instantiation ;
      | "bind" bind_target_instance bind_instantiation ;

even if you fix the lookahead problem, because code like this matches
both branches in the BNF:

    bind a b b_i (.*);

The problem is that 'a' could either be a module name or a degenerate
hierarchical reference. This seems to be a genuine syntactic
ambiguity, which the spec resolves (p739) by saying that we have to
wait until resolution time (the hierarchy pass) and take whatever is
defined, treating 'a' as an instance name if it names both an instance
and a module.

To keep the parser simple, it currently accepts this invalid syntax:

    bind a.b : c d e (.*);

This is invalid because we're in the first branch of the BNF above, so
the "a.b" term should match bind_target_scope: a module or interface
identifier, not an arbitrary hierarchical identifier.

This will fail in the hierarchy pass (when it's implemented in a
future patch).
2021-07-16 09:31:39 -04:00
Zachary Snow 4446cfa524 sv: fix a few struct and enum memory leaks 2021-07-06 12:15:08 -04:00
Zachary Snow f2c2d73f36 sv: fix up end label checking
- disallow [gen]blocks with an end label but not begin label
- check validity of module end label
- fix memory leak of package name and end label
- fix memory leak of module end label
2021-06-16 21:48:05 -04:00
Xiretza c6681508f1 verilog: fix leaking of type names in parser 2021-06-14 13:56:51 -04:00
Xiretza b57e47fad8 verilog: fix wildcard port connections leaking memory 2021-06-14 13:56:51 -04:00
Xiretza 091295a5a5 verilog: fix leaking ASTNodes 2021-06-14 13:56:51 -04:00
Marcelina Kościelnicka 801ecc0e1d verilog: Squash a memory leak.
That was added in ecc22f7fed
2021-06-14 17:07:41 +02:00
Claire Xenia Wolf 72787f52fc Fixing old e-mail addresses and deadnames
s/((Claire|Xen|Xenia|Clifford)\s+)+(Wolf|Xen)\s+<(claire|clifford)@(symbioticeda.com|clifford.at|yosyshq.com)>/Claire Xenia Wolf <claire@yosyshq.com>/gi;
s/((Nina|Nak|N\.)\s+)+Engelhardt\s+<nak@(symbioticeda.com|yosyshq.com)>/N. Engelhardt <nak@yosyshq.com>/gi;
s/((David)\s+)+Shah\s+<(dave|david)@(symbioticeda.com|yosyshq.com|ds0.me)>/David Shah <dave@ds0.me>/gi;
s/((Miodrag)\s+)+Milanovic\s+<(miodrag|micko)@(symbioticeda.com|yosyshq.com)>/Miodrag Milanovic <micko@yosyshq.com>/gi;
s,https?://www.clifford.at/yosys/,http://yosyshq.net/yosys/,g;
2021-06-08 00:39:36 +02:00
Zachary Snow 8cfed1a979 sv: support tasks and functions within packages 2021-06-01 13:17:41 -04:00
Zachary Snow 15f35d6754 sv: support remaining assignment operators
- Add support for: *=, /=, %=, <<=, >>=, <<<=, >>>=
- Unify existing support for: +=, -=, &=, |=, ^=
2021-05-25 16:15:57 -04:00
Zachary Snow 4452080861 sv: check validity of package end label 2021-05-10 14:37:32 -04:00
Zachary Snow ba2ff1ea98 verilog: revise hot comment warnings 2021-03-30 09:21:18 -04:00
Marcelina Kościelnicka 0505c604e7 preproc: Fix up conditional handling.
Fixes #2710.
Fixes #2711.
2021-03-30 02:29:26 +02:00
Xiretza 92d5550a90 verilog: check entire user type stack for type definition 2021-03-21 19:35:13 -04:00
Zachary Snow 4f4e70876f sv: allow typenames as function return types 2021-03-19 12:08:43 -04:00
Xiretza 0c66141ed2 verilog: rebuild user_type_stack from globals before parsing file
This was actually a ticking UB bomb: after running the parser, the type
maps contain pointers to children of the current AST, which is
recursively deleted after the pass has executed. This leaves the
pointers in user_type_stack dangling, which just happened to never be a
problem due to another bug that causes typedefs from higher-level type
maps to never be considered.

Rebuilding the type stack from the design's globals ensures the AstNode
pointers are valid.
2021-03-18 20:52:36 -04:00
Zachary Snow f71c2dcca6 sv: carry over global typedefs from previous files
This breaks the ability to use a global typename as a standard
identifier in a subsequent input file. This is otherwise backwards
compatible, including for sources which previously included conflicting
typedefs in each input file.
2021-03-17 15:53:52 -04:00
Zachary Snow d738b2c127 sv: support for parameters without default values
- Modules with a parameter without a default value will be automatically
  deferred until the hierarchy pass
- Allows for parameters without defaults as module items, rather than
  just int the `parameter_port_list`, despite being forbidden in the LRM
- Check for parameters without defaults that haven't been overriden
- Add location info to parameter/localparam declarations
2021-03-02 10:43:53 -05:00
Zachary Snow 10a6bc9b81 verilog: fix sizing of ports with int types in module headers
Declaring the ports as standard module items already worked as expected.
This adds a missing usage of `checkRange()` so that headers such as
`module m(output integer x);` now work correctly.
2021-03-01 13:39:05 -05:00
Zachary Snow 1ec5994100 verilog: fix handling of nested ifdef directives
- track depth so we know whether to consider higher-level elsifs
- error on unmatched endif/elsif/else
2021-03-01 12:28:33 -05:00
Claire Xen 004b780b8a
Merge pull request #2523 from tomverbeure/define_synthesis
Add -nosynthesis flag for read_verilog command
2021-03-01 18:00:48 +01:00
Zachary Snow 0f5b646ab8 sv: extended support for integer types
- Standard data declarations can now use any integer type
- Parameters and localparams can now use any integer type
- Function returns types can now use any integer type
- Fix `parameter logic`, `localparam reg`, etc. to be 1 bit (previously 32 bits)
- Added longint type (64 bits)
- Unified parser source for integer type widths
2021-02-28 16:31:56 -05:00
Marcelina Kościelnicka a651204efa Fix handling of unique/unique0/priority cases in the frontend.
Basically:

- priority converts to (* full_case *)
- unique0 converts to (* parallel_case *)
- unique converts to (* parallel_case, full_case *)

Fixes #2596.
2021-02-25 21:53:58 +01:00
TimRudy dcd9f0af23
Extend "delay" expressions to handle pair and triplet, i.e. rise, fall and turn-off (#2566) 2021-02-24 15:48:15 -05:00
Zachary Snow 220cb1f7bb verilog: error on macro invocations with missing argument lists
This would previously complain about an undefined internal macro if the
unapplied macro had not already been used. If it had, it would
incorrectly use the arguments from the previous invocation.
2021-02-19 09:18:41 -05:00
Zachary Snow 73d611990d
Merge pull request #2578 from zachjs/genblk-port
verlog: allow shadowing module ports within generate blocks
2021-02-11 10:26:49 -05:00
Kamil Rakoczy 7533534429 Add missing is_signed to type_atom
Signed-off-by: Kamil Rakoczy <krakoczy@antmicro.com>
2021-02-11 15:05:38 +01:00
Zachary Snow 1d5f3fe506 verlog: allow shadowing module ports within generate blocks
This is a somewhat obscure edge case I encountered while working on test
cases for earlier changes. Declarations in generate blocks should not be
checked against the list of ports. This change also adds a check
forbidding declarations within generate blocks being tagged as inputs or
outputs.
2021-02-07 11:48:39 -05:00
Kamil Rakoczy 98c4feb72f Add check of begin/end labels for genblock
Signed-off-by: Kamil Rakoczy <krakoczy@antmicro.com>
2021-02-04 17:16:30 +01:00
whitequark baf1875307
Merge pull request #2529 from zachjs/unnamed-genblk
verilog: significant block scoping improvements
2021-02-04 09:57:28 +00:00
Zachary Snow fe74b0cd95 verilog: significant block scoping improvements
This change set contains a number of bug fixes and improvements related to
scoping and resolution in generate and procedural blocks. While many of the
frontend changes are interdependent, it may be possible bring the techmap
changes in under a separate PR.

Declarations within unnamed generate blocks previously encountered issues
because the data declarations were left un-prefixed, breaking proper scoping.
The LRM outlines behavior for generating names for unnamed generate blocks. The
original goal was to add this implicit labelling, but doing so exposed a number
of issues downstream. Additional testing highlighted other closely related scope
resolution issues, which have been fixed. This change also adds support for
block item declarations within unnamed blocks in SystemVerilog mode.

1. Unlabled generate blocks are now implicitly named according to the LRM in
   `label_genblks`, which is invoked at the beginning of module elaboration
2. The Verilog parser no longer wraps explicitly named generate blocks in a
   synthetic unnamed generate block to avoid creating extra hierarchy levels
   where they should not exist
3. The techmap phase now allows special control identifiers to be used outside
   of the topmost scope, which is necessary because such wires and cells often
   appear in unlabeled generate blocks, which now prefix the declarations within
4. Some techlibs required modifications because they relied on the previous
   invalid scope resolution behavior
5. `expand_genblock` has been simplified, now only expanding the outermost
   scope, completely deferring the inspection and elaboration of nested scopes;
   names are now resolved by looking in the innermost scope and stepping outward
6. Loop variables now always become localparams during unrolling, allowing them
   to be resolved and shadowed like any other identifier
7. Identifiers in synthetic function call scopes are now prefixed and resolved
   in largely the same manner as other blocks
     before: `$func$\func_01$tests/simple/scopes.blk.v:60$5$\blk\x`
      after: `\func_01$func$tests/simple/scopes.v:60$5.blk.x`
8. Support identifiers referencing a local generate scope nested more
   than 1 level deep, i.e. `B.C.x` while within generate scope `A`, or using a
   prefix of a current or parent scope, i.e. `B.C.D.x` while in `A.B`, `A.B.C`,
   or `A.B.C.D`
9. Variables can now be declared within unnamed blocks in SystemVerilog mode

Addresses the following issues: 656, 2423, 2493
2021-01-31 09:42:09 -05:00
Zachary Snow 27257a419f verilog: strip leading and trailing spaces in macro args 2021-01-28 11:26:35 -05:00
whitequark ffbd813a8c
Merge pull request #2550 from zachjs/macro-arg-spaces
verilog: allow spaces in macro arguments
2021-01-25 10:36:07 +00:00