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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* ---
*
* This is the AST frontend library.
*
* The AST frontend library is not a frontend on it's own but provides a
* generic abstract syntax tree (AST) abstraction for HDL code and can be
* used by HDL frontends. See "ast.h" for an overview of the API and the
* Verilog frontend for an usage example.
*
*/
#include "kernel/yosys.h"
#include "libs/sha1/sha1.h"
#include "ast.h"
YOSYS_NAMESPACE_BEGIN
using namespace AST;
using namespace AST_INTERNAL;
// instanciate global variables (public API)
namespace AST {
std::string current_filename;
void (*set_line_num)(int) = NULL;
int (*get_line_num)() = NULL;
}
// instanciate global variables (private API)
namespace AST_INTERNAL {
bool flag_dump_ast1, flag_dump_ast2, flag_dump_vlog, flag_dump_rtlil, flag_nolatches, flag_nomeminit;
bool flag_nomem2reg, flag_mem2reg, flag_lib, flag_noopt, flag_icells, flag_autowire;
AstNode *current_ast, *current_ast_mod;
std::map<std::string, AstNode*> current_scope;
const dict<RTLIL::SigBit, RTLIL::SigBit> *genRTLIL_subst_ptr = NULL;
RTLIL::SigSpec ignoreThisSignalsInInitial;
AstNode *current_always, *current_top_block, *current_block, *current_block_child;
AstModule *current_module;
bool current_always_clocked;
}
// convert node types to string
std::string AST::type2str(AstNodeType type)
{
switch (type)
{
#define X(_item) case _item: return #_item;
X(AST_NONE)
X(AST_DESIGN)
X(AST_MODULE)
X(AST_TASK)
X(AST_FUNCTION)
X(AST_DPI_FUNCTION)
X(AST_WIRE)
X(AST_MEMORY)
X(AST_AUTOWIRE)
X(AST_PARAMETER)
X(AST_LOCALPARAM)
X(AST_DEFPARAM)
X(AST_PARASET)
X(AST_ARGUMENT)
X(AST_RANGE)
X(AST_MULTIRANGE)
X(AST_CONSTANT)
X(AST_REALVALUE)
X(AST_CELLTYPE)
X(AST_IDENTIFIER)
X(AST_PREFIX)
X(AST_ASSERT)
X(AST_ASSUME)
X(AST_FCALL)
X(AST_TO_BITS)
X(AST_TO_SIGNED)
X(AST_TO_UNSIGNED)
X(AST_CONCAT)
X(AST_REPLICATE)
X(AST_BIT_NOT)
X(AST_BIT_AND)
X(AST_BIT_OR)
X(AST_BIT_XOR)
X(AST_BIT_XNOR)
X(AST_REDUCE_AND)
X(AST_REDUCE_OR)
X(AST_REDUCE_XOR)
X(AST_REDUCE_XNOR)
X(AST_REDUCE_BOOL)
X(AST_SHIFT_LEFT)
X(AST_SHIFT_RIGHT)
X(AST_SHIFT_SLEFT)
X(AST_SHIFT_SRIGHT)
X(AST_LT)
X(AST_LE)
X(AST_EQ)
X(AST_NE)
X(AST_EQX)
X(AST_NEX)
X(AST_GE)
X(AST_GT)
X(AST_ADD)
X(AST_SUB)
X(AST_MUL)
X(AST_DIV)
X(AST_MOD)
X(AST_POW)
X(AST_POS)
X(AST_NEG)
X(AST_LOGIC_AND)
X(AST_LOGIC_OR)
X(AST_LOGIC_NOT)
X(AST_TERNARY)
X(AST_MEMRD)
X(AST_MEMWR)
X(AST_MEMINIT)
X(AST_TCALL)
X(AST_ASSIGN)
X(AST_CELL)
X(AST_PRIMITIVE)
X(AST_CELLARRAY)
X(AST_ALWAYS)
X(AST_INITIAL)
X(AST_BLOCK)
X(AST_ASSIGN_EQ)
X(AST_ASSIGN_LE)
X(AST_CASE)
X(AST_COND)
X(AST_CONDX)
X(AST_CONDZ)
X(AST_DEFAULT)
X(AST_FOR)
X(AST_WHILE)
X(AST_REPEAT)
X(AST_GENVAR)
X(AST_GENFOR)
X(AST_GENIF)
X(AST_GENCASE)
X(AST_GENBLOCK)
X(AST_POSEDGE)
X(AST_NEGEDGE)
X(AST_EDGE)
X(AST_PACKAGE)
#undef X
default:
log_abort();
}
}
// check if attribute exists and has non-zero value
bool AstNode::get_bool_attribute(RTLIL::IdString id)
{
if (attributes.count(id) == 0)
return false;
AstNode *attr = attributes.at(id);
if (attr->type != AST_CONSTANT)
log_error("Attribute `%s' with non-constant value at %s:%d!\n",
id.c_str(), attr->filename.c_str(), attr->linenum);
return attr->integer != 0;
}
// create new node (AstNode constructor)
// (the optional child arguments make it easier to create AST trees)
AstNode::AstNode(AstNodeType type, AstNode *child1, AstNode *child2, AstNode *child3)
{
static unsigned int hashidx_count = 123456789;
hashidx_count = mkhash_xorshift(hashidx_count);
hashidx_ = hashidx_count;
this->type = type;
filename = current_filename;
linenum = get_line_num();
is_input = false;
is_output = false;
is_reg = false;
is_signed = false;
is_string = false;
range_valid = false;
range_swapped = false;
port_id = 0;
range_left = -1;
range_right = 0;
integer = 0;
realvalue = 0;
id2ast = NULL;
basic_prep = false;
if (child1)
children.push_back(child1);
if (child2)
children.push_back(child2);
if (child3)
children.push_back(child3);
}
// create a (deep recursive) copy of a node
AstNode *AstNode::clone()
{
AstNode *that = new AstNode;
*that = *this;
for (auto &it : that->children)
it = it->clone();
for (auto &it : that->attributes)
it.second = it.second->clone();
return that;
}
// create a (deep recursive) copy of a node use 'other' as target root node
void AstNode::cloneInto(AstNode *other)
{
AstNode *tmp = clone();
other->delete_children();
*other = *tmp;
tmp->children.clear();
tmp->attributes.clear();
delete tmp;
}
// delete all children in this node
void AstNode::delete_children()
{
for (auto &it : children)
delete it;
children.clear();
for (auto &it : attributes)
delete it.second;
attributes.clear();
}
// AstNode destructor
AstNode::~AstNode()
{
delete_children();
}
// create a nice text representation of the node
// (traverse tree by recursion, use 'other' pointer for diffing two AST trees)
void AstNode::dumpAst(FILE *f, std::string indent)
{
if (f == NULL) {
for (auto f : log_files)
dumpAst(f, indent);
return;
}
std::string type_name = type2str(type);
fprintf(f, "%s%s <%s:%d>", indent.c_str(), type_name.c_str(), filename.c_str(), linenum);
if (id2ast)
fprintf(f, " [%p -> %p]", this, id2ast);
else
fprintf(f, " [%p]", this);
if (!str.empty())
fprintf(f, " str='%s'", str.c_str());
if (!bits.empty()) {
fprintf(f, " bits='");
for (size_t i = bits.size(); i > 0; i--)
fprintf(f, "%c", bits[i-1] == RTLIL::S0 ? '0' :
bits[i-1] == RTLIL::S1 ? '1' :
bits[i-1] == RTLIL::Sx ? 'x' :
bits[i-1] == RTLIL::Sz ? 'z' : '?');
fprintf(f, "'(%d)", GetSize(bits));
}
if (is_input)
fprintf(f, " input");
if (is_output)
fprintf(f, " output");
if (is_reg)
fprintf(f, " reg");
if (is_signed)
fprintf(f, " signed");
if (port_id > 0)
fprintf(f, " port=%d", port_id);
if (range_valid || range_left != -1 || range_right != 0)
fprintf(f, " %srange=[%d:%d]%s", range_swapped ? "swapped_" : "", range_left, range_right, range_valid ? "" : "!");
if (integer != 0)
fprintf(f, " int=%u", (int)integer);
if (realvalue != 0)
fprintf(f, " real=%e", realvalue);
if (!multirange_dimensions.empty()) {
fprintf(f, " multirange=[");
for (int v : multirange_dimensions)
fprintf(f, " %d", v);
fprintf(f, " ]");
}
fprintf(f, "\n");
for (auto &it : attributes) {
fprintf(f, "%s ATTR %s:\n", indent.c_str(), it.first.c_str());
it.second->dumpAst(f, indent + " ");
}
for (size_t i = 0; i < children.size(); i++)
children[i]->dumpAst(f, indent + " ");
fflush(f);
}
// helper function for AstNode::dumpVlog()
static std::string id2vl(std::string txt)
{
if (txt.size() > 1 && txt[0] == '\\')
txt = txt.substr(1);
for (size_t i = 0; i < txt.size(); i++) {
if ('A' <= txt[i] && txt[i] <= 'Z') continue;
if ('a' <= txt[i] && txt[i] <= 'z') continue;
if ('0' <= txt[i] && txt[i] <= '9') continue;
if (txt[i] == '_') continue;
txt = "\\" + txt + " ";
break;
}
return txt;
}
// dump AST node as Verilog pseudo-code
void AstNode::dumpVlog(FILE *f, std::string indent)
{
bool first = true;
std::string txt;
std::vector<AstNode*> rem_children1, rem_children2;
if (f == NULL) {
for (auto f : log_files)
dumpVlog(f, indent);
return;
}
for (auto &it : attributes) {
fprintf(f, "%s" "(* %s = ", indent.c_str(), id2vl(it.first.str()).c_str());
it.second->dumpVlog(f, "");
fprintf(f, " *)%s", indent.empty() ? "" : "\n");
}
switch (type)
{
case AST_MODULE:
fprintf(f, "%s" "module %s(", indent.c_str(), id2vl(str).c_str());
for (auto child : children)
if (child->type == AST_WIRE && (child->is_input || child->is_output)) {
fprintf(f, "%s%s", first ? "" : ", ", id2vl(child->str).c_str());
first = false;
}
fprintf(f, ");\n");
for (auto child : children)
if (child->type == AST_PARAMETER || child->type == AST_LOCALPARAM || child->type == AST_DEFPARAM)
child->dumpVlog(f, indent + " ");
else
rem_children1.push_back(child);
for (auto child : rem_children1)
if (child->type == AST_WIRE || child->type == AST_AUTOWIRE || child->type == AST_MEMORY)
child->dumpVlog(f, indent + " ");
else
rem_children2.push_back(child);
rem_children1.clear();
for (auto child : rem_children2)
if (child->type == AST_TASK || child->type == AST_FUNCTION)
child->dumpVlog(f, indent + " ");
else
rem_children1.push_back(child);
rem_children2.clear();
for (auto child : rem_children1)
child->dumpVlog(f, indent + " ");
rem_children1.clear();
fprintf(f, "%s" "endmodule\n", indent.c_str());
break;
case AST_WIRE:
if (is_input && is_output)
fprintf(f, "%s" "inout", indent.c_str());
else if (is_input)
fprintf(f, "%s" "input", indent.c_str());
else if (is_output)
fprintf(f, "%s" "output", indent.c_str());
else if (!is_reg)
fprintf(f, "%s" "wire", indent.c_str());
if (is_reg)
fprintf(f, "%s" "reg", (is_input || is_output) ? " " : indent.c_str());
if (is_signed)
fprintf(f, " signed");
for (auto child : children) {
fprintf(f, " ");
child->dumpVlog(f, "");
}
fprintf(f, " %s", id2vl(str).c_str());
fprintf(f, ";\n");
break;
case AST_MEMORY:
fprintf(f, "%s" "memory", indent.c_str());
if (is_signed)
fprintf(f, " signed");
for (auto child : children) {
fprintf(f, " ");
child->dumpVlog(f, "");
if (first)
fprintf(f, " %s", id2vl(str).c_str());
first = false;
}
fprintf(f, ";\n");
break;
case AST_RANGE:
if (range_valid)
fprintf(f, "[%d:%d]", range_left, range_right);
else {
for (auto child : children) {
fprintf(f, "%c", first ? '[' : ':');
child->dumpVlog(f, "");
first = false;
}
fprintf(f, "]");
}
break;
case AST_ALWAYS:
fprintf(f, "%s" "always @", indent.c_str());
for (auto child : children) {
if (child->type != AST_POSEDGE && child->type != AST_NEGEDGE && child->type != AST_EDGE)
continue;
fprintf(f, first ? "(" : ", ");
child->dumpVlog(f, "");
first = false;
}
fprintf(f, first ? "*\n" : ")\n");
for (auto child : children) {
if (child->type != AST_POSEDGE && child->type != AST_NEGEDGE && child->type != AST_EDGE)
child->dumpVlog(f, indent + " ");
}
break;
case AST_INITIAL:
fprintf(f, "%s" "initial\n", indent.c_str());
for (auto child : children) {
if (child->type != AST_POSEDGE && child->type != AST_NEGEDGE && child->type != AST_EDGE)
child->dumpVlog(f, indent + " ");
}
break;
case AST_POSEDGE:
case AST_NEGEDGE:
case AST_EDGE:
if (type == AST_POSEDGE)
fprintf(f, "posedge ");
if (type == AST_NEGEDGE)
fprintf(f, "negedge ");
for (auto child : children)
child->dumpVlog(f, "");
break;
case AST_IDENTIFIER:
fprintf(f, "%s", id2vl(str).c_str());
for (auto child : children)
child->dumpVlog(f, "");
break;
case AST_CONSTANT:
if (!str.empty())
fprintf(f, "\"%s\"", str.c_str());
else if (bits.size() == 32)
fprintf(f, "%d", RTLIL::Const(bits).as_int());
else
fprintf(f, "%d'b %s", GetSize(bits), RTLIL::Const(bits).as_string().c_str());
break;
case AST_REALVALUE:
fprintf(f, "%e", realvalue);
break;
case AST_BLOCK:
if (children.size() == 1) {
children[0]->dumpVlog(f, indent);
} else {
fprintf(f, "%s" "begin\n", indent.c_str());
for (auto child : children)
child->dumpVlog(f, indent + " ");
fprintf(f, "%s" "end\n", indent.c_str());
}
break;
case AST_CASE:
if (!children.empty() && children[0]->type == AST_CONDX)
fprintf(f, "%s" "casex (", indent.c_str());
else if (!children.empty() && children[0]->type == AST_CONDZ)
fprintf(f, "%s" "casez (", indent.c_str());
else
fprintf(f, "%s" "case (", indent.c_str());
children[0]->dumpVlog(f, "");
fprintf(f, ")\n");
for (size_t i = 1; i < children.size(); i++) {
AstNode *child = children[i];
child->dumpVlog(f, indent + " ");
}
fprintf(f, "%s" "endcase\n", indent.c_str());
break;
case AST_COND:
case AST_CONDX:
case AST_CONDZ:
for (auto child : children) {
if (child->type == AST_BLOCK) {
fprintf(f, ":\n");
child->dumpVlog(f, indent + " ");
first = true;
} else {
fprintf(f, "%s", first ? indent.c_str() : ", ");
if (child->type == AST_DEFAULT)
fprintf(f, "default");
else
child->dumpVlog(f, "");
first = false;
}
}
break;
case AST_ASSIGN:
fprintf(f, "%sassign ", indent.c_str());
children[0]->dumpVlog(f, "");
fprintf(f, " = ");
children[1]->dumpVlog(f, "");
fprintf(f, ";\n");
break;
case AST_ASSIGN_EQ:
case AST_ASSIGN_LE:
fprintf(f, "%s", indent.c_str());
children[0]->dumpVlog(f, "");
fprintf(f, " %s ", type == AST_ASSIGN_EQ ? "=" : "<=");
children[1]->dumpVlog(f, "");
fprintf(f, ";\n");
break;
case AST_CONCAT:
fprintf(f, "{");
for (auto child : children) {
if (!first)
fprintf(f, ", ");
child->dumpVlog(f, "");
first = false;
}
fprintf(f, "}");
break;
case AST_REPLICATE:
fprintf(f, "{");
children[0]->dumpVlog(f, "");
fprintf(f, "{");
children[1]->dumpVlog(f, "");
fprintf(f, "}}");
break;
if (0) { case AST_BIT_NOT: txt = "~"; }
if (0) { case AST_REDUCE_AND: txt = "&"; }
if (0) { case AST_REDUCE_OR: txt = "|"; }
if (0) { case AST_REDUCE_XOR: txt = "^"; }
if (0) { case AST_REDUCE_XNOR: txt = "~^"; }
if (0) { case AST_REDUCE_BOOL: txt = "|"; }
if (0) { case AST_POS: txt = "+"; }
if (0) { case AST_NEG: txt = "-"; }
if (0) { case AST_LOGIC_NOT: txt = "!"; }
fprintf(f, "%s(", txt.c_str());
children[0]->dumpVlog(f, "");
fprintf(f, ")");
break;
if (0) { case AST_BIT_AND: txt = "&"; }
if (0) { case AST_BIT_OR: txt = "|"; }
if (0) { case AST_BIT_XOR: txt = "^"; }
if (0) { case AST_BIT_XNOR: txt = "~^"; }
if (0) { case AST_SHIFT_LEFT: txt = "<<"; }
if (0) { case AST_SHIFT_RIGHT: txt = ">>"; }
if (0) { case AST_SHIFT_SLEFT: txt = "<<<"; }
if (0) { case AST_SHIFT_SRIGHT: txt = ">>>"; }
if (0) { case AST_LT: txt = "<"; }
if (0) { case AST_LE: txt = "<="; }
if (0) { case AST_EQ: txt = "=="; }
if (0) { case AST_NE: txt = "!="; }
if (0) { case AST_EQX: txt = "==="; }
if (0) { case AST_NEX: txt = "!=="; }
if (0) { case AST_GE: txt = ">="; }
if (0) { case AST_GT: txt = ">"; }
if (0) { case AST_ADD: txt = "+"; }
if (0) { case AST_SUB: txt = "-"; }
if (0) { case AST_MUL: txt = "*"; }
if (0) { case AST_DIV: txt = "/"; }
if (0) { case AST_MOD: txt = "%"; }
if (0) { case AST_POW: txt = "**"; }
if (0) { case AST_LOGIC_AND: txt = "&&"; }
if (0) { case AST_LOGIC_OR: txt = "||"; }
fprintf(f, "(");
children[0]->dumpVlog(f, "");
fprintf(f, ")%s(", txt.c_str());
children[1]->dumpVlog(f, "");
fprintf(f, ")");
break;
case AST_TERNARY:
fprintf(f, "(");
children[0]->dumpVlog(f, "");
fprintf(f, ") ? (");
children[1]->dumpVlog(f, "");
fprintf(f, ") : (");
children[2]->dumpVlog(f, "");
fprintf(f, ")");
break;
default:
std::string type_name = type2str(type);
fprintf(f, "%s" "/** %s **/%s", indent.c_str(), type_name.c_str(), indent.empty() ? "" : "\n");
// dumpAst(f, indent, NULL);
}
fflush(f);
}
// check if two AST nodes are identical
bool AstNode::operator==(const AstNode &other) const
{
if (type != other.type)
return false;
if (children.size() != other.children.size())
return false;
if (str != other.str)
return false;
if (bits != other.bits)
return false;
if (is_input != other.is_input)
return false;
if (is_output != other.is_output)
return false;
if (is_reg != other.is_reg)
return false;
if (is_signed != other.is_signed)
return false;
if (is_string != other.is_string)
return false;
if (range_valid != other.range_valid)
return false;
if (range_swapped != other.range_swapped)
return false;
if (port_id != other.port_id)
return false;
if (range_left != other.range_left)
return false;
if (range_right != other.range_right)
return false;
if (integer != other.integer)
return false;
for (size_t i = 0; i < children.size(); i++)
if (*children[i] != *other.children[i])
return false;
return true;
}
// check if two AST nodes are not identical
bool AstNode::operator!=(const AstNode &other) const
{
return !(*this == other);
}
// check if this AST contains the given node
bool AstNode::contains(const AstNode *other) const
{
if (this == other)
return true;
for (auto child : children)
if (child->contains(other))
return true;
return false;
}
// create an AST node for a constant (using a 32 bit int as value)
AstNode *AstNode::mkconst_int(uint32_t v, bool is_signed, int width)
{
AstNode *node = new AstNode(AST_CONSTANT);
node->integer = v;
node->is_signed = is_signed;
for (int i = 0; i < width; i++) {
node->bits.push_back((v & 1) ? RTLIL::S1 : RTLIL::S0);
v = v >> 1;
}
node->range_valid = true;
node->range_left = width-1;
node->range_right = 0;
return node;
}
// create an AST node for a constant (using a bit vector as value)
AstNode *AstNode::mkconst_bits(const std::vector<RTLIL::State> &v, bool is_signed)
{
AstNode *node = new AstNode(AST_CONSTANT);
node->is_signed = is_signed;
node->bits = v;
for (size_t i = 0; i < 32; i++) {
if (i < node->bits.size())
node->integer |= (node->bits[i] == RTLIL::S1) << i;
else if (is_signed && !node->bits.empty())
node->integer |= (node->bits.back() == RTLIL::S1) << i;
}
node->range_valid = true;
node->range_left = node->bits.size()-1;
node->range_right = 0;
return node;
}
// create an AST node for a constant (using a string in bit vector form as value)
AstNode *AstNode::mkconst_str(const std::vector<RTLIL::State> &v)
{
AstNode *node = mkconst_str(RTLIL::Const(v).decode_string());
while (GetSize(node->bits) < GetSize(v))
node->bits.push_back(RTLIL::State::S0);
log_assert(node->bits == v);
return node;
}
// create an AST node for a constant (using a string as value)
AstNode *AstNode::mkconst_str(const std::string &str)
{
std::vector<RTLIL::State> data;
data.reserve(str.size() * 8);
for (size_t i = 0; i < str.size(); i++) {
unsigned char ch = str[str.size() - i - 1];
for (int j = 0; j < 8; j++) {
data.push_back((ch & 1) ? RTLIL::S1 : RTLIL::S0);
ch = ch >> 1;
}
}
AstNode *node = AstNode::mkconst_bits(data, false);
node->is_string = true;
node->str = str;
return node;
}
bool AstNode::bits_only_01()
{
for (auto bit : bits)
if (bit != RTLIL::S0 && bit != RTLIL::S1)
return false;
return true;
}
RTLIL::Const AstNode::bitsAsConst(int width, bool is_signed)
{
std::vector<RTLIL::State> bits = this->bits;
if (width >= 0 && width < int(bits.size()))
bits.resize(width);
if (width >= 0 && width > int(bits.size())) {
RTLIL::State extbit = RTLIL::State::S0;
if (is_signed && !bits.empty())
extbit = bits.back();
while (width > int(bits.size()))
bits.push_back(extbit);
}
return RTLIL::Const(bits);
}
RTLIL::Const AstNode::bitsAsConst(int width)
{
return bitsAsConst(width, is_signed);
}
RTLIL::Const AstNode::asAttrConst()
{
log_assert(type == AST_CONSTANT);
RTLIL::Const val;
val.bits = bits;
if (is_string) {
val.flags |= RTLIL::CONST_FLAG_STRING;
log_assert(val.decode_string() == str);
}
return val;
}
RTLIL::Const AstNode::asParaConst()
{
RTLIL::Const val = asAttrConst();
if (is_signed)
val.flags |= RTLIL::CONST_FLAG_SIGNED;
return val;
}
bool AstNode::asBool()
{
log_assert(type == AST_CONSTANT);
for (auto &bit : bits)
if (bit == RTLIL::State::S1)
return true;
return false;
}
int AstNode::isConst()
{
if (type == AST_CONSTANT)
return 1;
if (type == AST_REALVALUE)
return 2;
return 0;
}
uint64_t AstNode::asInt(bool is_signed)
{
if (type == AST_CONSTANT)
{
RTLIL::Const v = bitsAsConst(64, is_signed);
uint64_t ret = 0;
for (int i = 0; i < 64; i++)
if (v.bits.at(i) == RTLIL::State::S1)
ret |= uint64_t(1) << i;
return ret;
}
if (type == AST_REALVALUE)
return uint64_t(realvalue);
log_abort();
}
double AstNode::asReal(bool is_signed)
{
if (type == AST_CONSTANT)
{
RTLIL::Const val(bits);
bool is_negative = is_signed && !val.bits.empty() && val.bits.back() == RTLIL::State::S1;
if (is_negative)
val = const_neg(val, val, false, false, val.bits.size());
double v = 0;
for (size_t i = 0; i < val.bits.size(); i++)
// IEEE Std 1800-2012 Par 6.12.2: Individual bits that are x or z in
// the net or the variable shall be treated as zero upon conversion.
if (val.bits.at(i) == RTLIL::State::S1)
v += exp2(i);
if (is_negative)
v *= -1;
return v;
}
if (type == AST_REALVALUE)
return realvalue;
log_abort();
}
RTLIL::Const AstNode::realAsConst(int width)
{
double v = round(realvalue);
RTLIL::Const result;
#ifdef EMSCRIPTEN
if (!isfinite(v)) {
#else
if (!std::isfinite(v)) {
#endif
result.bits = std::vector<RTLIL::State>(width, RTLIL::State::Sx);
} else {
bool is_negative = v < 0;
if (is_negative)
v *= -1;
for (int i = 0; i < width; i++, v /= 2)
result.bits.push_back((fmod(floor(v), 2) != 0) ? RTLIL::State::S1 : RTLIL::State::S0);
if (is_negative)
result = const_neg(result, result, false, false, result.bits.size());
}
return result;
}
// create a new AstModule from an AST_MODULE AST node
static AstModule* process_module(AstNode *ast, bool defer)
{
log_assert(ast->type == AST_MODULE);
if (defer)
log("Storing AST representation for module `%s'.\n", ast->str.c_str());
else
log("Generating RTLIL representation for module `%s'.\n", ast->str.c_str());
current_module = new AstModule;
current_module->ast = NULL;
current_module->name = ast->str;
current_module->attributes["\\src"] = stringf("%s:%d", ast->filename.c_str(), ast->linenum);
current_ast_mod = ast;
AstNode *ast_before_simplify = ast->clone();
if (flag_dump_ast1) {
log("Dumping Verilog AST before simplification:\n");
ast->dumpAst(NULL, " ");
log("--- END OF AST DUMP ---\n");
}
if (!defer)
{
while (ast->simplify(!flag_noopt, false, false, 0, -1, false, false)) { }
if (flag_dump_ast2) {
log("Dumping Verilog AST after simplification:\n");
ast->dumpAst(NULL, " ");
log("--- END OF AST DUMP ---\n");
}
if (flag_dump_vlog) {
log("Dumping Verilog AST (as requested by dump_vlog option):\n");
ast->dumpVlog(NULL, " ");
log("--- END OF AST DUMP ---\n");
}
if (flag_lib) {
std::vector<AstNode*> new_children;
for (auto child : ast->children) {
if (child->type == AST_WIRE && (child->is_input || child->is_output))
new_children.push_back(child);
else
delete child;
}
ast->children.swap(new_children);
ast->attributes["\\blackbox"] = AstNode::mkconst_int(1, false);
}
ignoreThisSignalsInInitial = RTLIL::SigSpec();
for (auto &attr : ast->attributes) {
if (attr.second->type != AST_CONSTANT)
log_error("Attribute `%s' with non-constant value at %s:%d!\n",
attr.first.c_str(), ast->filename.c_str(), ast->linenum);
current_module->attributes[attr.first] = attr.second->asAttrConst();
}
for (size_t i = 0; i < ast->children.size(); i++) {
AstNode *node = ast->children[i];
if (node->type == AST_WIRE || node->type == AST_MEMORY)
node->genRTLIL();
}
for (size_t i = 0; i < ast->children.size(); i++) {
AstNode *node = ast->children[i];
if (node->type != AST_WIRE && node->type != AST_MEMORY && node->type != AST_INITIAL)
node->genRTLIL();
}
ignoreThisSignalsInInitial.sort_and_unify();
for (size_t i = 0; i < ast->children.size(); i++) {
AstNode *node = ast->children[i];
if (node->type == AST_INITIAL)
node->genRTLIL();
}
ignoreThisSignalsInInitial = RTLIL::SigSpec();
}
current_module->ast = ast_before_simplify;
current_module->nolatches = flag_nolatches;
current_module->nomeminit = flag_nomeminit;
current_module->nomem2reg = flag_nomem2reg;
current_module->mem2reg = flag_mem2reg;
current_module->lib = flag_lib;
current_module->noopt = flag_noopt;
current_module->icells = flag_icells;
current_module->autowire = flag_autowire;
current_module->fixup_ports();
if (flag_dump_rtlil) {
log("Dumping generated RTLIL:\n");
log_module(current_module);
log("--- END OF RTLIL DUMP ---\n");
}
return current_module;
}
// create AstModule instances for all modules in the AST tree and add them to 'design'
void AST::process(RTLIL::Design *design, AstNode *ast, bool dump_ast1, bool dump_ast2, bool dump_vlog, bool dump_rtlil,
bool nolatches, bool nomeminit, bool nomem2reg, bool mem2reg, bool lib, bool noopt, bool icells, bool ignore_redef, bool defer, bool autowire)
{
current_ast = ast;
flag_dump_ast1 = dump_ast1;
flag_dump_ast2 = dump_ast2;
flag_dump_vlog = dump_vlog;
flag_dump_rtlil = dump_rtlil;
flag_nolatches = nolatches;
flag_nomeminit = nomeminit;
flag_nomem2reg = nomem2reg;
flag_mem2reg = mem2reg;
flag_lib = lib;
flag_noopt = noopt;
flag_icells = icells;
flag_autowire = autowire;
std::vector<AstNode*> global_decls;
log_assert(current_ast->type == AST_DESIGN);
for (auto it = current_ast->children.begin(); it != current_ast->children.end(); it++)
{
if ((*it)->type == AST_MODULE)
{
for (auto n : global_decls)
(*it)->children.push_back(n->clone());
for (auto n : design->verilog_packages){
for (auto o : n->children) {
AstNode *cloned_node = o->clone();
cloned_node->str = n->str + std::string("::") + cloned_node->str.substr(1);
(*it)->children.push_back(cloned_node);
}
}
if (flag_icells && (*it)->str.substr(0, 2) == "\\$")
(*it)->str = (*it)->str.substr(1);
if (defer)
(*it)->str = "$abstract" + (*it)->str;
if (design->has((*it)->str)) {
if (!ignore_redef)
log_error("Re-definition of module `%s' at %s:%d!\n",
(*it)->str.c_str(), (*it)->filename.c_str(), (*it)->linenum);
log("Ignoring re-definition of module `%s' at %s:%d!\n",
(*it)->str.c_str(), (*it)->filename.c_str(), (*it)->linenum);
continue;
}
design->add(process_module(*it, defer));
}
else if ((*it)->type == AST_PACKAGE)
design->verilog_packages.push_back((*it)->clone());
else
global_decls.push_back(*it);
}
}
// AstModule destructor
AstModule::~AstModule()
{
if (ast != NULL)
delete ast;
}
// create a new parametric module (when needed) and return the name of the generated module
RTLIL::IdString AstModule::derive(RTLIL::Design *design, dict<RTLIL::IdString, RTLIL::Const> parameters)
{
std::string stripped_name = name.str();
if (stripped_name.substr(0, 9) == "$abstract")
stripped_name = stripped_name.substr(9);
log_header(design, "Executing AST frontend in derive mode using pre-parsed AST for module `%s'.\n", stripped_name.c_str());
current_ast = NULL;
flag_dump_ast1 = false;
flag_dump_ast2 = false;
flag_dump_vlog = false;
flag_nolatches = nolatches;
flag_nomeminit = nomeminit;
flag_nomem2reg = nomem2reg;
flag_mem2reg = mem2reg;
flag_lib = lib;
flag_noopt = noopt;
flag_icells = icells;
flag_autowire = autowire;
use_internal_line_num();
std::string para_info;
AstNode *new_ast = ast->clone();
int para_counter = 0;
int orig_parameters_n = parameters.size();
for (auto it = new_ast->children.begin(); it != new_ast->children.end(); it++) {
AstNode *child = *it;
if (child->type != AST_PARAMETER)
continue;
para_counter++;
std::string para_id = child->str;
if (parameters.count(para_id) > 0) {
log("Parameter %s = %s\n", child->str.c_str(), log_signal(RTLIL::SigSpec(parameters[child->str])));
rewrite_parameter:
para_info += stringf("%s=%s", child->str.c_str(), log_signal(RTLIL::SigSpec(parameters[para_id])));
delete child->children.at(0);
child->children[0] = AstNode::mkconst_bits(parameters[para_id].bits, (parameters[para_id].flags & RTLIL::CONST_FLAG_SIGNED) != 0);
parameters.erase(para_id);
continue;
}
para_id = stringf("$%d", para_counter);
if (parameters.count(para_id) > 0) {
log("Parameter %d (%s) = %s\n", para_counter, child->str.c_str(), log_signal(RTLIL::SigSpec(parameters[para_id])));
goto rewrite_parameter;
}
}
if (parameters.size() > 0)
log_error("Requested parameter `%s' does not exist in module `%s'!\n", parameters.begin()->first.c_str(), stripped_name.c_str());
std::string modname;
if (orig_parameters_n == 0)
modname = stripped_name;
else if (para_info.size() > 60)
modname = "$paramod$" + sha1(para_info) + stripped_name;
else
modname = "$paramod" + stripped_name + para_info;
if (!design->has(modname)) {
new_ast->str = modname;
design->add(process_module(new_ast, false));
design->module(modname)->check();
} else {
log("Found cached RTLIL representation for module `%s'.\n", modname.c_str());
}
delete new_ast;
return modname;
}
RTLIL::Module *AstModule::clone() const
{
AstModule *new_mod = new AstModule;
new_mod->name = name;
cloneInto(new_mod);
new_mod->ast = ast->clone();
new_mod->nolatches = nolatches;
new_mod->nomeminit = nomeminit;
new_mod->nomem2reg = nomem2reg;
new_mod->mem2reg = mem2reg;
new_mod->lib = lib;
new_mod->noopt = noopt;
new_mod->icells = icells;
new_mod->autowire = autowire;
return new_mod;
}
// internal dummy line number callbacks
namespace {
int internal_line_num;
void internal_set_line_num(int n) {
internal_line_num = n;
}
int internal_get_line_num() {
return internal_line_num;
}
}
// use internal dummy line number callbacks
void AST::use_internal_line_num()
{
set_line_num = &internal_set_line_num;
get_line_num = &internal_get_line_num;
}
YOSYS_NAMESPACE_END
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