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Added non-std verilog assume() statement

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This commit is contained in:
Clifford Wolf 2015-02-26 18:47:39 +01:00
parent b005eedf36
commit 1f1deda888
10 changed files with 67 additions and 25 deletions
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1
frontends/ast/ast.cc
View file

@ -90,6 +90,7 @@ std::string AST::type2str(AstNodeType type)
X(AST_IDENTIFIER)
X(AST_PREFIX)
X(AST_ASSERT)
X(AST_ASSUME)
X(AST_FCALL)
X(AST_TO_BITS)
X(AST_TO_SIGNED)

1
frontends/ast/ast.h
View file

@ -64,6 +64,7 @@ namespace AST
AST_IDENTIFIER,
AST_PREFIX,
AST_ASSERT,
AST_ASSUME,
AST_FCALL,
AST_TO_BITS,

11
frontends/ast/genrtlil.cc
View file

@ -1265,19 +1265,22 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
// generate $assert cells
case AST_ASSERT:
case AST_ASSUME:
{
log_assert(children.size() == 2);
RTLIL::SigSpec check = children[0]->genRTLIL();
log_assert(check.size() == 1);
if (GetSize(check) != 1)
check = current_module->ReduceBool(NEW_ID, check);
RTLIL::SigSpec en = children[1]->genRTLIL();
log_assert(en.size() == 1);
if (GetSize(en) != 1)
en = current_module->ReduceBool(NEW_ID, en);
std::stringstream sstr;
sstr << "$assert$" << filename << ":" << linenum << "$" << (autoidx++);
sstr << (type == AST_ASSERT ? "$assert$" : "$assume$") << filename << ":" << linenum << "$" << (autoidx++);
RTLIL::Cell *cell = current_module->addCell(sstr.str(), "$assert");
RTLIL::Cell *cell = current_module->addCell(sstr.str(), type == AST_ASSERT ? "$assert" : "$assume");
cell->attributes["\\src"] = stringf("%s:%d", filename.c_str(), linenum);
for (auto &attr : attributes) {

7
frontends/ast/simplify.cc
View file

@ -1211,7 +1211,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
}
skip_dynamic_range_lvalue_expansion:;
if (stage > 1 && type == AST_ASSERT && current_block != NULL)
if (stage > 1 && (type == AST_ASSERT || type == AST_ASSUME) && current_block != NULL)
{
std::stringstream sstr;
sstr << "$assert$" << filename << ":" << linenum << "$" << (autoidx++);
@ -1255,7 +1255,7 @@ skip_dynamic_range_lvalue_expansion:;
newNode->children.push_back(assign_check);
newNode->children.push_back(assign_en);
AstNode *assertnode = new AstNode(AST_ASSERT);
AstNode *assertnode = new AstNode(type);
assertnode->children.push_back(new AstNode(AST_IDENTIFIER));
assertnode->children.push_back(new AstNode(AST_IDENTIFIER));
assertnode->children[0]->str = id_check;
@ -1266,9 +1266,8 @@ skip_dynamic_range_lvalue_expansion:;
goto apply_newNode;
}
if (stage > 1 && type == AST_ASSERT && children.size() == 1)
if (stage > 1 && (type == AST_ASSERT || type == AST_ASSUME) && children.size() == 1)
{
children[0] = new AstNode(AST_REDUCE_BOOL, children[0]->clone());
children.push_back(mkconst_int(1, false, 1));
did_something = true;
}

12
frontends/verilog/verilog_frontend.cc
View file

@ -54,6 +54,10 @@ struct VerilogFrontend : public Frontend {
log(" enable support for SystemVerilog features. (only a small subset\n");
log(" of SystemVerilog is supported)\n");
log("\n");
log(" -formal\n");
log(" enable support for assert() and assume() statements\n");
log(" (assert support is also enabled with -sv)\n");
log("\n");
log(" -dump_ast1\n");
log(" dump abstract syntax tree (before simplification)\n");
log("\n");
@ -164,6 +168,7 @@ struct VerilogFrontend : public Frontend {
frontend_verilog_yydebug = false;
sv_mode = false;
formal_mode = false;
log_header("Executing Verilog-2005 frontend.\n");
@ -176,6 +181,10 @@ struct VerilogFrontend : public Frontend {
sv_mode = true;
continue;
}
if (arg == "-formal") {
formal_mode = true;
continue;
}
if (arg == "-dump_ast1") {
flag_dump_ast1 = true;
continue;
@ -271,7 +280,8 @@ struct VerilogFrontend : public Frontend {
}
extra_args(f, filename, args, argidx);
log("Parsing %s input from `%s' to AST representation.\n", sv_mode ? "SystemVerilog" : "Verilog", filename.c_str());
log("Parsing %s%s input from `%s' to AST representation.\n",
formal_mode ? "formal " : "", sv_mode ? "SystemVerilog" : "Verilog", filename.c_str());
AST::current_filename = filename;
AST::set_line_num = &frontend_verilog_yyset_lineno;

3
frontends/verilog/verilog_frontend.h
View file

@ -51,6 +51,9 @@ namespace VERILOG_FRONTEND
// running in SystemVerilog mode
extern bool sv_mode;
// running in -formal mode
extern bool formal_mode;
// lexer input stream
extern std::istream *lexin;
}

5
frontends/verilog/verilog_lexer.l
View file

@ -166,8 +166,9 @@ YOSYS_NAMESPACE_END
"always_ff" { SV_KEYWORD(TOK_ALWAYS); }
"always_latch" { SV_KEYWORD(TOK_ALWAYS); }
"assert" { SV_KEYWORD(TOK_ASSERT); }
"property" { SV_KEYWORD(TOK_PROPERTY); }
"assert" { if (formal_mode) return TOK_ASSERT; SV_KEYWORD(TOK_ASSERT); }
"assume" { if (formal_mode) return TOK_ASSUME; return TOK_ID; }
"property" { if (formal_mode) return TOK_PROPERTY; SV_KEYWORD(TOK_PROPERTY); }
"logic" { SV_KEYWORD(TOK_REG); }
"bit" { SV_KEYWORD(TOK_REG); }

10
frontends/verilog/verilog_parser.y
View file

@ -57,7 +57,7 @@ namespace VERILOG_FRONTEND {
std::vector<char> case_type_stack;
bool do_not_require_port_stubs;
bool default_nettype_wire;
bool sv_mode;
bool sv_mode, formal_mode;
std::istream *lexin;
}
YOSYS_NAMESPACE_END
@ -111,7 +111,7 @@ static void free_attr(std::map<std::string, AstNode*> *al)
%token TOK_GENERATE TOK_ENDGENERATE TOK_GENVAR TOK_REAL
%token TOK_SYNOPSYS_FULL_CASE TOK_SYNOPSYS_PARALLEL_CASE
%token TOK_SUPPLY0 TOK_SUPPLY1 TOK_TO_SIGNED TOK_TO_UNSIGNED
%token TOK_POS_INDEXED TOK_NEG_INDEXED TOK_ASSERT TOK_PROPERTY
%token TOK_POS_INDEXED TOK_NEG_INDEXED TOK_ASSERT TOK_ASSUME TOK_PROPERTY
%type <ast> range range_or_multirange non_opt_range non_opt_multirange range_or_signed_int
%type <ast> wire_type expr basic_expr concat_list rvalue lvalue lvalue_concat_list
@ -934,11 +934,17 @@ opt_label:
assert:
TOK_ASSERT '(' expr ')' ';' {
ast_stack.back()->children.push_back(new AstNode(AST_ASSERT, $3));
} |
TOK_ASSUME '(' expr ')' ';' {
ast_stack.back()->children.push_back(new AstNode(AST_ASSUME, $3));
};
assert_property:
TOK_ASSERT TOK_PROPERTY '(' expr ')' ';' {
ast_stack.back()->children.push_back(new AstNode(AST_ASSERT, $4));
} |
TOK_ASSUME TOK_PROPERTY '(' expr ')' ';' {
ast_stack.back()->children.push_back(new AstNode(AST_ASSUME, $4));
};
simple_behavioral_stmt: