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Initial implementation of elaboration system tasks

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(IEEE1800-2017 section 20.11)
This PR allows us to use $info/$warning/$error/$fatal **at elaboration time** within a generate block.
This is very useful to stop a synthesis of a parametrized block when an
illegal combination of parameters is chosen.
This commit is contained in:
Udi Finkelstein 2019-05-03 03:10:43 +03:00
parent 98925f6c4b
commit ac10e7d96d
10 changed files with 107 additions and 5 deletions
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5
frontends/verilog/verilog_lexer.l
View file

@ -301,6 +301,11 @@ supply1 { return TOK_SUPPLY1; }
return TOK_ID;
}
"$"(info|warning|error|fatal) {
frontend_verilog_yylval.string = new std::string(yytext);
return TOK_ELAB_TASK;
}
"$signed" { return TOK_TO_SIGNED; }
"$unsigned" { return TOK_TO_UNSIGNED; }

11
frontends/verilog/verilog_parser.y
View file

@ -105,7 +105,7 @@ static void free_attr(std::map<std::string, AstNode*> *al)
bool boolean;
}
%token <string> TOK_STRING TOK_ID TOK_CONSTVAL TOK_REALVAL TOK_PRIMITIVE TOK_SVA_LABEL
%token <string> TOK_STRING TOK_ID TOK_CONSTVAL TOK_REALVAL TOK_PRIMITIVE TOK_SVA_LABEL TOK_ELAB_TASK
%token TOK_ASSERT TOK_ASSUME TOK_RESTRICT TOK_COVER
%token ATTR_BEGIN ATTR_END DEFATTR_BEGIN DEFATTR_END
%token TOK_MODULE TOK_ENDMODULE TOK_PARAMETER TOK_LOCALPARAM TOK_DEFPARAM
@ -1869,6 +1869,15 @@ gen_stmt:
if ($6 != NULL)
delete $6;
ast_stack.pop_back();
} |
TOK_ELAB_TASK {
AstNode *node = new AstNode(AST_TECALL);
node->str = *$1;
delete $1;
ast_stack.back()->children.push_back(node);
ast_stack.push_back(node);
} opt_arg_list ';'{
ast_stack.pop_back();
};
gen_stmt_block: