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Added warning for use of 'z' constants in HDL

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This commit is contained in:
Clifford Wolf 2014-11-14 19:59:50 +01:00
parent 4e5350b409
commit 87333f3ae2
3 changed files with 14 additions and 6 deletions
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10
frontends/verilog/const2ast.cc
View file

@ -132,8 +132,16 @@ static void my_strtobin(std::vector<RTLIL::State> &data, const char *str, int le
}
// convert the verilog code for a constant to an AST node
AstNode *VERILOG_FRONTEND::const2ast(std::string code, char case_type)
AstNode *VERILOG_FRONTEND::const2ast(std::string code, char case_type, bool warn_z)
{
if (warn_z) {
AstNode *ret = const2ast(code, case_type);
if (std::find(ret->bits.begin(), ret->bits.end(), RTLIL::State::Sz) != ret->bits.end())
log_warning("Yosys does not support tri-state logic at the moment. (%s:%d)\n",
current_filename.c_str(), frontend_verilog_yyget_lineno());
return ret;
}
const char *str = code.c_str();
// Strings

2
frontends/verilog/verilog_frontend.h
View file

@ -43,7 +43,7 @@ namespace VERILOG_FRONTEND
extern struct AST::AstNode *current_ast;
// this function converts a Verilog constant to an AST_CONSTANT node
AST::AstNode *const2ast(std::string code, char case_type = 0);
AST::AstNode *const2ast(std::string code, char case_type = 0, bool warn_z = false);
// state of `default_nettype
extern bool default_nettype_wire;

8
frontends/verilog/verilog_parser.y
View file

@ -1251,7 +1251,7 @@ basic_expr:
if ($4->substr(0, 1) != "'")
frontend_verilog_yyerror("Syntax error.");
AstNode *bits = $2;
AstNode *val = const2ast(*$4, case_type_stack.size() == 0 ? 0 : case_type_stack.back());
AstNode *val = const2ast(*$4, case_type_stack.size() == 0 ? 0 : case_type_stack.back(), true);
if (val == NULL)
log_error("Value conversion failed: `%s'\n", $4->c_str());
$$ = new AstNode(AST_TO_BITS, bits, val);
@ -1262,7 +1262,7 @@ basic_expr:
frontend_verilog_yyerror("Syntax error.");
AstNode *bits = new AstNode(AST_IDENTIFIER);
bits->str = *$1;
AstNode *val = const2ast(*$2, case_type_stack.size() == 0 ? 0 : case_type_stack.back());
AstNode *val = const2ast(*$2, case_type_stack.size() == 0 ? 0 : case_type_stack.back(), true);
if (val == NULL)
log_error("Value conversion failed: `%s'\n", $2->c_str());
$$ = new AstNode(AST_TO_BITS, bits, val);
@ -1270,14 +1270,14 @@ basic_expr:
delete $2;
} |
TOK_CONST TOK_CONST {
$$ = const2ast(*$1 + *$2, case_type_stack.size() == 0 ? 0 : case_type_stack.back());
$$ = const2ast(*$1 + *$2, case_type_stack.size() == 0 ? 0 : case_type_stack.back(), true);
if ($$ == NULL || (*$2)[0] != '\'')
log_error("Value conversion failed: `%s%s'\n", $1->c_str(), $2->c_str());
delete $1;
delete $2;
} |
TOK_CONST {
$$ = const2ast(*$1, case_type_stack.size() == 0 ? 0 : case_type_stack.back());
$$ = const2ast(*$1, case_type_stack.size() == 0 ? 0 : case_type_stack.back(), true);
if ($$ == NULL)
log_error("Value conversion failed: `%s'\n", $1->c_str());
delete $1;