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Warn when a negative value is assigned to a genvar (-g2001 only) (issue #567) 

(cherry picked from commit 668f9850bc)
This commit is contained in:
Martin Whitaker 2021-12-13 21:20:09 +00:00
parent cdbc2c466f
commit 48ab896fa6
2 changed files with 15 additions and 0 deletions
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1
PGenerate.h
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@ -115,6 +115,7 @@ class PGenerate : public PNamedItem, public LexicalScope {
SymbolType symbol_type() const;
private:
void check_for_valid_genvar_value_(long value);
bool generate_scope_loop_(Design*des, NetScope*container);
bool generate_scope_condit_(Design*des, NetScope*container, bool else_flag);
bool generate_scope_case_(Design*des, NetScope*container);

14
elab_scope.cc
View File

@ -895,6 +895,18 @@ bool PGenerate::generate_scope(Design*des, NetScope*container)
}
}
void PGenerate::check_for_valid_genvar_value_(long value)
{
if (generation_flag < GN_VER2005 && value < 0) {
cerr << get_fileline() << ": warning: A negative value (" << value
<< ") has been assigned to genvar '" << loop_index << "'."
<< endl;
cerr << get_fileline() << ": : This is illegal in "
"Verilog-2001. Use at least -g2005 to remove this warning."
<< endl;
}
}
/*
* This is the elaborate scope method for a generate loop.
*/
@ -939,6 +951,7 @@ bool PGenerate::generate_scope_loop_(Design*des, NetScope*container)
}
genvar = init->value().as_long();
check_for_valid_genvar_value_(genvar);
delete init_ex;
if (debug_scopes)
@ -1009,6 +1022,7 @@ bool PGenerate::generate_scope_loop_(Design*des, NetScope*container)
<< genvar << " to " << step->value().as_long() << endl;
genvar = step->value().as_long();
check_for_valid_genvar_value_(genvar);
container->genvar_tmp_val = genvar;
delete step;
delete test_ex;