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Added deep recursion warning to AST simplify

This commit is contained in:
Clifford Wolf 2015-02-20 10:33:20 +01:00
parent dc1a0f06fc
commit d5ce9a32ef
1 changed files with 7 additions and 1 deletions
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8
frontends/ast/simplify.cc
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@ -51,7 +51,12 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
{
static int recursion_counter = 0;
static pair<string, int> last_blocking_assignment_warn;
recursion_counter++;
static bool deep_recursion_warning = false;
if (recursion_counter++ == 1000 && deep_recursion_warning) {
log_warning("Deep recursion in AST simplifier.\nDoes this design contain insanely long expressions?\n");
deep_recursion_warning = false;
}
AstNode *newNode = NULL;
bool did_something = false;
@ -69,6 +74,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
log_assert(type == AST_MODULE);
last_blocking_assignment_warn = pair<string, int>();
deep_recursion_warning = true;
while (simplify(const_fold, at_zero, in_lvalue, 1, width_hint, sign_hint, in_param)) { }
if (!flag_nomem2reg && !get_bool_attribute("\\nomem2reg"))