From d5ce9a32ef51cd56810b3a1842dff846c1c8eab6 Mon Sep 17 00:00:00 2001 From: Clifford Wolf Date: Fri, 20 Feb 2015 10:33:20 +0100 Subject: Added deep recursion warning to AST simplify --- frontends/ast/simplify.cc | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'frontends') diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc index ed767514..404dab4e 100644 --- a/frontends/ast/simplify.cc +++ b/frontends/ast/simplify.cc @@ -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 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(); + 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")) -- cgit v1.2.3