From: Ian Lance Taylor <ian@gcc.gnu.org>
Date: Wed, 28 Mar 2012 22:31:02 +0000 (+0000)
Subject: compiler: fix null-dereference on invalid len() arg.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2e540b505941a63f422d865c2a1490193e459d38;p=gcc.git

compiler: fix null-dereference on invalid len() arg.

This patch fixes an ICE caused by syntax errors in arguments
to unary built-in functions like len().

Updates issue 7.

From Rémy Oudompheng.

From-SVN: r185935
---

diff --git a/gcc/go/gofrontend/expressions.cc b/gcc/go/gofrontend/expressions.cc
index f1e06397cfa..13c7de37835 100644
--- a/gcc/go/gofrontend/expressions.cc
+++ b/gcc/go/gofrontend/expressions.cc
@@ -6609,7 +6609,7 @@ Builtin_call_expression::do_lower(Gogo* gogo, Named_object* function,
       if (this->code_ == BUILTIN_LEN || this->code_ == BUILTIN_CAP)
 	{
 	  Expression* arg = this->one_arg();
-	  if (!arg->is_constant())
+	  if (arg != NULL && !arg->is_constant())
 	    {
 	      Find_call_expression find_call;
 	      Expression::traverse(&arg, &find_call);
@@ -6929,7 +6929,7 @@ Expression*
 Builtin_call_expression::one_arg() const
 {
   const Expression_list* args = this->args();
-  if (args->size() != 1)
+  if (args == NULL || args->size() != 1)
     return NULL;
   return args->front();
 }