From 8e5ea9c33cb7cd93015f7e608a778b6bdfd63091 Mon Sep 17 00:00:00 2001
From: Matt Pharr <matt.pharr@intel.com>
Date: Wed, 6 Jul 2011 15:33:26 +0100
Subject: [PATCH] Set up NULL values for default arguments when creating ispc
 functions from LLVM bitcode builtins.

Fixes occasional crashes due to accessing uninitialized memory.
---
 builtins.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/builtins.cpp b/builtins.cpp
index bdc132ca..ef8eea0d 100644
--- a/builtins.cpp
+++ b/builtins.cpp
@@ -178,6 +178,12 @@ lCreateISPCSymbol(llvm::Function *func, SymbolTable *symbolTable) {
         // so that we get symbols for things with no integer types!
         if (i == 0 || anyIntArgs == true) {
             FunctionType *funcType = new FunctionType(returnType, argTypes, noPos);
+            // set NULL default arguments
+            std::vector<ConstExpr *> defaults;
+            for (int j = 0; j < ftype->getNumParams(); ++j)
+                defaults.push_back(NULL);
+            funcType->SetArgumentDefaults(defaults);
+
             Symbol *sym = new Symbol(name, noPos, funcType);
             sym->function = func;
             symbolTable->AddFunction(sym);