From: Chris Lattner <sabre@nondot.org>
Date: Tue, 13 Oct 2009 06:04:29 +0000 (+0000)
Subject: number address-taken labels from 1.  This allows 0 to be used as a sentinel
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=9329a5c2924bc2c6379d7c202a4b312321edd719;p=clang

number address-taken labels from 1.  This allows 0 to be used as a sentinel
for a null pointer.  In other words, "&&foo != NULL" will always work out to
true.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@83948 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/CodeGenFunction.cpp b/lib/CodeGen/CodeGenFunction.cpp
index 10c10d9a8a..2d4dc455f2 100644
--- a/lib/CodeGen/CodeGenFunction.cpp
+++ b/lib/CodeGen/CodeGenFunction.cpp
@@ -444,7 +444,7 @@ void CodeGenFunction::ErrorUnsupported(const Stmt *S, const char *Type,
 
 unsigned CodeGenFunction::GetIDForAddrOfLabel(const LabelStmt *L) {
   // Use LabelIDs.size() as the new ID if one hasn't been assigned.
-  return LabelIDs.insert(std::make_pair(L, LabelIDs.size())).first->second;
+  return LabelIDs.insert(std::make_pair(L, LabelIDs.size()+1)).first->second;
 }
 
 void CodeGenFunction::EmitMemSetToZero(llvm::Value *DestPtr, QualType Ty) {