From: Anders Carlsson <andersca@mac.com>
Date: Mon, 9 Feb 2009 20:20:56 +0000 (+0000)
Subject: Add DidCallStackSave variable to CodeGenFunction.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4cc1a4703363ff940b6273aeef9d96a87edeb04b;p=clang

Add DidCallStackSave variable to CodeGenFunction.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64156 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/CodeGenFunction.cpp b/lib/CodeGen/CodeGenFunction.cpp
index 5e005b4c55..153fcc8ec4 100644
--- a/lib/CodeGen/CodeGenFunction.cpp
+++ b/lib/CodeGen/CodeGenFunction.cpp
@@ -144,6 +144,7 @@ void CodeGenFunction::StartFunction(const Decl *D, QualType RetTy,
                                     llvm::Function *Fn,
                                     const FunctionArgList &Args,
                                     SourceLocation StartLoc) {
+  DidCallStackSave = false;
   CurFuncDecl = D;
   FnRetTy = RetTy;
   CurFn = Fn;
diff --git a/lib/CodeGen/CodeGenFunction.h b/lib/CodeGen/CodeGenFunction.h
index 58d3a73433..03230949e5 100644
--- a/lib/CodeGen/CodeGenFunction.h
+++ b/lib/CodeGen/CodeGenFunction.h
@@ -260,6 +260,10 @@ private:
   /// which the stack depth changes.
   llvm::Value *StackDepth;
 
+  /// DidCallStackSave - Whether llvm.stacksave has been called. Used to avoid
+  /// calling llvm.stacksave for multiple VLAs in the same scope.
+  bool DidCallStackSave;
+  
   /// StackSaveValues - A stack(!) of stack save values. When a new scope is
   /// entered, a null is pushed on this stack. If a VLA is emitted, then the
   /// return value of llvm.stacksave() is stored at the top of this stack.