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authorAnders Carlsson <andersca@mac.com>2008-12-12 07:19:02 +0000
committerAnders Carlsson <andersca@mac.com>2008-12-12 07:19:02 +0000
commitccbe9200f9f3ec2062a235f7377024db50cbb2f9 (patch)
tree934e637b2b7c8082f906b07017c977add727704b /clang/lib/CodeGen/CodeGenFunction.cpp
parentdcba4a7713035fc6bf3dc5703147e693a1ff3c14 (diff)
downloadbcm5719-llvm-ccbe9200f9f3ec2062a235f7377024db50cbb2f9.tar.gz
bcm5719-llvm-ccbe9200f9f3ec2062a235f7377024db50cbb2f9.zip
Add map of VLA types and their sizes
llvm-svn: 60939
Diffstat (limited to 'clang/lib/CodeGen/CodeGenFunction.cpp')
-rw-r--r--clang/lib/CodeGen/CodeGenFunction.cpp27
1 files changed, 27 insertions, 0 deletions
diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index fe88bc91272..bcb51a3efc6 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -401,3 +401,30 @@ llvm::Value *CodeGenFunction::EmitVAArg(llvm::Value *VAListAddr, QualType Ty)
return AddrTyped;
}
+llvm::Value *CodeGenFunction::GetVLASize(const VariableArrayType *VAT)
+{
+ llvm::Value *&SizeEntry = VLASizeMap[VAT];
+
+ if (!SizeEntry) {
+ // Get the element size;
+ llvm::Value *ElemSize;
+
+ QualType ElemTy = VAT->getElementType();
+
+ if (const VariableArrayType *ElemVAT =
+ getContext().getAsVariableArrayType(ElemTy))
+ ElemSize = GetVLASize(ElemVAT);
+ else {
+ // FIXME: We use Int32Ty here because the alloca instruction takes a
+ // 32-bit integer. What should we do about overflow?
+ ElemSize = llvm::ConstantInt::get(llvm::Type::Int32Ty,
+ getContext().getTypeSize(ElemTy) / 8);
+ }
+
+ llvm::Value *NumElements = EmitScalarExpr(VAT->getSizeExpr());
+
+ SizeEntry = Builder.CreateMul(ElemSize, NumElements);
+ }
+
+ return SizeEntry;
+}
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