diff options
| author | Dan Gohman <gohman@apple.com> | 2009-07-27 21:59:50 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-07-27 21:59:50 +0000 |
| commit | 75b7f678a3a055cef372daeb928eb466ca350f1e (patch) | |
| tree | ffde2b342ec6dea02e4f9cfc3e2b37cdec4b45f7 /llvm/lib/VMCore/LLVMContext.cpp | |
| parent | 0ad4247da3b93b0a472df9a3bfda4b9cd365d9dc (diff) | |
| download | bcm5719-llvm-75b7f678a3a055cef372daeb928eb466ca350f1e.tar.gz bcm5719-llvm-75b7f678a3a055cef372daeb928eb466ca350f1e.zip | |
Add a comment about the "getelementptr null" trick.
llvm-svn: 77262
Diffstat (limited to 'llvm/lib/VMCore/LLVMContext.cpp')
| -rw-r--r-- | llvm/lib/VMCore/LLVMContext.cpp | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/llvm/lib/VMCore/LLVMContext.cpp b/llvm/lib/VMCore/LLVMContext.cpp index d7f4594e3ab..722e29ee5dc 100644 --- a/llvm/lib/VMCore/LLVMContext.cpp +++ b/llvm/lib/VMCore/LLVMContext.cpp @@ -419,6 +419,7 @@ Constant* LLVMContext::getConstantExprInsertValue(Constant* Agg, Constant* Val, Constant* LLVMContext::getConstantExprSizeOf(const Type* Ty) { // sizeof is implemented as: (i64) gep (Ty*)null, 1 + // Note that a non-inbounds gep is used, as null isn't within any object. Constant *GEPIdx = ConstantInt::get(Type::Int32Ty, 1); Constant *GEP = getConstantExprGetElementPtr( getNullValue(getPointerTypeUnqual(Ty)), &GEPIdx, 1); |
