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-rw-r--r--lib/IR/Globals.cpp25
1 files changed, 25 insertions, 0 deletions
diff --git a/lib/IR/Globals.cpp b/lib/IR/Globals.cpp
index 0ec54fe3c0..d64046a7bf 100644
--- a/lib/IR/Globals.cpp
+++ b/lib/IR/Globals.cpp
@@ -15,6 +15,7 @@
#include "llvm/IR/GlobalValue.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/IR/Constants.h"
+#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/GlobalAlias.h"
#include "llvm/IR/GlobalVariable.h"
@@ -282,3 +283,27 @@ GlobalObject *GlobalAlias::getAliasedGlobal() {
return cast<GlobalObject>(GV);
}
}
+
+uint64_t GlobalAlias::calculateOffset(const DataLayout &DL) const {
+ uint64_t Offset = 0;
+ const Constant *C = this;
+ while (C) {
+ if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(C)) {
+ C = GA->getAliasee();
+ } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
+ if (CE->getOpcode() == Instruction::GetElementPtr) {
+ std::vector<Value*> Args;
+ for (unsigned I = 1; I < CE->getNumOperands(); ++I)
+ Args.push_back(CE->getOperand(I));
+ Offset += DL.getIndexedOffset(CE->getOperand(0)->getType(), Args);
+ }
+ C = CE->getOperand(0);
+ } else if (isa<GlobalValue>(C)) {
+ return Offset;
+ } else {
+ assert(0 && "Unexpected type in alias chain!");
+ return 0;
+ }
+ }
+ return Offset;
+}