Changes in directory llvm/lib/VMCore:
Constants.cpp updated: 1.145 -> 1.146
---
Log message:
Get rid of the multiple copies of getStringValue. Now a Constant:: method.
---
Diffs of the changes: (+40 -0)
Constants.cpp | 40 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 40 insertions(+)
Index: llvm/lib/VMCore/Constants.cpp
diff -u llvm/lib/VMCore/Constants.cpp:1.145 llvm/lib/VMCore/Constants.cpp:1.146
--- llvm/lib/VMCore/Constants.cpp:1.145 Tue Jan 17 14:07:22 2006
+++ llvm/lib/VMCore/Constants.cpp Wed Mar 8 12:11:07 2006
@@ -1712,3 +1712,43 @@
(*I)->destroyConstantImpl();
Constants.clear();
}
+
+/// getStringValue - Turn an LLVM constant pointer that eventually points to a
+/// global into a string value. Return an empty string if we can't do it.
+///
+std::string Constant::getStringValue(unsigned Offset) {
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(this)) {
+ if (GV->hasInitializer() && isa<ConstantArray>(GV->getInitializer())) {
+ ConstantArray *Init = cast<ConstantArray>(GV->getInitializer());
+ if (Init->isString()) {
+ std::string Result = Init->getAsString();
+ if (Offset < Result.size()) {
+ // If we are pointing INTO The string, erase the beginning...
+ Result.erase(Result.begin(), Result.begin()+Offset);
+
+ // Take off the null terminator, and any string fragments after it.
+ std::string::size_type NullPos = Result.find_first_of((char)0);
+ if (NullPos != std::string::npos)
+ Result.erase(Result.begin()+NullPos, Result.end());
+ return Result;
+ }
+ }
+ }
+ } else if (Constant *C = dyn_cast<Constant>(this)) {
+ if (GlobalValue *GV = dyn_cast<GlobalValue>(C))
+ return GV->getStringValue(Offset);
+ else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
+ if (CE->getOpcode() == Instruction::GetElementPtr) {
+ // Turn a gep into the specified offset.
+ if (CE->getNumOperands() == 3 &&
+ cast<Constant>(CE->getOperand(1))->isNullValue() &&
+ isa<ConstantInt>(CE->getOperand(2))) {
+ Offset += cast<ConstantInt>(CE->getOperand(2))->getRawValue();
+ return CE->getOperand(0)->getStringValue(Offset);
+ }
+ }
+ }
+ }
+ return "";
+}
+
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