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author | Anton Korobeynikov <asl@math.spbu.ru> | 2008-06-29 17:57:03 +0000 |
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committer | Anton Korobeynikov <asl@math.spbu.ru> | 2008-06-29 17:57:03 +0000 |
commit | 6d116bc7ced56a820d33b0dd35ee36af8a810eab (patch) | |
tree | b9d056c655001ef42c66a3395d01233d2a499537 /lib/VMCore/Constants.cpp | |
parent | 28a2b54580b28be10c536def7f49b5599adf3631 (diff) | |
download | external_llvm-6d116bc7ced56a820d33b0dd35ee36af8a810eab.zip external_llvm-6d116bc7ced56a820d33b0dd35ee36af8a810eab.tar.gz external_llvm-6d116bc7ced56a820d33b0dd35ee36af8a810eab.tar.bz2 |
Revert (52748 and friends):
Move GetConstantStringInfo to lib/Analysis. Remove
string output routine from Constant. Update all
callers. Change debug intrinsic api slightly to
accomodate move of routine, these now return values
instead of strings.
This unbreaks llvm-gcc bootstrap.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52884 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/VMCore/Constants.cpp')
-rw-r--r-- | lib/VMCore/Constants.cpp | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp index 7a08b5f..b9976a7 100644 --- a/lib/VMCore/Constants.cpp +++ b/lib/VMCore/Constants.cpp @@ -2658,4 +2658,44 @@ void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV, // Delete the old constant! destroyConstant(); -}
\ No newline at end of file +} + + +/// 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. +/// Parameter Chop determines if the result is chopped at the first null +/// terminator. +/// +std::string Constant::getStringValue(bool Chop, 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. + if (Chop) { + 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 (ConstantExpr *CE = dyn_cast<ConstantExpr>(this)) { + 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))->getZExtValue(); + return CE->getOperand(0)->getStringValue(Chop, Offset); + } + } + } + return ""; +} |