mirror of
https://github.com/RPCSX/llvm.git
synced 2024-12-13 06:38:44 +00:00
0ee5788656
Create a common accessor, DbgInfoIntrinsic::getVariableLocation, which doesn't care about the type of debug info intrinsic. Use this to further unify the implementations of DbgDeclareInst::getAddress and DbgValueInst::getValue. Besides being a cleanup, I'm planning to use this to prepare DEBUG output without having to branch on the concrete type. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264767 91177308-0d34-0410-b5e6-96231b3b80d8
104 lines
3.8 KiB
C++
104 lines
3.8 KiB
C++
//===-- InstrinsicInst.cpp - Intrinsic Instruction Wrappers ---------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements methods that make it really easy to deal with intrinsic
|
|
// functions.
|
|
//
|
|
// All intrinsic function calls are instances of the call instruction, so these
|
|
// are all subclasses of the CallInst class. Note that none of these classes
|
|
// has state or virtual methods, which is an important part of this gross/neat
|
|
// hack working.
|
|
//
|
|
// In some cases, arguments to intrinsics need to be generic and are defined as
|
|
// type pointer to empty struct { }*. To access the real item of interest the
|
|
// cast instruction needs to be stripped away.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/IR/IntrinsicInst.h"
|
|
#include "llvm/IR/Constants.h"
|
|
#include "llvm/IR/GlobalVariable.h"
|
|
#include "llvm/IR/Metadata.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
using namespace llvm;
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// DbgInfoIntrinsic - This is the common base class for debug info intrinsics
|
|
///
|
|
|
|
static Value *CastOperand(Value *C) {
|
|
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
|
|
if (CE->isCast())
|
|
return CE->getOperand(0);
|
|
return nullptr;
|
|
}
|
|
|
|
Value *DbgInfoIntrinsic::StripCast(Value *C) {
|
|
if (Value *CO = CastOperand(C)) {
|
|
C = StripCast(CO);
|
|
} else if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
|
|
if (GV->hasInitializer())
|
|
if (Value *CO = CastOperand(GV->getInitializer()))
|
|
C = StripCast(CO);
|
|
}
|
|
return dyn_cast<GlobalVariable>(C);
|
|
}
|
|
|
|
Value *DbgInfoIntrinsic::getVariableLocation(bool AllowNullOp) const {
|
|
Value *Op = getArgOperand(0);
|
|
if (AllowNullOp && !Op)
|
|
return nullptr;
|
|
|
|
auto *MD = cast<MetadataAsValue>(Op)->getMetadata();
|
|
if (auto *V = dyn_cast<ValueAsMetadata>(MD))
|
|
return V->getValue();
|
|
|
|
// When the value goes to null, it gets replaced by an empty MDNode.
|
|
assert(!cast<MDNode>(MD)->getNumOperands() && "Expected an empty MDNode");
|
|
return nullptr;
|
|
}
|
|
|
|
int llvm::Intrinsic::lookupLLVMIntrinsicByName(ArrayRef<const char *> NameTable,
|
|
StringRef Name) {
|
|
assert(Name.startswith("llvm."));
|
|
|
|
// Do successive binary searches of the dotted name components. For
|
|
// "llvm.gc.experimental.statepoint.p1i8.p1i32", we will find the range of
|
|
// intrinsics starting with "llvm.gc", then "llvm.gc.experimental", then
|
|
// "llvm.gc.experimental.statepoint", and then we will stop as the range is
|
|
// size 1. During the search, we can skip the prefix that we already know is
|
|
// identical. By using strncmp we consider names with differing suffixes to
|
|
// be part of the equal range.
|
|
size_t CmpStart = 0;
|
|
size_t CmpEnd = 4; // Skip the "llvm" component.
|
|
const char *const *Low = NameTable.begin();
|
|
const char *const *High = NameTable.end();
|
|
const char *const *LastLow = Low;
|
|
while (CmpEnd < Name.size() && High - Low > 0) {
|
|
CmpStart = CmpEnd;
|
|
CmpEnd = Name.find('.', CmpStart + 1);
|
|
CmpEnd = CmpEnd == StringRef::npos ? Name.size() : CmpEnd;
|
|
auto Cmp = [CmpStart, CmpEnd](const char *LHS, const char *RHS) {
|
|
return strncmp(LHS + CmpStart, RHS + CmpStart, CmpEnd - CmpStart) < 0;
|
|
};
|
|
LastLow = Low;
|
|
std::tie(Low, High) = std::equal_range(Low, High, Name.data(), Cmp);
|
|
}
|
|
if (High - Low > 0)
|
|
LastLow = Low;
|
|
|
|
if (LastLow == NameTable.end())
|
|
return -1;
|
|
StringRef NameFound = *LastLow;
|
|
if (Name == NameFound ||
|
|
(Name.startswith(NameFound) && Name[NameFound.size()] == '.'))
|
|
return LastLow - NameTable.begin();
|
|
return -1;
|
|
}
|