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//===-- Instrumentation.cpp - TransformUtils Infrastructure ---------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the common initialization infrastructure for the
// Instrumentation library.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Instrumentation.h"
#include "llvm-c/Initialization.h"
#include "llvm/ADT/Triple.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Module.h"
#include "llvm/InitializePasses.h"
#include "llvm/PassRegistry.h"
using namespace llvm;
/// Moves I before IP. Returns new insert point.
static BasicBlock::iterator moveBeforeInsertPoint(BasicBlock::iterator I, BasicBlock::iterator IP) {
// If I is IP, move the insert point down.
if (I == IP) {
++IP;
} else {
// Otherwise, move I before IP and return IP.
I->moveBefore(&*IP);
}
return IP;
}
/// Instrumentation passes often insert conditional checks into entry blocks.
/// Call this function before splitting the entry block to move instructions
/// that must remain in the entry block up before the split point. Static
/// allocas and llvm.localescape calls, for example, must remain in the entry
/// block.
BasicBlock::iterator llvm::PrepareToSplitEntryBlock(BasicBlock &BB,
BasicBlock::iterator IP) {
assert(&BB.getParent()->getEntryBlock() == &BB);
for (auto I = IP, E = BB.end(); I != E; ++I) {
bool KeepInEntry = false;
if (auto *AI = dyn_cast<AllocaInst>(I)) {
if (AI->isStaticAlloca())
KeepInEntry = true;
} else if (auto *II = dyn_cast<IntrinsicInst>(I)) {
if (II->getIntrinsicID() == llvm::Intrinsic::localescape)
KeepInEntry = true;
}
if (KeepInEntry)
IP = moveBeforeInsertPoint(I, IP);
}
return IP;
}
// Create a constant for Str so that we can pass it to the run-time lib.
GlobalVariable *llvm::createPrivateGlobalForString(Module &M, StringRef Str,
bool AllowMerging,
const char *NamePrefix) {
Constant *StrConst = ConstantDataArray::getString(M.getContext(), Str);
// We use private linkage for module-local strings. If they can be merged
// with another one, we set the unnamed_addr attribute.
GlobalVariable *GV =
new GlobalVariable(M, StrConst->getType(), true,
GlobalValue::PrivateLinkage, StrConst, NamePrefix);
if (AllowMerging)
GV->setUnnamedAddr(GlobalValue::UnnamedAddr::Global);
GV->setAlignment(Align(1)); // Strings may not be merged w/o setting
// alignment explicitly.
return GV;
}
Comdat *llvm::GetOrCreateFunctionComdat(Function &F, Triple &T,
const std::string &ModuleId) {
if (auto Comdat = F.getComdat()) return Comdat;
assert(F.hasName());
Module *M = F.getParent();
std::string Name = std::string(F.getName());
// Make a unique comdat name for internal linkage things on ELF. On COFF, the
// name of the comdat group identifies the leader symbol of the comdat group.
// The linkage of the leader symbol is considered during comdat resolution,
// and internal symbols with the same name from different objects will not be
// merged.
if (T.isOSBinFormatELF() && F.hasLocalLinkage()) {
if (ModuleId.empty())
return nullptr;
Name += ModuleId;
}
// Make a new comdat for the function. Use the "no duplicates" selection kind
// for non-weak symbols if the object file format supports it.
Comdat *C = M->getOrInsertComdat(Name);
if (T.isOSBinFormatCOFF() && !F.isWeakForLinker())
C->setSelectionKind(Comdat::NoDuplicates);
F.setComdat(C);
return C;
}
/// initializeInstrumentation - Initialize all passes in the TransformUtils
/// library.
void llvm::initializeInstrumentation(PassRegistry &Registry) {
initializeAddressSanitizerLegacyPassPass(Registry);
initializeModuleAddressSanitizerLegacyPassPass(Registry);
initializeMemProfilerLegacyPassPass(Registry);
initializeModuleMemProfilerLegacyPassPass(Registry);
initializeBoundsCheckingLegacyPassPass(Registry);
initializeControlHeightReductionLegacyPassPass(Registry);
initializeGCOVProfilerLegacyPassPass(Registry);
initializePGOInstrumentationGenLegacyPassPass(Registry);
initializePGOInstrumentationUseLegacyPassPass(Registry);
initializePGOIndirectCallPromotionLegacyPassPass(Registry);
initializePGOMemOPSizeOptLegacyPassPass(Registry);
initializeCGProfileLegacyPassPass(Registry);
initializeInstrOrderFileLegacyPassPass(Registry);
initializeInstrProfilingLegacyPassPass(Registry);
initializeMemorySanitizerLegacyPassPass(Registry);
initializeHWAddressSanitizerLegacyPassPass(Registry);
initializeThreadSanitizerLegacyPassPass(Registry);
initializeModuleSanitizerCoverageLegacyPassPass(Registry);
initializeDataFlowSanitizerLegacyPassPass(Registry);
}
/// LLVMInitializeInstrumentation - C binding for
/// initializeInstrumentation.
void LLVMInitializeInstrumentation(LLVMPassRegistryRef R) {
initializeInstrumentation(*unwrap(R));
}
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