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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
126 lines
5.0 KiB
C++
126 lines
5.0 KiB
C++
//===-- Instrumentation.cpp - TransformUtils Infrastructure ---------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the common initialization infrastructure for the
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// Instrumentation library.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Instrumentation.h"
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#include "llvm-c/Initialization.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/Module.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/PassRegistry.h"
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using namespace llvm;
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/// Moves I before IP. Returns new insert point.
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static BasicBlock::iterator moveBeforeInsertPoint(BasicBlock::iterator I, BasicBlock::iterator IP) {
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// If I is IP, move the insert point down.
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if (I == IP)
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return ++IP;
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// Otherwise, move I before IP and return IP.
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I->moveBefore(&*IP);
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return IP;
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}
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/// Instrumentation passes often insert conditional checks into entry blocks.
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/// Call this function before splitting the entry block to move instructions
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/// that must remain in the entry block up before the split point. Static
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/// allocas and llvm.localescape calls, for example, must remain in the entry
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/// block.
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BasicBlock::iterator llvm::PrepareToSplitEntryBlock(BasicBlock &BB,
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BasicBlock::iterator IP) {
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assert(&BB.getParent()->getEntryBlock() == &BB);
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for (auto I = IP, E = BB.end(); I != E; ++I) {
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bool KeepInEntry = false;
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if (auto *AI = dyn_cast<AllocaInst>(I)) {
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if (AI->isStaticAlloca())
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KeepInEntry = true;
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} else if (auto *II = dyn_cast<IntrinsicInst>(I)) {
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if (II->getIntrinsicID() == llvm::Intrinsic::localescape)
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KeepInEntry = true;
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}
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if (KeepInEntry)
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IP = moveBeforeInsertPoint(I, IP);
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}
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return IP;
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}
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// Create a constant for Str so that we can pass it to the run-time lib.
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GlobalVariable *llvm::createPrivateGlobalForString(Module &M, StringRef Str,
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bool AllowMerging,
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const char *NamePrefix) {
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Constant *StrConst = ConstantDataArray::getString(M.getContext(), Str);
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// We use private linkage for module-local strings. If they can be merged
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// with another one, we set the unnamed_addr attribute.
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GlobalVariable *GV =
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new GlobalVariable(M, StrConst->getType(), true,
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GlobalValue::PrivateLinkage, StrConst, NamePrefix);
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if (AllowMerging)
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GV->setUnnamedAddr(GlobalValue::UnnamedAddr::Global);
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GV->setAlignment(1); // Strings may not be merged w/o setting align 1.
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return GV;
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}
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Comdat *llvm::GetOrCreateFunctionComdat(Function &F, Triple &T,
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const std::string &ModuleId) {
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if (auto Comdat = F.getComdat()) return Comdat;
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assert(F.hasName());
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Module *M = F.getParent();
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std::string Name = F.getName();
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// Make a unique comdat name for internal linkage things on ELF. On COFF, the
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// name of the comdat group identifies the leader symbol of the comdat group.
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// The linkage of the leader symbol is considered during comdat resolution,
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// and internal symbols with the same name from different objects will not be
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// merged.
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if (T.isOSBinFormatELF() && F.hasLocalLinkage()) {
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if (ModuleId.empty())
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return nullptr;
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Name += ModuleId;
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}
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// Make a new comdat for the function. Use the "no duplicates" selection kind
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// for non-weak symbols if the object file format supports it.
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Comdat *C = M->getOrInsertComdat(Name);
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if (T.isOSBinFormatCOFF() && !F.isWeakForLinker())
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C->setSelectionKind(Comdat::NoDuplicates);
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F.setComdat(C);
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return C;
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}
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/// initializeInstrumentation - Initialize all passes in the TransformUtils
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/// library.
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void llvm::initializeInstrumentation(PassRegistry &Registry) {
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initializeAddressSanitizerPass(Registry);
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initializeAddressSanitizerModulePass(Registry);
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initializeBoundsCheckingLegacyPassPass(Registry);
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initializeControlHeightReductionLegacyPassPass(Registry);
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initializeGCOVProfilerLegacyPassPass(Registry);
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initializePGOInstrumentationGenLegacyPassPass(Registry);
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initializePGOInstrumentationUseLegacyPassPass(Registry);
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initializePGOIndirectCallPromotionLegacyPassPass(Registry);
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initializePGOMemOPSizeOptLegacyPassPass(Registry);
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initializeInstrProfilingLegacyPassPass(Registry);
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initializeMemorySanitizerLegacyPassPass(Registry);
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initializeHWAddressSanitizerPass(Registry);
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initializeThreadSanitizerLegacyPassPass(Registry);
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initializeSanitizerCoverageModulePass(Registry);
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initializeDataFlowSanitizerPass(Registry);
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initializeEfficiencySanitizerPass(Registry);
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}
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/// LLVMInitializeInstrumentation - C binding for
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/// initializeInstrumentation.
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void LLVMInitializeInstrumentation(LLVMPassRegistryRef R) {
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initializeInstrumentation(*unwrap(R));
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}
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