62ef97e063
Remove C APIs for interacting with PassRegistry and pass initialization. These are legacy PM concepts, and are no longer relevant for the new pass manager. Calls to these initialization functions can simply be dropped. Differential Revision: https://reviews.llvm.org/D145043
88 lines
3.3 KiB
C++
88 lines
3.3 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/IR/IntrinsicInst.h"
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#include "llvm/IR/Module.h"
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#include "llvm/TargetParser/Triple.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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++IP;
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} else {
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// Otherwise, move I before IP and return IP.
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I->moveBefore(&*IP);
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}
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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(Align(1)); // Strings may not be merged w/o setting
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// alignment explicitly.
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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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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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// Make a new comdat for the function. Use the "no duplicates" selection kind
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// if the object file format supports it. For COFF we restrict it to non-weak
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// symbols.
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Comdat *C = M->getOrInsertComdat(F.getName());
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if (T.isOSBinFormatELF() || (T.isOSBinFormatCOFF() && !F.isWeakForLinker()))
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C->setSelectionKind(Comdat::NoDeduplicate);
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F.setComdat(C);
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return C;
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}
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