96 lines
3.3 KiB
C++
96 lines
3.3 KiB
C++
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//===- PseudoProbeInserter.cpp - Insert annotation for callsite profiling -===//
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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 implements PseudoProbeInserter pass, which inserts pseudo probe
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// annotations for call instructions with a pseudo-probe-specific dwarf
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// discriminator. such discriminator indicates that the call instruction comes
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// with a pseudo probe, and the discriminator value holds information to
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// identify the corresponding counter.
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineBasicBlock.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/TargetInstrInfo.h"
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#include "llvm/IR/DebugInfoMetadata.h"
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#include "llvm/IR/PseudoProbe.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Target/TargetMachine.h"
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#include <unordered_map>
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#define DEBUG_TYPE "pseudo-probe-inserter"
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using namespace llvm;
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namespace {
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class PseudoProbeInserter : public MachineFunctionPass {
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public:
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static char ID;
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PseudoProbeInserter() : MachineFunctionPass(ID) {
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initializePseudoProbeInserterPass(*PassRegistry::getPassRegistry());
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}
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StringRef getPassName() const override { return "Pseudo Probe Inserter"; }
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.setPreservesAll();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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bool runOnMachineFunction(MachineFunction &MF) override {
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const TargetInstrInfo *TII = MF.getSubtarget().getInstrInfo();
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bool Changed = false;
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for (MachineBasicBlock &MBB : MF) {
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for (MachineInstr &MI : MBB) {
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if (MI.isCall()) {
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if (DILocation *DL = MI.getDebugLoc()) {
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auto Value = DL->getDiscriminator();
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if (DILocation::isPseudoProbeDiscriminator(Value)) {
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BuildMI(MBB, MI, DL, TII->get(TargetOpcode::PSEUDO_PROBE))
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.addImm(getFuncGUID(MF.getFunction().getParent(), DL))
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.addImm(
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PseudoProbeDwarfDiscriminator::extractProbeIndex(Value))
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.addImm(
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PseudoProbeDwarfDiscriminator::extractProbeType(Value))
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.addImm(PseudoProbeDwarfDiscriminator::extractProbeAttributes(
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Value));
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Changed = true;
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}
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}
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}
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}
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}
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return Changed;
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}
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private:
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uint64_t getFuncGUID(Module *M, DILocation *DL) {
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auto *SP = DL->getScope()->getSubprogram();
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auto Name = SP->getLinkageName();
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if (Name.empty())
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Name = SP->getName();
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return Function::getGUID(Name);
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}
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};
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} // namespace
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char PseudoProbeInserter::ID = 0;
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INITIALIZE_PASS_BEGIN(PseudoProbeInserter, DEBUG_TYPE,
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"Insert pseudo probe annotations for value profiling",
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false, false)
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INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
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INITIALIZE_PASS_END(PseudoProbeInserter, DEBUG_TYPE,
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"Insert pseudo probe annotations for value profiling",
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false, false)
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FunctionPass *llvm::createPseudoProbeInserter() {
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return new PseudoProbeInserter();
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}
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