| //===- LiveDebugValues.cpp - Tracking Debug Value MIs ---------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "LiveDebugValues.h" |
| |
| #include "llvm/CodeGen/MachineBasicBlock.h" |
| #include "llvm/CodeGen/MachineFrameInfo.h" |
| #include "llvm/CodeGen/MachineFunctionPass.h" |
| #include "llvm/CodeGen/Passes.h" |
| #include "llvm/InitializePasses.h" |
| #include "llvm/Pass.h" |
| #include "llvm/Target/TargetMachine.h" |
| |
| /// \file LiveDebugValues.cpp |
| /// |
| /// The LiveDebugValues pass extends the range of variable locations |
| /// (specified by DBG_VALUE instructions) from single blocks to successors |
| /// and any other code locations where the variable location is valid. |
| /// There are currently two implementations: the "VarLoc" implementation |
| /// explicitly tracks the location of a variable, while the "InstrRef" |
| /// implementation tracks the values defined by instructions through locations. |
| /// |
| /// This file implements neither; it merely registers the pass, allows the |
| /// user to pick which implementation will be used to propagate variable |
| /// locations. |
| |
| #define DEBUG_TYPE "livedebugvalues" |
| |
| using namespace llvm; |
| |
| /// Generic LiveDebugValues pass. Calls through to VarLocBasedLDV or |
| /// InstrRefBasedLDV to perform location propagation, via the LDVImpl |
| /// base class. |
| class LiveDebugValues : public MachineFunctionPass { |
| public: |
| static char ID; |
| |
| LiveDebugValues(); |
| ~LiveDebugValues() { |
| if (TheImpl) |
| delete TheImpl; |
| } |
| |
| /// Calculate the liveness information for the given machine function. |
| bool runOnMachineFunction(MachineFunction &MF) override; |
| |
| MachineFunctionProperties getRequiredProperties() const override { |
| return MachineFunctionProperties().set( |
| MachineFunctionProperties::Property::NoVRegs); |
| } |
| |
| void getAnalysisUsage(AnalysisUsage &AU) const override { |
| AU.setPreservesCFG(); |
| MachineFunctionPass::getAnalysisUsage(AU); |
| } |
| |
| private: |
| LDVImpl *TheImpl; |
| TargetPassConfig *TPC; |
| }; |
| |
| char LiveDebugValues::ID = 0; |
| |
| char &llvm::LiveDebugValuesID = LiveDebugValues::ID; |
| |
| INITIALIZE_PASS(LiveDebugValues, DEBUG_TYPE, "Live DEBUG_VALUE analysis", false, |
| false) |
| |
| /// Default construct and initialize the pass. |
| LiveDebugValues::LiveDebugValues() : MachineFunctionPass(ID) { |
| initializeLiveDebugValuesPass(*PassRegistry::getPassRegistry()); |
| TheImpl = nullptr; |
| } |
| |
| bool LiveDebugValues::runOnMachineFunction(MachineFunction &MF) { |
| if (!TheImpl) { |
| TPC = getAnalysisIfAvailable<TargetPassConfig>(); |
| |
| bool InstrRefBased = false; |
| if (TPC) { |
| auto &TM = TPC->getTM<TargetMachine>(); |
| InstrRefBased = TM.Options.ValueTrackingVariableLocations; |
| } |
| |
| if (InstrRefBased) |
| TheImpl = llvm::makeInstrRefBasedLiveDebugValues(); |
| else |
| TheImpl = llvm::makeVarLocBasedLiveDebugValues(); |
| } |
| |
| return TheImpl->ExtendRanges(MF, TPC); |
| } |