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195 lines
7.9 KiB
C++
195 lines
7.9 KiB
C++
//===- lib/CodeGen/MachineStableHash.cpp ----------------------------------===//
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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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// Stable hashing for MachineInstr and MachineOperand. Useful or getting a
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// hash across runs, modules, etc.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineStableHash.h"
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Analysis/Loads.h"
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#include "llvm/Analysis/MemoryLocation.h"
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#include "llvm/CodeGen/MIRFormatter.h"
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#include "llvm/CodeGen/MIRPrinter.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineJumpTableInfo.h"
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#include "llvm/CodeGen/MachineOperand.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/StableHashing.h"
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#include "llvm/CodeGen/TargetInstrInfo.h"
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#include "llvm/CodeGen/TargetRegisterInfo.h"
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#include "llvm/Config/llvm-config.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/IRPrintingPasses.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/ModuleSlotTracker.h"
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#include "llvm/MC/MCDwarf.h"
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#include "llvm/Target/TargetIntrinsicInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#define DEBUG_TYPE "machine-stable-hash"
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using namespace llvm;
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STATISTIC(StableHashBailingMachineBasicBlock,
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"Number of encountered unsupported MachineOperands that were "
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"MachineBasicBlocks while computing stable hashes");
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STATISTIC(StableHashBailingConstantPoolIndex,
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"Number of encountered unsupported MachineOperands that were "
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"ConstantPoolIndex while computing stable hashes");
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STATISTIC(StableHashBailingTargetIndexNoName,
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"Number of encountered unsupported MachineOperands that were "
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"TargetIndex with no name");
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STATISTIC(StableHashBailingGlobalAddress,
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"Number of encountered unsupported MachineOperands that were "
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"GlobalAddress while computing stable hashes");
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STATISTIC(StableHashBailingBlockAddress,
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"Number of encountered unsupported MachineOperands that were "
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"BlockAddress while computing stable hashes");
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STATISTIC(StableHashBailingMetadataUnsupported,
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"Number of encountered unsupported MachineOperands that were "
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"Metadata of an unsupported kind while computing stable hashes");
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stable_hash llvm::stableHashValue(const MachineOperand &MO) {
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switch (MO.getType()) {
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case MachineOperand::MO_Register:
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if (Register::isVirtualRegister(MO.getReg())) {
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const MachineRegisterInfo &MRI = MO.getParent()->getMF()->getRegInfo();
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return MRI.getVRegDef(MO.getReg())->getOpcode();
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}
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// Register operands don't have target flags.
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return stable_hash_combine(MO.getType(), MO.getReg(), MO.getSubReg(),
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MO.isDef());
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case MachineOperand::MO_Immediate:
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return stable_hash_combine(MO.getType(), MO.getTargetFlags(), MO.getImm());
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case MachineOperand::MO_CImmediate:
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case MachineOperand::MO_FPImmediate: {
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auto Val = MO.isCImm() ? MO.getCImm()->getValue()
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: MO.getFPImm()->getValueAPF().bitcastToAPInt();
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auto ValHash =
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stable_hash_combine_array(Val.getRawData(), Val.getNumWords());
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return hash_combine(MO.getType(), MO.getTargetFlags(), ValHash);
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}
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case MachineOperand::MO_MachineBasicBlock:
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StableHashBailingMachineBasicBlock++;
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return 0;
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case MachineOperand::MO_ConstantPoolIndex:
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StableHashBailingConstantPoolIndex++;
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return 0;
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case MachineOperand::MO_BlockAddress:
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StableHashBailingBlockAddress++;
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return 0;
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case MachineOperand::MO_Metadata:
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StableHashBailingMetadataUnsupported++;
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return 0;
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case MachineOperand::MO_GlobalAddress:
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StableHashBailingGlobalAddress++;
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return 0;
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case MachineOperand::MO_TargetIndex: {
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if (const char *Name = MO.getTargetIndexName())
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return stable_hash_combine(MO.getType(), MO.getTargetFlags(),
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stable_hash_combine_string(Name),
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MO.getOffset());
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StableHashBailingTargetIndexNoName++;
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return 0;
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}
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case MachineOperand::MO_FrameIndex:
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case MachineOperand::MO_JumpTableIndex:
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return stable_hash_combine(MO.getType(), MO.getTargetFlags(),
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MO.getIndex());
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case MachineOperand::MO_ExternalSymbol:
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return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getOffset(),
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stable_hash_combine_string(MO.getSymbolName()));
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case MachineOperand::MO_RegisterMask:
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case MachineOperand::MO_RegisterLiveOut:
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return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getRegMask());
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case MachineOperand::MO_ShuffleMask: {
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std::vector<llvm::stable_hash> ShuffleMaskHashes;
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llvm::transform(
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MO.getShuffleMask(), std::back_inserter(ShuffleMaskHashes),
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[](int S) -> llvm::stable_hash { return llvm::stable_hash(S); });
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return hash_combine(MO.getType(), MO.getTargetFlags(),
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stable_hash_combine_array(ShuffleMaskHashes.data(),
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ShuffleMaskHashes.size()));
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}
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case MachineOperand::MO_MCSymbol: {
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auto SymbolName = MO.getMCSymbol()->getName();
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return hash_combine(MO.getType(), MO.getTargetFlags(),
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stable_hash_combine_string(SymbolName));
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}
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case MachineOperand::MO_CFIIndex:
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return stable_hash_combine(MO.getType(), MO.getTargetFlags(),
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MO.getCFIIndex());
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case MachineOperand::MO_IntrinsicID:
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return stable_hash_combine(MO.getType(), MO.getTargetFlags(),
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MO.getIntrinsicID());
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case MachineOperand::MO_Predicate:
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return stable_hash_combine(MO.getType(), MO.getTargetFlags(),
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MO.getPredicate());
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}
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llvm_unreachable("Invalid machine operand type");
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}
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/// A stable hash value for machine instructions.
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/// Returns 0 if no stable hash could be computed.
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/// The hashing and equality testing functions ignore definitions so this is
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/// useful for CSE, etc.
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stable_hash llvm::stableHashValue(const MachineInstr &MI, bool HashVRegs,
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bool HashConstantPoolIndices,
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bool HashMemOperands) {
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// Build up a buffer of hash code components.
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SmallVector<stable_hash, 16> HashComponents;
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HashComponents.reserve(MI.getNumOperands() + MI.getNumMemOperands() + 2);
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HashComponents.push_back(MI.getOpcode());
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HashComponents.push_back(MI.getFlags());
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for (const MachineOperand &MO : MI.operands()) {
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if (!HashVRegs && MO.isReg() && MO.isDef() &&
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Register::isVirtualRegister(MO.getReg()))
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continue; // Skip virtual register defs.
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if (MO.isCPI()) {
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HashComponents.push_back(stable_hash_combine(
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MO.getType(), MO.getTargetFlags(), MO.getIndex()));
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continue;
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}
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stable_hash StableHash = stableHashValue(MO);
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if (!StableHash)
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return 0;
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HashComponents.push_back(StableHash);
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}
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for (const auto *Op : MI.memoperands()) {
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if (!HashMemOperands)
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break;
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HashComponents.push_back(static_cast<unsigned>(Op->getSize()));
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HashComponents.push_back(static_cast<unsigned>(Op->getFlags()));
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HashComponents.push_back(static_cast<unsigned>(Op->getOffset()));
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HashComponents.push_back(static_cast<unsigned>(Op->getOrdering()));
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HashComponents.push_back(static_cast<unsigned>(Op->getAddrSpace()));
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HashComponents.push_back(static_cast<unsigned>(Op->getSyncScopeID()));
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HashComponents.push_back(static_cast<unsigned>(Op->getBaseAlign().value()));
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HashComponents.push_back(static_cast<unsigned>(Op->getFailureOrdering()));
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}
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return stable_hash_combine_range(HashComponents.begin(),
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HashComponents.end());
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}
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