forked from OSchip/llvm-project
92 lines
3.4 KiB
C++
92 lines
3.4 KiB
C++
//===-- WebAssemblyDebugValueManager.cpp - WebAssembly DebugValue Manager -===//
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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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/// \file
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/// This file implements the manager for MachineInstr DebugValues.
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///
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//===----------------------------------------------------------------------===//
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#include "WebAssemblyDebugValueManager.h"
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#include "WebAssembly.h"
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#include "WebAssemblyMachineFunctionInfo.h"
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#include "llvm/CodeGen/MachineInstr.h"
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using namespace llvm;
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WebAssemblyDebugValueManager::WebAssemblyDebugValueManager(
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MachineInstr *Instr) {
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const auto *MF = Instr->getParent()->getParent();
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const auto *TII = MF->getSubtarget<WebAssemblySubtarget>().getInstrInfo();
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// This code differs from MachineInstr::collectDebugValues in that it scans
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// the whole BB, not just contiguous DBG_VALUEs.
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if (!Instr->getOperand(0).isReg())
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return;
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CurrentReg = Instr->getOperand(0).getReg();
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SmallVector<MachineInstr *, 2> DbgValueLists;
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MachineBasicBlock::iterator DI = *Instr;
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++DI;
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for (MachineBasicBlock::iterator DE = Instr->getParent()->end(); DI != DE;
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++DI) {
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if (DI->isDebugValue() &&
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DI->hasDebugOperandForReg(Instr->getOperand(0).getReg()))
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DI->getOpcode() == TargetOpcode::DBG_VALUE
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? DbgValues.push_back(&*DI)
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: DbgValueLists.push_back(&*DI);
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}
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// This class currently cannot handle DBG_VALUE_LISTs correctly. So this
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// converts DBG_VALUE_LISTs to "DBG_VALUE $noreg", which will appear as
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// "optimized out". This can invalidate existing iterators pointing to
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// instructions within this BB from the caller.
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// See https://bugs.llvm.org/show_bug.cgi?id=50361
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// TODO Correctly handle DBG_VALUE_LISTs
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for (auto *DVL : DbgValueLists) {
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BuildMI(*DVL->getParent(), DVL, DVL->getDebugLoc(),
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TII->get(TargetOpcode::DBG_VALUE), false, Register(),
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DVL->getOperand(0).getMetadata(), DVL->getOperand(1).getMetadata());
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DVL->eraseFromParent();
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}
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}
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void WebAssemblyDebugValueManager::move(MachineInstr *Insert) {
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MachineBasicBlock *MBB = Insert->getParent();
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for (MachineInstr *DBI : reverse(DbgValues))
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MBB->splice(Insert, DBI->getParent(), DBI);
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}
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void WebAssemblyDebugValueManager::updateReg(unsigned Reg) {
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for (auto *DBI : DbgValues)
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for (auto &MO : DBI->getDebugOperandsForReg(CurrentReg))
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MO.setReg(Reg);
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CurrentReg = Reg;
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}
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void WebAssemblyDebugValueManager::clone(MachineInstr *Insert,
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unsigned NewReg) {
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MachineBasicBlock *MBB = Insert->getParent();
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MachineFunction *MF = MBB->getParent();
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for (MachineInstr *DBI : reverse(DbgValues)) {
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MachineInstr *Clone = MF->CloneMachineInstr(DBI);
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for (auto &MO : Clone->getDebugOperandsForReg(CurrentReg))
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MO.setReg(NewReg);
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MBB->insert(Insert, Clone);
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}
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}
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void WebAssemblyDebugValueManager::replaceWithLocal(unsigned LocalId) {
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for (auto *DBI : DbgValues) {
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auto IndexType = DBI->isIndirectDebugValue()
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? llvm::WebAssembly::TI_LOCAL_INDIRECT
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: llvm::WebAssembly::TI_LOCAL;
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for (auto &MO : DBI->getDebugOperandsForReg(CurrentReg))
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MO.ChangeToTargetIndex(IndexType, LocalId);
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}
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}
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