forked from OSchip/llvm-project
70 lines
2.6 KiB
C++
70 lines
2.6 KiB
C++
//=== WebAssemblyNullifyDebugValueLists.cpp - Nullify DBG_VALUE_LISTs ---===//
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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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/// Nullify DBG_VALUE_LISTs instructions as a temporary measure before we
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/// implement DBG_VALUE_LIST handling in WebAssemblyDebugValueManager.
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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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///
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//===----------------------------------------------------------------------===//
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#include "WebAssembly.h"
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#include "WebAssemblySubtarget.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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using namespace llvm;
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#define DEBUG_TYPE "wasm-nullify-dbg-value-lists"
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namespace {
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class WebAssemblyNullifyDebugValueLists final : public MachineFunctionPass {
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StringRef getPassName() const override {
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return "WebAssembly Nullify DBG_VALUE_LISTs";
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}
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bool runOnMachineFunction(MachineFunction &MF) override;
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public:
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static char ID; // Pass identification, replacement for typeid
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WebAssemblyNullifyDebugValueLists() : MachineFunctionPass(ID) {}
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};
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} // end anonymous namespace
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char WebAssemblyNullifyDebugValueLists::ID = 0;
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INITIALIZE_PASS(WebAssemblyNullifyDebugValueLists, DEBUG_TYPE,
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"WebAssembly Nullify DBG_VALUE_LISTs", false, false)
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FunctionPass *llvm::createWebAssemblyNullifyDebugValueLists() {
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return new WebAssemblyNullifyDebugValueLists();
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}
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bool WebAssemblyNullifyDebugValueLists::runOnMachineFunction(
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MachineFunction &MF) {
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LLVM_DEBUG(dbgs() << "********** Nullify DBG_VALUE_LISTs **********\n"
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"********** Function: "
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<< MF.getName() << '\n');
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const auto &TII = *MF.getSubtarget<WebAssemblySubtarget>().getInstrInfo();
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SmallVector<MachineInstr *, 2> DbgValueLists;
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for (auto &MBB : MF)
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for (auto &MI : MBB)
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if (MI.getOpcode() == TargetOpcode::DBG_VALUE_LIST)
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DbgValueLists.push_back(&MI);
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// Our backend, including WebAssemblyDebugValueManager, currently cannot
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// handle DBG_VALUE_LISTs correctly. So this converts DBG_VALUE_LISTs to
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// "DBG_VALUE $noreg", which will appear as "optimized out".
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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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return !DbgValueLists.empty();
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}
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