65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
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//=== 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://github.com/llvm/llvm-project/issues/49705.
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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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bool Changed = false;
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// Our backend, including WebAssemblyDebugValueManager, currently cannot
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// handle DBG_VALUE_LISTs correctly. So this makes them undefined, which will
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// appear as "optimized out".
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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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MI.setDebugValueUndef();
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Changed = true;
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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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