1a46229636
`llvm.trap` will be convert as unreachable which is terminator. Instruction after terminator will cause validation failed. This PR introduces a pass to clean instruction after terminator. Fixes: https://github.com/llvm/llvm-project/issues/68770 Reapply: #90207
81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
//===-- WebAssemblyCleanCodeAfterTrap.cpp - Clean Code After Trap ---------===//
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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 remove instruction after trap.
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/// ``llvm.trap`` will be convert as ``unreachable`` which is terminator.
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/// Instruction after terminator will cause validation failed.
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///
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//===----------------------------------------------------------------------===//
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#include "WebAssembly.h"
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#include "WebAssemblyUtilities.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/MC/MCInstrDesc.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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#define DEBUG_TYPE "wasm-clean-code-after-trap"
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namespace {
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class WebAssemblyCleanCodeAfterTrap final : public MachineFunctionPass {
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public:
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static char ID; // Pass identification, replacement for typeid
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WebAssemblyCleanCodeAfterTrap() : MachineFunctionPass(ID) {}
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StringRef getPassName() const override {
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return "WebAssembly Clean Code After Trap";
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}
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bool runOnMachineFunction(MachineFunction &MF) override;
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};
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} // end anonymous namespace
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char WebAssemblyCleanCodeAfterTrap::ID = 0;
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INITIALIZE_PASS(WebAssemblyCleanCodeAfterTrap, DEBUG_TYPE,
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"WebAssembly Clean Code After Trap", false, false)
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FunctionPass *llvm::createWebAssemblyCleanCodeAfterTrap() {
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return new WebAssemblyCleanCodeAfterTrap();
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}
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bool WebAssemblyCleanCodeAfterTrap::runOnMachineFunction(MachineFunction &MF) {
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LLVM_DEBUG({
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dbgs() << "********** CleanCodeAfterTrap **********\n"
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<< "********** Function: " << MF.getName() << '\n';
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});
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bool Changed = false;
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for (MachineBasicBlock &BB : MF) {
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bool HasTerminator = false;
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llvm::SmallVector<MachineInstr *> RemoveMI{};
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for (MachineInstr &MI : BB) {
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if (HasTerminator)
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RemoveMI.push_back(&MI);
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if (MI.hasProperty(MCID::Trap) && MI.isTerminator())
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HasTerminator = true;
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}
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if (!RemoveMI.empty()) {
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Changed = true;
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LLVM_DEBUG({
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for (MachineInstr *MI : RemoveMI) {
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llvm::dbgs() << "* remove ";
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MI->print(llvm::dbgs());
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}
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});
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for (MachineInstr *MI : RemoveMI)
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MI->eraseFromParent();
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}
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}
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return Changed;
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}
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