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| 1 | +//===-- WebAssemblyCleanCodeAfterTrap.cpp - Clean Code After Trap ---------===// |
| 2 | +// |
| 3 | +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | +// See https://llvm.org/LICENSE.txt for license information. |
| 5 | +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | +// |
| 7 | +//===----------------------------------------------------------------------===// |
| 8 | +/// |
| 9 | +/// \file |
| 10 | +/// This file remove instruction after trap. |
| 11 | +/// ``llvm.trap`` will be convert as ``unreachable`` which is terminator. |
| 12 | +/// Instruction after terminator will cause validation failed. |
| 13 | +/// |
| 14 | +//===----------------------------------------------------------------------===// |
| 15 | + |
| 16 | +#include "WebAssembly.h" |
| 17 | +#include "WebAssemblyUtilities.h" |
| 18 | +#include "llvm/ADT/SmallVector.h" |
| 19 | +#include "llvm/CodeGen/MachineBlockFrequencyInfo.h" |
| 20 | +#include "llvm/CodeGen/Passes.h" |
| 21 | +#include "llvm/MC/MCInstrDesc.h" |
| 22 | +#include "llvm/Support/Debug.h" |
| 23 | +#include "llvm/Support/raw_ostream.h" |
| 24 | +using namespace llvm; |
| 25 | + |
| 26 | +#define DEBUG_TYPE "wasm-clean-code-after-trap" |
| 27 | + |
| 28 | +namespace { |
| 29 | +class WebAssemblyCleanCodeAfterTrap final : public MachineFunctionPass { |
| 30 | +public: |
| 31 | + static char ID; // Pass identification, replacement for typeid |
| 32 | + WebAssemblyCleanCodeAfterTrap() : MachineFunctionPass(ID) {} |
| 33 | + |
| 34 | + StringRef getPassName() const override { |
| 35 | + return "WebAssembly Clean Code After Trap"; |
| 36 | + } |
| 37 | + |
| 38 | + bool runOnMachineFunction(MachineFunction &MF) override; |
| 39 | +}; |
| 40 | +} // end anonymous namespace |
| 41 | + |
| 42 | +char WebAssemblyCleanCodeAfterTrap::ID = 0; |
| 43 | +INITIALIZE_PASS(WebAssemblyCleanCodeAfterTrap, DEBUG_TYPE, |
| 44 | + "WebAssembly Clean Code After Trap", false, false) |
| 45 | + |
| 46 | +FunctionPass *llvm::createWebAssemblyCleanCodeAfterTrap() { |
| 47 | + return new WebAssemblyCleanCodeAfterTrap(); |
| 48 | +} |
| 49 | + |
| 50 | +bool WebAssemblyCleanCodeAfterTrap::runOnMachineFunction(MachineFunction &MF) { |
| 51 | + LLVM_DEBUG({ |
| 52 | + dbgs() << "********** CleanCodeAfterTrap **********\n" |
| 53 | + << "********** Function: " << MF.getName() << '\n'; |
| 54 | + }); |
| 55 | + |
| 56 | + bool Changed = false; |
| 57 | + |
| 58 | + for (MachineBasicBlock &BB : MF) { |
| 59 | + bool HasTerminator = false; |
| 60 | + llvm::SmallVector<MachineInstr *> RemoveMI{}; |
| 61 | + for (MachineInstr &MI : BB) { |
| 62 | + if (HasTerminator) |
| 63 | + RemoveMI.push_back(&MI); |
| 64 | + if (MI.hasProperty(MCID::Trap) && MI.isTerminator()) |
| 65 | + HasTerminator = true; |
| 66 | + } |
| 67 | + if (!RemoveMI.empty()) { |
| 68 | + Changed = true; |
| 69 | + LLVM_DEBUG({ |
| 70 | + for (MachineInstr *MI : RemoveMI) { |
| 71 | + llvm::dbgs() << "* remove "; |
| 72 | + MI->print(llvm::dbgs()); |
| 73 | + } |
| 74 | + }); |
| 75 | + for (MachineInstr *MI : RemoveMI) |
| 76 | + MI->eraseFromParent(); |
| 77 | + } |
| 78 | + } |
| 79 | + return Changed; |
| 80 | +} |
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