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//===-- WebAssemblyCleanCodeAfterTrap.cpp - Clean Code After Trap ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file remove instruction after trap.
/// ``llvm.trap`` will be convert as ``unreachable`` which is terminator.
/// Instruction after terminator will cause validation failed.
///
//===----------------------------------------------------------------------===//
#include "WebAssembly.h"
#include "WebAssemblyUtilities.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "wasm-clean-code-after-trap"
namespace {
class WebAssemblyCleanCodeAfterTrap final : public MachineFunctionPass {
public:
static char ID; // Pass identification, replacement for typeid
WebAssemblyCleanCodeAfterTrap() : MachineFunctionPass(ID) {}
StringRef getPassName() const override {
return "WebAssembly Clean Code After Trap";
}
bool runOnMachineFunction(MachineFunction &MF) override;
};
} // end anonymous namespace
char WebAssemblyCleanCodeAfterTrap::ID = 0;
INITIALIZE_PASS(WebAssemblyCleanCodeAfterTrap, DEBUG_TYPE,
"WebAssembly Clean Code After Trap", false, false)
FunctionPass *llvm::createWebAssemblyCleanCodeAfterTrap() {
return new WebAssemblyCleanCodeAfterTrap();
}
bool WebAssemblyCleanCodeAfterTrap::runOnMachineFunction(MachineFunction &MF) {
LLVM_DEBUG({
dbgs() << "********** CleanCodeAfterTrap **********\n"
<< "********** Function: " << MF.getName() << '\n';
});
bool Changed = false;
for (MachineBasicBlock &BB : MF) {
bool HasTerminator = false;
llvm::SmallVector<MachineInstr *> RemoveMI{};
for (MachineInstr &MI : BB) {
if (HasTerminator)
RemoveMI.push_back(&MI);
if (MI.hasProperty(MCID::Trap) && MI.isTerminator())
HasTerminator = true;
}
if (!RemoveMI.empty()) {
Changed = true;
LLVM_DEBUG({
for (MachineInstr *MI : RemoveMI) {
llvm::dbgs() << "* remove ";
MI->print(llvm::dbgs());
}
});
for (MachineInstr *MI : RemoveMI)
MI->eraseFromParent();
}
}
return Changed;
}
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