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Current Path: /usr/src/contrib/llvm-project/llvm/lib/Target/WebAssembly

usr / src / contrib / llvm-project / llvm / lib / Target / WebAssembly /

📁 ..
📁 AsmParser
📁 Disassembler
📁 MCTargetDesc
📄 README.txt(8.34 KB)
📁 TargetInfo
📄 WebAssembly.h(4.05 KB)
📄 WebAssembly.td(4.85 KB)
📄 WebAssemblyAddMissingPrototypes.cpp(5.41 KB)
📄 WebAssemblyArgumentMove.cpp(3.36 KB)
📄 WebAssemblyAsmPrinter.cpp(16.09 KB)
📄 WebAssemblyAsmPrinter.h(3.12 KB)
📄 WebAssemblyCFGSort.cpp(15.94 KB)
📄 WebAssemblyCFGStackify.cpp(55.56 KB)
📄 WebAssemblyDebugFixup.cpp(5.4 KB)
📄 WebAssemblyDebugValueManager.cpp(1.77 KB)
📄 WebAssemblyDebugValueManager.h(1.13 KB)
📄 WebAssemblyExceptionInfo.cpp(6.23 KB)
📄 WebAssemblyExceptionInfo.h(6.24 KB)
📄 WebAssemblyExplicitLocals.cpp(15.04 KB)
📄 WebAssemblyFastISel.cpp(40.39 KB)
📄 WebAssemblyFixBrTableDefaults.cpp(5.81 KB)
📄 WebAssemblyFixFunctionBitcasts.cpp(12.59 KB)
📄 WebAssemblyFixIrreducibleControlFlow.cpp(18.91 KB)
📄 WebAssemblyFrameLowering.cpp(12.68 KB)
📄 WebAssemblyFrameLowering.h(2.98 KB)
📄 WebAssemblyISD.def(1.17 KB)
📄 WebAssemblyISelDAGToDAG.cpp(9.08 KB)
📄 WebAssemblyISelLowering.cpp(68.59 KB)
📄 WebAssemblyISelLowering.h(5.85 KB)
📄 WebAssemblyInstrAtomics.td(48.5 KB)
📄 WebAssemblyInstrBulkMemory.td(2.84 KB)
📄 WebAssemblyInstrCall.td(3.21 KB)
📄 WebAssemblyInstrControl.td(7.93 KB)
📄 WebAssemblyInstrConv.td(14.1 KB)
📄 WebAssemblyInstrFloat.td(6.03 KB)
📄 WebAssemblyInstrFormats.td(3.1 KB)
📄 WebAssemblyInstrInfo.cpp(8.21 KB)
📄 WebAssemblyInstrInfo.h(2.63 KB)
📄 WebAssemblyInstrInfo.td(14.37 KB)
📄 WebAssemblyInstrInteger.td(6.05 KB)
📄 WebAssemblyInstrMemory.td(18.63 KB)
📄 WebAssemblyInstrRef.td(1.15 KB)
📄 WebAssemblyInstrSIMD.td(39.08 KB)
📄 WebAssemblyLateEHPrepare.cpp(14.57 KB)
📄 WebAssemblyLowerBrUnless.cpp(6.21 KB)
📄 WebAssemblyLowerEmscriptenEHSjLj.cpp(45.45 KB)
📄 WebAssemblyLowerGlobalDtors.cpp(7.79 KB)
📄 WebAssemblyMCInstLower.cpp(13.72 KB)
📄 WebAssemblyMCInstLower.h(1.63 KB)
📄 WebAssemblyMachineFunctionInfo.cpp(4.29 KB)
📄 WebAssemblyMachineFunctionInfo.h(6.75 KB)
📄 WebAssemblyMemIntrinsicResults.cpp(7.39 KB)
📄 WebAssemblyOptimizeLiveIntervals.cpp(4.61 KB)
📄 WebAssemblyOptimizeReturned.cpp(2.46 KB)
📄 WebAssemblyPeephole.cpp(6.33 KB)
📄 WebAssemblyPrepareForLiveIntervals.cpp(4.34 KB)
📄 WebAssemblyRegColoring.cpp(6.37 KB)
📄 WebAssemblyRegNumbering.cpp(3.86 KB)
📄 WebAssemblyRegStackify.cpp(38.22 KB)
📄 WebAssemblyRegisterInfo.cpp(6.21 KB)
📄 WebAssemblyRegisterInfo.h(1.74 KB)
📄 WebAssemblyRegisterInfo.td(2.83 KB)
📄 WebAssemblyReplacePhysRegs.cpp(3.89 KB)
📄 WebAssemblyRuntimeLibcallSignatures.cpp(33.82 KB)
📄 WebAssemblyRuntimeLibcallSignatures.h(1.37 KB)
📄 WebAssemblySelectionDAGInfo.cpp(2.57 KB)
📄 WebAssemblySelectionDAGInfo.h(1.94 KB)
📄 WebAssemblySetP2AlignOperands.cpp(3.32 KB)
📄 WebAssemblySubtarget.cpp(2.18 KB)
📄 WebAssemblySubtarget.h(3.88 KB)
📄 WebAssemblyTargetMachine.cpp(18.85 KB)
📄 WebAssemblyTargetMachine.h(2.29 KB)
📄 WebAssemblyTargetObjectFile.cpp(886 B)
📄 WebAssemblyTargetObjectFile.h(959 B)
📄 WebAssemblyTargetTransformInfo.cpp(2.9 KB)
📄 WebAssemblyTargetTransformInfo.h(2.5 KB)
📄 WebAssemblyUtilities.cpp(3.43 KB)
📄 WebAssemblyUtilities.h(1.8 KB)
📄 known_gcc_test_failures.txt(2.07 KB)

Editing: WebAssemblyUtilities.cpp

//===-- WebAssemblyUtilities.cpp - WebAssembly Utility Functions ----------===//
//
// 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 implements several utility functions for WebAssembly.
///
//===----------------------------------------------------------------------===//

#include "WebAssemblyUtilities.h"
#include "WebAssemblyMachineFunctionInfo.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
using namespace llvm;

const char *const WebAssembly::ClangCallTerminateFn = "__clang_call_terminate";
const char *const WebAssembly::CxaBeginCatchFn = "__cxa_begin_catch";
const char *const WebAssembly::CxaRethrowFn = "__cxa_rethrow";
const char *const WebAssembly::StdTerminateFn = "_ZSt9terminatev";
const char *const WebAssembly::PersonalityWrapperFn =
    "_Unwind_Wasm_CallPersonality";

/// Test whether MI is a child of some other node in an expression tree.
bool WebAssembly::isChild(const MachineInstr &MI,
                          const WebAssemblyFunctionInfo &MFI) {
  if (MI.getNumOperands() == 0)
    return false;
  const MachineOperand &MO = MI.getOperand(0);
  if (!MO.isReg() || MO.isImplicit() || !MO.isDef())
    return false;
  Register Reg = MO.getReg();
  return Register::isVirtualRegister(Reg) && MFI.isVRegStackified(Reg);
}

bool WebAssembly::mayThrow(const MachineInstr &MI) {
  switch (MI.getOpcode()) {
  case WebAssembly::THROW:
  case WebAssembly::THROW_S:
  case WebAssembly::RETHROW:
  case WebAssembly::RETHROW_S:
    return true;
  }
  if (isCallIndirect(MI.getOpcode()))
    return true;
  if (!MI.isCall())
    return false;

const MachineOperand &MO = getCalleeOp(MI);
  assert(MO.isGlobal() || MO.isSymbol());

if (MO.isSymbol()) {
    // Some intrinsics are lowered to calls to external symbols, which are then
    // lowered to calls to library functions. Most of libcalls don't throw, but
    // we only list some of them here now.
    // TODO Consider adding 'nounwind' info in TargetLowering::CallLoweringInfo
    // instead for more accurate info.
    const char *Name = MO.getSymbolName();
    if (strcmp(Name, "memcpy") == 0 || strcmp(Name, "memmove") == 0 ||
        strcmp(Name, "memset") == 0)
      return false;
    return true;
  }

const auto *F = dyn_cast<Function>(MO.getGlobal());
  if (!F)
    return true;
  if (F->doesNotThrow())
    return false;
  // These functions never throw
  if (F->getName() == CxaBeginCatchFn || F->getName() == PersonalityWrapperFn ||
      F->getName() == ClangCallTerminateFn || F->getName() == StdTerminateFn)
    return false;

// TODO Can we exclude call instructions that are marked as 'nounwind' in the
  // original LLVm IR? (Even when the callee may throw)
  return true;
}

const MachineOperand &WebAssembly::getCalleeOp(const MachineInstr &MI) {
  switch (MI.getOpcode()) {
  case WebAssembly::CALL:
  case WebAssembly::CALL_S:
  case WebAssembly::RET_CALL:
  case WebAssembly::RET_CALL_S:
    return MI.getOperand(MI.getNumExplicitDefs());
  case WebAssembly::CALL_INDIRECT:
  case WebAssembly::CALL_INDIRECT_S:
  case WebAssembly::RET_CALL_INDIRECT:
  case WebAssembly::RET_CALL_INDIRECT_S:
    return MI.getOperand(MI.getNumOperands() - 1);
  default:
    llvm_unreachable("Not a call instruction");
  }
}

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Editing: WebAssemblyUtilities.cpp

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