2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
349 lines
10 KiB
C++
349 lines
10 KiB
C++
//===-- WebAssemblyUtilities.cpp - WebAssembly Utility Functions ----------===//
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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 implements several utility functions for WebAssembly.
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///
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//===----------------------------------------------------------------------===//
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#include "WebAssemblyUtilities.h"
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#include "WebAssemblyMachineFunctionInfo.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineLoopInfo.h"
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using namespace llvm;
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const char *const WebAssembly::ClangCallTerminateFn = "__clang_call_terminate";
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const char *const WebAssembly::CxaBeginCatchFn = "__cxa_begin_catch";
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const char *const WebAssembly::CxaRethrowFn = "__cxa_rethrow";
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const char *const WebAssembly::StdTerminateFn = "_ZSt9terminatev";
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const char *const WebAssembly::PersonalityWrapperFn =
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"_Unwind_Wasm_CallPersonality";
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bool WebAssembly::isArgument(const MachineInstr &MI) {
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switch (MI.getOpcode()) {
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case WebAssembly::ARGUMENT_i32:
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case WebAssembly::ARGUMENT_i32_S:
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case WebAssembly::ARGUMENT_i64:
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case WebAssembly::ARGUMENT_i64_S:
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case WebAssembly::ARGUMENT_f32:
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case WebAssembly::ARGUMENT_f32_S:
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case WebAssembly::ARGUMENT_f64:
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case WebAssembly::ARGUMENT_f64_S:
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case WebAssembly::ARGUMENT_v16i8:
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case WebAssembly::ARGUMENT_v16i8_S:
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case WebAssembly::ARGUMENT_v8i16:
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case WebAssembly::ARGUMENT_v8i16_S:
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case WebAssembly::ARGUMENT_v4i32:
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case WebAssembly::ARGUMENT_v4i32_S:
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case WebAssembly::ARGUMENT_v2i64:
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case WebAssembly::ARGUMENT_v2i64_S:
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case WebAssembly::ARGUMENT_v4f32:
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case WebAssembly::ARGUMENT_v4f32_S:
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case WebAssembly::ARGUMENT_v2f64:
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case WebAssembly::ARGUMENT_v2f64_S:
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return true;
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default:
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return false;
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}
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}
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bool WebAssembly::isCopy(const MachineInstr &MI) {
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switch (MI.getOpcode()) {
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case WebAssembly::COPY_I32:
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case WebAssembly::COPY_I32_S:
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case WebAssembly::COPY_I64:
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case WebAssembly::COPY_I64_S:
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case WebAssembly::COPY_F32:
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case WebAssembly::COPY_F32_S:
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case WebAssembly::COPY_F64:
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case WebAssembly::COPY_F64_S:
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case WebAssembly::COPY_V128:
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case WebAssembly::COPY_V128_S:
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return true;
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default:
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return false;
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}
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}
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bool WebAssembly::isTee(const MachineInstr &MI) {
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switch (MI.getOpcode()) {
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case WebAssembly::TEE_I32:
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case WebAssembly::TEE_I32_S:
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case WebAssembly::TEE_I64:
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case WebAssembly::TEE_I64_S:
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case WebAssembly::TEE_F32:
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case WebAssembly::TEE_F32_S:
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case WebAssembly::TEE_F64:
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case WebAssembly::TEE_F64_S:
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case WebAssembly::TEE_V128:
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case WebAssembly::TEE_V128_S:
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return true;
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default:
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return false;
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}
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}
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/// Test whether MI is a child of some other node in an expression tree.
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bool WebAssembly::isChild(const MachineInstr &MI,
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const WebAssemblyFunctionInfo &MFI) {
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if (MI.getNumOperands() == 0)
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return false;
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const MachineOperand &MO = MI.getOperand(0);
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if (!MO.isReg() || MO.isImplicit() || !MO.isDef())
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return false;
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unsigned Reg = MO.getReg();
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return TargetRegisterInfo::isVirtualRegister(Reg) &&
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MFI.isVRegStackified(Reg);
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}
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bool WebAssembly::isCallDirect(const MachineInstr &MI) {
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switch (MI.getOpcode()) {
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case WebAssembly::CALL_VOID:
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case WebAssembly::CALL_VOID_S:
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case WebAssembly::CALL_I32:
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case WebAssembly::CALL_I32_S:
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case WebAssembly::CALL_I64:
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case WebAssembly::CALL_I64_S:
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case WebAssembly::CALL_F32:
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case WebAssembly::CALL_F32_S:
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case WebAssembly::CALL_F64:
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case WebAssembly::CALL_F64_S:
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case WebAssembly::CALL_v16i8:
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case WebAssembly::CALL_v16i8_S:
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case WebAssembly::CALL_v8i16:
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case WebAssembly::CALL_v8i16_S:
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case WebAssembly::CALL_v4i32:
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case WebAssembly::CALL_v4i32_S:
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case WebAssembly::CALL_v2i64:
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case WebAssembly::CALL_v2i64_S:
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case WebAssembly::CALL_v4f32:
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case WebAssembly::CALL_v4f32_S:
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case WebAssembly::CALL_v2f64:
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case WebAssembly::CALL_v2f64_S:
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case WebAssembly::CALL_EXCEPT_REF:
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case WebAssembly::CALL_EXCEPT_REF_S:
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return true;
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default:
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return false;
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}
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}
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bool WebAssembly::isCallIndirect(const MachineInstr &MI) {
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switch (MI.getOpcode()) {
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case WebAssembly::CALL_INDIRECT_VOID:
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case WebAssembly::CALL_INDIRECT_VOID_S:
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case WebAssembly::CALL_INDIRECT_I32:
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case WebAssembly::CALL_INDIRECT_I32_S:
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case WebAssembly::CALL_INDIRECT_I64:
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case WebAssembly::CALL_INDIRECT_I64_S:
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case WebAssembly::CALL_INDIRECT_F32:
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case WebAssembly::CALL_INDIRECT_F32_S:
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case WebAssembly::CALL_INDIRECT_F64:
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case WebAssembly::CALL_INDIRECT_F64_S:
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case WebAssembly::CALL_INDIRECT_v16i8:
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case WebAssembly::CALL_INDIRECT_v16i8_S:
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case WebAssembly::CALL_INDIRECT_v8i16:
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case WebAssembly::CALL_INDIRECT_v8i16_S:
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case WebAssembly::CALL_INDIRECT_v4i32:
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case WebAssembly::CALL_INDIRECT_v4i32_S:
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case WebAssembly::CALL_INDIRECT_v2i64:
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case WebAssembly::CALL_INDIRECT_v2i64_S:
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case WebAssembly::CALL_INDIRECT_v4f32:
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case WebAssembly::CALL_INDIRECT_v4f32_S:
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case WebAssembly::CALL_INDIRECT_v2f64:
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case WebAssembly::CALL_INDIRECT_v2f64_S:
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case WebAssembly::CALL_INDIRECT_EXCEPT_REF:
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case WebAssembly::CALL_INDIRECT_EXCEPT_REF_S:
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return true;
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default:
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return false;
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}
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}
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unsigned WebAssembly::getCalleeOpNo(const MachineInstr &MI) {
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switch (MI.getOpcode()) {
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case WebAssembly::CALL_VOID:
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case WebAssembly::CALL_VOID_S:
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case WebAssembly::CALL_INDIRECT_VOID:
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case WebAssembly::CALL_INDIRECT_VOID_S:
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return 0;
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case WebAssembly::CALL_I32:
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case WebAssembly::CALL_I32_S:
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case WebAssembly::CALL_I64:
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case WebAssembly::CALL_I64_S:
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case WebAssembly::CALL_F32:
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case WebAssembly::CALL_F32_S:
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case WebAssembly::CALL_F64:
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case WebAssembly::CALL_F64_S:
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case WebAssembly::CALL_v16i8:
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case WebAssembly::CALL_v16i8_S:
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case WebAssembly::CALL_v8i16:
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case WebAssembly::CALL_v8i16_S:
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case WebAssembly::CALL_v4i32:
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case WebAssembly::CALL_v4i32_S:
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case WebAssembly::CALL_v2i64:
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case WebAssembly::CALL_v2i64_S:
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case WebAssembly::CALL_v4f32:
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case WebAssembly::CALL_v4f32_S:
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case WebAssembly::CALL_v2f64:
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case WebAssembly::CALL_v2f64_S:
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case WebAssembly::CALL_EXCEPT_REF:
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case WebAssembly::CALL_EXCEPT_REF_S:
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case WebAssembly::CALL_INDIRECT_I32:
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case WebAssembly::CALL_INDIRECT_I32_S:
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case WebAssembly::CALL_INDIRECT_I64:
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case WebAssembly::CALL_INDIRECT_I64_S:
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case WebAssembly::CALL_INDIRECT_F32:
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case WebAssembly::CALL_INDIRECT_F32_S:
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case WebAssembly::CALL_INDIRECT_F64:
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case WebAssembly::CALL_INDIRECT_F64_S:
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case WebAssembly::CALL_INDIRECT_v16i8:
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case WebAssembly::CALL_INDIRECT_v16i8_S:
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case WebAssembly::CALL_INDIRECT_v8i16:
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case WebAssembly::CALL_INDIRECT_v8i16_S:
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case WebAssembly::CALL_INDIRECT_v4i32:
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case WebAssembly::CALL_INDIRECT_v4i32_S:
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case WebAssembly::CALL_INDIRECT_v2i64:
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case WebAssembly::CALL_INDIRECT_v2i64_S:
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case WebAssembly::CALL_INDIRECT_v4f32:
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case WebAssembly::CALL_INDIRECT_v4f32_S:
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case WebAssembly::CALL_INDIRECT_v2f64:
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case WebAssembly::CALL_INDIRECT_v2f64_S:
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case WebAssembly::CALL_INDIRECT_EXCEPT_REF:
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case WebAssembly::CALL_INDIRECT_EXCEPT_REF_S:
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return 1;
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default:
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llvm_unreachable("Not a call instruction");
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}
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}
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bool WebAssembly::isMarker(const MachineInstr &MI) {
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switch (MI.getOpcode()) {
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case WebAssembly::BLOCK:
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case WebAssembly::BLOCK_S:
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case WebAssembly::END_BLOCK:
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case WebAssembly::END_BLOCK_S:
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case WebAssembly::LOOP:
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case WebAssembly::LOOP_S:
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case WebAssembly::END_LOOP:
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case WebAssembly::END_LOOP_S:
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case WebAssembly::TRY:
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case WebAssembly::TRY_S:
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case WebAssembly::END_TRY:
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case WebAssembly::END_TRY_S:
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return true;
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default:
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return false;
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}
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}
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bool WebAssembly::isThrow(const MachineInstr &MI) {
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switch (MI.getOpcode()) {
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case WebAssembly::THROW_I32:
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case WebAssembly::THROW_I32_S:
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case WebAssembly::THROW_I64:
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case WebAssembly::THROW_I64_S:
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return true;
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default:
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return false;
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}
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}
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bool WebAssembly::isRethrow(const MachineInstr &MI) {
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switch (MI.getOpcode()) {
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case WebAssembly::RETHROW:
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case WebAssembly::RETHROW_S:
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case WebAssembly::RETHROW_TO_CALLER:
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case WebAssembly::RETHROW_TO_CALLER_S:
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return true;
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default:
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return false;
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}
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}
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bool WebAssembly::isCatch(const MachineInstr &MI) {
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switch (MI.getOpcode()) {
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case WebAssembly::CATCH_I32:
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case WebAssembly::CATCH_I32_S:
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case WebAssembly::CATCH_I64:
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case WebAssembly::CATCH_I64_S:
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case WebAssembly::CATCH_ALL:
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case WebAssembly::CATCH_ALL_S:
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return true;
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default:
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return false;
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}
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}
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bool WebAssembly::mayThrow(const MachineInstr &MI) {
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switch (MI.getOpcode()) {
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case WebAssembly::THROW_I32:
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case WebAssembly::THROW_I32_S:
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case WebAssembly::THROW_I64:
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case WebAssembly::THROW_I64_S:
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case WebAssembly::RETHROW:
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case WebAssembly::RETHROW_S:
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return true;
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}
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if (isCallIndirect(MI))
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return true;
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if (!MI.isCall())
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return false;
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const MachineOperand &MO = MI.getOperand(getCalleeOpNo(MI));
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assert(MO.isGlobal());
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const auto *F = dyn_cast<Function>(MO.getGlobal());
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if (!F)
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return true;
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if (F->doesNotThrow())
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return false;
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// These functions never throw
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if (F->getName() == CxaBeginCatchFn || F->getName() == PersonalityWrapperFn ||
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F->getName() == ClangCallTerminateFn || F->getName() == StdTerminateFn)
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return false;
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return true;
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}
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bool WebAssembly::isCatchTerminatePad(const MachineBasicBlock &MBB) {
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if (!MBB.isEHPad())
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return false;
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bool SeenCatch = false;
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for (auto &MI : MBB) {
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if (MI.getOpcode() == WebAssembly::CATCH_I32 ||
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MI.getOpcode() == WebAssembly::CATCH_I64 ||
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MI.getOpcode() == WebAssembly::CATCH_I32_S ||
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MI.getOpcode() == WebAssembly::CATCH_I64_S)
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SeenCatch = true;
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if (SeenCatch && MI.isCall()) {
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const MachineOperand &CalleeOp = MI.getOperand(getCalleeOpNo(MI));
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if (CalleeOp.isGlobal() &&
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CalleeOp.getGlobal()->getName() == ClangCallTerminateFn)
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return true;
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}
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}
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return false;
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}
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bool WebAssembly::isCatchAllTerminatePad(const MachineBasicBlock &MBB) {
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if (!MBB.isEHPad())
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return false;
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bool SeenCatchAll = false;
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for (auto &MI : MBB) {
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if (MI.getOpcode() == WebAssembly::CATCH_ALL ||
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MI.getOpcode() == WebAssembly::CATCH_ALL_S)
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SeenCatchAll = true;
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if (SeenCatchAll && MI.isCall()) {
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const MachineOperand &CalleeOp = MI.getOperand(getCalleeOpNo(MI));
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if (CalleeOp.isGlobal() &&
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CalleeOp.getGlobal()->getName() == StdTerminateFn)
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return true;
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}
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}
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return false;
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}
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