llvm/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp

//===-- WebAssemblyAsmPrinter.cpp - WebAssembly LLVM assembly writer ------===//
//
// 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 contains a printer that converts from our internal
/// representation of machine-dependent LLVM code to the WebAssembly assembly
/// language.
///
//===----------------------------------------------------------------------===//

#include "WebAssemblyAsmPrinter.h"
#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
#include "MCTargetDesc/WebAssemblyTargetStreamer.h"
#include "TargetInfo/WebAssemblyTargetInfo.h"
#include "Utils/WebAssemblyTypeUtilities.h"
#include "WebAssembly.h"
#include "WebAssemblyMCInstLower.h"
#include "WebAssemblyMachineFunctionInfo.h"
#include "WebAssemblyRegisterInfo.h"
#include "WebAssemblyRuntimeLibcallSignatures.h"
#include "WebAssemblyTargetMachine.h"
#include "WebAssemblyUtilities.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/BinaryFormat/Wasm.h"
#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSectionWasm.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCSymbolWasm.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"

usingnamespacellvm;

#define DEBUG_TYPE …

extern cl::opt<bool> WasmKeepRegisters;

//===----------------------------------------------------------------------===//
// Helpers.
//===----------------------------------------------------------------------===//

MVT WebAssemblyAsmPrinter::getRegType(unsigned RegNo) const { … }

std::string WebAssemblyAsmPrinter::regToString(const MachineOperand &MO) { … }

WebAssemblyTargetStreamer *WebAssemblyAsmPrinter::getTargetStreamer() { … }

// Emscripten exception handling helpers
//
// This converts invoke names generated by LowerEmscriptenEHSjLj to real names
// that are expected by JavaScript glue code. The invoke names generated by
// Emscripten JS glue code are based on their argument and return types; for
// example, for a function that takes an i32 and returns nothing, it is
// 'invoke_vi'. But the format of invoke generated by LowerEmscriptenEHSjLj pass
// contains a mangled string generated from their IR types, for example,
// "__invoke_void_%struct.mystruct*_int", because final wasm types are not
// available in the IR pass. So we convert those names to the form that
// Emscripten JS code expects.
//
// Refer to LowerEmscriptenEHSjLj pass for more details.

// Returns true if the given function name is an invoke name generated by
// LowerEmscriptenEHSjLj pass.
static bool isEmscriptenInvokeName(StringRef Name) { … }

// Returns a character that represents the given wasm value type in invoke
// signatures.
static char getInvokeSig(wasm::ValType VT) { … }

// Given the wasm signature, generate the invoke name in the format JS glue code
// expects.
static std::string getEmscriptenInvokeSymbolName(wasm::WasmSignature *Sig) { … }

//===----------------------------------------------------------------------===//
// WebAssemblyAsmPrinter Implementation.
//===----------------------------------------------------------------------===//

MCSymbolWasm *WebAssemblyAsmPrinter::getMCSymbolForFunction(
    const Function *F, bool EnableEmEH, wasm::WasmSignature *Sig,
    bool &InvokeDetected) { … }

void WebAssemblyAsmPrinter::emitGlobalVariable(const GlobalVariable *GV) { … }

MCSymbol *WebAssemblyAsmPrinter::getOrCreateWasmSymbol(StringRef Name) { … }

void WebAssemblyAsmPrinter::emitSymbolType(const MCSymbolWasm *Sym) { … }

void WebAssemblyAsmPrinter::emitDecls(const Module &M) { … }

void WebAssemblyAsmPrinter::emitEndOfAsmFile(Module &M) { … }

void WebAssemblyAsmPrinter::EmitProducerInfo(Module &M) { … }

void WebAssemblyAsmPrinter::EmitTargetFeatures(Module &M) { … }

void WebAssemblyAsmPrinter::EmitFunctionAttributes(Module &M) { … }

void WebAssemblyAsmPrinter::emitConstantPool() { … }

void WebAssemblyAsmPrinter::emitJumpTableInfo() { … }

void WebAssemblyAsmPrinter::emitFunctionBodyStart() { … }

void WebAssemblyAsmPrinter::emitInstruction(const MachineInstr *MI) { … }

bool WebAssemblyAsmPrinter::PrintAsmOperand(const MachineInstr *MI,
                                            unsigned OpNo,
                                            const char *ExtraCode,
                                            raw_ostream &OS) { … }

bool WebAssemblyAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
                                                  unsigned OpNo,
                                                  const char *ExtraCode,
                                                  raw_ostream &OS) { … }

// Force static initialization.
extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeWebAssemblyAsmPrinter() { … }