llvm/llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp

// CodeGen/RuntimeLibcallSignatures.cpp - R.T. Lib. Call Signatures -*- C++ -*--
//
// 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 signature information for runtime libcalls.
///
/// CodeGen uses external symbols, which it refers to by name. The WebAssembly
/// target needs type information for all functions. This file contains a big
/// table providing type signatures for all runtime library functions that LLVM
/// uses.
///
/// This is currently a fairly heavy-handed solution.
///
//===----------------------------------------------------------------------===//

#include "WebAssemblyRuntimeLibcallSignatures.h"
#include "WebAssemblySubtarget.h"
#include "WebAssemblyUtilities.h"
#include "llvm/CodeGen/RuntimeLibcallUtil.h"

usingnamespacellvm;

namespace {

enum RuntimeLibcallSignature { … };

struct RuntimeLibcallSignatureTable { … };

RuntimeLibcallSignatureTable &getRuntimeLibcallSignatures() { … }

// Maps libcall names to their RTLIB::Libcall number. Builds the map in a
// constructor for use with a static variable
struct StaticLibcallNameMap { … };

} // end anonymous namespace

void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
                                      RTLIB::Libcall LC,
                                      SmallVectorImpl<wasm::ValType> &Rets,
                                      SmallVectorImpl<wasm::ValType> &Params) { … }

// TODO: If the RTLIB::Libcall-taking flavor of GetSignature remains unused
// other than here, just roll its logic into this version.
void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
                                      StringRef Name,
                                      SmallVectorImpl<wasm::ValType> &Rets,
                                      SmallVectorImpl<wasm::ValType> &Params) { … }