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//=- WebAssemblyMachineFunctionInfo.cpp - WebAssembly Machine Function Info -=//
//
// 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 WebAssembly-specific per-machine-function
/// information.
///
//===----------------------------------------------------------------------===//
#include "WebAssemblyMachineFunctionInfo.h"
#include "WebAssemblyISelLowering.h"
#include "WebAssemblySubtarget.h"
#include "llvm/CodeGen/Analysis.h"
using namespace llvm;
WebAssemblyFunctionInfo::~WebAssemblyFunctionInfo() = default; // anchor.
void WebAssemblyFunctionInfo::initWARegs() {
assert(WARegs.empty());
unsigned Reg = UnusedReg;
WARegs.resize(MF.getRegInfo().getNumVirtRegs(), Reg);
}
void llvm::computeLegalValueVTs(const Function &F, const TargetMachine &TM,
Type *Ty, SmallVectorImpl<MVT> &ValueVTs) {
const DataLayout &DL(F.getParent()->getDataLayout());
const WebAssemblyTargetLowering &TLI =
*TM.getSubtarget<WebAssemblySubtarget>(F).getTargetLowering();
SmallVector<EVT, 4> VTs;
ComputeValueVTs(TLI, DL, Ty, VTs);
for (EVT VT : VTs) {
unsigned NumRegs = TLI.getNumRegisters(F.getContext(), VT);
MVT RegisterVT = TLI.getRegisterType(F.getContext(), VT);
for (unsigned I = 0; I != NumRegs; ++I)
ValueVTs.push_back(RegisterVT);
}
}
void llvm::computeSignatureVTs(const FunctionType *Ty, const Function &F,
const TargetMachine &TM,
SmallVectorImpl<MVT> &Params,
SmallVectorImpl<MVT> &Results) {
computeLegalValueVTs(F, TM, Ty->getReturnType(), Results);
MVT PtrVT = MVT::getIntegerVT(TM.createDataLayout().getPointerSizeInBits());
if (Results.size() > 1) {
// WebAssembly currently can't lower returns of multiple values without
// demoting to sret (see WebAssemblyTargetLowering::CanLowerReturn). So
// replace multiple return values with a pointer parameter.
Results.clear();
Params.push_back(PtrVT);
}
for (auto *Param : Ty->params())
computeLegalValueVTs(F, TM, Param, Params);
if (Ty->isVarArg())
Params.push_back(PtrVT);
}
void llvm::valTypesFromMVTs(const ArrayRef<MVT> &In,
SmallVectorImpl<wasm::ValType> &Out) {
for (MVT Ty : In)
Out.push_back(WebAssembly::toValType(Ty));
}
std::unique_ptr<wasm::WasmSignature>
llvm::signatureFromMVTs(const SmallVectorImpl<MVT> &Results,
const SmallVectorImpl<MVT> &Params) {
auto Sig = std::make_unique<wasm::WasmSignature>();
valTypesFromMVTs(Results, Sig->Returns);
valTypesFromMVTs(Params, Sig->Params);
return Sig;
}
yaml::WebAssemblyFunctionInfo::WebAssemblyFunctionInfo(
const llvm::WebAssemblyFunctionInfo &MFI)
: CFGStackified(MFI.isCFGStackified()) {}
void yaml::WebAssemblyFunctionInfo::mappingImpl(yaml::IO &YamlIO) {
MappingTraits<WebAssemblyFunctionInfo>::mapping(YamlIO, *this);
}
void WebAssemblyFunctionInfo::initializeBaseYamlFields(
const yaml::WebAssemblyFunctionInfo &YamlMFI) {
CFGStackified = YamlMFI.CFGStackified;
}
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