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44cde01a89
Summary: This is necessary and sufficient to get simple cases of multiple return working with multivalue enabled. More complex cases will require block and loop signatures to be generalized to potentially be type indices as well. Reviewers: aheejin, dschuff Subscribers: sbc100, jgravelle-google, hiraditya, sunfish, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D68684 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@374235 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
3.4 KiB
C++
95 lines
3.4 KiB
C++
//=- WebAssemblyMachineFunctionInfo.cpp - WebAssembly Machine Function Info -=//
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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 WebAssembly-specific per-machine-function
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/// information.
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///
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//===----------------------------------------------------------------------===//
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#include "WebAssemblyMachineFunctionInfo.h"
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#include "WebAssemblyISelLowering.h"
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#include "WebAssemblySubtarget.h"
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#include "llvm/CodeGen/Analysis.h"
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using namespace llvm;
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WebAssemblyFunctionInfo::~WebAssemblyFunctionInfo() = default; // anchor.
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void WebAssemblyFunctionInfo::initWARegs() {
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assert(WARegs.empty());
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unsigned Reg = UnusedReg;
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WARegs.resize(MF.getRegInfo().getNumVirtRegs(), Reg);
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}
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void llvm::computeLegalValueVTs(const Function &F, const TargetMachine &TM,
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Type *Ty, SmallVectorImpl<MVT> &ValueVTs) {
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const DataLayout &DL(F.getParent()->getDataLayout());
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const WebAssemblyTargetLowering &TLI =
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*TM.getSubtarget<WebAssemblySubtarget>(F).getTargetLowering();
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SmallVector<EVT, 4> VTs;
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ComputeValueVTs(TLI, DL, Ty, VTs);
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for (EVT VT : VTs) {
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unsigned NumRegs = TLI.getNumRegisters(F.getContext(), VT);
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MVT RegisterVT = TLI.getRegisterType(F.getContext(), VT);
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for (unsigned I = 0; I != NumRegs; ++I)
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ValueVTs.push_back(RegisterVT);
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}
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}
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void llvm::computeSignatureVTs(const FunctionType *Ty, const Function &F,
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const TargetMachine &TM,
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SmallVectorImpl<MVT> &Params,
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SmallVectorImpl<MVT> &Results) {
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computeLegalValueVTs(F, TM, Ty->getReturnType(), Results);
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MVT PtrVT = MVT::getIntegerVT(TM.createDataLayout().getPointerSizeInBits());
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if (Results.size() > 1 &&
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!TM.getSubtarget<WebAssemblySubtarget>(F).hasMultivalue()) {
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// WebAssembly can't lower returns of multiple values without demoting to
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// sret unless multivalue is enabled (see
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// WebAssemblyTargetLowering::CanLowerReturn). So replace multiple return
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// values with a poitner parameter.
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Results.clear();
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Params.push_back(PtrVT);
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}
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for (auto *Param : Ty->params())
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computeLegalValueVTs(F, TM, Param, Params);
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if (Ty->isVarArg())
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Params.push_back(PtrVT);
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}
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void llvm::valTypesFromMVTs(const ArrayRef<MVT> &In,
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SmallVectorImpl<wasm::ValType> &Out) {
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for (MVT Ty : In)
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Out.push_back(WebAssembly::toValType(Ty));
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}
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std::unique_ptr<wasm::WasmSignature>
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llvm::signatureFromMVTs(const SmallVectorImpl<MVT> &Results,
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const SmallVectorImpl<MVT> &Params) {
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auto Sig = std::make_unique<wasm::WasmSignature>();
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valTypesFromMVTs(Results, Sig->Returns);
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valTypesFromMVTs(Params, Sig->Params);
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return Sig;
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}
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yaml::WebAssemblyFunctionInfo::WebAssemblyFunctionInfo(
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const llvm::WebAssemblyFunctionInfo &MFI)
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: CFGStackified(MFI.isCFGStackified()) {}
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void yaml::WebAssemblyFunctionInfo::mappingImpl(yaml::IO &YamlIO) {
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MappingTraits<WebAssemblyFunctionInfo>::mapping(YamlIO, *this);
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}
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void WebAssemblyFunctionInfo::initializeBaseYamlFields(
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const yaml::WebAssemblyFunctionInfo &YamlMFI) {
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CFGStackified = YamlMFI.CFGStackified;
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}
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