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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
80 lines
2.8 KiB
C++
80 lines
2.8 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() {}
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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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// WebAssembly currently can't lower returns of multiple values without
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// demoting to sret (see WebAssemblyTargetLowering::CanLowerReturn). So
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// replace multiple return values with a pointer 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 = 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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