77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
//=- WebAssemblyMachineFunctionInfo.cpp - WebAssembly Machine Function Info -=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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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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for (MVT Ty : Results)
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Sig->Returns.push_back(WebAssembly::toValType(Ty));
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for (MVT Ty : Params)
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Sig->Params.push_back(WebAssembly::toValType(Ty));
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return Sig;
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}
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