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eff95e4130
Soon it will be disallowed to depend on MachineFunction state in the constructor. This was only being used to get the MachineRegisterInfo for an assert, which I'm not sure is necessarily worth it. I would think any missing defs would be caught by the verifier later instead.
117 lines
4.3 KiB
C++
117 lines
4.3 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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#include "llvm/Target/TargetMachine.h"
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using namespace llvm;
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WebAssemblyFunctionInfo::~WebAssemblyFunctionInfo() = default; // anchor.
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void WebAssemblyFunctionInfo::initWARegs(MachineRegisterInfo &MRI) {
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assert(WARegs.empty());
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unsigned Reg = UnusedReg;
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WARegs.resize(MRI.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,
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const Function *TargetFunc,
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const Function &ContextFunc,
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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(ContextFunc, 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>(ContextFunc).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(ContextFunc, TM, Param, Params);
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if (Ty->isVarArg())
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Params.push_back(PtrVT);
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// For swiftcc, emit additional swiftself and swifterror parameters
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// if there aren't. These additional parameters are also passed for caller.
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// They are necessary to match callee and caller signature for indirect
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// call.
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if (TargetFunc && TargetFunc->getCallingConv() == CallingConv::Swift) {
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MVT PtrVT = MVT::getIntegerVT(TM.createDataLayout().getPointerSizeInBits());
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bool HasSwiftErrorArg = false;
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bool HasSwiftSelfArg = false;
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for (const auto &Arg : TargetFunc->args()) {
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HasSwiftErrorArg |= Arg.hasAttribute(Attribute::SwiftError);
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HasSwiftSelfArg |= Arg.hasAttribute(Attribute::SwiftSelf);
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}
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if (!HasSwiftErrorArg)
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Params.push_back(PtrVT);
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if (!HasSwiftSelfArg)
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Params.push_back(PtrVT);
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}
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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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