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//=- WebAssemblyMachineFunctionInfo.cpp - WebAssembly Machine Function Info -=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \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() {}
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);
}
std::unique_ptr<wasm::WasmSignature>
llvm::SignatureFromMVTs(const SmallVectorImpl<MVT> &Results,
const SmallVectorImpl<MVT> &Params) {
auto Sig = make_unique<wasm::WasmSignature>();
for (MVT Ty : Results)
Sig->Returns.push_back(WebAssembly::toValType(Ty));
for (MVT Ty : Params)
Sig->Params.push_back(WebAssembly::toValType(Ty));
return Sig;
}
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