blob: e511e574050fc233e91e575f3e9606b08e28a225 [file] [log] [blame]
//=- 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 Function &F, const TargetMachine &TM,
SmallVectorImpl<MVT> &Params,
SmallVectorImpl<MVT> &Results) {
ComputeLegalValueVTs(F, TM, F.getReturnType(), Results);
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(
MVT::getIntegerVT(TM.createDataLayout().getPointerSizeInBits()));
}
for (auto &Arg : F.args())
ComputeLegalValueVTs(F, TM, Arg.getType(), Params);
}