forked from OSchip/llvm-project
286 lines
10 KiB
C++
286 lines
10 KiB
C++
//===-- WebAssemblyAsmPrinter.cpp - WebAssembly LLVM assembly writer ------===//
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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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/// \brief This file contains a printer that converts from our internal
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/// representation of machine-dependent LLVM code to the WebAssembly assembly
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/// language.
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///
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//===----------------------------------------------------------------------===//
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#include "WebAssembly.h"
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#include "InstPrinter/WebAssemblyInstPrinter.h"
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#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
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#include "WebAssemblyMCInstLower.h"
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#include "WebAssemblyMachineFunctionInfo.h"
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#include "WebAssemblyRegisterInfo.h"
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#include "WebAssemblySubtarget.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/CodeGen/Analysis.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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#define DEBUG_TYPE "asm-printer"
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namespace {
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class WebAssemblyAsmPrinter final : public AsmPrinter {
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const MachineRegisterInfo *MRI;
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const WebAssemblyFunctionInfo *MFI;
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public:
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WebAssemblyAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
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: AsmPrinter(TM, std::move(Streamer)), MRI(nullptr), MFI(nullptr) {}
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private:
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const char *getPassName() const override {
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return "WebAssembly Assembly Printer";
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}
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//===------------------------------------------------------------------===//
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// MachineFunctionPass Implementation.
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//===------------------------------------------------------------------===//
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bool runOnMachineFunction(MachineFunction &MF) override {
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MRI = &MF.getRegInfo();
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MFI = MF.getInfo<WebAssemblyFunctionInfo>();
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return AsmPrinter::runOnMachineFunction(MF);
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}
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//===------------------------------------------------------------------===//
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// AsmPrinter Implementation.
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//===------------------------------------------------------------------===//
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void EmitJumpTableInfo() override;
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void EmitConstantPool() override;
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void EmitFunctionBodyStart() override;
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void EmitInstruction(const MachineInstr *MI) override;
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bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &OS) override;
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bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &OS) override;
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MVT getRegType(unsigned RegNo) const;
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const char *toString(MVT VT) const;
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std::string regToString(const MachineOperand &MO);
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};
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} // end anonymous namespace
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//===----------------------------------------------------------------------===//
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// Helpers.
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//===----------------------------------------------------------------------===//
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MVT WebAssemblyAsmPrinter::getRegType(unsigned RegNo) const {
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const TargetRegisterClass *TRC =
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TargetRegisterInfo::isVirtualRegister(RegNo) ?
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MRI->getRegClass(RegNo) :
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MRI->getTargetRegisterInfo()->getMinimalPhysRegClass(RegNo);
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for (MVT T : {MVT::i32, MVT::i64, MVT::f32, MVT::f64})
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if (TRC->hasType(T))
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return T;
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DEBUG(errs() << "Unknown type for register number: " << RegNo);
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llvm_unreachable("Unknown register type");
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return MVT::Other;
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}
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std::string WebAssemblyAsmPrinter::regToString(const MachineOperand &MO) {
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unsigned RegNo = MO.getReg();
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assert(TargetRegisterInfo::isVirtualRegister(RegNo) &&
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"Unlowered physical register encountered during assembly printing");
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assert(!MFI->isVRegStackified(RegNo));
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unsigned WAReg = MFI->getWAReg(RegNo);
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assert(WAReg != WebAssemblyFunctionInfo::UnusedReg);
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return '$' + utostr(WAReg);
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}
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const char *WebAssemblyAsmPrinter::toString(MVT VT) const {
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return WebAssembly::TypeToString(VT);
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}
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//===----------------------------------------------------------------------===//
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// WebAssemblyAsmPrinter Implementation.
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//===----------------------------------------------------------------------===//
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void WebAssemblyAsmPrinter::EmitConstantPool() {
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assert(MF->getConstantPool()->getConstants().empty() &&
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"WebAssembly disables constant pools");
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}
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void WebAssemblyAsmPrinter::EmitJumpTableInfo() {
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// Nothing to do; jump tables are incorporated into the instruction stream.
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}
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static void 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 WebAssemblyAsmPrinter::EmitFunctionBodyStart() {
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if (!MFI->getParams().empty()) {
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MCInst Param;
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Param.setOpcode(WebAssembly::PARAM);
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for (MVT VT : MFI->getParams())
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Param.addOperand(MCOperand::createImm(VT.SimpleTy));
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EmitToStreamer(*OutStreamer, Param);
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}
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SmallVector<MVT, 4> ResultVTs;
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const Function &F(*MF->getFunction());
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ComputeLegalValueVTs(F, TM, F.getReturnType(), ResultVTs);
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// If the return type needs to be legalized it will get converted into
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// passing a pointer.
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if (ResultVTs.size() == 1) {
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MCInst Result;
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Result.setOpcode(WebAssembly::RESULT);
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Result.addOperand(MCOperand::createImm(ResultVTs.front().SimpleTy));
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EmitToStreamer(*OutStreamer, Result);
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}
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bool AnyWARegs = false;
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MCInst Local;
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Local.setOpcode(WebAssembly::LOCAL);
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for (unsigned Idx = 0, IdxE = MRI->getNumVirtRegs(); Idx != IdxE; ++Idx) {
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unsigned VReg = TargetRegisterInfo::index2VirtReg(Idx);
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unsigned WAReg = MFI->getWAReg(VReg);
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// Don't declare unused registers.
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if (WAReg == WebAssemblyFunctionInfo::UnusedReg)
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continue;
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// Don't redeclare parameters.
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if (WAReg < MFI->getParams().size())
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continue;
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// Don't declare stackified registers.
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if (int(WAReg) < 0)
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continue;
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Local.addOperand(MCOperand::createImm(getRegType(VReg).SimpleTy));
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AnyWARegs = true;
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}
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auto &PhysRegs = MFI->getPhysRegs();
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for (unsigned PReg = 0; PReg < PhysRegs.size(); ++PReg) {
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if (PhysRegs[PReg] == -1U)
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continue;
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Local.addOperand(MCOperand::createImm(getRegType(PReg).SimpleTy));
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AnyWARegs = true;
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}
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if (AnyWARegs)
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EmitToStreamer(*OutStreamer, Local);
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AsmPrinter::EmitFunctionBodyStart();
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}
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void WebAssemblyAsmPrinter::EmitInstruction(const MachineInstr *MI) {
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DEBUG(dbgs() << "EmitInstruction: " << *MI << '\n');
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switch (MI->getOpcode()) {
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case WebAssembly::ARGUMENT_I32:
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case WebAssembly::ARGUMENT_I64:
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case WebAssembly::ARGUMENT_F32:
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case WebAssembly::ARGUMENT_F64:
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// These represent values which are live into the function entry, so there's
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// no instruction to emit.
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break;
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case WebAssembly::LOOP_END:
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// This is a no-op which just exists to tell AsmPrinter.cpp that there's a
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// fallthrough which nevertheless requires a label for the destination here.
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break;
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default: {
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WebAssemblyMCInstLower MCInstLowering(OutContext, *this);
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MCInst TmpInst;
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MCInstLowering.Lower(MI, TmpInst);
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EmitToStreamer(*OutStreamer, TmpInst);
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break;
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}
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}
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}
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bool WebAssemblyAsmPrinter::PrintAsmOperand(const MachineInstr *MI,
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unsigned OpNo, unsigned AsmVariant,
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const char *ExtraCode,
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raw_ostream &OS) {
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if (AsmVariant != 0)
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report_fatal_error("There are no defined alternate asm variants");
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// First try the generic code, which knows about modifiers like 'c' and 'n'.
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if (!AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, OS))
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return false;
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if (!ExtraCode) {
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const MachineOperand &MO = MI->getOperand(OpNo);
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switch (MO.getType()) {
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case MachineOperand::MO_Immediate:
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OS << MO.getImm();
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return false;
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case MachineOperand::MO_Register:
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OS << regToString(MO);
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return false;
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case MachineOperand::MO_GlobalAddress:
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getSymbol(MO.getGlobal())->print(OS, MAI);
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printOffset(MO.getOffset(), OS);
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return false;
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case MachineOperand::MO_ExternalSymbol:
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GetExternalSymbolSymbol(MO.getSymbolName())->print(OS, MAI);
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printOffset(MO.getOffset(), OS);
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return false;
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case MachineOperand::MO_MachineBasicBlock:
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MO.getMBB()->getSymbol()->print(OS, MAI);
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return false;
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default:
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break;
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}
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}
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return true;
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}
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bool WebAssemblyAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
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unsigned OpNo,
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unsigned AsmVariant,
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const char *ExtraCode,
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raw_ostream &OS) {
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if (AsmVariant != 0)
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report_fatal_error("There are no defined alternate asm variants");
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if (!ExtraCode) {
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// TODO: For now, we just hard-code 0 as the constant offset; teach
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// SelectInlineAsmMemoryOperand how to do address mode matching.
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OS << "0(" + regToString(MI->getOperand(OpNo)) + ')';
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return false;
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}
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return AsmPrinter::PrintAsmMemoryOperand(MI, OpNo, AsmVariant, ExtraCode, OS);
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}
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// Force static initialization.
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extern "C" void LLVMInitializeWebAssemblyAsmPrinter() {
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RegisterAsmPrinter<WebAssemblyAsmPrinter> X(TheWebAssemblyTarget32);
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RegisterAsmPrinter<WebAssemblyAsmPrinter> Y(TheWebAssemblyTarget64);
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}
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