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//===-- 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 "WebAssemblyAsmPrinter.h"
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#include "InstPrinter/WebAssemblyInstPrinter.h"
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#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
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#include "MCTargetDesc/WebAssemblyTargetStreamer.h"
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#include "WebAssembly.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 "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/CodeGen/MachineModuleInfoImpls.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/GlobalVariable.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/MC/MCSymbolWasm.h"
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#include "llvm/MC/MCSymbolELF.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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//===----------------------------------------------------------------------===//
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// Helpers.
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//===----------------------------------------------------------------------===//
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MVT WebAssemblyAsmPrinter::getRegType(unsigned RegNo) const {
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const TargetRegisterInfo *TRI = Subtarget->getRegisterInfo();
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const TargetRegisterClass *TRC = MRI->getRegClass(RegNo);
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for (MVT T : {MVT::i32, MVT::i64, MVT::f32, MVT::f64, MVT::v16i8, MVT::v8i16,
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MVT::v4i32, MVT::v4f32})
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if (TRI->isTypeLegalForClass(*TRC, 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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WebAssemblyTargetStreamer *WebAssemblyAsmPrinter::getTargetStreamer() {
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MCTargetStreamer *TS = OutStreamer->getTargetStreamer();
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return static_cast<WebAssemblyTargetStreamer *>(TS);
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}
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//===----------------------------------------------------------------------===//
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// WebAssemblyAsmPrinter Implementation.
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//===----------------------------------------------------------------------===//
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void WebAssemblyAsmPrinter::EmitEndOfAsmFile(Module &M) {
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for (const auto &F : M) {
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// Emit function type info for all undefined functions
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if (F.isDeclarationForLinker() && !F.isIntrinsic()) {
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SmallVector<MVT, 4> Results;
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SmallVector<MVT, 4> Params;
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ComputeSignatureVTs(F, TM, Params, Results);
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getTargetStreamer()->emitIndirectFunctionType(getSymbol(&F), Params,
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Results);
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}
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}
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for (const auto &G : M.globals()) {
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if (!G.hasInitializer() && G.hasExternalLinkage()) {
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if (G.getValueType()->isSized()) {
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uint16_t Size = M.getDataLayout().getTypeAllocSize(G.getValueType());
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if (TM.getTargetTriple().isOSBinFormatELF())
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getTargetStreamer()->emitGlobalImport(G.getGlobalIdentifier());
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OutStreamer->emitELFSize(getSymbol(&G),
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MCConstantExpr::create(Size, OutContext));
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}
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}
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}
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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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void WebAssemblyAsmPrinter::EmitFunctionBodyStart() {
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getTargetStreamer()->emitParam(CurrentFnSym, MFI->getParams());
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SmallVector<MVT, 4> ResultVTs;
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const Function &F = MF->getFunction();
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// Emit the function index.
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if (MDNode *Idx = F.getMetadata("wasm.index")) {
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assert(Idx->getNumOperands() == 1);
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getTargetStreamer()->emitIndIdx(AsmPrinter::lowerConstant(
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cast<ConstantAsMetadata>(Idx->getOperand(0))->getValue()));
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}
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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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getTargetStreamer()->emitResult(CurrentFnSym, ResultVTs);
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else
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getTargetStreamer()->emitResult(CurrentFnSym, ArrayRef<MVT>());
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if (TM.getTargetTriple().isOSBinFormatELF()) {
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assert(MFI->getLocals().empty());
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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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MFI->addLocal(getRegType(VReg));
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}
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}
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getTargetStreamer()->emitLocal(MFI->getLocals());
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AsmPrinter::EmitFunctionBodyStart();
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}
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void WebAssemblyAsmPrinter::EmitFunctionBodyEnd() {
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if (TM.getTargetTriple().isOSBinFormatELF())
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getTargetStreamer()->emitEndFunc();
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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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case WebAssembly::ARGUMENT_v16i8:
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case WebAssembly::ARGUMENT_v8i16:
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case WebAssembly::ARGUMENT_v4i32:
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case WebAssembly::ARGUMENT_v4f32:
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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::FALLTHROUGH_RETURN_I32:
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case WebAssembly::FALLTHROUGH_RETURN_I64:
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case WebAssembly::FALLTHROUGH_RETURN_F32:
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case WebAssembly::FALLTHROUGH_RETURN_F64:
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case WebAssembly::FALLTHROUGH_RETURN_v16i8:
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case WebAssembly::FALLTHROUGH_RETURN_v8i16:
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case WebAssembly::FALLTHROUGH_RETURN_v4i32:
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case WebAssembly::FALLTHROUGH_RETURN_v4f32: {
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// These instructions represent the implicit return at the end of a
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// function body. The operand is always a pop.
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assert(MFI->isVRegStackified(MI->getOperand(0).getReg()));
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if (isVerbose()) {
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OutStreamer->AddComment("fallthrough-return: $pop" +
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Twine(MFI->getWARegStackId(
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MFI->getWAReg(MI->getOperand(0).getReg()))));
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OutStreamer->AddBlankLine();
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}
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break;
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}
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case WebAssembly::FALLTHROUGH_RETURN_VOID:
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// This instruction represents the implicit return at the end of a
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// function body with no return value.
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if (isVerbose()) {
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OutStreamer->AddComment("fallthrough-return");
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OutStreamer->AddBlankLine();
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}
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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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const MCExpr *WebAssemblyAsmPrinter::lowerConstant(const Constant *CV) {
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if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
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if (GV->getValueType()->isFunctionTy()) {
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return MCSymbolRefExpr::create(
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getSymbol(GV), MCSymbolRefExpr::VK_WebAssembly_FUNCTION, OutContext);
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}
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return AsmPrinter::lowerConstant(CV);
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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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// The current approach to inline asm is that "r" constraints are expressed
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// as local indices, rather than values on the operand stack. This simplifies
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// using "r" as it eliminates the need to push and pop the values in a
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// particular order, however it also makes it impossible to have an "m"
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// constraint. So we don't support it.
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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(getTheWebAssemblyTarget32());
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RegisterAsmPrinter<WebAssemblyAsmPrinter> Y(getTheWebAssemblyTarget64());
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}
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