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https://github.com/c64scene-ar/llvm-6502.git
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3f2cb5c959
Summary: This prints assembly for int32 integer operations defined in WebAssemblyInstrInteger.td only, with major caveats: - The operation names are currently incorrect. - Other integer and floating-point types will be added later. - The printer isn't factored out to handle recursive AST code yet, since it can't even handle control flow anyways. - The assembly format isn't full s-expressions yet either, this will be added later. - This currently disables PrologEpilogCodeInserter as well as MachineCopyPropagation becasue they don't like virtual registers, which WebAssembly likes quite a bit. This will be fixed by factoring out NVPTX's change (currently a fork of PrologEpilogCodeInserter). Reviewers: sunfish Subscribers: llvm-commits, jfb Differential Revision: http://reviews.llvm.org/D11671 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243763 91177308-0d34-0410-b5e6-96231b3b80d8
126 lines
3.6 KiB
C++
126 lines
3.6 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 "WebAssemblyMachineFunctionInfo.h"
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#include "WebAssemblyRegisterInfo.h"
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#include "WebAssemblySubtarget.h"
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#include "InstPrinter/WebAssemblyInstPrinter.h"
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#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/CodeGen/AsmPrinter.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/IR/DebugInfo.h"
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#include "llvm/MC/MCStreamer.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 WebAssemblyInstrInfo *TII;
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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)), TII(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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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AsmPrinter::getAnalysisUsage(AU);
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}
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bool runOnMachineFunction(MachineFunction &MF) override {
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TII = static_cast<const WebAssemblyInstrInfo *>(
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MF.getSubtarget().getInstrInfo());
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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 EmitInstruction(const MachineInstr *MI) override;
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};
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} // end anonymous namespace
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//===----------------------------------------------------------------------===//
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void WebAssemblyAsmPrinter::EmitInstruction(const MachineInstr *MI) {
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SmallString<128> Str;
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raw_svector_ostream OS(Str);
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unsigned NumDefs = MI->getDesc().getNumDefs();
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assert(NumDefs <= 1 &&
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"Instructions with multiple result values not implemented");
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if (NumDefs != 0) {
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const MachineOperand &MO = MI->getOperand(0);
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unsigned Reg = MO.getReg();
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OS << "(setlocal @" << TargetRegisterInfo::virtReg2Index(Reg) << ' ';
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}
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OS << '(';
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bool PrintOperands = true;
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switch (MI->getOpcode()) {
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case WebAssembly::ARGUMENT:
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OS << "argument " << MI->getOperand(1).getImm();
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PrintOperands = false;
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break;
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default:
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OS << TII->getName(MI->getOpcode());
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break;
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}
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if (PrintOperands)
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for (const MachineOperand &MO : MI->uses()) {
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if (MO.isReg() && MO.isImplicit())
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continue;
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unsigned Reg = MO.getReg();
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OS << " @" << TargetRegisterInfo::virtReg2Index(Reg);
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}
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OS << ')';
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if (NumDefs != 0)
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OS << ')';
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OS << '\n';
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OutStreamer->EmitRawText(OS.str());
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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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