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This to protect against non-sensical instruction sequences being assembled, which would either cause asserts/crashes further down, or a Wasm module being output that doesn't validate. Unlike a validator, this type checker is able to give type-errors as part of the parsing process, which makes the assembler much friendlier to be used by humans writing manual input. Because the MC system is single pass (instructions aren't even stored in MC format, they are directly output) the type checker has to be single pass as well, which means that from now on .globaltype and .functype decls must come before their use. An extra pass is added to Codegen to collect information for this purpose, since AsmPrinter is normally single pass / streaming as well, and would otherwise generate this information on the fly. A `-no-type-check` flag was added to llvm-mc (and any other tools that take asm input) that surpresses type errors, as a quick escape hatch for tests that were not intended to be type correct. This is a first version of the type checker that ignores control flow, i.e. it checks that types are correct along the linear path, but not the branch path. This will still catch most errors. Branch checking could be added in the future. Differential Revision: https://reviews.llvm.org/D104945
93 lines
3.6 KiB
C++
93 lines
3.6 KiB
C++
// WebAssemblyAsmPrinter.h - WebAssembly implementation of AsmPrinter-*- C++ -*-
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYASMPRINTER_H
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#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYASMPRINTER_H
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#include "WebAssemblyMachineFunctionInfo.h"
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#include "WebAssemblySubtarget.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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class WebAssemblyTargetStreamer;
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class LLVM_LIBRARY_VISIBILITY WebAssemblyAsmPrinter final : public AsmPrinter {
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const WebAssemblySubtarget *Subtarget;
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const MachineRegisterInfo *MRI;
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WebAssemblyFunctionInfo *MFI;
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// TODO: Do the uniquing of Signatures here instead of ObjectFileWriter?
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std::vector<std::unique_ptr<wasm::WasmSignature>> Signatures;
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std::vector<std::unique_ptr<std::string>> Names;
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bool signaturesEmitted = false;
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StringRef storeName(StringRef Name) {
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std::unique_ptr<std::string> N = std::make_unique<std::string>(Name);
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Names.push_back(std::move(N));
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return *Names.back();
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}
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public:
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explicit WebAssemblyAsmPrinter(TargetMachine &TM,
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std::unique_ptr<MCStreamer> Streamer)
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: AsmPrinter(TM, std::move(Streamer)), Subtarget(nullptr), MRI(nullptr),
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MFI(nullptr) {}
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StringRef getPassName() const override {
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return "WebAssembly Assembly Printer";
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}
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const WebAssemblySubtarget &getSubtarget() const { return *Subtarget; }
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void addSignature(std::unique_ptr<wasm::WasmSignature> &&Sig) {
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Signatures.push_back(std::move(Sig));
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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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Subtarget = &MF.getSubtarget<WebAssemblySubtarget>();
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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 emitEndOfAsmFile(Module &M) override;
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void EmitProducerInfo(Module &M);
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void EmitTargetFeatures(Module &M);
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void emitGlobalVariable(const GlobalVariable *GV) override;
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void emitJumpTableInfo() override;
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void emitConstantPool() override;
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void emitLinkage(const GlobalValue *, MCSymbol *) const 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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const char *ExtraCode, raw_ostream &OS) override;
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bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
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const char *ExtraCode, raw_ostream &OS) override;
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MVT getRegType(unsigned RegNo) const;
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std::string regToString(const MachineOperand &MO);
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WebAssemblyTargetStreamer *getTargetStreamer();
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MCSymbolWasm *getMCSymbolForFunction(const Function *F, bool EnableEmEH,
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wasm::WasmSignature *Sig,
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bool &InvokeDetected);
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MCSymbol *getOrCreateWasmSymbol(StringRef Name);
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void emitExternalDecls(const Module &M);
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};
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} // end namespace llvm
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#endif
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