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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
60 lines
1.3 KiB
C++
60 lines
1.3 KiB
C++
//===-- MCTargetOptionsCommandFlags.h --------------------------*- 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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//
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// This file contains machine code-specific flags that are shared between
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// different command line tools.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCTARGETOPTIONSCOMMANDFLAGS_H
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#define LLVM_MC_MCTARGETOPTIONSCOMMANDFLAGS_H
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#include "llvm/ADT/Optional.h"
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#include <string>
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namespace llvm {
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class MCTargetOptions;
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namespace mc {
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bool getRelaxAll();
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Optional<bool> getExplicitRelaxAll();
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bool getIncrementalLinkerCompatible();
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int getDwarfVersion();
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bool getDwarf64();
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bool getShowMCInst();
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bool getFatalWarnings();
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bool getNoWarn();
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bool getNoDeprecatedWarn();
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bool getNoTypeCheck();
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std::string getABIName();
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/// Create this object with static storage to register mc-related command
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/// line options.
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struct RegisterMCTargetOptionsFlags {
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RegisterMCTargetOptionsFlags();
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};
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MCTargetOptions InitMCTargetOptionsFromFlags();
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} // namespace mc
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} // namespace llvm
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#endif
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