1b41599cf8
The .syntax unified directive and .codeX/.code X directives are, other than some simple common printing code, exclusively implemented in the targets themselves. Thus, remove the corresponding MCAF_* flags and reimplement the directives solely within the targets. This avoids exposing all targets to all other targets' flags. Since MCAF_SubsectionsViaSymbols is all that remains, convert it to its own function like other directives, simplifying its implementation. Note that, on X86, we now always need a target streamer when parsing assembly, as it's now used for directives that aren't COFF-specific. It still does not however need to do anything when producing a non-COFF object file, so this commit does not introduce any new target streamers. There is some churn in test output, and corresponding UTC regex changes, due to comments no longer being flushed by these various directives (and EmitEOL is not exposed outside MCAsmStreamer.cpp so we couldn't do so even if we wanted to), but that was a bit odd to be doing anyway. This is motivated by Morello LLVM, which adds yet another assembler flag to distinguish A64 and C64 instruction sets, but did not update every switch and so emits warnings during the build. Rather than fix those warnings it seems better to instead make the problem not exist in the first place via this change.
87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
//===- RecordStreamer.h - Record asm defined and used symbols ---*- 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_OBJECT_RECORDSTREAMER_H
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#define LLVM_LIB_OBJECT_RECORDSTREAMER_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/MapVector.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/MC/MCDirectives.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Support/SMLoc.h"
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#include <vector>
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namespace llvm {
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class MCSymbol;
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class Module;
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class RecordStreamer : public MCStreamer {
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public:
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enum State { NeverSeen, Global, Defined, DefinedGlobal, DefinedWeak, Used,
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UndefinedWeak};
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private:
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const Module &M;
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StringMap<State> Symbols;
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// Map of aliases created by .symver directives, saved so we can update
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// their symbol binding after parsing complete. This maps from each
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// aliasee to its list of aliases.
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MapVector<const MCSymbol *, std::vector<StringRef>> SymverAliasMap;
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/// Get the state recorded for the given symbol.
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State getSymbolState(const MCSymbol *Sym);
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void markDefined(const MCSymbol &Symbol);
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void markGlobal(const MCSymbol &Symbol, MCSymbolAttr Attribute);
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void markUsed(const MCSymbol &Symbol);
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void visitUsedSymbol(const MCSymbol &Sym) override;
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public:
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RecordStreamer(MCContext &Context, const Module &M);
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void emitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
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void emitAssignment(MCSymbol *Symbol, const MCExpr *Value) override;
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bool emitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
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void emitZerofill(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
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Align ByteAlignment, SMLoc Loc = SMLoc()) override;
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void emitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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Align ByteAlignment) override;
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// Ignore format-specific directives; we do not need any information from
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// them, but the default implementation of these methods crashes, so we
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// override them with versions that do nothing.
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void emitSubsectionsViaSymbols() override {};
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void beginCOFFSymbolDef(const MCSymbol *Symbol) override {}
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void emitCOFFSymbolStorageClass(int StorageClass) override {}
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void emitCOFFSymbolType(int Type) override {}
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void endCOFFSymbolDef() override {}
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/// Record .symver aliases for later processing.
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void emitELFSymverDirective(const MCSymbol *OriginalSym, StringRef Name,
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bool KeepOriginalSym) override;
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// Emit ELF .symver aliases and ensure they have the same binding as the
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// defined symbol they alias with.
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void flushSymverDirectives();
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// Symbols iterators
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using const_iterator = StringMap<State>::const_iterator;
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const_iterator begin();
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const_iterator end();
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// SymverAliasMap iterators
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using const_symver_iterator = decltype(SymverAliasMap)::const_iterator;
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iterator_range<const_symver_iterator> symverAliases();
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};
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} // end namespace llvm
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#endif // LLVM_LIB_OBJECT_RECORDSTREAMER_H
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