forked from OSchip/llvm-project
79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
//===- LinkerScript.h -------------------------------------------*- C++ -*-===//
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//
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// The LLVM Linker
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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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#ifndef LLD_ELF_LINKER_SCRIPT_H
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#define LLD_ELF_LINKER_SCRIPT_H
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#include "lld/Core/LLVM.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/Support/Allocator.h"
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#include "llvm/Support/MemoryBuffer.h"
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namespace lld {
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namespace elf {
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class ScriptParser;
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template <class ELFT> class InputSectionBase;
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// This class represents each rule in SECTIONS command.
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class SectionRule {
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public:
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SectionRule(StringRef D, StringRef S, bool Keep)
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: Dest(D), Keep(Keep), SectionPattern(S) {}
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// Returns true if S should be in Dest section.
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template <class ELFT> bool match(InputSectionBase<ELFT> *S);
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StringRef Dest;
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// KEEP command saves unused sections even if --gc-sections is specified.
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bool Keep = false;
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private:
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StringRef SectionPattern;
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};
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// This is a runner of the linker script.
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class LinkerScript {
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friend class ScriptParser;
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public:
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// Parses a linker script. Calling this function may update
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// this object and Config.
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void read(MemoryBufferRef MB);
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template <class ELFT> StringRef getOutputSection(InputSectionBase<ELFT> *S);
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ArrayRef<uint8_t> getFiller(StringRef Name);
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template <class ELFT> bool isDiscarded(InputSectionBase<ELFT> *S);
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template <class ELFT> bool shouldKeep(InputSectionBase<ELFT> *S);
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int compareSections(StringRef A, StringRef B);
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private:
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template <class ELFT> SectionRule *find(InputSectionBase<ELFT> *S);
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// SECTIONS commands.
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std::vector<SectionRule> Sections;
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// Output sections are sorted by this order.
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std::vector<StringRef> SectionOrder;
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// Section fill attribute for each section.
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llvm::StringMap<std::vector<uint8_t>> Filler;
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llvm::BumpPtrAllocator Alloc;
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};
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extern LinkerScript *Script;
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} // namespace elf
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} // namespace lld
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#endif
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