forked from OSchip/llvm-project
140 lines
4.1 KiB
C++
140 lines
4.1 KiB
C++
//===- OutputSections.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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#ifndef LLD_WASM_OUTPUT_SECTIONS_H
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#define LLD_WASM_OUTPUT_SECTIONS_H
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#include "InputChunks.h"
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#include "WriterUtils.h"
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#include "lld/Common/ErrorHandler.h"
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#include "lld/Common/LLVM.h"
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#include "llvm/ADT/DenseMap.h"
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namespace lld {
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namespace wasm {
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class OutputSection;
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}
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std::string toString(const wasm::OutputSection §ion);
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namespace wasm {
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class OutputSegment;
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class OutputSection {
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public:
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OutputSection(uint32_t type, std::string name = "")
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: type(type), name(name) {}
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virtual ~OutputSection() = default;
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StringRef getSectionName() const;
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void setOffset(size_t newOffset) {
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log("setOffset: " + toString(*this) + ": " + Twine(newOffset));
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offset = newOffset;
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}
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void createHeader(size_t bodySize);
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virtual bool isNeeded() const { return true; }
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virtual size_t getSize() const = 0;
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virtual size_t getOffset() { return offset; }
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virtual void writeTo(uint8_t *buf) = 0;
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virtual void finalizeContents() = 0;
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virtual uint32_t getNumRelocations() const { return 0; }
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virtual void writeRelocations(raw_ostream &os) const {}
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std::string header;
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uint32_t type;
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uint32_t sectionIndex = UINT32_MAX;
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std::string name;
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OutputSectionSymbol *sectionSym = nullptr;
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protected:
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size_t offset = 0;
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};
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class CodeSection : public OutputSection {
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public:
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explicit CodeSection(ArrayRef<InputFunction *> functions)
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: OutputSection(llvm::wasm::WASM_SEC_CODE), functions(functions) {}
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static bool classof(const OutputSection *sec) {
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return sec->type == llvm::wasm::WASM_SEC_CODE;
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}
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size_t getSize() const override { return header.size() + bodySize; }
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void writeTo(uint8_t *buf) override;
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uint32_t getNumRelocations() const override;
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void writeRelocations(raw_ostream &os) const override;
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bool isNeeded() const override { return functions.size() > 0; }
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void finalizeContents() override;
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ArrayRef<InputFunction *> functions;
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protected:
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std::string codeSectionHeader;
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size_t bodySize = 0;
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};
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class DataSection : public OutputSection {
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public:
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explicit DataSection(ArrayRef<OutputSegment *> segments)
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: OutputSection(llvm::wasm::WASM_SEC_DATA), segments(segments) {}
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static bool classof(const OutputSection *sec) {
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return sec->type == llvm::wasm::WASM_SEC_DATA;
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}
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size_t getSize() const override { return header.size() + bodySize; }
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void writeTo(uint8_t *buf) override;
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uint32_t getNumRelocations() const override;
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void writeRelocations(raw_ostream &os) const override;
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bool isNeeded() const override;
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void finalizeContents() override;
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ArrayRef<OutputSegment *> segments;
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protected:
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std::string dataSectionHeader;
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size_t bodySize = 0;
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};
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// Represents a custom section in the output file. Wasm custom sections are
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// used for storing user-defined metadata. Unlike the core sections types
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// they are identified by their string name.
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// The linker combines custom sections that have the same name by simply
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// concatenating them.
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// Note that some custom sections such as "name" and "linking" are handled
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// separately and are instead synthesized by the linker.
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class CustomSection : public OutputSection {
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public:
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CustomSection(std::string name, ArrayRef<InputSection *> inputSections)
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: OutputSection(llvm::wasm::WASM_SEC_CUSTOM, name),
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inputSections(inputSections) {}
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static bool classof(const OutputSection *sec) {
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return sec->type == llvm::wasm::WASM_SEC_CUSTOM;
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}
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size_t getSize() const override {
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return header.size() + nameData.size() + payloadSize;
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}
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void writeTo(uint8_t *buf) override;
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uint32_t getNumRelocations() const override;
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void writeRelocations(raw_ostream &os) const override;
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void finalizeContents() override;
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protected:
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size_t payloadSize = 0;
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ArrayRef<InputSection *> inputSections;
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std::string nameData;
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};
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} // namespace wasm
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} // namespace lld
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#endif // LLD_WASM_OUTPUT_SECTIONS_H
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