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Previously when objcopy generated section headers, it padded the LEB that encodes the section size out to 5 bytes, matching the behavior of clang. This is correct, but results in a binary that differs from the input. This can sometimes have undesirable consequences (e.g. breaking source maps). This change makes the object reader remember the size of the LEB encoding in the section header, so that llvm-objcopy can reproduce it exactly. For sections not read from an object file (e.g. that llvm-objcopy is adding itself), pad to 5 bytes. Reviewed By: jhenderson Differential Revision: https://reviews.llvm.org/D155535
49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
//===- WasmObject.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 LLVM_LIB_OBJCOPY_WASM_WASMOBJECT_H
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#define LLVM_LIB_OBJCOPY_WASM_WASMOBJECT_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Object/Wasm.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include <vector>
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namespace llvm {
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namespace objcopy {
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namespace wasm {
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struct Section {
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// For now, each section is only an opaque binary blob with no distinction
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// between custom and known sections.
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uint8_t SectionType;
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std::optional<uint8_t> HeaderSecSizeEncodingLen;
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StringRef Name;
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ArrayRef<uint8_t> Contents;
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};
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struct Object {
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llvm::wasm::WasmObjectHeader Header;
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// For now don't discriminate between kinds of sections.
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std::vector<Section> Sections;
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void addSectionWithOwnedContents(Section NewSection,
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std::unique_ptr<MemoryBuffer> &&Content);
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void removeSections(function_ref<bool(const Section &)> ToRemove);
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private:
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std::vector<std::unique_ptr<MemoryBuffer>> OwnedContents;
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};
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} // end namespace wasm
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} // end namespace objcopy
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} // end namespace llvm
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#endif // LLVM_LIB_OBJCOPY_WASM_WASMOBJECT_H
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