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0c7127a873
Debug info sections need R_WASM_FUNCTION_OFFSET_I32 relocs (with FK_Data_4 fixup kinds) to refer to functions (instead of R_WASM_TABLE_INDEX as is used in data sections). Usually this is done in a convoluted way, with unnamed temp data symbols which target the start of the function, in which case WasmObjectWriter::recordRelocation converts it to use the section symbol instead. However in some cases the function can actually be undefined; in this case the dwarf generator uses the function symbol (a named undefined function symbol) instead. In that case the section-symbol transform doesn't work and we need to generate the correct reloc type a different way. In this change WebAssemblyWasmObjectWriter::getRelocType takes the fixup section type into account to choose the correct reloc type. Fixes PR50408 Differential Revision: https://reviews.llvm.org/D103557
64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
//===-- llvm/MC/MCWasmObjectWriter.h - Wasm Object Writer -------*- 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_MC_MCWASMOBJECTWRITER_H
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#define LLVM_MC_MCWASMOBJECTWRITER_H
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#include "llvm/MC/MCObjectWriter.h"
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#include <memory>
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namespace llvm {
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class MCFixup;
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class MCSectionWasm;
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class MCValue;
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class raw_pwrite_stream;
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class MCWasmObjectTargetWriter : public MCObjectTargetWriter {
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const unsigned Is64Bit : 1;
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const unsigned IsEmscripten : 1;
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protected:
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explicit MCWasmObjectTargetWriter(bool Is64Bit_, bool IsEmscripten);
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public:
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virtual ~MCWasmObjectTargetWriter();
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Triple::ObjectFormatType getFormat() const override { return Triple::Wasm; }
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static bool classof(const MCObjectTargetWriter *W) {
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return W->getFormat() == Triple::Wasm;
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}
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virtual unsigned getRelocType(const MCValue &Target, const MCFixup &Fixup,
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const MCSectionWasm &FixupSection,
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bool IsLocRel) const = 0;
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/// \name Accessors
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/// @{
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bool is64Bit() const { return Is64Bit; }
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bool isEmscripten() const { return IsEmscripten; }
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/// @}
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};
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/// Construct a new Wasm writer instance.
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///
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/// \param MOTW - The target specific Wasm writer subclass.
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/// \param OS - The stream to write to.
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/// \returns The constructed object writer.
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std::unique_ptr<MCObjectWriter>
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createWasmObjectWriter(std::unique_ptr<MCWasmObjectTargetWriter> MOTW,
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raw_pwrite_stream &OS);
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std::unique_ptr<MCObjectWriter>
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createWasmDwoObjectWriter(std::unique_ptr<MCWasmObjectTargetWriter> MOTW,
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raw_pwrite_stream &OS, raw_pwrite_stream &DwoOS);
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} // namespace llvm
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#endif
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