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1//===- WasmWriter.h ---------------------------------------------*- C++ -*-===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef LLVM_LIB_OBJCOPY_WASM_WASMWRITER_H10#define LLVM_LIB_OBJCOPY_WASM_WASMWRITER_H11 12#include "WasmObject.h"13#include <cstdint>14#include <vector>15 16namespace llvm {17namespace objcopy {18namespace wasm {19 20class Writer {21public:22 Writer(Object &Obj, raw_ostream &Out) : Obj(Obj), Out(Out) {}23 Error write();24 25private:26 using SectionHeader = SmallVector<char, 8>;27 Object &Obj;28 raw_ostream &Out;29 std::vector<SectionHeader> SectionHeaders;30 31 /// Generate a wasm section section header for S.32 /// The header consists of33 /// * A one-byte section ID (aka the section type).34 /// * The size of the section contents, encoded as ULEB128.35 /// * If the section is a custom section (type 0) it also has a name, which is36 /// encoded as a length-prefixed string. The encoded section size *includes*37 /// this string.38 /// See https://webassembly.github.io/spec/core/binary/modules.html#sections39 /// Return the header and store the total size in SectionSize.40 static SectionHeader createSectionHeader(const Section &S,41 size_t &SectionSize);42 size_t finalize();43};44 45} // end namespace wasm46} // end namespace objcopy47} // end namespace llvm48 49#endif // LLVM_LIB_OBJCOPY_WASM_WASMWRITER_H50