1*81ad6265SDimitry Andric //===- WasmWriter.h ---------------------------------------------*- C++ -*-===// 2*81ad6265SDimitry Andric // 3*81ad6265SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*81ad6265SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*81ad6265SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*81ad6265SDimitry Andric // 7*81ad6265SDimitry Andric //===----------------------------------------------------------------------===// 8*81ad6265SDimitry Andric 9*81ad6265SDimitry Andric #ifndef LLVM_LIB_OBJCOPY_WASM_WASMWRITER_H 10*81ad6265SDimitry Andric #define LLVM_LIB_OBJCOPY_WASM_WASMWRITER_H 11*81ad6265SDimitry Andric 12*81ad6265SDimitry Andric #include "WasmObject.h" 13*81ad6265SDimitry Andric #include <cstdint> 14*81ad6265SDimitry Andric #include <vector> 15*81ad6265SDimitry Andric 16*81ad6265SDimitry Andric namespace llvm { 17*81ad6265SDimitry Andric namespace objcopy { 18*81ad6265SDimitry Andric namespace wasm { 19*81ad6265SDimitry Andric 20*81ad6265SDimitry Andric class Writer { 21*81ad6265SDimitry Andric public: Writer(Object & Obj,raw_ostream & Out)22*81ad6265SDimitry Andric Writer(Object &Obj, raw_ostream &Out) : Obj(Obj), Out(Out) {} 23*81ad6265SDimitry Andric Error write(); 24*81ad6265SDimitry Andric 25*81ad6265SDimitry Andric private: 26*81ad6265SDimitry Andric using SectionHeader = SmallVector<char, 8>; 27*81ad6265SDimitry Andric Object &Obj; 28*81ad6265SDimitry Andric raw_ostream &Out; 29*81ad6265SDimitry Andric std::vector<SectionHeader> SectionHeaders; 30*81ad6265SDimitry Andric 31*81ad6265SDimitry Andric /// Generate a wasm section section header for S. 32*81ad6265SDimitry Andric /// The header consists of 33*81ad6265SDimitry Andric /// * A one-byte section ID (aka the section type). 34*81ad6265SDimitry Andric /// * The size of the section contents, encoded as ULEB128. 35*81ad6265SDimitry Andric /// * If the section is a custom section (type 0) it also has a name, which is 36*81ad6265SDimitry Andric /// encoded as a length-prefixed string. The encoded section size *includes* 37*81ad6265SDimitry Andric /// this string. 38*81ad6265SDimitry Andric /// See https://webassembly.github.io/spec/core/binary/modules.html#sections 39*81ad6265SDimitry Andric /// Return the header and store the total size in SectionSize. 40*81ad6265SDimitry Andric static SectionHeader createSectionHeader(const Section &S, 41*81ad6265SDimitry Andric size_t &SectionSize); 42*81ad6265SDimitry Andric size_t finalize(); 43*81ad6265SDimitry Andric }; 44*81ad6265SDimitry Andric 45*81ad6265SDimitry Andric } // end namespace wasm 46*81ad6265SDimitry Andric } // end namespace objcopy 47*81ad6265SDimitry Andric } // end namespace llvm 48*81ad6265SDimitry Andric 49*81ad6265SDimitry Andric #endif // LLVM_LIB_OBJCOPY_WASM_WASMWRITER_H 50