forked from OSchip/llvm-project
992 lines
31 KiB
C++
992 lines
31 KiB
C++
//===- WasmObjectFile.cpp - Wasm object file implementation ---------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/BinaryFormat/Wasm.h"
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#include "llvm/MC/SubtargetFeature.h"
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#include "llvm/Object/Binary.h"
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#include "llvm/Object/Error.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Object/SymbolicFile.h"
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#include "llvm/Object/Wasm.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/LEB128.h"
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#include <algorithm>
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#include <cassert>
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#include <cstdint>
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#include <cstring>
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#include <system_error>
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#define DEBUG_TYPE "wasm-object"
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using namespace llvm;
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using namespace object;
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Expected<std::unique_ptr<WasmObjectFile>>
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ObjectFile::createWasmObjectFile(MemoryBufferRef Buffer) {
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Error Err = Error::success();
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auto ObjectFile = llvm::make_unique<WasmObjectFile>(Buffer, Err);
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if (Err)
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return std::move(Err);
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return std::move(ObjectFile);
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}
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#define VARINT7_MAX ((1<<7)-1)
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#define VARINT7_MIN (-(1<<7))
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#define VARUINT7_MAX (1<<7)
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#define VARUINT1_MAX (1)
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static uint8_t readUint8(const uint8_t *&Ptr) { return *Ptr++; }
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static uint32_t readUint32(const uint8_t *&Ptr) {
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uint32_t Result = support::endian::read32le(Ptr);
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Ptr += sizeof(Result);
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return Result;
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}
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static int32_t readFloat32(const uint8_t *&Ptr) {
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int32_t Result = 0;
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memcpy(&Result, Ptr, sizeof(Result));
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Ptr += sizeof(Result);
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return Result;
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}
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static int64_t readFloat64(const uint8_t *&Ptr) {
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int64_t Result = 0;
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memcpy(&Result, Ptr, sizeof(Result));
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Ptr += sizeof(Result);
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return Result;
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}
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static uint64_t readULEB128(const uint8_t *&Ptr) {
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unsigned Count;
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uint64_t Result = decodeULEB128(Ptr, &Count);
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Ptr += Count;
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return Result;
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}
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static StringRef readString(const uint8_t *&Ptr) {
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uint32_t StringLen = readULEB128(Ptr);
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StringRef Return = StringRef(reinterpret_cast<const char *>(Ptr), StringLen);
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Ptr += StringLen;
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return Return;
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}
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static int64_t readLEB128(const uint8_t *&Ptr) {
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unsigned Count;
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uint64_t Result = decodeSLEB128(Ptr, &Count);
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Ptr += Count;
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return Result;
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}
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static uint8_t readVaruint1(const uint8_t *&Ptr) {
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int64_t result = readLEB128(Ptr);
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assert(result <= VARUINT1_MAX && result >= 0);
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return result;
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}
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static int8_t readVarint7(const uint8_t *&Ptr) {
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int64_t result = readLEB128(Ptr);
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assert(result <= VARINT7_MAX && result >= VARINT7_MIN);
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return result;
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}
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static uint8_t readVaruint7(const uint8_t *&Ptr) {
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uint64_t result = readULEB128(Ptr);
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assert(result <= VARUINT7_MAX);
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return result;
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}
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static int32_t readVarint32(const uint8_t *&Ptr) {
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int64_t result = readLEB128(Ptr);
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assert(result <= INT32_MAX && result >= INT32_MIN);
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return result;
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}
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static uint32_t readVaruint32(const uint8_t *&Ptr) {
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uint64_t result = readULEB128(Ptr);
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assert(result <= UINT32_MAX);
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return result;
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}
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static int64_t readVarint64(const uint8_t *&Ptr) {
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return readLEB128(Ptr);
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}
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static uint8_t readOpcode(const uint8_t *&Ptr) {
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return readUint8(Ptr);
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}
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static Error readInitExpr(wasm::WasmInitExpr &Expr, const uint8_t *&Ptr) {
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Expr.Opcode = readOpcode(Ptr);
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switch (Expr.Opcode) {
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case wasm::WASM_OPCODE_I32_CONST:
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Expr.Value.Int32 = readVarint32(Ptr);
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break;
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case wasm::WASM_OPCODE_I64_CONST:
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Expr.Value.Int64 = readVarint64(Ptr);
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break;
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case wasm::WASM_OPCODE_F32_CONST:
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Expr.Value.Float32 = readFloat32(Ptr);
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break;
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case wasm::WASM_OPCODE_F64_CONST:
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Expr.Value.Float64 = readFloat64(Ptr);
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break;
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case wasm::WASM_OPCODE_GET_GLOBAL:
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Expr.Value.Global = readULEB128(Ptr);
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break;
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default:
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return make_error<GenericBinaryError>("Invalid opcode in init_expr",
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object_error::parse_failed);
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}
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uint8_t EndOpcode = readOpcode(Ptr);
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if (EndOpcode != wasm::WASM_OPCODE_END) {
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return make_error<GenericBinaryError>("Invalid init_expr",
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object_error::parse_failed);
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}
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return Error::success();
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}
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static wasm::WasmLimits readLimits(const uint8_t *&Ptr) {
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wasm::WasmLimits Result;
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Result.Flags = readVaruint1(Ptr);
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Result.Initial = readVaruint32(Ptr);
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if (Result.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX)
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Result.Maximum = readVaruint32(Ptr);
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return Result;
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}
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static wasm::WasmTable readTable(const uint8_t *&Ptr) {
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wasm::WasmTable Table;
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Table.ElemType = readVarint7(Ptr);
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Table.Limits = readLimits(Ptr);
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return Table;
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}
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static Error readSection(WasmSection &Section, const uint8_t *&Ptr,
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const uint8_t *Start) {
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// TODO(sbc): Avoid reading past EOF in the case of malformed files.
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Section.Offset = Ptr - Start;
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Section.Type = readVaruint7(Ptr);
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uint32_t Size = readVaruint32(Ptr);
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if (Size == 0)
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return make_error<StringError>("Zero length section",
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object_error::parse_failed);
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Section.Content = ArrayRef<uint8_t>(Ptr, Size);
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Ptr += Size;
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return Error::success();
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}
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WasmObjectFile::WasmObjectFile(MemoryBufferRef Buffer, Error &Err)
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: ObjectFile(Binary::ID_Wasm, Buffer) {
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LinkingData.DataAlignment = 0;
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LinkingData.DataSize = 0;
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ErrorAsOutParameter ErrAsOutParam(&Err);
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Header.Magic = getData().substr(0, 4);
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if (Header.Magic != StringRef("\0asm", 4)) {
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Err = make_error<StringError>("Bad magic number",
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object_error::parse_failed);
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return;
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}
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const uint8_t *Ptr = getPtr(4);
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Header.Version = readUint32(Ptr);
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if (Header.Version != wasm::WasmVersion) {
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Err = make_error<StringError>("Bad version number",
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object_error::parse_failed);
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return;
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}
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const uint8_t *Eof = getPtr(getData().size());
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WasmSection Sec;
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while (Ptr < Eof) {
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if ((Err = readSection(Sec, Ptr, getPtr(0))))
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return;
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if ((Err = parseSection(Sec)))
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return;
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Sections.push_back(Sec);
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}
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}
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Error WasmObjectFile::parseSection(WasmSection &Sec) {
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const uint8_t* Start = Sec.Content.data();
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const uint8_t* End = Start + Sec.Content.size();
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switch (Sec.Type) {
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case wasm::WASM_SEC_CUSTOM:
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return parseCustomSection(Sec, Start, End);
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case wasm::WASM_SEC_TYPE:
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return parseTypeSection(Start, End);
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case wasm::WASM_SEC_IMPORT:
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return parseImportSection(Start, End);
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case wasm::WASM_SEC_FUNCTION:
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return parseFunctionSection(Start, End);
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case wasm::WASM_SEC_TABLE:
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return parseTableSection(Start, End);
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case wasm::WASM_SEC_MEMORY:
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return parseMemorySection(Start, End);
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case wasm::WASM_SEC_GLOBAL:
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return parseGlobalSection(Start, End);
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case wasm::WASM_SEC_EXPORT:
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return parseExportSection(Start, End);
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case wasm::WASM_SEC_START:
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return parseStartSection(Start, End);
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case wasm::WASM_SEC_ELEM:
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return parseElemSection(Start, End);
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case wasm::WASM_SEC_CODE:
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return parseCodeSection(Start, End);
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case wasm::WASM_SEC_DATA:
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return parseDataSection(Start, End);
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default:
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return make_error<GenericBinaryError>("Bad section type",
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object_error::parse_failed);
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}
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}
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Error WasmObjectFile::parseNameSection(const uint8_t *Ptr, const uint8_t *End) {
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while (Ptr < End) {
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uint8_t Type = readVarint7(Ptr);
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uint32_t Size = readVaruint32(Ptr);
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const uint8_t *SubSectionEnd = Ptr + Size;
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switch (Type) {
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case wasm::WASM_NAMES_FUNCTION: {
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uint32_t Count = readVaruint32(Ptr);
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while (Count--) {
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uint32_t Index = readVaruint32(Ptr);
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StringRef Name = readString(Ptr);
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if (!Name.empty())
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Symbols.emplace_back(Name,
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WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME,
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Sections.size(), Index);
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}
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break;
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}
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// Ignore local names for now
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case wasm::WASM_NAMES_LOCAL:
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default:
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Ptr += Size;
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break;
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}
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if (Ptr != SubSectionEnd)
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return make_error<GenericBinaryError>("Name sub-section ended prematurely",
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object_error::parse_failed);
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}
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if (Ptr != End)
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return make_error<GenericBinaryError>("Name section ended prematurely",
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object_error::parse_failed);
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return Error::success();
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}
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Error WasmObjectFile::parseLinkingSection(const uint8_t *Ptr,
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const uint8_t *End) {
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HasLinkingSection = true;
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while (Ptr < End) {
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uint8_t Type = readVarint7(Ptr);
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uint32_t Size = readVaruint32(Ptr);
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const uint8_t *SubSectionEnd = Ptr + Size;
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switch (Type) {
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case wasm::WASM_SYMBOL_INFO: {
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uint32_t Count = readVaruint32(Ptr);
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while (Count--) {
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StringRef Symbol = readString(Ptr);
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DEBUG(dbgs() << "reading syminfo: " << Symbol << "\n");
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uint32_t Flags = readVaruint32(Ptr);
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auto iter = SymbolMap.find(Symbol);
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if (iter == SymbolMap.end()) {
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return make_error<GenericBinaryError>(
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"Invalid symbol name in linking section: " + Symbol,
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object_error::parse_failed);
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}
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uint32_t SymIndex = iter->second;
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assert(SymIndex < Symbols.size());
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Symbols[SymIndex].Flags = Flags;
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DEBUG(dbgs() << "Set symbol flags index:"
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<< SymIndex << " name:"
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<< Symbols[SymIndex].Name << " exptected:"
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<< Symbol << " flags: " << Flags << "\n");
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}
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break;
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}
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case wasm::WASM_DATA_SIZE:
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LinkingData.DataSize = readVaruint32(Ptr);
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break;
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case wasm::WASM_DATA_ALIGNMENT:
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LinkingData.DataAlignment = readVaruint32(Ptr);
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break;
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case wasm::WASM_STACK_POINTER:
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default:
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Ptr += Size;
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break;
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}
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if (Ptr != SubSectionEnd)
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return make_error<GenericBinaryError>(
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"Linking sub-section ended prematurely", object_error::parse_failed);
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}
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if (Ptr != End)
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return make_error<GenericBinaryError>("Linking section ended prematurely",
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object_error::parse_failed);
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return Error::success();
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}
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WasmSection* WasmObjectFile::findCustomSectionByName(StringRef Name) {
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for (WasmSection& Section : Sections) {
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if (Section.Type == wasm::WASM_SEC_CUSTOM && Section.Name == Name)
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return &Section;
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}
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return nullptr;
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}
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WasmSection* WasmObjectFile::findSectionByType(uint32_t Type) {
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assert(Type != wasm::WASM_SEC_CUSTOM);
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for (WasmSection& Section : Sections) {
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if (Section.Type == Type)
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return &Section;
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}
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return nullptr;
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}
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Error WasmObjectFile::parseRelocSection(StringRef Name, const uint8_t *Ptr,
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const uint8_t *End) {
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uint8_t SectionCode = readVarint7(Ptr);
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WasmSection* Section = nullptr;
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if (SectionCode == wasm::WASM_SEC_CUSTOM) {
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StringRef Name = readString(Ptr);
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Section = findCustomSectionByName(Name);
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} else {
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Section = findSectionByType(SectionCode);
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}
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if (!Section)
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return make_error<GenericBinaryError>("Invalid section code",
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object_error::parse_failed);
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uint32_t RelocCount = readVaruint32(Ptr);
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while (RelocCount--) {
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wasm::WasmRelocation Reloc;
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memset(&Reloc, 0, sizeof(Reloc));
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Reloc.Type = readVaruint32(Ptr);
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Reloc.Offset = readVaruint32(Ptr);
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Reloc.Index = readVaruint32(Ptr);
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switch (Reloc.Type) {
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case wasm::R_WEBASSEMBLY_FUNCTION_INDEX_LEB:
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case wasm::R_WEBASSEMBLY_TABLE_INDEX_SLEB:
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case wasm::R_WEBASSEMBLY_TABLE_INDEX_I32:
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case wasm::R_WEBASSEMBLY_TYPE_INDEX_LEB:
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case wasm::R_WEBASSEMBLY_GLOBAL_INDEX_LEB:
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break;
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case wasm::R_WEBASSEMBLY_GLOBAL_ADDR_LEB:
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case wasm::R_WEBASSEMBLY_GLOBAL_ADDR_SLEB:
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case wasm::R_WEBASSEMBLY_GLOBAL_ADDR_I32:
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Reloc.Addend = readVarint32(Ptr);
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break;
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default:
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return make_error<GenericBinaryError>("Bad relocation type: " +
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Twine(Reloc.Type),
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object_error::parse_failed);
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}
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Section->Relocations.push_back(Reloc);
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}
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if (Ptr != End)
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return make_error<GenericBinaryError>("Reloc section ended prematurely",
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object_error::parse_failed);
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return Error::success();
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}
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Error WasmObjectFile::parseCustomSection(WasmSection &Sec,
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const uint8_t *Ptr, const uint8_t *End) {
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Sec.Name = readString(Ptr);
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if (Sec.Name == "name") {
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if (Error Err = parseNameSection(Ptr, End))
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return Err;
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} else if (Sec.Name == "linking") {
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if (Error Err = parseLinkingSection(Ptr, End))
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return Err;
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} else if (Sec.Name.startswith("reloc.")) {
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if (Error Err = parseRelocSection(Sec.Name, Ptr, End))
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return Err;
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}
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return Error::success();
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}
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Error WasmObjectFile::parseTypeSection(const uint8_t *Ptr, const uint8_t *End) {
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uint32_t Count = readVaruint32(Ptr);
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Signatures.reserve(Count);
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while (Count--) {
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wasm::WasmSignature Sig;
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Sig.ReturnType = wasm::WASM_TYPE_NORESULT;
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int8_t Form = readVarint7(Ptr);
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if (Form != wasm::WASM_TYPE_FUNC) {
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return make_error<GenericBinaryError>("Invalid signature type",
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object_error::parse_failed);
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}
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uint32_t ParamCount = readVaruint32(Ptr);
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Sig.ParamTypes.reserve(ParamCount);
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while (ParamCount--) {
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uint32_t ParamType = readVarint7(Ptr);
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Sig.ParamTypes.push_back(ParamType);
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}
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uint32_t ReturnCount = readVaruint32(Ptr);
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if (ReturnCount) {
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if (ReturnCount != 1) {
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return make_error<GenericBinaryError>(
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"Multiple return types not supported", object_error::parse_failed);
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}
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Sig.ReturnType = readVarint7(Ptr);
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}
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Signatures.push_back(Sig);
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}
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if (Ptr != End)
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return make_error<GenericBinaryError>("Type section ended prematurely",
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object_error::parse_failed);
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return Error::success();
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}
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Error WasmObjectFile::parseImportSection(const uint8_t *Ptr, const uint8_t *End) {
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uint32_t Count = readVaruint32(Ptr);
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Imports.reserve(Count);
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for (uint32_t i = 0; i < Count; i++) {
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wasm::WasmImport Im;
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Im.Module = readString(Ptr);
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Im.Field = readString(Ptr);
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Im.Kind = readUint8(Ptr);
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switch (Im.Kind) {
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case wasm::WASM_EXTERNAL_FUNCTION:
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Im.SigIndex = readVaruint32(Ptr);
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SymbolMap.try_emplace(Im.Field, Symbols.size());
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Symbols.emplace_back(Im.Field, WasmSymbol::SymbolType::FUNCTION_IMPORT,
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Sections.size(), i);
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DEBUG(dbgs() << "Adding import: " << Symbols.back()
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<< " sym index:" << Symbols.size() << "\n");
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break;
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case wasm::WASM_EXTERNAL_GLOBAL:
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Im.Global.Type = readVarint7(Ptr);
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Im.Global.Mutable = readVaruint1(Ptr);
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SymbolMap.try_emplace(Im.Field, Symbols.size());
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Symbols.emplace_back(Im.Field, WasmSymbol::SymbolType::GLOBAL_IMPORT,
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Sections.size(), i);
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DEBUG(dbgs() << "Adding import: " << Symbols.back()
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<< " sym index:" << Symbols.size() << "\n");
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break;
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case wasm::WASM_EXTERNAL_MEMORY:
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Im.Memory = readLimits(Ptr);
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break;
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case wasm::WASM_EXTERNAL_TABLE:
|
|
Im.Table = readTable(Ptr);
|
|
if (Im.Table.ElemType != wasm::WASM_TYPE_ANYFUNC) {
|
|
return make_error<GenericBinaryError>("Invalid table element type",
|
|
object_error::parse_failed);
|
|
}
|
|
break;
|
|
default:
|
|
return make_error<GenericBinaryError>(
|
|
"Unexpected import kind", object_error::parse_failed);
|
|
}
|
|
Imports.push_back(Im);
|
|
}
|
|
if (Ptr != End)
|
|
return make_error<GenericBinaryError>("Import section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseFunctionSection(const uint8_t *Ptr, const uint8_t *End) {
|
|
uint32_t Count = readVaruint32(Ptr);
|
|
FunctionTypes.reserve(Count);
|
|
while (Count--) {
|
|
FunctionTypes.push_back(readVaruint32(Ptr));
|
|
}
|
|
if (Ptr != End)
|
|
return make_error<GenericBinaryError>("Function section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseTableSection(const uint8_t *Ptr, const uint8_t *End) {
|
|
uint32_t Count = readVaruint32(Ptr);
|
|
Tables.reserve(Count);
|
|
while (Count--) {
|
|
Tables.push_back(readTable(Ptr));
|
|
if (Tables.back().ElemType != wasm::WASM_TYPE_ANYFUNC) {
|
|
return make_error<GenericBinaryError>("Invalid table element type",
|
|
object_error::parse_failed);
|
|
}
|
|
}
|
|
if (Ptr != End)
|
|
return make_error<GenericBinaryError>("Table section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseMemorySection(const uint8_t *Ptr, const uint8_t *End) {
|
|
uint32_t Count = readVaruint32(Ptr);
|
|
Memories.reserve(Count);
|
|
while (Count--) {
|
|
Memories.push_back(readLimits(Ptr));
|
|
}
|
|
if (Ptr != End)
|
|
return make_error<GenericBinaryError>("Memory section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseGlobalSection(const uint8_t *Ptr, const uint8_t *End) {
|
|
uint32_t Count = readVaruint32(Ptr);
|
|
Globals.reserve(Count);
|
|
while (Count--) {
|
|
wasm::WasmGlobal Global;
|
|
Global.Type = readVarint7(Ptr);
|
|
Global.Mutable = readVaruint1(Ptr);
|
|
if (Error Err = readInitExpr(Global.InitExpr, Ptr))
|
|
return Err;
|
|
Globals.push_back(Global);
|
|
}
|
|
if (Ptr != End)
|
|
return make_error<GenericBinaryError>("Global section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseExportSection(const uint8_t *Ptr, const uint8_t *End) {
|
|
uint32_t Count = readVaruint32(Ptr);
|
|
Exports.reserve(Count);
|
|
for (uint32_t i = 0; i < Count; i++) {
|
|
wasm::WasmExport Ex;
|
|
Ex.Name = readString(Ptr);
|
|
Ex.Kind = readUint8(Ptr);
|
|
Ex.Index = readVaruint32(Ptr);
|
|
WasmSymbol::SymbolType ExportType;
|
|
bool MakeSymbol = false;
|
|
switch (Ex.Kind) {
|
|
case wasm::WASM_EXTERNAL_FUNCTION:
|
|
ExportType = WasmSymbol::SymbolType::FUNCTION_EXPORT;
|
|
MakeSymbol = true;
|
|
break;
|
|
case wasm::WASM_EXTERNAL_GLOBAL:
|
|
ExportType = WasmSymbol::SymbolType::GLOBAL_EXPORT;
|
|
MakeSymbol = true;
|
|
break;
|
|
case wasm::WASM_EXTERNAL_MEMORY:
|
|
case wasm::WASM_EXTERNAL_TABLE:
|
|
break;
|
|
default:
|
|
return make_error<GenericBinaryError>(
|
|
"Unexpected export kind", object_error::parse_failed);
|
|
}
|
|
if (MakeSymbol) {
|
|
auto Pair = SymbolMap.try_emplace(Ex.Name, Symbols.size());
|
|
if (Pair.second) {
|
|
Symbols.emplace_back(Ex.Name, ExportType,
|
|
Sections.size(), i);
|
|
DEBUG(dbgs() << "Adding export: " << Symbols.back()
|
|
<< " sym index:" << Symbols.size() << "\n");
|
|
} else {
|
|
uint32_t SymIndex = Pair.first->second;
|
|
Symbols[SymIndex] = WasmSymbol(Ex.Name, ExportType, Sections.size(), i);
|
|
DEBUG(dbgs() << "Replacing existing symbol: " << Symbols[SymIndex]
|
|
<< " sym index:" << SymIndex << "\n");
|
|
}
|
|
}
|
|
Exports.push_back(Ex);
|
|
}
|
|
if (Ptr != End)
|
|
return make_error<GenericBinaryError>("Export section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseStartSection(const uint8_t *Ptr, const uint8_t *End) {
|
|
StartFunction = readVaruint32(Ptr);
|
|
if (StartFunction >= FunctionTypes.size())
|
|
return make_error<GenericBinaryError>("Invalid start function",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseCodeSection(const uint8_t *Ptr, const uint8_t *End) {
|
|
uint32_t FunctionCount = readVaruint32(Ptr);
|
|
if (FunctionCount != FunctionTypes.size()) {
|
|
return make_error<GenericBinaryError>("Invalid function count",
|
|
object_error::parse_failed);
|
|
}
|
|
|
|
CodeSection = ArrayRef<uint8_t>(Ptr, End - Ptr);
|
|
|
|
while (FunctionCount--) {
|
|
wasm::WasmFunction Function;
|
|
uint32_t FunctionSize = readVaruint32(Ptr);
|
|
const uint8_t *FunctionEnd = Ptr + FunctionSize;
|
|
|
|
uint32_t NumLocalDecls = readVaruint32(Ptr);
|
|
Function.Locals.reserve(NumLocalDecls);
|
|
while (NumLocalDecls--) {
|
|
wasm::WasmLocalDecl Decl;
|
|
Decl.Count = readVaruint32(Ptr);
|
|
Decl.Type = readVarint7(Ptr);
|
|
Function.Locals.push_back(Decl);
|
|
}
|
|
|
|
uint32_t BodySize = FunctionEnd - Ptr;
|
|
Function.Body = ArrayRef<uint8_t>(Ptr, BodySize);
|
|
Ptr += BodySize;
|
|
assert(Ptr == FunctionEnd);
|
|
Functions.push_back(Function);
|
|
}
|
|
if (Ptr != End)
|
|
return make_error<GenericBinaryError>("Code section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseElemSection(const uint8_t *Ptr, const uint8_t *End) {
|
|
uint32_t Count = readVaruint32(Ptr);
|
|
ElemSegments.reserve(Count);
|
|
while (Count--) {
|
|
wasm::WasmElemSegment Segment;
|
|
Segment.TableIndex = readVaruint32(Ptr);
|
|
if (Segment.TableIndex != 0) {
|
|
return make_error<GenericBinaryError>("Invalid TableIndex",
|
|
object_error::parse_failed);
|
|
}
|
|
if (Error Err = readInitExpr(Segment.Offset, Ptr))
|
|
return Err;
|
|
uint32_t NumElems = readVaruint32(Ptr);
|
|
while (NumElems--) {
|
|
Segment.Functions.push_back(readVaruint32(Ptr));
|
|
}
|
|
ElemSegments.push_back(Segment);
|
|
}
|
|
if (Ptr != End)
|
|
return make_error<GenericBinaryError>("Elem section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseDataSection(const uint8_t *Ptr, const uint8_t *End) {
|
|
const uint8_t *Start = Ptr;
|
|
uint32_t Count = readVaruint32(Ptr);
|
|
DataSegments.reserve(Count);
|
|
while (Count--) {
|
|
WasmSegment Segment;
|
|
Segment.Data.MemoryIndex = readVaruint32(Ptr);
|
|
if (Error Err = readInitExpr(Segment.Data.Offset, Ptr))
|
|
return Err;
|
|
uint32_t Size = readVaruint32(Ptr);
|
|
Segment.Data.Content = ArrayRef<uint8_t>(Ptr, Size);
|
|
Segment.SectionOffset = Ptr - Start;
|
|
Ptr += Size;
|
|
DataSegments.push_back(Segment);
|
|
}
|
|
if (Ptr != End)
|
|
return make_error<GenericBinaryError>("Data section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
const uint8_t *WasmObjectFile::getPtr(size_t Offset) const {
|
|
return reinterpret_cast<const uint8_t *>(getData().substr(Offset, 1).data());
|
|
}
|
|
|
|
const wasm::WasmObjectHeader &WasmObjectFile::getHeader() const {
|
|
return Header;
|
|
}
|
|
|
|
void WasmObjectFile::moveSymbolNext(DataRefImpl &Symb) const { Symb.d.a++; }
|
|
|
|
uint32_t WasmObjectFile::getSymbolFlags(DataRefImpl Symb) const {
|
|
uint32_t Result = SymbolRef::SF_None;
|
|
const WasmSymbol &Sym = getWasmSymbol(Symb);
|
|
|
|
DEBUG(dbgs() << "getSymbolFlags: ptr=" << &Sym << " " << Sym << "\n");
|
|
if (Sym.Flags & wasm::WASM_SYMBOL_FLAG_WEAK)
|
|
Result |= SymbolRef::SF_Weak;
|
|
|
|
switch (Sym.Type) {
|
|
case WasmSymbol::SymbolType::FUNCTION_IMPORT:
|
|
Result |= SymbolRef::SF_Undefined | SymbolRef::SF_Executable;
|
|
break;
|
|
case WasmSymbol::SymbolType::FUNCTION_EXPORT:
|
|
Result |= SymbolRef::SF_Global | SymbolRef::SF_Executable;
|
|
break;
|
|
case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME:
|
|
Result |= SymbolRef::SF_Executable;
|
|
Result |= SymbolRef::SF_FormatSpecific;
|
|
break;
|
|
case WasmSymbol::SymbolType::GLOBAL_IMPORT:
|
|
Result |= SymbolRef::SF_Undefined;
|
|
break;
|
|
case WasmSymbol::SymbolType::GLOBAL_EXPORT:
|
|
Result |= SymbolRef::SF_Global;
|
|
break;
|
|
}
|
|
|
|
return Result;
|
|
}
|
|
|
|
basic_symbol_iterator WasmObjectFile::symbol_begin() const {
|
|
DataRefImpl Ref;
|
|
Ref.d.a = 0;
|
|
return BasicSymbolRef(Ref, this);
|
|
}
|
|
|
|
basic_symbol_iterator WasmObjectFile::symbol_end() const {
|
|
DataRefImpl Ref;
|
|
Ref.d.a = Symbols.size();
|
|
return BasicSymbolRef(Ref, this);
|
|
}
|
|
|
|
const WasmSymbol &WasmObjectFile::getWasmSymbol(const DataRefImpl &Symb) const {
|
|
return Symbols[Symb.d.a];
|
|
}
|
|
|
|
const WasmSymbol &WasmObjectFile::getWasmSymbol(const SymbolRef &Symb) const {
|
|
return getWasmSymbol(Symb.getRawDataRefImpl());
|
|
}
|
|
|
|
Expected<StringRef> WasmObjectFile::getSymbolName(DataRefImpl Symb) const {
|
|
return getWasmSymbol(Symb).Name;
|
|
}
|
|
|
|
Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const {
|
|
return getSymbolValue(Symb);
|
|
}
|
|
|
|
uint64_t WasmObjectFile::getSymbolValueImpl(DataRefImpl Symb) const {
|
|
const WasmSymbol& Sym = getWasmSymbol(Symb);
|
|
switch (Sym.Type) {
|
|
case WasmSymbol::SymbolType::FUNCTION_IMPORT:
|
|
case WasmSymbol::SymbolType::GLOBAL_IMPORT:
|
|
return 0;
|
|
case WasmSymbol::SymbolType::FUNCTION_EXPORT:
|
|
case WasmSymbol::SymbolType::GLOBAL_EXPORT:
|
|
return Exports[Sym.ElementIndex].Index;
|
|
case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME:
|
|
return Sym.ElementIndex;
|
|
}
|
|
llvm_unreachable("invalid symbol type");
|
|
}
|
|
|
|
uint32_t WasmObjectFile::getSymbolAlignment(DataRefImpl Symb) const {
|
|
llvm_unreachable("not yet implemented");
|
|
return 0;
|
|
}
|
|
|
|
uint64_t WasmObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const {
|
|
llvm_unreachable("not yet implemented");
|
|
return 0;
|
|
}
|
|
|
|
Expected<SymbolRef::Type>
|
|
WasmObjectFile::getSymbolType(DataRefImpl Symb) const {
|
|
const WasmSymbol &Sym = getWasmSymbol(Symb);
|
|
|
|
switch (Sym.Type) {
|
|
case WasmSymbol::SymbolType::FUNCTION_IMPORT:
|
|
case WasmSymbol::SymbolType::FUNCTION_EXPORT:
|
|
case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME:
|
|
return SymbolRef::ST_Function;
|
|
case WasmSymbol::SymbolType::GLOBAL_IMPORT:
|
|
case WasmSymbol::SymbolType::GLOBAL_EXPORT:
|
|
return SymbolRef::ST_Data;
|
|
}
|
|
|
|
llvm_unreachable("Unknown WasmSymbol::SymbolType");
|
|
return SymbolRef::ST_Other;
|
|
}
|
|
|
|
Expected<section_iterator>
|
|
WasmObjectFile::getSymbolSection(DataRefImpl Symb) const {
|
|
DataRefImpl Ref;
|
|
Ref.d.a = getWasmSymbol(Symb).Section;
|
|
return section_iterator(SectionRef(Ref, this));
|
|
}
|
|
|
|
void WasmObjectFile::moveSectionNext(DataRefImpl &Sec) const { Sec.d.a++; }
|
|
|
|
std::error_code WasmObjectFile::getSectionName(DataRefImpl Sec,
|
|
StringRef &Res) const {
|
|
const WasmSection &S = Sections[Sec.d.a];
|
|
#define ECase(X) \
|
|
case wasm::WASM_SEC_##X: \
|
|
Res = #X; \
|
|
break
|
|
switch (S.Type) {
|
|
ECase(TYPE);
|
|
ECase(IMPORT);
|
|
ECase(FUNCTION);
|
|
ECase(TABLE);
|
|
ECase(MEMORY);
|
|
ECase(GLOBAL);
|
|
ECase(EXPORT);
|
|
ECase(START);
|
|
ECase(ELEM);
|
|
ECase(CODE);
|
|
ECase(DATA);
|
|
case wasm::WASM_SEC_CUSTOM:
|
|
Res = S.Name;
|
|
break;
|
|
default:
|
|
return object_error::invalid_section_index;
|
|
}
|
|
#undef ECase
|
|
return std::error_code();
|
|
}
|
|
|
|
uint64_t WasmObjectFile::getSectionAddress(DataRefImpl Sec) const { return 0; }
|
|
|
|
uint64_t WasmObjectFile::getSectionIndex(DataRefImpl Sec) const {
|
|
return Sec.d.a;
|
|
}
|
|
|
|
uint64_t WasmObjectFile::getSectionSize(DataRefImpl Sec) const {
|
|
const WasmSection &S = Sections[Sec.d.a];
|
|
return S.Content.size();
|
|
}
|
|
|
|
std::error_code WasmObjectFile::getSectionContents(DataRefImpl Sec,
|
|
StringRef &Res) const {
|
|
const WasmSection &S = Sections[Sec.d.a];
|
|
// This will never fail since wasm sections can never be empty (user-sections
|
|
// must have a name and non-user sections each have a defined structure).
|
|
Res = StringRef(reinterpret_cast<const char *>(S.Content.data()),
|
|
S.Content.size());
|
|
return std::error_code();
|
|
}
|
|
|
|
uint64_t WasmObjectFile::getSectionAlignment(DataRefImpl Sec) const {
|
|
return 1;
|
|
}
|
|
|
|
bool WasmObjectFile::isSectionCompressed(DataRefImpl Sec) const {
|
|
return false;
|
|
}
|
|
|
|
bool WasmObjectFile::isSectionText(DataRefImpl Sec) const {
|
|
return getWasmSection(Sec).Type == wasm::WASM_SEC_CODE;
|
|
}
|
|
|
|
bool WasmObjectFile::isSectionData(DataRefImpl Sec) const {
|
|
return getWasmSection(Sec).Type == wasm::WASM_SEC_DATA;
|
|
}
|
|
|
|
bool WasmObjectFile::isSectionBSS(DataRefImpl Sec) const { return false; }
|
|
|
|
bool WasmObjectFile::isSectionVirtual(DataRefImpl Sec) const { return false; }
|
|
|
|
bool WasmObjectFile::isSectionBitcode(DataRefImpl Sec) const { return false; }
|
|
|
|
relocation_iterator WasmObjectFile::section_rel_begin(DataRefImpl Ref) const {
|
|
DataRefImpl RelocRef;
|
|
RelocRef.d.a = Ref.d.a;
|
|
RelocRef.d.b = 0;
|
|
return relocation_iterator(RelocationRef(RelocRef, this));
|
|
}
|
|
|
|
relocation_iterator WasmObjectFile::section_rel_end(DataRefImpl Ref) const {
|
|
const WasmSection &Sec = getWasmSection(Ref);
|
|
DataRefImpl RelocRef;
|
|
RelocRef.d.a = Ref.d.a;
|
|
RelocRef.d.b = Sec.Relocations.size();
|
|
return relocation_iterator(RelocationRef(RelocRef, this));
|
|
}
|
|
|
|
void WasmObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
|
|
Rel.d.b++;
|
|
}
|
|
|
|
uint64_t WasmObjectFile::getRelocationOffset(DataRefImpl Ref) const {
|
|
const wasm::WasmRelocation &Rel = getWasmRelocation(Ref);
|
|
return Rel.Offset;
|
|
}
|
|
|
|
symbol_iterator WasmObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
|
|
llvm_unreachable("not yet implemented");
|
|
SymbolRef Ref;
|
|
return symbol_iterator(Ref);
|
|
}
|
|
|
|
uint64_t WasmObjectFile::getRelocationType(DataRefImpl Ref) const {
|
|
const wasm::WasmRelocation &Rel = getWasmRelocation(Ref);
|
|
return Rel.Type;
|
|
}
|
|
|
|
void WasmObjectFile::getRelocationTypeName(
|
|
DataRefImpl Ref, SmallVectorImpl<char> &Result) const {
|
|
const wasm::WasmRelocation& Rel = getWasmRelocation(Ref);
|
|
StringRef Res = "Unknown";
|
|
|
|
#define WASM_RELOC(name, value) \
|
|
case wasm::name: \
|
|
Res = #name; \
|
|
break;
|
|
|
|
switch (Rel.Type) {
|
|
#include "llvm/BinaryFormat/WasmRelocs/WebAssembly.def"
|
|
}
|
|
|
|
#undef WASM_RELOC
|
|
|
|
Result.append(Res.begin(), Res.end());
|
|
}
|
|
|
|
section_iterator WasmObjectFile::section_begin() const {
|
|
DataRefImpl Ref;
|
|
Ref.d.a = 0;
|
|
return section_iterator(SectionRef(Ref, this));
|
|
}
|
|
|
|
section_iterator WasmObjectFile::section_end() const {
|
|
DataRefImpl Ref;
|
|
Ref.d.a = Sections.size();
|
|
return section_iterator(SectionRef(Ref, this));
|
|
}
|
|
|
|
uint8_t WasmObjectFile::getBytesInAddress() const { return 4; }
|
|
|
|
StringRef WasmObjectFile::getFileFormatName() const { return "WASM"; }
|
|
|
|
unsigned WasmObjectFile::getArch() const { return Triple::wasm32; }
|
|
|
|
SubtargetFeatures WasmObjectFile::getFeatures() const {
|
|
return SubtargetFeatures();
|
|
}
|
|
|
|
bool WasmObjectFile::isRelocatableObject() const {
|
|
return HasLinkingSection;
|
|
}
|
|
|
|
const WasmSection &WasmObjectFile::getWasmSection(DataRefImpl Ref) const {
|
|
assert(Ref.d.a < Sections.size());
|
|
return Sections[Ref.d.a];
|
|
}
|
|
|
|
const WasmSection &
|
|
WasmObjectFile::getWasmSection(const SectionRef &Section) const {
|
|
return getWasmSection(Section.getRawDataRefImpl());
|
|
}
|
|
|
|
const wasm::WasmRelocation &
|
|
WasmObjectFile::getWasmRelocation(const RelocationRef &Ref) const {
|
|
return getWasmRelocation(Ref.getRawDataRefImpl());
|
|
}
|
|
|
|
const wasm::WasmRelocation &
|
|
WasmObjectFile::getWasmRelocation(DataRefImpl Ref) const {
|
|
assert(Ref.d.a < Sections.size());
|
|
const WasmSection& Sec = Sections[Ref.d.a];
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assert(Ref.d.b < Sec.Relocations.size());
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return Sec.Relocations[Ref.d.b];
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}
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