forked from OSchip/llvm-project
1671 lines
58 KiB
C++
1671 lines
58 KiB
C++
//===- WasmObjectFile.cpp - Wasm object file implementation ---------------===//
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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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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallSet.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/StringSet.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 "llvm/Support/ScopedPrinter.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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void WasmSymbol::print(raw_ostream &Out) const {
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Out << "Name=" << Info.Name
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<< ", Kind=" << toString(wasm::WasmSymbolType(Info.Kind))
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<< ", Flags=" << Info.Flags;
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if (!isTypeData()) {
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Out << ", ElemIndex=" << Info.ElementIndex;
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} else if (isDefined()) {
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Out << ", Segment=" << Info.DataRef.Segment;
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Out << ", Offset=" << Info.DataRef.Offset;
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Out << ", Size=" << Info.DataRef.Size;
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}
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}
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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LLVM_DUMP_METHOD void WasmSymbol::dump() const { print(dbgs()); }
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#endif
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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 = std::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(WasmObjectFile::ReadContext &Ctx) {
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if (Ctx.Ptr == Ctx.End)
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report_fatal_error("EOF while reading uint8");
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return *Ctx.Ptr++;
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}
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static uint32_t readUint32(WasmObjectFile::ReadContext &Ctx) {
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if (Ctx.Ptr + 4 > Ctx.End)
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report_fatal_error("EOF while reading uint32");
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uint32_t Result = support::endian::read32le(Ctx.Ptr);
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Ctx.Ptr += 4;
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return Result;
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}
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static int32_t readFloat32(WasmObjectFile::ReadContext &Ctx) {
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if (Ctx.Ptr + 4 > Ctx.End)
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report_fatal_error("EOF while reading float64");
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int32_t Result = 0;
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memcpy(&Result, Ctx.Ptr, sizeof(Result));
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Ctx.Ptr += sizeof(Result);
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return Result;
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}
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static int64_t readFloat64(WasmObjectFile::ReadContext &Ctx) {
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if (Ctx.Ptr + 8 > Ctx.End)
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report_fatal_error("EOF while reading float64");
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int64_t Result = 0;
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memcpy(&Result, Ctx.Ptr, sizeof(Result));
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Ctx.Ptr += sizeof(Result);
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return Result;
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}
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static uint64_t readULEB128(WasmObjectFile::ReadContext &Ctx) {
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unsigned Count;
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const char *Error = nullptr;
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uint64_t Result = decodeULEB128(Ctx.Ptr, &Count, Ctx.End, &Error);
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if (Error)
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report_fatal_error(Error);
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Ctx.Ptr += Count;
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return Result;
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}
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static StringRef readString(WasmObjectFile::ReadContext &Ctx) {
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uint32_t StringLen = readULEB128(Ctx);
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if (Ctx.Ptr + StringLen > Ctx.End)
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report_fatal_error("EOF while reading string");
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StringRef Return =
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StringRef(reinterpret_cast<const char *>(Ctx.Ptr), StringLen);
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Ctx.Ptr += StringLen;
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return Return;
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}
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static int64_t readLEB128(WasmObjectFile::ReadContext &Ctx) {
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unsigned Count;
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const char *Error = nullptr;
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uint64_t Result = decodeSLEB128(Ctx.Ptr, &Count, Ctx.End, &Error);
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if (Error)
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report_fatal_error(Error);
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Ctx.Ptr += Count;
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return Result;
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}
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static uint8_t readVaruint1(WasmObjectFile::ReadContext &Ctx) {
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int64_t Result = readLEB128(Ctx);
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if (Result > VARUINT1_MAX || Result < 0)
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report_fatal_error("LEB is outside Varuint1 range");
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return Result;
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}
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static int32_t readVarint32(WasmObjectFile::ReadContext &Ctx) {
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int64_t Result = readLEB128(Ctx);
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if (Result > INT32_MAX || Result < INT32_MIN)
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report_fatal_error("LEB is outside Varint32 range");
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return Result;
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}
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static uint32_t readVaruint32(WasmObjectFile::ReadContext &Ctx) {
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uint64_t Result = readULEB128(Ctx);
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if (Result > UINT32_MAX)
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report_fatal_error("LEB is outside Varuint32 range");
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return Result;
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}
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static int64_t readVarint64(WasmObjectFile::ReadContext &Ctx) {
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return readLEB128(Ctx);
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}
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static uint8_t readOpcode(WasmObjectFile::ReadContext &Ctx) {
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return readUint8(Ctx);
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}
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static Error readInitExpr(wasm::WasmInitExpr &Expr,
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WasmObjectFile::ReadContext &Ctx) {
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Expr.Opcode = readOpcode(Ctx);
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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(Ctx);
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break;
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case wasm::WASM_OPCODE_I64_CONST:
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Expr.Value.Int64 = readVarint64(Ctx);
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break;
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case wasm::WASM_OPCODE_F32_CONST:
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Expr.Value.Float32 = readFloat32(Ctx);
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break;
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case wasm::WASM_OPCODE_F64_CONST:
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Expr.Value.Float64 = readFloat64(Ctx);
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break;
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case wasm::WASM_OPCODE_GLOBAL_GET:
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Expr.Value.Global = readULEB128(Ctx);
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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(Ctx);
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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(WasmObjectFile::ReadContext &Ctx) {
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wasm::WasmLimits Result;
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Result.Flags = readVaruint32(Ctx);
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Result.Initial = readVaruint32(Ctx);
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if (Result.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX)
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Result.Maximum = readVaruint32(Ctx);
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return Result;
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}
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static wasm::WasmTable readTable(WasmObjectFile::ReadContext &Ctx) {
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wasm::WasmTable Table;
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Table.ElemType = readUint8(Ctx);
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Table.Limits = readLimits(Ctx);
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return Table;
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}
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static Error readSection(WasmSection &Section, WasmObjectFile::ReadContext &Ctx,
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WasmSectionOrderChecker &Checker) {
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Section.Offset = Ctx.Ptr - Ctx.Start;
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Section.Type = readUint8(Ctx);
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LLVM_DEBUG(dbgs() << "readSection type=" << Section.Type << "\n");
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uint32_t Size = readVaruint32(Ctx);
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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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if (Ctx.Ptr + Size > Ctx.End)
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return make_error<StringError>("Section too large",
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object_error::parse_failed);
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if (Section.Type == wasm::WASM_SEC_CUSTOM) {
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WasmObjectFile::ReadContext SectionCtx;
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SectionCtx.Start = Ctx.Ptr;
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SectionCtx.Ptr = Ctx.Ptr;
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SectionCtx.End = Ctx.Ptr + Size;
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Section.Name = readString(SectionCtx);
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uint32_t SectionNameSize = SectionCtx.Ptr - SectionCtx.Start;
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Ctx.Ptr += SectionNameSize;
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Size -= SectionNameSize;
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}
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if (!Checker.isValidSectionOrder(Section.Type, Section.Name)) {
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return make_error<StringError>("Out of order section type: " +
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llvm::to_string(Section.Type),
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object_error::parse_failed);
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}
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Section.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size);
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Ctx.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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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 =
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make_error<StringError>("Bad magic number", object_error::parse_failed);
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return;
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}
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ReadContext Ctx;
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Ctx.Start = getData().bytes_begin();
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Ctx.Ptr = Ctx.Start + 4;
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Ctx.End = Ctx.Start + getData().size();
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if (Ctx.Ptr + 4 > Ctx.End) {
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Err = make_error<StringError>("Missing version number",
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object_error::parse_failed);
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return;
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}
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Header.Version = readUint32(Ctx);
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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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WasmSection Sec;
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WasmSectionOrderChecker Checker;
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while (Ctx.Ptr < Ctx.End) {
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if ((Err = readSection(Sec, Ctx, Checker)))
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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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ReadContext Ctx;
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Ctx.Start = Sec.Content.data();
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Ctx.End = Ctx.Start + Sec.Content.size();
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Ctx.Ptr = Ctx.Start;
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switch (Sec.Type) {
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case wasm::WASM_SEC_CUSTOM:
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return parseCustomSection(Sec, Ctx);
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case wasm::WASM_SEC_TYPE:
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return parseTypeSection(Ctx);
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case wasm::WASM_SEC_IMPORT:
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return parseImportSection(Ctx);
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case wasm::WASM_SEC_FUNCTION:
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return parseFunctionSection(Ctx);
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case wasm::WASM_SEC_TABLE:
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return parseTableSection(Ctx);
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case wasm::WASM_SEC_MEMORY:
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return parseMemorySection(Ctx);
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case wasm::WASM_SEC_GLOBAL:
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return parseGlobalSection(Ctx);
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case wasm::WASM_SEC_EVENT:
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return parseEventSection(Ctx);
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case wasm::WASM_SEC_EXPORT:
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return parseExportSection(Ctx);
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case wasm::WASM_SEC_START:
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return parseStartSection(Ctx);
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case wasm::WASM_SEC_ELEM:
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return parseElemSection(Ctx);
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case wasm::WASM_SEC_CODE:
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return parseCodeSection(Ctx);
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case wasm::WASM_SEC_DATA:
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return parseDataSection(Ctx);
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case wasm::WASM_SEC_DATACOUNT:
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return parseDataCountSection(Ctx);
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default:
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return make_error<GenericBinaryError>(
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"Invalid section type: " + Twine(Sec.Type), object_error::parse_failed);
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}
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}
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Error WasmObjectFile::parseDylinkSection(ReadContext &Ctx) {
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// See https://github.com/WebAssembly/tool-conventions/blob/master/DynamicLinking.md
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HasDylinkSection = true;
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DylinkInfo.MemorySize = readVaruint32(Ctx);
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DylinkInfo.MemoryAlignment = readVaruint32(Ctx);
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DylinkInfo.TableSize = readVaruint32(Ctx);
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DylinkInfo.TableAlignment = readVaruint32(Ctx);
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uint32_t Count = readVaruint32(Ctx);
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while (Count--) {
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DylinkInfo.Needed.push_back(readString(Ctx));
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}
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if (Ctx.Ptr != Ctx.End)
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return make_error<GenericBinaryError>("dylink 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::parseNameSection(ReadContext &Ctx) {
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llvm::DenseSet<uint64_t> Seen;
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if (Functions.size() != FunctionTypes.size()) {
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return make_error<GenericBinaryError>("Names must come after code section",
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object_error::parse_failed);
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}
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while (Ctx.Ptr < Ctx.End) {
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uint8_t Type = readUint8(Ctx);
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uint32_t Size = readVaruint32(Ctx);
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const uint8_t *SubSectionEnd = Ctx.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(Ctx);
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while (Count--) {
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uint32_t Index = readVaruint32(Ctx);
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if (!Seen.insert(Index).second)
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return make_error<GenericBinaryError>("Function named more than once",
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object_error::parse_failed);
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StringRef Name = readString(Ctx);
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if (!isValidFunctionIndex(Index) || Name.empty())
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return make_error<GenericBinaryError>("Invalid name entry",
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object_error::parse_failed);
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DebugNames.push_back(wasm::WasmFunctionName{Index, Name});
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if (isDefinedFunctionIndex(Index))
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getDefinedFunction(Index).DebugName = Name;
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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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Ctx.Ptr += Size;
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break;
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}
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if (Ctx.Ptr != SubSectionEnd)
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return make_error<GenericBinaryError>(
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"Name sub-section ended prematurely", object_error::parse_failed);
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}
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if (Ctx.Ptr != Ctx.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(ReadContext &Ctx) {
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HasLinkingSection = true;
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if (Functions.size() != FunctionTypes.size()) {
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return make_error<GenericBinaryError>(
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"Linking data must come after code section",
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object_error::parse_failed);
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}
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LinkingData.Version = readVaruint32(Ctx);
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if (LinkingData.Version != wasm::WasmMetadataVersion) {
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return make_error<GenericBinaryError>(
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"Unexpected metadata version: " + Twine(LinkingData.Version) +
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" (Expected: " + Twine(wasm::WasmMetadataVersion) + ")",
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object_error::parse_failed);
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}
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const uint8_t *OrigEnd = Ctx.End;
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while (Ctx.Ptr < OrigEnd) {
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Ctx.End = OrigEnd;
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uint8_t Type = readUint8(Ctx);
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uint32_t Size = readVaruint32(Ctx);
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LLVM_DEBUG(dbgs() << "readSubsection type=" << int(Type) << " size=" << Size
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<< "\n");
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Ctx.End = Ctx.Ptr + Size;
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switch (Type) {
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case wasm::WASM_SYMBOL_TABLE:
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if (Error Err = parseLinkingSectionSymtab(Ctx))
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return Err;
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break;
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case wasm::WASM_SEGMENT_INFO: {
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uint32_t Count = readVaruint32(Ctx);
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if (Count > DataSegments.size())
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return make_error<GenericBinaryError>("Too many segment names",
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object_error::parse_failed);
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for (uint32_t I = 0; I < Count; I++) {
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DataSegments[I].Data.Name = readString(Ctx);
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DataSegments[I].Data.Alignment = readVaruint32(Ctx);
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DataSegments[I].Data.LinkerFlags = readVaruint32(Ctx);
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}
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break;
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}
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case wasm::WASM_INIT_FUNCS: {
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uint32_t Count = readVaruint32(Ctx);
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LinkingData.InitFunctions.reserve(Count);
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for (uint32_t I = 0; I < Count; I++) {
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wasm::WasmInitFunc Init;
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Init.Priority = readVaruint32(Ctx);
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Init.Symbol = readVaruint32(Ctx);
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if (!isValidFunctionSymbol(Init.Symbol))
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return make_error<GenericBinaryError>("Invalid function symbol: " +
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Twine(Init.Symbol),
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object_error::parse_failed);
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LinkingData.InitFunctions.emplace_back(Init);
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}
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break;
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}
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case wasm::WASM_COMDAT_INFO:
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if (Error Err = parseLinkingSectionComdat(Ctx))
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return Err;
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break;
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default:
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Ctx.Ptr += Size;
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break;
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}
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if (Ctx.Ptr != Ctx.End)
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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 (Ctx.Ptr != OrigEnd)
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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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Error WasmObjectFile::parseLinkingSectionSymtab(ReadContext &Ctx) {
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uint32_t Count = readVaruint32(Ctx);
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LinkingData.SymbolTable.reserve(Count);
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Symbols.reserve(Count);
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StringSet<> SymbolNames;
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std::vector<wasm::WasmImport *> ImportedGlobals;
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std::vector<wasm::WasmImport *> ImportedFunctions;
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std::vector<wasm::WasmImport *> ImportedEvents;
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ImportedGlobals.reserve(Imports.size());
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ImportedFunctions.reserve(Imports.size());
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ImportedEvents.reserve(Imports.size());
|
|
for (auto &I : Imports) {
|
|
if (I.Kind == wasm::WASM_EXTERNAL_FUNCTION)
|
|
ImportedFunctions.emplace_back(&I);
|
|
else if (I.Kind == wasm::WASM_EXTERNAL_GLOBAL)
|
|
ImportedGlobals.emplace_back(&I);
|
|
else if (I.Kind == wasm::WASM_EXTERNAL_EVENT)
|
|
ImportedEvents.emplace_back(&I);
|
|
}
|
|
|
|
while (Count--) {
|
|
wasm::WasmSymbolInfo Info;
|
|
const wasm::WasmSignature *Signature = nullptr;
|
|
const wasm::WasmGlobalType *GlobalType = nullptr;
|
|
const wasm::WasmEventType *EventType = nullptr;
|
|
|
|
Info.Kind = readUint8(Ctx);
|
|
Info.Flags = readVaruint32(Ctx);
|
|
bool IsDefined = (Info.Flags & wasm::WASM_SYMBOL_UNDEFINED) == 0;
|
|
|
|
switch (Info.Kind) {
|
|
case wasm::WASM_SYMBOL_TYPE_FUNCTION:
|
|
Info.ElementIndex = readVaruint32(Ctx);
|
|
if (!isValidFunctionIndex(Info.ElementIndex) ||
|
|
IsDefined != isDefinedFunctionIndex(Info.ElementIndex))
|
|
return make_error<GenericBinaryError>("invalid function symbol index",
|
|
object_error::parse_failed);
|
|
if (IsDefined) {
|
|
Info.Name = readString(Ctx);
|
|
unsigned FuncIndex = Info.ElementIndex - NumImportedFunctions;
|
|
Signature = &Signatures[FunctionTypes[FuncIndex]];
|
|
wasm::WasmFunction &Function = Functions[FuncIndex];
|
|
if (Function.SymbolName.empty())
|
|
Function.SymbolName = Info.Name;
|
|
} else {
|
|
wasm::WasmImport &Import = *ImportedFunctions[Info.ElementIndex];
|
|
if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0)
|
|
Info.Name = readString(Ctx);
|
|
else
|
|
Info.Name = Import.Field;
|
|
Signature = &Signatures[Import.SigIndex];
|
|
Info.ImportName = Import.Field;
|
|
Info.ImportModule = Import.Module;
|
|
}
|
|
break;
|
|
|
|
case wasm::WASM_SYMBOL_TYPE_GLOBAL:
|
|
Info.ElementIndex = readVaruint32(Ctx);
|
|
if (!isValidGlobalIndex(Info.ElementIndex) ||
|
|
IsDefined != isDefinedGlobalIndex(Info.ElementIndex))
|
|
return make_error<GenericBinaryError>("invalid global symbol index",
|
|
object_error::parse_failed);
|
|
if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) ==
|
|
wasm::WASM_SYMBOL_BINDING_WEAK)
|
|
return make_error<GenericBinaryError>("undefined weak global symbol",
|
|
object_error::parse_failed);
|
|
if (IsDefined) {
|
|
Info.Name = readString(Ctx);
|
|
unsigned GlobalIndex = Info.ElementIndex - NumImportedGlobals;
|
|
wasm::WasmGlobal &Global = Globals[GlobalIndex];
|
|
GlobalType = &Global.Type;
|
|
if (Global.SymbolName.empty())
|
|
Global.SymbolName = Info.Name;
|
|
} else {
|
|
wasm::WasmImport &Import = *ImportedGlobals[Info.ElementIndex];
|
|
if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0)
|
|
Info.Name = readString(Ctx);
|
|
else
|
|
Info.Name = Import.Field;
|
|
GlobalType = &Import.Global;
|
|
Info.ImportName = Import.Field;
|
|
Info.ImportModule = Import.Module;
|
|
}
|
|
break;
|
|
|
|
case wasm::WASM_SYMBOL_TYPE_DATA:
|
|
Info.Name = readString(Ctx);
|
|
if (IsDefined) {
|
|
uint32_t Index = readVaruint32(Ctx);
|
|
if (Index >= DataSegments.size())
|
|
return make_error<GenericBinaryError>("invalid data symbol index",
|
|
object_error::parse_failed);
|
|
uint32_t Offset = readVaruint32(Ctx);
|
|
uint32_t Size = readVaruint32(Ctx);
|
|
if (Offset + Size > DataSegments[Index].Data.Content.size())
|
|
return make_error<GenericBinaryError>("invalid data symbol offset",
|
|
object_error::parse_failed);
|
|
Info.DataRef = wasm::WasmDataReference{Index, Offset, Size};
|
|
}
|
|
break;
|
|
|
|
case wasm::WASM_SYMBOL_TYPE_SECTION: {
|
|
if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) !=
|
|
wasm::WASM_SYMBOL_BINDING_LOCAL)
|
|
return make_error<GenericBinaryError>(
|
|
"Section symbols must have local binding",
|
|
object_error::parse_failed);
|
|
Info.ElementIndex = readVaruint32(Ctx);
|
|
// Use somewhat unique section name as symbol name.
|
|
StringRef SectionName = Sections[Info.ElementIndex].Name;
|
|
Info.Name = SectionName;
|
|
break;
|
|
}
|
|
|
|
case wasm::WASM_SYMBOL_TYPE_EVENT: {
|
|
Info.ElementIndex = readVaruint32(Ctx);
|
|
if (!isValidEventIndex(Info.ElementIndex) ||
|
|
IsDefined != isDefinedEventIndex(Info.ElementIndex))
|
|
return make_error<GenericBinaryError>("invalid event symbol index",
|
|
object_error::parse_failed);
|
|
if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) ==
|
|
wasm::WASM_SYMBOL_BINDING_WEAK)
|
|
return make_error<GenericBinaryError>("undefined weak global symbol",
|
|
object_error::parse_failed);
|
|
if (IsDefined) {
|
|
Info.Name = readString(Ctx);
|
|
unsigned EventIndex = Info.ElementIndex - NumImportedEvents;
|
|
wasm::WasmEvent &Event = Events[EventIndex];
|
|
Signature = &Signatures[Event.Type.SigIndex];
|
|
EventType = &Event.Type;
|
|
if (Event.SymbolName.empty())
|
|
Event.SymbolName = Info.Name;
|
|
|
|
} else {
|
|
wasm::WasmImport &Import = *ImportedEvents[Info.ElementIndex];
|
|
if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0)
|
|
Info.Name = readString(Ctx);
|
|
else
|
|
Info.Name = Import.Field;
|
|
EventType = &Import.Event;
|
|
Signature = &Signatures[EventType->SigIndex];
|
|
Info.ImportName = Import.Field;
|
|
Info.ImportModule = Import.Module;
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
return make_error<GenericBinaryError>("Invalid symbol type",
|
|
object_error::parse_failed);
|
|
}
|
|
|
|
if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) !=
|
|
wasm::WASM_SYMBOL_BINDING_LOCAL &&
|
|
!SymbolNames.insert(Info.Name).second)
|
|
return make_error<GenericBinaryError>("Duplicate symbol name " +
|
|
Twine(Info.Name),
|
|
object_error::parse_failed);
|
|
LinkingData.SymbolTable.emplace_back(Info);
|
|
Symbols.emplace_back(LinkingData.SymbolTable.back(), GlobalType, EventType,
|
|
Signature);
|
|
LLVM_DEBUG(dbgs() << "Adding symbol: " << Symbols.back() << "\n");
|
|
}
|
|
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseLinkingSectionComdat(ReadContext &Ctx) {
|
|
uint32_t ComdatCount = readVaruint32(Ctx);
|
|
StringSet<> ComdatSet;
|
|
for (unsigned ComdatIndex = 0; ComdatIndex < ComdatCount; ++ComdatIndex) {
|
|
StringRef Name = readString(Ctx);
|
|
if (Name.empty() || !ComdatSet.insert(Name).second)
|
|
return make_error<GenericBinaryError>("Bad/duplicate COMDAT name " +
|
|
Twine(Name),
|
|
object_error::parse_failed);
|
|
LinkingData.Comdats.emplace_back(Name);
|
|
uint32_t Flags = readVaruint32(Ctx);
|
|
if (Flags != 0)
|
|
return make_error<GenericBinaryError>("Unsupported COMDAT flags",
|
|
object_error::parse_failed);
|
|
|
|
uint32_t EntryCount = readVaruint32(Ctx);
|
|
while (EntryCount--) {
|
|
unsigned Kind = readVaruint32(Ctx);
|
|
unsigned Index = readVaruint32(Ctx);
|
|
switch (Kind) {
|
|
default:
|
|
return make_error<GenericBinaryError>("Invalid COMDAT entry type",
|
|
object_error::parse_failed);
|
|
case wasm::WASM_COMDAT_DATA:
|
|
if (Index >= DataSegments.size())
|
|
return make_error<GenericBinaryError>(
|
|
"COMDAT data index out of range", object_error::parse_failed);
|
|
if (DataSegments[Index].Data.Comdat != UINT32_MAX)
|
|
return make_error<GenericBinaryError>("Data segment in two COMDATs",
|
|
object_error::parse_failed);
|
|
DataSegments[Index].Data.Comdat = ComdatIndex;
|
|
break;
|
|
case wasm::WASM_COMDAT_FUNCTION:
|
|
if (!isDefinedFunctionIndex(Index))
|
|
return make_error<GenericBinaryError>(
|
|
"COMDAT function index out of range", object_error::parse_failed);
|
|
if (getDefinedFunction(Index).Comdat != UINT32_MAX)
|
|
return make_error<GenericBinaryError>("Function in two COMDATs",
|
|
object_error::parse_failed);
|
|
getDefinedFunction(Index).Comdat = ComdatIndex;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseProducersSection(ReadContext &Ctx) {
|
|
llvm::SmallSet<StringRef, 3> FieldsSeen;
|
|
uint32_t Fields = readVaruint32(Ctx);
|
|
for (size_t I = 0; I < Fields; ++I) {
|
|
StringRef FieldName = readString(Ctx);
|
|
if (!FieldsSeen.insert(FieldName).second)
|
|
return make_error<GenericBinaryError>(
|
|
"Producers section does not have unique fields",
|
|
object_error::parse_failed);
|
|
std::vector<std::pair<std::string, std::string>> *ProducerVec = nullptr;
|
|
if (FieldName == "language") {
|
|
ProducerVec = &ProducerInfo.Languages;
|
|
} else if (FieldName == "processed-by") {
|
|
ProducerVec = &ProducerInfo.Tools;
|
|
} else if (FieldName == "sdk") {
|
|
ProducerVec = &ProducerInfo.SDKs;
|
|
} else {
|
|
return make_error<GenericBinaryError>(
|
|
"Producers section field is not named one of language, processed-by, "
|
|
"or sdk",
|
|
object_error::parse_failed);
|
|
}
|
|
uint32_t ValueCount = readVaruint32(Ctx);
|
|
llvm::SmallSet<StringRef, 8> ProducersSeen;
|
|
for (size_t J = 0; J < ValueCount; ++J) {
|
|
StringRef Name = readString(Ctx);
|
|
StringRef Version = readString(Ctx);
|
|
if (!ProducersSeen.insert(Name).second) {
|
|
return make_error<GenericBinaryError>(
|
|
"Producers section contains repeated producer",
|
|
object_error::parse_failed);
|
|
}
|
|
ProducerVec->emplace_back(Name, Version);
|
|
}
|
|
}
|
|
if (Ctx.Ptr != Ctx.End)
|
|
return make_error<GenericBinaryError>("Producers section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseTargetFeaturesSection(ReadContext &Ctx) {
|
|
llvm::SmallSet<std::string, 8> FeaturesSeen;
|
|
uint32_t FeatureCount = readVaruint32(Ctx);
|
|
for (size_t I = 0; I < FeatureCount; ++I) {
|
|
wasm::WasmFeatureEntry Feature;
|
|
Feature.Prefix = readUint8(Ctx);
|
|
switch (Feature.Prefix) {
|
|
case wasm::WASM_FEATURE_PREFIX_USED:
|
|
case wasm::WASM_FEATURE_PREFIX_REQUIRED:
|
|
case wasm::WASM_FEATURE_PREFIX_DISALLOWED:
|
|
break;
|
|
default:
|
|
return make_error<GenericBinaryError>("Unknown feature policy prefix",
|
|
object_error::parse_failed);
|
|
}
|
|
Feature.Name = readString(Ctx);
|
|
if (!FeaturesSeen.insert(Feature.Name).second)
|
|
return make_error<GenericBinaryError>(
|
|
"Target features section contains repeated feature \"" +
|
|
Feature.Name + "\"",
|
|
object_error::parse_failed);
|
|
TargetFeatures.push_back(Feature);
|
|
}
|
|
if (Ctx.Ptr != Ctx.End)
|
|
return make_error<GenericBinaryError>(
|
|
"Target features section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseRelocSection(StringRef Name, ReadContext &Ctx) {
|
|
uint32_t SectionIndex = readVaruint32(Ctx);
|
|
if (SectionIndex >= Sections.size())
|
|
return make_error<GenericBinaryError>("Invalid section index",
|
|
object_error::parse_failed);
|
|
WasmSection &Section = Sections[SectionIndex];
|
|
uint32_t RelocCount = readVaruint32(Ctx);
|
|
uint32_t EndOffset = Section.Content.size();
|
|
uint32_t PreviousOffset = 0;
|
|
while (RelocCount--) {
|
|
wasm::WasmRelocation Reloc = {};
|
|
Reloc.Type = readVaruint32(Ctx);
|
|
Reloc.Offset = readVaruint32(Ctx);
|
|
if (Reloc.Offset < PreviousOffset)
|
|
return make_error<GenericBinaryError>("Relocations not in offset order",
|
|
object_error::parse_failed);
|
|
PreviousOffset = Reloc.Offset;
|
|
Reloc.Index = readVaruint32(Ctx);
|
|
switch (Reloc.Type) {
|
|
case wasm::R_WASM_FUNCTION_INDEX_LEB:
|
|
case wasm::R_WASM_TABLE_INDEX_SLEB:
|
|
case wasm::R_WASM_TABLE_INDEX_I32:
|
|
case wasm::R_WASM_TABLE_INDEX_REL_SLEB:
|
|
if (!isValidFunctionSymbol(Reloc.Index))
|
|
return make_error<GenericBinaryError>("Bad relocation function index",
|
|
object_error::parse_failed);
|
|
break;
|
|
case wasm::R_WASM_TYPE_INDEX_LEB:
|
|
if (Reloc.Index >= Signatures.size())
|
|
return make_error<GenericBinaryError>("Bad relocation type index",
|
|
object_error::parse_failed);
|
|
break;
|
|
case wasm::R_WASM_GLOBAL_INDEX_LEB:
|
|
// R_WASM_GLOBAL_INDEX_LEB are can be used against function and data
|
|
// symbols to refer to their GOT entries.
|
|
if (!isValidGlobalSymbol(Reloc.Index) &&
|
|
!isValidDataSymbol(Reloc.Index) &&
|
|
!isValidFunctionSymbol(Reloc.Index))
|
|
return make_error<GenericBinaryError>("Bad relocation global index",
|
|
object_error::parse_failed);
|
|
break;
|
|
case wasm::R_WASM_EVENT_INDEX_LEB:
|
|
if (!isValidEventSymbol(Reloc.Index))
|
|
return make_error<GenericBinaryError>("Bad relocation event index",
|
|
object_error::parse_failed);
|
|
break;
|
|
case wasm::R_WASM_MEMORY_ADDR_LEB:
|
|
case wasm::R_WASM_MEMORY_ADDR_SLEB:
|
|
case wasm::R_WASM_MEMORY_ADDR_I32:
|
|
case wasm::R_WASM_MEMORY_ADDR_REL_SLEB:
|
|
if (!isValidDataSymbol(Reloc.Index))
|
|
return make_error<GenericBinaryError>("Bad relocation data index",
|
|
object_error::parse_failed);
|
|
Reloc.Addend = readVarint32(Ctx);
|
|
break;
|
|
case wasm::R_WASM_FUNCTION_OFFSET_I32:
|
|
if (!isValidFunctionSymbol(Reloc.Index))
|
|
return make_error<GenericBinaryError>("Bad relocation function index",
|
|
object_error::parse_failed);
|
|
Reloc.Addend = readVarint32(Ctx);
|
|
break;
|
|
case wasm::R_WASM_SECTION_OFFSET_I32:
|
|
if (!isValidSectionSymbol(Reloc.Index))
|
|
return make_error<GenericBinaryError>("Bad relocation section index",
|
|
object_error::parse_failed);
|
|
Reloc.Addend = readVarint32(Ctx);
|
|
break;
|
|
default:
|
|
return make_error<GenericBinaryError>("Bad relocation type: " +
|
|
Twine(Reloc.Type),
|
|
object_error::parse_failed);
|
|
}
|
|
|
|
// Relocations must fit inside the section, and must appear in order. They
|
|
// also shouldn't overlap a function/element boundary, but we don't bother
|
|
// to check that.
|
|
uint64_t Size = 5;
|
|
if (Reloc.Type == wasm::R_WASM_TABLE_INDEX_I32 ||
|
|
Reloc.Type == wasm::R_WASM_MEMORY_ADDR_I32 ||
|
|
Reloc.Type == wasm::R_WASM_SECTION_OFFSET_I32 ||
|
|
Reloc.Type == wasm::R_WASM_FUNCTION_OFFSET_I32)
|
|
Size = 4;
|
|
if (Reloc.Offset + Size > EndOffset)
|
|
return make_error<GenericBinaryError>("Bad relocation offset",
|
|
object_error::parse_failed);
|
|
|
|
Section.Relocations.push_back(Reloc);
|
|
}
|
|
if (Ctx.Ptr != Ctx.End)
|
|
return make_error<GenericBinaryError>("Reloc section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseCustomSection(WasmSection &Sec, ReadContext &Ctx) {
|
|
if (Sec.Name == "dylink") {
|
|
if (Error Err = parseDylinkSection(Ctx))
|
|
return Err;
|
|
} else if (Sec.Name == "name") {
|
|
if (Error Err = parseNameSection(Ctx))
|
|
return Err;
|
|
} else if (Sec.Name == "linking") {
|
|
if (Error Err = parseLinkingSection(Ctx))
|
|
return Err;
|
|
} else if (Sec.Name == "producers") {
|
|
if (Error Err = parseProducersSection(Ctx))
|
|
return Err;
|
|
} else if (Sec.Name == "target_features") {
|
|
if (Error Err = parseTargetFeaturesSection(Ctx))
|
|
return Err;
|
|
} else if (Sec.Name.startswith("reloc.")) {
|
|
if (Error Err = parseRelocSection(Sec.Name, Ctx))
|
|
return Err;
|
|
}
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseTypeSection(ReadContext &Ctx) {
|
|
uint32_t Count = readVaruint32(Ctx);
|
|
Signatures.reserve(Count);
|
|
while (Count--) {
|
|
wasm::WasmSignature Sig;
|
|
uint8_t Form = readUint8(Ctx);
|
|
if (Form != wasm::WASM_TYPE_FUNC) {
|
|
return make_error<GenericBinaryError>("Invalid signature type",
|
|
object_error::parse_failed);
|
|
}
|
|
uint32_t ParamCount = readVaruint32(Ctx);
|
|
Sig.Params.reserve(ParamCount);
|
|
while (ParamCount--) {
|
|
uint32_t ParamType = readUint8(Ctx);
|
|
Sig.Params.push_back(wasm::ValType(ParamType));
|
|
}
|
|
uint32_t ReturnCount = readVaruint32(Ctx);
|
|
while (ReturnCount--) {
|
|
uint32_t ReturnType = readUint8(Ctx);
|
|
Sig.Returns.push_back(wasm::ValType(ReturnType));
|
|
}
|
|
Signatures.push_back(std::move(Sig));
|
|
}
|
|
if (Ctx.Ptr != Ctx.End)
|
|
return make_error<GenericBinaryError>("Type section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseImportSection(ReadContext &Ctx) {
|
|
uint32_t Count = readVaruint32(Ctx);
|
|
Imports.reserve(Count);
|
|
for (uint32_t I = 0; I < Count; I++) {
|
|
wasm::WasmImport Im;
|
|
Im.Module = readString(Ctx);
|
|
Im.Field = readString(Ctx);
|
|
Im.Kind = readUint8(Ctx);
|
|
switch (Im.Kind) {
|
|
case wasm::WASM_EXTERNAL_FUNCTION:
|
|
NumImportedFunctions++;
|
|
Im.SigIndex = readVaruint32(Ctx);
|
|
break;
|
|
case wasm::WASM_EXTERNAL_GLOBAL:
|
|
NumImportedGlobals++;
|
|
Im.Global.Type = readUint8(Ctx);
|
|
Im.Global.Mutable = readVaruint1(Ctx);
|
|
break;
|
|
case wasm::WASM_EXTERNAL_MEMORY:
|
|
Im.Memory = readLimits(Ctx);
|
|
break;
|
|
case wasm::WASM_EXTERNAL_TABLE:
|
|
Im.Table = readTable(Ctx);
|
|
if (Im.Table.ElemType != wasm::WASM_TYPE_FUNCREF)
|
|
return make_error<GenericBinaryError>("Invalid table element type",
|
|
object_error::parse_failed);
|
|
break;
|
|
case wasm::WASM_EXTERNAL_EVENT:
|
|
NumImportedEvents++;
|
|
Im.Event.Attribute = readVarint32(Ctx);
|
|
Im.Event.SigIndex = readVarint32(Ctx);
|
|
break;
|
|
default:
|
|
return make_error<GenericBinaryError>("Unexpected import kind",
|
|
object_error::parse_failed);
|
|
}
|
|
Imports.push_back(Im);
|
|
}
|
|
if (Ctx.Ptr != Ctx.End)
|
|
return make_error<GenericBinaryError>("Import section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseFunctionSection(ReadContext &Ctx) {
|
|
uint32_t Count = readVaruint32(Ctx);
|
|
FunctionTypes.reserve(Count);
|
|
uint32_t NumTypes = Signatures.size();
|
|
while (Count--) {
|
|
uint32_t Type = readVaruint32(Ctx);
|
|
if (Type >= NumTypes)
|
|
return make_error<GenericBinaryError>("Invalid function type",
|
|
object_error::parse_failed);
|
|
FunctionTypes.push_back(Type);
|
|
}
|
|
if (Ctx.Ptr != Ctx.End)
|
|
return make_error<GenericBinaryError>("Function section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseTableSection(ReadContext &Ctx) {
|
|
uint32_t Count = readVaruint32(Ctx);
|
|
Tables.reserve(Count);
|
|
while (Count--) {
|
|
Tables.push_back(readTable(Ctx));
|
|
if (Tables.back().ElemType != wasm::WASM_TYPE_FUNCREF) {
|
|
return make_error<GenericBinaryError>("Invalid table element type",
|
|
object_error::parse_failed);
|
|
}
|
|
}
|
|
if (Ctx.Ptr != Ctx.End)
|
|
return make_error<GenericBinaryError>("Table section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseMemorySection(ReadContext &Ctx) {
|
|
uint32_t Count = readVaruint32(Ctx);
|
|
Memories.reserve(Count);
|
|
while (Count--) {
|
|
Memories.push_back(readLimits(Ctx));
|
|
}
|
|
if (Ctx.Ptr != Ctx.End)
|
|
return make_error<GenericBinaryError>("Memory section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseGlobalSection(ReadContext &Ctx) {
|
|
GlobalSection = Sections.size();
|
|
uint32_t Count = readVaruint32(Ctx);
|
|
Globals.reserve(Count);
|
|
while (Count--) {
|
|
wasm::WasmGlobal Global;
|
|
Global.Index = NumImportedGlobals + Globals.size();
|
|
Global.Type.Type = readUint8(Ctx);
|
|
Global.Type.Mutable = readVaruint1(Ctx);
|
|
if (Error Err = readInitExpr(Global.InitExpr, Ctx))
|
|
return Err;
|
|
Globals.push_back(Global);
|
|
}
|
|
if (Ctx.Ptr != Ctx.End)
|
|
return make_error<GenericBinaryError>("Global section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseEventSection(ReadContext &Ctx) {
|
|
EventSection = Sections.size();
|
|
uint32_t Count = readVarint32(Ctx);
|
|
Events.reserve(Count);
|
|
while (Count--) {
|
|
wasm::WasmEvent Event;
|
|
Event.Index = NumImportedEvents + Events.size();
|
|
Event.Type.Attribute = readVaruint32(Ctx);
|
|
Event.Type.SigIndex = readVarint32(Ctx);
|
|
Events.push_back(Event);
|
|
}
|
|
|
|
if (Ctx.Ptr != Ctx.End)
|
|
return make_error<GenericBinaryError>("Event section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseExportSection(ReadContext &Ctx) {
|
|
uint32_t Count = readVaruint32(Ctx);
|
|
Exports.reserve(Count);
|
|
for (uint32_t I = 0; I < Count; I++) {
|
|
wasm::WasmExport Ex;
|
|
Ex.Name = readString(Ctx);
|
|
Ex.Kind = readUint8(Ctx);
|
|
Ex.Index = readVaruint32(Ctx);
|
|
switch (Ex.Kind) {
|
|
case wasm::WASM_EXTERNAL_FUNCTION:
|
|
if (!isValidFunctionIndex(Ex.Index))
|
|
return make_error<GenericBinaryError>("Invalid function export",
|
|
object_error::parse_failed);
|
|
break;
|
|
case wasm::WASM_EXTERNAL_GLOBAL:
|
|
if (!isValidGlobalIndex(Ex.Index))
|
|
return make_error<GenericBinaryError>("Invalid global export",
|
|
object_error::parse_failed);
|
|
break;
|
|
case wasm::WASM_EXTERNAL_EVENT:
|
|
if (!isValidEventIndex(Ex.Index))
|
|
return make_error<GenericBinaryError>("Invalid event export",
|
|
object_error::parse_failed);
|
|
break;
|
|
case wasm::WASM_EXTERNAL_MEMORY:
|
|
case wasm::WASM_EXTERNAL_TABLE:
|
|
break;
|
|
default:
|
|
return make_error<GenericBinaryError>("Unexpected export kind",
|
|
object_error::parse_failed);
|
|
}
|
|
Exports.push_back(Ex);
|
|
}
|
|
if (Ctx.Ptr != Ctx.End)
|
|
return make_error<GenericBinaryError>("Export section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
bool WasmObjectFile::isValidFunctionIndex(uint32_t Index) const {
|
|
return Index < NumImportedFunctions + FunctionTypes.size();
|
|
}
|
|
|
|
bool WasmObjectFile::isDefinedFunctionIndex(uint32_t Index) const {
|
|
return Index >= NumImportedFunctions && isValidFunctionIndex(Index);
|
|
}
|
|
|
|
bool WasmObjectFile::isValidGlobalIndex(uint32_t Index) const {
|
|
return Index < NumImportedGlobals + Globals.size();
|
|
}
|
|
|
|
bool WasmObjectFile::isDefinedGlobalIndex(uint32_t Index) const {
|
|
return Index >= NumImportedGlobals && isValidGlobalIndex(Index);
|
|
}
|
|
|
|
bool WasmObjectFile::isValidEventIndex(uint32_t Index) const {
|
|
return Index < NumImportedEvents + Events.size();
|
|
}
|
|
|
|
bool WasmObjectFile::isDefinedEventIndex(uint32_t Index) const {
|
|
return Index >= NumImportedEvents && isValidEventIndex(Index);
|
|
}
|
|
|
|
bool WasmObjectFile::isValidFunctionSymbol(uint32_t Index) const {
|
|
return Index < Symbols.size() && Symbols[Index].isTypeFunction();
|
|
}
|
|
|
|
bool WasmObjectFile::isValidGlobalSymbol(uint32_t Index) const {
|
|
return Index < Symbols.size() && Symbols[Index].isTypeGlobal();
|
|
}
|
|
|
|
bool WasmObjectFile::isValidEventSymbol(uint32_t Index) const {
|
|
return Index < Symbols.size() && Symbols[Index].isTypeEvent();
|
|
}
|
|
|
|
bool WasmObjectFile::isValidDataSymbol(uint32_t Index) const {
|
|
return Index < Symbols.size() && Symbols[Index].isTypeData();
|
|
}
|
|
|
|
bool WasmObjectFile::isValidSectionSymbol(uint32_t Index) const {
|
|
return Index < Symbols.size() && Symbols[Index].isTypeSection();
|
|
}
|
|
|
|
wasm::WasmFunction &WasmObjectFile::getDefinedFunction(uint32_t Index) {
|
|
assert(isDefinedFunctionIndex(Index));
|
|
return Functions[Index - NumImportedFunctions];
|
|
}
|
|
|
|
const wasm::WasmFunction &
|
|
WasmObjectFile::getDefinedFunction(uint32_t Index) const {
|
|
assert(isDefinedFunctionIndex(Index));
|
|
return Functions[Index - NumImportedFunctions];
|
|
}
|
|
|
|
wasm::WasmGlobal &WasmObjectFile::getDefinedGlobal(uint32_t Index) {
|
|
assert(isDefinedGlobalIndex(Index));
|
|
return Globals[Index - NumImportedGlobals];
|
|
}
|
|
|
|
wasm::WasmEvent &WasmObjectFile::getDefinedEvent(uint32_t Index) {
|
|
assert(isDefinedEventIndex(Index));
|
|
return Events[Index - NumImportedEvents];
|
|
}
|
|
|
|
Error WasmObjectFile::parseStartSection(ReadContext &Ctx) {
|
|
StartFunction = readVaruint32(Ctx);
|
|
if (!isValidFunctionIndex(StartFunction))
|
|
return make_error<GenericBinaryError>("Invalid start function",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseCodeSection(ReadContext &Ctx) {
|
|
CodeSection = Sections.size();
|
|
uint32_t FunctionCount = readVaruint32(Ctx);
|
|
if (FunctionCount != FunctionTypes.size()) {
|
|
return make_error<GenericBinaryError>("Invalid function count",
|
|
object_error::parse_failed);
|
|
}
|
|
|
|
while (FunctionCount--) {
|
|
wasm::WasmFunction Function;
|
|
const uint8_t *FunctionStart = Ctx.Ptr;
|
|
uint32_t Size = readVaruint32(Ctx);
|
|
const uint8_t *FunctionEnd = Ctx.Ptr + Size;
|
|
|
|
Function.CodeOffset = Ctx.Ptr - FunctionStart;
|
|
Function.Index = NumImportedFunctions + Functions.size();
|
|
Function.CodeSectionOffset = FunctionStart - Ctx.Start;
|
|
Function.Size = FunctionEnd - FunctionStart;
|
|
|
|
uint32_t NumLocalDecls = readVaruint32(Ctx);
|
|
Function.Locals.reserve(NumLocalDecls);
|
|
while (NumLocalDecls--) {
|
|
wasm::WasmLocalDecl Decl;
|
|
Decl.Count = readVaruint32(Ctx);
|
|
Decl.Type = readUint8(Ctx);
|
|
Function.Locals.push_back(Decl);
|
|
}
|
|
|
|
uint32_t BodySize = FunctionEnd - Ctx.Ptr;
|
|
Function.Body = ArrayRef<uint8_t>(Ctx.Ptr, BodySize);
|
|
// This will be set later when reading in the linking metadata section.
|
|
Function.Comdat = UINT32_MAX;
|
|
Ctx.Ptr += BodySize;
|
|
assert(Ctx.Ptr == FunctionEnd);
|
|
Functions.push_back(Function);
|
|
}
|
|
if (Ctx.Ptr != Ctx.End)
|
|
return make_error<GenericBinaryError>("Code section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseElemSection(ReadContext &Ctx) {
|
|
uint32_t Count = readVaruint32(Ctx);
|
|
ElemSegments.reserve(Count);
|
|
while (Count--) {
|
|
wasm::WasmElemSegment Segment;
|
|
Segment.TableIndex = readVaruint32(Ctx);
|
|
if (Segment.TableIndex != 0) {
|
|
return make_error<GenericBinaryError>("Invalid TableIndex",
|
|
object_error::parse_failed);
|
|
}
|
|
if (Error Err = readInitExpr(Segment.Offset, Ctx))
|
|
return Err;
|
|
uint32_t NumElems = readVaruint32(Ctx);
|
|
while (NumElems--) {
|
|
Segment.Functions.push_back(readVaruint32(Ctx));
|
|
}
|
|
ElemSegments.push_back(Segment);
|
|
}
|
|
if (Ctx.Ptr != Ctx.End)
|
|
return make_error<GenericBinaryError>("Elem section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseDataSection(ReadContext &Ctx) {
|
|
DataSection = Sections.size();
|
|
uint32_t Count = readVaruint32(Ctx);
|
|
if (DataCount && Count != DataCount.getValue())
|
|
return make_error<GenericBinaryError>(
|
|
"Number of data segments does not match DataCount section");
|
|
DataSegments.reserve(Count);
|
|
while (Count--) {
|
|
WasmSegment Segment;
|
|
Segment.Data.InitFlags = readVaruint32(Ctx);
|
|
Segment.Data.MemoryIndex = (Segment.Data.InitFlags & wasm::WASM_SEGMENT_HAS_MEMINDEX)
|
|
? readVaruint32(Ctx) : 0;
|
|
if ((Segment.Data.InitFlags & wasm::WASM_SEGMENT_IS_PASSIVE) == 0) {
|
|
if (Error Err = readInitExpr(Segment.Data.Offset, Ctx))
|
|
return Err;
|
|
} else {
|
|
Segment.Data.Offset.Opcode = wasm::WASM_OPCODE_I32_CONST;
|
|
Segment.Data.Offset.Value.Int32 = 0;
|
|
}
|
|
uint32_t Size = readVaruint32(Ctx);
|
|
if (Size > (size_t)(Ctx.End - Ctx.Ptr))
|
|
return make_error<GenericBinaryError>("Invalid segment size",
|
|
object_error::parse_failed);
|
|
Segment.Data.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size);
|
|
// The rest of these Data fields are set later, when reading in the linking
|
|
// metadata section.
|
|
Segment.Data.Alignment = 0;
|
|
Segment.Data.LinkerFlags = 0;
|
|
Segment.Data.Comdat = UINT32_MAX;
|
|
Segment.SectionOffset = Ctx.Ptr - Ctx.Start;
|
|
Ctx.Ptr += Size;
|
|
DataSegments.push_back(Segment);
|
|
}
|
|
if (Ctx.Ptr != Ctx.End)
|
|
return make_error<GenericBinaryError>("Data section ended prematurely",
|
|
object_error::parse_failed);
|
|
return Error::success();
|
|
}
|
|
|
|
Error WasmObjectFile::parseDataCountSection(ReadContext &Ctx) {
|
|
DataCount = readVaruint32(Ctx);
|
|
return Error::success();
|
|
}
|
|
|
|
const wasm::WasmObjectHeader &WasmObjectFile::getHeader() const {
|
|
return Header;
|
|
}
|
|
|
|
void WasmObjectFile::moveSymbolNext(DataRefImpl &Symb) const { Symb.d.b++; }
|
|
|
|
uint32_t WasmObjectFile::getSymbolFlags(DataRefImpl Symb) const {
|
|
uint32_t Result = SymbolRef::SF_None;
|
|
const WasmSymbol &Sym = getWasmSymbol(Symb);
|
|
|
|
LLVM_DEBUG(dbgs() << "getSymbolFlags: ptr=" << &Sym << " " << Sym << "\n");
|
|
if (Sym.isBindingWeak())
|
|
Result |= SymbolRef::SF_Weak;
|
|
if (!Sym.isBindingLocal())
|
|
Result |= SymbolRef::SF_Global;
|
|
if (Sym.isHidden())
|
|
Result |= SymbolRef::SF_Hidden;
|
|
if (!Sym.isDefined())
|
|
Result |= SymbolRef::SF_Undefined;
|
|
if (Sym.isTypeFunction())
|
|
Result |= SymbolRef::SF_Executable;
|
|
return Result;
|
|
}
|
|
|
|
basic_symbol_iterator WasmObjectFile::symbol_begin() const {
|
|
DataRefImpl Ref;
|
|
Ref.d.a = 1; // Arbitrary non-zero value so that Ref.p is non-null
|
|
Ref.d.b = 0; // Symbol index
|
|
return BasicSymbolRef(Ref, this);
|
|
}
|
|
|
|
basic_symbol_iterator WasmObjectFile::symbol_end() const {
|
|
DataRefImpl Ref;
|
|
Ref.d.a = 1; // Arbitrary non-zero value so that Ref.p is non-null
|
|
Ref.d.b = Symbols.size(); // Symbol index
|
|
return BasicSymbolRef(Ref, this);
|
|
}
|
|
|
|
const WasmSymbol &WasmObjectFile::getWasmSymbol(const DataRefImpl &Symb) const {
|
|
return Symbols[Symb.d.b];
|
|
}
|
|
|
|
const WasmSymbol &WasmObjectFile::getWasmSymbol(const SymbolRef &Symb) const {
|
|
return getWasmSymbol(Symb.getRawDataRefImpl());
|
|
}
|
|
|
|
Expected<StringRef> WasmObjectFile::getSymbolName(DataRefImpl Symb) const {
|
|
return getWasmSymbol(Symb).Info.Name;
|
|
}
|
|
|
|
Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const {
|
|
auto &Sym = getWasmSymbol(Symb);
|
|
if (Sym.Info.Kind == wasm::WASM_SYMBOL_TYPE_FUNCTION &&
|
|
isDefinedFunctionIndex(Sym.Info.ElementIndex))
|
|
return getDefinedFunction(Sym.Info.ElementIndex).CodeSectionOffset;
|
|
else
|
|
return getSymbolValue(Symb);
|
|
}
|
|
|
|
uint64_t WasmObjectFile::getWasmSymbolValue(const WasmSymbol &Sym) const {
|
|
switch (Sym.Info.Kind) {
|
|
case wasm::WASM_SYMBOL_TYPE_FUNCTION:
|
|
case wasm::WASM_SYMBOL_TYPE_GLOBAL:
|
|
case wasm::WASM_SYMBOL_TYPE_EVENT:
|
|
return Sym.Info.ElementIndex;
|
|
case wasm::WASM_SYMBOL_TYPE_DATA: {
|
|
// The value of a data symbol is the segment offset, plus the symbol
|
|
// offset within the segment.
|
|
uint32_t SegmentIndex = Sym.Info.DataRef.Segment;
|
|
const wasm::WasmDataSegment &Segment = DataSegments[SegmentIndex].Data;
|
|
assert(Segment.Offset.Opcode == wasm::WASM_OPCODE_I32_CONST);
|
|
return Segment.Offset.Value.Int32 + Sym.Info.DataRef.Offset;
|
|
}
|
|
case wasm::WASM_SYMBOL_TYPE_SECTION:
|
|
return 0;
|
|
}
|
|
llvm_unreachable("invalid symbol type");
|
|
}
|
|
|
|
uint64_t WasmObjectFile::getSymbolValueImpl(DataRefImpl Symb) const {
|
|
return getWasmSymbolValue(getWasmSymbol(Symb));
|
|
}
|
|
|
|
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.Info.Kind) {
|
|
case wasm::WASM_SYMBOL_TYPE_FUNCTION:
|
|
return SymbolRef::ST_Function;
|
|
case wasm::WASM_SYMBOL_TYPE_GLOBAL:
|
|
return SymbolRef::ST_Other;
|
|
case wasm::WASM_SYMBOL_TYPE_DATA:
|
|
return SymbolRef::ST_Data;
|
|
case wasm::WASM_SYMBOL_TYPE_SECTION:
|
|
return SymbolRef::ST_Debug;
|
|
case wasm::WASM_SYMBOL_TYPE_EVENT:
|
|
return SymbolRef::ST_Other;
|
|
}
|
|
|
|
llvm_unreachable("Unknown WasmSymbol::SymbolType");
|
|
return SymbolRef::ST_Other;
|
|
}
|
|
|
|
Expected<section_iterator>
|
|
WasmObjectFile::getSymbolSection(DataRefImpl Symb) const {
|
|
const WasmSymbol &Sym = getWasmSymbol(Symb);
|
|
if (Sym.isUndefined())
|
|
return section_end();
|
|
|
|
DataRefImpl Ref;
|
|
switch (Sym.Info.Kind) {
|
|
case wasm::WASM_SYMBOL_TYPE_FUNCTION:
|
|
Ref.d.a = CodeSection;
|
|
break;
|
|
case wasm::WASM_SYMBOL_TYPE_GLOBAL:
|
|
Ref.d.a = GlobalSection;
|
|
break;
|
|
case wasm::WASM_SYMBOL_TYPE_DATA:
|
|
Ref.d.a = DataSection;
|
|
break;
|
|
case wasm::WASM_SYMBOL_TYPE_SECTION:
|
|
Ref.d.a = Sym.Info.ElementIndex;
|
|
break;
|
|
case wasm::WASM_SYMBOL_TYPE_EVENT:
|
|
Ref.d.a = EventSection;
|
|
break;
|
|
default:
|
|
llvm_unreachable("Unknown WasmSymbol::SymbolType");
|
|
}
|
|
return section_iterator(SectionRef(Ref, this));
|
|
}
|
|
|
|
void WasmObjectFile::moveSectionNext(DataRefImpl &Sec) const { Sec.d.a++; }
|
|
|
|
Expected<StringRef> WasmObjectFile::getSectionName(DataRefImpl Sec) const {
|
|
const WasmSection &S = Sections[Sec.d.a];
|
|
#define ECase(X) \
|
|
case wasm::WASM_SEC_##X: \
|
|
return #X;
|
|
switch (S.Type) {
|
|
ECase(TYPE);
|
|
ECase(IMPORT);
|
|
ECase(FUNCTION);
|
|
ECase(TABLE);
|
|
ECase(MEMORY);
|
|
ECase(GLOBAL);
|
|
ECase(EVENT);
|
|
ECase(EXPORT);
|
|
ECase(START);
|
|
ECase(ELEM);
|
|
ECase(CODE);
|
|
ECase(DATA);
|
|
ECase(DATACOUNT);
|
|
case wasm::WASM_SEC_CUSTOM:
|
|
return S.Name;
|
|
default:
|
|
return createStringError(object_error::invalid_section_index, "");
|
|
}
|
|
#undef ECase
|
|
}
|
|
|
|
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();
|
|
}
|
|
|
|
Expected<ArrayRef<uint8_t>>
|
|
WasmObjectFile::getSectionContents(DataRefImpl Sec) 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).
|
|
return S.Content;
|
|
}
|
|
|
|
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 Ref) const {
|
|
const wasm::WasmRelocation &Rel = getWasmRelocation(Ref);
|
|
if (Rel.Type == wasm::R_WASM_TYPE_INDEX_LEB)
|
|
return symbol_end();
|
|
DataRefImpl Sym;
|
|
Sym.d.a = 1;
|
|
Sym.d.b = Rel.Index;
|
|
return symbol_iterator(SymbolRef(Sym, this));
|
|
}
|
|
|
|
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.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"; }
|
|
|
|
Triple::ArchType WasmObjectFile::getArch() const { return Triple::wasm32; }
|
|
|
|
SubtargetFeatures WasmObjectFile::getFeatures() const {
|
|
return SubtargetFeatures();
|
|
}
|
|
|
|
bool WasmObjectFile::isRelocatableObject() const { return HasLinkingSection; }
|
|
|
|
bool WasmObjectFile::isSharedObject() const { return HasDylinkSection; }
|
|
|
|
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];
|
|
assert(Ref.d.b < Sec.Relocations.size());
|
|
return Sec.Relocations[Ref.d.b];
|
|
}
|
|
|
|
int WasmSectionOrderChecker::getSectionOrder(unsigned ID,
|
|
StringRef CustomSectionName) {
|
|
switch (ID) {
|
|
case wasm::WASM_SEC_CUSTOM:
|
|
return StringSwitch<unsigned>(CustomSectionName)
|
|
.Case("dylink", WASM_SEC_ORDER_DYLINK)
|
|
.Case("linking", WASM_SEC_ORDER_LINKING)
|
|
.StartsWith("reloc.", WASM_SEC_ORDER_RELOC)
|
|
.Case("name", WASM_SEC_ORDER_NAME)
|
|
.Case("producers", WASM_SEC_ORDER_PRODUCERS)
|
|
.Case("target_features", WASM_SEC_ORDER_TARGET_FEATURES)
|
|
.Default(WASM_SEC_ORDER_NONE);
|
|
case wasm::WASM_SEC_TYPE:
|
|
return WASM_SEC_ORDER_TYPE;
|
|
case wasm::WASM_SEC_IMPORT:
|
|
return WASM_SEC_ORDER_IMPORT;
|
|
case wasm::WASM_SEC_FUNCTION:
|
|
return WASM_SEC_ORDER_FUNCTION;
|
|
case wasm::WASM_SEC_TABLE:
|
|
return WASM_SEC_ORDER_TABLE;
|
|
case wasm::WASM_SEC_MEMORY:
|
|
return WASM_SEC_ORDER_MEMORY;
|
|
case wasm::WASM_SEC_GLOBAL:
|
|
return WASM_SEC_ORDER_GLOBAL;
|
|
case wasm::WASM_SEC_EXPORT:
|
|
return WASM_SEC_ORDER_EXPORT;
|
|
case wasm::WASM_SEC_START:
|
|
return WASM_SEC_ORDER_START;
|
|
case wasm::WASM_SEC_ELEM:
|
|
return WASM_SEC_ORDER_ELEM;
|
|
case wasm::WASM_SEC_CODE:
|
|
return WASM_SEC_ORDER_CODE;
|
|
case wasm::WASM_SEC_DATA:
|
|
return WASM_SEC_ORDER_DATA;
|
|
case wasm::WASM_SEC_DATACOUNT:
|
|
return WASM_SEC_ORDER_DATACOUNT;
|
|
case wasm::WASM_SEC_EVENT:
|
|
return WASM_SEC_ORDER_EVENT;
|
|
default:
|
|
return WASM_SEC_ORDER_NONE;
|
|
}
|
|
}
|
|
|
|
// Represents the edges in a directed graph where any node B reachable from node
|
|
// A is not allowed to appear before A in the section ordering, but may appear
|
|
// afterward.
|
|
int WasmSectionOrderChecker::DisallowedPredecessors[WASM_NUM_SEC_ORDERS][WASM_NUM_SEC_ORDERS] = {
|
|
{}, // WASM_SEC_ORDER_NONE
|
|
{WASM_SEC_ORDER_TYPE, WASM_SEC_ORDER_IMPORT}, // WASM_SEC_ORDER_TYPE,
|
|
{WASM_SEC_ORDER_IMPORT, WASM_SEC_ORDER_FUNCTION}, // WASM_SEC_ORDER_IMPORT,
|
|
{WASM_SEC_ORDER_FUNCTION, WASM_SEC_ORDER_TABLE}, // WASM_SEC_ORDER_FUNCTION,
|
|
{WASM_SEC_ORDER_TABLE, WASM_SEC_ORDER_MEMORY}, // WASM_SEC_ORDER_TABLE,
|
|
{WASM_SEC_ORDER_MEMORY, WASM_SEC_ORDER_GLOBAL}, // WASM_SEC_ORDER_MEMORY,
|
|
{WASM_SEC_ORDER_GLOBAL, WASM_SEC_ORDER_EVENT}, // WASM_SEC_ORDER_GLOBAL,
|
|
{WASM_SEC_ORDER_EVENT, WASM_SEC_ORDER_EXPORT}, // WASM_SEC_ORDER_EVENT,
|
|
{WASM_SEC_ORDER_EXPORT, WASM_SEC_ORDER_START}, // WASM_SEC_ORDER_EXPORT,
|
|
{WASM_SEC_ORDER_START, WASM_SEC_ORDER_ELEM}, // WASM_SEC_ORDER_START,
|
|
{WASM_SEC_ORDER_ELEM, WASM_SEC_ORDER_DATACOUNT}, // WASM_SEC_ORDER_ELEM,
|
|
{WASM_SEC_ORDER_DATACOUNT, WASM_SEC_ORDER_CODE}, // WASM_SEC_ORDER_DATACOUNT,
|
|
{WASM_SEC_ORDER_CODE, WASM_SEC_ORDER_DATA}, // WASM_SEC_ORDER_CODE,
|
|
{WASM_SEC_ORDER_DATA, WASM_SEC_ORDER_LINKING}, // WASM_SEC_ORDER_DATA,
|
|
|
|
// Custom Sections
|
|
{WASM_SEC_ORDER_DYLINK, WASM_SEC_ORDER_TYPE}, // WASM_SEC_ORDER_DYLINK,
|
|
{WASM_SEC_ORDER_LINKING, WASM_SEC_ORDER_RELOC, WASM_SEC_ORDER_NAME}, // WASM_SEC_ORDER_LINKING,
|
|
{}, // WASM_SEC_ORDER_RELOC (can be repeated),
|
|
{WASM_SEC_ORDER_NAME, WASM_SEC_ORDER_PRODUCERS}, // WASM_SEC_ORDER_NAME,
|
|
{WASM_SEC_ORDER_PRODUCERS, WASM_SEC_ORDER_TARGET_FEATURES}, // WASM_SEC_ORDER_PRODUCERS,
|
|
{WASM_SEC_ORDER_TARGET_FEATURES} // WASM_SEC_ORDER_TARGET_FEATURES
|
|
};
|
|
|
|
bool WasmSectionOrderChecker::isValidSectionOrder(unsigned ID,
|
|
StringRef CustomSectionName) {
|
|
int Order = getSectionOrder(ID, CustomSectionName);
|
|
if (Order == WASM_SEC_ORDER_NONE)
|
|
return true;
|
|
|
|
// Disallowed predecessors we need to check for
|
|
SmallVector<int, WASM_NUM_SEC_ORDERS> WorkList;
|
|
|
|
// Keep track of completed checks to avoid repeating work
|
|
bool Checked[WASM_NUM_SEC_ORDERS] = {};
|
|
|
|
int Curr = Order;
|
|
while (true) {
|
|
// Add new disallowed predecessors to work list
|
|
for (size_t I = 0;; ++I) {
|
|
int Next = DisallowedPredecessors[Curr][I];
|
|
if (Next == WASM_SEC_ORDER_NONE)
|
|
break;
|
|
if (Checked[Next])
|
|
continue;
|
|
WorkList.push_back(Next);
|
|
Checked[Next] = true;
|
|
}
|
|
|
|
if (WorkList.empty())
|
|
break;
|
|
|
|
// Consider next disallowed predecessor
|
|
Curr = WorkList.pop_back_val();
|
|
if (Seen[Curr])
|
|
return false;
|
|
}
|
|
|
|
// Have not seen any disallowed predecessors
|
|
Seen[Order] = true;
|
|
return true;
|
|
}
|