1/*
2 * Copyright (C) 2017 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "WasmNameSectionParser.h"
28
29#if ENABLE(WEBASSEMBLY)
30
31#include "IdentifierInlines.h"
32#include "WasmNameSection.h"
33
34namespace JSC { namespace Wasm {
35
36auto NameSectionParser::parse() -> Result
37{
38 Ref<NameSection> nameSection = NameSection::create();
39 WASM_PARSER_FAIL_IF(!nameSection->functionNames.tryReserveCapacity(m_info.functionIndexSpaceSize()), "can't allocate enough memory for function names");
40 nameSection->functionNames.resize(m_info.functionIndexSpaceSize());
41
42 for (size_t payloadNumber = 0; m_offset < length(); ++payloadNumber) {
43 uint8_t nameType;
44 uint32_t payloadLength;
45 WASM_PARSER_FAIL_IF(!parseUInt7(nameType), "can't get name type for payload ", payloadNumber);
46 WASM_PARSER_FAIL_IF(!parseVarUInt32(payloadLength), "can't get payload length for payload ", payloadNumber);
47 WASM_PARSER_FAIL_IF(payloadLength > length() - m_offset, "payload length is too big for payload ", payloadNumber);
48 const auto payloadStart = m_offset;
49
50 if (!isValidNameType(nameType)) {
51 // Unknown name section entries are simply ignored. This allows us to support newer toolchains without breaking older features.
52 m_offset += payloadLength;
53 continue;
54 }
55
56 switch (static_cast<NameType>(nameType)) {
57 case NameType::Module: {
58 uint32_t nameLen;
59 Name nameString;
60 WASM_PARSER_FAIL_IF(!parseVarUInt32(nameLen), "can't get module's name length for payload ", payloadNumber);
61 WASM_PARSER_FAIL_IF(!consumeUTF8String(nameString, nameLen), "can't get module's name of length ", nameLen, " for payload ", payloadNumber);
62 nameSection->moduleName = WTFMove(nameString);
63 break;
64 }
65 case NameType::Function: {
66 uint32_t count;
67 WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get function count for payload ", payloadNumber);
68 for (uint32_t function = 0; function < count; ++function) {
69 uint32_t index;
70 uint32_t nameLen;
71 Name nameString;
72 WASM_PARSER_FAIL_IF(!parseVarUInt32(index), "can't get function ", function, " index for payload ", payloadNumber);
73 WASM_PARSER_FAIL_IF(m_info.functionIndexSpaceSize() <= index, "function ", function, " index ", index, " is larger than function index space ", m_info.functionIndexSpaceSize(), " for payload ", payloadNumber);
74 WASM_PARSER_FAIL_IF(!parseVarUInt32(nameLen), "can't get functions ", function, "'s name length for payload ", payloadNumber);
75 WASM_PARSER_FAIL_IF(!consumeUTF8String(nameString, nameLen), "can't get function ", function, "'s name of length ", nameLen, " for payload ", payloadNumber);
76 nameSection->functionNames[index] = WTFMove(nameString);
77 }
78 break;
79 }
80 case NameType::Local: {
81 // Ignore local names for now, we don't do anything with them but we still need to parse them in order to properly ignore them.
82 uint32_t functionIndex;
83 uint32_t count;
84 WASM_PARSER_FAIL_IF(!parseVarUInt32(functionIndex), "can't get local's function index for payload ", payloadNumber);
85 WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get local count for payload ", payloadNumber);
86 for (uint32_t local = 0; local < count; ++local) {
87 uint32_t index;
88 uint32_t nameLen;
89 Name nameString;
90 WASM_PARSER_FAIL_IF(!parseVarUInt32(index), "can't get local ", local, " index for payload ", payloadNumber);
91 WASM_PARSER_FAIL_IF(!parseVarUInt32(nameLen), "can't get local ", local, "'s name length for payload ", payloadNumber);
92 WASM_PARSER_FAIL_IF(!consumeUTF8String(nameString, nameLen), "can't get local ", local, "'s name of length ", nameLen, " for payload ", payloadNumber);
93 }
94 break;
95 }
96 }
97 WASM_PARSER_FAIL_IF(payloadStart + payloadLength != m_offset);
98 }
99 return nameSection;
100}
101
102} } // namespace JSC::Wasm
103
104#endif // ENABLE(WEBASSEMBLY)
105