1/*
2 * Copyright (C) 2016-2018 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 "WasmModuleParser.h"
28
29#if ENABLE(WEBASSEMBLY)
30
31#include "IdentifierInlines.h"
32#include "WasmMemoryInformation.h"
33#include "WasmNameSectionParser.h"
34#include "WasmOps.h"
35#include "WasmSectionParser.h"
36#include "WasmSections.h"
37#include <wtf/SHA1.h>
38
39namespace JSC { namespace Wasm {
40
41auto ModuleParser::parse() -> Result
42{
43 const size_t minSize = 8;
44 uint32_t versionNumber;
45
46 WASM_PARSER_FAIL_IF(length() < minSize, "expected a module of at least ", minSize, " bytes");
47 WASM_PARSER_FAIL_IF(length() > maxModuleSize, "module size ", length(), " is too large, maximum ", maxModuleSize);
48 WASM_PARSER_FAIL_IF(!consumeCharacter(0) || !consumeString("asm"), "modules doesn't start with '\\0asm'");
49 WASM_PARSER_FAIL_IF(!parseUInt32(versionNumber), "can't parse version number");
50 WASM_PARSER_FAIL_IF(versionNumber != expectedVersionNumber, "unexpected version number ", versionNumber, " expected ", expectedVersionNumber);
51
52 // This is not really a known section.
53 Section previousKnownSection = Section::Begin;
54 while (m_offset < length()) {
55 uint8_t sectionByte;
56
57 WASM_PARSER_FAIL_IF(!parseUInt7(sectionByte), "can't get section byte");
58
59 Section section = Section::Custom;
60 WASM_PARSER_FAIL_IF(!decodeSection(sectionByte, section));
61 ASSERT(section != Section::Begin);
62
63 uint32_t sectionLength;
64 WASM_PARSER_FAIL_IF(!validateOrder(previousKnownSection, section), "invalid section order, ", previousKnownSection, " followed by ", section);
65 WASM_PARSER_FAIL_IF(!parseVarUInt32(sectionLength), "can't get ", section, " section's length");
66 WASM_PARSER_FAIL_IF(sectionLength > length() - m_offset, section, " section of size ", sectionLength, " would overflow Module's size");
67
68 SectionParser parser(source() + m_offset, sectionLength, m_offset, m_info.get());
69
70 switch (section) {
71#define WASM_SECTION_PARSE(NAME, ID, DESCRIPTION) \
72 case Section::NAME: { \
73 WASM_FAIL_IF_HELPER_FAILS(parser.parse ## NAME()); \
74 break; \
75 }
76 FOR_EACH_KNOWN_WASM_SECTION(WASM_SECTION_PARSE)
77#undef WASM_SECTION_PARSE
78
79 case Section::Custom: {
80 WASM_FAIL_IF_HELPER_FAILS(parser.parseCustom());
81 break;
82 }
83
84 case Section::Begin: {
85 RELEASE_ASSERT_NOT_REACHED();
86 break;
87 }
88 }
89
90 WASM_PARSER_FAIL_IF(parser.length() != parser.offset(), "parsing ended before the end of ", section, " section");
91
92 m_offset += sectionLength;
93
94
95 if (isKnownSection(section))
96 previousKnownSection = section;
97 }
98
99 if (UNLIKELY(Options::useEagerWebAssemblyModuleHashing())) {
100 SHA1 hasher;
101 hasher.addBytes(source(), length());
102 m_info->nameSection->setHash(hasher.computeHexDigest());
103 }
104
105 return { };
106}
107
108} } // namespace JSC::Wasm
109
110#endif // ENABLE(WEBASSEMBLY)
111