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WasmNameSectionParser.cpp
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108 lines (98 loc) · 5.92 KB
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/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "WasmNameSectionParser.h"
#if ENABLE(WEBASSEMBLY)
#include "WasmNameSection.h"
#include "WasmTypeDefinitionInlines.h"
namespace JSC { namespace Wasm {
auto NameSectionParser::parse() -> Result
{
Ref<NameSection> nameSection = NameSection::create();
WASM_ALLOCATOR_FAIL_IF(!nameSection->functionNames.tryReserveCapacity(m_info.functionIndexSpaceSize()), "can't allocate enough memory for function names"_s);
nameSection->functionNames.resize(m_info.functionIndexSpaceSize());
for (size_t payloadNumber = 0; m_offset < source().size(); ++payloadNumber) {
uint8_t nameType;
uint32_t payloadLength;
WASM_PARSER_FAIL_IF(!parseUInt7(nameType), "can't get name type for payload "_s, payloadNumber);
WASM_PARSER_FAIL_IF(!parseVarUInt32(payloadLength), "can't get payload length for payload "_s, payloadNumber);
WASM_PARSER_FAIL_IF(payloadLength > source().size() - m_offset, "payload length is too big for payload "_s, payloadNumber);
const auto payloadStart = m_offset;
if (!isValidNameType(nameType)) {
// Unknown name section entries are simply ignored. This allows us to support newer toolchains without breaking older features.
m_offset += payloadLength;
continue;
}
switch (static_cast<NameType>(nameType)) {
case NameType::Module: {
uint32_t nameLen;
Name nameString;
WASM_PARSER_FAIL_IF(!parseVarUInt32(nameLen), "can't get module's name length for payload "_s, payloadNumber);
WASM_ALLOCATOR_FAIL_IF(!consumeUTF8String(nameString, nameLen), "can't get module's name of length "_s, nameLen, " for payload "_s, payloadNumber);
nameSection->moduleName = WTF::move(nameString);
break;
}
case NameType::Function: {
uint32_t count;
WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get function count for payload "_s, payloadNumber);
for (uint32_t function = 0; function < count; ++function) {
uint32_t index;
uint32_t nameLen;
Name nameString;
WASM_PARSER_FAIL_IF(!parseVarUInt32(index), "can't get function "_s, function, " index for payload "_s, payloadNumber);
WASM_PARSER_FAIL_IF(m_info.functionIndexSpaceSize() <= index, "function "_s, function, " index "_s, index, " is larger than function index space "_s, m_info.functionIndexSpaceSize(), " for payload "_s, payloadNumber);
WASM_PARSER_FAIL_IF(!parseVarUInt32(nameLen), "can't get functions "_s, function, "'s name length for payload "_s, payloadNumber);
WASM_ALLOCATOR_FAIL_IF(!consumeUTF8String(nameString, nameLen), "can't get function "_s, function, "'s name of length "_s, nameLen, " for payload "_s, payloadNumber);
nameSection->functionNames[index] = WTF::move(nameString);
}
break;
}
case NameType::Local: {
// 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.
uint32_t functionCount;
WASM_PARSER_FAIL_IF(!parseVarUInt32(functionCount), "can't get function count for local name payload "_s, payloadNumber);
for (uint32_t function = 0; function < functionCount; ++function) {
uint32_t functionIndex;
uint32_t count;
WASM_PARSER_FAIL_IF(!parseVarUInt32(functionIndex), "can't get local's function index for payload "_s, payloadNumber);
WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get local count for payload "_s, payloadNumber);
for (uint32_t local = 0; local < count; ++local) {
uint32_t index;
uint32_t nameLen;
Name nameString;
WASM_PARSER_FAIL_IF(!parseVarUInt32(index), "can't get local "_s, local, " index for payload "_s, payloadNumber);
WASM_PARSER_FAIL_IF(!parseVarUInt32(nameLen), "can't get local "_s, local, "'s name length for payload "_s, payloadNumber);
WASM_ALLOCATOR_FAIL_IF(!consumeUTF8String(nameString, nameLen), "can't get local "_s, local, "'s name of length "_s, nameLen, " for payload "_s, payloadNumber);
}
}
break;
}
}
WASM_PARSER_FAIL_IF(payloadStart + payloadLength != m_offset, "payload for name section is not correct size, expected "_s, payloadLength, " got "_s, m_offset - payloadStart);
}
return nameSection;
}
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)