WasmNameSectionParser.cpp [plain text]
#include "config.h"
#include "WasmNameSectionParser.h"
#if ENABLE(WEBASSEMBLY)
#include "WasmNameSection.h"
namespace JSC { namespace Wasm {
auto NameSectionParser::parse() -> Result
{
Ref<NameSection> nameSection = NameSection::create();
WASM_PARSER_FAIL_IF(!nameSection->functionNames.tryReserveCapacity(m_info.functionIndexSpaceSize()), "can't allocate enough memory for function names");
nameSection->functionNames.resize(m_info.functionIndexSpaceSize());
for (size_t payloadNumber = 0; m_offset < length(); ++payloadNumber) {
uint8_t nameType;
uint32_t payloadLength;
WASM_PARSER_FAIL_IF(!parseUInt7(nameType), "can't get name type for payload ", payloadNumber);
WASM_PARSER_FAIL_IF(!parseVarUInt32(payloadLength), "can't get payload length for payload ", payloadNumber);
WASM_PARSER_FAIL_IF(payloadLength > length() - m_offset, "payload length is too big for payload ", payloadNumber);
const auto payloadStart = m_offset;
if (!isValidNameType(nameType)) {
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 ", payloadNumber);
WASM_PARSER_FAIL_IF(!consumeUTF8String(nameString, nameLen), "can't get module's name of length ", nameLen, " for payload ", payloadNumber);
nameSection->moduleName = WTFMove(nameString);
break;
}
case NameType::Function: {
uint32_t count;
WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get function count for payload ", 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 ", function, " index for payload ", payloadNumber);
WASM_PARSER_FAIL_IF(m_info.functionIndexSpaceSize() <= index, "function ", function, " index ", index, " is larger than function index space ", m_info.functionIndexSpaceSize(), " for payload ", payloadNumber);
WASM_PARSER_FAIL_IF(!parseVarUInt32(nameLen), "can't get functions ", function, "'s name length for payload ", payloadNumber);
WASM_PARSER_FAIL_IF(!consumeUTF8String(nameString, nameLen), "can't get function ", function, "'s name of length ", nameLen, " for payload ", payloadNumber);
nameSection->functionNames[index] = WTFMove(nameString);
}
break;
}
case NameType::Local: {
uint32_t functionIndex;
uint32_t count;
WASM_PARSER_FAIL_IF(!parseVarUInt32(functionIndex), "can't get local's function index for payload ", payloadNumber);
WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get local count for payload ", 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 ", local, " index for payload ", payloadNumber);
WASM_PARSER_FAIL_IF(!parseVarUInt32(nameLen), "can't get local ", local, "'s name length for payload ", payloadNumber);
WASM_PARSER_FAIL_IF(!consumeUTF8String(nameString, nameLen), "can't get local ", local, "'s name of length ", nameLen, " for payload ", payloadNumber);
}
break;
}
}
WASM_PARSER_FAIL_IF(payloadStart + payloadLength != m_offset);
}
return nameSection;
}
} }
#endif // ENABLE(WEBASSEMBLY)