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LibWasm: Read from and write to memory as little-endian

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The spec says so, we must do so.
This commit is contained in:
Ali Mohammad Pur 2021-06-04 03:25:52 +04:30 committed by Ali Mohammad Pur
parent 09cf1040ef
commit 9db418e1fb
Notes: sideshowbarker 2024-07-18 16:54:38 +09:00 
Author: https://github.com/alimpfard
Commit: https://github.com/SerenityOS/serenity/commit/9db418e1fb0
Pull-request: https://github.com/SerenityOS/serenity/pull/7756
1 changed files with 13 additions and 15 deletions
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28
Userland/Libraries/LibWasm/AbstractMachine/Interpreter.cpp
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@ -94,10 +94,7 @@ void BytecodeInterpreter::load_and_push(Configuration& configuration, const Inst
}
dbgln_if(WASM_TRACE_DEBUG, "load({} : {}) -> stack", instance_address, sizeof(ReadType));
auto slice = memory->data().bytes().slice(instance_address, sizeof(ReadType));
if constexpr (sizeof(ReadType) == 1)
configuration.stack().peek() = Value(static_cast<PushType>(slice[0]));
else
configuration.stack().peek() = Value(read_value<PushType>(slice));
configuration.stack().peek() = Value(static_cast<PushType>(read_value<ReadType>(slice)));
}
void BytecodeInterpreter::store_to_memory(Configuration& configuration, const Instruction& instruction, ReadonlyBytes data)
@ -210,25 +207,26 @@ void BytecodeInterpreter::call_address(Configuration& configuration, FunctionAdd
#define LOAD_AND_PUSH(read_type, push_type) \
do { \
return load_and_push<read_type, push_type>(configuration, instruction); \
return; \
} while (false)
#define POP_AND_STORE(pop_type, store_type) \
do { \
auto value = ConvertToRaw<pop_type> {}(*configuration.stack().pop().get<Value>().to<pop_type>()); \
dbgln_if(WASM_TRACE_DEBUG, "stack({}) -> temporary({}b)", value, sizeof(store_type)); \
store_to_memory(configuration, instruction, { &value, sizeof(store_type) }); \
return; \
#define POP_AND_STORE(pop_type, store_type) \
do { \
auto value = ConvertToRaw<store_type> {}(*configuration.stack().pop().get<Value>().to<pop_type>()); \
dbgln_if(WASM_TRACE_DEBUG, "stack({}) -> temporary({}b)", value, sizeof(store_type)); \
store_to_memory(configuration, instruction, { &value, sizeof(store_type) }); \
return; \
} while (false)
template<typename T>
T BytecodeInterpreter::read_value(ReadonlyBytes data)
{
T value;
LittleEndian<T> value;
InputMemoryStream stream { data };
auto ok = IsSigned<T> ? LEB128::read_signed(stream, value) : LEB128::read_unsigned(stream, value);
if (stream.handle_any_error() || !ok)
stream >> value;
if (stream.handle_any_error()) {
dbgln("Read from {} failed", data.data());
m_do_trap = true;
}
return value;
}
@ -258,7 +256,7 @@ template<typename T>
struct ConvertToRaw {
T operator()(T value)
{
return value;
return LittleEndian<T>(value);
}
};