RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-26 05:47:34 +00:00
Code Issues Activity Actions

LibWasm: Fix nested structured instruction parsing

Browse source 
Previously, the ip would not be propagated correctly, and we would
produce invalid jumps when more than one level of nesting was involved.
This makes loops work :P
This commit is contained in:
Ali Mohammad Pur 2021-05-18 00:23:41 +04:30 • committed by Linus Groh
parent 29b193d25d
commit 207379165f
2 changed files with 12 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

9
Userland/Libraries/LibWasm/Parser/Parser.cpp
View file

@ -82,7 +82,7 @@ struct ParseUntilAnyOfResult {
Vector<T> values;
};
template<typename T, u8... terminators, typename... Args>
static ParseResult<ParseUntilAnyOfResult<T>> parse_until_any_of(InputStream& stream, Args... args) requires(requires(InputStream& stream, Args... args) { T::parse(stream, args...); })
static ParseResult<ParseUntilAnyOfResult<T>> parse_until_any_of(InputStream& stream, Args&... args) requires(requires(InputStream& stream, Args... args) { T::parse(stream, args...); })
{
ScopeLogger<WASM_BINPARSER_DEBUG> logger;
ReconsumableStream new_stream { stream };
@ -305,7 +305,8 @@ ParseResult<Vector<Instruction>> Instruction::parse(InputStream& stream, Instruc
result.value().values.append(Instruction { Instructions::structured_end });
// Transform op(..., instr*) -> op(...) instr* op(end(ip))
result.value().values.prepend(Instruction { opcode, StructuredInstructionArgs { BlockType { block_type.release_value() }, ++ip, {} } });
result.value().values.prepend(Instruction { opcode, StructuredInstructionArgs { BlockType { block_type.release_value() }, ip.value(), {} } });
++ip;
return result.release_value().values;
}
@ -314,7 +315,7 @@ ParseResult<Vector<Instruction>> Instruction::parse(InputStream& stream, Instruc
instructions.append(result.release_value().values);
instructions.append(Instruction { Instructions::structured_else });
++ip;
else_ip = ip;
else_ip = ip.value();
}
// if with else
{
@ -324,7 +325,7 @@ ParseResult<Vector<Instruction>> Instruction::parse(InputStream& stream, Instruc
instructions.append(result.release_value().values);
instructions.append(Instruction { Instructions::structured_end });
++ip;
end_ip = ip;
end_ip = ip.value();
}
instructions.prepend(Instruction { opcode, StructuredInstructionArgs { BlockType { block_type.release_value() }, end_ip, else_ip } });