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LibWasm: Fix nested structured instruction parsing

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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
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9
Userland/Libraries/LibWasm/Parser/Parser.cpp
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@ -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 } });