RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 20:07:35 +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

11
Userland/Libraries/LibWasm/AbstractMachine/Interpreter.cpp
View file

@ -28,10 +28,12 @@ void Interpreter::interpret(Configuration& configuration)
while (current_ip_value < max_ip_value) {
auto& instruction = instructions[current_ip_value.value()];
auto old_ip = current_ip_value;
interpret(configuration, current_ip_value, instruction);
if (m_do_trap)
return;
++current_ip_value;
if (current_ip_value == old_ip) // If no jump occurred
++current_ip_value;
}
}
@ -46,18 +48,19 @@ void Interpreter::branch_to_label(Configuration& configuration, LabelIndex index
size_t drop_count = index.value() + 1;
for (; !configuration.stack().is_empty();) {
auto entry = configuration.stack().pop();
auto& entry = configuration.stack().peek();
if (entry.has<NonnullOwnPtr<Label>>()) {
if (drop_count-- == 0)
break;
}
configuration.stack().pop();
}
// Push results in reverse
for (size_t i = results.size(); i > 0; --i)
configuration.stack().push(move(static_cast<Vector<NonnullOwnPtr<Value>>&>(results)[i - 1]));
configuration.ip() = label->continuation() + 1;
configuration.ip() = label->continuation();
}
ReadonlyBytes Interpreter::load_from_memory(Configuration& configuration, const Instruction& instruction, size_t size)
@ -321,7 +324,7 @@ void Interpreter::interpret(Configuration& configuration, InstructionPointer& ip
auto& args = instruction.arguments().get<Instruction::StructuredInstructionArgs>();
if (args.block_type.kind() != BlockType::Empty)
arity = 1;
configuration.stack().push(make<Label>(arity, ip.value() + 1));
configuration.stack().push(make<Label>(arity, ip.value()));
return;
}
case Instructions::if_.value(): {