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LibWasm: Make blocks that take arguments actually work

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Previously we were ignoring the actual parameters and setting the arity
to an incorrect value, which could cause crashes (or unexpected traps).
This commit is contained in:
Ali Mohammad Pur
2021-12-04 17:57:48 +03:30
committed by Ali Mohammad Pur
parent b5ca290605
commit fecbf0e03a
2 changed files with 52 additions and 8 deletions
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11
Userland/Libraries/LibWasm/AbstractMachine/Validator.cpp
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@@ -2424,11 +2424,14 @@ VALIDATE_INSTRUCTION(block)
if (stack.size() < parameters.size())
return Errors::invalid_stack_state();
for (size_t i = 0; i < parameters.size(); ++i) {
for (size_t i = 1; i <= parameters.size(); ++i) {
if (stack.take_last() != parameters[parameters.size() - i])
return Errors::invalid_stack_state();
}
for (auto& parameter : parameters)
stack.append(parameter);
m_entered_scopes.append(ChildScopeKind::Block);
m_block_details.empend(stack.actual_size(), Empty {});
m_parent_contexts.append(m_context);
@@ -2451,6 +2454,9 @@ VALIDATE_INSTRUCTION(loop)
return Errors::invalid_stack_state();
}
for (auto& parameter : parameters)
stack.append(parameter);
m_entered_scopes.append(ChildScopeKind::Block);
m_block_details.empend(stack.actual_size(), Empty {});
m_parent_contexts.append(m_context);
@@ -2476,6 +2482,9 @@ VALIDATE_INSTRUCTION(if_)
return Errors::invalid_stack_state();
}
for (auto& parameter : parameters)
stack.append(parameter);
m_entered_scopes.append(args.else_ip.has_value() ? ChildScopeKind::IfWithElse : ChildScopeKind::IfWithoutElse);
m_block_details.empend(stack.actual_size(), BlockDetails::IfDetails { stack, {} });
m_parent_contexts.append(m_context);