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LibWasm: Give traps a reason and display it when needed

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This makes debugging wasm code a bit easier, as we now know what fails
instead of just "too bad, something went wrong".
This commit is contained in:
Ali Mohammad Pur 2021-07-01 17:03:17 +04:30 • committed by Ali Mohammad Pur
parent 62ca81fdcc
commit b538e15548
10 changed files with 54 additions and 50 deletions
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19
Userland/Libraries/LibWasm/AbstractMachine/AbstractMachine.h
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@ -193,28 +193,29 @@ private:
};
struct Trap {
// Empty value type
String reason;
};
class Result {
public:
explicit Result(Vector<Value> values)
: m_values(move(values))
: m_result(move(values))
{
}
Result(Trap)
: m_is_trap(true)
Result(Trap trap)
: m_result(move(trap))
{
}
auto& values() const { return m_values; }
auto& values() { return m_values; }
auto is_trap() const { return m_is_trap; }
auto is_trap() const { return m_result.has<Trap>(); }
auto& values() const { return m_result.get<Vector<Value>>(); }
auto& values() { return m_result.get<Vector<Value>>(); }
auto& trap() const { return m_result.get<Trap>(); }
auto& trap() { return m_result.get<Trap>(); }
private:
Vector<Value> m_values;
bool m_is_trap { false };
Variant<Vector<Value>, Trap> m_result;
};
using ExternValue = Variant<FunctionAddress, TableAddress, MemoryAddress, GlobalAddress>;