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LibJS/JIT: Update "unwind context" stack in JIT code

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Until now, the unwind context stack has not been maintained by jitted
code, which meant we were unable to support the `with` statement.
This is a first step towards supporting that by making jitted code
call out to C++ to update the unwind context stack when entering/leaving
unwind contexts.

We also introduce a new "Catch" bytecode instruction that moves the
current exception into the accumulator. It's always emitted at the start
of a "catch" block.
This commit is contained in:
Andreas Kling 2023-11-11 23:19:46 +01:00
parent 298dfa96a4
commit cfdb8a2756
7 changed files with 60 additions and 7 deletions
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11
Userland/Libraries/LibJS/Bytecode/Op.h
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@ -407,6 +407,17 @@ public:
DeprecatedString to_deprecated_string_impl(Bytecode::Executable const&) const;
};
class Catch final : public Instruction {
public:
explicit Catch()
: Instruction(Type::Catch, sizeof(*this))
{
}
ThrowCompletionOr<void> execute_impl(Bytecode::Interpreter&) const;
DeprecatedString to_deprecated_string_impl(Bytecode::Executable const&) const;
};
class CreateVariable final : public Instruction {
public:
explicit CreateVariable(IdentifierTableIndex identifier, EnvironmentMode mode, bool is_immutable, bool is_global = false, bool is_strict = false)