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LibJS/JIT: Update "unwind context" stack in JIT code
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.
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298dfa96a4
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cfdb8a2756
7 changed files with 60 additions and 7 deletions
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@ -560,14 +560,25 @@ void Compiler::check_exception()
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}
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}
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static void cxx_enter_unwind_context(VM& vm)
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{
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vm.bytecode_interpreter().enter_unwind_context();
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}
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void Compiler::compile_enter_unwind_context(Bytecode::Op::EnterUnwindContext const& op)
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{
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native_call((void*)cxx_enter_unwind_context);
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m_assembler.jump(label_for(op.entry_point().block()));
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}
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static void cxx_leave_unwind_context(VM& vm)
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{
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vm.bytecode_interpreter().leave_unwind_context();
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}
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void Compiler::compile_leave_unwind_context(Bytecode::Op::LeaveUnwindContext const&)
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{
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/* Nothing */
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native_call((void*)cxx_leave_unwind_context);
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}
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void Compiler::compile_throw(Bytecode::Op::Throw const&)
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@ -577,6 +588,16 @@ void Compiler::compile_throw(Bytecode::Op::Throw const&)
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check_exception();
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}
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static void cxx_catch(VM& vm)
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{
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vm.bytecode_interpreter().catch_exception();
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}
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void Compiler::compile_catch(Bytecode::Op::Catch const&)
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{
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native_call((void*)cxx_catch);
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}
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static ThrowCompletionOr<Value> loosely_inequals(VM& vm, Value src1, Value src2)
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{
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return Value(!TRY(is_loosely_equal(vm, src1, src2)));
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