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LibJS: Add basic support for "continue" in the bytecode VM

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Unlike the convoluted unwind-until-scope-type mechanism in the AST
interpreter, "continue" maps to a simple Bytecode::Op::Jump here. :^)

We know where to jump based on a stack of "continuable scopes" that
we now maintain on the Bytecode::Generator as we go.

Note that this only supports bare "continue", not continue-with-label.
This commit is contained in:
Andreas Kling 2021-06-06 13:33:02 +02:00
parent 79eac08f5b
commit 4bdfe73895
4 changed files with 32 additions and 0 deletions
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6
Userland/Libraries/LibJS/Bytecode/Generator.h
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@ -29,6 +29,11 @@ public:
Label make_label() const;
void begin_continuable_scope();
void end_continuable_scope();
Label nearest_continuable_scope() const;
private:
Generator();
~Generator();
@ -37,6 +42,7 @@ private:
OwnPtr<Block> m_block;
u32 m_next_register { 1 };
Vector<Label> m_continuable_scopes;
};
}