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LibJS: Implement async functions as generator functions in BC mode
This applies a simple transformation, and adds a simple wrapper that translates the generator interface to the async function interface.
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14 changed files with 192 additions and 43 deletions
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@ -17,12 +17,13 @@
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#include <LibJS/Bytecode/Register.h>
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#include <LibJS/Bytecode/StringTable.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Runtime/FunctionKind.h>
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namespace JS::Bytecode {
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class Generator {
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public:
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static Executable generate(ASTNode const&, bool is_in_generator_function = false);
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static Executable generate(ASTNode const&, FunctionKind = FunctionKind::Regular);
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Register allocate_register();
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@ -111,9 +112,9 @@ public:
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return m_identifier_table->insert(move(string));
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}
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bool is_in_generator_function() const { return m_is_in_generator_function; }
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void enter_generator_context() { m_is_in_generator_function = true; }
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void leave_generator_context() { m_is_in_generator_function = false; }
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bool is_in_generator_or_async_function() const { return m_enclosing_function_kind == FunctionKind::Async || m_enclosing_function_kind == FunctionKind::Generator; }
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bool is_in_generator_function() const { return m_enclosing_function_kind == FunctionKind::Generator; }
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bool is_in_async_function() const { return m_enclosing_function_kind == FunctionKind::Async; }
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private:
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Generator();
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@ -129,7 +130,7 @@ private:
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u32 m_next_register { 2 };
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u32 m_next_block { 1 };
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bool m_is_in_generator_function { false };
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FunctionKind m_enclosing_function_kind { FunctionKind::Regular };
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Vector<Label> m_continuable_scopes;
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Vector<Label> m_breakable_scopes;
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};
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