• Simon Zünd's avatar
    Introduce REPL mode · fbcc2e87
    Simon Zünd authored
    Design doc: bit.ly/v8-repl-mode
    
    This CL adds a new REPL mode that can be used via
    DebugEvaluate::GlobalREPL. REPL mode only implements re-declaration
    of 'let' bindings at the moment. Example:
    
    REPL Input 1: let x = 21;
    REPL Input 2: let x = 42;
    
    This would normally throw a SyntaxError, but works in REPL mode.
    
    The implementation is done by:
      - Setting a 'repl mode' bit on {Script}, {ScopeInfo}, {ParseInfo}
        and script {Scope}.
      - Each global let declaration still gets a slot reserved in the
        respective {ScriptContext}.
      - When a new REPL mode {ScriptContext} is created, name clashes
        for let bindings are not reported as errors.
      - Declarations, loads and stores for global let in REPL mode are
        now "load/store global" instead of accessing their respective
        context slot directly. This causes a lookup in the ScriptContextTable
        where the found slot for each name is guaranteed to be the same
        (the first one).
    
    Bug: chromium:1004193, chromium:1018158
    Change-Id: Ia6ab526b9f696400dbb8bfb611a4d43606119a47
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876061
    Commit-Queue: Simon Zünd <szuend@chromium.org>
    Reviewed-by: 's avatarRoss McIlroy <rmcilroy@chromium.org>
    Reviewed-by: 's avatarToon Verwaest <verwaest@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#64793}
    fbcc2e87
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