avm1: Fix scope of function calls in SWFv5 vs. SWFv6+
Fix various scope behavior when executing a function: * For function calls in SWFv6+, functions are proper closures and close over the SWF version, base clip, and scope of their defining function. * Function calls in SWFv5 are not closures, and use the version, base clip, and scope of `this` when the function is called. Fixes #5502.
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@ -224,9 +224,57 @@ impl<'gc> Executable<'gc> {
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nf(activation, this, args)
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}
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Executable::Action(af) => {
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let this_obj = match this {
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Value::Object(obj) => Some(obj),
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_ => None,
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};
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let target = activation.target_clip_or_root();
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let (swf_version, base_clip, parent_scope) = if activation.swf_version() >= 6 {
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// Function calls in a v6+ SWF are proper closures, and "close" over the scope that defined the function:
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// * Use the SWF version from the SWF that defined the function.
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// * Use the base clip from when the function was defined.
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// * Close over the scope from when the function was defined.
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let base_clip = if !af.base_clip.removed() {
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af.base_clip
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} else {
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this_obj
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.and_then(|this| this.as_display_object())
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.unwrap_or(target)
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};
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(af.swf_version(), base_clip, af.scope())
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} else {
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// Function calls in a v5 SWF are *not* closures, and will use the settings of
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// `this`, regardless of the function's origin:
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// * Use the SWF version of `this`.
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// * Use the base clip of `this`.
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// * Allocate a new scope using the given base clip. No previous scope is closed over.
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let base_clip = this_obj
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.and_then(|this| this.as_display_object())
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.unwrap_or(target);
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let swf_version = base_clip.swf_version();
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let base_clip_obj = match base_clip.object() {
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Value::Object(o) => o,
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_ => unreachable!(),
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};
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// TODO: It would be nice to avoid these extra Scope allocs.
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let scope = GcCell::allocate(
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activation.context.gc_context,
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Scope::new(
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GcCell::allocate(
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activation.context.gc_context,
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Scope::from_global_object(activation.context.avm1.globals),
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),
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super::scope::ScopeClass::Target,
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base_clip_obj,
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),
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);
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(swf_version, base_clip, scope)
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};
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let child_scope = GcCell::allocate(
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activation.context.gc_context,
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Scope::new_local_scope(af.scope(), activation.context.gc_context),
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Scope::new_local_scope(parent_scope, activation.context.gc_context),
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);
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let arguments = if af.flags.contains(FunctionFlags::SUPPRESS_ARGUMENTS) {
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@ -252,11 +300,6 @@ impl<'gc> Executable<'gc> {
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Attribute::DONT_ENUM,
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);
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let this_obj = match this {
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Value::Object(obj) => Some(obj),
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_ => None,
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};
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// TODO: `super` should only be defined if this was a method call (depth > 0?)
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// `f[""]()` emits a CallMethod op, causing `this` to be undefined, but `super` is a function; what is it?
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let super_object: Option<Object<'gc>> = this_obj.and_then(|this| {
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@ -267,19 +310,6 @@ impl<'gc> Executable<'gc> {
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}
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});
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let effective_version = if activation.swf_version() > 5 {
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if !af.base_clip.removed() {
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af.base_clip.swf_version()
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} else {
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af.swf_version()
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}
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} else {
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this_obj
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.and_then(|this| this.as_display_object())
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.map(|dn| dn.swf_version())
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.unwrap_or(activation.context.player_version)
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};
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let name = if cfg!(feature = "avm_debug") {
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let mut result = match af.name.map(ExecutionName::Dynamic).unwrap_or(name) {
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ExecutionName::Static(n) => n.to_owned(),
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@ -301,17 +331,10 @@ impl<'gc> Executable<'gc> {
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};
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let max_recursion_depth = activation.context.avm1.max_recursion_depth();
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let base_clip = if effective_version > 5 && !af.base_clip.removed() {
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af.base_clip
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} else {
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this_obj
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.and_then(|this| this.as_display_object())
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.unwrap_or_else(|| activation.base_clip())
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};
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let mut frame = Activation::from_action(
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activation.context.reborrow(),
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activation.id.function(name, reason, max_recursion_depth)?,
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effective_version,
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swf_version,
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child_scope,
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af.constant_pool,
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base_clip,
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