96 lines
2.8 KiB
Rust
96 lines
2.8 KiB
Rust
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//! Activation records
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use std::sync::Arc;
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use std::cell::{Ref, RefMut};
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use gc_arena::{GcCell, MutationContext};
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use crate::tag_utils::SwfSlice;
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use crate::avm1::scope::Scope;
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use crate::avm1::Value;
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/// Represents a single activation of a given AVM1 function or keyframe.
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pub struct Activation<'gc> {
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/// Represents the SWF version of a given function.
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///
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/// Certain AVM1 operations change behavior based on the version of the SWF
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/// file they were defined in. For example, case sensitivity changes based
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/// on the SWF version.
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swf_version: u8,
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/// Action data being executed by the reader below.
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data: SwfSlice,
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/// The current location of the instruction stream being executed.
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pc: usize,
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/// All defined local variables in this stack frame.
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scope: GcCell<'gc, Scope<'gc>>,
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}
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unsafe impl<'gc> gc_arena::Collect for Activation<'gc> {
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#[inline]
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fn trace(&self, cc: gc_arena::CollectionContext) {
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self.scope.trace(cc);
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}
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}
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impl<'gc> Activation<'gc> {
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pub fn from_action(swf_version: u8, code: SwfSlice, scope: GcCell<'gc, Scope<'gc>>) -> Activation<'gc> {
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Activation {
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swf_version: swf_version,
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data: code,
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pc: 0,
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scope: scope
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}
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}
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/// Returns the SWF version of the action or function being executed.
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pub fn swf_version(&self) -> u8 {
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self.swf_version
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}
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/// Returns the data this stack frame executes from.
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pub fn data(&self) -> SwfSlice {
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self.data.clone()
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}
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/// Determines if a stack frame references the same function as a given
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/// SwfSlice.
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pub fn is_identical_fn(&self, other: &SwfSlice) -> bool {
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Arc::ptr_eq(&self.data.data, &other.data)
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}
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/// Returns a mutable reference to the current data offset.
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pub fn pc(&self) -> usize {
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self.pc
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}
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/// Change the current PC.
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pub fn set_pc(&mut self, new_pc: usize) {
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self.pc = new_pc;
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}
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/// Returns AVM local variable scope.
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pub fn scope(&self) -> Ref<Scope<'gc>> {
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self.scope.read()
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}
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/// Returns AVM local variable scope for mutation.
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pub fn scope_mut(&mut self, mc: MutationContext<'gc, '_>) -> RefMut<Scope<'gc>> {
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self.scope.write(mc)
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}
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/// Resolve a particular named local variable within this activation.
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pub fn resolve(&self, name: &str) -> Value<'gc> {
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self.scope().resolve(name)
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}
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/// Check if a particular property in the scope chain is defined.
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pub fn is_defined(&self, name: &str) -> bool {
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self.scope().is_defined(name)
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}
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/// Define a named local variable within this activation.
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pub fn define(&self, name: &str, value: Value<'gc>, mc: MutationContext<'gc, '_>) {
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self.scope().define(name, value, mc)
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}
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}
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