2019-09-17 04:04:38 +00:00
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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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2019-09-19 01:55:28 +00:00
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use crate::avm1::object::Object;
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2019-09-17 04:04:38 +00:00
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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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2019-09-23 01:10:49 +00:00
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#[derive(Clone)]
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2019-09-17 04:04:38 +00:00
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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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/// The immutable value of `this`.
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this: GcCell<'gc, Object<'gc>>,
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/// The arguments this function was called by.
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2019-09-23 02:47:55 +00:00
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arguments: Option<GcCell<'gc, Object<'gc>>>,
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/// Indicates if this activation object represents a function or embedded
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/// block (e.g. ActionWith).
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is_function: bool,
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/// Local registers, if any.
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///
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/// None indicates a function executing out of the global register set.
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/// Some indicates the existence of local registers, even if none exist.
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/// i.e. None(Vec::new()) means no registers should exist at all.
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///
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/// Registers are numbered from 1; r0 does not exist. Therefore this vec,
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/// while nominally starting from zero, actually starts from r1.
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///
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/// Registers are stored in a `GcCell` so that rescopes (e.g. with) use the
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/// same register set.
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local_registers: Option<GcCell<'gc, Vec<Value<'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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self.this.trace(cc);
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self.arguments.trace(cc);
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self.local_registers.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>>, this: GcCell<'gc, Object<'gc>>, arguments: Option<GcCell<'gc, Object<'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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this: this,
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arguments: arguments,
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is_function: false,
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local_registers: None
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}
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}
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pub fn from_function(swf_version: u8, code: SwfSlice, scope: GcCell<'gc, Scope<'gc>>, this: GcCell<'gc, Object<'gc>>, arguments: Option<GcCell<'gc, Object<'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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this: this,
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arguments: arguments,
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is_function: true,
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local_registers: None
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}
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}
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2019-09-23 01:10:49 +00:00
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/// Create a new activation to run a block of code with a given scope.
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pub fn to_rescope(&self, code: SwfSlice, scope: GcCell<'gc, Scope<'gc>>) -> Self {
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Activation {
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swf_version: self.swf_version,
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data: code,
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pc: 0,
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scope: scope,
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this: self.this,
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arguments: self.arguments,
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is_function: false,
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local_registers: self.local_registers.clone()
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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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/// Change the data being executed.
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pub fn set_data(&mut self, new_data: SwfSlice) {
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self.data = new_data;
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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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2019-09-22 01:41:30 +00:00
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/// Returns AVM local variable scope for reference.
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pub fn scope_cell(&self) -> GcCell<'gc, Scope<'gc>> {
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self.scope.clone()
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}
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2019-09-23 02:47:55 +00:00
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/// Indicates whether or not the end of this scope should be handled as an
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/// implicit function return or the end of a block.
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pub fn can_implicit_return(&self) -> bool {
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self.is_function
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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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if name == "this" {
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return Value::Object(self.this);
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}
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if name == "arguments" && self.arguments.is_some() {
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return Value::Object(self.arguments.unwrap());
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}
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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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if name == "this" {
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return true;
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}
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2019-09-21 22:37:44 +00:00
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if name == "arguments" && self.arguments.is_some() {
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return true;
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}
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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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2019-09-22 01:41:30 +00:00
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/// Returns value of `this` as a reference.
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pub fn this_cell(&self) -> GcCell<'gc, Object<'gc>> {
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self.this
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}
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/// Returns true if this function was called with a local register set.
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pub fn has_local_registers(&self) -> bool {
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self.local_registers.is_some()
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}
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2019-09-29 03:11:03 +00:00
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pub fn allocate_local_registers(&mut self, num: u8, mc: MutationContext<'gc, '_>) {
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self.local_registers = Some(GcCell::allocate(mc, vec![Value::Undefined; num as usize]));
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}
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2019-09-27 00:02:40 +00:00
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/// Retrieve a local register.
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pub fn local_register(&self, id: u8) -> Value<'gc> {
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if let Some(local_registers) = self.local_registers {
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local_registers.read().get(id as usize).map(|v| v.clone()).unwrap_or(Value::Undefined)
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} else {
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Value::Undefined
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}
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}
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/// Set a local register.
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pub fn set_local_register(&mut self, id: u8, value: Value<'gc>, mc: MutationContext<'gc, '_>) {
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if let Some(ref mut local_registers) = self.local_registers {
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local_registers.write(mc).get_mut(id as usize).map(|r| *r = value);
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}
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}
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2019-09-17 04:04:38 +00:00
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}
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