Trees
Related Doc:
package ir
Apply an instance method with dynamic dispatch (the default).
Apply a static method.
Apply an instance method with static dispatch (e.g., super calls).
Binary operation (always preserves pureness).
Closure with explicit captures.
Closure with explicit captures.
If true, the closure is an Arrow Function (=>), which does not have
an this parameter, and cannot be constructed (called with new).
If false, it is a regular Function (function).
Creates a JavaScript class value.
Creates a JavaScript class value.
Reference to the ClassDef for the class definition, which must have
jsClassCaptures.nonEmpty
Actual values for the captured parameters (in the ClassDef's
jsClassCaptures.get)
Base class for all nodes in the IR.
Base class for all nodes in the IR.
Usually, one of the direct subclasses of IRNode should be used instead.
Binary operation (always preserves pureness).
Binary operation (always preserves pureness).
Operations which do not preserve pureness are not allowed in this tree. These are notably +=, -=, *=, /= and %=
Loading specification for a native JS class or object.
...items, the "spread" operator of ECMAScript 6.
...items, the "spread" operator of ECMAScript 6.
It is only valid in the args/items of a JSNew, JSFunctionApply,
JSDotMethodApply, JSBracketMethodApply, or JSArrayConstr.
An Array whose items will be spread (not an arbitrary iterable)
Calls a method inherited from the given superClass on receiver.
Calls a method inherited from the given superClass on receiver.
Intuitively, this corresponds to
superClass.prototype[method].call(receiver, ...args)
but retains more structure at the IR level than using an explicit encoding of the above expression.
Given the non-native JS classes
class Bar extends js.Object class Foo extends Bar
The node
JSSuperBrackerCall(LoadJSConstructor(ClassRef(Bar)), receiver, method, args)
which is printed as
super(constructorOf[Bar])::receiver[method](...args)has the following semantics:
Bar.prototype[method].call(receiver, ...args)
If this happens to be located in an instance method of Foo, *and*
receiver happens to be This(), this is equivalent to the ES6
statement
super[method](...args)
Selects a property inherited from the given superClass on receiver.
Selects a property inherited from the given superClass on receiver.
Given the non-native JS classes
class Bar extends js.Object class Foo extends Bar
The node
JSSuperBrackerSelect(LoadJSConstructor(ClassRef(Bar)), qualifier, item)
which is printed as
super(constructorOf[Bar])::qualifier[item]has the semantics of an ES6 super reference
super[item] as if it were in an instance method of Foo with qualifier as the
this value.
Super constructor call in the constructor of a non-native JS class.
Super constructor call in the constructor of a non-native JS class.
Exactly one such node must appear in the constructor of a
non-native JS class, at the top-level (possibly as a direct child
of a top-level Block). Any other use of this node is invalid.
Statements before this node, as well as the args, cannot contain any
This() node. Statements after this node can use This().
After the execution of this node, it is guaranteed that all fields declared in the current class have been created and initialized. Up to that point, accessing any field declared in this class (e.g., through an overridden method called from the super constructor) is undefined behavior.
All in all, the shape of a constructor is therefore:
{
statementsNotUsingThis();
JSSuperConstructorCall(...argsNotUsingThis);
statementsThatMayUseThis()
}which currently translates to something of the following shape:
{
statementsNotUsingThis();
super(...argsNotUsingThis);
this.privateField1 = 0;
this["publicField2"] = false;
statementsThatMayUseThis()
}
Unary operation (always preserves pureness).
Unary operation (always preserves pureness).
Operations which do not preserve pureness are not allowed in this tree. These are notably ++ and --
Marker for literals.
Marker for literals. Literals are always pure.
Loads the constructor of a JS class (native or not).
Loads the constructor of a JS class (native or not).
cls must represent a non-trait JS class (native or not).
This is used typically to instantiate a JS class, and most importantly if it is a non-native JS class. Given the class
class Foo(x: Int) extends js.Object
The instantiation new Foo(1) would be represented as
JSNew(LoadJSConstructor(ClassRef("Foo")), List(IntLiteral(1)))
This node is also useful to encode o.isInstanceOf[Foo]:
JSBinaryOp(instanceof, o, LoadJSConstructor(ClassRef("Foo"))) If Foo is non-native, the presence of this node makes it instantiable,
and therefore reachable.
Like LoadModule but for a JS module class.
A break-free switch (without fallthrough behavior).
A break-free switch (without fallthrough behavior).
Unlike a JavaScript switch, it can be used in expression position.
It supports alternatives explicitly (hence the List[IntLiteral] in
cases), whereas in a switch one would use the fallthrough behavior to
implement alternatives.
(This is not a pattern matching construct like in Scala.)
Export for a top-level object.
Export for a top-level object.
This exports the singleton instance of the containing module class. The instance is initialized during ES module instantiation.
A transient node for custom purposes.
A transient node for custom purposes.
A transient node is never a valid input to the Serializers nor to the linker, but can be used in a transient state for internal purposes.
The payload of the transient node, without any specified meaning.
Node for a statement or expression in the IR.
A hash of a tree (usually a MethodDef).
A hash of a tree (usually a MethodDef).
Contains a SHA-1 hash.
Either a Tree or a JSSpread.
Either a Tree or a JSSpread.
This is the type of actual arguments to JS applications.
Unary operation (always preserves pureness).