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package com.oracle.truffle.sl.nodes.local;
import com.oracle.truffle.api.dsl.Fallback;
import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.NodeField;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.FrameSlot;
import com.oracle.truffle.api.frame.FrameSlotKind;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrumentation.StandardTags.WriteVariableTag;
import com.oracle.truffle.api.instrumentation.Tag;
import com.oracle.truffle.api.source.Source;
import com.oracle.truffle.api.source.SourceSection;
import com.oracle.truffle.sl.nodes.SLExpressionNode;
import com.oracle.truffle.sl.nodes.interop.NodeObjectDescriptor;
/**
* Node to write a local variable to a function's {@link VirtualFrame frame}. The Truffle frame API
* allows to store primitive values of all Java primitive types, and Object values.
*/
@NodeChild("valueNode")
@NodeField(name = "slot", type = FrameSlot.class)
@NodeField(name = "nameNode", type = SLExpressionNode.class)
@NodeField(name = "declaration", type = boolean.class)
public abstract class SLWriteLocalVariableNode extends SLExpressionNode {
/**
* Returns the descriptor of the accessed local variable. The implementation of this method is
* created by the Truffle DSL based on the {@link NodeField} annotation on the class.
*/
protected abstract FrameSlot getSlot();
/**
* Returns the child node nameNode. The implementation of this method is created by
* the Truffle DSL based on the {@link NodeChild} annotation on the class.
*/
protected abstract SLExpressionNode getNameNode();
public abstract boolean isDeclaration();
/**
* Specialized method to write a primitive {@code long} value. This is only possible if the
* local variable also has currently the type {@code long} or was never written before,
* therefore a Truffle DSL {@link #isLongOrIllegal(VirtualFrame) custom guard} is specified.
*/
@Specialization(guards = "isLongOrIllegal(frame)")
protected long writeLong(VirtualFrame frame, long value) {
/* Initialize type on first write of the local variable. No-op if kind is already Long. */
frame.getFrameDescriptor().setFrameSlotKind(getSlot(), FrameSlotKind.Long);
frame.setLong(getSlot(), value);
return value;
}
@Specialization(guards = "isBooleanOrIllegal(frame)")
protected boolean writeBoolean(VirtualFrame frame, boolean value) {
/* Initialize type on first write of the local variable. No-op if kind is already Long. */
frame.getFrameDescriptor().setFrameSlotKind(getSlot(), FrameSlotKind.Boolean);
frame.setBoolean(getSlot(), value);
return value;
}
/**
* Generic write method that works for all possible types.
*
* Why is this method annotated with {@link Specialization} and not {@link Fallback}? For a
* {@link Fallback} method, the Truffle DSL generated code would try all other specializations
* first before calling this method. We know that all these specializations would fail their
* guards, so there is no point in calling them. Since this method takes a value of type
* {@link Object}, it is guaranteed to never fail, i.e., once we are in this specialization the
* node will never be re-specialized.
*/
@Specialization(replaces = {"writeLong", "writeBoolean"})
protected Object write(VirtualFrame frame, Object value) {
/*
* Regardless of the type before, the new and final type of the local variable is Object.
* Changing the slot kind also discards compiled code, because the variable type is
* important when the compiler optimizes a method.
*
* No-op if kind is already Object.
*/
frame.getFrameDescriptor().setFrameSlotKind(getSlot(), FrameSlotKind.Object);
frame.setObject(getSlot(), value);
return value;
}
public abstract void executeWrite(VirtualFrame frame, Object value);
/**
* Guard function that the local variable has the type {@code long}.
*
* @param frame The parameter seems unnecessary, but it is required: Without the parameter, the
* Truffle DSL would not check the guard on every execution of the specialization.
* Guards without parameters are assumed to be pure, but our guard depends on the
* slot kind which can change.
*/
protected boolean isLongOrIllegal(VirtualFrame frame) {
final FrameSlotKind kind = frame.getFrameDescriptor().getFrameSlotKind(getSlot());
return kind == FrameSlotKind.Long || kind == FrameSlotKind.Illegal;
}
protected boolean isBooleanOrIllegal(VirtualFrame frame) {
final FrameSlotKind kind = frame.getFrameDescriptor().getFrameSlotKind(getSlot());
return kind == FrameSlotKind.Boolean || kind == FrameSlotKind.Illegal;
}
@Override
public boolean hasTag(Class tag) {
return tag == WriteVariableTag.class || super.hasTag(tag);
}
@Override
public Object getNodeObject() {
SLExpressionNode nameNode = getNameNode();
SourceSection nameSourceSection;
if (nameNode.getSourceCharIndex() == -1) {
nameSourceSection = null;
} else {
SourceSection rootSourceSection = getRootNode().getSourceSection();
if (rootSourceSection == null) {
nameSourceSection = null;
} else {
Source source = rootSourceSection.getSource();
nameSourceSection = source.createSection(nameNode.getSourceCharIndex(), nameNode.getSourceLength());
}
}
return NodeObjectDescriptor.writeVariable(getSlot().getIdentifier().toString(), nameSourceSection);
}
}