com.oracle.graal.python.nodes.frame.GetCurrentFrameRef Maven / Gradle / Ivy
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package com.oracle.graal.python.nodes.frame;
import com.oracle.graal.python.PythonLanguage;
import com.oracle.graal.python.builtins.objects.frame.PFrame;
import com.oracle.graal.python.builtins.objects.frame.PFrame.Reference;
import com.oracle.graal.python.builtins.objects.function.PArguments;
import com.oracle.graal.python.runtime.PythonContext;
import com.oracle.graal.python.util.PythonUtils;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.GenerateCached;
import com.oracle.truffle.api.dsl.GenerateInline;
import com.oracle.truffle.api.dsl.GenerateUncached;
import com.oracle.truffle.api.dsl.NeverDefault;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.Frame;
import com.oracle.truffle.api.frame.FrameInstance;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.profiles.ConditionProfile;
/**
* This node retrieves the frame reference ({@link Reference}) of the current Python frame
* regardless if a frame is available or not.
*/
@GenerateUncached
@GenerateInline
@GenerateCached(false)
public abstract class GetCurrentFrameRef extends Node {
public abstract Reference execute(Frame frame, Node inliningTarget);
@Specialization(guards = "frame != null")
static Reference doWithFrame(Frame frame) {
return PArguments.getCurrentFrameInfo(frame);
}
@Specialization(guards = "frame == null")
Reference doWithoutFrame(@SuppressWarnings("unused") Frame frame,
@Cached(value = "getFlag()", uncached = "getFlagUncached()", dimensions = 1) ConditionProfile[] flag) {
PFrame.Reference ref = PythonContext.get(this).peekTopFrameInfo(PythonLanguage.get(this));
if (flag[0] == null) {
CompilerDirectives.transferToInterpreterAndInvalidate();
// executed the first time, don't pollute the profile, we'll mark the caller to
// pass the info on the next call
flag[0] = ConditionProfile.create();
if (ref == null) {
ref = PArguments.getCurrentFrameInfo(ReadCallerFrameNode.getCurrentFrame(this, FrameInstance.FrameAccess.READ_ONLY));
}
}
if (flag[0].profile(ref == null)) {
ref = PArguments.getCurrentFrameInfo(ReadCallerFrameNode.getCurrentFrame(this, FrameInstance.FrameAccess.READ_ONLY));
}
return ref;
}
@Specialization(replaces = {"doWithFrame", "doWithoutFrame"})
Reference doGeneric(Frame frame) {
PFrame.Reference ref;
if (frame == null) {
ref = PythonContext.get(this).peekTopFrameInfo(PythonLanguage.get(this));
if (ref == null) {
return PArguments.getCurrentFrameInfo(ReadCallerFrameNode.getCurrentFrame(this, FrameInstance.FrameAccess.READ_ONLY));
}
return ref;
}
return PArguments.getCurrentFrameInfo(frame);
}
@NeverDefault
static ConditionProfile[] getFlag() {
return new ConditionProfile[1];
}
static ConditionProfile[] getFlagUncached() {
return PythonUtils.DISABLED;
}
}
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