com.oracle.graal.python.nodes.bytecode.FrameInfo Maven / Gradle / Ivy
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package com.oracle.graal.python.nodes.bytecode;
import com.oracle.graal.python.compiler.CodeUnit;
import com.oracle.graal.python.compiler.OpCodesConstants;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.dsl.Idempotent;
import com.oracle.truffle.api.frame.Frame;
import com.oracle.truffle.api.frame.FrameDescriptor;
import com.oracle.truffle.api.strings.TruffleString;
/**
* Carries additional metadata for introspection of frames used by the bytecode interpreter. It's
* returned by {@link FrameDescriptor#getInfo()} if and only if the frame is coming from the
* bytecode interpreter.
*/
public final class FrameInfo {
@CompilationFinal PBytecodeRootNode rootNode;
public PBytecodeRootNode getRootNode() {
return rootNode;
}
public int getBci(Frame frame) {
if (frame.isInt(rootNode.bcioffset)) {
return frame.getInt(rootNode.bcioffset);
} else {
return -1;
}
}
public Object getYieldFrom(Frame generatorFrame, int bci, int stackTop) {
/* Match the `yield from` bytecode pattern and get the object from stack */
if (bci > 3 && bci < rootNode.bytecode.length && rootNode.bytecode[bci - 3] == OpCodesConstants.SEND && rootNode.bytecode[bci - 1] == OpCodesConstants.YIELD_VALUE &&
rootNode.bytecode[bci] == OpCodesConstants.RESUME_YIELD) {
return generatorFrame.getObject(stackTop);
}
return null;
}
@Idempotent
public int getVariableCount() {
CodeUnit code = rootNode.getCodeUnit();
return code.varnames.length + code.cellvars.length + code.freevars.length;
}
public TruffleString getVariableName(int slot) {
CodeUnit code = rootNode.getCodeUnit();
if (slot < code.varnames.length) {
return code.varnames[slot];
} else if (slot < code.varnames.length + code.cellvars.length) {
return code.cellvars[slot - code.varnames.length];
} else {
return code.freevars[slot - code.varnames.length - code.cellvars.length];
}
}
}
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