com.oracle.graal.python.compiler.Block Maven / Gradle / Ivy
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package com.oracle.graal.python.compiler;
import java.util.ArrayList;
import java.util.EnumSet;
/**
* Block of instructions. Not always exactly like basic block, we allow having jumps in the middle.
*/
final class Block {
ArrayList instr = new ArrayList<>();
Block next;
BlockInfo info;
/*
* For exception handlers: allows to unwind more stack items than usual. Useful to rollback to a
* mid-instruction stack state. Used by `with` statements.
*/
int unwindOffset;
// The following fields are filled when assembling
int stackLevel = -1;
int startBci = -1;
int endBci = -1;
public Block() {
}
private static final EnumSet RETURN_OPCODES = EnumSet.of(OpCodes.RETURN_VALUE, OpCodes.RAISE_VARARGS);
boolean isReturn() {
return !instr.isEmpty() && RETURN_OPCODES.contains(instr.get(instr.size() - 1).opcode);
}
BlockInfo.AbstractExceptionHandler findExceptionHandler() {
if (info != null) {
return info.findExceptionHandler();
}
return null;
}
int computeLoopDepth() {
int loopDepth = 0;
BlockInfo b = info;
while (b != null) {
if (b instanceof BlockInfo.Loop) {
loopDepth++;
}
b = b.outer;
}
return loopDepth;
}
}
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