com.zving.framework.thirdparty.asm.Label Maven / Gradle / Ivy
package com.zving.framework.thirdparty.asm;
public class Label
{
public Object info;
Frame frame;
Label successor;
Label next;
static final int DEBUG = 1;
static final int RESOLVED = 2;
static final int RESIZED = 4;
static final int PUSHED = 8;
static final int TARGET = 16;
static final int STORE = 32;
static final int REACHABLE = 64;
static final int JSR = 128;
static final int RET = 256;
static final int SUBROUTINE = 512;
static final int VISITED = 1024;
static final int VISITED2 = 2048;
int status;
int line;
int position;
private int referenceCount;
private int[] srcAndRefPositions;
int inputStackTop;
int outputStackMax;
Edge successors;
public int getOffset()
{
if ((this.status & 0x2) == 0) {
throw new IllegalStateException("Label offset position has not been resolved yet");
}
return this.position;
}
void put(MethodWriter owner, ByteVector out, int source, boolean wideOffset)
{
if ((this.status & 0x2) == 0)
{
if (wideOffset)
{
addReference(-1 - source, out.length);
out.putInt(-1);
}
else
{
addReference(source, out.length);
out.putShort(-1);
}
}
else if (wideOffset) {
out.putInt(this.position - source);
} else {
out.putShort(this.position - source);
}
}
private void addReference(int sourcePosition, int referencePosition)
{
if (this.srcAndRefPositions == null) {
this.srcAndRefPositions = new int[6];
}
if (this.referenceCount >= this.srcAndRefPositions.length)
{
int[] a = new int[this.srcAndRefPositions.length + 6];
System.arraycopy(this.srcAndRefPositions, 0, a, 0, this.srcAndRefPositions.length);
this.srcAndRefPositions = a;
}
this.srcAndRefPositions[(this.referenceCount++)] = sourcePosition;
this.srcAndRefPositions[(this.referenceCount++)] = referencePosition;
}
boolean resolve(MethodWriter owner, int position, byte[] data)
{
boolean needUpdate = false;
this.status |= 0x2;
this.position = position;
int i = 0;
while (i < this.referenceCount)
{
int source = this.srcAndRefPositions[(i++)];
int reference = this.srcAndRefPositions[(i++)];
if (source >= 0)
{
int offset = position - source;
if ((offset < 32768) || (offset > 32767))
{
int opcode = data[(reference - 1)] & 0xFF;
if (opcode <= 168) {
data[(reference - 1)] = ((byte)(opcode + 49));
} else {
data[(reference - 1)] = ((byte)(opcode + 20));
}
needUpdate = true;
}
data[(reference++)] = ((byte)(offset >>> 8));
data[reference] = ((byte)offset);
}
else
{
int offset = position + source + 1;
data[(reference++)] = ((byte)(offset >>> 24));
data[(reference++)] = ((byte)(offset >>> 16));
data[(reference++)] = ((byte)(offset >>> 8));
data[reference] = ((byte)offset);
}
}
return needUpdate;
}
Label getFirst()
{
return this.frame == null ? this : this.frame.owner;
}
boolean inSubroutine(long id)
{
if ((this.status & 0x400) != 0) {
return (this.srcAndRefPositions[((int)(id >>> 32))] & (int)id) != 0;
}
return false;
}
boolean inSameSubroutine(Label block)
{
if (((this.status & 0x400) == 0) || ((block.status & 0x400) == 0)) {
return false;
}
for (int i = 0; i < this.srcAndRefPositions.length; i++) {
if ((this.srcAndRefPositions[i] & block.srcAndRefPositions[i]) != 0) {
return true;
}
}
return false;
}
void addToSubroutine(long id, int nbSubroutines)
{
if ((this.status & 0x400) == 0)
{
this.status |= 0x400;
this.srcAndRefPositions = new int[(nbSubroutines - 1) / 32 + 1];
}
this.srcAndRefPositions[((int)(id >>> 32))] |= (int)id;
}
void visitSubroutine(Label JSR, long id, int nbSubroutines)
{
Label stack = this;
while (stack != null)
{
Label l = stack;
stack = l.next;
l.next = null;
if (JSR != null)
{
if ((l.status & 0x800) != 0) {
continue;
}
l.status |= 0x800;
if (((l.status & 0x100) != 0) &&
(!l.inSameSubroutine(JSR)))
{
Edge e = new Edge();
e.info = l.inputStackTop;
e.successor = JSR.successors.successor;
e.next = l.successors;
l.successors = e;
}
}
else
{
if (l.inSubroutine(id)) {
continue;
}
l.addToSubroutine(id, nbSubroutines);
}
Edge e = l.successors;
while (e != null)
{
if (((l.status & 0x80) == 0) || (e != l.successors.next)) {
if (e.successor.next == null)
{
e.successor.next = stack;
stack = e.successor;
}
}
e = e.next;
}
}
}
public String toString()
{
return "L" + System.identityHashCode(this);
}
}