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Diffstat (limited to 'src/fjbg/ch/epfl/lamp/fjbg/JStackMapTableAttribute.java')
-rw-r--r--src/fjbg/ch/epfl/lamp/fjbg/JStackMapTableAttribute.java282
1 files changed, 0 insertions, 282 deletions
diff --git a/src/fjbg/ch/epfl/lamp/fjbg/JStackMapTableAttribute.java b/src/fjbg/ch/epfl/lamp/fjbg/JStackMapTableAttribute.java
deleted file mode 100644
index 72a5484d40..0000000000
--- a/src/fjbg/ch/epfl/lamp/fjbg/JStackMapTableAttribute.java
+++ /dev/null
@@ -1,282 +0,0 @@
-/* FJBG -- Fast Java Bytecode Generator
- * Copyright 2002-2013 LAMP/EPFL
- * @author Michel Schinz
- */
-
-package ch.epfl.lamp.fjbg;
-
-import java.io.DataInputStream;
-import java.io.DataOutputStream;
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Iterator;
-import java.util.List;
-
-/**
- *
- * @author Stephane Micheloud
- * @version 1.0
- */
-
-public class JStackMapTableAttribute extends JAttribute {
- /** Constant pool of the current classfile. */
- private JConstantPool pool;
-
- /** StackMapTable entries */
- protected final List/*<Frame>*/ entries = new ArrayList();
- protected int entriesSize = 0;
- protected boolean usesU2;
-
- public JStackMapTableAttribute(FJBGContext context,
- JClass clazz,
- JCode code) {
- super(context, clazz);
- this.pool = clazz.pool;
-
- assert code.getOwner().getOwner() == clazz;
- }
-
- public JStackMapTableAttribute(FJBGContext context,
- JClass clazz,
- Object owner,
- String name,
- int size,
- DataInputStream stream)
- throws IOException {
- super(context, clazz, name);
- this.pool = clazz.pool;
-
- int count = stream.readShort();
- this.usesU2 = count < 65536;
- for (int i = 0; i < count; ++i)
- this.entries.add(new Frame(stream));
- this.entriesSize = computeSize();
-
- assert name.equals(getName());
- }
-
- public String getName() { return "StackMapTable"; }
-
- // Follows javap output format for StackMapTable attribute.
- /*@Override*/ public String toString() {
- Frame frame = null;
- StringBuffer buf = new StringBuffer(" StackMapTable: number_of_entries = ");
- buf.append(entries.size());
- Iterator it = entries.iterator();
- while (it.hasNext()) {
- frame = (Frame)it.next();
- buf.append("\n frame_type = ");
- buf.append(frame.tag);
- buf.append(" /* ");
- buf.append(getFrameType(frame.tag));
- buf.append(" */");
- if (frame.offsetDelta != -1)
- buf.append("\n offset_delta = "+frame.offsetDelta);
- if (frame.locals != null)
- appendTypeInfoArray(buf, "locals", frame.locals);
- if (frame.stackItems != null)
- appendTypeInfoArray(buf, "stack", frame.stackItems);
- }
- buf.append("\n");
- return buf.toString();
- }
-
- protected int getSize() {
- return entriesSize;
- }
-
- protected void writeContentsTo(DataOutputStream stream) throws IOException {
- stream.writeShort(entriesSize);
- Iterator it = entries.iterator();
- while (it.hasNext()) {
- Frame frame = (Frame)it.next();
- frame.writeContentsTo(stream);
- }
- }
-
- private class TypeInfo {
- final int tag;
- final int poolIndexOrOffset; // tag == 7 => poolIndex, tag = 8 => offset
- private int bytes;
- TypeInfo(DataInputStream stream) throws IOException {
- int size = 1;
- this.tag = stream.readByte();
- if (tag == 7) { // ITEM_Object; // 7
- poolIndexOrOffset = stream.readShort();
- size += 2;
- } else if (tag == 8) { // ITEM_Uninitialized // 8
- poolIndexOrOffset = (usesU2) ? stream.readShort() : stream.readInt();
- size += (usesU2) ? 2 : 4;
- } else
- poolIndexOrOffset = -1;
- this.bytes += size;
- }
- int getSize() { return bytes; }
- void writeContentsTo(DataOutputStream stream) throws IOException {
- stream.writeByte(tag);
- if (tag == 7) { // ITEM_Object; // 7
- stream.writeShort(poolIndexOrOffset);
- } else if (tag == 8) { // ITEM_Uninitialized // 8
- if (usesU2) stream.writeShort(poolIndexOrOffset);
- else stream.writeInt(poolIndexOrOffset);
- }
- }
- /*@Override*/ public String toString() {
- switch (tag) {
- case 0: // ITEM_Top
- return "<top>";
- case 1: // ITEM_Integer
- return "int";
- case 2: // ITEM_Float
- return "float";
- case 3: // ITEM_Double
- return "double";
- case 4: // ITEM_Long
- return "long";
- case 5: // ITEM_Null
- return "null";
- case 6: // ITEM_UninializedThis
- return "this";
- case 7: // ITEM_Object
- String name = pool.lookupClass(poolIndexOrOffset);
- if (name.startsWith("[")) name = "\""+name+"\"";
- return "class "+name;
- case 8: // ITEM_Uninitialized
- return "<uninitialized>";
- default:
- return String.valueOf(tag);
- }
- }
- }
-
- private class Frame {
- final int tag;
- int offsetDelta = -1;
- TypeInfo[] stackItems = null;
- TypeInfo[] locals = null;
- private int bytes;
- Frame(DataInputStream stream) throws IOException {
- // The stack_map_frame structure consists of a one-byte tag
- // followed by zero or more bytes.
- this.tag = stream.readUnsignedByte();
- if (tag < 64) { // SAME; // 0-63
- //done
- } else if (tag < 128) { // SAME_LOCALS_1_STACK_ITEM; // 64-127
- this.offsetDelta = tag - 64;
- readStackItems(stream, 1);
- } else if (tag < 248) { // reserved for future use.
- assert false : "Tags in the range [128-247] are reserved for future use.";
- } else if (tag < 251) { // CHOP; // 248-250
- int k = 251 - tag;
- readOffsetDelta(stream);
- } else if (tag == 251) { // SAME_FRAME_EXTENDED
- readOffsetDelta(stream);
- } else if (tag < 255) { // APPEND; // 252-254
- readOffsetDelta(stream);
- readLocals(stream, tag - 251);
- } else { // FULL_FRAME; // 255
- readOffsetDelta(stream);
- readLocals(stream);
- readStackItems(stream);
- }
- }
- int getSize() { return bytes; }
- void readOffsetDelta(DataInputStream stream) throws IOException {
- this.offsetDelta = (usesU2) ? stream.readShort() : stream.readInt();
- this.bytes += (usesU2) ? 2 : 4;
- }
- int getOffsetDelta() { return offsetDelta; }
- void readStackItems(DataInputStream stream, int k) throws IOException {
- this.stackItems = new TypeInfo[k];
- for (int i = 0; i < k; ++i) {
- stackItems[i] = new TypeInfo(stream);
- this.bytes += stackItems[i].getSize();
- }
- }
- void readStackItems(DataInputStream stream) throws IOException {
- int k = (usesU2) ? stream.readShort() : stream.readInt();
- this.bytes += (usesU2) ? 2 : 4;
- readStackItems(stream, k);
- }
- void readLocals(DataInputStream stream, int k) throws IOException {
- this.locals = new TypeInfo[k];
- for (int i = 0; i < k; ++i) {
- locals[i] = new TypeInfo(stream);
- this.bytes += locals[i].getSize();
- }
- }
- void readLocals(DataInputStream stream) throws IOException {
- int k = (usesU2) ? stream.readShort() : stream.readInt();
- this.bytes += (usesU2) ? 2 : 4;
- readLocals(stream, k);
- }
- void writeContentsTo(DataOutputStream stream) throws IOException {
- stream.writeByte(tag);
- if (tag < 64) {
- //done
- } else if (tag < 128) { // SAME; // 0-63
- assert stackItems.length == 1;
- stackItems[0].writeContentsTo(stream);
- } else if (tag < 248) {
- assert false : "Tags in the range [128-247] are reserved for future use.";
- } else if (tag < 251) {
- if (usesU2) stream.writeShort(offsetDelta);
- else stream.writeInt(offsetDelta);
- } else if (tag == 251) {
- if (usesU2) stream.writeShort(offsetDelta);
- else stream.writeInt(offsetDelta);
- } else if (tag < 255) { // APPEND; // 252-254
- if (usesU2) stream.writeShort(offsetDelta);
- else stream.writeInt(offsetDelta);
- for (int i = 0; i < locals.length; ++i)
- locals[i].writeContentsTo(stream);
- } else {
- if (usesU2) stream.writeShort(offsetDelta);
- else stream.writeInt(offsetDelta);
- for (int i = 0; i < locals.length; ++i)
- locals[i].writeContentsTo(stream);
- for (int i = 0; i < stackItems.length; ++i)
- stackItems[i].writeContentsTo(stream);
- }
- }
- }
-
- private int computeSize() {
- int size = (usesU2) ? 2 : 4; // number of frames
- Iterator it = entries.iterator();
- while (it.hasNext()) {
- Frame frame = (Frame)it.next();
- size += frame.getSize();
- }
- return size;
- }
-
- private static final String getFrameType(int tag) {
- if (tag < 64) return "same";
- else if (tag < 128) return "same locals 1 stack item";
- else if (tag < 248) return "<reserved>";
- else if (tag < 251) return "chop";
- else if (tag == 251) return "same frame extended";
- else if (tag < 255) return "append";
- else return "full frame";
- }
-
- private static StringBuffer appendTypeInfoArray(StringBuffer buf,
- String s, TypeInfo[] a) {
- buf.append("\n ");
- buf.append(s);
- buf.append(" = ");
- if (a.length > 0) {
- buf.append("[ ");
- for (int i = 0; i < a.length; ++i) {
- if (i > 0) buf.append(", ");
- buf.append(a[i]);
- }
- buf.append(" ]");
- }
- else
- buf.append("[]");
- return buf;
- }
-
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-19 20:31:00 +0000