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src/java.xml/share/classes/com/sun/org/apache/bcel/internal/classfile/StackMapEntry.java
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@@ -19,158 +19,422 @@
* limitations under the License.
*/
package com.sun.org.apache.bcel.internal.classfile;
-
-import com.sun.org.apache.bcel.internal.Constants;
-import java.io.*;
+import java.io.DataInput;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import com.sun.org.apache.bcel.internal.Const;
/**
* This class represents a stack map entry recording the types of
* local variables and the the of stack items at a given byte code offset.
* See CLDC specification 5.3.1.2
*
- * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
+ * @version $Id: StackMapEntry.java 1750029 2016-06-23 22:14:38Z sebb $
* @see StackMap
* @see StackMapType
*/
-public final class StackMapEntry implements Cloneable {
+public final class StackMapEntry implements Node, Cloneable
+{
+
+ private int frame_type;
private int byte_code_offset;
- private int number_of_locals;
private StackMapType[] types_of_locals;
- private int number_of_stack_items;
private StackMapType[] types_of_stack_items;
private ConstantPool constant_pool;
+
/**
- * Construct object from file stream.
- * @param file Input stream
+ * Construct object from input stream.
+ *
+ * @param input Input stream
* @throws IOException
*/
- StackMapEntry(DataInputStream file, ConstantPool constant_pool) throws IOException
- {
- this(file.readShort(), file.readShort(), null, -1, null, constant_pool);
+ StackMapEntry(final DataInput input, final ConstantPool constant_pool) throws IOException {
+ this(input.readByte() & 0xFF, -1, null, null, constant_pool);
+ if (frame_type >= Const.SAME_FRAME && frame_type <= Const.SAME_FRAME_MAX) {
+ byte_code_offset = frame_type - Const.SAME_FRAME;
+ } else if (frame_type >= Const.SAME_LOCALS_1_STACK_ITEM_FRAME &&
+ frame_type <= Const.SAME_LOCALS_1_STACK_ITEM_FRAME_MAX) {
+ byte_code_offset = frame_type - Const.SAME_LOCALS_1_STACK_ITEM_FRAME;
+ types_of_stack_items = new StackMapType[1];
+ types_of_stack_items[0] = new StackMapType(input, constant_pool);
+ } else if (frame_type == Const.SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED) {
+ byte_code_offset = input.readShort();
+ types_of_stack_items = new StackMapType[1];
+ types_of_stack_items[0] = new StackMapType(input, constant_pool);
+ } else if (frame_type >= Const.CHOP_FRAME && frame_type <= Const.CHOP_FRAME_MAX) {
+ byte_code_offset = input.readShort();
+ } else if (frame_type == Const.SAME_FRAME_EXTENDED) {
+ byte_code_offset = input.readShort();
+ } else if (frame_type >= Const.APPEND_FRAME && frame_type <= Const.APPEND_FRAME_MAX) {
+ byte_code_offset = input.readShort();
+ final int number_of_locals = frame_type - 251;
types_of_locals = new StackMapType[number_of_locals];
- for(int i=0; i < number_of_locals; i++)
- types_of_locals[i] = new StackMapType(file, constant_pool);
-
- number_of_stack_items = file.readShort();
+ for (int i = 0; i < number_of_locals; i++) {
+ types_of_locals[i] = new StackMapType(input, constant_pool);
+ }
+ } else if (frame_type == Const.FULL_FRAME) {
+ byte_code_offset = input.readShort();
+ final int number_of_locals = input.readShort();
+ types_of_locals = new StackMapType[number_of_locals];
+ for (int i = 0; i < number_of_locals; i++) {
+ types_of_locals[i] = new StackMapType(input, constant_pool);
+ }
+ final int number_of_stack_items = input.readShort();
types_of_stack_items = new StackMapType[number_of_stack_items];
- for(int i=0; i < number_of_stack_items; i++)
- types_of_stack_items[i] = new StackMapType(file, constant_pool);
+ for (int i = 0; i < number_of_stack_items; i++) {
+ types_of_stack_items[i] = new StackMapType(input, constant_pool);
+ }
+ } else {
+ /* Can't happen */
+ throw new ClassFormatException ("Invalid frame type found while parsing stack map table: " + frame_type);
+ }
}
- public StackMapEntry(int byte_code_offset, int number_of_locals,
- StackMapType[] types_of_locals,
- int number_of_stack_items,
- StackMapType[] types_of_stack_items,
- ConstantPool constant_pool) {
+ /**
+ * DO NOT USE
+ *
+ * @param byte_code_offset
+ * @param number_of_locals NOT USED
+ * @param types_of_locals array of {@link StackMapType}s of locals
+ * @param number_of_stack_items NOT USED
+ * @param types_of_stack_items array ot {@link StackMapType}s of stack items
+ * @param constant_pool the constant pool
+ * @deprecated Since 6.0, use {@link #StackMapEntry(int, int, StackMapType[], StackMapType[], ConstantPool)}
+ * instead
+ */
+ @java.lang.Deprecated
+ public StackMapEntry(final int byte_code_offset, final int number_of_locals,
+ final StackMapType[] types_of_locals, final int number_of_stack_items,
+ final StackMapType[] types_of_stack_items, final ConstantPool constant_pool) {
this.byte_code_offset = byte_code_offset;
- this.number_of_locals = number_of_locals;
- this.types_of_locals = types_of_locals;
- this.number_of_stack_items = number_of_stack_items;
- this.types_of_stack_items = types_of_stack_items;
+ this.types_of_locals = types_of_locals != null ? types_of_locals : new StackMapType[0];
+ this.types_of_stack_items = types_of_stack_items != null ? types_of_stack_items : new StackMapType[0];
this.constant_pool = constant_pool;
}
/**
+ * Create an instance
+ *
+ * @param tag the frame_type to use
+ * @param byte_code_offset
+ * @param types_of_locals array of {@link StackMapType}s of locals
+ * @param types_of_stack_items array ot {@link StackMapType}s of stack items
+ * @param constant_pool the constant pool
+ */
+ public StackMapEntry(final int tag, final int byte_code_offset,
+ final StackMapType[] types_of_locals,
+ final StackMapType[] types_of_stack_items, final ConstantPool constant_pool) {
+ this.frame_type = tag;
+ this.byte_code_offset = byte_code_offset;
+ this.types_of_locals = types_of_locals != null ? types_of_locals : new StackMapType[0];
+ this.types_of_stack_items = types_of_stack_items != null ? types_of_stack_items : new StackMapType[0];
+ this.constant_pool = constant_pool;
+ }
+
+
+ /**
* Dump stack map entry
*
* @param file Output file stream
* @throws IOException
*/
- public final void dump(DataOutputStream file) throws IOException
- {
+ public final void dump( final DataOutputStream file ) throws IOException {
+ file.write(frame_type);
+ if (frame_type >= Const.SAME_FRAME && frame_type <= Const.SAME_FRAME_MAX) {
+ // nothing to be done
+ } else if (frame_type >= Const.SAME_LOCALS_1_STACK_ITEM_FRAME &&
+ frame_type <= Const.SAME_LOCALS_1_STACK_ITEM_FRAME_MAX) {
+ types_of_stack_items[0].dump(file);
+ } else if (frame_type == Const.SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED) {
file.writeShort(byte_code_offset);
-
- file.writeShort(number_of_locals);
- for(int i=0; i < number_of_locals; i++)
- types_of_locals[i].dump(file);
-
- file.writeShort(number_of_stack_items);
- for(int i=0; i < number_of_stack_items; i++)
- types_of_stack_items[i].dump(file);
+ types_of_stack_items[0].dump(file);
+ } else if (frame_type >= Const.CHOP_FRAME && frame_type <= Const.CHOP_FRAME_MAX) {
+ file.writeShort(byte_code_offset);
+ } else if (frame_type == Const.SAME_FRAME_EXTENDED) {
+ file.writeShort(byte_code_offset);
+ } else if (frame_type >= Const.APPEND_FRAME && frame_type <= Const.APPEND_FRAME_MAX) {
+ file.writeShort(byte_code_offset);
+ for (final StackMapType type : types_of_locals) {
+ type.dump(file);
+ }
+ } else if (frame_type == Const.FULL_FRAME) {
+ file.writeShort(byte_code_offset);
+ file.writeShort(types_of_locals.length);
+ for (final StackMapType type : types_of_locals) {
+ type.dump(file);
+ }
+ file.writeShort(types_of_stack_items.length);
+ for (final StackMapType type : types_of_stack_items) {
+ type.dump(file);
+ }
+ } else {
+ /* Can't happen */
+ throw new ClassFormatException ("Invalid Stack map table tag: " + frame_type);
+ }
}
+
/**
* @return String representation.
*/
+ @Override
public final String toString() {
- StringBuffer buf = new StringBuffer("(offset=" + byte_code_offset);
-
- if(number_of_locals > 0) {
+ final StringBuilder buf = new StringBuilder(64);
+ buf.append("(");
+ if (frame_type >= Const.SAME_FRAME && frame_type <= Const.SAME_FRAME_MAX) {
+ buf.append("SAME");
+ } else if (frame_type >= Const.SAME_LOCALS_1_STACK_ITEM_FRAME &&
+ frame_type <= Const.SAME_LOCALS_1_STACK_ITEM_FRAME_MAX) {
+ buf.append("SAME_LOCALS_1_STACK");
+ } else if (frame_type == Const.SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED) {
+ buf.append("SAME_LOCALS_1_STACK_EXTENDED");
+ } else if (frame_type >= Const.CHOP_FRAME && frame_type <= Const.CHOP_FRAME_MAX) {
+ buf.append("CHOP ").append(String.valueOf(251-frame_type));
+ } else if (frame_type == Const.SAME_FRAME_EXTENDED) {
+ buf.append("SAME_EXTENDED");
+ } else if (frame_type >= Const.APPEND_FRAME && frame_type <= Const.APPEND_FRAME_MAX) {
+ buf.append("APPEND ").append(String.valueOf(frame_type-251));
+ } else if (frame_type == Const.FULL_FRAME) {
+ buf.append("FULL");
+ } else {
+ buf.append("UNKNOWN (").append(frame_type).append(")");
+ }
+ buf.append(", offset delta=").append(byte_code_offset);
+ if (types_of_locals.length > 0) {
buf.append(", locals={");
-
- for(int i=0; i < number_of_locals; i++) {
+ for (int i = 0; i < types_of_locals.length; i++) {
buf.append(types_of_locals[i]);
- if(i < number_of_locals - 1)
+ if (i < types_of_locals.length - 1) {
buf.append(", ");
}
-
+ }
buf.append("}");
}
-
- if(number_of_stack_items > 0) {
+ if (types_of_stack_items.length > 0) {
buf.append(", stack items={");
-
- for(int i=0; i < number_of_stack_items; i++) {
+ for (int i = 0; i < types_of_stack_items.length; i++) {
buf.append(types_of_stack_items[i]);
- if(i < number_of_stack_items - 1)
+ if (i < types_of_stack_items.length - 1) {
buf.append(", ");
}
-
+ }
buf.append("}");
}
-
buf.append(")");
-
return buf.toString();
}
- public void setByteCodeOffset(int b) { byte_code_offset = b; }
- public int getByteCodeOffset() { return byte_code_offset; }
- public void setNumberOfLocals(int n) { number_of_locals = n; }
- public int getNumberOfLocals() { return number_of_locals; }
- public void setTypesOfLocals(StackMapType[] t) { types_of_locals = t; }
- public StackMapType[] getTypesOfLocals() { return types_of_locals; }
- public void setNumberOfStackItems(int n) { number_of_stack_items = n; }
- public int getNumberOfStackItems() { return number_of_stack_items; }
- public void setTypesOfStackItems(StackMapType[] t) { types_of_stack_items = t; }
- public StackMapType[] getTypesOfStackItems() { return types_of_stack_items; }
+ /**
+ * Calculate stack map entry size
+ *
+ */
+ int getMapEntrySize() {
+ if (frame_type >= Const.SAME_FRAME && frame_type <= Const.SAME_FRAME_MAX) {
+ return 1;
+ } else if (frame_type >= Const.SAME_LOCALS_1_STACK_ITEM_FRAME &&
+ frame_type <= Const.SAME_LOCALS_1_STACK_ITEM_FRAME_MAX) {
+ return 1 + (types_of_stack_items[0].hasIndex() ? 3 : 1);
+ } else if (frame_type == Const.SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED) {
+ return 3 + (types_of_stack_items[0].hasIndex() ? 3 : 1);
+ } else if (frame_type >= Const.CHOP_FRAME && frame_type <= Const.CHOP_FRAME_MAX) {
+ return 3;
+ } else if (frame_type == Const.SAME_FRAME_EXTENDED) {
+ return 3;
+ } else if (frame_type >= Const.APPEND_FRAME && frame_type <= Const.APPEND_FRAME_MAX) {
+ int len = 3;
+ for (final StackMapType types_of_local : types_of_locals) {
+ len += types_of_local.hasIndex() ? 3 : 1;
+ }
+ return len;
+ } else if (frame_type == Const.FULL_FRAME) {
+ int len = 7;
+ for (final StackMapType types_of_local : types_of_locals) {
+ len += types_of_local.hasIndex() ? 3 : 1;
+ }
+ for (final StackMapType types_of_stack_item : types_of_stack_items) {
+ len += types_of_stack_item.hasIndex() ? 3 : 1;
+ }
+ return len;
+ } else {
+ throw new RuntimeException("Invalid StackMap frame_type: " + frame_type);
+ }
+ }
+
+
+ public void setFrameType( final int f ) {
+ if (f >= Const.SAME_FRAME && f <= Const.SAME_FRAME_MAX) {
+ byte_code_offset = f - Const.SAME_FRAME;
+ } else if (f >= Const.SAME_LOCALS_1_STACK_ITEM_FRAME &&
+ f <= Const.SAME_LOCALS_1_STACK_ITEM_FRAME_MAX) {
+ byte_code_offset = f - Const.SAME_LOCALS_1_STACK_ITEM_FRAME;
+ } else if (f == Const.SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED) { // CHECKSTYLE IGNORE EmptyBlock
+ } else if (f >= Const.CHOP_FRAME && f <= Const.CHOP_FRAME_MAX) { // CHECKSTYLE IGNORE EmptyBlock
+ } else if (f == Const.SAME_FRAME_EXTENDED) { // CHECKSTYLE IGNORE EmptyBlock
+ } else if (f >= Const.APPEND_FRAME && f <= Const.APPEND_FRAME_MAX) { // CHECKSTYLE IGNORE EmptyBlock
+ } else if (f == Const.FULL_FRAME) { // CHECKSTYLE IGNORE EmptyBlock
+ } else {
+ throw new RuntimeException("Invalid StackMap frame_type");
+ }
+ frame_type = f;
+ }
+
+
+ public int getFrameType() {
+ return frame_type;
+ }
+
+
+ public void setByteCodeOffset( final int new_offset ) {
+ if (new_offset < 0 || new_offset > 32767) {
+ throw new RuntimeException("Invalid StackMap offset: " + new_offset);
+ }
+
+ if (frame_type >= Const.SAME_FRAME &&
+ frame_type <= Const.SAME_FRAME_MAX) {
+ if (new_offset > Const.SAME_FRAME_MAX) {
+ frame_type = Const.SAME_FRAME_EXTENDED;
+ } else {
+ frame_type = new_offset;
+ }
+ } else if (frame_type >= Const.SAME_LOCALS_1_STACK_ITEM_FRAME &&
+ frame_type <= Const.SAME_LOCALS_1_STACK_ITEM_FRAME_MAX) {
+ if (new_offset > Const.SAME_FRAME_MAX) {
+ frame_type = Const.SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED;
+ } else {
+ frame_type = Const.SAME_LOCALS_1_STACK_ITEM_FRAME + new_offset;
+ }
+ } else if (frame_type == Const.SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED) { // CHECKSTYLE IGNORE EmptyBlock
+ } else if (frame_type >= Const.CHOP_FRAME &&
+ frame_type <= Const.CHOP_FRAME_MAX) { // CHECKSTYLE IGNORE EmptyBlock
+ } else if (frame_type == Const.SAME_FRAME_EXTENDED) { // CHECKSTYLE IGNORE EmptyBlock
+ } else if (frame_type >= Const.APPEND_FRAME &&
+ frame_type <= Const.APPEND_FRAME_MAX) { // CHECKSTYLE IGNORE EmptyBlock
+ } else if (frame_type == Const.FULL_FRAME) { // CHECKSTYLE IGNORE EmptyBlock
+ } else {
+ throw new RuntimeException("Invalid StackMap frame_type: " + frame_type);
+ }
+ byte_code_offset = new_offset;
+ }
+
+
+ /**
+ * Update the distance (as an offset delta) from this StackMap
+ * entry to the next. Note that this might cause the the
+ * frame type to change. Note also that delta may be negative.
+ *
+ * @param delta offset delta
+ */
+ public void updateByteCodeOffset(final int delta) {
+ setByteCodeOffset(byte_code_offset + delta);
+ }
+
+
+ public int getByteCodeOffset() {
+ return byte_code_offset;
+ }
+
+
+ /**
+ *
+ * @deprecated since 6.0
+ */
+ @java.lang.Deprecated
+ public void setNumberOfLocals( final int n ) { // TODO unused
+ }
+
+
+ public int getNumberOfLocals() {
+ return types_of_locals.length;
+ }
+
+
+ public void setTypesOfLocals( final StackMapType[] types ) {
+ types_of_locals = types != null ? types : new StackMapType[0];
+ }
+
+
+ public StackMapType[] getTypesOfLocals() {
+ return types_of_locals;
+ }
+
+
+ /**
+ *
+ * @deprecated since 6.0
+ */
+ @java.lang.Deprecated
+ public void setNumberOfStackItems( final int n ) { // TODO unused
+ }
+
+
+ public int getNumberOfStackItems() {
+ return types_of_stack_items.length;
+ }
+
+
+ public void setTypesOfStackItems( final StackMapType[] types ) {
+ types_of_stack_items = types != null ? types : new StackMapType[0];
+ }
+
+
+ public StackMapType[] getTypesOfStackItems() {
+ return types_of_stack_items;
+ }
+
/**
* @return deep copy of this object
*/
public StackMapEntry copy() {
+ StackMapEntry e;
try {
- return (StackMapEntry)clone();
- } catch(CloneNotSupportedException e) {}
+ e = (StackMapEntry) clone();
+ } catch (final CloneNotSupportedException ex) {
+ throw new Error("Clone Not Supported");
+ }
- return null;
+ e.types_of_locals = new StackMapType[types_of_locals.length];
+ for (int i = 0; i < types_of_locals.length; i++) {
+ e.types_of_locals[i] = types_of_locals[i].copy();
+ }
+ e.types_of_stack_items = new StackMapType[types_of_stack_items.length];
+ for (int i = 0; i < types_of_stack_items.length; i++) {
+ e.types_of_stack_items[i] = types_of_stack_items[i].copy();
}
+ return e;
+ }
+
/**
* Called by objects that are traversing the nodes of the tree implicitely
* defined by the contents of a Java class. I.e., the hierarchy of methods,
* fields, attributes, etc. spawns a tree of objects.
*
* @param v Visitor object
*/
- public void accept(Visitor v) {
+ @Override
+ public void accept( final Visitor v ) {
v.visitStackMapEntry(this);
}
+
/**
* @return Constant pool used by this object.
*/
- public final ConstantPool getConstantPool() { return constant_pool; }
+ public final ConstantPool getConstantPool() {
+ return constant_pool;
+ }
+
/**
* @param constant_pool Constant pool to be used for this object.
*/
- public final void setConstantPool(ConstantPool constant_pool) {
+ public final void setConstantPool( final ConstantPool constant_pool ) {
this.constant_pool = constant_pool;
}
}
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