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/*
* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* Portions Copyright (c) 2011 Jonas Maebe
*/
package fpc.tools.javapp;
import java.util.*;
import java.io.*;
import static fpc.tools.javapp.RuntimeConstants.*;
/* represents one entry of StackMapTable attribute
*/
class StackMapTableData {
final int frameType;
int offsetDelta;
StackMapTableData(int frameType) {
this.frameType = frameType;
}
void print(JavapPrinter p) {
p.out.print(" frame_type = " + frameType);
}
static class SameFrame extends StackMapTableData {
SameFrame(int frameType, int offsetDelta) {
super(frameType);
this.offsetDelta = offsetDelta;
}
void print(JavapPrinter p) {
super.print(p);
if (frameType < SAME_FRAME_BOUND) {
p.out.println(" /* same */");
} else {
p.out.println(" /* same_frame_extended */");
p.out.println(" offset_delta = " + offsetDelta);
}
}
}
static class SameLocals1StackItem extends StackMapTableData {
final int[] stack;
SameLocals1StackItem(int frameType, int offsetDelta, int[] stack) {
super(frameType);
this.offsetDelta = offsetDelta;
this.stack = stack;
}
void print(JavapPrinter p) {
super.print(p);
if (frameType == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
p.out.println(" /* same_locals_1_stack_item_frame_extended */");
p.out.println(" offset_delta = " + offsetDelta);
} else {
p.out.println(" /* same_locals_1_stack_item */");
}
p.printMap(" stack = [", stack);
}
}
static class ChopFrame extends StackMapTableData {
ChopFrame(int frameType, int offsetDelta) {
super(frameType);
this.offsetDelta = offsetDelta;
}
void print(JavapPrinter p) {
super.print(p);
p.out.println(" /* chop */");
p.out.println(" offset_delta = " + offsetDelta);
}
}
static class AppendFrame extends StackMapTableData {
final int[] locals;
AppendFrame(int frameType, int offsetDelta, int[] locals) {
super(frameType);
this.offsetDelta = offsetDelta;
this.locals = locals;
}
void print(JavapPrinter p) {
super.print(p);
p.out.println(" /* append */");
p.out.println(" offset_delta = " + offsetDelta);
p.printMap(" locals = [", locals);
}
}
static class FullFrame extends StackMapTableData {
final int[] locals;
final int[] stack;
FullFrame(int offsetDelta, int[] locals, int[] stack) {
super(FULL_FRAME);
this.offsetDelta = offsetDelta;
this.locals = locals;
this.stack = stack;
}
void print(JavapPrinter p) {
super.print(p);
p.out.println(" /* full_frame */");
p.out.println(" offset_delta = " + offsetDelta);
p.printMap(" locals = [", locals);
p.printMap(" stack = [", stack);
}
}
static StackMapTableData getInstance(DataInputStream in, MethodData method)
throws IOException {
int frameType = in.readUnsignedByte();
if (frameType < SAME_FRAME_BOUND) {
// same_frame
return new SameFrame(frameType, frameType);
} else if (SAME_FRAME_BOUND <= frameType && frameType < SAME_LOCALS_1_STACK_ITEM_BOUND) {
// same_locals_1_stack_item_frame
// read additional single stack element
return new SameLocals1StackItem(frameType,
(frameType - SAME_FRAME_BOUND),
StackMapData.readTypeArray(in, 1, method));
} else if (frameType == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
// same_locals_1_stack_item_extended
return new SameLocals1StackItem(frameType,
in.readUnsignedShort(),
StackMapData.readTypeArray(in, 1, method));
} else if (SAME_LOCALS_1_STACK_ITEM_EXTENDED < frameType && frameType < SAME_FRAME_EXTENDED) {
// chop_frame or same_frame_extended
return new ChopFrame(frameType, in.readUnsignedShort());
} else if (frameType == SAME_FRAME_EXTENDED) {
// chop_frame or same_frame_extended
return new SameFrame(frameType, in.readUnsignedShort());
} else if (SAME_FRAME_EXTENDED < frameType && frameType < FULL_FRAME) {
// append_frame
return new AppendFrame(frameType, in.readUnsignedShort(),
StackMapData.readTypeArray(in, frameType - SAME_FRAME_EXTENDED, method));
} else if (frameType == FULL_FRAME) {
// full_frame
int offsetDelta = in.readUnsignedShort();
int locals_size = in.readUnsignedShort();
int[] locals = StackMapData.readTypeArray(in, locals_size, method);
int stack_size = in.readUnsignedShort();
int[] stack = StackMapData.readTypeArray(in, stack_size, method);
return new FullFrame(offsetDelta, locals, stack);
} else {
throw new ClassFormatError("unrecognized frame_type in StackMapTable");
}
}
}
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