--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/jdk.jdeps/share/classes/com/sun/tools/javap/StackMapWriter.java Wed May 27 13:25:18 2015 -0700
@@ -0,0 +1,289 @@
+/*
+ * Copyright (c) 2009, 2013, 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.
+ */
+
+package com.sun.tools.javap;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
+import com.sun.tools.classfile.AccessFlags;
+import com.sun.tools.classfile.Attribute;
+import com.sun.tools.classfile.Code_attribute;
+import com.sun.tools.classfile.ConstantPool;
+import com.sun.tools.classfile.ConstantPoolException;
+import com.sun.tools.classfile.Descriptor;
+import com.sun.tools.classfile.Descriptor.InvalidDescriptor;
+import com.sun.tools.classfile.Instruction;
+import com.sun.tools.classfile.Method;
+import com.sun.tools.classfile.StackMapTable_attribute;
+import com.sun.tools.classfile.StackMapTable_attribute.*;
+
+import static com.sun.tools.classfile.StackMapTable_attribute.verification_type_info.*;
+
+/**
+ * Annotate instructions with stack map.
+ *
+ * <p><b>This is NOT part of any supported API.
+ * If you write code that depends on this, you do so at your own risk.
+ * This code and its internal interfaces are subject to change or
+ * deletion without notice.</b>
+ */
+public class StackMapWriter extends InstructionDetailWriter {
+ static StackMapWriter instance(Context context) {
+ StackMapWriter instance = context.get(StackMapWriter.class);
+ if (instance == null)
+ instance = new StackMapWriter(context);
+ return instance;
+ }
+
+ protected StackMapWriter(Context context) {
+ super(context);
+ context.put(StackMapWriter.class, this);
+ classWriter = ClassWriter.instance(context);
+ }
+
+ public void reset(Code_attribute attr) {
+ setStackMap((StackMapTable_attribute) attr.attributes.get(Attribute.StackMapTable));
+ }
+
+ void setStackMap(StackMapTable_attribute attr) {
+ if (attr == null) {
+ map = null;
+ return;
+ }
+
+ Method m = classWriter.getMethod();
+ Descriptor d = m.descriptor;
+ String[] args;
+ try {
+ ConstantPool cp = classWriter.getClassFile().constant_pool;
+ String argString = d.getParameterTypes(cp);
+ args = argString.substring(1, argString.length() - 1).split("[, ]+");
+ } catch (ConstantPoolException | InvalidDescriptor e) {
+ return;
+ }
+ boolean isStatic = m.access_flags.is(AccessFlags.ACC_STATIC);
+
+ verification_type_info[] initialLocals = new verification_type_info[(isStatic ? 0 : 1) + args.length];
+ if (!isStatic)
+ initialLocals[0] = new CustomVerificationTypeInfo("this");
+ for (int i = 0; i < args.length; i++) {
+ initialLocals[(isStatic ? 0 : 1) + i] =
+ new CustomVerificationTypeInfo(args[i].replace(".", "/"));
+ }
+
+ map = new HashMap<>();
+ StackMapBuilder builder = new StackMapBuilder();
+
+ // using -1 as the pc for the initial frame effectively compensates for
+ // the difference in behavior for the first stack map frame (where the
+ // pc offset is just offset_delta) compared to subsequent frames (where
+ // the pc offset is always offset_delta+1).
+ int pc = -1;
+
+ map.put(pc, new StackMap(initialLocals, empty));
+
+ for (int i = 0; i < attr.entries.length; i++)
+ pc = attr.entries[i].accept(builder, pc);
+ }
+
+ public void writeInitialDetails() {
+ writeDetails(-1);
+ }
+
+ public void writeDetails(Instruction instr) {
+ writeDetails(instr.getPC());
+ }
+
+ private void writeDetails(int pc) {
+ if (map == null)
+ return;
+
+ StackMap m = map.get(pc);
+ if (m != null) {
+ print("StackMap locals: ", m.locals);
+ print("StackMap stack: ", m.stack);
+ }
+
+ }
+
+ void print(String label, verification_type_info[] entries) {
+ print(label);
+ for (int i = 0; i < entries.length; i++) {
+ print(" ");
+ print(entries[i]);
+ }
+ println();
+ }
+
+ void print(verification_type_info entry) {
+ if (entry == null) {
+ print("ERROR");
+ return;
+ }
+
+ switch (entry.tag) {
+ case -1:
+ print(((CustomVerificationTypeInfo) entry).text);
+ break;
+
+ case ITEM_Top:
+ print("top");
+ break;
+
+ case ITEM_Integer:
+ print("int");
+ break;
+
+ case ITEM_Float:
+ print("float");
+ break;
+
+ case ITEM_Long:
+ print("long");
+ break;
+
+ case ITEM_Double:
+ print("double");
+ break;
+
+ case ITEM_Null:
+ print("null");
+ break;
+
+ case ITEM_UninitializedThis:
+ print("uninit_this");
+ break;
+
+ case ITEM_Object:
+ try {
+ ConstantPool cp = classWriter.getClassFile().constant_pool;
+ ConstantPool.CONSTANT_Class_info class_info = cp.getClassInfo(((Object_variable_info) entry).cpool_index);
+ print(cp.getUTF8Value(class_info.name_index));
+ } catch (ConstantPoolException e) {
+ print("??");
+ }
+ break;
+
+ case ITEM_Uninitialized:
+ print(((Uninitialized_variable_info) entry).offset);
+ break;
+ }
+
+ }
+
+ private Map<Integer, StackMap> map;
+ private ClassWriter classWriter;
+
+ class StackMapBuilder
+ implements StackMapTable_attribute.stack_map_frame.Visitor<Integer, Integer> {
+
+ public Integer visit_same_frame(same_frame frame, Integer pc) {
+ int new_pc = pc + frame.getOffsetDelta() + 1;
+ StackMap m = map.get(pc);
+ assert (m != null);
+ map.put(new_pc, m);
+ return new_pc;
+ }
+
+ public Integer visit_same_locals_1_stack_item_frame(same_locals_1_stack_item_frame frame, Integer pc) {
+ int new_pc = pc + frame.getOffsetDelta() + 1;
+ StackMap prev = map.get(pc);
+ assert (prev != null);
+ StackMap m = new StackMap(prev.locals, frame.stack);
+ map.put(new_pc, m);
+ return new_pc;
+ }
+
+ public Integer visit_same_locals_1_stack_item_frame_extended(same_locals_1_stack_item_frame_extended frame, Integer pc) {
+ int new_pc = pc + frame.getOffsetDelta() + 1;
+ StackMap prev = map.get(pc);
+ assert (prev != null);
+ StackMap m = new StackMap(prev.locals, frame.stack);
+ map.put(new_pc, m);
+ return new_pc;
+ }
+
+ public Integer visit_chop_frame(chop_frame frame, Integer pc) {
+ int new_pc = pc + frame.getOffsetDelta() + 1;
+ StackMap prev = map.get(pc);
+ assert (prev != null);
+ int k = 251 - frame.frame_type;
+ verification_type_info[] new_locals = Arrays.copyOf(prev.locals, prev.locals.length - k);
+ StackMap m = new StackMap(new_locals, empty);
+ map.put(new_pc, m);
+ return new_pc;
+ }
+
+ public Integer visit_same_frame_extended(same_frame_extended frame, Integer pc) {
+ int new_pc = pc + frame.getOffsetDelta();
+ StackMap m = map.get(pc);
+ assert (m != null);
+ map.put(new_pc, m);
+ return new_pc;
+ }
+
+ public Integer visit_append_frame(append_frame frame, Integer pc) {
+ int new_pc = pc + frame.getOffsetDelta() + 1;
+ StackMap prev = map.get(pc);
+ assert (prev != null);
+ verification_type_info[] new_locals = new verification_type_info[prev.locals.length + frame.locals.length];
+ System.arraycopy(prev.locals, 0, new_locals, 0, prev.locals.length);
+ System.arraycopy(frame.locals, 0, new_locals, prev.locals.length, frame.locals.length);
+ StackMap m = new StackMap(new_locals, empty);
+ map.put(new_pc, m);
+ return new_pc;
+ }
+
+ public Integer visit_full_frame(full_frame frame, Integer pc) {
+ int new_pc = pc + frame.getOffsetDelta() + 1;
+ StackMap m = new StackMap(frame.locals, frame.stack);
+ map.put(new_pc, m);
+ return new_pc;
+ }
+
+ }
+
+ static class StackMap {
+ StackMap(verification_type_info[] locals, verification_type_info[] stack) {
+ this.locals = locals;
+ this.stack = stack;
+ }
+
+ private final verification_type_info[] locals;
+ private final verification_type_info[] stack;
+ }
+
+ static class CustomVerificationTypeInfo extends verification_type_info {
+ public CustomVerificationTypeInfo(String text) {
+ super(-1);
+ this.text = text;
+ }
+ private String text;
+ }
+
+ private final verification_type_info[] empty = { };
+}