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/*
 * 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.
 *
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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.
 *
 *  

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. */ 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 map; private ClassWriter classWriter; class StackMapBuilder implements StackMapTable_attribute.stack_map_frame.Visitor { 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 = { }; }





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