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/*
 * Copyright (c) 2007, 2020, 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.ArrayList;
import java.util.List;

import com.sun.tools.classfile.AccessFlags;
import com.sun.tools.classfile.Code_attribute;
import com.sun.tools.classfile.ConstantPool;
import com.sun.tools.classfile.ConstantPoolException;
import com.sun.tools.classfile.DescriptorException;
import com.sun.tools.classfile.Instruction;
import com.sun.tools.classfile.Instruction.TypeKind;
import com.sun.tools.classfile.Method;

/*
 *  Write the contents of a Code attribute.
 *
 *  

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 CodeWriter extends BasicWriter { public static CodeWriter instance(Context context) { CodeWriter instance = context.get(CodeWriter.class); if (instance == null) instance = new CodeWriter(context); return instance; } protected CodeWriter(Context context) { super(context); context.put(CodeWriter.class, this); attrWriter = AttributeWriter.instance(context); classWriter = ClassWriter.instance(context); constantWriter = ConstantWriter.instance(context); sourceWriter = SourceWriter.instance(context); tryBlockWriter = TryBlockWriter.instance(context); stackMapWriter = StackMapWriter.instance(context); localVariableTableWriter = LocalVariableTableWriter.instance(context); localVariableTypeTableWriter = LocalVariableTypeTableWriter.instance(context); typeAnnotationWriter = TypeAnnotationWriter.instance(context); options = Options.instance(context); } void write(Code_attribute attr, ConstantPool constant_pool) { println("Code:"); indent(+1); writeVerboseHeader(attr, constant_pool); writeInstrs(attr); writeExceptionTable(attr); attrWriter.write(attr, attr.attributes, constant_pool); indent(-1); } public void writeVerboseHeader(Code_attribute attr, ConstantPool constant_pool) { Method method = classWriter.getMethod(); String argCount; try { int n = method.descriptor.getParameterCount(constant_pool); if (!method.access_flags.is(AccessFlags.ACC_STATIC)) ++n; // for 'this' argCount = Integer.toString(n); } catch (ConstantPoolException e) { argCount = report(e); } catch (DescriptorException e) { argCount = report(e); } println("stack=" + attr.max_stack + ", locals=" + attr.max_locals + ", args_size=" + argCount); } public void writeInstrs(Code_attribute attr) { List detailWriters = getDetailWriters(attr); for (Instruction instr: attr.getInstructions()) { try { for (InstructionDetailWriter w: detailWriters) w.writeDetails(instr); writeInstr(instr); } catch (ArrayIndexOutOfBoundsException | IllegalStateException e) { println(report("error at or after byte " + instr.getPC())); break; } } for (InstructionDetailWriter w: detailWriters) w.flush(); } public void writeInstr(Instruction instr) { print(String.format("%4d: %-13s ", instr.getPC(), instr.getMnemonic())); // compute the number of indentations for the body of multi-line instructions // This is 6 (the width of "%4d: "), divided by the width of each indentation level, // and rounded up to the next integer. int indentWidth = options.indentWidth; int indent = (6 + indentWidth - 1) / indentWidth; instr.accept(instructionPrinter, indent); println(); } // where Instruction.KindVisitor instructionPrinter = new Instruction.KindVisitor<>() { public Void visitNoOperands(Instruction instr, Integer indent) { return null; } public Void visitArrayType(Instruction instr, TypeKind kind, Integer indent) { print(" " + kind.name); return null; } public Void visitBranch(Instruction instr, int offset, Integer indent) { print((instr.getPC() + offset)); return null; } public Void visitConstantPoolRef(Instruction instr, int index, Integer indent) { print("#" + index); tab(); print("// "); printConstant(index); return null; } public Void visitConstantPoolRefAndValue(Instruction instr, int index, int value, Integer indent) { print("#" + index + ", " + value); tab(); print("// "); printConstant(index); return null; } public Void visitLocal(Instruction instr, int index, Integer indent) { print(index); return null; } public Void visitLocalAndValue(Instruction instr, int index, int value, Integer indent) { print(index + ", " + value); return null; } public Void visitLookupSwitch(Instruction instr, int default_, int npairs, int[] matches, int[] offsets, Integer indent) { int pc = instr.getPC(); print("{ // " + npairs); indent(indent); for (int i = 0; i < npairs; i++) { print(String.format("%n%12d: %d", matches[i], (pc + offsets[i]))); } print("\n default: " + (pc + default_) + "\n}"); indent(-indent); return null; } public Void visitTableSwitch(Instruction instr, int default_, int low, int high, int[] offsets, Integer indent) { int pc = instr.getPC(); print("{ // " + low + " to " + high); indent(indent); for (int i = 0; i < offsets.length; i++) { print(String.format("%n%12d: %d", (low + i), (pc + offsets[i]))); } print("\n default: " + (pc + default_) + "\n}"); indent(-indent); return null; } public Void visitValue(Instruction instr, int value, Integer indent) { print(value); return null; } public Void visitUnknown(Instruction instr, Integer indent) { return null; } }; public void writeExceptionTable(Code_attribute attr) { if (attr.exception_table_length > 0) { println("Exception table:"); indent(+1); println(" from to target type"); for (int i = 0; i < attr.exception_table.length; i++) { Code_attribute.Exception_data handler = attr.exception_table[i]; print(String.format(" %5d %5d %5d", handler.start_pc, handler.end_pc, handler.handler_pc)); print(" "); int catch_type = handler.catch_type; if (catch_type == 0) { println("any"); } else { print("Class "); println(constantWriter.stringValue(catch_type)); } } indent(-1); } } private void printConstant(int index) { constantWriter.write(index); } private List getDetailWriters(Code_attribute attr) { List detailWriters = new ArrayList<>(); if (options.details.contains(InstructionDetailWriter.Kind.SOURCE)) { sourceWriter.reset(classWriter.getClassFile(), attr); if (sourceWriter.hasSource()) detailWriters.add(sourceWriter); else println("(Source code not available)"); } if (options.details.contains(InstructionDetailWriter.Kind.LOCAL_VARS)) { localVariableTableWriter.reset(attr); detailWriters.add(localVariableTableWriter); } if (options.details.contains(InstructionDetailWriter.Kind.LOCAL_VAR_TYPES)) { localVariableTypeTableWriter.reset(attr); detailWriters.add(localVariableTypeTableWriter); } if (options.details.contains(InstructionDetailWriter.Kind.STACKMAPS)) { stackMapWriter.reset(attr); stackMapWriter.writeInitialDetails(); detailWriters.add(stackMapWriter); } if (options.details.contains(InstructionDetailWriter.Kind.TRY_BLOCKS)) { tryBlockWriter.reset(attr); detailWriters.add(tryBlockWriter); } if (options.details.contains(InstructionDetailWriter.Kind.TYPE_ANNOS)) { typeAnnotationWriter.reset(attr); detailWriters.add(typeAnnotationWriter); } return detailWriters; } private AttributeWriter attrWriter; private ClassWriter classWriter; private ConstantWriter constantWriter; private LocalVariableTableWriter localVariableTableWriter; private LocalVariableTypeTableWriter localVariableTypeTableWriter; private TypeAnnotationWriter typeAnnotationWriter; private SourceWriter sourceWriter; private StackMapWriter stackMapWriter; private TryBlockWriter tryBlockWriter; private Options options; }





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