| /* |
| * Copyright (c) 2001, 2004, 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 sun.reflect; |
| |
| class ClassFileAssembler implements ClassFileConstants { |
| private ByteVector vec; |
| private short cpIdx = 0; |
| |
| public ClassFileAssembler() { |
| this(ByteVectorFactory.create()); |
| } |
| |
| public ClassFileAssembler(ByteVector vec) { |
| this.vec = vec; |
| } |
| |
| public ByteVector getData() { |
| return vec; |
| } |
| |
| /** Length in bytes */ |
| public short getLength() { |
| return (short) vec.getLength(); |
| } |
| |
| public void emitMagicAndVersion() { |
| emitInt(0xCAFEBABE); |
| emitShort((short) 0); |
| emitShort((short) 49); |
| } |
| |
| public void emitInt(int val) { |
| emitByte((byte) (val >> 24)); |
| emitByte((byte) ((val >> 16) & 0xFF)); |
| emitByte((byte) ((val >> 8) & 0xFF)); |
| emitByte((byte) (val & 0xFF)); |
| } |
| |
| public void emitShort(short val) { |
| emitByte((byte) ((val >> 8) & 0xFF)); |
| emitByte((byte) (val & 0xFF)); |
| } |
| |
| // Support for labels; package-private |
| void emitShort(short bci, short val) { |
| vec.put(bci, (byte) ((val >> 8) & 0xFF)); |
| vec.put(bci + 1, (byte) (val & 0xFF)); |
| } |
| |
| public void emitByte(byte val) { |
| vec.add(val); |
| } |
| |
| public void append(ClassFileAssembler asm) { |
| append(asm.vec); |
| } |
| |
| public void append(ByteVector vec) { |
| for (int i = 0; i < vec.getLength(); i++) { |
| emitByte(vec.get(i)); |
| } |
| } |
| |
| /** Keeps track of the current (one-based) constant pool index; |
| incremented after emitting one of the following constant pool |
| entries. Can fetch the current constant pool index for use in |
| later entries. Index points at the last valid constant pool |
| entry; initially invalid. It is illegal to fetch the constant |
| pool index before emitting at least one constant pool entry. */ |
| public short cpi() { |
| if (cpIdx == 0) { |
| throw new RuntimeException("Illegal use of ClassFileAssembler"); |
| } |
| return cpIdx; |
| } |
| |
| public void emitConstantPoolUTF8(String str) { |
| // NOTE: can not use str.getBytes("UTF-8") here because of |
| // bootstrapping issues with the character set converters. |
| byte[] bytes = UTF8.encode(str); |
| emitByte(CONSTANT_Utf8); |
| emitShort((short) bytes.length); |
| for (int i = 0; i < bytes.length; i++) { |
| emitByte(bytes[i]); |
| } |
| cpIdx++; |
| } |
| |
| public void emitConstantPoolClass(short index) { |
| emitByte(CONSTANT_Class); |
| emitShort(index); |
| cpIdx++; |
| } |
| |
| public void emitConstantPoolNameAndType(short nameIndex, short typeIndex) { |
| emitByte(CONSTANT_NameAndType); |
| emitShort(nameIndex); |
| emitShort(typeIndex); |
| cpIdx++; |
| } |
| |
| public void emitConstantPoolFieldref |
| (short classIndex, short nameAndTypeIndex) |
| { |
| emitByte(CONSTANT_Fieldref); |
| emitShort(classIndex); |
| emitShort(nameAndTypeIndex); |
| cpIdx++; |
| } |
| |
| public void emitConstantPoolMethodref |
| (short classIndex, short nameAndTypeIndex) |
| { |
| emitByte(CONSTANT_Methodref); |
| emitShort(classIndex); |
| emitShort(nameAndTypeIndex); |
| cpIdx++; |
| } |
| |
| public void emitConstantPoolInterfaceMethodref |
| (short classIndex, short nameAndTypeIndex) |
| { |
| emitByte(CONSTANT_InterfaceMethodref); |
| emitShort(classIndex); |
| emitShort(nameAndTypeIndex); |
| cpIdx++; |
| } |
| |
| public void emitConstantPoolString(short utf8Index) { |
| emitByte(CONSTANT_String); |
| emitShort(utf8Index); |
| cpIdx++; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Opcodes. Keeps track of maximum stack and locals. Make a new |
| // assembler for each piece of assembled code, then append the |
| // result to the previous assembler's class file. |
| // |
| |
| private int stack = 0; |
| private int maxStack = 0; |
| private int maxLocals = 0; |
| |
| private void incStack() { |
| setStack(stack + 1); |
| } |
| |
| private void decStack() { |
| --stack; |
| } |
| |
| public short getMaxStack() { |
| return (short) maxStack; |
| } |
| |
| public short getMaxLocals() { |
| return (short) maxLocals; |
| } |
| |
| /** It's necessary to be able to specify the number of arguments at |
| the beginning of the method (which translates to the initial |
| value of max locals) */ |
| public void setMaxLocals(int maxLocals) { |
| this.maxLocals = maxLocals; |
| } |
| |
| /** Needed to do flow control. Returns current stack depth. */ |
| public int getStack() { |
| return stack; |
| } |
| |
| /** Needed to do flow control. */ |
| public void setStack(int value) { |
| stack = value; |
| if (stack > maxStack) { |
| maxStack = stack; |
| } |
| } |
| |
| /////////////// |
| // Constants // |
| /////////////// |
| |
| public void opc_aconst_null() { |
| emitByte(opc_aconst_null); |
| incStack(); |
| } |
| |
| public void opc_sipush(short constant) { |
| emitByte(opc_sipush); |
| emitShort(constant); |
| incStack(); |
| } |
| |
| public void opc_ldc(byte cpIdx) { |
| emitByte(opc_ldc); |
| emitByte(cpIdx); |
| incStack(); |
| } |
| |
| ///////////////////////////////////// |
| // Local variable loads and stores // |
| ///////////////////////////////////// |
| |
| public void opc_iload_0() { |
| emitByte(opc_iload_0); |
| if (maxLocals < 1) maxLocals = 1; |
| incStack(); |
| } |
| |
| public void opc_iload_1() { |
| emitByte(opc_iload_1); |
| if (maxLocals < 2) maxLocals = 2; |
| incStack(); |
| } |
| |
| public void opc_iload_2() { |
| emitByte(opc_iload_2); |
| if (maxLocals < 3) maxLocals = 3; |
| incStack(); |
| } |
| |
| public void opc_iload_3() { |
| emitByte(opc_iload_3); |
| if (maxLocals < 4) maxLocals = 4; |
| incStack(); |
| } |
| |
| public void opc_lload_0() { |
| emitByte(opc_lload_0); |
| if (maxLocals < 2) maxLocals = 2; |
| incStack(); |
| incStack(); |
| } |
| |
| public void opc_lload_1() { |
| emitByte(opc_lload_1); |
| if (maxLocals < 3) maxLocals = 3; |
| incStack(); |
| incStack(); |
| } |
| |
| public void opc_lload_2() { |
| emitByte(opc_lload_2); |
| if (maxLocals < 4) maxLocals = 4; |
| incStack(); |
| incStack(); |
| } |
| |
| public void opc_lload_3() { |
| emitByte(opc_lload_3); |
| if (maxLocals < 5) maxLocals = 5; |
| incStack(); |
| incStack(); |
| } |
| |
| public void opc_fload_0() { |
| emitByte(opc_fload_0); |
| if (maxLocals < 1) maxLocals = 1; |
| incStack(); |
| } |
| |
| public void opc_fload_1() { |
| emitByte(opc_fload_1); |
| if (maxLocals < 2) maxLocals = 2; |
| incStack(); |
| } |
| |
| public void opc_fload_2() { |
| emitByte(opc_fload_2); |
| if (maxLocals < 3) maxLocals = 3; |
| incStack(); |
| } |
| |
| public void opc_fload_3() { |
| emitByte(opc_fload_3); |
| if (maxLocals < 4) maxLocals = 4; |
| incStack(); |
| } |
| |
| public void opc_dload_0() { |
| emitByte(opc_dload_0); |
| if (maxLocals < 2) maxLocals = 2; |
| incStack(); |
| incStack(); |
| } |
| |
| public void opc_dload_1() { |
| emitByte(opc_dload_1); |
| if (maxLocals < 3) maxLocals = 3; |
| incStack(); |
| incStack(); |
| } |
| |
| public void opc_dload_2() { |
| emitByte(opc_dload_2); |
| if (maxLocals < 4) maxLocals = 4; |
| incStack(); |
| incStack(); |
| } |
| |
| public void opc_dload_3() { |
| emitByte(opc_dload_3); |
| if (maxLocals < 5) maxLocals = 5; |
| incStack(); |
| incStack(); |
| } |
| |
| public void opc_aload_0() { |
| emitByte(opc_aload_0); |
| if (maxLocals < 1) maxLocals = 1; |
| incStack(); |
| } |
| |
| public void opc_aload_1() { |
| emitByte(opc_aload_1); |
| if (maxLocals < 2) maxLocals = 2; |
| incStack(); |
| } |
| |
| public void opc_aload_2() { |
| emitByte(opc_aload_2); |
| if (maxLocals < 3) maxLocals = 3; |
| incStack(); |
| } |
| |
| public void opc_aload_3() { |
| emitByte(opc_aload_3); |
| if (maxLocals < 4) maxLocals = 4; |
| incStack(); |
| } |
| |
| public void opc_aaload() { |
| emitByte(opc_aaload); |
| decStack(); |
| } |
| |
| public void opc_astore_0() { |
| emitByte(opc_astore_0); |
| if (maxLocals < 1) maxLocals = 1; |
| decStack(); |
| } |
| |
| public void opc_astore_1() { |
| emitByte(opc_astore_1); |
| if (maxLocals < 2) maxLocals = 2; |
| decStack(); |
| } |
| |
| public void opc_astore_2() { |
| emitByte(opc_astore_2); |
| if (maxLocals < 3) maxLocals = 3; |
| decStack(); |
| } |
| |
| public void opc_astore_3() { |
| emitByte(opc_astore_3); |
| if (maxLocals < 4) maxLocals = 4; |
| decStack(); |
| } |
| |
| //////////////////////// |
| // Stack manipulation // |
| //////////////////////// |
| |
| public void opc_pop() { |
| emitByte(opc_pop); |
| decStack(); |
| } |
| |
| public void opc_dup() { |
| emitByte(opc_dup); |
| incStack(); |
| } |
| |
| public void opc_dup_x1() { |
| emitByte(opc_dup_x1); |
| incStack(); |
| } |
| |
| public void opc_swap() { |
| emitByte(opc_swap); |
| } |
| |
| /////////////////////////////// |
| // Widening conversions only // |
| /////////////////////////////// |
| |
| public void opc_i2l() { |
| emitByte(opc_i2l); |
| } |
| |
| public void opc_i2f() { |
| emitByte(opc_i2f); |
| } |
| |
| public void opc_i2d() { |
| emitByte(opc_i2d); |
| } |
| |
| public void opc_l2f() { |
| emitByte(opc_l2f); |
| } |
| |
| public void opc_l2d() { |
| emitByte(opc_l2d); |
| } |
| |
| public void opc_f2d() { |
| emitByte(opc_f2d); |
| } |
| |
| ////////////////// |
| // Control flow // |
| ////////////////// |
| |
| public void opc_ifeq(short bciOffset) { |
| emitByte(opc_ifeq); |
| emitShort(bciOffset); |
| decStack(); |
| } |
| |
| /** Control flow with forward-reference BCI. Stack assumes |
| straight-through control flow. */ |
| public void opc_ifeq(Label l) { |
| short instrBCI = getLength(); |
| emitByte(opc_ifeq); |
| l.add(this, instrBCI, getLength(), getStack() - 1); |
| emitShort((short) -1); // Must be patched later |
| } |
| |
| public void opc_if_icmpeq(short bciOffset) { |
| emitByte(opc_if_icmpeq); |
| emitShort(bciOffset); |
| setStack(getStack() - 2); |
| } |
| |
| /** Control flow with forward-reference BCI. Stack assumes straight |
| control flow. */ |
| public void opc_if_icmpeq(Label l) { |
| short instrBCI = getLength(); |
| emitByte(opc_if_icmpeq); |
| l.add(this, instrBCI, getLength(), getStack() - 2); |
| emitShort((short) -1); // Must be patched later |
| } |
| |
| public void opc_goto(short bciOffset) { |
| emitByte(opc_goto); |
| emitShort(bciOffset); |
| } |
| |
| /** Control flow with forward-reference BCI. Stack assumes straight |
| control flow. */ |
| public void opc_goto(Label l) { |
| short instrBCI = getLength(); |
| emitByte(opc_goto); |
| l.add(this, instrBCI, getLength(), getStack()); |
| emitShort((short) -1); // Must be patched later |
| } |
| |
| public void opc_ifnull(short bciOffset) { |
| emitByte(opc_ifnull); |
| emitShort(bciOffset); |
| decStack(); |
| } |
| |
| /** Control flow with forward-reference BCI. Stack assumes straight |
| control flow. */ |
| public void opc_ifnull(Label l) { |
| short instrBCI = getLength(); |
| emitByte(opc_ifnull); |
| l.add(this, instrBCI, getLength(), getStack() - 1); |
| emitShort((short) -1); // Must be patched later |
| decStack(); |
| } |
| |
| public void opc_ifnonnull(short bciOffset) { |
| emitByte(opc_ifnonnull); |
| emitShort(bciOffset); |
| decStack(); |
| } |
| |
| /** Control flow with forward-reference BCI. Stack assumes straight |
| control flow. */ |
| public void opc_ifnonnull(Label l) { |
| short instrBCI = getLength(); |
| emitByte(opc_ifnonnull); |
| l.add(this, instrBCI, getLength(), getStack() - 1); |
| emitShort((short) -1); // Must be patched later |
| decStack(); |
| } |
| |
| ///////////////////////// |
| // Return instructions // |
| ///////////////////////// |
| |
| public void opc_ireturn() { |
| emitByte(opc_ireturn); |
| setStack(0); |
| } |
| |
| public void opc_lreturn() { |
| emitByte(opc_lreturn); |
| setStack(0); |
| } |
| |
| public void opc_freturn() { |
| emitByte(opc_freturn); |
| setStack(0); |
| } |
| |
| public void opc_dreturn() { |
| emitByte(opc_dreturn); |
| setStack(0); |
| } |
| |
| public void opc_areturn() { |
| emitByte(opc_areturn); |
| setStack(0); |
| } |
| |
| public void opc_return() { |
| emitByte(opc_return); |
| setStack(0); |
| } |
| |
| ////////////////////// |
| // Field operations // |
| ////////////////////// |
| |
| public void opc_getstatic(short fieldIndex, int fieldSizeInStackSlots) { |
| emitByte(opc_getstatic); |
| emitShort(fieldIndex); |
| setStack(getStack() + fieldSizeInStackSlots); |
| } |
| |
| public void opc_putstatic(short fieldIndex, int fieldSizeInStackSlots) { |
| emitByte(opc_putstatic); |
| emitShort(fieldIndex); |
| setStack(getStack() - fieldSizeInStackSlots); |
| } |
| |
| public void opc_getfield(short fieldIndex, int fieldSizeInStackSlots) { |
| emitByte(opc_getfield); |
| emitShort(fieldIndex); |
| setStack(getStack() + fieldSizeInStackSlots - 1); |
| } |
| |
| public void opc_putfield(short fieldIndex, int fieldSizeInStackSlots) { |
| emitByte(opc_putfield); |
| emitShort(fieldIndex); |
| setStack(getStack() - fieldSizeInStackSlots - 1); |
| } |
| |
| //////////////////////// |
| // Method invocations // |
| //////////////////////// |
| |
| /** Long and double arguments and return types count as 2 arguments; |
| other values count as 1. */ |
| public void opc_invokevirtual(short methodIndex, |
| int numArgs, |
| int numReturnValues) |
| { |
| emitByte(opc_invokevirtual); |
| emitShort(methodIndex); |
| setStack(getStack() - numArgs - 1 + numReturnValues); |
| } |
| |
| /** Long and double arguments and return types count as 2 arguments; |
| other values count as 1. */ |
| public void opc_invokespecial(short methodIndex, |
| int numArgs, |
| int numReturnValues) |
| { |
| emitByte(opc_invokespecial); |
| emitShort(methodIndex); |
| setStack(getStack() - numArgs - 1 + numReturnValues); |
| } |
| |
| /** Long and double arguments and return types count as 2 arguments; |
| other values count as 1. */ |
| public void opc_invokestatic(short methodIndex, |
| int numArgs, |
| int numReturnValues) |
| { |
| emitByte(opc_invokestatic); |
| emitShort(methodIndex); |
| setStack(getStack() - numArgs + numReturnValues); |
| } |
| |
| /** Long and double arguments and return types count as 2 arguments; |
| other values count as 1. */ |
| public void opc_invokeinterface(short methodIndex, |
| int numArgs, |
| byte count, |
| int numReturnValues) |
| { |
| emitByte(opc_invokeinterface); |
| emitShort(methodIndex); |
| emitByte(count); |
| emitByte((byte) 0); |
| setStack(getStack() - numArgs - 1 + numReturnValues); |
| } |
| |
| ////////////////// |
| // Array length // |
| ////////////////// |
| |
| public void opc_arraylength() { |
| emitByte(opc_arraylength); |
| } |
| |
| ///////// |
| // New // |
| ///////// |
| |
| public void opc_new(short classIndex) { |
| emitByte(opc_new); |
| emitShort(classIndex); |
| incStack(); |
| } |
| |
| //////////// |
| // Athrow // |
| //////////// |
| |
| public void opc_athrow() { |
| emitByte(opc_athrow); |
| setStack(1); |
| } |
| |
| ////////////////////////////// |
| // Checkcast and instanceof // |
| ////////////////////////////// |
| |
| /** Assumes the checkcast succeeds */ |
| public void opc_checkcast(short classIndex) { |
| emitByte(opc_checkcast); |
| emitShort(classIndex); |
| } |
| |
| public void opc_instanceof(short classIndex) { |
| emitByte(opc_instanceof); |
| emitShort(classIndex); |
| } |
| } |