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/* Soot - a J*va Optimization Framework
* Copyright (C) 1997 Clark Verbrugge
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the Sable Research Group and others 1997-1999.
* See the 'credits' file distributed with Soot for the complete list of
* contributors. (Soot is distributed at http://www.sable.mcgill.ca/soot)
*/
package soot.coffi;
import soot.*;
/** Procedural code for parsing and otherwise handling bytecode.
* @author Clark Verbrugge
*/
class ByteCode {
public static final int NOP = 0;
public static final int ACONST_NULL = 1;
public static final int ICONST_M1 = 2;
public static final int ICONST_0 = 3;
public static final int ICONST_1 = 4;
public static final int ICONST_2 = 5;
public static final int ICONST_3 = 6;
public static final int ICONST_4 = 7;
public static final int ICONST_5 = 8;
public static final int LCONST_0 = 9;
public static final int LCONST_1 = 10;
public static final int FCONST_0 = 11;
public static final int FCONST_1 = 12;
public static final int FCONST_2 = 13;
public static final int DCONST_0 = 14;
public static final int DCONST_1 = 15;
public static final int BIPUSH = 16;
public static final int SIPUSH = 17;
public static final int LDC1 = 18;
public static final int LDC2 = 19;
public static final int LDC2W = 20;
public static final int ILOAD = 21;
public static final int LLOAD = 22;
public static final int FLOAD = 23;
public static final int DLOAD = 24;
public static final int ALOAD = 25;
public static final int ILOAD_0 = 26;
public static final int ILOAD_1 = 27;
public static final int ILOAD_2 = 28;
public static final int ILOAD_3 = 29;
public static final int LLOAD_0 = 30;
public static final int LLOAD_1 = 31;
public static final int LLOAD_2 = 32;
public static final int LLOAD_3 = 33;
public static final int FLOAD_0 = 34;
public static final int FLOAD_1 = 35;
public static final int FLOAD_2 = 36;
public static final int FLOAD_3 = 37;
public static final int DLOAD_0 = 38;
public static final int DLOAD_1 = 39;
public static final int DLOAD_2 = 40;
public static final int DLOAD_3 = 41;
public static final int ALOAD_0 = 42;
public static final int ALOAD_1 = 43;
public static final int ALOAD_2 = 44;
public static final int ALOAD_3 = 45;
public static final int IALOAD = 46;
public static final int LALOAD = 47;
public static final int FALOAD = 48;
public static final int DALOAD = 49;
public static final int AALOAD = 50;
public static final int BALOAD = 51;
public static final int CALOAD = 52;
public static final int SALOAD = 53;
public static final int ISTORE = 54;
public static final int LSTORE = 55;
public static final int FSTORE = 56;
public static final int DSTORE = 57;
public static final int ASTORE = 58;
public static final int ISTORE_0 = 59;
public static final int ISTORE_1 = 60;
public static final int ISTORE_2 = 61;
public static final int ISTORE_3 = 62;
public static final int LSTORE_0 = 63;
public static final int LSTORE_1 = 64;
public static final int LSTORE_2 = 65;
public static final int LSTORE_3 = 66;
public static final int FSTORE_0 = 67;
public static final int FSTORE_1 = 68;
public static final int FSTORE_2 = 69;
public static final int FSTORE_3 = 70;
public static final int DSTORE_0 = 71;
public static final int DSTORE_1 = 72;
public static final int DSTORE_2 = 73;
public static final int DSTORE_3 = 74;
public static final int ASTORE_0 = 75;
public static final int ASTORE_1 = 76;
public static final int ASTORE_2 = 77;
public static final int ASTORE_3 = 78;
public static final int IASTORE = 79;
public static final int LASTORE = 80;
public static final int FASTORE = 81;
public static final int DASTORE = 82;
public static final int AASTORE = 83;
public static final int BASTORE = 84;
public static final int CASTORE = 85;
public static final int SASTORE = 86;
public static final int POP = 87;
public static final int POP2 = 88;
public static final int DUP = 89;
public static final int DUP_X1 = 90;
public static final int DUP_X2 = 91;
public static final int DUP2 = 92;
public static final int DUP2_X1 = 93;
public static final int DUP2_X2 = 94;
public static final int SWAP = 95;
public static final int IADD = 96;
public static final int LADD = 97;
public static final int FADD = 98;
public static final int DADD = 99;
public static final int ISUB = 100;
public static final int LSUB = 101;
public static final int FSUB = 102;
public static final int DSUB = 103;
public static final int IMUL = 104;
public static final int LMUL = 105;
public static final int FMUL = 106;
public static final int DMUL = 107;
public static final int IDIV = 108;
public static final int LDIV = 109;
public static final int FDIV = 110;
public static final int DDIV = 111;
public static final int IREM = 112;
public static final int LREM = 113;
public static final int FREM = 114;
public static final int DREM = 115;
public static final int INEG = 116;
public static final int LNEG = 117;
public static final int FNEG = 118;
public static final int DNEG = 119;
public static final int ISHL = 120;
public static final int LSHL = 121;
public static final int ISHR = 122;
public static final int LSHR = 123;
public static final int IUSHR = 124;
public static final int LUSHR = 125;
public static final int IAND = 126;
public static final int LAND = 127;
public static final int IOR = 128;
public static final int LOR = 129;
public static final int IXOR = 130;
public static final int LXOR = 131;
public static final int IINC = 132;
public static final int I2L = 133;
public static final int I2F = 134;
public static final int I2D = 135;
public static final int L2I = 136;
public static final int L2F = 137;
public static final int L2D = 138;
public static final int F2I = 139;
public static final int F2L = 140;
public static final int F2D = 141;
public static final int D2I = 142;
public static final int D2L = 143;
public static final int D2F = 144;
public static final int INT2BYTE = 145;
public static final int INT2CHAR = 146;
public static final int INT2SHORT = 147;
public static final int LCMP = 148;
public static final int FCMPL = 149;
public static final int FCMPG = 150;
public static final int DCMPL = 151;
public static final int DCMPG = 152;
public static final int IFEQ = 153;
public static final int IFNE = 154;
public static final int IFLT = 155;
public static final int IFGE = 156;
public static final int IFGT = 157;
public static final int IFLE = 158;
public static final int IF_ICMPEQ = 159;
public static final int IF_ICMPNE = 160;
public static final int IF_ICMPLT = 161;
public static final int IF_ICMPGE = 162;
public static final int IF_ICMPGT = 163;
public static final int IF_ICMPLE = 164;
public static final int IF_ACMPEQ = 165;
public static final int IF_ACMPNE = 166;
public static final int GOTO = 167;
public static final int JSR = 168;
public static final int RET = 169;
public static final int TABLESWITCH = 170;
public static final int LOOKUPSWITCH = 171;
public static final int IRETURN = 172;
public static final int LRETURN = 173;
public static final int FRETURN = 174;
public static final int DRETURN = 175;
public static final int ARETURN = 176;
public static final int RETURN = 177;
public static final int GETSTATIC = 178;
public static final int PUTSTATIC = 179;
public static final int GETFIELD = 180;
public static final int PUTFIELD = 181;
public static final int INVOKEVIRTUAL = 182;
public static final int INVOKENONVIRTUAL = 183;
public static final int INVOKESTATIC = 184;
public static final int INVOKEINTERFACE = 185;
public static final int INVOKEDYNAMIC = 186;
public static final int NEW = 187;
public static final int NEWARRAY = 188;
public static final int ANEWARRAY = 189;
public static final int ARRAYLENGTH = 190;
public static final int ATHROW = 191;
public static final int CHECKCAST = 192;
public static final int INSTANCEOF = 193;
public static final int MONITORENTER = 194;
public static final int MONITOREXIT = 195;
public static final int WIDE = 196;
public static final int MULTIANEWARRAY = 197;
public static final int IFNULL = 198;
public static final int IFNONNULL = 199;
public static final int GOTO_W = 200;
public static final int JSR_W = 201;
public static final int BREAKPOINT = 202;
/* public static final int = 203;
public static final int = 204;
public static final int = 205;
public static final int = 206;
public static final int = 207;
public static final int = 208;*/
public static final int RET_W = 209;
/* public static final int = 210;
public static final int = 211;
public static final int = 212;
public static final int = 213;
public static final int = 214;
public static final int = 215;
public static final int = 216;
public static final int = 217;
public static final int = 218;
public static final int = 219;
public static final int = 220;
public static final int = 221;
public static final int = 222;
public static final int = 223;
public static final int = 224;
public static final int = 225;
public static final int = 226;
public static final int = 227;
public static final int = 228;
public static final int = 229;
public static final int = 230;
public static final int = 231;
public static final int = 232;
public static final int = 233;
public static final int = 234;
public static final int = 235;
public static final int = 236;
public static final int = 237;
public static final int = 238;
public static final int = 239;
public static final int = 240;
public static final int = 241;
public static final int = 242;
public static final int = 243;
public static final int = 244;
public static final int = 245;
public static final int = 246;
public static final int = 247;
public static final int = 248;
public static final int = 249;
public static final int = 250;
public static final int = 251;
public static final int = 252;
public static final int = 253;
public static final int = 254;
public static final int = 255;*/
private int icount;
private Instruction instructions[];
/** Constructor---does nothing. */
ByteCode() { }
/** Main.v() entry point for disassembling bytecode into Instructions; this
* method converts the given single bytecode into an Instruction (with
* label set to index).
* @param bc complete array of bytecode.
* @param index offset within bc of the bytecode to parse.
* @return a single Instruction object; note that Instruction references will
* not be filled in (use build to post-process).
* @see ClassFile#parseMethod
* @see Instruction#parse
* @see ByteCode#build
*/
public Instruction disassemble_bytecode(byte bc[],int index) {
// returns a string representing the disassembly of the
// bytecode at the given index
byte b = bc[index];
boolean isWide = false;
Instruction i;
int x;
x = (b)&0xff;
switch(x) {
case BIPUSH:
i = new Instruction_Bipush();
break;
case SIPUSH:
i = new Instruction_Sipush();
break;
case LDC1:
i = new Instruction_Ldc1();
break;
case LDC2:
i = new Instruction_Ldc2();
break;
case LDC2W:
i = new Instruction_Ldc2w();
break;
case ACONST_NULL:
i = new Instruction_Aconst_null();
break;
case ICONST_M1:
i = new Instruction_Iconst_m1();
break;
case ICONST_0:
i = new Instruction_Iconst_0();
break;
case ICONST_1:
i = new Instruction_Iconst_1();
break;
case ICONST_2:
i = new Instruction_Iconst_2();
break;
case ICONST_3:
i = new Instruction_Iconst_3();
break;
case ICONST_4:
i = new Instruction_Iconst_4();
break;
case ICONST_5:
i = new Instruction_Iconst_5();
break;
case LCONST_0:
i = new Instruction_Lconst_0();
break;
case LCONST_1:
i = new Instruction_Lconst_1();
break;
case FCONST_0:
i = new Instruction_Fconst_0();
break;
case FCONST_1:
i = new Instruction_Fconst_1();
break;
case FCONST_2:
i = new Instruction_Fconst_2();
break;
case DCONST_0:
i = new Instruction_Dconst_0();
break;
case DCONST_1:
i = new Instruction_Dconst_1();
break;
case ILOAD:
i = new Instruction_Iload();
break;
case ILOAD_0:
i = new Instruction_Iload_0();
break;
case ILOAD_1:
i = new Instruction_Iload_1();
break;
case ILOAD_2:
i = new Instruction_Iload_2();
break;
case ILOAD_3:
i = new Instruction_Iload_3();
break;
case LLOAD:
i = new Instruction_Lload();
break;
case LLOAD_0:
i = new Instruction_Lload_0();
break;
case LLOAD_1:
i = new Instruction_Lload_1();
break;
case LLOAD_2:
i = new Instruction_Lload_2();
break;
case LLOAD_3:
i = new Instruction_Lload_3();
break;
case FLOAD:
i = new Instruction_Fload();
break;
case FLOAD_0:
i = new Instruction_Fload_0();
break;
case FLOAD_1:
i = new Instruction_Fload_1();
break;
case FLOAD_2:
i = new Instruction_Fload_2();
break;
case FLOAD_3:
i = new Instruction_Fload_3();
break;
case DLOAD:
i = new Instruction_Dload();
break;
case DLOAD_0:
i = new Instruction_Dload_0();
break;
case DLOAD_1:
i = new Instruction_Dload_1();
break;
case DLOAD_2:
i = new Instruction_Dload_2();
break;
case DLOAD_3:
i = new Instruction_Dload_3();
break;
case ALOAD:
i = new Instruction_Aload();
break;
case ALOAD_0:
i = new Instruction_Aload_0();
break;
case ALOAD_1:
i = new Instruction_Aload_1();
break;
case ALOAD_2:
i = new Instruction_Aload_2();
break;
case ALOAD_3:
i = new Instruction_Aload_3();
break;
case ISTORE:
i = new Instruction_Istore();
break;
case ISTORE_0:
i = new Instruction_Istore_0();
break;
case ISTORE_1:
i = new Instruction_Istore_1();
break;
case ISTORE_2:
i = new Instruction_Istore_2();
break;
case ISTORE_3:
i = new Instruction_Istore_3();
break;
case LSTORE:
i = new Instruction_Lstore();
break;
case LSTORE_0:
i = new Instruction_Lstore_0();
break;
case LSTORE_1:
i = new Instruction_Lstore_1();
break;
case LSTORE_2:
i = new Instruction_Lstore_2();
break;
case LSTORE_3:
i = new Instruction_Lstore_3();
break;
case FSTORE:
i = new Instruction_Fstore();
break;
case FSTORE_0:
i = new Instruction_Fstore_0();
break;
case FSTORE_1:
i = new Instruction_Fstore_1();
break;
case FSTORE_2:
i = new Instruction_Fstore_2();
break;
case FSTORE_3:
i = new Instruction_Fstore_3();
break;
case DSTORE:
i = new Instruction_Dstore();
break;
case DSTORE_0:
i = new Instruction_Dstore_0();
break;
case DSTORE_1:
i = new Instruction_Dstore_1();
break;
case DSTORE_2:
i = new Instruction_Dstore_2();
break;
case DSTORE_3:
i = new Instruction_Dstore_3();
break;
case ASTORE:
i = new Instruction_Astore();
break;
case ASTORE_0:
i = new Instruction_Astore_0();
break;
case ASTORE_1:
i = new Instruction_Astore_1();
break;
case ASTORE_2:
i = new Instruction_Astore_2();
break;
case ASTORE_3:
i = new Instruction_Astore_3();
break;
case IINC:
i = new Instruction_Iinc();
break;
case WIDE:
{
int nextIndex = (bc[index+1]) & 0xff;
switch(nextIndex)
{
case ILOAD:
i = new Instruction_Iload();
break;
case FLOAD:
i = new Instruction_Fload();
break;
case ALOAD:
i = new Instruction_Aload();
break;
case LLOAD:
i = new Instruction_Lload();
break;
case DLOAD:
i = new Instruction_Dload();
break;
case ISTORE:
i = new Instruction_Istore();
break;
case FSTORE:
i = new Instruction_Fstore();
break;
case ASTORE:
i = new Instruction_Astore();
break;
case LSTORE:
i = new Instruction_Lstore();
break;
case DSTORE:
i = new Instruction_Dstore();
break;
case RET:
i = new Instruction_Ret();
break;
case IINC:
i = new Instruction_Iinc();
break;
default:
throw new RuntimeException("invalid wide instruction: " + nextIndex);
}
((Instruction_bytevar) i).isWide = true;
isWide = true;
}
break;
case NEWARRAY:
i = new Instruction_Newarray();
break;
case ANEWARRAY:
i = new Instruction_Anewarray();
break;
case MULTIANEWARRAY:
i = new Instruction_Multianewarray();
break;
case ARRAYLENGTH:
i = new Instruction_Arraylength();
break;
case IALOAD:
i = new Instruction_Iaload();
break;
case LALOAD:
i = new Instruction_Laload();
break;
case FALOAD:
i = new Instruction_Faload();
break;
case DALOAD:
i = new Instruction_Daload();
break;
case AALOAD:
i = new Instruction_Aaload();
break;
case BALOAD:
i = new Instruction_Baload();
break;
case CALOAD:
i = new Instruction_Caload();
break;
case SALOAD:
i = new Instruction_Saload();
break;
case IASTORE:
i = new Instruction_Iastore();
break;
case LASTORE:
i = new Instruction_Lastore();
break;
case FASTORE:
i = new Instruction_Fastore();
break;
case DASTORE:
i = new Instruction_Dastore();
break;
case AASTORE:
i = new Instruction_Aastore();
break;
case BASTORE:
i = new Instruction_Bastore();
break;
case CASTORE:
i = new Instruction_Castore();
break;
case SASTORE:
i = new Instruction_Sastore();
break;
case NOP:
i = new Instruction_Nop();
break;
case POP:
i = new Instruction_Pop();
break;
case POP2:
i = new Instruction_Pop2();
break;
case DUP:
i = new Instruction_Dup();
break;
case DUP2:
i = new Instruction_Dup2();
break;
case DUP_X1:
i = new Instruction_Dup_x1();
break;
case DUP_X2:
i = new Instruction_Dup_x2();
break;
case DUP2_X1:
i = new Instruction_Dup2_x1();
break;
case DUP2_X2:
i = new Instruction_Dup2_x2();
break;
case SWAP:
i = new Instruction_Swap();
break;
case IADD:
i = new Instruction_Iadd();
break;
case LADD:
i = new Instruction_Ladd();
break;
case FADD:
i = new Instruction_Fadd();
break;
case DADD:
i = new Instruction_Dadd();
break;
case ISUB:
i = new Instruction_Isub();
break;
case LSUB:
i = new Instruction_Lsub();
break;
case FSUB:
i = new Instruction_Fsub();
break;
case DSUB:
i = new Instruction_Dsub();
break;
case IMUL:
i = new Instruction_Imul();
break;
case LMUL:
i = new Instruction_Lmul();
break;
case FMUL:
i = new Instruction_Fmul();
break;
case DMUL:
i = new Instruction_Dmul();
break;
case IDIV:
i = new Instruction_Idiv();
break;
case LDIV:
i = new Instruction_Ldiv();
break;
case FDIV:
i = new Instruction_Fdiv();
break;
case DDIV:
i = new Instruction_Ddiv();
break;
case IREM:
i = new Instruction_Irem();
break;
case LREM:
i = new Instruction_Lrem();
break;
case FREM:
i = new Instruction_Frem();
break;
case DREM:
i = new Instruction_Drem();
break;
case INEG:
i = new Instruction_Ineg();
break;
case LNEG:
i = new Instruction_Lneg();
break;
case FNEG:
i = new Instruction_Fneg();
break;
case DNEG:
i = new Instruction_Dneg();
break;
case ISHL:
i = new Instruction_Ishl();
break;
case ISHR:
i = new Instruction_Ishr();
break;
case IUSHR:
i = new Instruction_Iushr();
break;
case LSHL:
i = new Instruction_Lshl();
break;
case LSHR:
i = new Instruction_Lshr();
break;
case LUSHR:
i = new Instruction_Lushr();
break;
case IAND:
i = new Instruction_Iand();
break;
case LAND:
i = new Instruction_Land();
break;
case IOR:
i = new Instruction_Ior();
break;
case LOR:
i = new Instruction_Lor();
break;
case IXOR:
i = new Instruction_Ixor();
break;
case LXOR:
i = new Instruction_Lxor();
break;
case I2L:
i = new Instruction_I2l();
break;
case I2F:
i = new Instruction_I2f();
break;
case I2D:
i = new Instruction_I2d();
break;
case L2I:
i = new Instruction_L2i();
break;
case L2F:
i = new Instruction_L2f();
break;
case L2D:
i = new Instruction_L2d();
break;
case F2I:
i = new Instruction_F2i();
break;
case F2L:
i = new Instruction_F2l();
break;
case F2D:
i = new Instruction_F2d();
break;
case D2I:
i = new Instruction_D2i();
break;
case D2L:
i = new Instruction_D2l();
break;
case D2F:
i = new Instruction_D2f();
break;
case INT2BYTE:
i = new Instruction_Int2byte();
break;
case INT2CHAR:
i = new Instruction_Int2char();
break;
case INT2SHORT:
i = new Instruction_Int2short();
break;
case IFEQ:
i = new Instruction_Ifeq();
break;
case IFNULL:
i = new Instruction_Ifnull();
break;
case IFLT:
i = new Instruction_Iflt();
break;
case IFLE:
i = new Instruction_Ifle();
break;
case IFNE:
i = new Instruction_Ifne();
break;
case IFNONNULL:
i = new Instruction_Ifnonnull();
break;
case IFGT:
i = new Instruction_Ifgt();
break;
case IFGE:
i = new Instruction_Ifge();
break;
case IF_ICMPEQ:
i = new Instruction_If_icmpeq();
break;
case IF_ICMPLT:
i = new Instruction_If_icmplt();
break;
case IF_ICMPLE:
i = new Instruction_If_icmple();
break;
case IF_ICMPNE:
i = new Instruction_If_icmpne();
break;
case IF_ICMPGT:
i = new Instruction_If_icmpgt();
break;
case IF_ICMPGE:
i = new Instruction_If_icmpge();
break;
case LCMP:
i = new Instruction_Lcmp();
break;
case FCMPL:
i = new Instruction_Fcmpl();
break;
case FCMPG:
i = new Instruction_Fcmpg();
break;
case DCMPL:
i = new Instruction_Dcmpl();
break;
case DCMPG:
i = new Instruction_Dcmpg();
break;
case IF_ACMPEQ:
i = new Instruction_If_acmpeq();
break;
case IF_ACMPNE:
i = new Instruction_If_acmpne();
break;
case GOTO:
i = new Instruction_Goto();
break;
case GOTO_W:
i = new Instruction_Goto_w();
break;
case JSR:
i = new Instruction_Jsr();
break;
case JSR_W:
i = new Instruction_Jsr_w();
break;
case RET:
i = new Instruction_Ret();
break;
case RET_W:
i = new Instruction_Ret_w();
break;
case RETURN:
i = new Instruction_Return();
break;
case IRETURN:
i = new Instruction_Ireturn();
break;
case LRETURN:
i = new Instruction_Lreturn();
break;
case FRETURN:
i = new Instruction_Freturn();
break;
case DRETURN:
i = new Instruction_Dreturn();
break;
case ARETURN:
i = new Instruction_Areturn();
break;
case BREAKPOINT:
i = new Instruction_Breakpoint();
break;
case TABLESWITCH:
i = (Instruction)new Instruction_Tableswitch();
break;
case LOOKUPSWITCH:
i = (Instruction)new Instruction_Lookupswitch();
break;
case PUTFIELD:
i = (Instruction)new Instruction_Putfield();
break;
case GETFIELD:
i = (Instruction)new Instruction_Getfield();
break;
case PUTSTATIC:
i = (Instruction)new Instruction_Putstatic();
break;
case GETSTATIC:
i = (Instruction)new Instruction_Getstatic();
break;
case INVOKEVIRTUAL:
i = (Instruction)new Instruction_Invokevirtual();
break;
case INVOKENONVIRTUAL:
i = (Instruction)new Instruction_Invokenonvirtual();
break;
case INVOKESTATIC:
i = (Instruction)new Instruction_Invokestatic();
break;
case INVOKEINTERFACE:
i = (Instruction)new Instruction_Invokeinterface();
break;
case INVOKEDYNAMIC:
i = (Instruction)new Instruction_Invokedynamic();
break;
case ATHROW:
i = (Instruction)new Instruction_Athrow();
break;
case NEW:
i = (Instruction)new Instruction_New();
break;
case CHECKCAST:
i = (Instruction)new Instruction_Checkcast();
break;
case INSTANCEOF:
i = (Instruction)new Instruction_Instanceof();
break;
case MONITORENTER:
i = (Instruction)new Instruction_Monitorenter();
break;
case MONITOREXIT:
i = (Instruction)new Instruction_Monitorexit();
break;
default:
//int j;
//j = ((int)b)&0xff;
//G.v().out.println("Unknown instruction op=" + j +
// " at offset " + index);
i = (Instruction)new Instruction_Unknown(b);
break;
}
i.label = index;
if(isWide)
i.parse(bc,index+2);
else
i.parse(bc,index+1);
return i;
}
/** Given a list of Instructions, this method converts all offsets
* to pointers.
* @param insts list of instructions; labels must be accurate.
* @see Instruction#offsetToPointer
* @see ClassFile#parseMethod
* @see ClassFile#relabel
*/
public void build(Instruction insts) {
Instruction i;
i = insts;
// find out how many instructions that is
icount = 0;
while (i != null) {
icount++;
i = i.next;
}
// build array of instructions
if (icount>0) {
instructions = new Instruction[icount];
// and put the instructions into the array
// identify targets of branch instructions. Why build an array
// when we already have a list? In order to be able to locate
// an instruction given its numeric label quickly.
int k;
k = 0;
i = insts;
while (i != null) {
instructions[k] = i;
k++;
i = i.next;
}
// now convert all offsets to pointers
i = insts;
while (i!=null) {
i.offsetToPointer(this);
i = i.next;
}
}
}
/** Displays the code (in the form of Instructions) for the given list
* of Instructions.
* @param inst input list of instructions.
* @param constant_pool constant pool of the ClassFile object.
* @see ByteCode#showCode(Instruction, int, cp_info)
*/
public static void showCode(Instruction inst,cp_info constant_pool[]) {
showCode(inst,0,constant_pool);
}
/** Displays the code (in the form of Instructions) for the given list
* of Instructions.
* @param inst input list of instructions.
* @param startinst index of the label of the instruction at which to begin.
* @param constant_pool constant pool of the ClassFile object.
* @see ByteCode#showCode(Instruction, cp_info)
*/
public static void showCode(Instruction inst,int startinst,cp_info constant_pool[]) {
int i;
Instruction j = inst;
String pref;
i = startinst;
while (j!=null) {
if (i>999) pref = "";
else if (i>99) pref = " ";
else if (i>9) pref = " ";
else pref = " ";
G.v().out.print(pref + i + ": ");
G.v().out.println(j.toString(constant_pool));
i = j.nextOffset(i);
j = j.next;
}
}
/** Locates the Instruction in the list with the given label.
* @param index label of desired instruction
* @return Instruction object wiht that label, or null if not found.
*/
// locates the instruction with an index value of the given
public Instruction locateInst(int index) {
return locateInstr(index,0,icount);
}
/** Performs a binary search of the instructions[] array. */
private Instruction locateInstr(int index,int mini,int maxi) {
int mid = (maxi-mini)/2 + mini;
if (mini>maxi) return null;
if (instructions[mid].label==index)
return instructions[mid];
if (instructions[mid].label > index)
return locateInstr(index,mini,mid-1);
return locateInstr(index,mid+1,maxi);
}
}
