code.java

这是实现Javac功能的GJC的最新源码

      */
    public void endScopes(int first) {
        if (varDebugInfo)
            for (int i = first; i < nextreg; i++)
                endScope(i);
        nextreg = first;
    }

    /**
      * How opcodes affect the stack size.
      *  Opcodes with stackdiff value -999 need to be teated specially.
      *  Opcodes with stackdiff value < -1000 are jumps after which code is dead.
      */
    public static final int[] stackdiff = new int[ByteCodeCount];
    static {
        stackdiff[nop] = 0;
        stackdiff[aconst_null] = 1;
        stackdiff[iconst_m1] = 1;
        stackdiff[iconst_0] = 1;
        stackdiff[iconst_1] = 1;
        stackdiff[iconst_2] = 1;
        stackdiff[iconst_3] = 1;
        stackdiff[iconst_4] = 1;
        stackdiff[iconst_5] = 1;
        stackdiff[lconst_0] = 2;
        stackdiff[lconst_1] = 2;
        stackdiff[fconst_0] = 1;
        stackdiff[fconst_1] = 1;
        stackdiff[fconst_2] = 1;
        stackdiff[dconst_0] = 2;
        stackdiff[dconst_1] = 2;
        stackdiff[bipush] = 1;
        stackdiff[sipush] = 1;
        stackdiff[ldc1] = -999;
        stackdiff[ldc2] = -999;
        stackdiff[ldc2w] = -999;
        stackdiff[iload] = 1;
        stackdiff[lload] = 2;
        stackdiff[fload] = 1;
        stackdiff[dload] = 2;
        stackdiff[aload] = 1;
        stackdiff[iload_0] = 1;
        stackdiff[lload_0] = 2;
        stackdiff[fload_0] = 1;
        stackdiff[dload_0] = 2;
        stackdiff[aload_0] = 1;
        stackdiff[iload_1] = 1;
        stackdiff[lload_1] = 2;
        stackdiff[fload_1] = 1;
        stackdiff[dload_1] = 2;
        stackdiff[aload_1] = 1;
        stackdiff[iload_2] = 1;
        stackdiff[lload_2] = 2;
        stackdiff[fload_2] = 1;
        stackdiff[dload_2] = 2;
        stackdiff[aload_2] = 1;
        stackdiff[iload_3] = 1;
        stackdiff[lload_3] = 2;
        stackdiff[fload_3] = 1;
        stackdiff[dload_3] = 2;
        stackdiff[aload_3] = 1;
        stackdiff[iaload] = -1;
        stackdiff[laload] = 0;
        stackdiff[faload] = -1;
        stackdiff[daload] = 0;
        stackdiff[aaload] = -1;
        stackdiff[baload] = -1;
        stackdiff[caload] = -1;
        stackdiff[saload] = -1;
        stackdiff[istore] = -1;
        stackdiff[lstore] = -2;
        stackdiff[fstore] = -1;
        stackdiff[dstore] = -2;
        stackdiff[astore] = -1;
        stackdiff[istore_0] = -1;
        stackdiff[lstore_0] = -2;
        stackdiff[fstore_0] = -1;
        stackdiff[dstore_0] = -2;
        stackdiff[astore_0] = -1;
        stackdiff[istore_1] = -1;
        stackdiff[lstore_1] = -2;
        stackdiff[fstore_1] = -1;
        stackdiff[dstore_1] = -2;
        stackdiff[astore_1] = -1;
        stackdiff[istore_2] = -1;
        stackdiff[lstore_2] = -2;
        stackdiff[fstore_2] = -1;
        stackdiff[dstore_2] = -2;
        stackdiff[astore_2] = -1;
        stackdiff[istore_3] = -1;
        stackdiff[lstore_3] = -2;
        stackdiff[fstore_3] = -1;
        stackdiff[dstore_3] = -2;
        stackdiff[astore_3] = -1;
        stackdiff[iastore] = -3;
        stackdiff[lastore] = -4;
        stackdiff[fastore] = -3;
        stackdiff[dastore] = -4;
        stackdiff[aastore] = -3;
        stackdiff[bastore] = -3;
        stackdiff[castore] = -3;
        stackdiff[sastore] = -3;
        stackdiff[pop] = -1;
        stackdiff[pop2] = -2;
        stackdiff[dup] = 1;
        stackdiff[dup_x1] = 1;
        stackdiff[dup_x2] = 1;
        stackdiff[dup2] = 2;
        stackdiff[dup2_x1] = 2;
        stackdiff[dup2_x2] = 2;
        stackdiff[swap] = 0;
        stackdiff[iadd] = -1;
        stackdiff[ladd] = -2;
        stackdiff[fadd] = -1;
        stackdiff[dadd] = -2;
        stackdiff[isub] = -1;
        stackdiff[lsub] = -2;
        stackdiff[fsub] = -1;
        stackdiff[dsub] = -2;
        stackdiff[imul] = -1;
        stackdiff[lmul] = -2;
        stackdiff[fmul] = -1;
        stackdiff[dmul] = -2;
        stackdiff[idiv] = -1;
        stackdiff[ldiv] = -2;
        stackdiff[fdiv] = -1;
        stackdiff[ddiv] = -2;
        stackdiff[imod] = -1;
        stackdiff[lmod] = -2;
        stackdiff[fmod] = -1;
        stackdiff[dmod] = -2;
        stackdiff[ineg] = 0;
        stackdiff[lneg] = 0;
        stackdiff[fneg] = 0;
        stackdiff[dneg] = 0;
        stackdiff[ishl] = -1;
        stackdiff[lshl] = -1;
        stackdiff[ishr] = -1;
        stackdiff[lshr] = -1;
        stackdiff[iushr] = -1;
        stackdiff[lushr] = -1;
        stackdiff[iand] = -1;
        stackdiff[land] = -2;
        stackdiff[ior] = -1;
        stackdiff[lor] = -2;
        stackdiff[ixor] = -1;
        stackdiff[lxor] = -2;
        stackdiff[iinc] = 0;
        stackdiff[i2l] = 1;
        stackdiff[i2f] = 0;
        stackdiff[i2d] = 1;
        stackdiff[l2i] = -1;
        stackdiff[l2f] = -1;
        stackdiff[l2d] = 0;
        stackdiff[f2i] = 0;
        stackdiff[f2l] = 1;
        stackdiff[f2d] = 1;
        stackdiff[d2i] = -1;
        stackdiff[d2l] = 0;
        stackdiff[d2f] = -1;
        stackdiff[int2byte] = 0;
        stackdiff[int2char] = 0;
        stackdiff[int2short] = 0;
        stackdiff[lcmp] = -3;
        stackdiff[fcmpl] = -1;
        stackdiff[fcmpg] = -1;
        stackdiff[dcmpl] = -3;
        stackdiff[dcmpg] = -3;
        stackdiff[ifeq] = -1;
        stackdiff[ifne] = -1;
        stackdiff[iflt] = -1;
        stackdiff[ifge] = -1;
        stackdiff[ifgt] = -1;
        stackdiff[ifle] = -1;
        stackdiff[if_icmpeq] = -2;
        stackdiff[if_icmpne] = -2;
        stackdiff[if_icmplt] = -2;
        stackdiff[if_icmpge] = -2;
        stackdiff[if_icmpgt] = -2;
        stackdiff[if_icmple] = -2;
        stackdiff[if_acmpeq] = -2;
        stackdiff[if_acmpne] = -2;
        stackdiff[goto_] = 0;
        stackdiff[jsr] = 0;
        stackdiff[ret] = 0;
        stackdiff[tableswitch] = -1;
        stackdiff[lookupswitch] = -1;
        stackdiff[ireturn] = -1001;
        stackdiff[lreturn] = -1002;
        stackdiff[freturn] = -1001;
        stackdiff[dreturn] = -1002;
        stackdiff[areturn] = -1001;
        stackdiff[return_] = -1000;
        stackdiff[getstatic] = -999;
        stackdiff[putstatic] = -999;
        stackdiff[getfield] = -999;
        stackdiff[putfield] = -999;
        stackdiff[invokevirtual] = -999;
        stackdiff[invokespecial] = -999;
        stackdiff[invokestatic] = -999;
        stackdiff[invokeinterface] = -999;
        stackdiff[newfromname] = 0;
        stackdiff[new_] = 1;
        stackdiff[newarray] = 0;
        stackdiff[anewarray] = 0;
        stackdiff[arraylength] = 0;
        stackdiff[athrow] = -1001;
        stackdiff[checkcast] = 0;
        stackdiff[instanceof_] = 0;
        stackdiff[monitorenter] = -1;
        stackdiff[monitorexit] = -1;
        stackdiff[wide] = 0;
        stackdiff[multianewarray] = -999;
        stackdiff[if_acmp_null] = -1;
        stackdiff[if_acmp_nonnull] = -1;
        stackdiff[goto_w] = 0;
        stackdiff[jsr_w] = 0;
        stackdiff[breakpoint] = 0;
    }

    public static String mnem(int opcode) {
        return Mneumonics.mnem[opcode];
    }

    private static class Mneumonics {

        private Mneumonics() {
            super();
        }
        private static final String[] mnem = new String[ByteCodeCount];
        static {
            mnem[nop] = "nop";
            mnem[aconst_null] = "aconst_null";
            mnem[iconst_m1] = "iconst_m1";
            mnem[iconst_0] = "iconst_0";
            mnem[iconst_1] = "iconst_1";
            mnem[iconst_2] = "iconst_2";
            mnem[iconst_3] = "iconst_3";
            mnem[iconst_4] = "iconst_4";
            mnem[iconst_5] = "iconst_5";
            mnem[lconst_0] = "lconst_0";
            mnem[lconst_1] = "lconst_1";
            mnem[fconst_0] = "fconst_0";
            mnem[fconst_1] = "fconst_1";
            mnem[fconst_2] = "fconst_2";
            mnem[dconst_0] = "dconst_0";
            mnem[dconst_1] = "dconst_1";
            mnem[bipush] = "bipush";
            mnem[sipush] = "sipush";
            mnem[ldc1] = "ldc1";
            mnem[ldc2] = "ldc2";
            mnem[ldc2w] = "ldc2w";
            mnem[iload] = "iload";
            mnem[lload] = "lload";
            mnem[fload] = "fload";
            mnem[dload] = "dload";
            mnem[aload] = "aload";
            mnem[iload_0] = "iload_0";
            mnem[lload_0] = "lload_0";
            mnem[fload_0] = "fload_0";
            mnem[dload_0] = "dload_0";
            mnem[aload_0] = "aload_0";
            mnem[iload_1] = "iload_1";
            mnem[lload_1] = "lload_1";
            mnem[fload_1] = "fload_1";
            mnem[dload_1] = "dload_1";
            mnem[aload_1] = "aload_1";
            mnem[iload_2] = "iload_2";
            mnem[lload_2] = "lload_2";
            mnem[fload_2] = "fload_2";
            mnem[dload_2] = "dload_2";
            mnem[aload_2] = "aload_2";
            mnem[iload_3] = "iload_3";
            mnem[lload_3] = "lload_3";
            mnem[fload_3] = "fload_3";
            mnem[dload_3] = "dload_3";
            mnem[aload_3] = "aload_3";
            mnem[iaload] = "iaload";
            mnem[laload] = "laload";
            mnem[faload] = "faload";
            mnem[daload] = "daload";
            mnem[aaload] = "aaload";
            mnem[baload] = "baload";
            mnem[caload] = "caload";
            mnem[saload] = "saload";
            mnem[istore] = "istore";
            mnem[lstore] = "lstore";
            mnem[fstore] = "fstore";
            mnem[dstore] = "dstore";
            mnem[astore] = "astore";
            mnem[istore_0] = "istore_0";
            mnem[lstore_0] = "lstore_0";
            mnem[fstore_0] = "fstore_0";
            mnem[dstore_0] = "dstore_0";
            mnem[astore_0] = "astore_0";
            mnem[istore_1] = "istore_1";
            mnem[lstore_1] = "lstore_1";
            mnem[fstore_1] = "fstore_1";
            mnem[dstore_1] = "dstore_1";
            mnem[astore_1] = "astore_1";
            mnem[istore_2] = "istore_2";
            mnem[lstore_2] = "lstore_2";
            mnem[fstore_2] = "fstore_2";
            mnem[dstore_2] = "dstore_2";
            mnem[astore_2] = "astore_2";
            mnem[istore_3] = "istore_3";
            mnem[lstore_3] = "lstore_3";
            mnem[fstore_3] = "fstore_3";
            mnem[dstore_3] = "dstore_3";
            mnem[astore_3] = "astore_3";
            mnem[iastore] = "iastore";
            mnem[lastore] = "lastore";
            mnem[fastore] = "fastore";
            mnem[dastore] = "dastore";
            mnem[aastore] = "aastore";
            mnem[bastore] = "bastore";
            mnem[castore] = "castore";
            mnem[sastore] = "sastore";
            mnem[pop] = "pop";
            mnem[pop2] = "pop2";
            mnem[dup] = "dup";
            mnem[dup_x1] = "dup_x1";
            mnem[dup_x2] = "dup_x2";
            mnem[dup2] = "dup2";
            mnem[dup2_x1] = "dup2_x1";
            mnem[dup2_x2] = "dup2_x2";
            mnem[swap] = "swap";
            mnem[iadd] = "iadd";
            mnem[ladd] = "ladd";
            mnem[fadd] = "fadd";
            mnem[dadd] = "dadd";
            mnem[isub] = "isub";
            mnem[lsub] = "lsub";
            mnem[fsub] = "fsub";
            mnem[dsub] = "dsub";
            mnem[imul] = "imul";
            mnem[lmul] = "lmul";
            mnem[fmul] = "fmul";
            mnem[dmul] = "dmul";
            mnem[idiv] = "idiv";
            mnem[ldiv] = "ldiv";
            mnem[fdiv] = "fdiv";
            mnem[ddiv] = "ddiv";
            mnem[imod] = "imod";
            mnem[lmod] = "lmod";
            mnem[fmod] = "fmod";
            mnem[dmod] = "dmod";
            mnem[ineg] = "ineg";
            mnem[lneg] = "lneg";
            mnem[fneg] = "fneg";
            mnem[dneg] = "dneg";
            mnem[ishl] = "ishl";
            mnem[lshl] = "lshl";
            mnem[ishr] = "ishr";
            mnem[lshr] = "lshr";
            mnem[iushr] = "iushr";
            mnem[lushr] = "lushr";
            mnem[iand] = "iand";
            mnem[land] = "land";
            mnem[ior] = "ior";
            mnem[lor] = "lor";
            mnem[ixor] = "ixor";
            mnem[lxor] = "lxor";
            mnem[iinc] = "iinc";
            mnem[i2l] = "i2l";
            mnem[i2f] = "i2f";
            mnem[i2d] = "i2d";
            mnem[l2i] = "l2i";
            mnem[l2f] = "l2f";
            mnem[l2d] = "l2d";
            mnem[f2i] = "f2i";
            mnem[f2l] = "f2l";
            mnem[f2d] = "f2d";
            mnem[d2i] = "d2i";
            mnem[d2l] = "d2l";
            mnem[d2f] = "d2f";
            mnem[int2byte] = "int2byte";
            mnem[int2char] = "int2char";
            mnem[int2short] = "int2short";
            mnem[lcmp] = "lcmp";
            mnem[fcmpl] = "fcmpl";
            mnem[fcmpg] = "fcmpg";
            mnem[dcmpl] = "dcmpl";
            mnem[dcmpg] = "dcmpg";
            mnem[ifeq] = "ifeq";
            mnem[ifne] = "ifne";
            mnem[iflt] = "iflt";
            mnem[ifge] = "ifge";
            mnem[ifgt] = "ifgt";
            mnem[ifle] = "ifle";
            mnem[if_icmpeq] = "if_icmpeq";
            mnem[if_icmpne] = "if_icmpne";
            mnem[if_icmplt] = "if_icmplt";
            mnem[if_icmpge] = "if_icmpge";
            mnem[if_icmpgt] = "if_icmpgt";
            mnem[if_icmple] = "if_icmple";
            mnem[if_acmpeq] = "if_acmpeq";
            mnem[if_acmpne] = "if_acmpne";
            mnem[goto_] = "goto_";
            mnem[jsr] = "jsr";
            mnem[ret] = "ret";
            mnem[tableswitch] = "tableswitch";
            mnem[lookupswitch] = "lookupswitch";
            mnem[ireturn] = "ireturn";
            mnem[lreturn] = "lreturn";
            mnem[freturn] = "freturn";
            mnem[dreturn] = "dreturn";
            mnem[areturn] = "areturn";
            mnem[return_] = "return_";
            mnem[getstatic] = "getstatic";
            mnem[putstatic] = "putstatic";
            mnem[getfield] = "getfield";
            mnem[putfield] = "putfield";
            mnem[invokevirtual] = "invokevirtual";
            mnem[invokespecial] = "invokespecial";
            mnem[invokestatic] = "invokestatic";
            mnem[invokeinterface] = "invokeinterface";
            mnem[newfromname] = "newfromname";
            mnem[new_] = "new_";
            mnem[newarray] = "newarray";
            mnem[anewarray] = "anewarray";
            mnem[arraylength] = "arraylength";
            mnem[athrow] = "athrow";
            mnem[checkcast] = "checkcast";
            mnem[instanceof_] = "instanceof_";
            mnem[monitorenter] = "monitorenter";
            mnem[monitorexit] = "monitorexit";
            mnem[wide] = "wide";
            mnem[multianewarray] = "multianewarray";
            mnem[if_acmp_null] = "if_acmp_null";
            mnem[if_acmp_nonnull] = "if_acmp_nonnull";
            mnem[goto_w] = "goto_w";
            mnem[jsr_w] = "jsr_w";
            mnem[breakpoint] = "breakpoint";
        }
    }
}