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@@ -0,0 +1,40 @@
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+/*
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+ * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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+ * See the copyright notice in the ACK home directory, in the file "Copyright".
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+ */
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+/* Contents of flags used when describing interpreter opcodes */
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+
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+#define RCS_IP "$Header$"
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+
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+#define OPTYPE 07 /* type field in flag */
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+
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+#define OPMINI 0 /* m MINI */
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+#define OPSHORT 1 /* s SHORT */
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+#define OPNO 2 /* - No operand */
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+#define OP8 3 /* 1 1-byte signed operand */
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+#define OP16 4 /* 2 2-byte signed operand */
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+#define OP32 5 /* 4 4-byte signed operand */
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+#define OP64 6 /* 8 8-byte signed operand */
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+#define OP16U 7 /* u 2-byte unsigned operand */
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+
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+#define OPESC 010 /* e escaped opcode */
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+#define OPWORD 020 /* w operand is word multiple */
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+#define OPNZ 040 /* o operand starts at 1 ( or wordsize if w-flag) */
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+
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+#define OPRANGE 0300 /* Range of operands: Positive, negative, both */
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+
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+#define OP_BOTH 0000 /* the default */
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+#define OP_POS 0100 /* p Positive (>=0) operands only */
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+#define OP_NEG 0200 /* n Negative (<0) operands only */
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+
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+struct opform {
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+ char i_opcode ; /* the opcode number */
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+ char i_flag ; /* the flag byte */
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+ char i_low ; /* the interpreter first opcode */
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+ char i_num ; /* the number of shorts/minis (optional) */
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+};
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+
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+/* Escape indicators */
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+
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+#define ESC 254 /* To escape group */
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+#define ESC_L 255 /* To 32 and 64 bit operands */
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