include/insns.h

   1 /* insns.h   header file for insns.c
   2  *
   3  * The Netwide Assembler is copyright (C) 1996 Simon Tatham and
   4  * Julian Hall. All rights reserved. The software is
   5  * redistributable under the license given in the file "LICENSE"
   6  * distributed in the NASM archive.
   7  */
   8
   9 #ifndef NASM_INSNS_H
  10 #define NASM_INSNS_H
  11
  12 #include "nasm.h"
  13 #include "tokens.h"
  14 #include "iflag.h"
  15
  16 /* if changed, ITEMPLATE_END should be also changed accordingly */
  17 struct itemplate {
  18     enum opcode     opcode;             /* the token, passed from "parser.c" */
  19     int             operands;           /* number of operands */
  20     opflags_t       opd[MAX_OPERANDS];  /* bit flags for operand types */
  21     decoflags_t     deco[MAX_OPERANDS]; /* bit flags for operand decorators */
  22     const uint8_t   *code;              /* the code it assembles to */
  23     uint32_t        iflag_idx;          /* some flags referenced by index */
  24 };
  25
  26 /* Disassembler table structure */
  27
  28 /*
  29  * If n == -1, then p points to another table of 256
  30  * struct disasm_index, otherwise p points to a list of n
  31  * struct itemplates to consider.
  32  */
  33 struct disasm_index {
  34     const void *p;
  35     int n;
  36 };
  37
  38 /* Tables for the assembler and disassembler, respectively */
  39 extern const struct itemplate * const nasm_instructions[];
  40 extern const struct disasm_index itable[256];
  41 extern const struct disasm_index * const itable_vex[NASM_VEX_CLASSES][32][4];
  42
  43 /* Common table for the byte codes */
  44 extern const uint8_t nasm_bytecodes[];
  45
  46 /*
  47  * this define is used to signify the end of an itemplate
  48  */
  49 #define ITEMPLATE_END {I_none,0,{0,},{0,},NULL,0}
  50
  51 /* Width of Dx and RESx instructions */
  52 int const_func idata_bytes(enum opcode opcode);
  53 int const_func resv_bytes(enum opcode opcode);
  54
  55 /*
  56  * Pseudo-op tests
  57  */
  58 /* DB-type instruction (DB, DW, ...) */
  59 static inline bool opcode_is_db(enum opcode opcode)
  60 {
  61     return idata_bytes(opcode) > 0;
  62 }
  63
  64 /* RESB-type instruction (RESB, RESW, ...) */
  65 static inline bool opcode_is_resb(enum opcode opcode)
  66 {
  67     return resv_bytes(opcode) > 0;
  68 }
  69
  70 #endif /* NASM_INSNS_H */