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details (opcode may not be the first field)

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This commit is contained in:
Roberto Ierusalimschy 2004-08-04 17:18:13 -03:00
parent 31e48f26ed
commit 6bddbbde7a
1 changed files with 8 additions and 6 deletions
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14
lopcodes.h
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@ -1,5 +1,5 @@
/*
** $Id: lopcodes.h,v 1.109 2004/05/31 18:51:50 roberto Exp roberto $
** $Id: lopcodes.h,v 1.110 2004/06/29 18:49:02 roberto Exp roberto $
** Opcodes for Lua virtual machine
** See Copyright Notice in lua.h
*/
@ -41,10 +41,11 @@ enum OpMode {iABC, iABx, iAsBx}; /* basic instruction format */
#define SIZE_OP 6
#define POS_OP 0
#define POS_A (POS_OP + SIZE_OP)
#define POS_C (POS_A + SIZE_A)
#define POS_B (POS_C + SIZE_C)
#define POS_Bx POS_C
#define POS_A SIZE_OP
/*
@ -76,8 +77,9 @@ enum OpMode {iABC, iABx, iAsBx}; /* basic instruction format */
** the following macros help to manipulate instructions
*/
#define GET_OPCODE(i) (cast(OpCode, (i)&MASK1(SIZE_OP,0)))
#define SET_OPCODE(i,o) ((i) = (((i)&MASK0(SIZE_OP,0)) | cast(Instruction, o)))
#define GET_OPCODE(i) (cast(OpCode, ((i)>>POS_OP) & MASK1(SIZE_OP,0)))
#define SET_OPCODE(i,o) ((i) = (((i)&MASK0(SIZE_OP,POS_OP)) | \
((cast(Instruction, o)<<POS_OP)&MASK1(SIZE_OP,POS_OP))))
#define GETARG_A(i) (cast(int, ((i)>>POS_A) & MASK1(SIZE_A,0)))
#define SETARG_A(i,u) ((i) = (((i)&MASK0(SIZE_A,POS_A)) | \
@ -99,12 +101,12 @@ enum OpMode {iABC, iABx, iAsBx}; /* basic instruction format */
#define SETARG_sBx(i,b) SETARG_Bx((i),cast(unsigned int, (b)+MAXARG_sBx))
#define CREATE_ABC(o,a,b,c) (cast(Instruction, o) \
#define CREATE_ABC(o,a,b,c) ((cast(Instruction, o)<<POS_OP) \
| (cast(Instruction, a)<<POS_A) \
| (cast(Instruction, b)<<POS_B) \
| (cast(Instruction, c)<<POS_C))
#define CREATE_ABx(o,a,bc) (cast(Instruction, o) \
#define CREATE_ABx(o,a,bc) ((cast(Instruction, o)<<POS_OP) \
| (cast(Instruction, a)<<POS_A) \
| (cast(Instruction, bc)<<POS_Bx))