1 /*****************************************************************************/
5 /* 6502 code generator */
9 /* (C) 1998-2001 llrich von Bassewitz */
11 /* D-70597 Stuttgart */
12 /* EMail: uz@musoftware.de */
15 /* This software is provided 'as-is', without any expressed or implied */
16 /* warranty. In no event will the authors be held liable for any damages */
17 /* arising from the use of this software. */
19 /* Permission is granted to anyone to use this software for any purpose, */
20 /* including commercial applications, and to alter it and redistribute it */
21 /* freely, subject to the following restrictions: */
23 /* 1. The origin of this software must not be misrepresented; you must not */
24 /* claim that you wrote the original software. If you use this software */
25 /* in a product, an acknowledgment in the product documentation would be */
26 /* appreciated but is not required. */
27 /* 2. Altered source versions must be plainly marked as such, and must not */
28 /* be misrepresented as being the original software. */
29 /* 3. This notice may not be removed or altered from any source */
32 /*****************************************************************************/
47 /*****************************************************************************/
49 /*****************************************************************************/
53 /* Code generator flags.
54 * Note: The type flags are designed so that a smaller type may override a
55 * larger one by or'ing it into the existing one.
57 #define CF_NONE 0x0000 /* No special flags */
59 #define CF_TYPE 0x0007 /* Mask for operand type */
60 #define CF_CHAR 0x0003 /* Operation on characters */
61 #define CF_INT 0x0001 /* Operation on ints */
62 #define CF_PTR CF_INT /* Alias for readability */
63 #define CF_LONG 0x0000 /* Operation on longs */
65 #define CF_NOKEEP 0x0008 /* Value may get destroyed when storing */
67 #define CF_UNSIGNED 0x0010 /* Value is unsigned */
68 #define CF_CONST 0x0020 /* Constant value available */
69 #define CF_CONSTADDR 0x0040 /* Constant address value available */
70 #define CF_TEST 0x0080 /* Test value */
71 #define CF_FIXARGC 0x0100 /* Function has fixed arg count */
72 #define CF_FORCECHAR 0x0200 /* Handle chars as chars, not ints */
73 #define CF_SHORT 0x0400 /* Use short addressing */
74 #define CF_REG 0x0800 /* Value is in primary register */
76 /* Type of static address */
77 #define CF_ADDRMASK 0xF000 /* Type of address */
78 #define CF_STATIC 0x0000 /* Static local */
79 #define CF_EXTERNAL 0x1000 /* Static external */
80 #define CF_ABSOLUTE 0x2000 /* Numeric absolute address */
81 #define CF_LOCAL 0x4000 /* Auto variable */
82 #define CF_REGVAR 0x8000 /* Register variable */
86 /* Compiler relative stackpointer */
95 /*****************************************************************************/
96 /* Pre- and postamble */
97 /*****************************************************************************/
101 void g_preamble (void);
102 /* Generate the assembler code preamble */
106 /*****************************************************************************/
107 /* Segment support */
108 /*****************************************************************************/
112 void g_usecode (void);
113 /* Switch to the code segment */
115 void g_userodata (void);
116 /* Switch to the read only data segment */
118 void g_usedata (void);
119 /* Switch to the data segment */
121 void g_usebss (void);
122 /* Switch to the bss segment */
124 void g_codename (const char* Name);
125 /* Set the name of the CODE segment */
127 void g_rodataname (const char* Name);
128 /* Set the name of the RODATA segment */
130 void g_dataname (const char* Name);
131 /* Set the name of the DATA segment */
133 void g_bssname (const char* Name);
134 /* Set the name of the BSS segment */
138 /*****************************************************************************/
139 /* Functions handling local labels */
140 /*****************************************************************************/
144 void g_defloclabel (unsigned label);
145 /* Define a local label */
149 /*****************************************************************************/
150 /* Functions handling global labels */
151 /*****************************************************************************/
155 void g_defgloblabel (const char* Name);
156 /* Define a global label with the given name */
158 void g_defexport (const char* Name, int ZP);
159 /* Export the given label */
161 void g_defimport (const char* Name, int ZP);
162 /* Import the given label */
166 /*****************************************************************************/
168 /*****************************************************************************/
172 int pop (unsigned flags);
173 /* Pop an argument of the given size */
175 int push (unsigned flags);
176 /* Push an argument of the given size */
178 unsigned sizeofarg (unsigned flags);
179 /* Return the size of a function argument type that is encoded in flags */
183 /*****************************************************************************/
184 /* type conversion and similiar stuff */
185 /*****************************************************************************/
189 void g_toslong (unsigned flags);
190 /* Make sure, the value on TOS is a long. Convert if necessary */
192 void g_tosint (unsigned flags);
193 /* Make sure, the value on TOS is an int. Convert if necessary */
195 void g_reglong (unsigned flags);
196 /* Make sure, the value in the primary register a long. Convert if necessary */
198 unsigned g_typeadjust (unsigned lhs, unsigned rhs);
199 /* Adjust the integer operands before doing a binary operation. lhs is a flags
200 * value, that corresponds to the value on TOS, rhs corresponds to the value
201 * in (e)ax. The return value is the the flags value for the resulting type.
204 unsigned g_typecast (unsigned lhs, unsigned rhs);
205 /* Cast the value in the primary register to the operand size that is flagged
206 * by the lhs value. Return the result value.
209 void g_scale (unsigned flags, long val);
210 /* Scale the value in the primary register by the given value. If val is positive,
211 * scale up, is val is negative, scale down. This function is used to scale
212 * the operands or results of pointer arithmetic by the size of the type, the
218 /*****************************************************************************/
219 /* Function entry and exit */
220 /*****************************************************************************/
224 void g_enter (unsigned flags, unsigned argsize);
225 /* Function prologue */
227 void g_leave (int flags, int val);
228 /* Function epilogue */
232 /*****************************************************************************/
233 /* Register variables */
234 /*****************************************************************************/
238 void g_save_regvars (int RegOffs, unsigned Bytes);
239 /* Save register variables */
241 void g_restore_regvars (int StackOffs, int RegOffs, unsigned Bytes);
242 /* Restore register variables */
246 /*****************************************************************************/
247 /* Fetching memory cells */
248 /*****************************************************************************/
252 void g_getimmed (unsigned Flags, unsigned long Val, unsigned Offs);
253 /* Load a constant into the primary register */
255 void g_getstatic (unsigned Flags, unsigned long Label, unsigned Offs);
256 /* Fetch an static memory cell into the primary register */
258 void g_getlocal (unsigned Flags, int Offs);
259 /* Fetch specified local object (local var). */
261 void g_getind (unsigned Flags, unsigned Offs);
262 /* Fetch the specified object type indirect through the primary register
263 * into the primary register
266 void g_leasp (int Offs);
267 /* Fetch the address of the specified symbol into the primary register */
269 void g_leavariadic (int Offs);
270 /* Fetch the address of a parameter in a variadic function into the primary
276 /*****************************************************************************/
277 /* Store into memory */
278 /*****************************************************************************/
282 void g_putstatic (unsigned flags, unsigned long label, unsigned offs);
283 /* Store the primary register into the specified static memory cell */
285 void g_putlocal (unsigned Flags, int Offs, long Val);
286 /* Put data into local object. */
288 void g_putind (unsigned flags, unsigned offs);
289 /* Store the specified object type in the primary register at the address
290 * on the top of the stack
295 /*****************************************************************************/
296 /* Adds and subs of variables fix a fixed address */
297 /*****************************************************************************/
301 void g_addlocal (unsigned flags, int offs);
302 /* Add a local variable to ax */
304 void g_addstatic (unsigned flags, unsigned long label, unsigned offs);
305 /* Add a static variable to ax */
309 /*****************************************************************************/
310 /* Compares of ax with a variable with fixed address */
311 /*****************************************************************************/
315 void g_cmplocal (unsigned flags, int offs);
316 /* Compare a local variable to ax */
318 void g_cmpstatic (unsigned flags, unsigned label, unsigned offs);
319 /* Compare a static variable to ax */
323 /*****************************************************************************/
324 /* Special op= functions */
325 /*****************************************************************************/
329 void g_addeqstatic (unsigned flags, unsigned long label, unsigned offs,
331 /* Emit += for a static variable */
333 void g_addeqlocal (unsigned flags, int offs, unsigned long val);
334 /* Emit += for a local variable */
336 void g_addeqind (unsigned flags, unsigned offs, unsigned long val);
337 /* Emit += for the location with address in ax */
339 void g_subeqstatic (unsigned flags, unsigned long label, unsigned offs,
341 /* Emit -= for a static variable */
343 void g_subeqlocal (unsigned flags, int offs, unsigned long val);
344 /* Emit -= for a local variable */
346 void g_subeqind (unsigned flags, unsigned offs, unsigned long val);
347 /* Emit -= for the location with address in ax */
351 /*****************************************************************************/
352 /* Add a variable address to the value in ax */
353 /*****************************************************************************/
357 void g_addaddr_local (unsigned flags, int offs);
358 /* Add the address of a local variable to ax */
360 void g_addaddr_static (unsigned flags, unsigned long label, unsigned offs);
361 /* Add the address of a static variable to ax */
365 /*****************************************************************************/
367 /*****************************************************************************/
371 void g_save (unsigned flags);
372 void g_restore (unsigned flags);
374 void g_cmp (unsigned flags, unsigned long val);
375 /* Immidiate compare. The primary register will not be changed, Z flag
379 void g_test (unsigned flags);
380 void g_push (unsigned flags, unsigned long val);
381 void g_swap (unsigned flags);
383 void g_call (unsigned Flags, const char* Label, unsigned ArgSize);
384 /* Call the specified subroutine name */
386 void g_callind (unsigned Flags, unsigned ArgSize);
387 /* Call subroutine with address in AX */
389 void g_jump (unsigned Label);
390 /* Jump to specified internal label number */
392 void g_switch (unsigned Flags);
393 /* Output switch statement preamble */
395 void g_case (unsigned flags, unsigned label, unsigned long val);
396 /* Create table code for one case selector */
398 void g_truejump (unsigned flags, unsigned label);
399 /* Jump to label if zero flag clear */
401 void g_falsejump (unsigned flags, unsigned label);
402 /* Jump to label if zero flag set */
404 void g_space (int space);
405 /* Create or drop space on the stack */
407 void g_cstackcheck (void);
408 /* Check for a C stack overflow */
410 void g_stackcheck (void);
411 /* Check for a stack overflow */
413 void g_add (unsigned flags, unsigned long val);
414 void g_sub (unsigned flags, unsigned long val);
415 void g_rsub (unsigned flags, unsigned long val);
416 void g_mul (unsigned flags, unsigned long val);
417 void g_div (unsigned flags, unsigned long val);
418 void g_mod (unsigned flags, unsigned long val);
419 void g_or (unsigned flags, unsigned long val);
420 void g_xor (unsigned flags, unsigned long val);
421 void g_and (unsigned flags, unsigned long val);
422 void g_asr (unsigned flags, unsigned long val);
423 void g_asl (unsigned flags, unsigned long val);
424 void g_neg (unsigned flags);
425 void g_bneg (unsigned flags);
426 void g_com (unsigned flags);
427 void g_inc (unsigned flags, unsigned long n);
428 void g_dec (unsigned flags, unsigned long n);
429 void g_eq (unsigned flags, unsigned long val);
430 void g_ne (unsigned flags, unsigned long val);
431 void g_lt (unsigned flags, unsigned long val);
432 void g_le (unsigned flags, unsigned long val);
433 void g_gt (unsigned flags, unsigned long val);
434 void g_ge (unsigned flags, unsigned long val);
436 void g_res (unsigned n);
437 /* Reserve static storage, n bytes */
439 void g_defdata (unsigned flags, unsigned long val, unsigned offs);
440 /* Define data with the size given in flags */
442 void g_defbytes (const void* bytes, unsigned count);
443 /* Output a row of bytes as a constant */
445 void g_zerobytes (unsigned n);
446 /* Output n bytes of data initialized with zero */
450 /*****************************************************************************/
451 /* User supplied assembler code */
452 /*****************************************************************************/
456 void g_asmcode (const char* Line, int Len);
457 /* Output one line of assembler code. If Len is greater than zero, it is used
458 * as the maximum number of characters to use from Line.
463 /*****************************************************************************/
464 /* Inlined known functions */
465 /*****************************************************************************/
469 void g_strlen (unsigned flags, unsigned long val, unsigned offs);
470 /* Inline the strlen() function */
474 /* End of codegen.h */