1 /*****************************************************************************/
5 /* 6502 code generator */
9 /* (C) 1998-2001 llrich von Bassewitz */
11 /* D-70597 Stuttgart */
12 /* EMail: uz@cc65.org */
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 /*****************************************************************************/
46 /*****************************************************************************/
48 /*****************************************************************************/
52 /* Code generator flags.
53 * Note: The type flags are designed so that a smaller type may override a
54 * larger one by or'ing it into the existing one.
56 #define CF_NONE 0x0000 /* No special flags */
58 #define CF_TYPE 0x0007 /* Mask for operand type */
59 #define CF_CHAR 0x0003 /* Operation on characters */
60 #define CF_INT 0x0001 /* Operation on ints */
61 #define CF_PTR CF_INT /* Alias for readability */
62 #define CF_LONG 0x0000 /* Operation on longs */
64 #define CF_NOKEEP 0x0008 /* Value may get destroyed when storing */
66 #define CF_UNSIGNED 0x0010 /* Value is unsigned */
67 #define CF_CONST 0x0020 /* Constant value available */
68 #define CF_CONSTADDR 0x0040 /* Constant address value available */
69 #define CF_TEST 0x0080 /* Test value */
70 #define CF_FIXARGC 0x0100 /* Function has fixed arg count */
71 #define CF_FORCECHAR 0x0200 /* Handle chars as chars, not ints */
72 #define CF_REG 0x0800 /* Value is in primary register */
74 /* Type of static address */
75 #define CF_ADDRMASK 0xF000 /* Type of address */
76 #define CF_STATIC 0x0000 /* Static local */
77 #define CF_EXTERNAL 0x1000 /* Static external */
78 #define CF_ABSOLUTE 0x2000 /* Numeric absolute address */
79 #define CF_LOCAL 0x4000 /* Auto variable */
80 #define CF_REGVAR 0x8000 /* Register variable */
84 /* Compiler relative stackpointer */
89 /*****************************************************************************/
90 /* Pre- and postamble */
91 /*****************************************************************************/
95 void g_preamble (void);
96 /* Generate the assembler code preamble */
100 /*****************************************************************************/
101 /* Segment support */
102 /*****************************************************************************/
106 void g_userodata (void);
107 /* Switch to the read only data segment */
109 void g_usedata (void);
110 /* Switch to the data segment */
112 void g_usebss (void);
113 /* Switch to the bss segment */
115 void g_segname (segment_t Seg, const char* Name);
116 /* Set the name of a segment */
120 /*****************************************************************************/
121 /* Functions handling local labels */
122 /*****************************************************************************/
126 void g_defcodelabel (unsigned label);
127 /* Define a local code label */
129 void g_defdatalabel (unsigned label);
130 /* Define a local data label */
134 /*****************************************************************************/
135 /* Functions handling global labels */
136 /*****************************************************************************/
140 void g_defgloblabel (const char* Name);
141 /* Define a global label with the given name */
143 void g_defexport (const char* Name, int ZP);
144 /* Export the given label */
146 void g_defimport (const char* Name, int ZP);
147 /* Import the given label */
151 /*****************************************************************************/
153 /*****************************************************************************/
157 int pop (unsigned flags);
158 /* Pop an argument of the given size */
160 int push (unsigned flags);
161 /* Push an argument of the given size */
163 unsigned sizeofarg (unsigned flags);
164 /* Return the size of a function argument type that is encoded in flags */
168 /*****************************************************************************/
169 /* type conversion and similiar stuff */
170 /*****************************************************************************/
174 void g_toslong (unsigned flags);
175 /* Make sure, the value on TOS is a long. Convert if necessary */
177 void g_tosint (unsigned flags);
178 /* Make sure, the value on TOS is an int. Convert if necessary */
180 void g_reglong (unsigned flags);
181 /* Make sure, the value in the primary register a long. Convert if necessary */
183 unsigned g_typeadjust (unsigned lhs, unsigned rhs);
184 /* Adjust the integer operands before doing a binary operation. lhs is a flags
185 * value, that corresponds to the value on TOS, rhs corresponds to the value
186 * in (e)ax. The return value is the the flags value for the resulting type.
189 unsigned g_typecast (unsigned lhs, unsigned rhs);
190 /* Cast the value in the primary register to the operand size that is flagged
191 * by the lhs value. Return the result value.
194 void g_scale (unsigned flags, long val);
195 /* Scale the value in the primary register by the given value. If val is positive,
196 * scale up, is val is negative, scale down. This function is used to scale
197 * the operands or results of pointer arithmetic by the size of the type, the
203 /*****************************************************************************/
204 /* Function entry and exit */
205 /*****************************************************************************/
209 void g_enter (unsigned flags, unsigned argsize);
210 /* Function prologue */
213 /* Function epilogue */
217 /*****************************************************************************/
218 /* Register variables */
219 /*****************************************************************************/
223 void g_save_regvars (int RegOffs, unsigned Bytes);
224 /* Save register variables */
226 void g_restore_regvars (int StackOffs, int RegOffs, unsigned Bytes);
227 /* Restore register variables */
231 /*****************************************************************************/
232 /* Fetching memory cells */
233 /*****************************************************************************/
237 void g_getimmed (unsigned Flags, unsigned long Val, unsigned Offs);
238 /* Load a constant into the primary register */
240 void g_getstatic (unsigned Flags, unsigned long Label, unsigned Offs);
241 /* Fetch an static memory cell into the primary register */
243 void g_getlocal (unsigned Flags, int Offs);
244 /* Fetch specified local object (local var). */
246 void g_getind (unsigned Flags, unsigned Offs);
247 /* Fetch the specified object type indirect through the primary register
248 * into the primary register
251 void g_leasp (int Offs);
252 /* Fetch the address of the specified symbol into the primary register */
254 void g_leavariadic (int Offs);
255 /* Fetch the address of a parameter in a variadic function into the primary
261 /*****************************************************************************/
262 /* Store into memory */
263 /*****************************************************************************/
267 void g_putstatic (unsigned flags, unsigned long label, unsigned offs);
268 /* Store the primary register into the specified static memory cell */
270 void g_putlocal (unsigned Flags, int Offs, long Val);
271 /* Put data into local object. */
273 void g_putind (unsigned flags, unsigned offs);
274 /* Store the specified object type in the primary register at the address
275 * on the top of the stack
280 /*****************************************************************************/
281 /* Adds and subs of variables fix a fixed address */
282 /*****************************************************************************/
286 void g_addlocal (unsigned flags, int offs);
287 /* Add a local variable to ax */
289 void g_addstatic (unsigned flags, unsigned long label, unsigned offs);
290 /* Add a static variable to ax */
294 /*****************************************************************************/
295 /* Compares of ax with a variable with fixed address */
296 /*****************************************************************************/
300 void g_cmplocal (unsigned flags, int offs);
301 /* Compare a local variable to ax */
303 void g_cmpstatic (unsigned flags, unsigned label, unsigned offs);
304 /* Compare a static variable to ax */
308 /*****************************************************************************/
309 /* Special op= functions */
310 /*****************************************************************************/
314 void g_addeqstatic (unsigned flags, unsigned long label, unsigned offs,
316 /* Emit += for a static variable */
318 void g_addeqlocal (unsigned flags, int offs, unsigned long val);
319 /* Emit += for a local variable */
321 void g_addeqind (unsigned flags, unsigned offs, unsigned long val);
322 /* Emit += for the location with address in ax */
324 void g_subeqstatic (unsigned flags, unsigned long label, unsigned offs,
326 /* Emit -= for a static variable */
328 void g_subeqlocal (unsigned flags, int offs, unsigned long val);
329 /* Emit -= for a local variable */
331 void g_subeqind (unsigned flags, unsigned offs, unsigned long val);
332 /* Emit -= for the location with address in ax */
336 /*****************************************************************************/
337 /* Add a variable address to the value in ax */
338 /*****************************************************************************/
342 void g_addaddr_local (unsigned flags, int offs);
343 /* Add the address of a local variable to ax */
345 void g_addaddr_static (unsigned flags, unsigned long label, unsigned offs);
346 /* Add the address of a static variable to ax */
350 /*****************************************************************************/
352 /*****************************************************************************/
356 void g_save (unsigned flags);
357 /* Copy primary register to hold register. */
359 void g_restore (unsigned flags);
360 /* Copy hold register to primary. */
362 void g_cmp (unsigned flags, unsigned long val);
363 /* Immidiate compare. The primary register will not be changed, Z flag
367 void g_test (unsigned flags);
368 /* Test the value in the primary and set the condition codes */
370 void g_push (unsigned flags, unsigned long val);
371 /* Push the primary register or a constant value onto the stack */
373 void g_swap (unsigned flags);
374 /* Swap the primary register and the top of the stack. flags give the type
375 * of *both* values (must have same size).
378 void g_call (unsigned Flags, const char* Label, unsigned ArgSize);
379 /* Call the specified subroutine name */
381 void g_callind (unsigned Flags, unsigned ArgSize);
382 /* Call subroutine with address in AX */
384 void g_jump (unsigned Label);
385 /* Jump to specified internal label number */
387 void g_switch (unsigned Flags);
388 /* Output switch statement preamble */
390 void g_case (unsigned flags, unsigned label, unsigned long val);
391 /* Create table code for one case selector */
393 void g_truejump (unsigned flags, unsigned label);
394 /* Jump to label if zero flag clear */
396 void g_falsejump (unsigned flags, unsigned label);
397 /* Jump to label if zero flag set */
399 void g_space (int space);
400 /* Create or drop space on the stack */
402 void g_cstackcheck (void);
403 /* Check for a C stack overflow */
405 void g_stackcheck (void);
406 /* Check for a stack overflow */
408 void g_add (unsigned flags, unsigned long val);
409 void g_sub (unsigned flags, unsigned long val);
410 void g_rsub (unsigned flags, unsigned long val);
411 void g_mul (unsigned flags, unsigned long val);
412 void g_div (unsigned flags, unsigned long val);
413 void g_mod (unsigned flags, unsigned long val);
414 void g_or (unsigned flags, unsigned long val);
415 void g_xor (unsigned flags, unsigned long val);
416 void g_and (unsigned flags, unsigned long val);
417 void g_asr (unsigned flags, unsigned long val);
418 void g_asl (unsigned flags, unsigned long val);
419 void g_neg (unsigned flags);
420 void g_bneg (unsigned flags);
421 void g_com (unsigned flags);
422 void g_inc (unsigned flags, unsigned long n);
423 void g_dec (unsigned flags, unsigned long n);
424 void g_eq (unsigned flags, unsigned long val);
425 void g_ne (unsigned flags, unsigned long val);
426 void g_lt (unsigned flags, unsigned long val);
427 void g_le (unsigned flags, unsigned long val);
428 void g_gt (unsigned flags, unsigned long val);
429 void g_ge (unsigned flags, unsigned long val);
431 void g_res (unsigned n);
432 /* Reserve static storage, n bytes */
434 void g_defdata (unsigned flags, unsigned long val, unsigned offs);
435 /* Define data with the size given in flags */
437 void g_defbytes (const void* bytes, unsigned count);
438 /* Output a row of bytes as a constant */
440 void g_zerobytes (unsigned n);
441 /* Output n bytes of data initialized with zero */
445 /*****************************************************************************/
446 /* User supplied assembler code */
447 /*****************************************************************************/
451 void g_asmcode (const char* Line, int Len);
452 /* Output one line of assembler code. If Len is greater than zero, it is used
453 * as the maximum number of characters to use from Line.
458 /*****************************************************************************/
459 /* Inlined known functions */
460 /*****************************************************************************/
464 void g_strlen (unsigned flags, unsigned long val, unsigned offs);
465 /* Inline the strlen() function */
469 /* End of codegen.h */