1 /*****************************************************************************/
5 /* 6502 code generator */
9 /* (C) 1998-2001 Ullrich 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 /*****************************************************************************/
49 /*****************************************************************************/
51 /*****************************************************************************/
55 /* Code generator flags.
56 * Note: The type flags are designed so that a smaller type may override a
57 * larger one by or'ing it into the existing one.
59 #define CF_NONE 0x0000 /* No special flags */
61 #define CF_TYPE 0x0007 /* Mask for operand type */
62 #define CF_CHAR 0x0003 /* Operation on characters */
63 #define CF_INT 0x0001 /* Operation on ints */
64 #define CF_PTR CF_INT /* Alias for readability */
65 #define CF_LONG 0x0000 /* Operation on longs */
67 #define CF_NOKEEP 0x0008 /* Value may get destroyed when storing */
69 #define CF_UNSIGNED 0x0010 /* Value is unsigned */
70 #define CF_CONST 0x0020 /* Constant value available */
71 #define CF_CONSTADDR 0x0040 /* Constant address value available */
72 #define CF_TEST 0x0080 /* Test value */
73 #define CF_FIXARGC 0x0100 /* Function has fixed arg count */
74 #define CF_FORCECHAR 0x0200 /* Handle chars as chars, not ints */
75 #define CF_REG 0x0800 /* Value is in primary register */
77 /* Type of static address */
78 #define CF_ADDRMASK 0xF000 /* Type of address */
79 #define CF_STATIC 0x0000 /* Static local */
80 #define CF_EXTERNAL 0x1000 /* Static external */
81 #define CF_ABSOLUTE 0x2000 /* Numeric absolute address */
82 #define CF_LOCAL 0x4000 /* Auto variable */
83 #define CF_REGVAR 0x8000 /* Register variable */
87 /* Compiler relative stackpointer */
95 /*****************************************************************************/
96 /* Files, pre- and postamble */
97 /*****************************************************************************/
101 void g_preamble (void);
102 /* Generate the assembler code preamble */
104 void g_fileinfo (const char* Name, unsigned long Size, unsigned long MTime);
105 /* If debug info is enabled, place a file info into the source */
109 /*****************************************************************************/
110 /* Segment support */
111 /*****************************************************************************/
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_segname (segment_t Seg, const char* Name);
125 /* Set the name of a segment */
129 /*****************************************************************************/
130 /* Functions handling local labels */
131 /*****************************************************************************/
135 void g_defcodelabel (unsigned label);
136 /* Define a local code label */
138 void g_defdatalabel (unsigned label);
139 /* Define a local data label */
143 /*****************************************************************************/
144 /* Functions handling global labels */
145 /*****************************************************************************/
149 void g_defgloblabel (const char* Name);
150 /* Define a global label with the given name */
152 void g_defexport (const char* Name, int ZP);
153 /* Export the given label */
155 void g_defimport (const char* Name, int ZP);
156 /* Import the given label */
160 /*****************************************************************************/
162 /*****************************************************************************/
166 int pop (unsigned flags);
167 /* Pop an argument of the given size */
169 int push (unsigned flags);
170 /* Push an argument of the given size */
172 unsigned sizeofarg (unsigned flags);
173 /* Return the size of a function argument type that is encoded in flags */
177 /*****************************************************************************/
178 /* type conversion and similiar stuff */
179 /*****************************************************************************/
183 void g_toslong (unsigned flags);
184 /* Make sure, the value on TOS is a long. Convert if necessary */
186 void g_tosint (unsigned flags);
187 /* Make sure, the value on TOS is an int. Convert if necessary */
189 void g_reglong (unsigned flags);
190 /* Make sure, the value in the primary register a long. Convert if necessary */
192 unsigned g_typeadjust (unsigned lhs, unsigned rhs);
193 /* Adjust the integer operands before doing a binary operation. lhs is a flags
194 * value, that corresponds to the value on TOS, rhs corresponds to the value
195 * in (e)ax. The return value is the the flags value for the resulting type.
198 unsigned g_typecast (unsigned lhs, unsigned rhs);
199 /* Cast the value in the primary register to the operand size that is flagged
200 * by the lhs value. Return the result value.
203 void g_scale (unsigned flags, long val);
204 /* Scale the value in the primary register by the given value. If val is positive,
205 * scale up, is val is negative, scale down. This function is used to scale
206 * the operands or results of pointer arithmetic by the size of the type, the
212 /*****************************************************************************/
213 /* Function entry and exit */
214 /*****************************************************************************/
218 void g_enter (unsigned flags, unsigned argsize);
219 /* Function prologue */
222 /* Function epilogue */
226 /*****************************************************************************/
227 /* Register variables */
228 /*****************************************************************************/
232 void g_save_regvars (int RegOffs, unsigned Bytes);
233 /* Save register variables */
235 void g_restore_regvars (int StackOffs, int RegOffs, unsigned Bytes);
236 /* Restore register variables */
240 /*****************************************************************************/
241 /* Fetching memory cells */
242 /*****************************************************************************/
246 void g_getimmed (unsigned Flags, unsigned long Val, long Offs);
247 /* Load a constant into the primary register */
249 void g_getstatic (unsigned Flags, unsigned long Label, long Offs);
250 /* Fetch an static memory cell into the primary register */
252 void g_getlocal (unsigned Flags, int Offs);
253 /* Fetch specified local object (local var). */
255 void g_getind (unsigned Flags, unsigned Offs);
256 /* Fetch the specified object type indirect through the primary register
257 * into the primary register
260 void g_leasp (int Offs);
261 /* Fetch the address of the specified symbol into the primary register */
263 void g_leavariadic (int Offs);
264 /* Fetch the address of a parameter in a variadic function into the primary
270 /*****************************************************************************/
271 /* Store into memory */
272 /*****************************************************************************/
276 void g_putstatic (unsigned flags, unsigned long label, long offs);
277 /* Store the primary register into the specified static memory cell */
279 void g_putlocal (unsigned Flags, int Offs, long Val);
280 /* Put data into local object. */
282 void g_putind (unsigned flags, unsigned offs);
283 /* Store the specified object type in the primary register at the address
284 * on the top of the stack
289 /*****************************************************************************/
290 /* Adds and subs of variables fix a fixed address */
291 /*****************************************************************************/
295 void g_addlocal (unsigned flags, int offs);
296 /* Add a local variable to ax */
298 void g_addstatic (unsigned flags, unsigned long label, long offs);
299 /* Add a static variable to ax */
303 /*****************************************************************************/
304 /* Special op= functions */
305 /*****************************************************************************/
309 void g_addeqstatic (unsigned flags, unsigned long label, long offs,
311 /* Emit += for a static variable */
313 void g_addeqlocal (unsigned flags, int offs, unsigned long val);
314 /* Emit += for a local variable */
316 void g_addeqind (unsigned flags, unsigned offs, unsigned long val);
317 /* Emit += for the location with address in ax */
319 void g_subeqstatic (unsigned flags, unsigned long label, long offs,
321 /* Emit -= for a static variable */
323 void g_subeqlocal (unsigned flags, int offs, unsigned long val);
324 /* Emit -= for a local variable */
326 void g_subeqind (unsigned flags, unsigned offs, unsigned long val);
327 /* Emit -= for the location with address in ax */
331 /*****************************************************************************/
332 /* Add a variable address to the value in ax */
333 /*****************************************************************************/
337 void g_addaddr_local (unsigned flags, int offs);
338 /* Add the address of a local variable to ax */
340 void g_addaddr_static (unsigned flags, unsigned long label, long offs);
341 /* Add the address of a static variable to ax */
345 /*****************************************************************************/
347 /*****************************************************************************/
351 void g_save (unsigned flags);
352 /* Copy primary register to hold register. */
354 void g_restore (unsigned flags);
355 /* Copy hold register to primary. */
357 void g_cmp (unsigned flags, unsigned long val);
358 /* Immidiate compare. The primary register will not be changed, Z flag
362 void g_test (unsigned flags);
363 /* Test the value in the primary and set the condition codes */
365 void g_push (unsigned flags, unsigned long val);
366 /* Push the primary register or a constant value onto the stack */
368 void g_swap (unsigned flags);
369 /* Swap the primary register and the top of the stack. flags give the type
370 * of *both* values (must have same size).
373 void g_call (unsigned Flags, const char* Label, unsigned ArgSize);
374 /* Call the specified subroutine name */
376 void g_callind (unsigned Flags, unsigned ArgSize, int Offs);
377 /* Call subroutine indirect */
379 void g_jump (unsigned Label);
380 /* Jump to specified internal label number */
382 void g_truejump (unsigned flags, unsigned label);
383 /* Jump to label if zero flag clear */
385 void g_falsejump (unsigned flags, unsigned label);
386 /* Jump to label if zero flag set */
388 void g_space (int space);
389 /* Create or drop space on the stack */
391 void g_cstackcheck (void);
392 /* Check for a C stack overflow */
394 void g_stackcheck (void);
395 /* Check for a stack overflow */
397 void g_add (unsigned flags, unsigned long val);
398 void g_sub (unsigned flags, unsigned long val);
399 void g_rsub (unsigned flags, unsigned long val);
400 void g_mul (unsigned flags, unsigned long val);
401 void g_div (unsigned flags, unsigned long val);
402 void g_mod (unsigned flags, unsigned long val);
403 void g_or (unsigned flags, unsigned long val);
404 void g_xor (unsigned flags, unsigned long val);
405 void g_and (unsigned flags, unsigned long val);
406 void g_asr (unsigned flags, unsigned long val);
407 void g_asl (unsigned flags, unsigned long val);
408 void g_neg (unsigned flags);
409 void g_bneg (unsigned flags);
410 void g_com (unsigned flags);
411 void g_inc (unsigned flags, unsigned long n);
412 void g_dec (unsigned flags, unsigned long n);
413 void g_eq (unsigned flags, unsigned long val);
414 void g_ne (unsigned flags, unsigned long val);
415 void g_lt (unsigned flags, unsigned long val);
416 void g_le (unsigned flags, unsigned long val);
417 void g_gt (unsigned flags, unsigned long val);
418 void g_ge (unsigned flags, unsigned long val);
420 void g_res (unsigned n);
421 /* Reserve static storage, n bytes */
423 void g_defdata (unsigned flags, unsigned long val, long offs);
424 /* Define data with the size given in flags */
426 void g_defbytes (const void* bytes, unsigned count);
427 /* Output a row of bytes as a constant */
429 void g_zerobytes (unsigned n);
430 /* Output n bytes of data initialized with zero */
434 /*****************************************************************************/
435 /* Switch statement */
436 /*****************************************************************************/
440 void g_switch (Collection* Nodes, unsigned DefaultLabel, unsigned Depth);
441 /* Generate code for a switch statement */
445 /*****************************************************************************/
446 /* User supplied assembler code */
447 /*****************************************************************************/
451 void g_asmcode (struct StrBuf* B);
452 /* Output one line of assembler code. */
456 /*****************************************************************************/
457 /* Inlined known functions */
458 /*****************************************************************************/
462 void g_strlen (unsigned flags, unsigned long val, long offs);
463 /* Inline the strlen() function */
467 /* End of codegen.h */