1 /*****************************************************************************/
5 /* 6502 code generator */
9 /* (C) 1998 Ullrich 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 /*****************************************************************************/
41 /*****************************************************************************/
43 /*****************************************************************************/
47 /* Code generator flags.
48 * Note: The type flags are designed so that a smaller type may override a
49 * larger one by or'ing it into the existing one.
51 #define CF_NONE 0x0000 /* No special flags */
53 #define CF_TYPE 0x0007 /* Mask for operand type */
54 #define CF_CHAR 0x0003 /* Operation on characters */
55 #define CF_INT 0x0001 /* Operation on ints */
56 #define CF_PTR CF_INT /* Alias for readability */
57 #define CF_LONG 0x0000 /* Operation on longs */
59 #define CF_NOKEEP 0x0008 /* Value may get destroyed when storing */
61 #define CF_UNSIGNED 0x0010 /* Value is unsigned */
62 #define CF_CONST 0x0020 /* Constant value available */
63 #define CF_CONSTADDR 0x0040 /* Constant address value available */
64 #define CF_TEST 0x0080 /* Test value */
65 #define CF_FIXARGC 0x0100 /* Function has fixed arg count */
66 #define CF_FORCECHAR 0x0200 /* Handle chars as chars, not ints */
67 #define CF_SHORT 0x0400 /* Use short addressing */
68 #define CF_REG 0x0800 /* Value is in primary register */
70 /* Type of static address */
71 #define CF_ADDRMASK 0xF000 /* Type of address */
72 #define CF_STATIC 0x0000 /* Static local */
73 #define CF_EXTERNAL 0x1000 /* Static external */
74 #define CF_ABSOLUTE 0x2000 /* Numeric absolute address */
75 #define CF_LOCAL 0x4000 /* Auto variable */
76 #define CF_REGVAR 0x8000 /* Register variable */
80 /* Compiler relative stackpointer */
85 /*****************************************************************************/
86 /* Pre- and postamble */
87 /*****************************************************************************/
91 void g_preamble (void);
92 /* Generate the assembler code preamble */
94 void g_postamble (void);
95 /* Generate assembler code postamble */
99 /*****************************************************************************/
100 /* Segment support */
101 /*****************************************************************************/
105 void g_usecode (void);
106 /* Switch to the code segment */
108 void g_userodata (void);
109 /* Switch to the read only data segment */
111 void g_usedata (void);
112 /* Switch to the data segment */
114 void g_usebss (void);
115 /* Switch to the bss segment */
117 void g_codename (const char* Name);
118 /* Set the name of the CODE segment */
120 void g_rodataname (const char* Name);
121 /* Set the name of the RODATA segment */
123 void g_dataname (const char* Name);
124 /* Set the name of the DATA segment */
126 void g_bssname (const char* Name);
127 /* Set the name of the BSS segment */
131 /*****************************************************************************/
132 /* Functions handling local labels */
133 /*****************************************************************************/
137 void g_defloclabel (unsigned label);
138 /* Define a local label */
142 /*****************************************************************************/
143 /* Functions handling global labels */
144 /*****************************************************************************/
148 void g_defgloblabel (const char* Name);
149 /* Define a global label with the given name */
151 void g_defexport (const char* Name, int ZP);
152 /* Export the given label */
154 void g_defimport (const char* Name, int ZP);
155 /* Import the given label */
159 /*****************************************************************************/
161 /*****************************************************************************/
165 int pop (unsigned flags);
166 /* Pop an argument of the given size */
168 int push (unsigned flags);
169 /* Push an argument of the given size */
171 unsigned sizeofarg (unsigned flags);
172 /* Return the size of a function argument type that is encoded in flags */
176 /*****************************************************************************/
177 /* type conversion and similiar stuff */
178 /*****************************************************************************/
182 void g_toslong (unsigned flags);
183 /* Make sure, the value on TOS is a long. Convert if necessary */
185 void g_tosint (unsigned flags);
186 /* Make sure, the value on TOS is an int. Convert if necessary */
188 void g_reglong (unsigned flags);
189 /* Make sure, the value in the primary register a long. Convert if necessary */
191 unsigned g_typeadjust (unsigned lhs, unsigned rhs);
192 /* Adjust the integer operands before doing a binary operation. lhs is a flags
193 * value, that corresponds to the value on TOS, rhs corresponds to the value
194 * in (e)ax. The return value is the the flags value for the resulting type.
197 unsigned g_typecast (unsigned lhs, unsigned rhs);
198 /* Cast the value in the primary register to the operand size that is flagged
199 * by the lhs value. Return the result value.
202 void g_scale (unsigned flags, long val);
203 /* Scale the value in the primary register by the given value. If val is positive,
204 * scale up, is val is negative, scale down. This function is used to scale
205 * the operands or results of pointer arithmetic by the size of the type, the
211 /*****************************************************************************/
212 /* Function entry and exit */
213 /*****************************************************************************/
217 void g_enter (unsigned flags, unsigned argsize);
218 /* Function prologue */
220 void g_leave (int flags, int val);
221 /* Function epilogue */
225 /*****************************************************************************/
226 /* Register variables */
227 /*****************************************************************************/
231 void g_save_regvars (int RegOffs, unsigned Bytes);
232 /* Save register variables */
234 void g_restore_regvars (int StackOffs, int RegOffs, unsigned Bytes);
235 /* Restore register variables */
239 /*****************************************************************************/
240 /* Fetching memory cells */
241 /*****************************************************************************/
245 void g_getimmed (unsigned Flags, unsigned long Val, unsigned Offs);
246 /* Load a constant into the primary register */
248 void g_getstatic (unsigned Flags, unsigned long Label, unsigned Offs);
249 /* Fetch an static memory cell into the primary register */
251 void g_getlocal (unsigned Flags, int Offs);
252 /* Fetch specified local object (local var). */
254 void g_getind (unsigned Flags, unsigned Offs);
255 /* Fetch the specified object type indirect through the primary register
256 * into the primary register
259 void g_leasp (int Offs);
260 /* Fetch the address of the specified symbol into the primary register */
262 void g_leavariadic (int Offs);
263 /* Fetch the address of a parameter in a variadic function into the primary
269 /*****************************************************************************/
270 /* Store into memory */
271 /*****************************************************************************/
275 void g_putstatic (unsigned flags, unsigned long label, unsigned offs);
276 /* Store the primary register into the specified static memory cell */
278 void g_putlocal (unsigned Flags, int Offs, long Val);
279 /* Put data into local object. */
281 void g_putind (unsigned flags, unsigned offs);
282 /* Store the specified object type in the primary register at the address
283 * on the top of the stack
288 /*****************************************************************************/
289 /* Adds and subs of variables fix a fixed address */
290 /*****************************************************************************/
294 void g_addlocal (unsigned flags, int offs);
295 /* Add a local variable to ax */
297 void g_addstatic (unsigned flags, unsigned long label, unsigned offs);
298 /* Add a static variable to ax */
302 /*****************************************************************************/
303 /* Compares of ax with a variable with fixed address */
304 /*****************************************************************************/
308 void g_cmplocal (unsigned flags, int offs);
309 /* Compare a local variable to ax */
311 void g_cmpstatic (unsigned flags, unsigned label, unsigned offs);
312 /* Compare a static variable to ax */
316 /*****************************************************************************/
317 /* Special op= functions */
318 /*****************************************************************************/
322 void g_addeqstatic (unsigned flags, unsigned long label, unsigned offs,
324 /* Emit += for a static variable */
326 void g_addeqlocal (unsigned flags, int offs, unsigned long val);
327 /* Emit += for a local variable */
329 void g_addeqind (unsigned flags, unsigned offs, unsigned long val);
330 /* Emit += for the location with address in ax */
332 void g_subeqstatic (unsigned flags, unsigned long label, unsigned offs,
334 /* Emit -= for a static variable */
336 void g_subeqlocal (unsigned flags, int offs, unsigned long val);
337 /* Emit -= for a local variable */
339 void g_subeqind (unsigned flags, unsigned offs, unsigned long val);
340 /* Emit -= for the location with address in ax */
344 /*****************************************************************************/
345 /* Add a variable address to the value in ax */
346 /*****************************************************************************/
350 void g_addaddr_local (unsigned flags, int offs);
351 /* Add the address of a local variable to ax */
353 void g_addaddr_static (unsigned flags, unsigned long label, unsigned offs);
354 /* Add the address of a static variable to ax */
358 /*****************************************************************************/
360 /*****************************************************************************/
364 void g_save (unsigned flags);
365 void g_restore (unsigned flags);
367 void g_cmp (unsigned flags, unsigned long val);
368 /* Immidiate compare. The primary register will not be changed, Z flag
372 void g_test (unsigned flags);
373 void g_push (unsigned flags, unsigned long val);
374 void g_swap (unsigned flags);
376 void g_call (unsigned Flags, const char* Label, unsigned ArgSize);
377 /* Call the specified subroutine name */
379 void g_callind (unsigned Flags, unsigned ArgSize);
380 /* Call subroutine with address in AX */
382 void g_jump (unsigned Label);
383 /* Jump to specified internal label number */
385 void g_switch (unsigned Flags);
386 /* Output switch statement preamble */
388 void g_case (unsigned flags, unsigned label, unsigned long val);
389 /* Create table code for one case selector */
391 void g_truejump (unsigned flags, unsigned label);
392 /* Jump to label if zero flag clear */
394 void g_falsejump (unsigned flags, unsigned label);
395 /* Jump to label if zero flag set */
397 void g_space (int space);
398 /* Create or drop space on the stack */
400 void g_cstackcheck (void);
401 /* Check for a C stack overflow */
403 void g_stackcheck (void);
404 /* Check for a stack overflow */
406 void g_add (unsigned flags, unsigned long val);
407 void g_sub (unsigned flags, unsigned long val);
408 void g_rsub (unsigned flags, unsigned long val);
409 void g_mul (unsigned flags, unsigned long val);
410 void g_div (unsigned flags, unsigned long val);
411 void g_mod (unsigned flags, unsigned long val);
412 void g_or (unsigned flags, unsigned long val);
413 void g_xor (unsigned flags, unsigned long val);
414 void g_and (unsigned flags, unsigned long val);
415 void g_asr (unsigned flags, unsigned long val);
416 void g_asl (unsigned flags, unsigned long val);
417 void g_neg (unsigned flags);
418 void g_bneg (unsigned flags);
419 void g_com (unsigned flags);
420 void g_inc (unsigned flags, unsigned long n);
421 void g_dec (unsigned flags, unsigned long n);
422 void g_eq (unsigned flags, unsigned long val);
423 void g_ne (unsigned flags, unsigned long val);
424 void g_lt (unsigned flags, unsigned long val);
425 void g_le (unsigned flags, unsigned long val);
426 void g_gt (unsigned flags, unsigned long val);
427 void g_ge (unsigned flags, unsigned long val);
429 void g_res (unsigned n);
430 /* Reserve static storage, n bytes */
432 void g_defdata (unsigned flags, unsigned long val, unsigned offs);
433 /* Define data with the size given in flags */
435 void g_defbytes (const void* bytes, unsigned count);
436 /* Output a row of bytes as a constant */
438 void g_zerobytes (unsigned n);
439 /* Output n bytes of data initialized with zero */
443 /*****************************************************************************/
444 /* Inlined known functions */
445 /*****************************************************************************/
449 void g_strlen (unsigned flags, unsigned long val, unsigned offs);
450 /* Inline the strlen() function */
454 /* End of codegen.h */