1 /*****************************************************************************/
5 /* Code segment entry */
9 /* (C) 2001 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 /*****************************************************************************/
54 /*****************************************************************************/
56 /*****************************************************************************/
61 static char EmptyArg[] = "";
65 /*****************************************************************************/
66 /* Helper functions */
67 /*****************************************************************************/
71 static void FreeArg (char* Arg)
72 /* Free a code entry argument */
74 if (Arg != EmptyArg) {
81 static char* GetArgCopy (const char* Arg)
82 /* Create an argument copy for assignment */
84 if (Arg && Arg[0] != '\0') {
88 /* Use the empty argument string */
95 static int NumArg (const char* Arg, unsigned long* Num)
96 /* If the given argument is numerical, convert it and return true. Otherwise
97 * set Num to zero and return false.
103 /* Determine the base */
108 } else if (*Arg == '%') {
113 /* Convert the value. strtol is not exactly what we want here, but it's
114 * cheap and may be replaced by something fancier later.
116 Val = strtoul (Arg, &End, Base);
118 /* Check if the conversion was successful */
121 /* Could not convert */
136 /*****************************************************************************/
138 /*****************************************************************************/
142 CodeEntry* NewCodeEntry (opc_t OPC, am_t AM, const char* Arg, CodeLabel* JumpTo)
143 /* Create a new code entry, initialize and return it */
145 /* Get the opcode description */
146 const OPCDesc* D = GetOPCDesc (OPC);
148 /* Allocate memory */
149 CodeEntry* E = xmalloc (sizeof (CodeEntry));
151 /* Initialize the fields */
154 E->Size = GetInsnSize (E->OPC, E->AM);
156 E->Arg = GetArgCopy (Arg);
157 if (NumArg (E->Arg, &E->Num)) {
158 E-> Flags = CEF_NUMARG;
165 if (E->OPC == OPC_JSR) {
166 /* A subroutine call */
167 GetFuncInfo (E->Arg, &E->Use, &E->Chg);
168 } else if ((E->Info & OF_BRA) != 0 && JumpTo == 0) {
169 /* Jump to external symbol (function exit) */
170 GetFuncInfo (E->Arg, &E->Use, &E->Chg);
172 /* Some other instruction */
173 E->Use |= GetAMUseInfo (E->AM);
176 InitCollection (&E->Labels);
178 /* If we have a label given, add this entry to the label */
180 CollAppend (&JumpTo->JumpFrom, E);
183 /* Return the initialized struct */
189 void FreeCodeEntry (CodeEntry* E)
190 /* Free the given code entry */
192 /* Free the string argument if we have one */
195 /* Cleanup the collection */
196 DoneCollection (&E->Labels);
204 void ReplaceOPC (CodeEntry* E, opc_t OPC)
205 /* Replace the opcode of the instruction. This will also replace related info,
206 * Size, Use and Chg, but it will NOT update any arguments or labels.
209 /* Get the opcode descriptor */
210 const OPCDesc* D = GetOPCDesc (OPC);
212 /* Replace the opcode */
214 E->Size = GetInsnSize (E->OPC, E->AM);
218 if (E->OPC == OPC_JSR) {
219 /* A subroutine call */
220 GetFuncInfo (E->Arg, &E->Use, &E->Chg);
222 /* Some other instruction */
223 E->Use |= GetAMUseInfo (E->AM);
229 int CodeEntriesAreEqual (const CodeEntry* E1, const CodeEntry* E2)
230 /* Check if both code entries are equal */
232 return E1->OPC == E2->OPC && E1->AM == E2->AM && strcmp (E1->Arg, E2->Arg) == 0;
237 void AttachCodeLabel (CodeEntry* E, CodeLabel* L)
238 /* Attach the label to the entry */
240 /* Mark the label as defined */
243 /* Add it to the entries label list */
244 CollAppend (&E->Labels, L);
246 /* Tell the label about it's owner */
252 void MoveCodeLabel (CodeLabel* L, CodeEntry* E)
253 /* Move the code label L from it's former owner to the code entry E. */
255 /* Delete the label from the owner */
256 CollDeleteItem (&L->Owner->Labels, L);
258 /* Set the new owner */
259 CollAppend (&E->Labels, L);
265 void CodeEntrySetArg (CodeEntry* E, const char* Arg)
266 /* Set a new argument for the given code entry. An old string is deleted. */
268 /* Free the old argument */
271 /* Assign the new one */
272 E->Arg = GetArgCopy (Arg);
277 void OutputCodeEntry (const CodeEntry* E, FILE* F)
278 /* Output the code entry to a file */
284 /* If we have a label, print that */
285 unsigned LabelCount = CollCount (&E->Labels);
287 for (I = 0; I < LabelCount; ++I) {
288 OutputCodeLabel (CollConstAt (&E->Labels, I), F);
291 /* Get the opcode description */
292 D = GetOPCDesc (E->OPC);
294 /* Print the mnemonic */
295 Chars = fprintf (F, "\t%s", D->Mnemo);
297 /* Print the operand */
306 Chars += fprintf (F, "%*sa", 9-Chars, "");
311 Chars += fprintf (F, "%*s#%s", 9-Chars, "", E->Arg);
316 /* zeropage and absolute */
317 Chars += fprintf (F, "%*s%s", 9-Chars, "", E->Arg);
322 /* zeropage,X and absolute,X */
323 Chars += fprintf (F, "%*s%s,x", 9-Chars, "", E->Arg);
328 Chars += fprintf (F, "%*s%s,y", 9-Chars, "", E->Arg);
333 Chars += fprintf (F, "%*s(%s,x)", 9-Chars, "", E->Arg);
338 Chars += fprintf (F, "%*s(%s),y", 9-Chars, "", E->Arg);
343 Chars += fprintf (F, "%*s(%s)", 9-Chars, "", E->Arg);
348 Target = E->JumpTo? E->JumpTo->Name : E->Arg;
349 Chars += fprintf (F, "%*s%s", 9-Chars, "", Target);
353 Internal ("Invalid addressing mode");
357 /* Print usage info if requested by the debugging flag */
360 "%*s; USE: %c%c%c CHG: %c%c%c",
362 (E->Use & REG_A)? 'A' : '_',
363 (E->Use & REG_X)? 'X' : '_',
364 (E->Use & REG_Y)? 'Y' : '_',
365 (E->Chg & REG_A)? 'A' : '_',
366 (E->Chg & REG_X)? 'X' : '_',
367 (E->Chg & REG_Y)? 'Y' : '_');