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 static void SetUseChgInfo (CodeEntry* E, const OPCDesc* D)
137 /* Set the Use and Chg in E */
139 /* If this is a subroutine call, or a jump to an external function,
140 * lookup the information about this function and use it. The jump itself
141 * does not change any registers, so we don't need to use the data from D.
143 if ((E->Info & (OF_BRA | OF_CALL)) != 0 && E->JumpTo == 0) {
144 /* A subroutine call or jump to external symbol (function exit) */
145 GetFuncInfo (E->Arg, &E->Use, &E->Chg);
147 /* Some other instruction. Use the values from the opcode description
148 * plus addressing mode info
150 E->Use = D->Use | GetAMUseInfo (E->AM);
157 /*****************************************************************************/
159 /*****************************************************************************/
163 CodeEntry* NewCodeEntry (opc_t OPC, am_t AM, const char* Arg,
164 CodeLabel* JumpTo, LineInfo* LI)
165 /* Create a new code entry, initialize and return it */
167 /* Get the opcode description */
168 const OPCDesc* D = GetOPCDesc (OPC);
170 /* Allocate memory */
171 CodeEntry* E = xmalloc (sizeof (CodeEntry));
173 /* Initialize the fields */
176 E->Arg = GetArgCopy (Arg);
177 E->Flags = NumArg (E->Arg, &E->Num)? CEF_NUMARG : 0;
179 E->Size = GetInsnSize (E->OPC, E->AM);
181 E->LI = UseLineInfo (LI);
182 SetUseChgInfo (E, D);
183 InitCollection (&E->Labels);
185 /* If we have a label given, add this entry to the label */
187 CollAppend (&JumpTo->JumpFrom, E);
190 /* Return the initialized struct */
196 void FreeCodeEntry (CodeEntry* E)
197 /* Free the given code entry */
199 /* Free the string argument if we have one */
202 /* Cleanup the collection */
203 DoneCollection (&E->Labels);
205 /* Release the line info */
206 ReleaseLineInfo (E->LI);
214 void CE_ReplaceOPC (CodeEntry* E, opc_t OPC)
215 /* Replace the opcode of the instruction. This will also replace related info,
216 * Size, Use and Chg, but it will NOT update any arguments or labels.
219 /* Get the opcode descriptor */
220 const OPCDesc* D = GetOPCDesc (OPC);
222 /* Replace the opcode */
225 E->Size = GetInsnSize (E->OPC, E->AM);
226 SetUseChgInfo (E, D);
231 int CodeEntriesAreEqual (const CodeEntry* E1, const CodeEntry* E2)
232 /* Check if both code entries are equal */
234 return E1->OPC == E2->OPC && E1->AM == E2->AM && strcmp (E1->Arg, E2->Arg) == 0;
239 void CE_AttachLabel (CodeEntry* E, CodeLabel* L)
240 /* Attach the label to the entry */
242 /* Add it to the entries label list */
243 CollAppend (&E->Labels, L);
245 /* Tell the label about it's owner */
251 void CE_MoveLabel (CodeLabel* L, CodeEntry* E)
252 /* Move the code label L from it's former owner to the code entry E. */
254 /* Delete the label from the owner */
255 CollDeleteItem (&L->Owner->Labels, L);
257 /* Set the new owner */
258 CollAppend (&E->Labels, L);
264 void CE_SetArg (CodeEntry* E, const char* Arg)
265 /* Set a new argument for the given code entry. An old string is deleted. */
267 /* Free the old argument */
270 /* Assign the new one */
271 E->Arg = GetArgCopy (Arg);
276 void CE_Output (const CodeEntry* E, FILE* F)
277 /* Output the code entry to a file */
283 /* If we have a label, print that */
284 unsigned LabelCount = CollCount (&E->Labels);
286 for (I = 0; I < LabelCount; ++I) {
287 CL_Output (CollConstAt (&E->Labels, I), F);
290 /* Get the opcode description */
291 D = GetOPCDesc (E->OPC);
293 /* Print the mnemonic */
294 Chars = fprintf (F, "\t%s", D->Mnemo);
296 /* Print the operand */
306 Chars += fprintf (F, "%*sa", 9-Chars, "");
312 Chars += fprintf (F, "%*s#%s", 9-Chars, "", E->Arg);
318 /* zeropage and absolute */
319 Chars += fprintf (F, "%*s%s", 9-Chars, "", E->Arg);
324 /* zeropage,X and absolute,X */
325 Chars += fprintf (F, "%*s%s,x", 9-Chars, "", E->Arg);
330 Chars += fprintf (F, "%*s%s,y", 9-Chars, "", E->Arg);
335 Chars += fprintf (F, "%*s(%s,x)", 9-Chars, "", E->Arg);
340 Chars += fprintf (F, "%*s(%s),y", 9-Chars, "", E->Arg);
345 Chars += fprintf (F, "%*s(%s)", 9-Chars, "", E->Arg);
350 Target = E->JumpTo? E->JumpTo->Name : E->Arg;
351 Chars += fprintf (F, "%*s%s", 9-Chars, "", Target);
355 Internal ("Invalid addressing mode");
359 /* Print usage info if requested by the debugging flag */
362 "%*s; USE: %c%c%c CHG: %c%c%c SIZE: %u\n",
364 (E->Use & REG_A)? 'A' : '_',
365 (E->Use & REG_X)? 'X' : '_',
366 (E->Use & REG_Y)? 'Y' : '_',
367 (E->Chg & REG_A)? 'A' : '_',
368 (E->Chg & REG_X)? 'X' : '_',
369 (E->Chg & REG_Y)? 'Y' : '_',
372 /* Terminate the line */