1 /*****************************************************************************/
5 /* Expression descriptor structure */
9 /* (C) 2002-2004 Ullrich von Bassewitz */
11 /* D-70794 Filderstadt */
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 /*****************************************************************************/
48 /*****************************************************************************/
50 /*****************************************************************************/
54 ExprDesc* ED_Init (ExprDesc* Expr)
55 /* Initialize an ExprDesc */
68 const char* ED_GetLabelName (const ExprDesc* Expr, long Offs)
69 /* Return the assembler label name of the given expression. Beware: This
70 * function may use a static buffer, so the name may get "lost" on the second
71 * call to the function.
76 /* Expr may have it's own offset, adjust Offs accordingly */
79 /* Generate a label depending on the location */
80 switch (ED_GetLoc (Expr)) {
83 /* Absolute: numeric address or const */
84 xsprintf (Buf, sizeof (Buf), "$%04X", (int)(Offs & 0xFFFF));
89 /* Global or static variable */
91 xsprintf (Buf, sizeof (Buf), "%s%+ld",
92 SymGetAsmName (Expr->Sym), Offs);
94 xsprintf (Buf, sizeof (Buf), "%s",
95 SymGetAsmName (Expr->Sym));
100 /* Register variable */
101 xsprintf (Buf, sizeof (Buf), "regbank+%u",
102 (unsigned)((Offs + Expr->Name) & 0xFFFFU));
106 /* Literal in the literal pool */
108 xsprintf (Buf, sizeof (Buf), "%s%+ld",
109 LocalLabelName (Expr->Name), Offs);
111 xsprintf (Buf, sizeof (Buf), "%s",
112 LocalLabelName (Expr->Name));
117 Internal ("Invalid location in ED_GetLabelName: 0x%04X", ED_GetLoc (Expr));
120 /* Return a pointer to the static buffer */
126 ExprDesc* ED_MakeConstAbs (ExprDesc* Expr, long Value, type* Type)
127 /* Make Expr an absolute const with the given value and type. */
132 Expr->Flags = E_LOC_ABS | E_RTYPE_RVAL;
140 ExprDesc* ED_MakeConstAbsInt (ExprDesc* Expr, long Value)
141 /* Make Expr a constant integer expression with the given value */
144 Expr->Type = type_int;
146 Expr->Flags = E_LOC_ABS | E_RTYPE_RVAL;
154 ExprDesc* ED_MakeRValExpr (ExprDesc* Expr)
155 /* Convert Expr into a rvalue which is in the primary register without an
160 Expr->Val = 0; /* No offset */
161 Expr->Flags = (Expr->Flags & ~(E_MASK_LOC|E_MASK_RTYPE)) | (E_LOC_EXPR|E_RTYPE_RVAL);
169 ExprDesc* ED_MakeLValExpr (ExprDesc* Expr)
170 /* Convert Expr into a lvalue which is in the primary register without an
175 Expr->Val = 0; /* No offset */
176 Expr->Flags = (Expr->Flags & ~(E_MASK_LOC|E_MASK_RTYPE)) | (E_LOC_EXPR|E_RTYPE_LVAL);
184 int ED_IsConst (const ExprDesc* Expr)
185 /* Return true if the expression denotes a constant of some sort. This can be a
186 * numeric constant, the address of a global variable (maybe with offset) or
190 return ED_IsRVal (Expr) && (Expr->Flags & E_LOC_CONST) != 0;
195 int ED_IsConstAbs (const ExprDesc* Expr)
196 /* Return true if the expression denotes a constant absolute value. This can be
197 * a numeric constant, cast to any type.
200 return (Expr->Flags & (E_MASK_LOC|E_MASK_RTYPE)) == (E_LOC_ABS|E_RTYPE_RVAL);
205 int ED_IsConstAbsInt (const ExprDesc* Expr)
206 /* Return true if the expression is a constant (numeric) integer. */
208 return (Expr->Flags & (E_MASK_LOC|E_MASK_RTYPE)) == (E_LOC_ABS|E_RTYPE_RVAL) &&
209 IsClassInt (Expr->Type);
214 int ED_IsNullPtr (const ExprDesc* Expr)
215 /* Return true if the given expression is a NULL pointer constant */
217 return (Expr->Flags & (E_MASK_LOC|E_MASK_RTYPE)) == (E_LOC_ABS|E_RTYPE_RVAL) &&
219 IsClassInt (Expr->Type);
224 int ED_IsBool (const ExprDesc* Expr)
225 /* Return true of the expression can be treated as a boolean, that is, it can
226 * be an operand to a compare operation.
229 /* Either ints, floats, or pointers can be used in a boolean context */
230 return IsClassInt (Expr->Type) ||
231 IsClassFloat (Expr->Type) ||
232 IsClassPtr (Expr->Type);
237 void PrintExprDesc (FILE* F, ExprDesc* E)
238 /* Print an ExprDesc */
243 fprintf (F, "Symbol: %s\n", E->Sym? E->Sym->Name : "(none)");
245 fprintf (F, "Type: ");
246 PrintType (F, E->Type);
247 fprintf (F, "\nRaw type: ");
248 PrintRawType (F, E->Type);
250 fprintf (F, "Type: (unknown)\n"
251 "Raw type: (unknown)\n");
253 fprintf (F, "Value: 0x%08lX\n", E->Val);
257 fprintf (F, "Flags: 0x%04X ", Flags);
258 if (Flags & E_LOC_ABS) {
259 fprintf (F, "%cE_LOC_ABS", Sep);
263 if (Flags & E_LOC_GLOBAL) {
264 fprintf (F, "%cE_LOC_GLOBAL", Sep);
265 Flags &= ~E_LOC_GLOBAL;
268 if (Flags & E_LOC_STATIC) {
269 fprintf (F, "%cE_LOC_STATIC", Sep);
270 Flags &= ~E_LOC_STATIC;
273 if (Flags & E_LOC_REGISTER) {
274 fprintf (F, "%cE_LOC_REGISTER", Sep);
275 Flags &= ~E_LOC_REGISTER;
278 if (Flags & E_LOC_STACK) {
279 fprintf (F, "%cE_LOC_STACK", Sep);
280 Flags &= ~E_LOC_STACK;
283 if (Flags & E_LOC_PRIMARY) {
284 fprintf (F, "%cE_LOC_PRIMARY", Sep);
285 Flags &= ~E_LOC_PRIMARY;
288 if (Flags & E_LOC_EXPR) {
289 fprintf (F, "%cE_LOC_EXPR", Sep);
290 Flags &= ~E_LOC_EXPR;
293 if (Flags & E_LOC_LITERAL) {
294 fprintf (F, "%cE_LOC_LITERAL", Sep);
295 Flags &= ~E_LOC_LITERAL;
298 if (Flags & E_RTYPE_LVAL) {
299 fprintf (F, "%cE_RTYPE_LVAL", Sep);
300 Flags &= ~E_RTYPE_LVAL;
304 fprintf (F, "%c,0x%04X", Sep, Flags);
312 fprintf (F, "\nTest: ");
313 if (E->Test & E_CC) {
314 fprintf (F, "E_CC ");
316 if (E->Test & E_FORCETEST) {
317 fprintf (F, "E_FORCETEST ");
320 fprintf (F, "\nName: 0x%08lX\n", E->Name);
325 type* ReplaceType (ExprDesc* Expr, const type* NewType)
326 /* Replace the type of Expr by a copy of Newtype and return the old type string */
328 type* OldType = Expr->Type;
329 Expr->Type = TypeDup (NewType);