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 /*****************************************************************************/
50 /*****************************************************************************/
52 /*****************************************************************************/
56 ExprDesc* ED_Init (ExprDesc* Expr)
57 /* Initialize an ExprDesc */
70 const char* ED_GetLabelName (const ExprDesc* Expr, long Offs)
71 /* Return the assembler label name of the given expression. Beware: This
72 * function may use a static buffer, so the name may get "lost" on the second
73 * call to the function.
76 static StrBuf Buf = STATIC_STRBUF_INITIALIZER;
78 /* Expr may have it's own offset, adjust Offs accordingly */
81 /* Generate a label depending on the location */
82 switch (ED_GetLoc (Expr)) {
85 /* Absolute: numeric address or const */
86 SB_Printf (&Buf, "$%04X", (int)(Offs & 0xFFFF));
91 /* Global or static variable */
93 SB_Printf (&Buf, "%s%+ld", SymGetAsmName (Expr->Sym), Offs);
95 SB_Printf (&Buf, "%s", SymGetAsmName (Expr->Sym));
100 /* Register variable */
101 SB_Printf (&Buf, "regbank+%u", (unsigned)((Offs + Expr->Name) & 0xFFFFU));
105 /* Literal in the literal pool */
107 SB_Printf (&Buf, "%s%+ld", LocalLabelName (Expr->Name), Offs);
109 SB_Printf (&Buf, "%s", LocalLabelName (Expr->Name));
114 Internal ("Invalid location in ED_GetLabelName: 0x%04X", ED_GetLoc (Expr));
117 /* Return a pointer to the static buffer */
118 return SB_GetConstBuf (&Buf);
123 int ED_GetStackOffs (const ExprDesc* Expr, int Offs)
124 /* Get the stack offset of an address on the stack in Expr taking into account
125 * an additional offset in Offs.
128 PRECONDITION (ED_IsLocStack (Expr));
129 Offs += ((int) Expr->IVal) - StackPtr;
130 CHECK (Offs >= 0); /* Cannot handle negative stack offsets */
136 ExprDesc* ED_MakeConstAbs (ExprDesc* Expr, long Value, type* Type)
137 /* Make Expr an absolute const with the given value and type. */
141 Expr->Flags = E_LOC_ABS | E_RTYPE_RVAL;
150 ExprDesc* ED_MakeConstAbsInt (ExprDesc* Expr, long Value)
151 /* Make Expr a constant integer expression with the given value */
154 Expr->Type = type_int;
155 Expr->Flags = E_LOC_ABS | E_RTYPE_RVAL;
164 ExprDesc* ED_MakeRValExpr (ExprDesc* Expr)
165 /* Convert Expr into a rvalue which is in the primary register without an
170 Expr->Flags &= ~(E_MASK_LOC | E_MASK_RTYPE | E_NEED_TEST | E_CC_SET);
171 Expr->Flags |= (E_LOC_EXPR | E_RTYPE_RVAL);
173 Expr->IVal = 0; /* No offset */
180 ExprDesc* ED_MakeLValExpr (ExprDesc* Expr)
181 /* Convert Expr into a lvalue which is in the primary register without an
186 Expr->Flags &= ~(E_MASK_LOC | E_MASK_RTYPE | E_NEED_TEST | E_CC_SET);
187 Expr->Flags |= (E_LOC_EXPR | E_RTYPE_LVAL);
189 Expr->IVal = 0; /* No offset */
196 int ED_IsConst (const ExprDesc* Expr)
197 /* Return true if the expression denotes a constant of some sort. This can be a
198 * numeric constant, the address of a global variable (maybe with offset) or
202 return ED_IsRVal (Expr) && (Expr->Flags & E_LOC_CONST) != 0;
207 int ED_IsConstAbsInt (const ExprDesc* Expr)
208 /* Return true if the expression is a constant (numeric) integer. */
210 return (Expr->Flags & (E_MASK_LOC|E_MASK_RTYPE)) == (E_LOC_ABS|E_RTYPE_RVAL) &&
211 IsClassInt (Expr->Type);
216 int ED_IsNullPtr (const ExprDesc* Expr)
217 /* Return true if the given expression is a NULL pointer constant */
219 return (Expr->Flags & (E_MASK_LOC|E_MASK_RTYPE)) == (E_LOC_ABS|E_RTYPE_RVAL) &&
221 IsClassInt (Expr->Type);
226 int ED_IsBool (const ExprDesc* Expr)
227 /* Return true of the expression can be treated as a boolean, that is, it can
228 * be an operand to a compare operation.
231 /* Either ints, floats, or pointers can be used in a boolean context */
232 return IsClassInt (Expr->Type) ||
233 IsClassFloat (Expr->Type) ||
234 IsClassPtr (Expr->Type);
239 void PrintExprDesc (FILE* F, ExprDesc* E)
240 /* Print an ExprDesc */
245 fprintf (F, "Symbol: %s\n", E->Sym? E->Sym->Name : "(none)");
247 fprintf (F, "Type: ");
248 PrintType (F, E->Type);
249 fprintf (F, "\nRaw type: ");
250 PrintRawType (F, E->Type);
252 fprintf (F, "Type: (unknown)\n"
253 "Raw type: (unknown)\n");
255 fprintf (F, "IVal: 0x%08lX\n", E->IVal);
256 fprintf (F, "FVal: %f\n", E->FVal);
260 fprintf (F, "Flags: 0x%04X ", Flags);
261 if (Flags & E_LOC_ABS) {
262 fprintf (F, "%cE_LOC_ABS", Sep);
266 if (Flags & E_LOC_GLOBAL) {
267 fprintf (F, "%cE_LOC_GLOBAL", Sep);
268 Flags &= ~E_LOC_GLOBAL;
271 if (Flags & E_LOC_STATIC) {
272 fprintf (F, "%cE_LOC_STATIC", Sep);
273 Flags &= ~E_LOC_STATIC;
276 if (Flags & E_LOC_REGISTER) {
277 fprintf (F, "%cE_LOC_REGISTER", Sep);
278 Flags &= ~E_LOC_REGISTER;
281 if (Flags & E_LOC_STACK) {
282 fprintf (F, "%cE_LOC_STACK", Sep);
283 Flags &= ~E_LOC_STACK;
286 if (Flags & E_LOC_PRIMARY) {
287 fprintf (F, "%cE_LOC_PRIMARY", Sep);
288 Flags &= ~E_LOC_PRIMARY;
291 if (Flags & E_LOC_EXPR) {
292 fprintf (F, "%cE_LOC_EXPR", Sep);
293 Flags &= ~E_LOC_EXPR;
296 if (Flags & E_LOC_LITERAL) {
297 fprintf (F, "%cE_LOC_LITERAL", Sep);
298 Flags &= ~E_LOC_LITERAL;
301 if (Flags & E_RTYPE_LVAL) {
302 fprintf (F, "%cE_RTYPE_LVAL", Sep);
303 Flags &= ~E_RTYPE_LVAL;
306 if (Flags & E_NEED_TEST) {
307 fprintf (F, "%cE_NEED_TEST", Sep);
308 Flags &= ~E_NEED_TEST;
311 if (Flags & E_CC_SET) {
312 fprintf (F, "%cE_CC_SET", Sep);
317 fprintf (F, "%c,0x%04X", Sep, Flags);
323 fprintf (F, "\nName: 0x%08lX\n", E->Name);
328 type* ReplaceType (ExprDesc* Expr, const type* NewType)
329 /* Replace the type of Expr by a copy of Newtype and return the old type string */
331 type* OldType = Expr->Type;
332 Expr->Type = TypeDup (NewType);