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 */
69 const char* ED_GetLabelName (const ExprDesc* Expr, long Offs)
70 /* Return the assembler label name of the given expression. Beware: This
71 * function may use a static buffer, so the name may get "lost" on the second
72 * call to the function.
77 /* Expr may have it's own offset, adjust Offs accordingly */
80 /* Generate a label depending on the location */
81 switch (ED_GetLoc (Expr)) {
84 /* Absolute: numeric address or const */
85 xsprintf (Buf, sizeof (Buf), "$%04X", (int)(Offs & 0xFFFF));
90 /* Global or static variable */
92 xsprintf (Buf, sizeof (Buf), "%s%+ld",
93 SymGetAsmName (Expr->Sym), Offs);
95 xsprintf (Buf, sizeof (Buf), "%s",
96 SymGetAsmName (Expr->Sym));
101 /* Register variable */
102 xsprintf (Buf, sizeof (Buf), "regbank+%u",
103 (unsigned)((Offs + Expr->Name) & 0xFFFFU));
107 /* Literal in the literal pool */
109 xsprintf (Buf, sizeof (Buf), "%s%+ld",
110 LocalLabelName (Expr->Name), Offs);
112 xsprintf (Buf, sizeof (Buf), "%s",
113 LocalLabelName (Expr->Name));
118 Internal ("Invalid location in ED_GetLabelName: 0x%04X", ED_GetLoc (Expr));
121 /* Return a pointer to the static buffer */
127 int ED_GetStackOffs (const ExprDesc* Expr, int Offs)
128 /* Get the stack offset of an address on the stack in Expr taking into account
129 * an additional offset in Offs.
132 PRECONDITION (ED_IsLocStack (Expr));
133 Offs += ((int) Expr->Val) - StackPtr;
134 CHECK (Offs >= 0); /* Cannot handle negative stack offsets */
140 ExprDesc* ED_MakeConstAbs (ExprDesc* Expr, long Value, type* Type)
141 /* Make Expr an absolute const with the given value and type. */
146 Expr->Flags = E_LOC_ABS | E_RTYPE_RVAL;
153 ExprDesc* ED_MakeConstAbsInt (ExprDesc* Expr, long Value)
154 /* Make Expr a constant integer expression with the given value */
157 Expr->Type = type_int;
159 Expr->Flags = E_LOC_ABS | E_RTYPE_RVAL;
166 ExprDesc* ED_MakeRValExpr (ExprDesc* Expr)
167 /* Convert Expr into a rvalue which is in the primary register without an
172 Expr->Val = 0; /* No offset */
173 Expr->Flags &= ~(E_MASK_LOC | E_MASK_RTYPE | E_NEED_TEST | E_CC_SET);
174 Expr->Flags |= (E_LOC_EXPR | E_RTYPE_RVAL);
181 ExprDesc* ED_MakeLValExpr (ExprDesc* Expr)
182 /* Convert Expr into a lvalue which is in the primary register without an
187 Expr->Val = 0; /* No offset */
188 Expr->Flags &= ~(E_MASK_LOC | E_MASK_RTYPE | E_NEED_TEST | E_CC_SET);
189 Expr->Flags |= (E_LOC_EXPR | E_RTYPE_LVAL);
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_IsConstAbs (const ExprDesc* Expr)
208 /* Return true if the expression denotes a constant absolute value. This can be
209 * a numeric constant, cast to any type.
212 return (Expr->Flags & (E_MASK_LOC|E_MASK_RTYPE)) == (E_LOC_ABS|E_RTYPE_RVAL);
217 int ED_IsConstAbsInt (const ExprDesc* Expr)
218 /* Return true if the expression is a constant (numeric) integer. */
220 return (Expr->Flags & (E_MASK_LOC|E_MASK_RTYPE)) == (E_LOC_ABS|E_RTYPE_RVAL) &&
221 IsClassInt (Expr->Type);
226 int ED_IsNullPtr (const ExprDesc* Expr)
227 /* Return true if the given expression is a NULL pointer constant */
229 return (Expr->Flags & (E_MASK_LOC|E_MASK_RTYPE)) == (E_LOC_ABS|E_RTYPE_RVAL) &&
231 IsClassInt (Expr->Type);
236 int ED_IsBool (const ExprDesc* Expr)
237 /* Return true of the expression can be treated as a boolean, that is, it can
238 * be an operand to a compare operation.
241 /* Either ints, floats, or pointers can be used in a boolean context */
242 return IsClassInt (Expr->Type) ||
243 IsClassFloat (Expr->Type) ||
244 IsClassPtr (Expr->Type);
249 void PrintExprDesc (FILE* F, ExprDesc* E)
250 /* Print an ExprDesc */
255 fprintf (F, "Symbol: %s\n", E->Sym? E->Sym->Name : "(none)");
257 fprintf (F, "Type: ");
258 PrintType (F, E->Type);
259 fprintf (F, "\nRaw type: ");
260 PrintRawType (F, E->Type);
262 fprintf (F, "Type: (unknown)\n"
263 "Raw type: (unknown)\n");
265 fprintf (F, "Value: 0x%08lX\n", E->Val);
269 fprintf (F, "Flags: 0x%04X ", Flags);
270 if (Flags & E_LOC_ABS) {
271 fprintf (F, "%cE_LOC_ABS", Sep);
275 if (Flags & E_LOC_GLOBAL) {
276 fprintf (F, "%cE_LOC_GLOBAL", Sep);
277 Flags &= ~E_LOC_GLOBAL;
280 if (Flags & E_LOC_STATIC) {
281 fprintf (F, "%cE_LOC_STATIC", Sep);
282 Flags &= ~E_LOC_STATIC;
285 if (Flags & E_LOC_REGISTER) {
286 fprintf (F, "%cE_LOC_REGISTER", Sep);
287 Flags &= ~E_LOC_REGISTER;
290 if (Flags & E_LOC_STACK) {
291 fprintf (F, "%cE_LOC_STACK", Sep);
292 Flags &= ~E_LOC_STACK;
295 if (Flags & E_LOC_PRIMARY) {
296 fprintf (F, "%cE_LOC_PRIMARY", Sep);
297 Flags &= ~E_LOC_PRIMARY;
300 if (Flags & E_LOC_EXPR) {
301 fprintf (F, "%cE_LOC_EXPR", Sep);
302 Flags &= ~E_LOC_EXPR;
305 if (Flags & E_LOC_LITERAL) {
306 fprintf (F, "%cE_LOC_LITERAL", Sep);
307 Flags &= ~E_LOC_LITERAL;
310 if (Flags & E_RTYPE_LVAL) {
311 fprintf (F, "%cE_RTYPE_LVAL", Sep);
312 Flags &= ~E_RTYPE_LVAL;
315 if (Flags & E_NEED_TEST) {
316 fprintf (F, "%cE_NEED_TEST", Sep);
317 Flags &= ~E_NEED_TEST;
320 if (Flags & E_CC_SET) {
321 fprintf (F, "%cE_CC_SET", Sep);
326 fprintf (F, "%c,0x%04X", Sep, Flags);
332 fprintf (F, "\nName: 0x%08lX\n", E->Name);
337 type* ReplaceType (ExprDesc* Expr, const type* NewType)
338 /* Replace the type of Expr by a copy of Newtype and return the old type string */
340 type* OldType = Expr->Type;
341 Expr->Type = TypeDup (NewType);