1 /*****************************************************************************/
5 /* .STRUCT/.UNION commands */
9 /* (C) 2003 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 /*****************************************************************************/
52 /*****************************************************************************/
54 /*****************************************************************************/
65 /*****************************************************************************/
67 /*****************************************************************************/
71 static long Member (long AllocSize)
72 /* Read one struct member and return its size */
76 /* A multiplicator may follow */
78 Multiplicator = ConstExpression ();
79 if (Multiplicator <= 0) {
80 ErrorSkip ("Range error");
83 AllocSize *= Multiplicator;
86 /* Check the size for a reasonable value */
87 if (AllocSize >= 0x10000) {
88 ErrorSkip ("Range error");
97 static long DoStructInternal (long Offs, unsigned Type)
98 /* Handle the .STRUCT command */
102 /* Outside of other structs, we need a name. Inside another struct or
103 * union, the struct may be anonymous, in which case no new lexical level
106 int Anon = (Tok != TOK_IDENT);
108 /* Enter a new scope, then skip the name */
109 SymEnterLevel (SVal, ST_STRUCT, ADDR_SIZE_ABS);
111 /* Start at zero offset in the new scope */
115 /* Test for end of line */
118 /* Read until end of struct */
119 while (Tok != TOK_ENDSTRUCT && Tok != TOK_ENDUNION && Tok != TOK_EOF) {
124 /* The format is "[identifier] storage-allocator [, multiplicator]" */
126 if (Tok == TOK_IDENT) {
127 /* We have an identifier, generate a symbol */
128 Sym = SymFind (CurrentScope, SVal, SYM_ALLOC_NEW);
130 /* Assign the symbol the offset of the current member */
131 SymDef (Sym, GenLiteralExpr (Offs), ADDR_SIZE_DEFAULT, SF_NONE);
133 /* Skip the member name */
137 /* Read storage allocators */
138 MemberSize = 0; /* In case of errors, use zero */
143 MemberSize = Member (1);
150 MemberSize = Member (2);
155 MemberSize = Member (3);
160 MemberSize = Member (4);
165 if (Tok == TOK_SEP) {
166 ErrorSkip ("Size is missing");
168 MemberSize = Member (1);
174 Struct = ParseScopedSymTable ();
176 ErrorSkip ("Unknown struct/union");
177 } else if (GetSymTabType (Struct) != ST_STRUCT) {
178 ErrorSkip ("Not a struct/union");
180 SymEntry* SizeSym = GetSizeOfScope (Struct);
181 if (!SymIsDef (SizeSym) || !SymIsConst (SizeSym, &MemberSize)) {
182 ErrorSkip ("Size of struct/union is unknown");
185 MemberSize = Member (MemberSize);
190 MemberSize = DoStructInternal (Offs, STRUCT);
195 MemberSize = DoStructInternal (Offs, UNION);
199 if (!CheckConditionals ()) {
200 /* Not a conditional directive */
201 ErrorSkip ("Invalid storage allocator in struct/union");
205 /* Assign the size to the member if it has a name */
207 DefSizeOfSymbol (Sym, MemberSize);
211 if (Type == STRUCT) {
217 if (MemberSize > Size) {
222 /* Expect end of line */
226 /* If this is not a anon struct, enter a special symbol named ".size"
227 * into the symbol table of the struct that holds the size of the
228 * struct. Since the symbol starts with a dot, it cannot be accessed
230 * Leave the struct scope level.
234 SymEntry* SizeSym = GetSizeOfScope (CurrentScope);
235 SymDef (SizeSym, GenLiteralExpr (Size), ADDR_SIZE_DEFAULT, SF_NONE);
237 /* Close the struct scope */
241 /* End of struct/union definition */
242 if (Type == STRUCT) {
243 Consume (TOK_ENDSTRUCT, "`.ENDSTRUCT' expected");
245 Consume (TOK_ENDUNION, "`.ENDUNION' expected");
248 /* Return the size of the struct */
254 long GetStructSize (SymTable* Struct)
255 /* Get the size of a struct or union */
257 SymEntry* Sym = SymFind (Struct, ".size", SYM_FIND_EXISTING);
259 Error ("Size of struct/union is unknown");
262 return GetSymVal (Sym);
269 /* Handle the .STRUCT command */
271 DoStructInternal (0, STRUCT);
277 /* Handle the .UNION command */
279 DoStructInternal (0, UNION);