1 /*****************************************************************************/
5 /* Debug symbol handling for the ld65 linker */
9 /* (C) 1998-2003 Ullrich von Bassewitz */
10 /* Römerstrasse 52 */
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 /*****************************************************************************/
54 /*****************************************************************************/
56 /*****************************************************************************/
60 /* We will collect all debug symbols in the following array and remove
61 * duplicates before outputing them.
63 static DbgSym* DbgSymPool [256];
67 /*****************************************************************************/
69 /*****************************************************************************/
73 static DbgSym* NewDbgSym (unsigned char Type, ObjData* O)
74 /* Create a new DbgSym and return it */
77 DbgSym* D = xmalloc (sizeof (DbgSym));
79 /* Initialize the fields */
87 /* Return the new entry */
93 static DbgSym* GetDbgSym (DbgSym* D, long Val)
94 /* Check if we find the same debug symbol in the table. If we find it, return
95 * a pointer to the other occurrence, if we didn't find it, return NULL.
98 /* Create the hash. We hash over the symbol value */
99 unsigned Hash = ((Val >> 24) & 0xFF) ^
100 ((Val >> 16) & 0xFF) ^
101 ((Val >> 8) & 0xFF) ^
104 /* Check for this symbol */
105 DbgSym* Sym = DbgSymPool[Hash];
107 /* Is this symbol identical? */
108 if (Sym->Name == D->Name && EqualExpr (Sym->Expr, D->Expr)) {
117 /* This is the first symbol of it's kind */
123 static void InsertDbgSym (DbgSym* D, long Val)
124 /* Insert the symbol into the hashed symbol pool */
126 /* Create the hash. We hash over the symbol value */
127 unsigned Hash = ((Val >> 24) & 0xFF) ^
128 ((Val >> 16) & 0xFF) ^
129 ((Val >> 8) & 0xFF) ^
132 /* Insert the symbol */
133 D->Next = DbgSymPool [Hash];
134 DbgSymPool [Hash] = D;
139 DbgSym* ReadDbgSym (FILE* F, ObjData* O)
140 /* Read a debug symbol from a file, insert and return it */
148 /* Create a new debug symbol */
149 D = NewDbgSym (Type, O);
151 /* Read and assign the name */
152 D->Name = MakeGlobalStringId (O, ReadVar (F));
155 if (IS_EXP_EXPR (Type)) {
156 D->Expr = ReadExpr (F, O);
158 D->Expr = LiteralExpr (Read32 (F), O);
161 /* Last is the file position where the definition was done */
162 ReadFilePos (F, &D->Pos);
164 /* Return the new DbgSym */
170 long GetDbgSymVal (DbgSym* D)
171 /* Get the value of this symbol */
173 CHECK (D->Expr != 0);
174 return GetExprVal (D->Expr);
179 void PrintDbgSymLabels (ObjData* O, FILE* F)
180 /* Print the debug symbols in a VICE label file */
184 /* Walk through all debug symbols in this module */
185 for (I = 0; I < O->DbgSymCount; ++I) {
187 /* Get the next debug symbol */
188 DbgSym* D = O->DbgSyms [I];
190 /* Get the symbol value */
191 long Val = GetDbgSymVal (D);
193 /* Lookup this symbol in the table. If it is found in the table, it was
194 * already written to the file, so don't emit it twice. If it is not in
195 * the table, insert and output it.
197 if (GetDbgSym (D, Val) == 0) {
199 /* Emit the VICE label line */
200 fprintf (F, "al %06lX .%s\n", Val, GetString (D->Name));
202 /* Insert the symbol into the table */
203 InsertDbgSym (D, Val);