1 /*****************************************************************************/
5 /* Debug symbol handing for the ld65 linker */
9 /* (C) 1998 Ullrich von Bassewitz */
11 /* D-70597 Stuttgart */
12 /* EMail: uz@musoftware.de */
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 /*****************************************************************************/
53 /*****************************************************************************/
55 /*****************************************************************************/
59 /* We will collect all debug symbols in the following array and remove
60 * duplicates before outputing them.
62 static DbgSym* DbgSymPool [256];
66 /*****************************************************************************/
68 /*****************************************************************************/
72 static DbgSym* NewDbgSym (unsigned char Type, const char* Name, ObjData* O)
73 /* Create a new DbgSym and return it */
75 /* Get the length of the symbol name */
76 unsigned Len = strlen (Name);
79 DbgSym* D = xmalloc (sizeof (DbgSym) + Len);
81 /* Initialize the fields */
87 memcpy (D->Name, Name, Len);
90 /* Return the new entry */
96 static DbgSym* GetDbgSym (DbgSym* D, long Val)
97 /* Check if we find the same debug symbol in the table. If we find it, return
98 * a pointer to the other occurrence, if we didn't find it, return NULL.
101 /* Create the hash. We hash over the symbol value */
102 unsigned Hash = ((Val >> 24) & 0xFF) ^
103 ((Val >> 16) & 0xFF) ^
104 ((Val >> 8) & 0xFF) ^
107 /* Check for this symbol */
108 DbgSym* Sym = DbgSymPool [Hash];
110 /* Is this symbol identical? */
111 if (strcmp (Sym->Name, D->Name) == 0 && EqualExpr (Sym->Expr, D->Expr)) {
120 /* This is the first symbol of it's kind */
126 static void InsertDbgSym (DbgSym* D, long Val)
127 /* Insert the symbol into the hashed symbol pool */
129 /* Create the hash. We hash over the symbol value */
130 unsigned Hash = ((Val >> 24) & 0xFF) ^
131 ((Val >> 16) & 0xFF) ^
132 ((Val >> 8) & 0xFF) ^
135 /* Insert the symbol */
136 D->Next = DbgSymPool [Hash];
137 DbgSymPool [Hash] = D;
142 DbgSym* ReadDbgSym (FILE* F, ObjData* O)
143 /* Read a debug symbol from a file, insert and return it */
155 /* Create a new export */
156 D = NewDbgSym (Type, Name, O);
159 if (Type & EXP_EXPR) {
160 D->Expr = ReadExpr (F, O);
162 D->Expr = LiteralExpr (Read32 (F), O);
165 /* Last is the file position where the definition was done */
166 ReadFilePos (F, &D->Pos);
168 /* Return the new DbgSym */
174 long GetDbgSymVal (DbgSym* D)
175 /* Get the value of this symbol */
177 CHECK (D->Expr != 0);
178 return GetExprVal (D->Expr);
183 void PrintDbgSymLabels (ObjData* O, FILE* F)
184 /* Print the debug symbols in a VICE label file */
188 /* Walk through all debug symbols in this module */
189 for (I = 0; I < O->DbgSymCount; ++I) {
191 /* Get the next debug symbol */
192 DbgSym* D = O->DbgSyms [I];
194 /* Get the symbol value */
195 long Val = GetDbgSymVal (D);
197 /* Lookup this symbol in the table. If it is found in the table, it was
198 * already written to the file, so don't emit it twice. If it is not in
199 * the table, insert and output it.
201 if (GetDbgSym (D, Val) == 0) {
203 /* Emit the VICE label line */
204 fprintf (F, "al %06lX .%s\n", Val, D->Name);
206 /* Insert the symbol into the table */
207 InsertDbgSym (D, Val);