1 /*****************************************************************************/
5 /* Library data structures and helpers for the ld65 linker */
9 /* (C) 1998-2000 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 /*****************************************************************************/
58 /*****************************************************************************/
60 /*****************************************************************************/
66 static char* LibName = 0;
67 static unsigned ModuleCount = 0;
68 static ObjData** Index = 0;
72 /*****************************************************************************/
73 /* Reading file data structures */
74 /*****************************************************************************/
78 static void LibReadObjHeader (ObjData* O)
79 /* Read the header of the object file checking the signature */
81 O->Header.Magic = Read32 (Lib);
82 if (O->Header.Magic != OBJ_MAGIC) {
83 Error ("Object file `%s' in library `%s' is invalid", O->Name, LibName);
85 O->Header.Version = Read16 (Lib);
86 if (O->Header.Version != OBJ_VERSION) {
87 Error ("Object file `%s' in library `%s' has wrong version",
90 O->Header.Flags = Read16 (Lib);
91 O->Header.OptionOffs = Read32 (Lib);
92 O->Header.OptionSize = Read32 (Lib);
93 O->Header.FileOffs = Read32 (Lib);
94 O->Header.FileSize = Read32 (Lib);
95 O->Header.SegOffs = Read32 (Lib);
96 O->Header.SegSize = Read32 (Lib);
97 O->Header.ImportOffs = Read32 (Lib);
98 O->Header.ImportSize = Read32 (Lib);
99 O->Header.ExportOffs = Read32 (Lib);
100 O->Header.ExportSize = Read32 (Lib);
101 O->Header.DbgSymOffs = Read32 (Lib);
102 O->Header.DbgSymSize = Read32 (Lib);
107 static ObjData* ReadIndexEntry (void)
108 /* Read one entry in the index */
112 /* Create a new entry and insert it into the list */
113 ObjData* O = NewObjData ();
115 /* Module name/flags/MTime/Start/Size */
116 O->Name = ReadStr (Lib);
117 O->Flags = Read16 (Lib);
118 Read32 (Lib); /* Skip MTime */
119 O->Start = Read32 (Lib);
120 Read32 (Lib); /* Skip Size */
122 /* Skip the export size, then read the exports */
124 O->ExportCount = ReadVar (Lib);
125 O->Exports = xmalloc (O->ExportCount * sizeof (Export*));
126 for (I = 0; I < O->ExportCount; ++I) {
127 O->Exports [I] = ReadExport (Lib, O);
130 /* Skip the import size, then read the imports */
132 O->ImportCount = ReadVar (Lib);
133 O->Imports = xmalloc (O->ImportCount * sizeof (Import*));
134 for (I = 0; I < O->ImportCount; ++I) {
135 O->Imports [I] = ReadImport (Lib, O);
144 static void ReadIndex (void)
145 /* Read the index of a library file */
149 /* Read the object file count and allocate memory */
150 ModuleCount = Read16 (Lib);
151 Index = xmalloc (ModuleCount * sizeof (ObjData*));
153 /* Read all entries in the index */
154 for (I = 0; I < ModuleCount; ++I) {
155 Index [I] = ReadIndexEntry ();
161 /*****************************************************************************/
162 /* High level stuff */
163 /*****************************************************************************/
167 static void LibCheckExports (ObjData* O)
168 /* Check if the exports from this file can satisfy any import requests. If so,
169 * insert the imports and exports from this file and mark the file as added.
174 /* Check all exports */
175 for (I = 0; I < O->ExportCount; ++I) {
176 if (IsUnresolved (O->Exports [I]->Name)) {
177 /* We need this module */
183 /* If we need this module, insert the imports and exports */
184 if (O->Flags & OBJ_REF) {
185 /* Insert the exports */
186 for (I = 0; I < O->ExportCount; ++I) {
187 InsertExport (O->Exports [I]);
189 /* Insert the imports */
190 for (I = 0; I < O->ImportCount; ++I) {
191 InsertImport (O->Imports [I]);
198 void LibAdd (FILE* F, const char* Name)
199 /* Add files from the library to the list if there are references that could
207 /* Store the parameters, so they're visible for other routines */
209 LibName = xstrdup (Name);
211 /* Read the remaining header fields (magic is already read) */
212 Header.Magic = LIB_MAGIC;
213 Header.Version = Read16 (Lib);
214 if (Header.Version != LIB_VERSION) {
215 Error ("Wrong data version in `%s'", Name);
217 Header.Flags = Read16 (Lib);
218 Header.IndexOffs = Read32 (Lib);
220 /* Seek to the index position and read the index */
221 fseek (Lib, Header.IndexOffs, SEEK_SET);
224 /* Walk through all library modules and check for each module if there
225 * are unresolved externals in existing modules that may be resolved
226 * by adding the module. Repeat this step until no more object files
231 for (I = 0; I < ModuleCount; ++I) {
232 ObjData* O = Index [I];
233 if ((O->Flags & OBJ_REF) == 0) {
235 if (O->Flags & OBJ_REF) {
236 /* The routine added the file */
243 /* Add the files list and sections for all requested modules */
244 for (I = 0; I < ModuleCount; ++I) {
245 ObjData* O = Index [I];
246 if (O->Flags & OBJ_REF) {
248 /* Seek to the start of the object file and read the header */
249 fseek (Lib, O->Start, SEEK_SET);
250 LibReadObjHeader (O);
252 /* Seek to the start of the files list and read the files list */
253 fseek (Lib, O->Start + O->Header.FileOffs, SEEK_SET);
254 ObjReadFiles (Lib, O);
256 /* Seek to the start of the segment list and read the segments */
257 fseek (Lib, O->Start + O->Header.SegOffs, SEEK_SET);
258 ObjReadSections (Lib, O);
260 /* Seek to the start of the debug info and read the debug info */
261 fseek (Lib, O->Start + O->Header.DbgSymOffs, SEEK_SET);
262 ObjReadDbgSyms (Lib, O);
264 /* We have the data now */
265 O->Flags |= OBJ_HAVEDATA;
269 /* Add a pointer to the library name */
270 O->LibName = LibName;
273 /* Done. Close the file, release allocated memory */