void ObjReadData (FILE* F, ObjData* O)
/* Read object file data from the given file. The function expects the Name
* and Start fields to be valid. Header and basic data are read.
*/
{
unsigned long Count;
/* Seek to the start of the object file data */
fseek (F, O->Start, SEEK_SET);
/* Read the object file header */
ObjReadHeader (F, &O->Header, O->Name);
/* Read the string pool */
fseek (F, O->Start + O->Header.StrPoolOffs, SEEK_SET);
Count = ReadVar (F);
CollGrow (&O->Strings, Count);
while (Count--) {
CollAppend (&O->Strings, ReadStr (F));
}
/* Read the exports */
fseek (F, O->Start + O->Header.ExportOffs, SEEK_SET);
Count = ReadVar (F);
CollGrow (&O->Exports, Count);
while (Count--) {
unsigned char ConDes[CD_TYPE_COUNT];
/* Skip data until we get to the name */
unsigned Type = ReadVar (F);
(void) Read8 (F); /* AddrSize */
ReadData (F, ConDes, SYM_GET_CONDES_COUNT (Type));
/* Now this is what we actually need: The name of the export */
CollAppend (&O->Exports, CollAt (&O->Strings, ReadVar (F)));
/* Skip the export value */
if (SYM_IS_EXPR (Type)) {
/* Expression tree */
SkipExpr (F);
} else {
/* Literal value */
(void) Read32 (F);
}
/* Skip the size if necessary */
if (SYM_HAS_SIZE (Type)) {
(void) ReadVar (F);
}
/* Line info indices */
SkipLineInfoList (F);
SkipLineInfoList (F);
}
}
void ObjAdd (const char* Name)
/* Add an object file to the library */
{
struct stat StatBuf;
const char* Module;
ObjHeader H;
ObjData* O;
/* Open the object file */
FILE* Obj = fopen (Name, "rb");
if (Obj == 0) {
Error ("Could not open `%s': %s", Name, strerror (errno));
}
/* Get the modification time of the object file. There a race condition
* here, since we cannot use fileno() (non standard identifier in standard
* header file), and therefore not fstat. When using stat with the
* file name, there's a risk that the file was deleted and recreated
* while it was open. Since mtime and size are only used to check
* if a file has changed in the debugger, we will ignore this problem
* here.
*/
if (FileStat (Name, &StatBuf) != 0) {
Error ("Cannot stat object file `%s': %s", Name, strerror (errno));
}
/* Read and check the header */
ObjReadHeader (Obj, &H, Name);
/* Make a module name from the file name */
Module = GetModule (Name);
/* Check if we already have a module with this name */
O = FindObjData (Module);
if (O == 0) {
/* Not found, create a new entry */
O = NewObjData ();
} else {
/* Found - check the file modification times of the internal copy
* and the external one.
*/
if (difftime ((time_t)O->MTime, StatBuf.st_mtime) > 0.0) {
Warning ("Replacing module `%s' by older version in library `%s'",
O->Name, LibName);
}
/* Free data */
ClearObjData (O);
}
/* Initialize the object module data structure */
O->Name = xstrdup (Module);
O->Flags = OBJ_HAVEDATA;
O->MTime = StatBuf.st_mtime;
O->Start = 0;
/* Determine the file size. Note: Race condition here */
fseek (Obj, 0, SEEK_END);
O->Size = ftell (Obj);
/* Read the basic data from the object file */
ObjReadData (Obj, O);
/* Copy the complete object data to the library file and update the
* starting offset
*/
fseek (Obj, 0, SEEK_SET);
O->Start = LibCopyTo (Obj, O->Size);
/* Done, close the file (we read it only, so no error check) */
fclose (Obj);
}
void ObjAdd (FILE* Obj, const char* Name)
/* Add an object file to the module list */
{
/* Create a new structure for the object file data */
ObjData* O = NewObjData ();
/* The magic was already read and checked, so set it in the header */
O->Header.Magic = OBJ_MAGIC;
/* Read and check the header */
ObjReadHeader (Obj, &O->Header, Name);
/* Initialize the object module data structure */
O->Name = GetModule (Name);
/* Read the string pool from the object file */
ObjReadStrPool (Obj, O->Header.StrPoolOffs, O);
/* Read the files list from the object file */
ObjReadFiles (Obj, O->Header.FileOffs, O);
/* Read the imports list from the object file */
ObjReadImports (Obj, O->Header.ImportOffs, O);
/* Read the object file exports and insert them into the exports list */
ObjReadExports (Obj, O->Header.ExportOffs, O);
/* Read the object debug symbols from the object file */
ObjReadDbgSyms (Obj, O->Header.DbgSymOffs, O);
/* Read the line infos from the object file */
ObjReadLineInfos (Obj, O->Header.LineInfoOffs, O);
/* Read the assertions from the object file */
ObjReadAssertions (Obj, O->Header.AssertOffs, O);
/* Read the scope table from the object file */
ObjReadScopes (Obj, O->Header.ScopeOffs, O);
/* Read the segment list from the object file. This must be last, since
* the expressions stored in the code may reference segments or imported
* symbols.
*/
ObjReadSections (Obj, O->Header.SegOffs, O);
/* Mark this object file as needed */
O->Flags |= OBJ_REF;
/* Done, close the file (we read it only, so no error check) */
fclose (Obj);
/* Insert the imports and exports to the global lists */
InsertObjGlobals (O);
/* Insert the object into the list of all used object files */
InsertObjData (O);
/* All references to strings are now resolved, so we can delete the module
* string pool.
*/
FreeObjStrings (O);
}
