New member "archiveMemberName" for struct _ObjectCode

struct _ObjectCode should be able to retain the name of archive members.
Though currently the only use of those names are for debugging outputs.

rts/Linker.c

@@ -119,7 +119,8 @@ static /*Str*/HashTable *stablehash;
 ObjectCode *objects = NULL;	/* initially empty */
 
 static HsInt loadOc( ObjectCode* oc );
-static ObjectCode* mkOc( char *path, char *image, int imageSize
+static ObjectCode* mkOc( char *path, char *image, int imageSize,
+                         char *archiveMemberName
 #ifndef USE_MMAP
 #ifdef darwin_HOST_OS
                        , int misalignment
@@ -1602,7 +1603,8 @@ mmap_again:
 #endif // USE_MMAP
 
 static ObjectCode*
-mkOc( char *path, char *image, int imageSize
+mkOc( char *path, char *image, int imageSize,
+      char *archiveMemberName
 #ifndef USE_MMAP
 #ifdef darwin_HOST_OS
     , int misalignment
@@ -1626,10 +1628,17 @@ mkOc( char *path, char *image, int imageSize
 
    oc->image = image;
    /* sigh, strdup() isn't a POSIX function, so do it the long way */
-   /* XXX What should this be for an archive? */
    oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
    strcpy(oc->fileName, path);
 
+   if (archiveMemberName) {
+       oc->archiveMemberName = stgMallocBytes( strlen(archiveMemberName)+1, "loadObj" );
+       strcpy(oc->archiveMemberName, archiveMemberName);
+   }
+   else {
+       oc->archiveMemberName = NULL;
+   }
+
    oc->fileSize          = imageSize;
    oc->symbols           = NULL;
    oc->sections          = NULL;
@@ -1739,6 +1748,8 @@ loadArchive( char *path )
        }
 
        if (isObject) {
+           char *archiveMemberName;
+
            /* We can't mmap from the archive directly, as object
               files need to be 8-byte aligned but files in .ar
               archives are 2-byte aligned, and if we malloc the
@@ -1749,13 +1760,20 @@ loadArchive( char *path )
            n = fread ( image, 1, imageSize, f );
            if (n != imageSize)
                barf("loadObj: error whilst reading `%s'", path);
-           oc = mkOc(path, image, imageSize
+
+           archiveMemberName = stgMallocBytes(strlen(path) + fileNameSize + 3, "loadArchive(file)");
+           sprintf(archiveMemberName, "%s(%.*s)", path, (int)fileNameSize, file);
+
+           oc = mkOc(path, image, imageSize, archiveMemberName
 #ifndef USE_MMAP
 #ifdef darwin_HOST_OS
                     , 0
 #endif
 #endif
                     );
+
+           stgFree(archiveMemberName);
+
            if (0 == loadOc(oc)) {
                stgFree(file);
                return 0;
@@ -1899,7 +1917,7 @@ loadObj( char *path )
    fclose(f);
 #endif /* USE_MMAP */
 
-   oc = mkOc(path, image, fileSize
+   oc = mkOc(path, image, fileSize, NULL
 #ifndef USE_MMAP
 #ifdef darwin_HOST_OS
             , misalignment
@@ -2004,6 +2022,7 @@ HsInt
 unloadObj( char *path )
 {
     ObjectCode *oc, *prev;
+    HsBool unloadedAnyObj = HS_BOOL_FALSE;
 
     ASSERT(symhash != NULL);
     ASSERT(objects != NULL);
@@ -2043,12 +2062,20 @@ unloadObj( char *path )
 	    stgFree(oc->symbols);
 	    stgFree(oc->sections);
 	    stgFree(oc);
-	    return 1;
+
+            /* This could be a member of an archive so continue
+             * unloading other members. */
+            unloadedAnyObj = HS_BOOL_TRUE;
 	}
     }
 
+    if (unloadedAnyObj) {
+        return 1;
+    }
+    else {
         errorBelch("unloadObj: can't find `%s' to unload", path);
         return 0;
+    }
 }
 
 /* -----------------------------------------------------------------------------
@@ -4631,7 +4658,9 @@ static int relocateSection(
 		              "scattered relocation entry: "
                               "object file %s; entry type %ld; "
                               "address %#lx\n", 
-                              oc->fileName, scat->r_type, scat->r_address);
+                              OC_INFORMATIVE_FILENAME(oc),
+                              scat->r_type,
+                              scat->r_address);
                         return 0;
                      }
 
@@ -4668,7 +4697,9 @@ static int relocateSection(
             	         "with this r_length tag: "
                          "object file %s; entry type %ld; "
                          "r_length tag %ld; address %#lx\n", 
-                         oc->fileName, scat->r_type, scat->r_length,
+                         OC_INFORMATIVE_FILENAME(oc),
+                         scat->r_type,
+                         scat->r_length,
                          scat->r_address);
                     return 0;
 		}
@@ -4678,7 +4709,9 @@ static int relocateSection(
 	        barf("Don't know how to handle *PC-relative* Mach-O "
 	             "scattered relocation entry: "
                      "object file %s; entry type %ld; address %#lx\n", 
-                     oc->fileName, scat->r_type, scat->r_address);
+                     OC_INFORMATIVE_FILENAME(oc),
+                     scat->r_type,
+                     scat->r_address);
                return 0;
 	    }
 
@@ -4733,7 +4766,9 @@ static int relocateSection(
                     barf("Can't handle this Mach-O relocation entry "
 		         "(not scattered): "
                          "object file %s; entry type %ld; address %#lx\n",
-                         oc->fileName, reloc->r_type, reloc->r_address);
+                         OC_INFORMATIVE_FILENAME(oc),
+                         reloc->r_type,
+                         reloc->r_address);
                     return 0;
                 }
 
@@ -4807,20 +4842,32 @@ static int relocateSection(
 		}
 		else if(reloc->r_type == PPC_RELOC_BR24)
 		{
-                    if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
+                    if((word & 0x03) != 0)
+                        barf("%s: unconditional relative branch with a displacement "
+                             "which isn't a multiple of 4 bytes: %#lx",
+                             OC_INFORMATIVE_FILENAME(oc),
+                             word);
+
+                    if((word & 0xFE000000) != 0xFE000000 &&
+                       (word & 0xFE000000) != 0x00000000)
                     {
                         // The branch offset is too large.
                         // Therefore, we try to use a jump island.
                         if(jumpIsland == 0)
                         {
-                            barf("unconditional relative branch out of range: "
-                                 "no jump island available");
+                            barf("%s: unconditional relative branch out of range: "
+                                 "no jump island available: %#lx",
+                                 OC_INFORMATIVE_FILENAME(oc),
+                                 word);
                         }
                         
                         word = offsetToJumpIsland;
-                        if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
-                            barf("unconditional relative branch out of range: "
-                                 "jump island out of range");
+                        if((word & 0xFE000000) != 0xFE000000 &&
+                           (word & 0xFE000000) != 0x00000000)
+                            barf("%s: unconditional relative branch out of range: "
+                                 "jump island out of range: %#lx",
+                                 OC_INFORMATIVE_FILENAME(oc),
+                                 word);
                     }
 		    *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
 		    continue;
@@ -4833,7 +4880,9 @@ static int relocateSection(
                       "with this r_length tag: "
                       "object file %s; entry type %ld; "
                       "r_length tag %ld; address %#lx\n",
-                      oc->fileName, reloc->r_type, reloc->r_length,
+                      OC_INFORMATIVE_FILENAME(oc),
+                      reloc->r_type,
+                      reloc->r_length,
                       reloc->r_address);
 	         return 0;
 	    }

rts/LinkerInternals.h

@@ -65,6 +65,11 @@ typedef struct _ObjectCode {
     int        fileSize;
     char*      formatName;            /* eg "ELF32", "DLL", "COFF", etc. */
 
+    /* If this object is a member of an archive, archiveMemberName is
+     * like "libarchive.a(object.o)". Otherwise it's NULL.
+     */
+    char*      archiveMemberName;
+
     /* An array containing ptrs to all the symbol names copied from
        this object into the global symbol hash table.  This is so that
        we know which parts of the latter mapping to nuke when this
@@ -107,6 +112,12 @@ typedef struct _ObjectCode {
 
 } ObjectCode;
 
+#define OC_INFORMATIVE_FILENAME(OC)             \
+    ( (OC)->archiveMemberName ?                 \
+      (OC)->archiveMemberName :                 \
+      (OC)->fileName                            \
+    )
+
 extern ObjectCode *objects;
 
 void exitLinker( void );