From 8a0ecec80d684468a4080f5852521b3ef0a60958 Mon Sep 17 00:00:00 2001
From: Simon Marlow <marlowsd@gmail.com>
Date: Mon, 4 Aug 2008 11:18:01 +0000
Subject: [PATCH] UNDO:  FIX #2375: remove oc->lochash completely, it
 apparently isn't used

---
 rts/Linker.c          |   35 +++++++++++++++++++++++++++++++++++
 rts/LinkerInternals.h |    3 +++
 2 files changed, 38 insertions(+)

diff --git a/rts/Linker.c b/rts/Linker.c
index 6c1446a..0d56912 100644
--- a/rts/Linker.c
+++ b/rts/Linker.c
@@ -1178,6 +1178,23 @@ lookupSymbol( char *lbl )
     }
 }
 
+static
+__attribute((unused))
+void *
+lookupLocalSymbol( ObjectCode* oc, char *lbl )
+{
+    void *val;
+    initLinker() ;
+    val = lookupStrHashTable(oc->lochash, lbl);
+
+    if (val == NULL) {
+        return NULL;
+    } else {
+	return val;
+    }
+}
+
+
 /* -----------------------------------------------------------------------------
  * Debugging aid: look in GHCi's object symbol tables for symbols
  * within DELTA bytes of the specified address, and show their names.
@@ -1199,7 +1216,11 @@ void ghci_enquire ( char* addr )
       for (i = 0; i < oc->n_symbols; i++) {
          sym = oc->symbols[i];
          if (sym == NULL) continue;
+         // debugBelch("enquire %p %p\n", sym, oc->lochash);
          a = NULL;
+         if (oc->lochash != NULL) {
+            a = lookupStrHashTable(oc->lochash, sym);
+	 }
          if (a == NULL) {
             a = lookupStrHashTable(symhash, sym);
 	 }
@@ -1284,6 +1305,7 @@ loadObj( char *path )
    oc->fileSize          = st.st_size;
    oc->symbols           = NULL;
    oc->sections          = NULL;
+   oc->lochash           = allocStrHashTable();
    oc->proddables        = NULL;
 
    /* chain it onto the list of objects */
@@ -1492,6 +1514,9 @@ unloadObj( char *path )
 	    stgFree(oc->fileName);
 	    stgFree(oc->symbols);
 	    stgFree(oc->sections);
+	    /* The local hash table should have been freed at the end
+               of the ocResolve_ call on it. */
+            ASSERT(oc->lochash == NULL);
 	    stgFree(oc);
 	    return 1;
 	}
@@ -3605,6 +3630,10 @@ ocResolve_ELF ( ObjectCode* oc )
       }
    }
 
+   /* Free the local symbol table; we won't need it again. */
+   freeHashTable(oc->lochash, NULL);
+   oc->lochash = NULL;
+
 #if defined(powerpc_HOST_ARCH)
    ocFlushInstructionCache( oc );
 #endif
@@ -3883,6 +3912,8 @@ static int resolveImports(
 	if((symbol->n_type & N_TYPE) == N_UNDF
 	    && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
 	    addr = (void*) (symbol->n_value);
+	else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
+	    ;
 	else
 	    addr = lookupSymbol(nm);
 	if(!addr)
@@ -4529,6 +4560,10 @@ static int ocResolve_MachO(ObjectCode* oc)
 	    return 0;
     }
 
+    /* Free the local symbol table; we won't need it again. */
+    freeHashTable(oc->lochash, NULL);
+    oc->lochash = NULL;
+
 #if defined (powerpc_HOST_ARCH)
     ocFlushInstructionCache( oc );
 #endif
diff --git a/rts/LinkerInternals.h b/rts/LinkerInternals.h
index 561a224..f081e62 100644
--- a/rts/LinkerInternals.h
+++ b/rts/LinkerInternals.h
@@ -85,6 +85,9 @@ typedef struct _ObjectCode {
        list. */
     Section* sections;
 
+    /* A private hash table for local symbols. */
+    HashTable* lochash;
+    
     /* Allow a chain of these things */
     struct _ObjectCode * next;
 
-- 
1.7.10.4