Reorganisation of the source tree

[ghc-hetmet.git] / rts / LinkerInternals.h

diff --git a/rts/LinkerInternals.h b/rts/LinkerInternals.h
new file mode 100644 (file)
index 0000000..07d6334
--- /dev/null
+++ b/rts/LinkerInternals.h
@@ -0,0 +1,110 @@
+/* -----------------------------------------------------------------------------
+ *
+ * (c) The GHC Team, 2000
+ *
+ * RTS Object Linker
+ *
+ * ---------------------------------------------------------------------------*/
+
+#ifndef LINKERINTERNALS_H
+#define LINKERINTERNALS_H
+
+typedef enum { OBJECT_LOADED, OBJECT_RESOLVED } OStatus;
+
+/* Indication of section kinds for loaded objects.  Needed by
+   the GC for deciding whether or not a pointer on the stack
+   is a code pointer.
+*/
+typedef 
+   enum { SECTIONKIND_CODE_OR_RODATA,
+          SECTIONKIND_RWDATA,
+          SECTIONKIND_OTHER,
+          SECTIONKIND_NOINFOAVAIL } 
+   SectionKind;
+
+typedef 
+   struct _Section { 
+      void* start; 
+      void* end; 
+      SectionKind kind;
+      struct _Section* next;
+   } 
+   Section;
+
+typedef 
+   struct _ProddableBlock {
+      void* start;
+      int   size;
+      struct _ProddableBlock* next;
+   }
+   ProddableBlock;
+
+/* Jump Islands are sniplets of machine code required for relative
+ * address relocations on the PowerPC.
+ */
+#ifdef powerpc_HOST_ARCH
+typedef struct {
+    short lis_r12, hi_addr;
+    short ori_r12_r12, lo_addr;
+    long mtctr_r12;
+    long bctr;
+} ppcJumpIsland;
+#endif
+
+/* Top-level structure for an object module.  One of these is allocated
+ * for each object file in use.
+ */
+typedef struct _ObjectCode {
+    OStatus    status;
+    char*      fileName;
+    int        fileSize;
+    char*      formatName;            /* eg "ELF32", "DLL", "COFF", etc. */
+
+    /* 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
+       object is removed from the system. */
+    char**     symbols;
+    int        n_symbols;
+
+    /* ptr to malloc'd lump of memory holding the obj file */
+    char*      image;
+
+#ifdef darwin_HOST_OS
+    /* record by how much image has been deliberately misaligned
+       after allocation, so that we can use realloc */
+    int        misalignment;
+#endif
+
+    /* The section-kind entries for this object module.  Linked
+       list. */
+    Section* sections;
+
+    /* A private hash table for local symbols. */
+    HashTable* lochash;
+    
+    /* Allow a chain of these things */
+    struct _ObjectCode * next;
+
+    /* SANITY CHECK ONLY: a list of the only memory regions which may
+       safely be prodded during relocation.  Any attempt to prod
+       outside one of these is an error in the linker. */
+    ProddableBlock* proddables;
+
+#ifdef ia64_HOST_ARCH
+    /* Procedure Linkage Table for this object */
+    void *plt;
+    unsigned int pltIndex;
+#endif
+
+#ifdef powerpc_HOST_ARCH
+    ppcJumpIsland   *jump_islands;
+    unsigned long   island_start_symbol;
+    unsigned long   n_islands;
+#endif
+
+} ObjectCode;
+
+extern ObjectCode *objects;
+
+#endif /* LINKERINTERNALS_H */