2nd try: remove lochash, it isn't needed (now)
[ghc.git] / rts / LinkerInternals.h
1 /* -----------------------------------------------------------------------------
2 *
3 * (c) The GHC Team, 2000
4 *
5 * RTS Object Linker
6 *
7 * ---------------------------------------------------------------------------*/
8
9 #ifndef LINKERINTERNALS_H
10 #define LINKERINTERNALS_H
11
12 typedef enum { OBJECT_LOADED, OBJECT_RESOLVED } OStatus;
13
14 /* Indication of section kinds for loaded objects. Needed by
15 the GC for deciding whether or not a pointer on the stack
16 is a code pointer.
17 */
18 typedef
19 enum { SECTIONKIND_CODE_OR_RODATA,
20 SECTIONKIND_RWDATA,
21 SECTIONKIND_OTHER,
22 SECTIONKIND_NOINFOAVAIL }
23 SectionKind;
24
25 typedef
26 struct _Section {
27 void* start;
28 void* end;
29 SectionKind kind;
30 struct _Section* next;
31 }
32 Section;
33
34 typedef
35 struct _ProddableBlock {
36 void* start;
37 int size;
38 struct _ProddableBlock* next;
39 }
40 ProddableBlock;
41
42 /* Jump Islands are sniplets of machine code required for relative
43 * address relocations on the PowerPC.
44 */
45 typedef struct {
46 #ifdef powerpc_HOST_ARCH
47 struct {
48 short lis_r12, hi_addr;
49 short ori_r12_r12, lo_addr;
50 long mtctr_r12;
51 long bctr;
52 } jumpIsland;
53 #elif x86_64_TARGET_ARCH
54 uint64_t addr;
55 uint8_t jumpIsland[6];
56 #endif
57 } SymbolExtra;
58
59 /* Top-level structure for an object module. One of these is allocated
60 * for each object file in use.
61 */
62 typedef struct _ObjectCode {
63 OStatus status;
64 char* fileName;
65 int fileSize;
66 char* formatName; /* eg "ELF32", "DLL", "COFF", etc. */
67
68 /* An array containing ptrs to all the symbol names copied from
69 this object into the global symbol hash table. This is so that
70 we know which parts of the latter mapping to nuke when this
71 object is removed from the system. */
72 char** symbols;
73 int n_symbols;
74
75 /* ptr to malloc'd lump of memory holding the obj file */
76 char* image;
77
78 #ifdef darwin_HOST_OS
79 /* record by how much image has been deliberately misaligned
80 after allocation, so that we can use realloc */
81 int misalignment;
82 #endif
83
84 /* The section-kind entries for this object module. Linked
85 list. */
86 Section* sections;
87
88 /* Allow a chain of these things */
89 struct _ObjectCode * next;
90
91 /* SANITY CHECK ONLY: a list of the only memory regions which may
92 safely be prodded during relocation. Any attempt to prod
93 outside one of these is an error in the linker. */
94 ProddableBlock* proddables;
95
96 #ifdef ia64_HOST_ARCH
97 /* Procedure Linkage Table for this object */
98 void *plt;
99 unsigned int pltIndex;
100 #endif
101
102 #if powerpc_HOST_ARCH || x86_64_HOST_ARCH
103 SymbolExtra *symbol_extras;
104 unsigned long first_symbol_extra;
105 unsigned long n_symbol_extras;
106 #endif
107
108 } ObjectCode;
109
110 extern ObjectCode *objects;
111
112 #endif /* LINKERINTERNALS_H */