erts: Refactor header of loaded beam code

to use a real C struct instead of array.

1 files changed, 57 insertions, 55 deletions

diff --git a/erts/emulator/beam/beam_load.h b/erts/emulator/beam/beam_load.h
index eedb5ee4cd..c86ac65521 100644
--- a/erts/emulator/beam/beam_load.h
+++ b/erts/emulator/beam/beam_load.h
@@ -24,7 +24,6 @@
 #include "beam_opcodes.h"
 #include "erl_process.h"
 
-int erts_is_module_native(BeamInstr* code);
 Eterm beam_make_current_old(Process *c_p, ErtsProcLocks c_p_locks,
 			    Eterm module);
 
@@ -61,63 +60,66 @@ extern BeamInstr* em_call_nif;
 
 /* Total code size in bytes */
 extern Uint erts_total_code_size;
-/*
- * Index into start of code chunks which contains additional information
- * about the loaded module.
- *
- * First number of functions.
- */
-
-#define MI_NUM_FUNCTIONS     0
-
-/*
- * The attributes retrieved by Mod:module_info(attributes).
- */
-
-#define MI_ATTR_PTR          1
-#define MI_ATTR_SIZE	     2
-#define MI_ATTR_SIZE_ON_HEAP 3
-
-/*
- * The compilation information retrieved by Mod:module_info(compile).
- */
-
-#define MI_COMPILE_PTR          4
-#define MI_COMPILE_SIZE         5
-#define MI_COMPILE_SIZE_ON_HEAP 6
-
-/*
- * Literal area (constant pool).
- */
-#define MI_LITERALS_START	7
-#define MI_LITERALS_END		8
-#define MI_LITERALS_OFF_HEAP	9
-
-/*
- * Pointer to the on_load function (or NULL if none).
- */
-#define MI_ON_LOAD_FUNCTION_PTR 10
-
-/*
- * Pointer to the line table (or NULL if none).
- */
-#define MI_LINE_TABLE 11
-
-/*
- * Pointer to the module MD5 sum (16 bytes)
- */
-#define MI_MD5_PTR 12
 
 /*
- * Start of function pointer table.  This table contains pointers to
- * all functions in the module plus an additional pointer just beyond
- * the end of the last function.
- *
- * The actual loaded code (for the first function) start just beyond
- * this table.
+ * Header of code chunks which contains additional information
+ * about the loaded module.
  */
-
-#define MI_FUNCTIONS         13
+typedef struct beam_code_header {
+    /*
+     * Number of functions.
+     */
+    UWord num_functions;
+
+    /*
+     * The attributes retrieved by Mod:module_info(attributes).
+     */
+    byte* attr_ptr;
+    UWord attr_size;
+    UWord attr_size_on_heap;
+
+    /*
+     * The compilation information retrieved by Mod:module_info(compile).
+     */
+    byte* compile_ptr;
+    UWord compile_size;
+    UWord compile_size_on_heap;
+
+    /*
+     * Literal area (constant pool).
+     */
+    Eterm* literals_start;
+    Eterm* literals_end;
+    struct erl_off_heap_header* literals_off_heap;
+
+    /*
+     * Pointer to the on_load function (or NULL if none).
+     */
+    BeamInstr* on_load_function_ptr;
+
+    /*
+     * Pointer to the line table (or NULL if none).
+     */
+    Eterm* line_table;
+
+    /*
+     * Pointer to the module MD5 sum (16 bytes)
+     */
+    byte* md5_ptr;
+
+    /*
+     * Start of function pointer table.  This table contains pointers to
+     * all functions in the module plus an additional pointer just beyond
+     * the end of the last function.
+     *
+     * The actual loaded code (for the first function) start just beyond
+     * this table.
+     */
+    BeamInstr* functions[1];
+
+}BeamCodeHeader;
+
+int erts_is_module_native(BeamCodeHeader* code);
 
 /*
  * Layout of the line table.