Libc-1044.40.1.tar.gz

[apple/libc.git] / sys / crt_externs.c

diff --git a/sys/crt_externs.c b/sys/crt_externs.c
index c1c4546b7a3d845244bb963b4a0a43f689b44e11..a78524ff1c0cfd865128735a2a3776a1bd310d42 100644 (file)
--- a/sys/crt_externs.c
+++ b/sys/crt_externs.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1999-2007 Apple Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
@@ -29,70 +29,96 @@
 
 #if defined(__DYNAMIC__)
 #include "mach-o/dyld.h" /* defines _dyld_lookup_and_bind() */
-#define STRINGIFY(a) # a
 #define DECLARE_VAR(var, type)                                 \
         static type * var ## _pointer = 0
 #define DECLARE_PROGNAME(var, type)                            \
         static type * var ## _pointer = 0;                     \
         static type _priv_ ## var = 0
-#define SETUP_VAR(var)                                         \
-    if ( var ## _pointer == 0) {                               \
-        _dyld_lookup_and_bind( STRINGIFY(_ ## var),            \
-                (unsigned long *) & var ## _pointer, 0);       \
-    }
-#define SETUP_PROGNAME(var)                                    \
-    if ( var ## _pointer == 0) {                               \
-       if(NSIsSymbolNameDefined( STRINGIFY(_ ## var) ))        \
-           _dyld_lookup_and_bind( STRINGIFY(_ ## var),         \
-                (unsigned long *) & var ## _pointer, 0);       \
-       else {                                                  \
-           char *progname = _dyld_get_image_name(0);           \
-           if(_priv_ ## var = strrchr(progname, '/'))          \
-               _priv_ ## var ++;                               \
-           else                                                \
-               _priv_ ## var = progname;                       \
-           var ## _pointer = & _priv_ ## var;                  \
-       }                                                       \
-    }
 #define USE_VAR(var) (var ## _pointer)
 #else
 #define DECLARE_VAR(var, type) extern type var
 #define DECLARE_PROGNAME(var, type) DECLARE_VAR(var, type)
-#define SETUP_VAR(var)
-#define SETUP_PROGNAME(var) SETUP_VAR(var)
 #define USE_VAR(var) (& var)
 #endif
 
+DECLARE_VAR(NXArgv, char **);
+DECLARE_VAR(NXArgc, int);
+DECLARE_VAR(environ, char **);
+DECLARE_VAR(_mh_execute_header, struct mach_header);
+DECLARE_PROGNAME(__progname, char *);
+
 char ***_NSGetArgv(void) {
-    DECLARE_VAR(NXArgv, char **);
-    SETUP_VAR(NXArgv);
     return(USE_VAR(NXArgv));
 }
 
 int *_NSGetArgc(void) {
-    DECLARE_VAR(NXArgc, int);
-    SETUP_VAR(NXArgc);
     return(USE_VAR(NXArgc));
 }
 
 char ***_NSGetEnviron(void) {
-    DECLARE_VAR(environ, char **);
-    SETUP_VAR(environ);
     return(USE_VAR(environ));
 }
 
 char **_NSGetProgname(void) {
-    DECLARE_PROGNAME(__progname, char *);
-    SETUP_PROGNAME(__progname);
     return(USE_VAR(__progname));
 }
 
 struct mach_header *_NSGetMachExecuteHeader(void) {
-    DECLARE_VAR(_mh_execute_header, struct mach_header);
-    SETUP_VAR(_mh_execute_header);
     return(USE_VAR(_mh_execute_header));
 }
 
+#if __DYNAMIC__
+struct ProgramVars
+{
+    void*      mh;
+    int*       NXArgcPtr;
+    char***    NXArgvPtr;
+    char***    environPtr;
+    char**     __prognamePtr;
+};
+
+
+#define SUPPORT_PRE_GM_10_5_EXECUTABLES (__ppc__ || __i386__)
+
+
+/*
+ * dyld calls libSystem_initializer() and passes it a ProgramVars struct
+ * containing pointers to the main executable's NXArg* global variables.
+ * libSystem_initializer() calls _libc_initializer() which calls
+ * _program_vars_init() passing the ProgramVars parameter.
+ */
+void __attribute__((visibility("hidden")))
+_program_vars_init(const struct ProgramVars* vars) {
+#if SUPPORT_PRE_GM_10_5_EXECUTABLES
+    // to support transitional 10.5 main executables that don't have extended __dyld section and instead call _NSSetProgramVars,  
+    // don't overwrite values set by _NSSetProgramVars() 
+    if ( NXArgv_pointer != NULL )
+       return;
+#endif
+    NXArgv_pointer             = vars->NXArgvPtr;
+    NXArgc_pointer             = vars->NXArgcPtr;
+    environ_pointer            = vars->environPtr;
+    __progname_pointer         = vars->__prognamePtr;
+    _mh_execute_header_pointer = vars->mh;
+}
+
+#if SUPPORT_PRE_GM_10_5_EXECUTABLES
+/*
+ * This is only called by main executables built with pre 10-5 GM crt1.10.5.o.  In those programs, 
+ * there is no extended __dyld section, dyld cannot tell _program_vars_init() where the real program
+ * variables are, so they get temp values and are set for real here.
+ */
+void _NSSetProgramVars(int* crt_argc, char*** crt_argv, char*** crt_environ, struct mach_header* crt_mh, char** crt_progname) {
+    NXArgv_pointer             = crt_argv;
+    NXArgc_pointer             = crt_argc;
+    environ_pointer            = crt_environ;
+    __progname_pointer         = crt_progname;
+    _mh_execute_header_pointer = crt_mh;
+}
+#endif 
+#endif /* __DYNAMIC__ */
+
+#if __ppc__
 /*
  * Fix for Radar bug 2200596 --
  * EH symbol definitions for gcc 2.7.2.x implementation of
@@ -122,3 +148,5 @@ void *__eh_value_gcc_272 = (void *)0;
 
 /* This is what egcs uses for its global data pointer */
 void *__eh_global_dataptr = (void *)0;
+#endif /* __ppc__ */
+