* macosx/tkMacOSXDebug.c: add TkMacOSXGetNamedDebugSymbol() function

	* macosx/tkMacOSXDebug.h: that finds unexported symbols in loaded
	libraries by manually walking their symbol table; only to be used for
	debugging purposes, may break unexpectedly in the future. Needed to get
	access to private_extern internal debugging functions in HIToolbox.

	* macosx/tkMacOSXCarbonEvents.c: fix debug event tracing on Tiger.
	* macosx/tkMacOSXMenu.c: add debug menu printing during reconfigure.
	* macosx/tkMacOSXInit.c: conditionalize 64bit-unsafe dyld code.
	* macosx/GNUmakefile: add 'wish8.x' symlink to SYMROOT.

	* macosx/Wish.xcode/project.pbxproj:     fix copy to tktest resource
	* macosx/Wish.xcodeproj/project.pbxproj: fork when zerolinked.

	* macosx/Wish.xcode/default.pbxuser:     add widget demo as argument to
	* macosx/Wish.xcodeproj/default.pbxuser: executables (on by default).

	* unix/configure:    add caching, use AC_CACHE_CHECK instead of
	* unix/configure.in: AC_CACHE_VAL where possible, consistent message
	* unix/tcl.m4:       quoting, sync relevant tclconfig/tcl.m4 changes and
	gratuitous formatting differences, fix SC_CONFIG_MANPAGES with default
	argument, Darwin improvements to SC_LOAD_*CONFIG.

1 files changed, 133 insertions, 1 deletions

diff --git a/macosx/tkMacOSXDebug.c b/macosx/tkMacOSXDebug.c
index 9997886..61f8418 100644
--- a/macosx/tkMacOSXDebug.c
+++ b/macosx/tkMacOSXDebug.c
@@ -50,13 +50,17 @@
  *      software in accordance with the terms specified in this
  *      license.
  *
- * RCS: @(#) $Id: tkMacOSXDebug.c,v 1.6 2005/11/27 02:36:14 das Exp $
+ * RCS: @(#) $Id: tkMacOSXDebug.c,v 1.7 2006/01/10 05:37:51 das Exp $
  */
 
+#include "tkMacOSXInt.h"
 #include "tkMacOSXDebug.h"
 
 #ifdef TK_MAC_DEBUG
 
+#include <mach-o/dyld.h>
+#include <mach-o/nlist.h>
+
 typedef struct {
  EventKind kind;
  char     * name;
@@ -447,5 +451,133 @@ MouseTrackingResultToAscii(MouseTrackingResult r, char * buf)
     sprintf(buf, "Unknown mouse tracking result : %d", r);
     return buf;
 }
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TkMacOSXGetNamedDebugSymbol --
+ *
+ *
+ *	  Dynamically acquire address of a named symbol from a loaded
+ *	  dynamic library, so that we can use API that may not be
+ *	  available on all OS versions.
+ *	  For debugging purposes, if we cannot find the symbol with the
+ *	  usual dynamic library APIs, we manually walk the symbol table
+ *	  of the loaded library. This allows access to unexported
+ *	  symbols such as private_extern internal debugging functions.
+ *	  If module is NULL or the empty string, search all loaded
+ *	  libraries (could be very expensive and should be avoided).
+ *
+ *	  THIS FUCTION IS ONLY TO BE USED FOR DEBUGGING PURPOSES, IT MAY
+ *	  BREAK UNEXPECTEDLY IN THE FUTURE !
+ *	 
+ * Results:
+ *	  Address of given symbol or NULL if unavailable.
+ *
+ * Side effects:
+ *	  None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+MODULE_SCOPE void *
+TkMacOSXGetNamedDebugSymbol(const char* module, const char* symbol)
+{
+    void* addr = TkMacOSXGetNamedSymbol(module, symbol);
+#ifndef __LP64__
+    if (!addr) {
+	const struct mach_header *mh = NULL;
+	uint32_t i, n = _dyld_image_count();
+
+	for (i = 0; i < n; i++) {
+	    if (module && *module) {
+		/* Find image with given module name */
+		char *name;
+		const char *path = _dyld_get_image_name(i);
+
+		if (!path) {
+		    continue;
+		}
+		name = strrchr(path, '/') + 1;
+		if (strncmp(name, module, strlen(name)) != 0) {
+		    continue;
+		}
+	    }
+	    mh = _dyld_get_image_header(i);
+	    if (mh) {
+		struct load_command *lc;
+		struct symtab_command *st = NULL;
+		struct segment_command *sg = NULL;
+		uint32_t j, m, nsect = 0, txtsectx = 0;
+		
+		lc = (struct load_command*)((char *) mh +
+			sizeof(struct mach_header));
+		m = mh->ncmds;
+		for (j = 0; j < m; j++) {
+		    /* Find symbol table and index of __text section */
+		    if (lc->cmd == LC_SEGMENT) {
+			/* Find last segment before symbol table */
+			sg = (struct segment_command*) lc;
+			if (!txtsectx) {
+			    /* Count total sections until (__TEXT, __text) */
+			    uint32_t k, ns = sg->nsects;
+			    
+			    if (strcmp(sg->segname, SEG_TEXT) == 0) {
+				struct section *s = (struct section *)(
+					(char *)sg +
+					sizeof(struct segment_command));
+				
+				for(k = 0; k < ns; k++) {
+				    if (strcmp(s->sectname, SECT_TEXT) == 0) {
+					txtsectx = nsect+k+1;
+					break;
+				    }
+				    s++;
+				}
+			    }
+			    nsect += ns;
+			}
+		    } else if (!st && lc->cmd == LC_SYMTAB) {
+			st = (struct symtab_command*) lc;
+			break;
+		    }
+		    lc = (struct load_command *)((char *) lc + lc->cmdsize);
+		}
+		if (st && sg && txtsectx) {
+		    intptr_t base, slide = _dyld_get_image_vmaddr_slide(i);
+		    char *strings;
+		    struct nlist *sym;
+		    uint32_t strsize = st->strsize;
+		    int32_t strx;
+		    
+		    /* Offset file positions by difference to actual position
+		       in memory of last segment before symbol table: */
+		    base = (intptr_t) sg->vmaddr + slide - sg->fileoff;
+		    strings = (char*)(base + st->stroff);
+		    sym = (struct nlist*)(base + st->symoff);
+		    m = st->nsyms;
+		    for (j = 0; j < m; j++) {
+			/* Find symbol with given name in __text section */
+			strx = sym->n_un.n_strx;
+			if ((sym->n_type & N_TYPE) == N_SECT &&
+				sym->n_sect == txtsectx &&
+				strx > 0 && strx < strsize &&
+				strcmp(strings + strx, symbol) == 0) {
+			    addr = (void*) sym->n_value + slide;
+			    break;
+			}
+			sym++;
+		    }
+		}
+	    }
+	    if (module && *module) {
+		/* If given a module name, only search corresponding image */
+		break;
+	    }
+	}
+    }
+#endif /* __LP64__ */
+    return addr;
+}
 
 #endif /* TK_MAC_DEBUG */