First cut at pruning things/updating things.

Remove a bunch of code that Google stopped using/maintaining rather than trying
to update it it. Some would be hard to update, some actually has system provided
replacements; others are patterns that just don't seem as common now.

Prune out the code related to macOS <= 10.5, start pruning some of the really
old iOS support also.

Get the projects mostly limping again with modern Xcodes so tests can be run.

If someone ends up on this commit via history for something they still find
as useful, feel free to do a pull request to bring the snippet of code back to
life and update it for current SDKs.

1 files changed, 2 insertions, 92 deletions

diff --git a/Foundation/GTMStackTrace.m b/Foundation/GTMStackTrace.m
index 3e34ed0..4470a11 100644
--- a/Foundation/GTMStackTrace.m
+++ b/Foundation/GTMStackTrace.m
@@ -19,8 +19,9 @@
 #include <stdlib.h>
 #include <dlfcn.h>
 #include <mach-o/nlist.h>
+#include <objc/runtime.h>
+
 #include "GTMStackTrace.h"
-#include "GTMObjC2Runtime.h"
 
 struct GTMClassDescription {
   const char *class_name;
@@ -202,73 +203,10 @@ static NSString *GTMStackTraceFromAddressDescriptors(struct GTMAddressDescriptor
 
 #pragma mark Public functions
 
-#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5
-// Before 10.5, we have to do this ourselves.  10.5 adds
-// +[NSThread callStackReturnAddresses].
-
-// Structure representing a small portion of a stack, starting from the saved
-// frame pointer, and continuing through the saved program counter.
-struct GTMStackFrame {
-  void *saved_fp;
-#if defined (__ppc__) || defined(__ppc64__)
-  void *padding;
-#endif
-  void *saved_pc;
-};
-
-// __builtin_frame_address(0) is a gcc builtin that returns a pointer to the
-// current frame pointer.  We then use the frame pointer to walk the stack
-// picking off program counters and other saved frame pointers.  This works
-// great on i386, but PPC requires a little more work because the PC (or link
-// register) isn't always stored on the stack.
-//
-NSUInteger GTMGetStackProgramCounters(void *outPcs[], NSUInteger count) {
-  if (!outPcs || (count < 1)) return 0;
-
-  struct GTMStackFrame *fp;
-#if defined (__ppc__) || defined(__ppc64__)
-  outPcs[0] = __builtin_return_address(0);
-  fp = (struct GTMStackFrame *)__builtin_frame_address(1);
-#elif defined (__i386__) || defined(__x86_64__)
-  fp = (struct GTMStackFrame *)__builtin_frame_address(0);
-#else
-#error architecture not supported
-#endif
-
-  NSUInteger level = 0;
-  while (level < count) {
-    if (fp == NULL) {
-      level--;
-      break;
-    }
-    outPcs[level] = fp->saved_pc;
-    level++;
-    fp = (struct GTMStackFrame *)fp->saved_fp;
-  }
-
-  return level;
-}
-#endif  // MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5
-
 NSUInteger GTMGetStackAddressDescriptors(struct GTMAddressDescriptor outDescs[],
                                          NSUInteger count) {
   if (count < 1 || !outDescs) return 0;
   NSUInteger result = 0;
-
-#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5
-  // Before 10.5, we collect the stack ourselves.
-
-  void **pcs = calloc(count, sizeof(void*));
-  if (!pcs) return 0;
-
-  NSUInteger newSize = GTMGetStackProgramCounters(pcs, count);
-
-  result = GTMGetStackAddressDescriptorsForAddresses(pcs, outDescs, newSize);
-  free(pcs);
-
-#else  //  MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5
-  // Use +[NSThread callStackReturnAddresses]
-
   NSArray *addresses = [NSThread callStackReturnAddresses];
   NSUInteger addrCount = [addresses count];
   if (addrCount) {
@@ -288,7 +226,6 @@ NSUInteger GTMGetStackAddressDescriptors(struct GTMAddressDescriptor outDescs[],
     }
     free(pcs);
   }
-#endif  // MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5
 
   return result;
 }
@@ -296,27 +233,6 @@ NSUInteger GTMGetStackAddressDescriptors(struct GTMAddressDescriptor outDescs[],
 NSString *GTMStackTrace(void) {
   // If we don't have enough frames, return an empty string
   NSString *result = @"";
-
-#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5
-  // Before 10.5, we collect the stack ourselves.
-
-  // The maximum number of stack frames that we will walk.  We limit this so
-  // that super-duper recursive functions (or bugs) don't send us for an
-  // infinite loop.
-  struct GTMAddressDescriptor descs[100];
-  size_t depth = sizeof(descs) / sizeof(struct GTMAddressDescriptor);
-  depth = GTMGetStackAddressDescriptors(descs, depth);
-
-  // Start at the second item so that GTMStackTrace and it's utility calls (of
-  // which there is currently 1) is not included in the output.
-  const size_t kTracesToStrip = 2;
-  if (depth > kTracesToStrip) {
-    result = GTMStackTraceFromAddressDescriptors(&descs[kTracesToStrip],
-                                                 (depth - kTracesToStrip));
-  }
-#else  //  MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5
-  // Use +[NSThread callStackReturnAddresses]
-
   NSArray *addresses = [NSThread callStackReturnAddresses];
   NSUInteger count = [addresses count];
   if (count) {
@@ -344,14 +260,10 @@ NSString *GTMStackTrace(void) {
     free(pcs);
     free(descs);
   }
-#endif  // MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5
 
   return result;
 }
 
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5 || \
-    (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && \
-     (__IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_2_0))
 
 NSString *GTMStackTraceFromException(NSException *e) {
   NSString *trace = @"";
@@ -382,5 +294,3 @@ NSString *GTMStackTraceFromException(NSException *e) {
   return trace;
 }
 
-#endif  // MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5
-        //__IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_2_0