Export of internal Abseil changes

--
f3ac7ee28fc7de737bc9e2e1d10ff7739781d645 by Gennadiy Rozental <rogeeff@google.com>:

Internal change

PiperOrigin-RevId: 435739199
Change-Id: I8f854b742418a237f9060e4b9f23d0f20baf0bdf

--
fe1329708cb40da8e72e53e4eaad79112bdb79ea by Abseil Team <absl-team@google.com>:

Port SwissTable internals comments from github.com/google/cwisstable to Abseil.

PiperOrigin-RevId: 435719801
Change-Id: I2270cc93aaa5d3d57954a8cea7e570b72b6c3956

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a6e6fcd4b944ce370ac3307e848645c27bf21e47 by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 435716325
Change-Id: I77999f69e176ee6c0d18e7c3329a7c336164f0fc
GitOrigin-RevId: f3ac7ee28fc7de737bc9e2e1d10ff7739781d645

1 files changed, 14 insertions, 7 deletions

diff --git a/absl/debugging/internal/examine_stack.h b/absl/debugging/internal/examine_stack.h
index 61f0056f..190af87f 100644
--- a/absl/debugging/internal/examine_stack.h
+++ b/absl/debugging/internal/examine_stack.h
@@ -31,7 +31,7 @@ typedef void OutputWriter(const char*, void*);
 // `hook` that is called each time DumpStackTrace() is called.
 // `hook` may be called from a signal handler.
 typedef void (*SymbolizeUrlEmitter)(void* const stack[], int depth,
-                                    OutputWriter writer, void* writer_arg);
+                                    OutputWriter* writer, void* writer_arg);
 
 // Registration of SymbolizeUrlEmitter for use inside of a signal handler.
 // This is inherently unsafe and must be signal safe code.
@@ -41,14 +41,21 @@ SymbolizeUrlEmitter GetDebugStackTraceHook();
 // Returns the program counter from signal context, or nullptr if
 // unknown. `vuc` is a ucontext_t*. We use void* to avoid the use of
 // ucontext_t on non-POSIX systems.
-void* GetProgramCounter(void* vuc);
+void* GetProgramCounter(void* const vuc);
 
-// Uses `writerfn` to dump the program counter, stack trace, and stack
+// Uses `writer` to dump the program counter, stack trace, and stack
 // frame sizes.
-void DumpPCAndFrameSizesAndStackTrace(
-    void* pc, void* const stack[], int frame_sizes[], int depth,
-    int min_dropped_frames, bool symbolize_stacktrace,
-    void (*writerfn)(const char*, void*), void* writerfn_arg);
+void DumpPCAndFrameSizesAndStackTrace(void* const pc, void* const stack[],
+                                      int frame_sizes[], int depth,
+                                      int min_dropped_frames,
+                                      bool symbolize_stacktrace,
+                                      OutputWriter* writer, void* writer_arg);
+
+// Dump current stack trace omitting the topmost `min_dropped_frames` stack
+// frames.
+void DumpStackTrace(int min_dropped_frames, int max_num_frames,
+                    bool symbolize_stacktrace, OutputWriter* writer,
+                    void* writer_arg);
 
 }  // namespace debugging_internal
 ABSL_NAMESPACE_END