Export of internal Abseil changes

--
caf65de1a20b1ad286796a9eaee38f8b59e93f3b by Samuel Benzaquen <sbenza@google.com>:

Add a benchmark for StrAppend.

PiperOrigin-RevId: 327111569

--
2faa53fb3f4090f9609c7dea8951a82e1d72ce3a by Derek Mauro <dmauro@google.com>:

Add the inline namespace to the code generated by
gaussian_distribution_gentables

A previous changed manually added it to the output

PiperOrigin-RevId: 327022780

--
29edfd86e49e4d7665e843463f8df3c72467e909 by Derek Mauro <dmauro@google.com>:

Re-write the logic for detecting which stacktrace implementation to use on Linux.

The visible change is to detect the presence of the `<execinfo.h>`
header, which allows using the `backtrace`-based implementation when
it is available.

The logic has been simplified as well.

Fixes #746

PiperOrigin-RevId: 326911875

--
ce198204b77aac240e98fc8d5931b17a8b26bac3 by Abseil Team <absl-team@google.com>:

Demangle exception spec.

PiperOrigin-RevId: 326909460

--
c41b89954545bdc4430d10e785d3ba64a55122d5 by Abseil Team <absl-team@google.com>:

Add support for inheriting ctor.

PiperOrigin-RevId: 326904919
GitOrigin-RevId: caf65de1a20b1ad286796a9eaee38f8b59e93f3b
Change-Id: Ifd28b6a85a032839cbeafd1b16f88046dfd6c1d4

2 files changed, 70 insertions, 36 deletions

diff --git a/absl/debugging/internal/demangle.cc b/absl/debugging/internal/demangle.cc
index 87f13e50..b980d1b2 100644
--- a/absl/debugging/internal/demangle.cc
+++ b/absl/debugging/internal/demangle.cc
@@ -1082,20 +1082,28 @@ static bool ParseVOffset(State *state) {
   return false;
 }
 
-// <ctor-dtor-name> ::= C1 | C2 | C3
+// <ctor-dtor-name> ::= C1 | C2 | C3 | CI1 <base-class-type> | CI2
+// <base-class-type>
 //                  ::= D0 | D1 | D2
 // # GCC extensions: "unified" constructor/destructor.  See
-// # https://github.com/gcc-mirror/gcc/blob/7ad17b583c3643bd4557f29b8391ca7ef08391f5/gcc/cp/mangle.c#L1847
+// #
+// https://github.com/gcc-mirror/gcc/blob/7ad17b583c3643bd4557f29b8391ca7ef08391f5/gcc/cp/mangle.c#L1847
 //                  ::= C4 | D4
 static bool ParseCtorDtorName(State *state) {
   ComplexityGuard guard(state);
   if (guard.IsTooComplex()) return false;
   ParseState copy = state->parse_state;
-  if (ParseOneCharToken(state, 'C') && ParseCharClass(state, "1234")) {
-    const char *const prev_name = state->out + state->parse_state.prev_name_idx;
-    MaybeAppendWithLength(state, prev_name,
-                          state->parse_state.prev_name_length);
-    return true;
+  if (ParseOneCharToken(state, 'C')) {
+    if (ParseCharClass(state, "1234")) {
+      const char *const prev_name =
+          state->out + state->parse_state.prev_name_idx;
+      MaybeAppendWithLength(state, prev_name,
+                            state->parse_state.prev_name_length);
+      return true;
+    } else if (ParseOneCharToken(state, 'I') && ParseCharClass(state, "12") &&
+               ParseClassEnumType(state)) {
+      return true;
+    }
   }
   state->parse_state = copy;
 
@@ -1265,12 +1273,40 @@ static bool ParseBuiltinType(State *state) {
   return false;
 }
 
-// <function-type> ::= F [Y] <bare-function-type> [O] E
+//  <exception-spec> ::= Do                # non-throwing
+//                                           exception-specification (e.g.,
+//                                           noexcept, throw())
+//                   ::= DO <expression> E # computed (instantiation-dependent)
+//                                           noexcept
+//                   ::= Dw <type>+ E      # dynamic exception specification
+//                                           with instantiation-dependent types
+static bool ParseExceptionSpec(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+
+  if (ParseTwoCharToken(state, "Do")) return true;
+
+  ParseState copy = state->parse_state;
+  if (ParseTwoCharToken(state, "DO") && ParseExpression(state) &&
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  state->parse_state = copy;
+  if (ParseTwoCharToken(state, "Dw") && OneOrMore(ParseType, state) &&
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  return false;
+}
+
+// <function-type> ::= [exception-spec] F [Y] <bare-function-type> [O] E
 static bool ParseFunctionType(State *state) {
   ComplexityGuard guard(state);
   if (guard.IsTooComplex()) return false;
   ParseState copy = state->parse_state;
-  if (ParseOneCharToken(state, 'F') &&
+  if (Optional(ParseExceptionSpec(state)) && ParseOneCharToken(state, 'F') &&
       Optional(ParseOneCharToken(state, 'Y')) && ParseBareFunctionType(state) &&
       Optional(ParseOneCharToken(state, 'O')) &&
       ParseOneCharToken(state, 'E')) {
diff --git a/absl/debugging/internal/stacktrace_config.h b/absl/debugging/internal/stacktrace_config.h
index d5cc1740..90af8528 100644
--- a/absl/debugging/internal/stacktrace_config.h
+++ b/absl/debugging/internal/stacktrace_config.h
@@ -44,48 +44,46 @@
     !(TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_9_0)
 #define ABSL_STACKTRACE_INL_HEADER \
   "absl/debugging/internal/stacktrace_generic-inl.inc"
-#else
-#define ABSL_STACKTRACE_INL_HEADER \
-  "absl/debugging/internal/stacktrace_unimplemented-inl.inc"
 #endif
 
 #elif defined(__linux__) && !defined(__ANDROID__)
 
-#if !defined(NO_FRAME_POINTER)
-# if defined(__i386__) || defined(__x86_64__)
-#define ABSL_STACKTRACE_INL_HEADER \
-    "absl/debugging/internal/stacktrace_x86-inl.inc"
-# elif defined(__ppc__) || defined(__PPC__)
+#if defined(NO_FRAME_POINTER) && \
+    (defined(__i386__) || defined(__x86_64__) || defined(__aarch64__))
+// Note: The libunwind-based implementation is not available to open-source
+// users.
 #define ABSL_STACKTRACE_INL_HEADER \
-    "absl/debugging/internal/stacktrace_powerpc-inl.inc"
-# elif defined(__aarch64__)
-#define ABSL_STACKTRACE_INL_HEADER \
-    "absl/debugging/internal/stacktrace_aarch64-inl.inc"
-#elif defined(__arm__) && defined(__GLIBC__)
+  "absl/debugging/internal/stacktrace_libunwind-inl.inc"
+#define STACKTRACE_USES_LIBUNWIND 1
+#elif defined(NO_FRAME_POINTER) && defined(__has_include)
+#if __has_include(<execinfo.h>)
 // Note: When using glibc this may require -funwind-tables to function properly.
 #define ABSL_STACKTRACE_INL_HEADER \
   "absl/debugging/internal/stacktrace_generic-inl.inc"
-# else
+#endif
+#elif defined(__i386__) || defined(__x86_64__)
 #define ABSL_STACKTRACE_INL_HEADER \
-   "absl/debugging/internal/stacktrace_unimplemented-inl.inc"
-# endif
-#else  // defined(NO_FRAME_POINTER)
-# if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)
+  "absl/debugging/internal/stacktrace_x86-inl.inc"
+#elif defined(__ppc__) || defined(__PPC__)
 #define ABSL_STACKTRACE_INL_HEADER \
-    "absl/debugging/internal/stacktrace_generic-inl.inc"
-# elif defined(__ppc__) || defined(__PPC__)
+  "absl/debugging/internal/stacktrace_powerpc-inl.inc"
+#elif defined(__aarch64__)
 #define ABSL_STACKTRACE_INL_HEADER \
-    "absl/debugging/internal/stacktrace_generic-inl.inc"
-# else
+  "absl/debugging/internal/stacktrace_aarch64-inl.inc"
+#elif defined(__has_include)
+#if __has_include(<execinfo.h>)
+// Note: When using glibc this may require -funwind-tables to function properly.
 #define ABSL_STACKTRACE_INL_HEADER \
-   "absl/debugging/internal/stacktrace_unimplemented-inl.inc"
-# endif
-#endif  // NO_FRAME_POINTER
+  "absl/debugging/internal/stacktrace_generic-inl.inc"
+#endif
+#endif
 
-#else
+#endif
+
+// Fallback to the empty implementation.
+#if !defined(ABSL_STACKTRACE_INL_HEADER)
 #define ABSL_STACKTRACE_INL_HEADER \
   "absl/debugging/internal/stacktrace_unimplemented-inl.inc"
-
 #endif
 
 #endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_CONFIG_H_