Export of internal Abseil changes

--
1a5831c2b4b85e0151b7952e47f4b80827937620 by Laramie Leavitt <lar@google.com>:

Implement FuzzingBitGen, an adapter which allows existing randomized tests which use absl::BitGenRef to easily integrate with fuzz testing.

I found myself implementing a similar option in our tensorstore project to fuzz test a storage layer and figured that it would be more useful as a common tool with defaults that take the non-random path.

This is similar to the FuzzedDataProvider mechanism which generates random values from a fuzz string, and is used to generate fuzz test inputs, and internally it uses FuzzedDataProvider.

The basic technique used here is to construct mocking lambdas for all of the absl mock distribution configurations, and forwarding the parameters to fuzzing-specific implementations that call into FuzzedDataProvider. The default paths for the distributions are either the bounds or a median value.

PiperOrigin-RevId: 358432715

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e7968538c5ef5cd0b9822dbeac0f659b5e7d49b3 by Derek Mauro <dmauro@google.com>:

Give extern C symbols a unique name when the inline namespace
is given.

This partially addresses #851

PiperOrigin-RevId: 358403842
GitOrigin-RevId: 1a5831c2b4b85e0151b7952e47f4b80827937620
Change-Id: Id5ca0251498e390a8efa7210a17cc2cabb2c7dd8

1 files changed, 24 insertions, 10 deletions

diff --git a/absl/base/dynamic_annotations.h b/absl/base/dynamic_annotations.h
index 545f8cbc..880cbf6e 100644
--- a/absl/base/dynamic_annotations.h
+++ b/absl/base/dynamic_annotations.h
@@ -110,6 +110,9 @@
 // Define race annotations.
 
 #if ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED == 1
+// Some of the symbols used in this section (e.g. AnnotateBenignRaceSized) are
+// defined by the compiler-based santizer implementation, not by the Abseil
+// library. Therefore they do not use ABSL_INTERNAL_C_SYMBOL.
 
 // -------------------------------------------------------------
 // Annotations that suppress errors. It is usually better to express the
@@ -286,17 +289,22 @@ ABSL_INTERNAL_END_EXTERN_C
 // Define IGNORE_READS_BEGIN/_END annotations.
 
 #if ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED == 1
+// Some of the symbols used in this section (e.g. AnnotateIgnoreReadsBegin) are
+// defined by the compiler-based implementation, not by the Abseil
+// library. Therefore they do not use ABSL_INTERNAL_C_SYMBOL.
 
 // Request the analysis tool to ignore all reads in the current thread until
 // ABSL_ANNOTATE_IGNORE_READS_END is called. Useful to ignore intentional racey
 // reads, while still checking other reads and all writes.
 // See also ABSL_ANNOTATE_UNPROTECTED_READ.
-#define ABSL_ANNOTATE_IGNORE_READS_BEGIN() \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsBegin)(__FILE__, __LINE__)
+#define ABSL_ANNOTATE_IGNORE_READS_BEGIN()              \
+  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsBegin) \
+  (__FILE__, __LINE__)
 
 // Stop ignoring reads.
-#define ABSL_ANNOTATE_IGNORE_READS_END() \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsEnd)(__FILE__, __LINE__)
+#define ABSL_ANNOTATE_IGNORE_READS_END()              \
+  ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsEnd) \
+  (__FILE__, __LINE__)
 
 // Function prototypes of annotations provided by the compiler-based sanitizer
 // implementation.
@@ -316,16 +324,22 @@ ABSL_INTERNAL_END_EXTERN_C
 // TODO(delesley) -- The exclusive lock here ignores writes as well, but
 // allows IGNORE_READS_AND_WRITES to work properly.
 
-#define ABSL_ANNOTATE_IGNORE_READS_BEGIN() \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AbslInternalAnnotateIgnoreReadsBegin)()
+#define ABSL_ANNOTATE_IGNORE_READS_BEGIN()                          \
+  ABSL_INTERNAL_GLOBAL_SCOPED(                                      \
+      ABSL_INTERNAL_C_SYMBOL(AbslInternalAnnotateIgnoreReadsBegin)) \
+  ()
 
-#define ABSL_ANNOTATE_IGNORE_READS_END() \
-  ABSL_INTERNAL_GLOBAL_SCOPED(AbslInternalAnnotateIgnoreReadsEnd)()
+#define ABSL_ANNOTATE_IGNORE_READS_END()                          \
+  ABSL_INTERNAL_GLOBAL_SCOPED(                                    \
+      ABSL_INTERNAL_C_SYMBOL(AbslInternalAnnotateIgnoreReadsEnd)) \
+  ()
 
-ABSL_INTERNAL_STATIC_INLINE void AbslInternalAnnotateIgnoreReadsBegin()
+ABSL_INTERNAL_STATIC_INLINE void ABSL_INTERNAL_C_SYMBOL(
+    AbslInternalAnnotateIgnoreReadsBegin)()
     ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE {}
 
-ABSL_INTERNAL_STATIC_INLINE void AbslInternalAnnotateIgnoreReadsEnd()
+ABSL_INTERNAL_STATIC_INLINE void ABSL_INTERNAL_C_SYMBOL(
+    AbslInternalAnnotateIgnoreReadsEnd)()
     ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE {}
 
 #else