Export of internal Abseil changes

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41ac0d9b32618a1df717984afcb808858089bda7 by Derek Mauro <dmauro@google.com>:

Removes usages of deprecated RunningOnValgrind

PiperOrigin-RevId: 323649256

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5453d131af475b434dcd86ab326e4a2cf780857f by Abseil Team <absl-team@google.com>:

Internal change.

PiperOrigin-RevId: 323630307
GitOrigin-RevId: 41ac0d9b32618a1df717984afcb808858089bda7
Change-Id: I523016e0ecdb8d141aa069ad2846f5e4abbe014c

3 files changed, 21 insertions, 9 deletions

diff --git a/absl/debugging/internal/symbolize.h b/absl/debugging/internal/symbolize.h
index 663d774d..b3729af7 100644
--- a/absl/debugging/internal/symbolize.h
+++ b/absl/debugging/internal/symbolize.h
@@ -18,6 +18,8 @@
 #ifndef ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_
 #define ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_
 
+#ifdef __cplusplus
+
 #include <cstddef>
 #include <cstdint>
 
@@ -132,4 +134,16 @@ bool GetFileMappingHint(const void** start,
 ABSL_NAMESPACE_END
 }  // namespace absl
 
+#endif  // __cplusplus
+
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C"
+#endif  // __cplusplus
+
+    bool
+    AbslInternalGetFileMappingHint(const void** start, const void** end,
+                                   uint64_t* offset, const char** filename);
+
 #endif  // ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_
diff --git a/absl/debugging/internal/vdso_support.cc b/absl/debugging/internal/vdso_support.cc
index 19deb3cf..6be16d90 100644
--- a/absl/debugging/internal/vdso_support.cc
+++ b/absl/debugging/internal/vdso_support.cc
@@ -76,15 +76,6 @@ const void *VDSOSupport::Init() {
   }
 #endif  // __GLIBC_PREREQ(2, 16)
   if (vdso_base_.load(std::memory_order_relaxed) == kInvalidBase) {
-    // Valgrind zaps AT_SYSINFO_EHDR and friends from the auxv[]
-    // on stack, and so glibc works as if VDSO was not present.
-    // But going directly to kernel via /proc/self/auxv below bypasses
-    // Valgrind zapping. So we check for Valgrind separately.
-    if (RunningOnValgrind()) {
-      vdso_base_.store(nullptr, std::memory_order_relaxed);
-      getcpu_fn_.store(&GetCPUViaSyscall, std::memory_order_relaxed);
-      return nullptr;
-    }
     int fd = open("/proc/self/auxv", O_RDONLY);
     if (fd == -1) {
       // Kernel too old to have a VDSO.
diff --git a/absl/debugging/symbolize_elf.inc b/absl/debugging/symbolize_elf.inc
index 2f97cc7e..7c36fd13 100644
--- a/absl/debugging/symbolize_elf.inc
+++ b/absl/debugging/symbolize_elf.inc
@@ -1551,3 +1551,10 @@ bool Symbolize(const void *pc, char *out, int out_size) {
 
 ABSL_NAMESPACE_END
 }  // namespace absl
+
+extern "C" bool AbslInternalGetFileMappingHint(const void **start,
+                                               const void **end, uint64_t *offset,
+                                               const char **filename) {
+  return absl::debugging_internal::GetFileMappingHint(start, end, offset,
+                                                      filename);
+}