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authorGravatar Abseil Team <absl-team@google.com>2022-03-07 22:25:14 -0800
committerGravatar Derek Mauro <dmauro@google.com>2022-03-08 08:54:06 -0500
commitf9b99adeddbe71208e65cead5f349add7aa9c9b5 (patch)
treec728f274aba8be325cfcb2469182b8f18bb28aee
parent04bde89e5cb33bf4a714a5496fac715481fc4831 (diff)
Export of internal Abseil changes
-- 0b01bad05b4cdea647ad274d64af0d6732787a1d by Gennadiy Rozental <rogeeff@google.com>: Internal change PiperOrigin-RevId: 433124996 Change-Id: I0a081fb5cbb628901e4913a9c587468ca3b3aaa4 GitOrigin-RevId: 0b01bad05b4cdea647ad274d64af0d6732787a1d
-rw-r--r--absl/debugging/internal/examine_stack.cc10
-rw-r--r--absl/debugging/internal/examine_stack.h15
2 files changed, 25 insertions, 0 deletions
diff --git a/absl/debugging/internal/examine_stack.cc b/absl/debugging/internal/examine_stack.cc
index 2fbfea8e..81d216f9 100644
--- a/absl/debugging/internal/examine_stack.cc
+++ b/absl/debugging/internal/examine_stack.cc
@@ -37,6 +37,16 @@ namespace absl {
ABSL_NAMESPACE_BEGIN
namespace debugging_internal {
+namespace {
+ABSL_CONST_INIT SymbolizeUrlEmitter debug_stack_trace_hook = nullptr;
+} // namespace
+
+void RegisterDebugStackTraceHook(SymbolizeUrlEmitter hook) {
+ debug_stack_trace_hook = hook;
+}
+
+SymbolizeUrlEmitter GetDebugStackTraceHook() { return debug_stack_trace_hook; }
+
// Returns the program counter from signal context, nullptr if
// unknown. vuc is a ucontext_t*. We use void* to avoid the use of
// ucontext_t on non-POSIX systems.
diff --git a/absl/debugging/internal/examine_stack.h b/absl/debugging/internal/examine_stack.h
index 39336913..61f0056f 100644
--- a/absl/debugging/internal/examine_stack.h
+++ b/absl/debugging/internal/examine_stack.h
@@ -23,6 +23,21 @@ namespace absl {
ABSL_NAMESPACE_BEGIN
namespace debugging_internal {
+// Type of function used for printing in stack trace dumping, etc.
+// We avoid closures to keep things simple.
+typedef void OutputWriter(const char*, void*);
+
+// RegisterDebugStackTraceHook() allows to register a single routine
+// `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);
+
+// Registration of SymbolizeUrlEmitter for use inside of a signal handler.
+// This is inherently unsafe and must be signal safe code.
+void RegisterDebugStackTraceHook(SymbolizeUrlEmitter hook);
+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.