Add a simple stack trace printer for DFSan

Reviewed-by: morehouse
Differential Revision: https://reviews.llvm.org/D91235

compiler-rt/lib/dfsan/CMakeLists.txt

@@ -31,6 +31,7 @@ foreach(arch ${DFSAN_SUPPORTED_ARCH})
             $<TARGET_OBJECTS:RTInterception.${arch}>
             $<TARGET_OBJECTS:RTSanitizerCommon.${arch}>
             $<TARGET_OBJECTS:RTSanitizerCommonLibc.${arch}>
+            $<TARGET_OBJECTS:RTSanitizerCommonSymbolizer.${arch}>
     ADDITIONAL_HEADERS ${DFSAN_RTL_HEADERS}
     CFLAGS ${DFSAN_CFLAGS}
     PARENT_TARGET dfsan)

compiler-rt/lib/dfsan/dfsan.cpp

@@ -27,6 +27,7 @@
 #include "sanitizer_common/sanitizer_flags.h"
 #include "sanitizer_common/sanitizer_internal_defs.h"
 #include "sanitizer_common/sanitizer_libc.h"
+#include "sanitizer_common/sanitizer_stacktrace.h"
 
 using namespace __dfsan;
 
@@ -407,6 +408,22 @@ dfsan_dump_labels(int fd) {
   }
 }
 
+#define GET_FATAL_STACK_TRACE_PC_BP(pc, bp) \
+  BufferedStackTrace stack;                 \
+  stack.Unwind(pc, bp, nullptr, common_flags()->fast_unwind_on_fatal);
+
+void __sanitizer::BufferedStackTrace::UnwindImpl(uptr pc, uptr bp,
+                                                 void *context,
+                                                 bool request_fast,
+                                                 u32 max_depth) {
+  Unwind(max_depth, pc, bp, context, 0, 0, false);
+}
+
+extern "C" SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_print_stack_trace() {
+  GET_FATAL_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME());
+  stack.Print();
+}
+
 void Flags::SetDefaults() {
 #define DFSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
 #include "dfsan_flags.inc"