Simpleperf: support branch stack sampling in `simpleperf record`.

This only adds support in simpleperf. Branch stack sampling still
lacks kernel support on arm devices.
Use perf_event.h of bionic in host build, because the perf_event.h
of platform glibc is too old.

Bug: 19483574
Change-Id: I9c7332c054e93e7433717dd293d3f366b1802e2d

1 files changed, 11 insertions, 0 deletions

diff --git a/simpleperf/record.h b/simpleperf/record.h
index 83f60db9..bbcd7d01 100644
--- a/simpleperf/record.h
+++ b/simpleperf/record.h
@@ -68,6 +68,15 @@ struct PerfSamplePeriodType {
   uint64_t period;
 };
 
+struct PerfSampleBranchStackType {
+  struct BranchStackItemType {
+    uint64_t from;
+    uint64_t to;
+    uint64_t flags;
+  };
+  std::vector<BranchStackItemType> stack;
+};
+
 // SampleId is optional at the end of a record in binary format. Its content is determined by
 // sample_id_all and sample_type in perf_event_attr. To avoid the complexity of referring to
 // perf_event_attr each time, we copy sample_id_all and sample_type inside the SampleId structure.
@@ -177,6 +186,8 @@ struct SampleRecord : public Record {
   PerfSampleCpuType cpu_data;             // Valid if PERF_SAMPLE_CPU.
   PerfSamplePeriodType period_data;       // Valid if PERF_SAMPLE_PERIOD.
 
+  PerfSampleBranchStackType branch_stack_data;  // Valid if PERF_SAMPLE_BRANCH_STACK.
+
   SampleRecord(const perf_event_attr& attr, const perf_event_header* pheader);
 
  protected: