simpleperf: export symbol_len in report lib interface.

It helps to set the range of a function when annotating source code
and disassemble code.

Also add comments in simpleperf_report_lib.py to make the meaning
of the structures clear.

Bug: http://b/66914187
Test: run test.py TestReportLib.
Change-Id: I1be996df8062ddb6759e9f98e0400f3a4df7efb6

1 files changed, 3 insertions, 0 deletions

diff --git a/simpleperf/report_lib_interface.cpp b/simpleperf/report_lib_interface.cpp
index 88bb4d7e..c7a606c9 100644
--- a/simpleperf/report_lib_interface.cpp
+++ b/simpleperf/report_lib_interface.cpp
@@ -59,6 +59,7 @@ struct SymbolEntry {
   uint64_t vaddr_in_file;
   const char* symbol_name;
   uint64_t symbol_addr;
+  uint64_t symbol_len;
   Mapping* mapping;
 };
 
@@ -304,6 +305,7 @@ SymbolEntry* ReportLib::GetSymbolOfCurrentSample() {
     current_symbol_.vaddr_in_file = vaddr_in_file;
     current_symbol_.symbol_name = symbol->DemangledName();
     current_symbol_.symbol_addr = symbol->addr;
+    current_symbol_.symbol_len = symbol->len;
     current_symbol_.mapping = AddMapping(*map);
     update_flag_ |= UPDATE_FLAG_OF_SYMBOL;
   }
@@ -351,6 +353,7 @@ CallChain* ReportLib::GetCallChainOfCurrentSample() {
           entry.symbol.vaddr_in_file = vaddr_in_file;
           entry.symbol.symbol_name = symbol->DemangledName();
           entry.symbol.symbol_addr = symbol->addr;
+          entry.symbol.symbol_len = symbol->len;
           entry.symbol.mapping = AddMapping(*map);
           callchain_entries_.push_back(entry);
         }