simpleperf: support showing symbols for interpreted java code.

To convert from a dex_pc (returned by libunwindstack) to a symbol name,
we need below things:
1. The mapping info of the vdex file containing the dex_pc.
2. The offsets of dex files in the vdex file.

So make below changes:
1. Record none executable maps when profiling java code.
2. Refactor dso code to add a new type for dex file, using DexFileDso
   to store dex file offsets in a vdex file, and load symbols from that
   vdex file.
3. Add read_dex_file.cpp to read java symbols using libdexfile.
4. Change the format of file section in record_file_format.h, to store
   dex file offsets in vdex files.

Bug: http://b/73126888
Bug: http://b/77236599
Test: Run simpleperf to profile several apps manually, can see
Test: callstacks of both java code and native code.
Test: Run simpleperf_unit_test.

Change-Id: I08005a03beb3df1a70db034bc463f555934856ba

1 files changed, 1 insertions, 3 deletions

diff --git a/simpleperf/JITDebugReader.h b/simpleperf/JITDebugReader.h
index 22149190..191b351c 100644
--- a/simpleperf/JITDebugReader.h
+++ b/simpleperf/JITDebugReader.h
@@ -37,9 +37,7 @@ struct JITSymFile {
 };
 
 struct DexSymFile {
-  uint64_t addr; // The start addr of the dex file in memory.
-  uint64_t len;  // The size of the dex file in memory.
-  uint64_t pgoff;  // The file offset of the dex file in the file containing it
+  uint64_t dex_file_offset;  // The offset of the dex file in the file containing it
   std::string file_path;  // The path of file containing the dex file
 };