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, 12 insertions, 3 deletions

diff --git a/simpleperf/record_file_reader.cpp b/simpleperf/record_file_reader.cpp
index 38a4b2d6..9b68c654 100644
--- a/simpleperf/record_file_reader.cpp
+++ b/simpleperf/record_file_reader.cpp
@@ -443,7 +443,8 @@ bool RecordFileReader::ReadFileFeature(size_t& read_pos,
                                        std::string* file_path,
                                        uint32_t* file_type,
                                        uint64_t* min_vaddr,
-                                       std::vector<Symbol>* symbols) {
+                                       std::vector<Symbol>* symbols,
+                                       std::vector<uint64_t>* dex_file_offsets) {
   auto it = feature_section_descriptors_.find(FEAT_FILE);
   if (it == feature_section_descriptors_.end()) {
     return false;
@@ -484,6 +485,13 @@ bool RecordFileReader::ReadFileFeature(size_t& read_pos,
     p += name.size() + 1;
     symbols->emplace_back(name, start_vaddr, len);
   }
+  dex_file_offsets->clear();
+  if (*file_type == static_cast<uint32_t>(DSO_DEX_FILE)) {
+    uint32_t offset_count;
+    MoveFromBinaryFormat(offset_count, p);
+    dex_file_offsets->resize(offset_count);
+    MoveFromBinaryFormat(dex_file_offsets->data(), offset_count, p);
+  }
   CHECK_EQ(size, static_cast<size_t>(p - buf.data()));
   return true;
 }
@@ -518,10 +526,11 @@ void RecordFileReader::LoadBuildIdAndFileFeatures(ThreadTree& thread_tree) {
     uint32_t file_type;
     uint64_t min_vaddr;
     std::vector<Symbol> symbols;
+    std::vector<uint64_t> dex_file_offsets;
     size_t read_pos = 0;
     while (ReadFileFeature(
-        read_pos, &file_path, &file_type, &min_vaddr, &symbols)) {
-      thread_tree.AddDsoInfo(file_path, file_type, min_vaddr, &symbols);
+        read_pos, &file_path, &file_type, &min_vaddr, &symbols, &dex_file_offsets)) {
+      thread_tree.AddDsoInfo(file_path, file_type, min_vaddr, &symbols, dex_file_offsets);
     }
   }
 }