Add debug info for link-time generated thunks.

Add debug info for method call thunks (currently unused) and
Baker read barrier thunks. Refactor debug info generation
for trampolines and record their sizes; change their names
to start with upper-case letters, so that they can be easily
generated as `#fn_name`.

This improved debug info must be generated by `dex2oat -g`,
the debug info generated by `oatdump --symbolize` remains
the same as before, except for the renamed trampolines and
an adjustment for "code delta", i.e. the Thumb mode bit.

Cortex-A53 erratum 843419 workaround thunks are not covered
by this CL.

Test: Manual; run-test --gdb -Xcompiler-option -g 160, pull
      symbols for gdbclient, break in the introspection
      entrypoint, check that gdb knows the new symbols
      (and disassembles them) and `backtrace` works when
      setting $pc to an address in the thunk.
Bug: 36141117
Change-Id: Id224b72cfa7a0628799c7db65e66e24c8517aabf

1 files changed, 7 insertions, 0 deletions

diff --git a/compiler/linker/relative_patcher.h b/compiler/linker/relative_patcher.h
index 38c8228422..53a096627f 100644
--- a/compiler/linker/relative_patcher.h
+++ b/compiler/linker/relative_patcher.h
@@ -31,6 +31,10 @@ class CompiledMethod;
 class LinkerPatch;
 class OutputStream;
 
+namespace debug {
+struct MethodDebugInfo;
+}  // namespace debug
+
 namespace linker {
 
 /**
@@ -114,6 +118,9 @@ class RelativePatcher {
                                            const LinkerPatch& patch,
                                            uint32_t patch_offset) = 0;
 
+  virtual std::vector<debug::MethodDebugInfo> GenerateThunkDebugInfo(
+      uint32_t executable_offset) = 0;
+
  protected:
   RelativePatcher()
       : size_code_alignment_(0u),