Add debug_frame section support

Summary:
This is a beefed-up version of D33504, which adds support for dwarf 4
debug_frame section format.

The main difference here is that the decision whether to use eh_frame or
debug_frame is done on a per-function basis instead of per-object file.
This is necessary because one module can contain both sections (for
example, the start files added by the linker will typically pull in
eh_frame), but we want to be able to access both, for maximum
information.

I also add unit test for parsing various CFI formats (eh_frame,
debug_frame v3 and debug_frame v4).

Reviewers: jasonmolenda, clayborg

Subscribers: mgorny, aprantl, abidh, lldb-commits, tatyana-krasnukha

Differential Revision: https://reviews.llvm.org/D34613

llvm-svn: 306397

1 files changed, 17 insertions, 0 deletions

diff --git a/lldb/source/Commands/CommandObjectTarget.cpp b/lldb/source/Commands/CommandObjectTarget.cpp
index 343530ea4f3..4c8b514c13c 100644
--- a/lldb/source/Commands/CommandObjectTarget.cpp
+++ b/lldb/source/Commands/CommandObjectTarget.cpp
@@ -3426,6 +3426,23 @@ protected:
         result.GetOutputStream().Printf("\n");
       }
 
+      if (UnwindPlanSP plan_sp =
+              func_unwinders_sp->GetDebugFrameUnwindPlan(*target, 0)) {
+        result.GetOutputStream().Printf("debug_frame UnwindPlan:\n");
+        plan_sp->Dump(result.GetOutputStream(), thread.get(),
+                      LLDB_INVALID_ADDRESS);
+        result.GetOutputStream().Printf("\n");
+      }
+
+      if (UnwindPlanSP plan_sp =
+              func_unwinders_sp->GetDebugFrameAugmentedUnwindPlan(*target,
+                                                                  *thread, 0)) {
+        result.GetOutputStream().Printf("debug_frame augmented UnwindPlan:\n");
+        plan_sp->Dump(result.GetOutputStream(), thread.get(),
+                      LLDB_INVALID_ADDRESS);
+        result.GetOutputStream().Printf("\n");
+      }
+
       UnwindPlanSP arm_unwind_sp =
           func_unwinders_sp->GetArmUnwindUnwindPlan(*target, 0);
       if (arm_unwind_sp) {