Support generation of CFI in .debug_frame format.

.debug_frame section is almost identical to .eh_frame section.
There are only minor differences in the CIE and FDE headers.
The main difference is that .eh_frame is intended to be used
at runtime for exception handling and is therefore allocated
within the running program whereas .debug_frame is not.

This makes .debug_frame easier to remove using standard tools.
"objcopy --strip-debug" removes .debug_frame, but not .eh_frame.
(although objcopy can be still be forced to remove .eh_frame)

Similarly, we might want to separate the CFI to separate debug
file or include it as compressed .gnu_debugdata section.
It is more appropriate to use .debug_frame for this purpose.

Bug:20556771
Change-Id: I9d91a333b9fb37523fd6fafccfad89b21d2477af

1 files changed, 5 insertions, 5 deletions

diff --git a/compiler/dwarf/dwarf_test.h b/compiler/dwarf/dwarf_test.h
index 230ebe3a79..3afb5eae56 100644
--- a/compiler/dwarf/dwarf_test.h
+++ b/compiler/dwarf/dwarf_test.h
@@ -69,7 +69,7 @@ class DwarfTest : public CommonRuntimeTest {
     RawSection debug_abbrev(".debug_abbrev", SHT_PROGBITS, 0, nullptr, 0, 1, 0);
     RawSection debug_str(".debug_str", SHT_PROGBITS, 0, nullptr, 0, 1, 0);
     RawSection debug_line(".debug_line", SHT_PROGBITS, 0, nullptr, 0, 1, 0);
-    RawSection eh_frame(".eh_frame", SHT_PROGBITS, SHF_ALLOC, nullptr, 0, kPageSize, 0);
+    RawSection debug_frame(".debug_frame", SHT_PROGBITS, 0, nullptr, 0, 8, 0);
     if (!debug_info_data_.empty()) {
       debug_info.SetBuffer(debug_info_data_);
       builder.RegisterSection(&debug_info);
@@ -86,9 +86,9 @@ class DwarfTest : public CommonRuntimeTest {
       debug_line.SetBuffer(debug_line_data_);
       builder.RegisterSection(&debug_line);
     }
-    if (!eh_frame_data_.empty()) {
-      eh_frame.SetBuffer(eh_frame_data_);
-      builder.RegisterSection(&eh_frame);
+    if (!debug_frame_data_.empty()) {
+      debug_frame.SetBuffer(debug_frame_data_);
+      builder.RegisterSection(&debug_frame);
     }
     ScratchFile file;
     builder.Write(file.GetFile());
@@ -167,7 +167,7 @@ class DwarfTest : public CommonRuntimeTest {
   }
 
   // Buffers which are going to assembled into ELF file and passed to objdump.
-  std::vector<uint8_t> eh_frame_data_;
+  std::vector<uint8_t> debug_frame_data_;
   std::vector<uint8_t> debug_info_data_;
   std::vector<uint8_t> debug_abbrev_data_;
   std::vector<uint8_t> debug_str_data_;