Relocate DWARF using .oat_patches.
The current solution is to hard-code knowledge of DWARF in the linker.
This works for simple use of DWARF, but breaks as soon as I try to do
anything more complex. Making the linker fully support DWARF would be
non-trivial task and would be essentially rewrite. Using .oat_patches
is much easier solution.
Relocating .debug_* sections required extending .oat_patches to support
more sections than just .text. I have encoded each section as
null-terminated section name followed by ULEB128 deltas.
The ULEB128 encoding shrinks .oat_patches for .text by factor of
about 6 with 64-bit compiler, and factor of 3 with 32-bit compiler.
On the other hand, it grows by the extra .oat_patches for DWARF which
were not present before (if debug symbols are included).
Overall, it is still a clear improvement even with the DWARF patches.
Change-Id: I78ffeda0f8a3da03341995a3b5ef15c954e16e9f
diff --git a/compiler/elf_writer_debug.h b/compiler/elf_writer_debug.h
index 39a99d6..4f1e333 100644
--- a/compiler/elf_writer_debug.h
+++ b/compiler/elf_writer_debug.h
@@ -25,7 +25,7 @@
namespace dwarf {
void WriteDebugSections(const CompilerDriver* compiler,
- const OatWriter* oat_writer,
+ OatWriter* oat_writer,
uint32_t text_section_offset,
std::vector<uint8_t>* eh_frame_data,
std::vector<uint8_t>* debug_info_data,