From 5c54f15c55e7d5f73496b9a2957bd673dd785414 Mon Sep 17 00:00:00 2001 From: Peter Collingbourne Date: Fri, 27 Oct 2017 17:49:40 +0000 Subject: ELF: Add support for emitting dynamic relocations in the Android relocation packing format. The Android relocation packing format is a more compact format for dynamic relocations in executables and DSOs that is based on delta encoding and SLEBs. An overview of the format can be found in the Android source code: https://android.googlesource.com/platform/bionic/+/refs/heads/master/tools/relocation_packer/src/delta_encoder.h This patch implements relocation packing using that format. This implementation uses a more intelligent algorithm for compressing relative relocations than Android's own relocation packer. As a result it can generally create smaller relocation sections than that packer. If I link Chromium for Android targeting ARM32 I get a .rel.dyn of size 174693 bytes, as compared to 371832 bytes with gold and the Android packer. Differential Revision: https://reviews.llvm.org/D39152 llvm-svn: 316775 --- llvm/lib/Object/ELF.cpp | 2 ++ 1 file changed, 2 insertions(+) (limited to 'llvm/lib/Object/ELF.cpp') diff --git a/llvm/lib/Object/ELF.cpp b/llvm/lib/Object/ELF.cpp index 2bb1fd56894..c72a1258c1e 100644 --- a/llvm/lib/Object/ELF.cpp +++ b/llvm/lib/Object/ELF.cpp @@ -201,6 +201,8 @@ StringRef llvm::object::getELFSectionTypeName(uint32_t Machine, unsigned Type) { STRINGIFY_ENUM_CASE(ELF, SHT_PREINIT_ARRAY); STRINGIFY_ENUM_CASE(ELF, SHT_GROUP); STRINGIFY_ENUM_CASE(ELF, SHT_SYMTAB_SHNDX); + STRINGIFY_ENUM_CASE(ELF, SHT_ANDROID_REL); + STRINGIFY_ENUM_CASE(ELF, SHT_ANDROID_RELA); STRINGIFY_ENUM_CASE(ELF, SHT_LLVM_ODRTAB); STRINGIFY_ENUM_CASE(ELF, SHT_GNU_ATTRIBUTES); STRINGIFY_ENUM_CASE(ELF, SHT_GNU_HASH); -- cgit v1.2.3