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* [BPF] Do not generate BTF sections unnecessarilyYonghong Song2019-03-051-11/+0
| | | | | | | | | | | | If There is no types/non-empty strings, do not generate .BTF section. If there is no func_info/line_info, do not generate .BTF.ext section. Signed-off-by: Yonghong Song <yhs@fb.com> Differential Revision: https://reviews.llvm.org/D58936 llvm-svn: 355360
* [BPF] Generate BTF DebugInfo under BPF targetYonghong Song2018-12-191-0/+86
This patch implements BTF (BPF Type Format). The BTF is the debug info format for BPF, introduced in the below linux patch: https://github.com/torvalds/linux/commit/69b693f0aefa0ed521e8bd02260523b5ae446ad7#diff-06fb1c8825f653d7e539058b72c83332 and further extended several times, e.g., https://www.spinics.net/lists/netdev/msg534640.html https://www.spinics.net/lists/netdev/msg538464.html https://www.spinics.net/lists/netdev/msg540246.html The main advantage of implementing in LLVM is: . better integration/deployment as no extra tools are needed. . bpf JIT based compilation (like bcc, bpftrace, etc.) can get BTF without much extra effort. . BTF line_info needs selective source codes, which can be easily retrieved when inside the compiler. This patch implemented BTF generation by registering a BPF specific DebugHandler in BPFAsmPrinter. Signed-off-by: Yonghong Song <yhs@fb.com> Differential Revision: https://reviews.llvm.org/D55752 llvm-svn: 349640
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