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# d82247cb 05-Mar-2019 Yonghong Song <[email protected]>

[BPF] Do not generate BTF sections unnecessarily

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-o

[BPF] Do not generate BTF sections unnecessarily

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 <[email protected]>

Differential Revision: https://reviews.llvm.org/D58936

llvm-svn: 355360

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Revision tags: llvmorg-8.0.0-rc3, llvmorg-7.1.0, llvmorg-7.1.0-rc1, llvmorg-8.0.0-rc2, llvmorg-8.0.0-rc1
# 7b410ac3 19-Dec-2018 Yonghong Song <[email protected]>

[BPF] Generate BTF DebugInfo under BPF target

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/torvald

[BPF] Generate BTF DebugInfo under BPF target

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 <[email protected]>

Differential Revision: https://reviews.llvm.org/D55752

llvm-svn: 349640

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