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From: "shivam98.tkg at gmail dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug gdb/28371] gdb: watchpoint for local variable doesn't work on
 RISC-V
Date: Sun, 26 Sep 2021 18:17:08 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28371

--- Comment #3 from shivam98.tkg at gmail dot com <shivam98.tkg at gmail do=
t com> ---
Many thanks for replying. I really forget the I should see the assembly
generated by -S flag.

Yeah, so correct It seems the problem was, RISCV target didn't implement the
support for adding CFI (canonical frame information) instructions in the
epilogue. Specifically, say the following instruction/directive is missing =
in
func and func2 functions - `.cfi_def_cfa %rsp, 8 `which is present in clang=
 x86
assembly.  The support to inserts CFI instructions that set appropriate cfa
offset(.cfi_def_cfa_offset) and cfa register(.cfi_def_cfa_register) should =
be
added in emitEpilogue() in RISCVFrameLowering-
.https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/RISCV/RISCV=
FrameLowering.cpp#L535
. I will see how other backends are doing this and what should be done in t=
he
RISCV case and try to fix it.=20

Thanks again. It saves a lot of effort for me.

--=20
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