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This patch enables `-fpatchable-function-entry` on PPC64 little-endian
Linux. It is mutually exclusive with existing XRay instrumentation on
this target.
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This patch updates diagnostics to print fully qualified attribute names,
including scope when present.
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This patch enhances Clang's diagnosis of an unknown attribute by
printing the attribute's namespace in the diagnostic text. e.g.,
```cpp
[[foo::nodiscard]] int f(); // warning: unknown attribute 'foo::nodiscard' ignored
```
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For now only PPC big endian Linux 32 and 64 bit are supported.
PPC little endian Linux has XRAY support for 64-bit.
PPC AIX has different patchable function entry implementations.
Fixes #63220
Fixes #57031
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Similar to D98610 for RISCV.
This is going to be required by the upcoming Linux/LoongArch
[[ https://git.kernel.org/linus/4733f09d88074 | support for dynamic ftrace ]].
Reviewed By: SixWeining, MaskRay
Differential Revision: https://reviews.llvm.org/D141785
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'patchable_function_entry'
Similar to D72215 (AArch64) and D72220 (x86).
```
% clang -target riscv32 -march=rv64g -c -fpatchable-function-entry=2 a.c && llvm-objdump -dr a.o
...
0000000000000000 <main>:
0: 13 00 00 00 nop
4: 13 00 00 00 nop
% clang -target riscv32 -march=rv64gc -c -fpatchable-function-entry=2 a.c && llvm-objdump -dr a.o
...
00000002 <main>:
2: 01 00 nop
4: 01 00 nop
```
Recently the mainline kernel started to use -fpatchable-function-entry=8 for riscv (https://git.kernel.org/linus/afc76b8b80112189b6f11e67e19cf58301944814).
Differential Revision: https://reviews.llvm.org/D98610
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Reviewed By: nickdesaulniers
Differential Revision: https://reviews.llvm.org/D79495
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This feature is generic. Make it applicable for AArch64 and X86 because
the backend has only implemented NOP insertion for AArch64 and X86.
Reviewed By: nickdesaulniers, aaron.ballman
Differential Revision: https://reviews.llvm.org/D72221
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