forked from OSchip/llvm-project
150ca5143b
Currently, BPF has XADD (locked add) insn support and the asm looks like: lock *(u32 *)(r1 + 0) += r2 lock *(u64 *)(r1 + 0) += r2 The instruction itself does not have a return value. At the source code level, users often use __sync_fetch_and_add() which eventually translates to XADD. The return value of __sync_fetch_and_add() is supposed to be the old value in the xadd memory location. Since BPF::XADD insn does not support such a return value, this patch added a PreEmit phase to check such a usage. If such an illegal usage pattern is detected, a fatal error will be reported like line 4: Invalid usage of the XADD return value if compiled with -g, or Invalid usage of the XADD return value if compiled without -g. Signed-off-by: Yonghong Song <yhs@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> llvm-svn: 342692 |
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| Analysis | ||
| AsmParser | ||
| BinaryFormat | ||
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| CodeGen | ||
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| Demangle | ||
| ExecutionEngine | ||
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| Fuzzer | ||
| IR | ||
| IRReader | ||
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| LineEditor | ||
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| ProfileData | ||
| Support | ||
| TableGen | ||
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| WindowsManifest | ||
| XRay | ||
| CMakeLists.txt | ||
| LLVMBuild.txt | ||