[compiler-rt] [llvm] [ctxprof][nfc] Share the definition of FunctionData between compiler-rt and llvm (PR #132136)

[Snehasish Kumar via llvm-commits]

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@@ -113,6 +113,24 @@ class ContextNode final {
   uint64_t entrycount() const { return counters()[0]; }
 };
 
+/// The internal structure of FunctionData. This makes sure that changes to
+/// the fields of FunctionData either get automatically captured on the llvm
+/// side, or force a manual corresponding update.
+///
+/// The macro arguments (see CtxInstrProfiling.h for example):
+///
+/// PTRDECL is a macro taking 2 parameters: a type and the name of the field.
+/// The field is a pointer of that type;
+///
+/// VOLATILE_PTRDECL is the same as above, but for volatile pointers;
+///
+/// MUTEXDECL takes one parameter, the name of a field that is a mutex.
+#define CTXPROF_FUNCTION_DATA(PTRDECL, VOLATILE_PTRDECL, MUTEXDECL)            \
+  PTRDECL(FunctionData, Next)                                                  \
+  VOLATILE_PTRDECL(ContextRoot, CtxRoot)                                       \
+  VOLATILE_PTRDECL(ContextNode, FlatCtx)                                       \
+  MUTEXDECL(Mutex)
+
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snehasish wrote:

Thanks for pointing out that this is exactly what is mentioned in the description. 

https://github.com/llvm/llvm-project/pull/132136