[clang] [compiler-rt] [XRay] Add support for instrumentation of DSOs on x86_64 (PR #90959)

[Jan Patrick Lehr via llvm-commits]

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@@ -50,14 +52,72 @@ atomic_uint8_t XRayInitialized{0};
 
 // This should always be updated before XRayInitialized is updated.
 SpinMutex XRayInstrMapMutex;
-XRaySledMap XRayInstrMap;
+// XRaySledMap XRayInstrMap;
+//  Contains maps for the main executable as well as DSOs.
+// std::vector<XRaySledMap> XRayInstrMaps;
+XRaySledMap *XRayInstrMaps;
+atomic_uint32_t XRayNumObjects;
 
 // Global flag to determine whether the flags have been initialized.
 atomic_uint8_t XRayFlagsInitialized{0};
 
 // A mutex to allow only one thread to initialize the XRay data structures.
 SpinMutex XRayInitMutex;
 
+int32_t
+__xray_register_sleds(const XRaySledEntry *SledsBegin,
+                      const XRaySledEntry *SledsEnd,
+                      const XRayFunctionSledIndex *FnIndexBegin,
+                      const XRayFunctionSledIndex *FnIndexEnd, bool FromDSO,
+                      XRayTrampolines Trampolines) XRAY_NEVER_INSTRUMENT {
+  if (!SledsBegin || !SledsEnd) {
+    return -1;
+  }
+  XRaySledMap SledMap;
+  SledMap.FromDSO = FromDSO;
+  SledMap.Loaded = true;
+  SledMap.Trampolines = Trampolines;
+  SledMap.Sleds = SledsBegin;
+  SledMap.Entries = SledsEnd - SledsBegin;
+  if (FnIndexBegin != nullptr) {
+    SledMap.SledsIndex = FnIndexBegin;
+    SledMap.Functions = FnIndexEnd - FnIndexBegin;
+  } else {
+    size_t CountFunctions = 0;
+    uint64_t LastFnAddr = 0;
+
+    for (std::size_t I = 0; I < SledMap.Entries; I++) {
+      const auto &Sled = SledMap.Sleds[I];
+      const auto Function = Sled.function();
+      if (Function != LastFnAddr) {
+        CountFunctions++;
+        LastFnAddr = Function;
+      }
+    }
+
+    SledMap.Functions = CountFunctions;
+  }
+  if (SledMap.Functions >= XRayMaxFunctions) {
+    Report("Too many functions! Maximum is %ld\n", XRayMaxFunctions);
+    return -1;
+  }
+
+  if (Verbosity()) {
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jplehr wrote:

No curly here

https://github.com/llvm/llvm-project/pull/90959