[llvm] [ORC][JITLink] Add Intel VTune support to JITLink (PR #81826)

[Lang Hames via llvm-commits]

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@@ -0,0 +1,191 @@
+//===--- VTuneSupportPlugin.cpp -- Support for VTune profiler --*- C++ -*--===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Handles support for registering code with VIntel Tune's Amplfiier JIT API.
+//
+//===----------------------------------------------------------------------===//
+#include "llvm/ExecutionEngine/Orc/Debugging/VTuneSupportPlugin.h"
+#include "llvm/DebugInfo/DWARF/DWARFContext.h"
+#include "llvm/ExecutionEngine/Orc/Debugging/DebugInfoSupport.h"
+
+using namespace llvm;
+using namespace llvm::orc;
+using namespace llvm::jitlink;
+
+namespace {
+
+constexpr StringRef RegisterVTuneImplName = "llvm_orc_registerVTuneImpl";
+constexpr StringRef UnregisterVTuneImplName = "llvm_orc_unregisterVTuneImpl";
+constexpr StringRef RegisterTestVTuneImplName =
+    "llvm_orc_test_registerVTuneImpl";
+
+static VTuneMethodBatch getMethodBatch(LinkGraph &G, bool EmitDebugInfo) {
+  VTuneMethodBatch Batch;
+  std::unique_ptr<DWARFContext> DC;
+  StringMap<std::unique_ptr<MemoryBuffer>> DCBacking;
+  if (EmitDebugInfo) {
+    auto EDC = createDWARFContext(G);
+    if (!EDC) {
+      // ERROR
+      EmitDebugInfo = false;
+    } else {
+      DC = std::move(EDC->first);
+      DCBacking = std::move(EDC->second);
+    }
+  }
+
+  auto GetStringIdx = [Deduplicator = StringMap<uint32_t>(),
+                       &Batch](StringRef S) mutable {
+    auto I = Deduplicator.find(S);
+    if (I != Deduplicator.end()) {
+      return I->second;
+    }
----------------
lhames wrote:

The LLVM style guide omits braces for single line statements, so this could just be:
```c++
if (I != Deduplicator.end())
  return I->second;
```

https://github.com/llvm/llvm-project/pull/81826