[compiler-rt] [llvm] [PGO][AMDGPU] Add basic HIP offload PGO support (PR #177665)

[Matt Arsenault via llvm-commits]

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@@ -0,0 +1,830 @@
+//===- InstrProfilingPlatformROCm.cpp - Profile data ROCm platform -------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+extern "C" {
+#include "InstrProfiling.h"
+#include "InstrProfilingInternal.h"
+#include "InstrProfilingPort.h"
+}
+
+// interception.h pulls in sanitizer_internal_defs.h, which normally includes
+// sanitizer_redefine_builtins.h. That uses inline asm to alias
+// memcpy/memmove/memset to __sanitizer_internal_* (see sanitizer_libc.cpp in
+// sanitizer_common). The instrumented *host* link for HIP (-fprofile-generate)
+// only pulls in libclang_rt.profile.a, not the full sanitizer_common objects
+// that define those symbols, so we get undefined references at link time. This
+// TU does not need the sanitizer builtin redirect; keep using libc
+// memcpy/memset.
+#define SANITIZER_COMMON_NO_REDEFINE_BUILTINS 1
+#include "interception/interception.h"
+#undef SANITIZER_COMMON_NO_REDEFINE_BUILTINS
+// C library headers (not <cstdio> etc.): clang_rt.profile is built with
+// -nostdinc++ and avoids the C++ standard library (see profile/CMakeLists.txt).
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static int ProcessDeviceOffloadPrf(void *DeviceOffloadPrf, int TUIndex,
+                                   const char *Target);
+
+static int IsVerboseMode() {
+  static int IsVerbose = -1;
+  if (IsVerbose == -1)
+    IsVerbose = getenv("LLVM_PROFILE_VERBOSE") != nullptr;
+  return IsVerbose;
+}
+
+/* -------------------------------------------------------------------------- */
+/*  Dynamic loading of HIP runtime symbols                                   */
+/* -------------------------------------------------------------------------- */
+
+typedef int (*hipGetSymbolAddressTy)(void **, const void *);
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arsenm wrote:

using function_ref?

https://github.com/llvm/llvm-project/pull/177665