[Clang] Unify 'nvptx-arch' and 'amdgpu-arch' into 'offload-arch'

Summary:
These two tools do the same thing, we should unify them into a single
tool. We create symlinks for backward compatiblity and provide a way to
get the old vendor specific behavior with `--amdgpu-only` and
`--nvptx-only`.

Author: jhuber6

clang/tools/CMakeLists.txt

@@ -50,5 +50,4 @@ add_llvm_external_project(clang-tools-extra extra)
 # libclang may require clang-tidy in clang-tools-extra.
 add_clang_subdirectory(libclang)
 
-add_clang_subdirectory(amdgpu-arch)
-add_clang_subdirectory(nvptx-arch)
+add_clang_subdirectory(offload-arch)

clang/tools/amdgpu-arch/AMDGPUArch.cpp

@@ -0,0 +1,8 @@
+set(LLVM_LINK_COMPONENTS Support)
+
+add_clang_tool(offload-arch OffloadArch.cpp NVPTXArch.cpp AMDGPUArchByKFD.cpp AMDGPUArchByHIP.cpp)
+
+add_clang_symlink(amdgpu-arch offload-arch)
+add_clang_symlink(nvptx-arch offload-arch)
+
+target_link_libraries(offload-arch PRIVATE clangBasic)

clang/tools/amdgpu-arch/CMakeLists.txt

@@ -21,15 +21,6 @@
 
 using namespace llvm;
 
-static cl::opt<bool> Help("h", cl::desc("Alias for -help"), cl::Hidden);
-
-static void PrintVersion(raw_ostream &OS) {
-  OS << clang::getClangToolFullVersion("nvptx-arch") << '\n';
-}
-// Mark all our options with this category, everything else (except for -version
-// and -help) will be hidden.
-static cl::OptionCategory NVPTXArchCategory("nvptx-arch options");
-
 typedef enum cudaError_enum {
   CUDA_SUCCESS = 0,
   CUDA_ERROR_NO_DEVICE = 100,
@@ -84,22 +75,7 @@ static int handleError(CUresult Err) {
   return 1;
 }
 
-int main(int argc, char *argv[]) {
-  cl::HideUnrelatedOptions(NVPTXArchCategory);
-
-  cl::SetVersionPrinter(PrintVersion);
-  cl::ParseCommandLineOptions(
-      argc, argv,
-      "A tool to detect the presence of NVIDIA devices on the system. \n\n"
-      "The tool will output each detected GPU architecture separated by a\n"
-      "newline character. If multiple GPUs of the same architecture are found\n"
-      "a string will be printed for each\n");
-
-  if (Help) {
-    cl::PrintHelpMessage();
-    return 0;
-  }
-
+int printGPUsByCUDA() {
   // Attempt to load the NVPTX driver runtime.
   if (llvm::Error Err = loadCUDA()) {
     logAllUnhandledErrors(std::move(Err), llvm::errs());

clang/tools/nvptx-arch/CMakeLists.txt

@@ -0,0 +1,78 @@
+//===- OffloadArch.cpp - list available GPUs ------------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/Version.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Path.h"
+
+using namespace llvm;
+
+static cl::opt<bool> Help("h", cl::desc("Alias for -help"), cl::Hidden);
+
+// Mark all our options with this category.
+static cl::OptionCategory OffloadArchCategory("amdgpu-arch options");
+
+cl::opt<bool> Verbose("verbose", cl::desc("Enable verbose output"),
+                      cl::init(false), cl::cat(OffloadArchCategory));
+
+cl::opt<bool> AMDGPU("amdgpu-only", cl::desc("Print only AMD GPUs"),
+                     cl::init(false), cl::cat(OffloadArchCategory));
+
+cl::opt<bool> NVPTX("nvptx-only", cl::desc("Print only NVIDIA GPUs"),
+                    cl::init(false), cl::cat(OffloadArchCategory));
+
+static void PrintVersion(raw_ostream &OS) {
+  OS << clang::getClangToolFullVersion("offload-arch") << '\n';
+}
+
+int printGPUsByKFD();
+int printGPUsByHIP();
+int printGPUsByCUDA();
+
+int printAMD() {
+#ifndef _WIN32
+  if (!printGPUsByKFD())
+    return 0;
+#endif
+
+  return printGPUsByHIP();
+}
+
+int printNVIDIA() { return printGPUsByCUDA(); }
+
+int main(int argc, char *argv[]) {
+  cl::HideUnrelatedOptions(OffloadArchCategory);
+
+  cl::SetVersionPrinter(PrintVersion);
+  cl::ParseCommandLineOptions(
+      argc, argv,
+      "A tool to detect the presence of offloading devices on the system. \n\n"
+      "The tool will output each detected GPU architecture separated by a\n"
+      "newline character. If multiple GPUs of the same architecture are found\n"
+      "a string will be printed for each\n");
+
+  if (Help) {
+    cl::PrintHelpMessage();
+    return 0;
+  }
+
+  // If this was invoked from the legacy symlinks provide the same behavior.
+  bool AMDGPUOnly = AMDGPU || sys::path::filename(argv[0]) == "amdgpu-arch";
+  bool NVIDIAOnly = NVPTX || sys::path::filename(argv[0]) == "nvptx-arch";
+
+  int NVIDIAResult = 0;
+  if (!AMDGPUOnly)
+    NVIDIAResult = printNVIDIA();
+
+  int AMDResult = 0;
+  if (!NVIDIAOnly)
+    AMDResult = printAMD();
+
+  // We only failed if all cases returned an error.
+  return AMDResult && NVIDIAResult;
+}