[llvm] WIP: [Offload] Add testing for Offload program and kernel related entry points (PR #127803)

[Joseph Huber via llvm-commits]

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@@ -94,3 +95,53 @@ ol_platform_handle_t TestEnvironment::getPlatform() {
 
   return Platform;
 }
+
+// TODO: Define via cmake, also override via cmd line arg
+const std::string DeviceBinsDirectory = DEVICE_CODE_PATH;
+
+bool TestEnvironment::loadDeviceBinary(
+    const std::string &BinaryName, ol_platform_handle_t Platform,
+    std::shared_ptr<std::vector<char>> &BinaryOut) {
+
+  // Get the platform type
+  ol_platform_backend_t Backend = OL_PLATFORM_BACKEND_UNKNOWN;
+  olGetPlatformInfo(Platform, OL_PLATFORM_INFO_BACKEND, sizeof(Backend),
+                    &Backend);
+  std::string FileExtension;
+  if (Backend == OL_PLATFORM_BACKEND_AMDGPU) {
+    FileExtension = ".amdgpu.bin";
+  } else if (Backend == OL_PLATFORM_BACKEND_CUDA) {
+    FileExtension = ".nvptx64.bin";
+  } else {
+    errs() << "Unsupported platform type for a device binary test.\n";
+    return false;
+  }
+
+  std::string SourcePath =
+      DeviceBinsDirectory + "/" + BinaryName + FileExtension;
+
+  std::ifstream SourceFile;
+  SourceFile.open(SourcePath, std::ios::binary | std::ios::in | std::ios::ate);
+
+  if (!SourceFile.is_open()) {
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jhuber6 wrote:

`llvm::MemoryBuffer::getFileOrSTDIN` is much easier to use and is backed by `mmap()` i believe.

https://github.com/llvm/llvm-project/pull/127803