[llvm] [CGData] llvm-cgdata (PR #89884)

[Ellis Hoag via llvm-commits]

================
@@ -0,0 +1,268 @@
+//===-- llvm-cgdata.cpp - LLVM CodeGen Data Tool --------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// llvm-cgdata parses raw codegen data embedded in compiled binary files, and
+// merges them into a single .cgdata file. It can also inspect and maninuplate
+// a .cgdata file. This .cgdata can contain various codegen data like outlining
+// information, and it can be used to optimize the code in the subsequent build.
+//
+//===----------------------------------------------------------------------===//
+#include "llvm/ADT/StringRef.h"
+#include "llvm/CodeGenData/CodeGenDataReader.h"
+#include "llvm/CodeGenData/CodeGenDataWriter.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/Object/Archive.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/LLVMDriver.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Support/WithColor.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+using namespace llvm::object;
+
+// TODO: https://llvm.org/docs/CommandGuide/llvm-cgdata.html has documentations
+// on each subcommand.
+cl::SubCommand DumpSubcommand(
+    "dump",
+    "Dump the (indexed) codegen data file in either text or binary format.");
+cl::SubCommand MergeSubcommand(
+    "merge", "Takes binary files having raw codegen data in custom sections, "
+             "and merge them into an index codegen data file.");
+cl::SubCommand
+    ShowSubcommand("show", "Show summary of the (indexed) codegen data file.");
+
+enum CGDataFormat {
+  CD_None = 0,
+  CD_Text,
+  CD_Binary,
+};
+
+cl::opt<std::string> OutputFilename("output", cl::value_desc("output"),
+                                    cl::init("-"), cl::desc("Output file"),
+                                    cl::sub(DumpSubcommand),
+                                    cl::sub(MergeSubcommand));
+cl::alias OutputFilenameA("o", cl::desc("Alias for --output"),
+                          cl::aliasopt(OutputFilename));
+
+cl::opt<std::string> Filename(cl::Positional, cl::desc("<cgdata-file>"),
+                              cl::sub(DumpSubcommand), cl::sub(ShowSubcommand));
+cl::list<std::string> InputFilenames(cl::Positional, cl::sub(MergeSubcommand),
+                                     cl::desc("<binary-files...>"));
+cl::opt<CGDataFormat> OutputFormat(
+    cl::desc("Format of output data"), cl::sub(DumpSubcommand),
+    cl::init(CD_Text),
+    cl::values(clEnumValN(CD_Text, "text", "Text encoding"),
+               clEnumValN(CD_Binary, "binary", "Binary encoding")));
+
+cl::opt<bool> ShowCGDataVersion("cgdata-version", cl::init(false),
----------------
ellishg wrote:

Anything wrong with simply using `llvm-gcdata show --version`? Also, `false` should already be the default.

```suggestion
cl::opt<bool> ShowCGDataVersion("version",
```

https://github.com/llvm/llvm-project/pull/89884