[llvm] Reland [CGData] llvm-cgdata #89884 (PR #101461)

[Fangrui Song via llvm-commits]

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@@ -0,0 +1,352 @@
+//===-- 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/Object/Binary.h"
+#include "llvm/Option/ArgList.h"
+#include "llvm/Option/Option.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;
+
+enum CGDataFormat {
+  Invalid,
+  Text,
+  Binary,
+};
+
+enum CGDataAction {
+  Convert,
+  Merge,
+  Show,
+};
+
+// Command-line option boilerplate.
+namespace {
+enum ID {
+  OPT_INVALID = 0, // This is not an option ID.
+#define OPTION(...) LLVM_MAKE_OPT_ID(__VA_ARGS__),
+#include "Opts.inc"
+#undef OPTION
+};
+
+#define PREFIX(NAME, VALUE)                                                    \
+  static constexpr StringLiteral NAME##_init[] = VALUE;                        \
+  static constexpr ArrayRef<StringLiteral> NAME(NAME##_init,                   \
+                                                std::size(NAME##_init) - 1);
+#include "Opts.inc"
+#undef PREFIX
+
+using namespace llvm::opt;
+static constexpr opt::OptTable::Info InfoTable[] = {
+#define OPTION(...) LLVM_CONSTRUCT_OPT_INFO(__VA_ARGS__),
+#include "Opts.inc"
+#undef OPTION
+};
+
+class CGDataOptTable : public opt::GenericOptTable {
+public:
+  CGDataOptTable() : GenericOptTable(InfoTable) {}
+};
+} // end anonymous namespace
+
+// Options
+static std::string ToolName;
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MaskRay wrote:

StringRef can typically be used if the string is backed by other storage (argv, etc), which also avoids a global destructor.

https://github.com/llvm/llvm-project/pull/101461