[clang-tidy] Store checks profiling info as JSON files

Summary:
Continuation of D46504.

Example output:
```
  $ clang-tidy -enable-check-profile -store-check-profile=. -checks=-*,readability-function-size source.cpp
  $ # Note that there won't be timings table printed to the console.
  $ cat *.json
  {
  "file": "/path/to/source.cpp",
  "timestamp": "2018-05-16 16:13:18.717446360",
  "profile": {
    "time.clang-tidy.readability-function-size.wall": 1.0421266555786133e+00,
    "time.clang-tidy.readability-function-size.user": 9.2088400000005421e-01,
    "time.clang-tidy.readability-function-size.sys": 1.2418899999999974e-01
  }
  }
```

There are two arguments that control profile storage:

* `-store-check-profile=<prefix>`

  By default reports are printed in tabulated format to stderr. When this option
  is passed, these per-TU profiles are instead stored as JSON.
  If the prefix is not an absolute path, it is considered to be relative to the
  directory from where you have run :program:`clang-tidy`. All `.` and `..`
  patterns in the path are collapsed, and symlinks are resolved.

  Example:
  Let's suppose you have a source file named `example.cpp`, located in
  `/source` directory.

  * If you specify `-store-check-profile=/tmp`, then the profile will be saved
    to `/tmp/<timestamp>-example.cpp.json`

  * If you run :program:`clang-tidy` from within `/foo` directory, and specify
    `-store-check-profile=.`, then the profile will still be saved to
    `/foo/<timestamp>-example.cpp.json`

Reviewers: alexfh, sbenza, george.karpenkov, NoQ, aaron.ballman

Reviewed By: alexfh, george.karpenkov, aaron.ballman

Subscribers: Quuxplusone, JonasToth, aaron.ballman, llvm-commits, rja, Eugene.Zelenko, xazax.hun, mgrang, cfe-commits

Tags: #clang-tools-extra

Differential Revision: https://reviews.llvm.org/D46602

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@334101 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 2 deletions

diff --git a/clang-tidy/ClangTidy.cpp b/clang-tidy/ClangTidy.cpp
index ff205edd..f497fd74 100644
--- a/clang-tidy/ClangTidy.cpp
+++ b/clang-tidy/ClangTidy.cpp
@@ -363,7 +363,8 @@ ClangTidyASTConsumerFactory::CreateASTConsumer(
 
   std::unique_ptr<ClangTidyProfiling> Profiling;
   if (Context.getEnableProfiling()) {
-    Profiling = llvm::make_unique<ClangTidyProfiling>();
+    Profiling = llvm::make_unique<ClangTidyProfiling>(
+        Context.getProfileStorageParams());
     FinderOptions.CheckProfiling.emplace(Profiling->Records);
   }
 
@@ -492,7 +493,7 @@ void runClangTidy(clang::tidy::ClangTidyContext &Context,
                   const CompilationDatabase &Compilations,
                   ArrayRef<std::string> InputFiles,
                   llvm::IntrusiveRefCntPtr<vfs::FileSystem> BaseFS,
-                  bool EnableCheckProfile) {
+                  bool EnableCheckProfile, llvm::StringRef StoreCheckProfile) {
   ClangTool Tool(Compilations, InputFiles,
                  std::make_shared<PCHContainerOperations>(), BaseFS);
 
@@ -533,6 +534,7 @@ void runClangTidy(clang::tidy::ClangTidyContext &Context,
   Tool.appendArgumentsAdjuster(PerFileExtraArgumentsInserter);
   Tool.appendArgumentsAdjuster(PluginArgumentsRemover);
   Context.setEnableProfiling(EnableCheckProfile);
+  Context.setProfileStoragePrefix(StoreCheckProfile);
 
   ClangTidyDiagnosticConsumer DiagConsumer(Context);