Reland "[Remarks] Add -foptimization-record-passes to filter remark emission"

Currently we have -Rpass for filtering the remarks that are displayed as
diagnostics, but when using -fsave-optimization-record, there is no way
to filter the remarks while generating them.

This adds support for filtering remarks by passes using a regex.
Ex: `clang -fsave-optimization-record -foptimization-record-passes=inline`

will only emit the remarks coming from the pass `inline`.

This adds:

* `-fsave-optimization-record` to the driver
* `-opt-record-passes` to cc1
* `-lto-pass-remarks-filter` to the LTOCodeGenerator
* `--opt-remarks-passes` to lld
* `-pass-remarks-filter` to llc, opt, llvm-lto, llvm-lto2
* `-opt-remarks-passes` to gold-plugin

Differential Revision: https://reviews.llvm.org/D59268

Original llvm-svn: 355964

llvm-svn: 355984

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/LTO/LTO.cpp b/llvm/lib/LTO/LTO.cpp
index f6e34c5..99318c1 100644
--- a/llvm/lib/LTO/LTO.cpp
+++ b/llvm/lib/LTO/LTO.cpp
@@ -1312,6 +1312,7 @@ Error LTO::runThinLTO(AddStreamFn AddStream, NativeObjectCache Cache) {
 Expected<std::unique_ptr<ToolOutputFile>>
 lto::setupOptimizationRemarks(LLVMContext &Context,
                               StringRef LTORemarksFilename,
+                              StringRef LTORemarksPasses,
                               bool LTOPassRemarksWithHotness, int Count) {
   if (LTOPassRemarksWithHotness)
     Context.setDiagnosticsHotnessRequested(true);
@@ -1329,6 +1330,11 @@ lto::setupOptimizationRemarks(LLVMContext &Context,
     return errorCodeToError(EC);
   Context.setRemarkStreamer(
       llvm::make_unique<RemarkStreamer>(Filename, DiagnosticFile->os()));
+
+  if (!LTORemarksPasses.empty())
+    if (Error E = Context.getRemarkStreamer()->setFilter(LTORemarksPasses))
+      return std::move(E);
+
   DiagnosticFile->keep();
   return std::move(DiagnosticFile);
 }