[PATCH] D86406: Speedup llvm-dwarfdump 3.9x

[Jan Kratochvil via Phabricator via llvm-commits]

jankratochvil updated this revision to Diff 287723.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D86406/new/

https://reviews.llvm.org/D86406

Files:
  llvm/include/llvm/Support/raw_ostream.h
  llvm/lib/Support/raw_ostream.cpp


Index: llvm/lib/Support/raw_ostream.cpp
===================================================================
--- llvm/lib/Support/raw_ostream.cpp
+++ llvm/lib/Support/raw_ostream.cpp
@@ -858,7 +858,9 @@
 }
 
 bool raw_fd_ostream::has_colors() const {
-  return sys::Process::FileDescriptorHasColors(FD);
+  if (!HasColors)
+    HasColors = sys::Process::FileDescriptorHasColors(FD);
+  return *HasColors;
 }
 
 Expected<sys::fs::FileLocker> raw_fd_ostream::lock() {
Index: llvm/include/llvm/Support/raw_ostream.h
===================================================================
--- llvm/include/llvm/Support/raw_ostream.h
+++ llvm/include/llvm/Support/raw_ostream.h
@@ -412,6 +412,7 @@
   int FD;
   bool ShouldClose;
   bool SupportsSeeking = false;
+  mutable Optional<bool> HasColors;
 
 #ifdef _WIN32
   /// True if this fd refers to a Windows console device. Mintty and other


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