Adds `-ftime-trace` option to clang that produces Chrome `chrome://tracing` compatible JSON profiling output dumps.
This change adds hierarchical "time trace" profiling blocks that can be visualized in Chrome, in a "flame chart" style. Each profiling block can have a "detail" string that for example indicates the file being processed, template name being instantiated, function being optimized etc.
This is taken from GitHub PR: https://github.com/aras-p/llvm-project-20170507/pull/2
Patch by Aras Pranckevičius.
Differential Revision: https://reviews.llvm.org/D58675
llvm-svn: 357340
diff --git a/clang/lib/Sema/SemaTemplateInstantiate.cpp b/clang/lib/Sema/SemaTemplateInstantiate.cpp
index bc4d9e0..a7d03dd 100644
--- a/clang/lib/Sema/SemaTemplateInstantiate.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiate.cpp
@@ -25,6 +25,7 @@
#include "clang/Sema/Template.h"
#include "clang/Sema/TemplateDeduction.h"
#include "clang/Sema/TemplateInstCallback.h"
+#include "llvm/Support/TimeProfiler.h"
using namespace clang;
using namespace sema;
@@ -2008,6 +2009,11 @@
Instantiation->getInstantiatedFromMemberClass(),
Pattern, PatternDef, TSK, Complain))
return true;
+
+ llvm::TimeTraceScope TimeScope("InstantiateClass", [&]() {
+ return Instantiation->getQualifiedNameAsString();
+ });
+
Pattern = PatternDef;
// Record the point of instantiation.