From ad9f2263a15f0df8738ab64d49a5277d6d7d036e Mon Sep 17 00:00:00 2001
From: "kosak@google.com"
 <kosak@google.com@861a406c-534a-0410-8894-cb66d6ee9925>
Date: Mon, 17 Nov 2014 00:06:22 +0000
Subject: Reduce the stack frame size for CmpHelper* functions by moving the
 failure path into their own functions.

git-svn-id: http://googletest.googlecode.com/svn/trunk@693 861a406c-534a-0410-8894-cb66d6ee9925
---
 include/gtest/gtest.h | 40 +++++++++++++++++++++++++++++++---------
 1 file changed, 31 insertions(+), 9 deletions(-)

diff --git a/include/gtest/gtest.h b/include/gtest/gtest.h
index 38ca3e9..d7e3e26 100644
--- a/include/gtest/gtest.h
+++ b/include/gtest/gtest.h
@@ -1457,6 +1457,20 @@ std::string FormatForComparisonFailureMessage(
   return FormatForComparison<T1, T2>::Format(value);
 }
 
+// Separate the error generating code from the code path to reduce the stack
+// frame size of CmpHelperEQ. This helps reduce the overhead of some sanitizers
+// when calling EXPECT_* in a tight loop.
+template <typename T1, typename T2>
+AssertionResult CmpHelperEQFailure(const char* expected_expression,
+                                   const char* actual_expression,
+                                   const T1& expected, const T2& actual) {
+  return EqFailure(expected_expression,
+                   actual_expression,
+                   FormatForComparisonFailureMessage(expected, actual),
+                   FormatForComparisonFailureMessage(actual, expected),
+                   false);
+}
+
 // The helper function for {ASSERT|EXPECT}_EQ.
 template <typename T1, typename T2>
 AssertionResult CmpHelperEQ(const char* expected_expression,
@@ -1469,11 +1483,8 @@ GTEST_DISABLE_MSC_WARNINGS_PUSH_(4389 /* signed/unsigned mismatch */)
   }
 GTEST_DISABLE_MSC_WARNINGS_POP_()
 
-  return EqFailure(expected_expression,
-                   actual_expression,
-                   FormatForComparisonFailureMessage(expected, actual),
-                   FormatForComparisonFailureMessage(actual, expected),
-                   false);
+  return CmpHelperEQFailure(expected_expression, actual_expression, expected,
+                            actual);
 }
 
 // With this overloaded version, we allow anonymous enums to be used
@@ -1561,6 +1572,19 @@ class EqHelper<true> {
   }
 };
 
+// Separate the error generating code from the code path to reduce the stack
+// frame size of CmpHelperOP. This helps reduce the overhead of some sanitizers
+// when calling EXPECT_OP in a tight loop.
+template <typename T1, typename T2>
+AssertionResult CmpHelperOpFailure(const char* expr1, const char* expr2,
+                                   const T1& val1, const T2& val2,
+                                   const char* op) {
+  return AssertionFailure()
+         << "Expected: (" << expr1 << ") " << op << " (" << expr2
+         << "), actual: " << FormatForComparisonFailureMessage(val1, val2)
+         << " vs " << FormatForComparisonFailureMessage(val2, val1);
+}
+
 // A macro for implementing the helper functions needed to implement
 // ASSERT_?? and EXPECT_??.  It is here just to avoid copy-and-paste
 // of similar code.
@@ -1571,6 +1595,7 @@ class EqHelper<true> {
 // with gcc 4.
 //
 // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
+
 #define GTEST_IMPL_CMP_HELPER_(op_name, op)\
 template <typename T1, typename T2>\
 AssertionResult CmpHelper##op_name(const char* expr1, const char* expr2, \
@@ -1578,10 +1603,7 @@ AssertionResult CmpHelper##op_name(const char* expr1, const char* expr2, \
   if (val1 op val2) {\
     return AssertionSuccess();\
   } else {\
-    return AssertionFailure() \
-        << "Expected: (" << expr1 << ") " #op " (" << expr2\
-        << "), actual: " << FormatForComparisonFailureMessage(val1, val2)\
-        << " vs " << FormatForComparisonFailureMessage(val2, val1);\
+    return CmpHelperOpFailure(expr1, expr2, val1, val2, #op);\
   }\
 }\
 GTEST_API_ AssertionResult CmpHelper##op_name(\
-- 
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