[coverage] Block coverage with support for IfStatements

test/unittests/interpreter/bytecode-array-builder-unittest.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/ast/scopes.h"
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/interpreter/bytecode-array-iterator.h"
 #include "src/interpreter/bytecode-jump-table.h"
@@ skipping 353 matching lines @@
   builder.CallRuntime(Runtime::kInlineIsArray, reg_list);
 
   // Emit debugger bytecode.
   builder.Debugger();
 
   // Insert dummy ops to force longer jumps.
   for (int i = 0; i < 256; i++) {
     builder.Debugger();
   }
 
+  // Emit block counter increments.
+  FLAG_block_coverage = true;  // Satisfy DCHECKs.

[rmcilroy, 2017/06/01 14:01:50]

This will unconditionally set the flag for all following unittests if they are
run in the same process. Please use the SaveFlags to save and restore the flags
at the start and end of this test.

[jgruber, 2017/06/02 06:39:27]

Done.

+  builder.IncBlockCounter(0);
+
   // Bind labels for long jumps at the very end.
   for (size_t i = 0; i < arraysize(end); i++) {
     builder.Bind(&end[i]);
   }
 
   // Return must be the last instruction.
   builder.Return();
 
   // Generate BytecodeArray.
   scope.SetScriptScopeInfo(factory->NewScopeInfo(1));
@@ skipping 444 matching lines @@
     iterator.Advance();
   }
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
   iterator.Advance();
   CHECK(iterator.done());
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8