[coverage] Block coverage with support for IfStatements

src/interpreter/interpreter-generator.cc

Index: src/interpreter/interpreter-generator.cc
diff --git a/src/interpreter/interpreter-generator.cc b/src/interpreter/interpreter-generator.cc
index a9e5233909baebf58df92ca16a2e432fb5f8d69d..f25f99d28da2076114a2d6def849cafb141292dc 100644
--- a/src/interpreter/interpreter-generator.cc
+++ b/src/interpreter/interpreter-generator.cc
@@ -3143,6 +3143,20 @@ IGNITION_HANDLER(Debugger, InterpreterAssembler) {
 DEBUG_BREAK_BYTECODE_LIST(DEBUG_BREAK);
 #undef DEBUG_BREAK
 
+// IncBlockCounter <slot>
+//
+// Increment the execution count for the given slot. Used for block code
+// coverage.
+IGNITION_HANDLER(IncBlockCounter, InterpreterAssembler) {
+  Node* feedback_vector = LoadFeedbackVector();
+  Node* slot = BytecodeOperandImmSmi(0);

[rmcilroy, 2017/05/18 14:17:59]

nit - slot -> coverage_array_slot (to avoid confusion with feedback_vector
slot).

[jgruber, 2017/05/22 09:43:32]

Done.

+  Node* context = GetContext();
+
+  CallRuntime(Runtime::kIncBlockCounter, context, feedback_vector, slot);
+
+  Dispatch();
+}
+
 class InterpreterForInPrepareAssembler : public InterpreterAssembler {
  public:
   InterpreterForInPrepareAssembler(CodeAssemblerState* state, Bytecode bytecode,