[coverage] Block coverage with support for IfStatements

src/compilation-info.h

Index: src/compilation-info.h
diff --git a/src/compilation-info.h b/src/compilation-info.h
index bd05639aabfaf80316d2026ea26a43e1a278afd5..422826a592cb6d29fc26e827b60699830f8f2db6 100644
--- a/src/compilation-info.h
+++ b/src/compilation-info.h
@@ -19,6 +19,7 @@
 namespace v8 {
 namespace internal {
 
+class CoverageInfo;
 class DeclarationScope;
 class DeferredHandles;
 class FunctionLiteral;
@@ -51,6 +52,7 @@ class V8_EXPORT_PRIVATE CompilationInfo final {
     kBailoutOnUninitialized = 1 << 14,
     kOptimizeFromBytecode = 1 << 15,
     kLoopPeelingEnabled = 1 << 16,
+    kBlockCoverageEnabled = 1 << 17,
   };
 
   CompilationInfo(Zone* zone, ParseInfo* parse_info, Isolate* isolate,
@@ -179,6 +181,12 @@ class V8_EXPORT_PRIVATE CompilationInfo final {
 
   bool is_loop_peeling_enabled() const { return GetFlag(kLoopPeelingEnabled); }
 
+  void MarkAsBlockCoverageEnabled() { SetFlag(kBlockCoverageEnabled); }
+
+  bool is_block_coverage_enabled() const {
+    return GetFlag(kBlockCoverageEnabled);
+  }
+
   bool GeneratePreagedPrologue() const {
     // Generate a pre-aged prologue if we are optimizing for size, which
     // will make code old more aggressive. Only apply to Code::FUNCTION,
@@ -312,6 +320,12 @@ class V8_EXPORT_PRIVATE CompilationInfo final {
 
   SourcePositionTableBuilder::RecordingMode SourcePositionRecordingMode() const;
 
+  bool has_coverage_info() const { return !coverage_info_.is_null(); }
+  Handle<CoverageInfo> coverage_info() const { return coverage_info_; }
+  void set_coverage_info(Handle<CoverageInfo> coverage_info) {
+    coverage_info_ = coverage_info;
+  }
+
  private:
   // Compilation mode.
   // BASE is generated by the full codegen, optionally prepared for bailouts.
@@ -382,6 +396,10 @@ class V8_EXPORT_PRIVATE CompilationInfo final {
 
   Vector<const char> debug_name_;
 
+  // Encapsulates coverage information gathered by the bytecode generator.
+  // Needs to be stored on the shared function info once compilation completes.
+  Handle<CoverageInfo> coverage_info_;
+
   DISALLOW_COPY_AND_ASSIGN(CompilationInfo);
 };