[coverage] Block coverage with support for IfStatements

src/parsing/parser-base.h

Index: src/parsing/parser-base.h
diff --git a/src/parsing/parser-base.h b/src/parsing/parser-base.h
index 3f006b4bb6aaa3b12e329a824789005dc4959f8b..999173f4c66673d196391a3b365ce3ee38c51f6f 100644
--- a/src/parsing/parser-base.h
+++ b/src/parsing/parser-base.h
@@ -83,6 +83,41 @@ struct FormalParametersBase {
   int arity = 0;
 };
 
+// Stack-allocated scope to collect source ranges from the parser.
+class SourceRangeScope final {
+ public:
+  enum PositionKind {
+    POSITION,
+    PEEK_POS,
+  };
+
+  SourceRangeScope(Scanner* scanner, SourceRange* range,
+                   PositionKind pre_kind = PEEK_POS,
+                   PositionKind post_kind = POSITION)
+      : scanner_(scanner), range_(range), post_kind_(post_kind) {
+    range_->start = GetPosition(pre_kind);
+  }
+
+  ~SourceRangeScope() { range_->end = GetPosition(post_kind_); }
+
+ private:
+  int32_t GetPosition(PositionKind kind) {
+    switch (post_kind_) {
+      case POSITION:
+        return scanner_->location().beg_pos;
+      case PEEK_POS:
+        return scanner_->peek_location().beg_pos;
+      default:
+        UNREACHABLE();
+    }
+  }
+
+  Scanner* scanner_;
+  SourceRange* range_;
+  PositionKind post_kind_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(SourceRangeScope);
+};
 
 // ----------------------------------------------------------------------------
 // The CHECK_OK macro is a convenient macro to enforce error
@@ -5145,15 +5180,23 @@ typename ParserBase<Impl>::StatementT ParserBase<Impl>::ParseIfStatement(
   Expect(Token::LPAREN, CHECK_OK);
   ExpressionT condition = ParseExpression(true, CHECK_OK);
   Expect(Token::RPAREN, CHECK_OK);
-  StatementT then_statement = ParseScopedStatement(labels, CHECK_OK);
+
+  SourceRange then_range, else_range;
+  StatementT then_statement = impl()->NullStatement();
+  {
+    SourceRangeScope range_scope(scanner(), &then_range);
+    then_statement = ParseScopedStatement(labels, CHECK_OK);
+  }
+
   StatementT else_statement = impl()->NullStatement();
   if (Check(Token::ELSE)) {
+    SourceRangeScope range_scope(scanner(), &else_range);
     else_statement = ParseScopedStatement(labels, CHECK_OK);
   } else {
     else_statement = factory()->NewEmptyStatement(kNoSourcePosition);
   }
   return factory()->NewIfStatement(condition, then_statement, else_statement,
-                                   pos);
+                                   pos, then_range, else_range);
 }
 
 template <typename Impl>