[wasm] Make reported "lines" on stack frames 1-based

src/isolate.cc

 // Copyright 2012 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/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 688 matching lines @@
   Handle<JSObject> NewStackFrameObject(WasmFrame* frame) {
     Handle<JSObject> stack_frame =
         factory()->NewJSObject(isolate_->object_function());
 
     if (!function_key_.is_null()) {
       Handle<String> name = wasm::GetWasmFunctionName(
           isolate_, handle(frame->wasm_instance(), isolate_),
           frame->function_index());
       JSObject::AddProperty(stack_frame, function_key_, name, NONE);
     }
-    // Encode the function index as line number.
+    // Encode the function index as line number (1-based).
     if (!line_key_.is_null()) {
       JSObject::AddProperty(
           stack_frame, line_key_,
-          isolate_->factory()->NewNumberFromInt(frame->function_index()), NONE);
+          isolate_->factory()->NewNumberFromInt(frame->function_index() + 1),
+          NONE);
     }
-    // Encode the byte offset as column.
+    // Encode the byte offset as column (1-based).
     if (!column_key_.is_null()) {
       Code* code = frame->LookupCode();
       int offset = static_cast<int>(frame->pc() - code->instruction_start());
       int position = AbstractCode::cast(code)->SourcePosition(offset);
       // Make position 1-based.
       if (position >= 0) ++position;
       JSObject::AddProperty(stack_frame, column_key_,
                             isolate_->factory()->NewNumberFromInt(position),
                             NONE);
     }
@@ skipping 2762 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8