[wasm] Allocate a single script per wasm module

test/mjsunit/wasm/frame-inspection.js

 // Copyright 2016 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.
 
 // Flags: --expose-wasm --expose-debug-as debug
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 Debug = debug.Debug
 
 var exception = null;
 var break_count = 0;
 
-const expected_num_frames = 5;
-const expected_wasm_frames = [false, true, true, false, false];
-const expected_wasm_positions = [0, 1, 2, 0, 0];
-const expected_function_names = ["call_debugger", "wasm_2", "wasm_1", "testFrameInspection", ""];
+const expected_frames = [
+  // func-name; wasm?; pos; line; col
+  ['call_debugger', false],        // --
+  ['wasm_2', true, 56, 2, 1],      // --
+  ['wasm_1', true, 52, 1, 2],      // --
+  ['testFrameInspection', false],  // --
+  ['', false]
+];
 
 function listener(event, exec_state, event_data, data) {
   if (event != Debug.DebugEvent.Break) return;
   ++break_count;
   try {
     var break_id = exec_state.break_id;
     var frame_count = exec_state.frameCount();
-    assertEquals(expected_num_frames, frame_count);
+    assertEquals(expected_frames.length, frame_count, 'frame count');
 
     for (var i = 0; i < frame_count; ++i) {
       var frame = exec_state.frame(i);
+      assertEquals(expected_frames[i][0], frame.func().name(), 'name at ' + i);
       // wasm frames have unresolved function, others resolved ones.
-      assertEquals(expected_wasm_frames[i], !frame.func().resolved());
-      assertEquals(expected_function_names[i], frame.func().name());
-      if (expected_wasm_frames[i]) {
+      assertEquals(
+          expected_frames[i][1], !frame.func().resolved(), 'resolved at ' + i);
+      if (expected_frames[i][1]) {  // wasm frame?
         var script = frame.details().script();
-        assertNotNull(script);
-        assertEquals(expected_wasm_positions[i], frame.details().sourcePosition());
+        assertNotNull(script, 'script at ' + i);
+        assertEquals(
+            expected_frames[i][2], frame.details().sourcePosition(),
+            'source pos at ' + i);
         var loc = script.locationFromPosition(frame.details().sourcePosition());
-        assertEquals(expected_wasm_positions[i], loc.column);
-        assertEquals(expected_wasm_positions[i], loc.position);
+        assertEquals(expected_frames[i][2], loc.position, 'pos at ' + i);
+        assertEquals(expected_frames[i][3], loc.line, 'line at ' + i);
+        assertEquals(expected_frames[i][4], loc.column, 'column at ' + i);
       }
     }
   } catch (e) {
     exception = e;
   }
 };
 
 var builder = new WasmModuleBuilder();
 
 // wasm_1 calls wasm_2 on offset 2.
 // wasm_2 calls call_debugger on offset 1.
 
-builder.addImport("func", kSig_v_v);
+builder.addImport('func', kSig_v_v);
 
-builder.addFunction("wasm_1", kSig_v_v)
-  .addBody([kExprNop, kExprCallFunction, 2])
-  .exportAs("main");
+builder.addFunction('wasm_1', kSig_v_v)
+    .addBody([kExprNop, kExprCallFunction, 2])
+    .exportAs('main');
 
-builder.addFunction("wasm_2", kSig_v_v)
-  .addBody([kExprCallFunction, 0]);
+builder.addFunction('wasm_2', kSig_v_v).addBody([kExprCallFunction, 0]);
 
 function call_debugger() {
   debugger;
 }
 
 var module = builder.instantiate({func: call_debugger});
 
 (function testFrameInspection() {
   Debug.setListener(listener);
   module.exports.main();
   Debug.setListener(null);
 
   assertEquals(1, break_count);
   if (exception) throw exception;
 })();