[wasm] Implement frame inspection for interpreted frames

src/wasm/wasm-objects.h

 // 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.
 
 #ifndef V8_WASM_OBJECTS_H_
 #define V8_WASM_OBJECTS_H_
 
 #include "src/debug/debug.h"
 #include "src/debug/interface-types.h"
 #include "src/objects-inl.h"
 #include "src/trap-handler/trap-handler.h"
 #include "src/wasm/managed.h"
 #include "src/wasm/wasm-limits.h"
 
 namespace v8 {
 namespace internal {
 namespace wasm {
+class InterpretedFrame;
 struct WasmModule;
 }
 
 class WasmCompiledModule;
 class WasmDebugInfo;
 class WasmInstanceObject;
 class WasmInstanceWrapper;
 
 #define DECLARE_CASTS(name)             \
   static bool Is##name(Object* object); \
@@ skipping 360 matching lines @@
 
   // Set a breakpoint on the given byte position inside the given module.
   // This will affect all live and future instances of the module.
   // The passed position might be modified to point to the next breakable
   // location inside the same function.
   // If it points outside a function, or behind the last breakable location,
   // this function returns false and does not set any breakpoint.
   static bool SetBreakPoint(Handle<WasmCompiledModule>, int* position,
                             Handle<Object> break_point_object);
 
+  // Return an empty handle if no breakpoint is hit at that location, or a
+  // FixedArray with all hit breakpoint objects.
+  MaybeHandle<FixedArray> CheckBreakPoints(int position);
+
  private:
   void InitId();
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(WasmCompiledModule);
 };
 
 class WasmDebugInfo : public FixedArray {
  public:
   enum Fields {
     kInstance,
     kInterpreterHandle,
     kInterpretedFunctions,
     kFieldCount
   };
 
   static Handle<WasmDebugInfo> New(Handle<WasmInstanceObject>);
 
   static bool IsDebugInfo(Object*);
   static WasmDebugInfo* cast(Object*);
 
   static void SetBreakpoint(Handle<WasmDebugInfo>, int func_index, int offset);
 
-  static void RunInterpreter(Handle<WasmDebugInfo>, int func_index,
-                             uint8_t* arg_buffer);
+  void RunInterpreter(int func_index, uint8_t* arg_buffer);
+
+  // Get the stack of the wasm interpreter as pairs of <function index, byte
+  // offset>. The list is ordered bottom-to-top, i.e. caller before callee.
+  std::vector<std::pair<uint32_t, int>> GetInterpretedStack(
+      Address frame_pointer);
+
+  std::unique_ptr<wasm::InterpretedFrame> GetInterpretedFrame(
+      Address frame_pointer, int idx);
 
   DECLARE_GETTER(wasm_instance, WasmInstanceObject);
 };
 
 class WasmInstanceWrapper : public FixedArray {
  public:
   static Handle<WasmInstanceWrapper> New(Isolate* isolate,
                                          Handle<WasmInstanceObject> instance);
   static WasmInstanceWrapper* cast(Object* fixed_array) {
     SLOW_DCHECK(IsWasmInstanceWrapper(fixed_array));
@@ skipping 46 matching lines @@
   };
 };
 
 #undef DECLARE_ACCESSORS
 #undef DECLARE_OPTIONAL_ACCESSORS
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_OBJECTS_H_