C++ ActRec::getThis方法代码示例

void Injection::execute() const {
  if (m_builtin) {
    ASSERT(m_callback);
    // Execute function in runtime
    m_callback(m_arg);
    return;
  }
  // Execute php code piece
  TypedValue retval;
  VarEnv *varEnv = NULL;
  ActRec *cfpSave = NULL;
  ObjectData *this_ = NULL;
  Class *cls = NULL;
  ActRec *fp = g_vmContext->getFP();
  if (fp) {
    if (!fp->hasVarEnv()) {
      fp->m_varEnv = VarEnv::createLazyAttach(fp);
    }
    varEnv = fp->m_varEnv;
    cfpSave = varEnv->getCfp();
    if (fp->hasThis()) {
      this_ = fp->getThis();
    } else if (fp->hasClass()) {
      cls = fp->getClass();
    }
  }
  // Note: For now we don't merge analysis code's class and function.
  // Later we might decide to do so
  g_vmContext->invokeFunc(&retval, m_unit->getMain(), Array::Create(), this_,
                          cls, varEnv, NULL, NULL);
  if (varEnv) {
    varEnv->setCfp(cfpSave);
  }
}

Variant f_get_called_class() {
  EagerCallerFrame cf;
  ActRec* ar = cf();
  if (ar) {
    if (ar->hasThis()) return Variant(ar->getThis()->o_getClassName());
    if (ar->hasClass()) return Variant(ar->getClass()->preClass()->name());
  }
  return Variant(false);
}

Variant f_get_called_class() {
  CallerFrame cf;
  ActRec* ar = cf();
  if (ar == NULL) {
    return Variant(false);
  }
  if (ar->hasThis()) {
    ObjectData* obj = ar->getThis();
    return obj->o_getClassName();
  } else if (ar->hasClass()) {
    return ar->getClass()->preClass()->name()->data();
  } else {
    return Variant(false);
  }
}

Variant HHVM_FUNCTION(get_called_class) {
  EagerCallerFrame cf;
  ActRec* ar = cf();
  if (ar) {
    if (ar->hasThis()) {
      return Variant(ar->getThis()->getClassName());
    }
    if (ar->hasClass()) {
      return Variant(ar->getClass()->preClass()->name(),
        Variant::StaticStrInit{});
    }
  }

  raise_warning("get_called_class() called from outside a class");
  return Variant(false);
}

Variant f_get_called_class() {
  if (hhvm) {
    CallerFrame cf;
    ActRec* ar = cf();
    if (ar == NULL) {
      return Variant(false);
    }
    if (ar->hasThis()) {
      ObjectData* obj = ar->getThis();
      return obj->o_getClassName();
    } else if (ar->hasClass()) {
      return ar->getClass()->preClass()->name()->data();
    } else {
      return Variant(false);
    }
  } else {
    CStrRef cls = FrameInjection::GetStaticClassName(
      ThreadInfo::s_threadInfo.getNoCheck());
    return cls.size() ? Variant(cls.get()) : Variant(false);
  }
}

//.........这里部分代码省略.........
      if (opAtPrevPc == Op::PopR ||
          opAtPrevPc == Op::UnboxR ||
          opAtPrevPc == Op::UnboxRNop) {
        pcAdjust = 1;
      }
      frame.set(s_line,
                prevFp->func()->unit()->getLineNumber(prevPc - pcAdjust));
    }

    // Check for include.
    String funcname{const_cast<StringData*>(fp->func()->name())};
    if (fp->func()->isClosureBody()) {
      // Strip the file hash from the closure name.
      String fullName{const_cast<StringData*>(fp->func()->baseCls()->name())};
      funcname = fullName.substr(0, fullName.find(';'));
    }

    // Check for pseudomain.
    if (funcname.empty()) {
      if (!prevFp && !btArgs.m_withPseudoMain) continue;
      else if (!prevFp) funcname = s_main;
      else funcname = s_include;
    }

    frame.set(s_function, funcname);

    if (!funcname.same(s_include)) {
      // Closures have an m_this but they aren't in object context.
      auto ctx = arGetContextClass(fp);
      if (ctx != nullptr && !fp->func()->isClosureBody()) {
        frame.set(s_class, Variant{const_cast<StringData*>(ctx->name())});
        if (fp->hasThis() && !isReturning) {
          if (btArgs.m_withThis) {
            frame.set(s_object, Object(fp->getThis()));
          }
          frame.set(s_type, s_arrow);
        } else {
          frame.set(s_type, s_double_colon);
        }
      }
    }

    bool const mayUseVV = fp->func()->attrs() & AttrMayUseVV;

    auto const withNames = btArgs.m_withArgNames;
    auto const withValues = btArgs.m_withArgValues;
    if (!btArgs.m_withArgNames && !btArgs.m_withArgValues) {
      // do nothing
    } else if (funcname.same(s_include)) {
      if (depth != 0) {
        auto filepath = const_cast<StringData*>(curUnit->filepath());
        frame.set(s_args, make_packed_array(filepath));
      }
    } else if (!RuntimeOption::EnableArgsInBacktraces || isReturning) {
      // Provide an empty 'args' array to be consistent with hphpc.
      frame.set(s_args, empty_array());
    } else {
      auto args = Array::Create();
      auto const nparams = fp->func()->numNonVariadicParams();
      auto const nargs = fp->numArgs();
      auto const nformals = std::min<int>(nparams, nargs);

      if (UNLIKELY(mayUseVV) &&
          UNLIKELY(fp->hasVarEnv() && fp->getVarEnv()->getFP() != fp)) {
        // VarEnv is attached to eval or debugger frame, other than the current
        // frame. Access locals thru VarEnv.

//.........这里部分代码省略.........
      frame.set(s_file, const_cast<StringData*>(prevFile));

      // In the normal method case, the "saved pc" for line number printing is
      // pointing at the cell conversion (Unbox/Pop) instruction, not the call
      // itself. For multi-line calls, this instruction is associated with the
      // subsequent line which results in an off-by-n. We're subtracting one
      // in order to look up the line associated with the FCall/FCallArray
      // instruction. Exception handling and the other opcodes (ex. BoxR)
      // already do the right thing. The emitter associates object access with
      // the subsequent expression and this would be difficult to modify.
      auto const opAtPrevPc =
        *reinterpret_cast<const Op*>(prevUnit->at(prevPc));
      Offset pcAdjust = 0;
      if (opAtPrevPc == OpPopR || opAtPrevPc == OpUnboxR) {
        pcAdjust = 1;
      }
      frame.set(s_line,
                prevFp->m_func->unit()->getLineNumber(prevPc - pcAdjust));
    }

    // check for include
    String funcname = const_cast<StringData*>(fp->m_func->name());
    if (fp->m_func->isClosureBody()) {
      static StringData* s_closure_label =
        makeStaticString("{closure}");
      funcname = s_closure_label;
    }

    // check for pseudomain
    if (funcname.empty()) {
      if (!prevFp) continue;
      funcname = s_include;
    }

    frame.set(s_function, funcname);

    if (!funcname.same(s_include)) {
      // Closures have an m_this but they aren't in object context
      Class* ctx = arGetContextClass(fp);
      if (ctx != nullptr && !fp->m_func->isClosureBody()) {
        frame.set(s_class, ctx->name()->data());
        if (fp->hasThis() && !isReturning) {
          if (btArgs.m_withThis) {
            frame.set(s_object, Object(fp->getThis()));
          }
          frame.set(s_type, "->");
        } else {
          frame.set(s_type, "::");
        }
      }
    }

    Array args = Array::Create();
    if (btArgs.m_ignoreArgs) {
      // do nothing
    } else if (funcname.same(s_include)) {
      if (depth) {
        args.append(const_cast<StringData*>(curUnit->filepath()));
        frame.set(s_args, args);
      }
    } else if (!RuntimeOption::EnableArgsInBacktraces || isReturning) {
      // Provide an empty 'args' array to be consistent with hphpc
      frame.set(s_args, args);
    } else {
      const int nparams = fp->m_func->numNonVariadicParams();
      int nargs = fp->numArgs();
      int nformals = std::min(nparams, nargs);

      if (UNLIKELY(fp->hasVarEnv() && fp->getVarEnv()->getFP() != fp)) {
        // VarEnv is attached to eval or debugger frame, other than the current
        // frame. Access locals thru VarEnv.
        auto varEnv = fp->getVarEnv();
        auto func = fp->func();
        for (int i = 0; i < nformals; i++) {
          TypedValue *arg = varEnv->lookup(func->localVarName(i));
          args.append(tvAsVariant(arg));
        }
      } else {
        for (int i = 0; i < nformals; i++) {
          TypedValue *arg = frame_local(fp, i);
          args.append(tvAsVariant(arg));
        }
      }

      /* builtin extra args are not stored in varenv */
      if (nargs > nparams && fp->hasExtraArgs()) {
        for (int i = nparams; i < nargs; i++) {
          TypedValue *arg = fp->getExtraArg(i - nparams);
          args.append(tvAsVariant(arg));
        }
      }
      frame.set(s_args, args);
    }

    bt.append(frame.toVariant());
    depth++;
  }
  return bt;

}