kc3-lang/angle/src/libANGLE/entry_points_utils.h

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• Hash : 74cf6a3a
  Author :
  Date : 2023-07-12T14:44:17
  

  Ensure lockless entry point validations only access private data
  
  Bug: angleproject:8224
  Change-Id: I19e867923b088879f9f37d0a3b4ff8b681470be0
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4678352
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Reviewed-by: Charlie Lao <cclao@google.com>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/libANGLE/entry_points_utils.h

• //
  // Copyright 2018 The ANGLE 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.
  //
  // entry_point_utils:
  //   These helpers are used in GL/GLES entry point routines.
  
  #ifndef LIBANGLE_ENTRY_POINT_UTILS_H_
  #define LIBANGLE_ENTRY_POINT_UTILS_H_
  
  #include "angle_gl.h"
  #include "common/Optional.h"
  #include "common/PackedEnums.h"
  #include "common/angleutils.h"
  #include "common/entry_points_enum_autogen.h"
  #include "common/mathutil.h"
  #include "libANGLE/Context.h"
  #include "libANGLE/Display.h"
  
  namespace gl
  {
  // A template struct for determining the default value to return for each entry point.
  template <angle::EntryPoint EP, typename ReturnType>
  struct DefaultReturnValue;
  
  // Default return values for each basic return type.
  template <angle::EntryPoint EP>
  struct DefaultReturnValue<EP, GLint>
  {
      static constexpr GLint kValue = -1;
  };
  
  // This doubles as the GLenum return value.
  template <angle::EntryPoint EP>
  struct DefaultReturnValue<EP, GLuint>
  {
      static constexpr GLuint kValue = 0;
  };
  
  template <angle::EntryPoint EP>
  struct DefaultReturnValue<EP, GLboolean>
  {
      static constexpr GLboolean kValue = GL_FALSE;
  };
  
  template <angle::EntryPoint EP>
  struct DefaultReturnValue<EP, ShaderProgramID>
  {
      static constexpr ShaderProgramID kValue = {0};
  };
  
  // Catch-all rules for pointer types.
  template <angle::EntryPoint EP, typename PointerType>
  struct DefaultReturnValue<EP, const PointerType *>
  {
      static constexpr const PointerType *kValue = nullptr;
  };
  
  template <angle::EntryPoint EP, typename PointerType>
  struct DefaultReturnValue<EP, PointerType *>
  {
      static constexpr PointerType *kValue = nullptr;
  };
  
  // Overloaded to return invalid index
  template <>
  struct DefaultReturnValue<angle::EntryPoint::GLGetUniformBlockIndex, GLuint>
  {
      static constexpr GLuint kValue = GL_INVALID_INDEX;
  };
  
  // Specialized enum error value.
  template <>
  struct DefaultReturnValue<angle::EntryPoint::GLClientWaitSync, GLenum>
  {
      static constexpr GLenum kValue = GL_WAIT_FAILED;
  };
  
  // glTestFenceNV should still return TRUE for an invalid fence.
  template <>
  struct DefaultReturnValue<angle::EntryPoint::GLTestFenceNV, GLboolean>
  {
      static constexpr GLboolean kValue = GL_TRUE;
  };
  
  template <angle::EntryPoint EP, typename ReturnType>
  constexpr ANGLE_INLINE ReturnType GetDefaultReturnValue()
  {
      return DefaultReturnValue<EP, ReturnType>::kValue;
  }
  
  #if ANGLE_CAPTURE_ENABLED
  #    define ANGLE_CAPTURE_GL(Func, ...) CaptureGLCallToFrameCapture(Capture##Func, __VA_ARGS__)
  #else
  #    define ANGLE_CAPTURE_GL(...)
  #endif  // ANGLE_CAPTURE_ENABLED
  
  #define EGL_EVENT(EP, FMT, ...) EVENT(nullptr, EGL##EP, FMT, ##__VA_ARGS__)
  
  inline int CID(const Context *context)
  {
      return context == nullptr ? 0 : static_cast<int>(context->id().value);
  }
  
  bool GeneratePixelLocalStorageActiveError(const PrivateState &state,
                                            ErrorSet *errors,
                                            angle::EntryPoint entryPoint);
  
  ANGLE_INLINE bool ValidatePixelLocalStorageInactive(const PrivateState &state,
                                                      ErrorSet *errors,
                                                      angle::EntryPoint entryPoint)
  {
      return state.getPixelLocalStorageActivePlanes() == 0 ||
             GeneratePixelLocalStorageActiveError(state, errors, entryPoint);
  }
  }  // namespace gl
  
  namespace egl
  {
  inline int CID(EGLDisplay display, EGLContext context)
  {
      const egl::Display *displayPtr = reinterpret_cast<const egl::Display *>(display);
      if (!Display::isValidDisplay(displayPtr))
      {
          return -1;
      }
      gl::ContextID contextID = {static_cast<GLuint>(reinterpret_cast<uintptr_t>(context))};
      if (!displayPtr->isValidContext(contextID))
      {
          return -1;
      }
      return contextID.value;
  }
  
  #if ANGLE_CAPTURE_ENABLED
  #    define ANGLE_CAPTURE_EGL(Func, ...) CaptureEGLCallToFrameCapture(Capture##Func, __VA_ARGS__)
  #else
  #    define ANGLE_CAPTURE_EGL(...)
  #endif  // ANGLE_CAPTURE_ENABLED
  }  // namespace egl
  
  #endif  // LIBANGLE_ENTRY_POINT_UTILS_H_
  

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