gpu: Pull some variables onto the stack in the decoder

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // Copyright (c) 2012 The Chromium 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 "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 8940 matching lines @@
 }
 
 error::Error GLES2DecoderImpl::HandleVertexAttribIPointer(
     uint32_t immediate_data_size,
     const void* cmd_data) {
   if (!unsafe_es3_apis_enabled())
     return error::kUnknownCommand;
   const gles2::cmds::VertexAttribIPointer& c =
       *static_cast<const gles2::cmds::VertexAttribIPointer*>(cmd_data);
 
+  GLsizei offset = c.offset;
   if (!state_.bound_array_buffer.get() ||
       state_.bound_array_buffer->IsDeleted()) {
     if (state_.vertex_attrib_manager.get() ==
         state_.default_vertex_attrib_manager.get()) {
       LOCAL_SET_GL_ERROR(
           GL_INVALID_OPERATION,
           "glVertexAttribIPointer", "no array buffer bound");
       return error::kNoError;
-    } else if (c.offset != 0) {
+    } else if (offset != 0) {
       LOCAL_SET_GL_ERROR(
           GL_INVALID_OPERATION,
           "glVertexAttribIPointer", "client side arrays are not allowed");
       return error::kNoError;
     }
   }
 
   GLuint indx = c.indx;
   GLint size = c.size;
   GLenum type = c.type;
   GLsizei stride = c.stride;
-  GLsizei offset = c.offset;
   const void* ptr = reinterpret_cast<const void*>(offset);
   if (!validators_->vertex_attrib_i_type.IsValid(type)) {
     LOCAL_SET_GL_ERROR_INVALID_ENUM("glVertexAttribIPointer", type, "type");
     return error::kNoError;
   }
   if (size < 1 || size > 4) {
     LOCAL_SET_GL_ERROR(
         GL_INVALID_VALUE, "glVertexAttribIPointer", "size GL_INVALID_VALUE");
     return error::kNoError;
   }
@@ skipping 4150 matching lines @@
     uint32_t immediate_data_size,
     const void* cmd_data) {
   const gles2::cmds::WaitSyncTokenCHROMIUM& c =
       *static_cast<const gles2::cmds::WaitSyncTokenCHROMIUM*>(cmd_data);
 
   const gpu::CommandBufferNamespace kMinNamespaceId =
       gpu::CommandBufferNamespace::INVALID;
   const gpu::CommandBufferNamespace kMaxNamespaceId =
       gpu::CommandBufferNamespace::NUM_COMMAND_BUFFER_NAMESPACES;
 
-  const gpu::CommandBufferNamespace namespace_id =
-      ((c.namespace_id >= static_cast<int32_t>(kMinNamespaceId)) &&
-       (c.namespace_id < static_cast<int32_t>(kMaxNamespaceId)))
-          ? static_cast<gpu::CommandBufferNamespace>(c.namespace_id)
-          : gpu::CommandBufferNamespace::INVALID;
+  gpu::CommandBufferNamespace namespace_id =
+      static_cast<gpu::CommandBufferNamespace>(c.namespace_id);
+  if ((namespace_id < static_cast<int32_t>(kMinNamespaceId)) &&
+       (namespace_id >= static_cast<int32_t>(kMaxNamespaceId))) {
+    namespace_id = gpu::CommandBufferNamespace::INVALID;
+  }
   const CommandBufferId command_buffer_id =
       CommandBufferId::FromUnsafeValue(c.command_buffer_id());
   const uint64_t release = c.release_count();
   if (wait_fence_sync_callback_.is_null())
     return error::kNoError;
 
   return wait_fence_sync_callback_.Run(namespace_id, command_buffer_id, release)
              ? error::kNoError
              : error::kDeferCommandUntilLater;
 }
@@ skipping 1316 matching lines @@
       "mailbox[0]", static_cast<unsigned char>(data[0]));
 
   ProduceTextureRef("glProduceTextureDirectCHROMIUM", GetTexture(client_id),
       target, data);
 }
 
 void GLES2DecoderImpl::ProduceTextureRef(const char* func_name,
                                          TextureRef* texture_ref,
                                          GLenum target,
                                          const GLbyte* data) {
-  const Mailbox& mailbox = *reinterpret_cast<const Mailbox*>(data);
+  const Mailbox mailbox = *reinterpret_cast<const Mailbox*>(data);
   DLOG_IF(ERROR, !mailbox.Verify()) << func_name << " was passed a "
                                        "mailbox that was not generated by "
                                        "GenMailboxCHROMIUM.";
 
   if (!texture_ref) {
     LOCAL_SET_GL_ERROR(
         GL_INVALID_OPERATION, func_name, "unknown texture for target");
     return;
   }
 
@@ skipping 573 matching lines @@
     uint32_t immediate_data_size, const void* cmd_data) {
   if (!unsafe_es3_apis_enabled()) {
     return error::kUnknownCommand;
   }
   const gles2::cmds::MapBufferRange& c =
       *static_cast<const gles2::cmds::MapBufferRange*>(cmd_data);
   GLenum target = static_cast<GLenum>(c.target);
   GLbitfield access = static_cast<GLbitfield>(c.access);
   GLintptr offset = static_cast<GLintptr>(c.offset);
   GLsizeiptr size = static_cast<GLsizeiptr>(c.size);
+  uint32_t data_shm_id = static_cast<uint32_t>(c.data_shm_id);
 
   typedef cmds::MapBufferRange::Result Result;
   Result* result = GetSharedMemoryAs<Result*>(
       c.result_shm_id, c.result_shm_offset, sizeof(*result));
   if (!result) {
     return error::kOutOfBounds;
   }
   if (*result != 0) {
     *result = 0;
     return error::kInvalidArguments;
   }
   int8_t* mem =
-      GetSharedMemoryAs<int8_t*>(c.data_shm_id, c.data_shm_offset, size);
+      GetSharedMemoryAs<int8_t*>(data_shm_id, c.data_shm_offset, size);
   if (!mem) {
     return error::kOutOfBounds;
   }
 
   GLbitfield mask = GL_MAP_INVALIDATE_BUFFER_BIT;
   if ((access & mask) == mask) {
     // TODO(zmo): To be on the safe side, always map
     // GL_MAP_INVALIDATE_BUFFER_BIT to GL_MAP_INVALIDATE_RANGE_BIT.
     access = (access & ~GL_MAP_INVALIDATE_BUFFER_BIT);
     access = (access | GL_MAP_INVALIDATE_RANGE_BIT);
@@ skipping 11 matching lines @@
       (access & GL_MAP_INVALIDATE_RANGE_BIT) == 0) {
     access = (access | GL_MAP_READ_BIT);
   }
   void* ptr = glMapBufferRange(target, offset, size, access);
   if (ptr == nullptr) {
     return error::kNoError;
   }
   Buffer* buffer = buffer_manager()->GetBufferInfoForTarget(&state_, target);
   DCHECK(buffer);
   buffer->SetMappedRange(offset, size, access, ptr,
-                         GetSharedMemoryBuffer(c.data_shm_id));
+                         GetSharedMemoryBuffer(data_shm_id));
   if ((access & GL_MAP_INVALIDATE_RANGE_BIT) == 0) {
     memcpy(mem, ptr, size);
   }
   *result = 1;
   return error::kNoError;
 }
 
 error::Error GLES2DecoderImpl::HandleUnmapBuffer(
     uint32_t immediate_data_size, const void* cmd_data) {
   if (!unsafe_es3_apis_enabled()) {
@@ skipping 1191 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu