| // Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| #include "vm/dispatch_table.h" |
| |
| #include "platform/assert.h" |
| |
| namespace dart { |
| |
| intptr_t DispatchTable::OriginElement() { |
| #if defined(TARGET_ARCH_X64) |
| // Max negative byte offset / 8 |
| return 16; |
| #elif defined(TARGET_ARCH_ARM) |
| // Max negative load offset / 4 |
| return 1023; |
| #elif defined(TARGET_ARCH_ARM64) |
| // Max consecutive sub immediate value |
| return 4096; |
| #else |
| // No AOT on IA32 |
| UNREACHABLE(); |
| return 0; |
| #endif |
| } |
| |
| intptr_t DispatchTable::LargestSmallOffset() { |
| #if defined(TARGET_ARCH_X64) |
| // Origin + Max positive byte offset / 8 |
| return 31; |
| #elif defined(TARGET_ARCH_ARM) |
| // Origin + Max positive load offset / 4 |
| return 2046; |
| #elif defined(TARGET_ARCH_ARM64) |
| // Origin + Max consecutive add immediate value |
| return 8192; |
| #else |
| // No AOT on IA32 |
| UNREACHABLE(); |
| return 0; |
| #endif |
| } |
| |
| const uword* DispatchTable::ArrayOrigin() const { |
| return &array_.get()[OriginElement()]; |
| } |
| |
| } // namespace dart |