OLD | NEW |
(Empty) | |
| 1 // Copyright 2017 the V8 project authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef V8_WASM_CODE_SPECIALIZATION_H_ |
| 6 #define V8_WASM_CODE_SPECIALIZATION_H_ |
| 7 |
| 8 #include "src/assembler.h" |
| 9 #include "src/identity-map.h" |
| 10 #include "src/wasm/wasm-objects.h" |
| 11 |
| 12 namespace v8 { |
| 13 namespace internal { |
| 14 namespace wasm { |
| 15 |
| 16 // Helper class to specialize wasm code for a specific instance, or to update |
| 17 // code when memory / globals / tables change. |
| 18 // This class in unhandlified, and contains a DisallowHeapAllocation field to |
| 19 // ensure that no allocations happen while it is alive. |
| 20 // |
| 21 // Set up all relocations / patching that should be performed by the Relocate* / |
| 22 // Patch* methods, then apply all changes in one step using the Apply* methods. |
| 23 class CodeSpecialization { |
| 24 public: |
| 25 CodeSpecialization(Isolate*, Zone*); |
| 26 ~CodeSpecialization(); |
| 27 |
| 28 // Update memory references. |
| 29 void RelocateMemoryReferences(Address old_start, uint32_t old_size, |
| 30 Address new_start, uint32_t new_size); |
| 31 // Update references to global variables. |
| 32 void RelocateGlobals(Address old_start, Address new_start); |
| 33 // Update function table size. |
| 34 // TODO(wasm): Prepare this for more than one indirect function table. |
| 35 void PatchTableSize(uint32_t old_size, uint32_t new_size); |
| 36 // Update all direct call sites based on the code table in the given instance. |
| 37 void RelocateDirectCalls(Handle<WasmInstanceObject> instance); |
| 38 // Relocate an arbitrary object (e.g. function table). |
| 39 void RelocateObject(Handle<Object> old_obj, Handle<Object> new_obj); |
| 40 |
| 41 // Apply all relocations and patching to all code in the instance (wasm code |
| 42 // and exported functions). |
| 43 bool ApplyToWholeInstance(WasmInstanceObject*, |
| 44 ICacheFlushMode = FLUSH_ICACHE_IF_NEEDED); |
| 45 // Apply all relocations and patching to one wasm code object. |
| 46 bool ApplyToWasmCode(Code*, ICacheFlushMode = FLUSH_ICACHE_IF_NEEDED); |
| 47 |
| 48 private: |
| 49 Address old_mem_start = 0; |
| 50 uint32_t old_mem_size = 0; |
| 51 Address new_mem_start = 0; |
| 52 uint32_t new_mem_size = 0; |
| 53 |
| 54 Address old_globals_start = 0; |
| 55 Address new_globals_start = 0; |
| 56 |
| 57 uint32_t old_function_table_size = 0; |
| 58 uint32_t new_function_table_size = 0; |
| 59 |
| 60 Handle<WasmInstanceObject> relocate_direct_calls_instance; |
| 61 |
| 62 bool has_objects_to_relocate = false; |
| 63 IdentityMap<Handle<Object>> objects_to_relocate; |
| 64 }; |
| 65 |
| 66 } // namespace wasm |
| 67 } // namespace internal |
| 68 } // namespace v8 |
| 69 |
| 70 #endif // V8_WASM_CODE_SPECIALIZATION_H_ |
OLD | NEW |