blob: 8f68677fbf8d2c9e17cbc0349c8e280330221509 [file] [log] [blame]
// Copyright 2017 the V8 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.
#include "src/assembler.h"
#include "src/identity-map.h"
#include "src/wasm/decoder.h"
#include "src/wasm/wasm-objects.h"
namespace v8 {
namespace internal {
namespace wasm {
uint32_t ExtractDirectCallIndex(wasm::Decoder& decoder, const byte* pc);
// Helper class to specialize wasm code for a specific instance, or to update
// code when memory / globals / tables change.
// This class in unhandlified, and contains a DisallowHeapAllocation field to
// ensure that no allocations happen while it is alive.
// Set up all relocations / patching that should be performed by the Relocate* /
// Patch* methods, then apply all changes in one step using the Apply* methods.
class CodeSpecialization {
CodeSpecialization(Isolate*, Zone*);
// Update WasmContext references.
void RelocateWasmContextReferences(Address new_context);
// Update function table size.
// TODO(wasm): Prepare this for more than one indirect function table.
void PatchTableSize(uint32_t old_size, uint32_t new_size);
// Update all direct call sites based on the code table in the given instance.
void RelocateDirectCalls(Handle<WasmInstanceObject> instance);
// Relocate an arbitrary object (e.g. function table).
void RelocatePointer(Address old_obj, Address new_obj);
// Apply all relocations and patching to all code in the instance (wasm code
// and exported functions).
bool ApplyToWholeInstance(WasmInstanceObject*,
// Apply all relocations and patching to one wasm code object.
bool ApplyToWasmCode(WasmCodeWrapper,
Isolate* isolate_;
Address new_wasm_context_address = 0;
uint32_t old_function_table_size = 0;
uint32_t new_function_table_size = 0;
Handle<WasmInstanceObject> relocate_direct_calls_instance;
std::map<Address, Address> pointers_to_relocate;
} // namespace wasm
} // namespace internal
} // namespace v8