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// 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.
#ifndef V8_WASM_WASM_CODE_SPECIALIZATION_H_
#define V8_WASM_WASM_CODE_SPECIALIZATION_H_
#include "src/assembler.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 {
public:
CodeSpecialization();
~CodeSpecialization();
// Update instance references in code. Instance references should only
// appear in export wrappers.
void UpdateInstanceReferences(Handle<WeakCell> old_weak_instance,
Handle<WeakCell> new_weak_instance);
// Update all direct call sites based on the code table in the given instance.
void RelocateDirectCalls(NativeModule* module);
// Apply all relocations and patching to all code in the instance (wasm code
// and exported functions).
bool ApplyToWholeModule(NativeModule*,
ICacheFlushMode = FLUSH_ICACHE_IF_NEEDED);
// Apply all relocations and patching to one wasm code object.
bool ApplyToWasmCode(wasm::WasmCode*,
ICacheFlushMode = FLUSH_ICACHE_IF_NEEDED);
private:
Handle<WeakCell> old_weak_instance_;
Handle<WeakCell> new_weak_instance_;
NativeModule* relocate_direct_calls_module_ = nullptr;
};
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_WASM_CODE_SPECIALIZATION_H_
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