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// Copyright 2020 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_HEAP_CPPGC_STACK_H_
#define V8_HEAP_CPPGC_STACK_H_
#include "src/base/macros.h"
// TODO(chromium:1056170): Implement all platforms.
#if defined(V8_TARGET_ARCH_X64)
#define CPPGC_SUPPORTS_CONSERVATIVE_STACK_SCAN 1
#endif
namespace cppgc {
namespace internal {
class StackVisitor {
public:
virtual void VisitPointer(const void* address) = 0;
};
// Abstraction over the stack. Supports handling of:
// - native stack;
// - ASAN/MSAN;
// - SafeStack: https://releases.llvm.org/10.0.0/tools/clang/docs/SafeStack.html
class V8_EXPORT_PRIVATE Stack final {
public:
explicit Stack(const void* stack_start);
// Returns true if |slot| is part of the stack and false otherwise.
bool IsOnStack(void* slot) const;
// Word-aligned iteration of the stack. Slot values are passed on to
// |visitor|.
#ifdef CPPGC_SUPPORTS_CONSERVATIVE_STACK_SCAN
void IteratePointers(StackVisitor* visitor) const;
#endif // CPPGC_SUPPORTS_CONSERVATIVE_STACK_SCAN
private:
void IteratePointersImpl(StackVisitor* visitor, intptr_t* stack_end) const;
const void* stack_start_;
};
} // namespace internal
} // namespace cppgc
#endif // V8_HEAP_CPPGC_STACK_H_
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