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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_BASE_STACK_H_
#define V8_HEAP_BASE_STACK_H_
#include "src/base/macros.h"
namespace heap {
namespace base {
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 = nullptr);
// Sets the start of the stack.
void SetStackStart(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. Callee-saved registers are pushed to
// the stack before iterating pointers. Slot values are passed on to
// `visitor`.
void IteratePointers(StackVisitor* visitor) const;
// Word-aligned iteration of the stack, starting at `stack_end`. Slot values
// are passed on to `visitor`. This is intended to be used with verifiers that
// only visit a subset of the stack of IteratePointers().
//
// **Ignores:**
// - Callee-saved registers.
// - SafeStack.
void IteratePointersUnsafe(StackVisitor* visitor, uintptr_t stack_end) const;
// Returns the start of the stack.
const void* stack_start() const { return stack_start_; }
// Get the current stack pointer for the stack, on which local variables are
// stored. In case the safe-stack is enabled (-fsanitize=safe-stack), this
// will return the stack pointer for the unsafe-stack. Otherwise, the function
// returns the stack pointer for the native stack.
static const void* GetCurrentStackPointerForLocalVariables();
private:
const void* stack_start_;
};
} // namespace base
} // namespace heap
#endif // V8_HEAP_BASE_STACK_H_
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