InterpStack.h

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//===--- InterpStack.h - Stack implementation for the VM --------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Defines the upwards-growing stack used by the interpreter.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_CLANG_AST_INTERP_INTERPSTACK_H
#define LLVM_CLANG_AST_INTERP_INTERPSTACK_H
 
#include "FixedPoint.h"
#include "FunctionPointer.h"
#include "IntegralAP.h"
#include "MemberPointer.h"
#include "PrimType.h"
#include <memory>
#include <vector>
 
namespace clang {
namespace interp {
 
/// Stack frame storing temporaries and parameters.
class InterpStack final {
public:
  InterpStack() {}
 
  /// Destroys the stack, freeing up storage.
  ~InterpStack();
 
  /// Constructs a value in place on the top of the stack.
  template <typename T, typename... Tys> void push(Tys &&...Args) {
    new (grow(aligned_size<T>())) T(std::forward<Tys>(Args)...);
#ifndef NDEBUG
    ItemTypes.push_back(toPrimType<T>());
#endif
  }
 
  /// Returns the value from the top of the stack and removes it.
  template <typename T> T pop() {
#ifndef NDEBUG
    assert(!ItemTypes.empty());
    assert(ItemTypes.back() == toPrimType<T>());
    ItemTypes.pop_back();
#endif
    T *Ptr = &peekInternal<T>();