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https://github.com/RetroDECK/Duckstation.git
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275 lines
7 KiB
C++
275 lines
7 KiB
C++
#ifndef _C4_YML_DETAIL_STACK_HPP_
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#define _C4_YML_DETAIL_STACK_HPP_
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#ifndef _C4_YML_COMMON_HPP_
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#include "../common.hpp"
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#endif
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#ifdef RYML_DBG
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# include <type_traits>
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#endif
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#include <string.h>
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namespace c4 {
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namespace yml {
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namespace detail {
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/** A lightweight contiguous stack with SSO. This avoids a dependency on std. */
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template<class T, size_t N=16>
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class stack
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{
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static_assert(std::is_trivially_copyable<T>::value, "T must be trivially copyable");
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static_assert(std::is_trivially_destructible<T>::value, "T must be trivially destructible");
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enum : size_t { sso_size = N };
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public:
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T m_buf[N];
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T * m_stack;
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size_t m_size;
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size_t m_capacity;
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Callbacks m_callbacks;
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public:
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constexpr static bool is_contiguous() { return true; }
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stack(Callbacks const& cb)
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: m_buf()
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, m_stack(m_buf)
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, m_size(0)
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, m_capacity(N)
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, m_callbacks(cb) {}
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stack() : stack(get_callbacks()) {}
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~stack()
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{
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_free();
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}
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stack(stack const& that) noexcept : stack(that.m_callbacks)
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{
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resize(that.m_size);
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_cp(&that);
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}
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stack(stack &&that) noexcept : stack(that.m_callbacks)
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{
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_mv(&that);
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}
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stack& operator= (stack const& that) noexcept
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{
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_cb(that.m_callbacks);
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resize(that.m_size);
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_cp(&that);
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return *this;
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}
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stack& operator= (stack &&that) noexcept
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{
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_cb(that.m_callbacks);
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_mv(&that);
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return *this;
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}
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public:
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size_t size() const { return m_size; }
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size_t empty() const { return m_size == 0; }
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size_t capacity() const { return m_capacity; }
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void clear()
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{
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m_size = 0;
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}
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void resize(size_t sz)
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{
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reserve(sz);
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m_size = sz;
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}
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void reserve(size_t sz);
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void push(T const& C4_RESTRICT n)
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{
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RYML_ASSERT((const char*)&n + sizeof(T) < (const char*)m_stack || &n > m_stack + m_capacity);
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if(m_size == m_capacity)
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{
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size_t cap = m_capacity == 0 ? N : 2 * m_capacity;
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reserve(cap);
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}
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m_stack[m_size] = n;
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++m_size;
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}
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void push_top()
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{
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RYML_ASSERT(m_size > 0);
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if(m_size == m_capacity)
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{
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size_t cap = m_capacity == 0 ? N : 2 * m_capacity;
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reserve(cap);
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}
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m_stack[m_size] = m_stack[m_size - 1];
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++m_size;
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}
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T const& C4_RESTRICT pop()
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{
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RYML_ASSERT(m_size > 0);
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--m_size;
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return m_stack[m_size];
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}
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C4_ALWAYS_INLINE T const& C4_RESTRICT top() const { RYML_ASSERT(m_size > 0); return m_stack[m_size - 1]; }
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C4_ALWAYS_INLINE T & C4_RESTRICT top() { RYML_ASSERT(m_size > 0); return m_stack[m_size - 1]; }
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C4_ALWAYS_INLINE T const& C4_RESTRICT bottom() const { RYML_ASSERT(m_size > 0); return m_stack[0]; }
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C4_ALWAYS_INLINE T & C4_RESTRICT bottom() { RYML_ASSERT(m_size > 0); return m_stack[0]; }
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C4_ALWAYS_INLINE T const& C4_RESTRICT top(size_t i) const { RYML_ASSERT(i < m_size); return m_stack[m_size - 1 - i]; }
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C4_ALWAYS_INLINE T & C4_RESTRICT top(size_t i) { RYML_ASSERT(i < m_size); return m_stack[m_size - 1 - i]; }
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C4_ALWAYS_INLINE T const& C4_RESTRICT bottom(size_t i) const { RYML_ASSERT(i < m_size); return m_stack[i]; }
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C4_ALWAYS_INLINE T & C4_RESTRICT bottom(size_t i) { RYML_ASSERT(i < m_size); return m_stack[i]; }
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C4_ALWAYS_INLINE T const& C4_RESTRICT operator[](size_t i) const { RYML_ASSERT(i < m_size); return m_stack[i]; }
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C4_ALWAYS_INLINE T & C4_RESTRICT operator[](size_t i) { RYML_ASSERT(i < m_size); return m_stack[i]; }
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public:
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using iterator = T *;
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using const_iterator = T const *;
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iterator begin() { return m_stack; }
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iterator end () { return m_stack + m_size; }
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const_iterator begin() const { return (const_iterator)m_stack; }
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const_iterator end () const { return (const_iterator)m_stack + m_size; }
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public:
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void _free();
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void _cp(stack const* C4_RESTRICT that);
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void _mv(stack * that);
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void _cb(Callbacks const& cb);
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};
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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template<class T, size_t N>
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void stack<T, N>::reserve(size_t sz)
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{
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if(sz <= m_size)
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return;
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if(sz <= N)
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{
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m_stack = m_buf;
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m_capacity = N;
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return;
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}
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T *buf = (T*) m_callbacks.m_allocate(sz * sizeof(T), m_stack, m_callbacks.m_user_data);
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memcpy(buf, m_stack, m_size * sizeof(T));
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if(m_stack != m_buf)
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{
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m_callbacks.m_free(m_stack, m_capacity * sizeof(T), m_callbacks.m_user_data);
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}
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m_stack = buf;
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m_capacity = sz;
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}
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//-----------------------------------------------------------------------------
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template<class T, size_t N>
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void stack<T, N>::_free()
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{
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RYML_ASSERT(m_stack != nullptr); // this structure cannot be memset() to zero
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if(m_stack != m_buf)
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{
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m_callbacks.m_free(m_stack, m_capacity * sizeof(T), m_callbacks.m_user_data);
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m_stack = m_buf;
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m_size = N;
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m_capacity = N;
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}
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else
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{
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RYML_ASSERT(m_capacity == N);
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}
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}
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//-----------------------------------------------------------------------------
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template<class T, size_t N>
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void stack<T, N>::_cp(stack const* C4_RESTRICT that)
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{
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if(that->m_stack != that->m_buf)
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{
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RYML_ASSERT(that->m_capacity > N);
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RYML_ASSERT(that->m_size <= that->m_capacity);
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}
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else
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{
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RYML_ASSERT(that->m_capacity <= N);
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RYML_ASSERT(that->m_size <= that->m_capacity);
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}
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memcpy(m_stack, that->m_stack, that->m_size * sizeof(T));
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m_size = that->m_size;
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m_capacity = that->m_size < N ? N : that->m_size;
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m_callbacks = that->m_callbacks;
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}
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//-----------------------------------------------------------------------------
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template<class T, size_t N>
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void stack<T, N>::_mv(stack * that)
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{
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if(that->m_stack != that->m_buf)
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{
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RYML_ASSERT(that->m_capacity > N);
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RYML_ASSERT(that->m_size <= that->m_capacity);
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m_stack = that->m_stack;
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}
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else
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{
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RYML_ASSERT(that->m_capacity <= N);
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RYML_ASSERT(that->m_size <= that->m_capacity);
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memcpy(m_buf, that->m_buf, that->m_size * sizeof(T));
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m_stack = m_buf;
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}
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m_size = that->m_size;
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m_capacity = that->m_capacity;
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m_callbacks = that->m_callbacks;
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// make sure no deallocation happens on destruction
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RYML_ASSERT(that->m_stack != m_buf);
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that->m_stack = that->m_buf;
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that->m_capacity = N;
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that->m_size = 0;
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}
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//-----------------------------------------------------------------------------
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template<class T, size_t N>
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void stack<T, N>::_cb(Callbacks const& cb)
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{
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if(cb != m_callbacks)
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{
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_free();
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m_callbacks = cb;
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}
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}
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} // namespace detail
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} // namespace yml
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} // namespace c4
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#endif /* _C4_YML_DETAIL_STACK_HPP_ */
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