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/* SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once
/** \file
* \ingroup bli
*/
#include "BLI_array.hh"
#include "BLI_linear_allocator.hh"
#include "BLI_stack.hh"
#include "BLI_string_ref.hh"
namespace blender {
/**
* A hash that unique identifies a specific context stack. The hash has to have enough bits to make
* collisions practically impossible.
*/
struct ContextStackHash {
static constexpr int64_t HashSizeInBytes = 16;
uint64_t v1 = 0;
uint64_t v2 = 0;
uint64_t hash() const
{
return v1;
}
friend bool operator==(const ContextStackHash &a, const ContextStackHash &b)
{
return a.v1 == b.v1 && a.v2 == b.v2;
}
void mix_in(const void *data, int64_t len);
friend std::ostream &operator<<(std::ostream &stream, const ContextStackHash &hash);
};
static_assert(sizeof(ContextStackHash) == ContextStackHash::HashSizeInBytes);
class ContextStack {
private:
const char *static_type_;
const ContextStack *parent_ = nullptr;
protected:
ContextStackHash hash_;
public:
ContextStack(const char *static_type, const ContextStack *parent)
: static_type_(static_type), parent_(parent)
{
if (parent != nullptr) {
hash_ = parent_->hash_;
}
}
virtual ~ContextStack() = default;
const ContextStackHash &hash() const
{
return hash_;
}
const char *static_type() const
{
return static_type_;
}
const ContextStack *parent() const
{
return parent_;
}
void print_stack(std::ostream &stream, StringRef name) const;
virtual void print_current_in_line(std::ostream &stream) const = 0;
friend std::ostream &operator<<(std::ostream &stream, const ContextStack &context_stack);
};
class ContextStackBuilder {
private:
LinearAllocator<> allocator_;
Stack<destruct_ptr<ContextStack>> contexts_;
public:
bool is_empty() const
{
return contexts_.is_empty();
}
const ContextStack *current() const
{
if (contexts_.is_empty()) {
return nullptr;
}
return contexts_.peek().get();
}
const ContextStackHash hash() const
{
BLI_assert(!contexts_.is_empty());
return this->current()->hash();
}
template<typename T, typename... Args> void push(Args &&...args)
{
const ContextStack *current = this->current();
destruct_ptr<T> context = allocator_.construct<T>(current, std::forward<Args>(args)...);
contexts_.push(std::move(context));
}
void pop()
{
contexts_.pop();
}
};
} // namespace blender
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