feat: first prototype of optimizers + alloca optimizer

include/prelude/file.hpp

@@ -0,0 +1,79 @@
+#pragma once
+#include "prelude/string.hpp"
+#include <cstdio>
+
+class File
+{
+public:
+    enum class Mode
+    {
+        WRITE,
+        READ,
+    };
+
+private:
+    File(FILE* handle, Mode mode)
+        : m_handle(handle), m_mode(mode) {}
+
+public:
+    static File Open(const StringView& filename, Mode mode)
+    {
+        StringBuilder sb;
+        switch(mode)
+        {
+        case Mode::WRITE:
+            sb.Append('w');
+            break;
+        case Mode::READ:
+            sb.Append('r');
+            break;
+        }
+        FILE* handle = fopen(filename.c_str(), sb.c_str());
+        return File(handle, mode);
+    }
+
+private:
+    inline bool Writable() const { return m_mode == File::Mode::WRITE; }
+    inline bool Readable() const { return m_mode == File::Mode::READ; }
+
+public:
+    bool Write(const StringView& content)
+    {
+        assert(Writable() && "attempt to write to a file in read only mode");
+        if (fwrite(content.c_str(), sizeof(char), content.size - 1, m_handle) == 0)
+        {
+            return false;
+        }
+        return true;
+    }
+
+public:
+    StringView ReadAll(bool* status = nullptr)
+    {
+        auto fail = [&]() -> StringView {
+            if (status) *status = false;
+            return {};
+        };
+
+        if (status) *status = true;
+
+        assert(Readable() && "attempt to read from a file in write only mode");
+        if (fseek(m_handle, 0, SEEK_END) != 0) return fail();
+
+        auto size = ftell(m_handle);
+        if (size == -1 && status) return fail();
+
+        StringBuilder sb;
+        sb.ensure_extra(size);
+
+        size_t wrote = fread(sb.data, sizeof(char), size, m_handle);
+        if (wrote == 0) return fail();
+
+        sb.size = wrote;
+        return sb.view();
+    }
+
+private:
+    FILE* m_handle;
+    Mode m_mode;
+};

include/prelude/linkedlist.hpp

@@ -0,0 +1,85 @@
+#pragma once
+#include <cstddef>
+#include "prelude/string.hpp"
+
+template<typename T>
+struct ListNode
+{
+    T value;
+    ListNode* prev = nullptr;
+    ListNode* next = nullptr;
+};
+
+template<typename T>
+class DoubleLinkedList {
+public:
+    DoubleLinkedList() = default;
+
+public:
+    static DoubleLinkedList<T> FromView(const View<T> &view)
+    {
+        auto list = DoubleLinkedList<T>();
+        for (size_t i = 0; i < view.size; ++i)
+        {
+            list.Append(new ListNode<T>(view.data[i]));
+        }
+        return list;
+    }
+
+public:
+    void Append(ListNode<T>* node)
+    {
+        if (IsEmpty())
+        {
+            node->next = nullptr;
+            node->prev = nullptr;
+            tail = node;
+            head = node;
+        } else {
+            head->next = node;
+            node->prev = head;
+            node->next = nullptr;
+            head = node;
+        }
+        m_size++;
+    }
+
+    void Prepend(ListNode<T>* node)
+    {
+        if (IsEmpty())
+        {
+            Append(node);
+        } else {
+            tail->prev = node;
+            node->next = tail;
+            node->prev = nullptr;
+            tail = node;
+            m_size++;
+        }
+    }
+
+    void SpliceFront(ListNode<T>* node)
+    {
+        if (m_size == 1 && tail == node && head == node) return;
+        assert((node->next || node->prev) && "node should be inside of the linked list");
+        if (node == tail) return;
+        if (node == head) {
+            node->prev->next = nullptr;
+            head = node->prev;
+        } else {
+            node->prev->next = node->next;
+            node->next->prev = node->prev;
+        }
+        m_size--;
+        Prepend(node);
+    }
+
+    bool IsEmpty() const { return m_size == 0; }
+
+    ListNode<T>* Begin() const { return tail; }
+    ListNode<T>* End() const { return head; }
+private:
+    ListNode<T>* head = nullptr;
+    ListNode<T>* tail = nullptr;
+    size_t m_size = 0;
+};

include/prelude/string.hpp

@@ -68,8 +68,6 @@ public:
 };
 
 
-// using StringView = View<char>;
-
 class StringView final : public View<char>
 {
 public: