Refactor the JIT to be object-oriented (#1879)

* Move TinyVector to a new file

- So it's less sensitive to #include ordering

* Forgot to include assert.h

* Refactor ARMJIT_Memory into an object

* Oops, forgot a declaration

* Refactor ARMJIT to be contained in an object

* Remove an unused function declaration

* Add a missing #include

* Remove a now-unused global

* Use ARMJIT_Memory's own memory access functions

* Fix some omissions in the ARM JIT

* Move libandroid to be a member of ARMJIT_Memory instead of a global

* Default-initialize most fields in ARMJIT_Compiler.h

* Define NOOP_IF_NO_JIT

* Finish refactoring the JIT to be object-oriented

src/TinyVector.h

@@ -0,0 +1,131 @@
+/*
+    Copyright 2016-2023 melonDS team, RSDuck
+
+    This file is part of melonDS.
+
+    melonDS is free software: you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation, either version 3 of the License, or (at your option)
+    any later version.
+
+    melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with melonDS. If not, see http://www.gnu.org/licenses/.
+*/
+
+#ifndef MELONDS_TINYVECTOR_H
+#define MELONDS_TINYVECTOR_H
+
+#include <assert.h>
+#include <string.h>
+#include "types.h"
+
+namespace ARMJIT
+{
+/*
+    TinyVector
+        - because reinventing the wheel is the best!
+
+    - meant to be used very often, with not so many elements
+    max 1 << 16 elements
+    - doesn't allocate while no elements are inserted
+    - not stl confirmant of course
+    - probably only works with POD types
+    - remove operations don't preserve order, but O(1)!
+*/
+template<typename T>
+struct __attribute__((packed)) TinyVector
+{
+    T* Data = NULL;
+    u16 Capacity = 0;
+    u16 Length = 0;
+
+    ~TinyVector()
+    {
+        delete[] Data;
+    }
+
+    void MakeCapacity(u32 capacity)
+    {
+        assert(capacity <= UINT16_MAX);
+        assert(capacity > Capacity);
+        T* newMem = new T[capacity];
+        if (Data != NULL)
+            memcpy(newMem, Data, sizeof(T) * Length);
+
+        T* oldData = Data;
+        Data = newMem;
+        if (oldData != NULL)
+            delete[] oldData;
+
+        Capacity = capacity;
+    }
+
+    void SetLength(u16 length)
+    {
+        if (Capacity < length)
+            MakeCapacity(length);
+
+        Length = length;
+    }
+
+    void Clear()
+    {
+        Length = 0;
+    }
+
+    void Add(T element)
+    {
+        assert(Length + 1 <= UINT16_MAX);
+        if (Length + 1 > Capacity)
+            MakeCapacity(((Capacity + 4) * 3) / 2);
+
+        Data[Length++] = element;
+    }
+
+    void Remove(int index)
+    {
+        assert(Length > 0);
+        assert(index >= 0 && index < Length);
+
+        Length--;
+        Data[index] = Data[Length];
+        /*for (int i = index; i < Length; i++)
+            Data[i] = Data[i + 1];*/
+    }
+
+    int Find(T needle)
+    {
+        for (int i = 0; i < Length; i++)
+        {
+            if (Data[i] == needle)
+                return i;
+        }
+        return -1;
+    }
+
+    bool RemoveByValue(T needle)
+    {
+        for (int i = 0; i < Length; i++)
+        {
+            if (Data[i] == needle)
+            {
+                Remove(i);
+                return true;
+            }
+        }
+        return false;
+    }
+
+    T& operator[](int index)
+    {
+        assert(index >= 0 && index < Length);
+        return Data[index];
+    }
+};
+}
+
+#endif //MELONDS_TINYVECTOR_H