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Source/Engine/Platform/Unix/UnixPlatform.cpp

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+#if PLATFORM_UNIX
+
+#include "Engine/Platform/Platform.h"
+#include <sys/types.h>
+#include <unistd.h>
+#include <cstdint>
+#include <stdlib.h>
+
+typedef uint16_t offset_t;
+#define align_mem_up(num, align) (((num) + ((align) - 1)) & ~((align) - 1))
+
+void* UnixPlatform::Allocate(uint64 size, uint64 alignment)
+{
+    void* ptr = nullptr;
+
+    // Alignment always has to be power of two
+    ASSERT_LOW_LAYER((alignment & (alignment - 1)) == 0);
+
+    if (alignment && size)
+    {
+        uint32_t pad = sizeof(offset_t) + (alignment - 1);
+        void* p = malloc(size + pad);
+
+        if (p)
+        {
+            // Add the offset size to malloc's pointer
+            ptr = (void*)align_mem_up(((uintptr_t)p + sizeof(offset_t)), alignment);
+
+            // Calculate the offset and store it behind aligned pointer
+            *((offset_t*)ptr - 1) = (offset_t)((uintptr_t)ptr - (uintptr_t)p);
+        }
+    }
+
+    return ptr;
+}
+
+void UnixPlatform::Free(void* ptr)
+{
+    if (ptr)
+    {
+        // Walk backwards from the passed-in pointer to get the pointer offset
+        offset_t offset = *((offset_t*)ptr - 1);
+
+        // Get original pointer
+        void* p = (void *)((uint8_t *)ptr - offset);
+
+        // Free memory
+        free(p);
+    }
+}
+
+uint64 UnixPlatform::GetCurrentProcessId()
+{
+    return getpid();
+}
+
+#endif