Add clang-format file

Also run it across the whole tree to get everything using the One True Style.
We don't yet run this in an automated fashion as it's a little slow, but
there is a snippet to do so in makeall.sh.

Kernel/VM/MemoryManager.h

@@ -1,27 +1,28 @@
 #pragma once
 
-#include <AK/Types.h>
 #include "i386.h"
-#include <AK/Bitmap.h>
-#include <AK/ByteBuffer.h>
-#include <AK/Retainable.h>
-#include <AK/RetainPtr.h>
-#include <AK/Vector.h>
-#include <AK/HashTable.h>
 #include <AK/AKString.h>
 #include <AK/Badge.h>
+#include <AK/Bitmap.h>
+#include <AK/ByteBuffer.h>
+#include <AK/HashTable.h>
+#include <AK/RetainPtr.h>
+#include <AK/Retainable.h>
+#include <AK/Types.h>
+#include <AK/Vector.h>
 #include <AK/Weakable.h>
+#include <Kernel/FileSystem/InodeIdentifier.h>
 #include <Kernel/LinearAddress.h>
 #include <Kernel/VM/PhysicalPage.h>
 #include <Kernel/VM/Region.h>
 #include <Kernel/VM/VMObject.h>
-#include <Kernel/FileSystem/InodeIdentifier.h>
 
-#define PAGE_ROUND_UP(x) ((((dword)(x)) + PAGE_SIZE-1) & (~(PAGE_SIZE-1)))
+#define PAGE_ROUND_UP(x) ((((dword)(x)) + PAGE_SIZE - 1) & (~(PAGE_SIZE - 1)))
 
 class SynthFSInode;
 
-enum class PageFaultResponse {
+enum class PageFaultResponse
+{
     ShouldCrash,
     Continue,
 };
@@ -36,6 +37,7 @@ class MemoryManager {
     friend class VMObject;
     friend ByteBuffer procfs$mm(InodeIdentifier);
     friend ByteBuffer procfs$memstat(InodeIdentifier);
+
 public:
     [[gnu::pure]] static MemoryManager& the();
 
@@ -54,7 +56,11 @@ public:
     bool validate_user_read(const Process&, LinearAddress) const;
     bool validate_user_write(const Process&, LinearAddress) const;
 
-    enum class ShouldZeroFill { No, Yes };
+    enum class ShouldZeroFill
+    {
+        No,
+        Yes
+    };
 
     RetainPtr<PhysicalPage> allocate_physical_page(ShouldZeroFill);
     RetainPtr<PhysicalPage> allocate_supervisor_physical_page();
@@ -106,7 +112,10 @@ private:
     PageDirectory& kernel_page_directory() { return *m_kernel_page_directory; }
 
     struct PageDirectoryEntry {
-        explicit PageDirectoryEntry(dword* pde) : m_pde(pde) { }
+        explicit PageDirectoryEntry(dword* pde)
+            : m_pde(pde)
+        {
+        }
 
         dword* page_table_base() { return reinterpret_cast<dword*>(raw() & 0xfffff000u); }
         void set_page_table_base(dword value)
@@ -118,7 +127,8 @@ private:
         dword raw() const { return *m_pde; }
         dword* ptr() { return m_pde; }
 
-        enum Flags {
+        enum Flags
+        {
             Present = 1 << 0,
             ReadWrite = 1 << 1,
             UserSupervisor = 1 << 2,
@@ -153,7 +163,10 @@ private:
     };
 
     struct PageTableEntry {
-        explicit PageTableEntry(dword* pte) : m_pte(pte) { }
+        explicit PageTableEntry(dword* pte)
+            : m_pte(pte)
+        {
+        }
 
         dword* physical_page_base() { return reinterpret_cast<dword*>(raw() & 0xfffff000u); }
         void set_physical_page_base(dword value)
@@ -165,7 +178,8 @@ private:
         dword raw() const { return *m_pte; }
         dword* ptr() { return m_pte; }
 
-        enum Flags {
+        enum Flags
+        {
             Present = 1 << 0,
             ReadWrite = 1 << 1,
             UserSupervisor = 1 << 2,

Kernel/VM/PageDirectory.h

@@ -1,13 +1,14 @@
 #pragma once
 
+#include <AK/HashMap.h>
+#include <AK/RetainPtr.h>
+#include <AK/Retainable.h>
 #include <Kernel/VM/PhysicalPage.h>
 #include <Kernel/VM/RangeAllocator.h>
-#include <AK/HashMap.h>
-#include <AK/Retainable.h>
-#include <AK/RetainPtr.h>
 
 class PageDirectory : public Retainable<PageDirectory> {
     friend class MemoryManager;
+
 public:
     static Retained<PageDirectory> create_for_userspace(const RangeAllocator* parent_range_allocator = nullptr) { return adopt(*new PageDirectory(parent_range_allocator)); }
     static Retained<PageDirectory> create_at_fixed_address(PhysicalAddress paddr) { return adopt(*new PageDirectory(paddr)); }

Kernel/VM/PhysicalPage.h

@@ -1,13 +1,14 @@
 #pragma once
 
+#include <AK/Retained.h>
 #include <Kernel/Assertions.h>
 #include <Kernel/PhysicalAddress.h>
-#include <AK/Retained.h>
 
 class PhysicalPage {
     friend class MemoryManager;
     friend class PageDirectory;
     friend class VMObject;
+
 public:
     PhysicalAddress paddr() const { return m_paddr; }
 
@@ -35,7 +36,7 @@ public:
 
 private:
     PhysicalPage(PhysicalAddress paddr, bool supervisor, bool may_return_to_freelist = true);
-    ~PhysicalPage() { }
+    ~PhysicalPage() {}
 
     void return_to_freelist();
 

Kernel/VM/RangeAllocator.h

@@ -1,12 +1,13 @@
 #pragma once
 
-#include <Kernel/LinearAddress.h>
 #include <AK/Vector.h>
+#include <Kernel/LinearAddress.h>
 
 class Range {
     friend class RangeAllocator;
+
 public:
-    Range() { }
+    Range() {}
     Range(LinearAddress base, size_t size)
         : m_base(base)
         , m_size(size)

Kernel/VM/Region.h

@@ -10,6 +10,7 @@ class VMObject;
 
 class Region : public Retainable<Region> {
     friend class MemoryManager;
+
 public:
     Region(const Range&, String&&, bool r, bool w, bool cow = false);
     Region(const Range&, Retained<VMObject>&&, size_t offset_in_vmo, String&&, bool r, bool w, bool cow = false);

Kernel/VM/VMObject.h

@@ -1,11 +1,11 @@
 #pragma once
 
-#include <AK/Badge.h>
-#include <AK/Retainable.h>
-#include <AK/Weakable.h>
-#include <AK/RetainPtr.h>
-#include <AK/Vector.h>
 #include <AK/AKString.h>
+#include <AK/Badge.h>
+#include <AK/RetainPtr.h>
+#include <AK/Retainable.h>
+#include <AK/Vector.h>
+#include <AK/Weakable.h>
 #include <Kernel/Lock.h>
 #include <Kernel/PhysicalAddress.h>
 #include <Kernel/UnixTypes.h>
@@ -13,8 +13,10 @@
 class Inode;
 class PhysicalPage;
 
-class VMObject : public Retainable<VMObject>, public Weakable<VMObject> {
+class VMObject : public Retainable<VMObject>
+    , public Weakable<VMObject> {
     friend class MemoryManager;
+
 public:
     static Retained<VMObject> create_file_backed(RetainPtr<Inode>&&);
     static Retained<VMObject> create_anonymous(size_t);
@@ -46,7 +48,8 @@ private:
     explicit VMObject(size_t);
     VMObject(PhysicalAddress, size_t);
 
-    template<typename Callback> void for_each_region(Callback);
+    template<typename Callback>
+    void for_each_region(Callback);
 
     String m_name;
     bool m_allow_cpu_caching { true };