bmalloc bun extras

Author: dylan-conway

Source/bmalloc/bmalloc/BunExtras.h

@@ -0,0 +1,15 @@
+#include <bit>
+
+#if defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806L
+#define __bit_cast std::bit_cast
+#else
+template <
+    typename Dest, typename Source,
+    typename std::enable_if<sizeof(Dest) == sizeof(Source) &&
+                                std::is_trivially_copyable<Source>::value &&
+                                std::is_trivially_copyable<Dest>::value,
+                            int>::type = 0>
+inline constexpr Dest __bit_cast(const Source &source) {
+  return __builtin_bit_cast(Dest, source);
+}
+#endif

Source/bmalloc/bmalloc/GigacageConfig.h

@@ -27,6 +27,7 @@
 
 #include "Algorithm.h"
 #include "GigacageKind.h"
+#include "BunExtras.h"
 #include <bit>
 #include <inttypes.h>
 

Source/bmalloc/bmalloc/IsoHeapImplInlines.h

@@ -29,6 +29,7 @@
 #include "IsoTLSDeallocatorEntry.h"
 #include "IsoSharedHeapInlines.h"
 #include "IsoSharedPageInlines.h"
+#include "BunExtras.h"
 
 #if !BUSE(LIBPAS)
 

Source/bmalloc/bmalloc/IsoPageInlines.h

@@ -30,6 +30,7 @@
 #include "IsoHeapImpl.h"
 #include "IsoPage.h"
 #include "VMAllocate.h"
+#include "BunExtras.h"
 #include <bit>
 
 #if !BUSE(LIBPAS)

Source/bmalloc/bmalloc/Packed.h

@@ -26,6 +26,7 @@
 #pragma once
 
 #include "Algorithm.h"
+#include "BunExtras.h"
 #include <array>
 #include <bit>