Squashed 'third_party/ctemplate/' content from commit 6742f62
Change-Id: I828e4e4c906f13ba19944d78a8a78652b62949af
git-subtree-dir: third_party/ctemplate
git-subtree-split: 6742f6233db12f545e90baa8f34f5c29c4eb396a
diff --git a/src/base/macros.h b/src/base/macros.h
new file mode 100644
index 0000000..9d0327c
--- /dev/null
+++ b/src/base/macros.h
@@ -0,0 +1,114 @@
+// Copyright 2011 Google Inc. All Rights Reserved.
+// Author: csilvers@google.com (Craig Silverstein)
+//
+// Provides macros and typedefs based on config.h settings.
+// Provides the following macros:
+// UNALIGNED_LOAD32 (may be an inline function on some architectures)
+// and the following typedefs:
+// uint32
+// uint64
+
+#ifndef CTEMPLATE_MACROS_H_
+#define CTEMPLATE_MACROS_H_
+
+#include <config.h>
+#ifdef HAVE_STDINT_H
+#include <stdint.h> // the normal place uint32_t is defined
+#endif
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h> // the normal place u_int32_t is defined
+#endif
+#ifdef HAVE_INTTYPES_H
+#ifdef HAVE_INTTYPES_H
+# include <inttypes.h>
+#endif // a third place for uint32_t or u_int32_t
+#endif
+
+#if defined(HAVE_U_INT32_T)
+typedef u_int32_t uint32;
+#elif defined(HAVE_UINT32_T)
+typedef uint32_t uint32;
+#elif defined(HAVE___INT32)
+typedef unsigned __int32 uint32;
+#endif
+
+#if defined(HAVE_U_INT64_T)
+typedef u_int64_t uint64;
+#elif defined(HAVE_UINT64_T)
+typedef uint64_t uint64;
+#elif defined(HAVE___INT64)
+typedef unsigned __int64 uint64;
+#endif
+
+
+// This is all to figure out endian-ness and byte-swapping on various systems
+#if defined(HAVE_ENDIAN_H)
+#include <endian.h> // for the __BYTE_ORDER use below
+#elif defined(HAVE_SYS_ENDIAN_H)
+#include <sys/endian.h> // location on FreeBSD
+#elif defined(HAVE_MACHINE_ENDIAN_H)
+#include <machine/endian.h> // location on OS X
+#endif
+#if defined(HAVE_SYS_BYTEORDER_H)
+#include <sys/byteorder.h> // BSWAP_32 on Solaris 10
+#endif
+#ifdef HAVE_SYS_ISA_DEFS_H
+#include <sys/isa_defs.h> // _BIG_ENDIAN/_LITTLE_ENDIAN on Solaris 10
+#endif
+
+// MurmurHash does a lot of 4-byte unaligned integer access. It
+// interprets these integers in little-endian order. This is perfect
+// on x86, for which this is a natural memory access; for other systems
+// we do what we can to make this as efficient as possible.
+#if defined(HAVE_BYTESWAP_H)
+# include <byteswap.h> // GNU (especially linux)
+# define BSWAP32(x) bswap_32(x)
+#elif defined(HAVE_LIBKERN_OSBYTEORDER_H)
+# include <libkern/OSByteOrder.h> // OS X
+# define BSWAP32(x) OSSwapInt32(x)
+#elif defined(bswap32) // FreeBSD
+ // FreeBSD defines bswap32 as a macro in sys/endian.h (already #included)
+# define BSWAP32(x) bswap32(x)
+#elif defined(BSWAP_32) // Solaris 10
+ // Solaris defines BSWSAP_32 as a macro in sys/byteorder.h (already #included)
+# define BSWAP32(x) BSWAP_32(x)
+#elif !defined(BSWAP32)
+# define BSWAP32(x) ((((x) & 0x000000ff) << 24) | \
+ (((x) & 0x0000ff00) << 8) | \
+ (((x) & 0x00ff0000) >> 8) | \
+ (((x) & 0xff000000) >> 24));
+#else
+# define CTEMPLATE_BSWAP32_ALREADY_DEFINED
+#endif
+
+#if defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64)
+ // We know they allow unaligned memory access and are little-endian
+# define UNALIGNED_LOAD32(_p) (*reinterpret_cast<const uint32 *>(_p))
+#elif defined(__ppc__) || defined(__ppc64__)
+ // We know they allow unaligned memory access and are big-endian
+# define UNALIGNED_LOAD32(_p) BSWAP32(*reinterpret_cast<const uint32 *>(_p))
+#elif (BYTE_ORDER == 1234) || (_BYTE_ORDER == 1234) || defined(_LITTLE_ENDIAN)
+ // Use memcpy to align the memory properly
+ inline uint32 UNALIGNED_LOAD32(const void *p) {
+ uint32 t;
+ memcpy(&t, p, sizeof(t));
+ return t;
+ }
+#elif (BYTE_ORDER == 4321) || (_BYTE_ORDER == 4321) || defined(_BIG_ENDIAN)
+ inline uint32 UNALIGNED_LOAD32(const void *p) {
+ uint32 t;
+ memcpy(&t, p, sizeof(t));
+ return BSWAP32(t);
+ }
+#else
+ // Means we can't find find endian.h on this machine:
+# error Need to define UNALIGNED_LOAD32 for this architecture
+#endif
+
+#ifndef CTEMPLATE_BSWAP32_ALREADY_DEFINED
+# undef BSWAP32 // don't leak outside this file
+#else
+# undef CTEMPLATE_BSWAP32_ALREADY_DEFINED // just cleaning up
+#endif
+
+#endif // CTEMPLATE_MACROS_H_