Updated the SDK with the latest code from the TF and HL2 branches.

1 files changed, 108 insertions, 111 deletions

diff --git a/mp/src/tier1/snappy-stubs-internal.h b/mp/src/tier1/snappy-stubs-internal.h
index ec5d1018..1413825a 100644
--- a/mp/src/tier1/snappy-stubs-internal.h
+++ b/mp/src/tier1/snappy-stubs-internal.h
@@ -37,18 +37,18 @@
 
 #include "tier0/platform.h"
 
-// don't use iostream, this make us fail to run under OS X 10.5
-//#include <iostream>
 #include <string>
 
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
 
-#ifdef HAVE_SYS_MMAN
+#ifdef HAVE_SYS_MMAN_H
 #include <sys/mman.h>
 #endif
 
+#include "snappy-stubs-public.h"
+
 #if defined(__x86_64__)
 
 // Enable 64-bit optimized versions of some routines.
@@ -65,13 +65,13 @@
 // header file is never used from any public header files.
 using namespace std;
 
-// We only define ARRAYSIZE if it isn't already defined, because this definition
-// is not very good.
-#ifndef ARRAYSIZE
 // The size of an array, if known at compile-time.
 // Will give unexpected results if used on a pointer.
-#define ARRAYSIZE(a) (sizeof(a) / sizeof(*(a)))
+// We undefine it first, since some compilers already have a definition.
+#ifdef ARRAYSIZE
+#undef ARRAYSIZE
 #endif
+#define ARRAYSIZE(a) (sizeof(a) / sizeof(*(a)))
 
 // Static prediction hints.
 #ifdef HAVE_BUILTIN_EXPECT
@@ -87,117 +87,19 @@ using namespace std;
 // version (anyone who wants to regenerate it can just do the call
 // themselves within main()).
 #define DEFINE_bool(flag_name, default_value, description) \
-  bool FLAGS_ ## flag_name = default_value;
+  bool FLAGS_ ## flag_name = default_value
 #define DECLARE_bool(flag_name) \
-  extern bool FLAGS_ ## flag_name;
-#define REGISTER_MODULE_INITIALIZER(name, code)
-
-#define SNAPPY_DISALLOW_COPY_AND_ASSIGN(TypeName) \
-  TypeName(const TypeName&);               \
-  void operator=(const TypeName&)
+  extern bool FLAGS_ ## flag_name
 
 namespace snappy {
 
 static const uint32 kuint32max = static_cast<uint32>(0xFFFFFFFF);
 static const int64 kint64max = static_cast<int64>(0x7FFFFFFFFFFFFFFFLL);
 
-// Logging.
-
-#define LOG(level) LogMessage()
-#define VLOG(level) true ? (void)0 : \
-    snappy::LogMessageVoidify() & snappy::LogMessage()
-
-class LogMessage {
- public:
-  LogMessage() { }
-  ~LogMessage() {
-	  fprintf( stderr, "\n" );
-    //cerr << endl;
-  }
-
-  LogMessage& operator<<(const std::string& msg) {
-    //cerr << msg;
-	  fprintf( stderr, "%s", msg.c_str() );
-
-	  return *this;
-  }
-  LogMessage& operator<<(int x) {
-	  fprintf( stderr, "%d", x );
-    //cerr << x;
-    return *this;
-  }
-};
-
-// Asserts, both versions activated in debug mode only,
-// and ones that are always active.
-
-#define CRASH_UNLESS(condition) \
-    PREDICT_TRUE(condition) ? (void)0 : \
-    snappy::LogMessageVoidify() & snappy::LogMessageCrash()
-
-class LogMessageCrash : public LogMessage {
- public:
-  LogMessageCrash() { }
-#if _MSC_VER == 1700 || _MSC_VER == 1800
-// Bogus warning from VS 2012 and VS 2013:
-// warning C4722: 'snappy::LogMessageCrash::~LogMessageCrash' : destructor never returns, potential memory leak
-#pragma warning(push)
-#pragma warning(disable : 4722)
-#endif
-  ~LogMessageCrash() {
-	  fprintf( stderr, "\n" );
-//    cerr << endl;
-    abort();
-  }
-};
-#if _MSC_VER == 1700 || _MSC_VER == 1800
-#pragma warning(pop)
-#endif
-
-// This class is used to explicitly ignore values in the conditional
-// logging macros.  This avoids compiler warnings like "value computed
-// is not used" and "statement has no effect".
-
-class LogMessageVoidify {
- public:
-  LogMessageVoidify() { }
-  // This has to be an operator with a precedence lower than << but
-  // higher than ?:
-  void operator&(const LogMessage&) { }
-};
-
-#define CHECK(cond) CRASH_UNLESS(cond)
-#define CHECK_LE(a, b) CRASH_UNLESS((a) <= (b))
-#define CHECK_GE(a, b) CRASH_UNLESS((a) >= (b))
-#define CHECK_EQ(a, b) CRASH_UNLESS((a) == (b))
-#define CHECK_NE(a, b) CRASH_UNLESS((a) != (b))
-#define CHECK_LT(a, b) CRASH_UNLESS((a) < (b))
-#define CHECK_GT(a, b) CRASH_UNLESS((a) > (b))
-
-#ifdef NDEBUG
-
-#define DCHECK(cond) CRASH_UNLESS(true)
-#define DCHECK_LE(a, b) CRASH_UNLESS(true)
-#define DCHECK_GE(a, b) CRASH_UNLESS(true)
-#define DCHECK_EQ(a, b) CRASH_UNLESS(true)
-#define DCHECK_NE(a, b) CRASH_UNLESS(true)
-#define DCHECK_LT(a, b) CRASH_UNLESS(true)
-#define DCHECK_GT(a, b) CRASH_UNLESS(true)
-
-#else
-
-#define DCHECK(cond) CHECK(cond)
-#define DCHECK_LE(a, b) CHECK_LE(a, b)
-#define DCHECK_GE(a, b) CHECK_GE(a, b)
-#define DCHECK_EQ(a, b) CHECK_EQ(a, b)
-#define DCHECK_NE(a, b) CHECK_NE(a, b)
-#define DCHECK_LT(a, b) CHECK_LT(a, b)
-#define DCHECK_GT(a, b) CHECK_GT(a, b)
-
-#endif
-
 // Potentially unaligned loads and stores.
 
+// x86 and PowerPC can simply do these loads and stores native.
+
 #if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__)
 
 #define UNALIGNED_LOAD16(_p) (*reinterpret_cast<const uint16 *>(_p))
@@ -208,6 +110,49 @@ class LogMessageVoidify {
 #define UNALIGNED_STORE32(_p, _val) (*reinterpret_cast<uint32 *>(_p) = (_val))
 #define UNALIGNED_STORE64(_p, _val) (*reinterpret_cast<uint64 *>(_p) = (_val))
 
+// ARMv7 and newer support native unaligned accesses, but only of 16-bit
+// and 32-bit values (not 64-bit); older versions either raise a fatal signal,
+// do an unaligned read and rotate the words around a bit, or do the reads very
+// slowly (trip through kernel mode). There's no simple #define that says just
+// “ARMv7 or higher”, so we have to filter away all ARMv5 and ARMv6
+// sub-architectures.
+//
+// This is a mess, but there's not much we can do about it.
+
+#elif defined(__arm__) && \
+      !defined(__ARM_ARCH_4__) && \
+      !defined(__ARM_ARCH_4T__) && \
+      !defined(__ARM_ARCH_5__) && \
+      !defined(__ARM_ARCH_5T__) && \
+      !defined(__ARM_ARCH_5TE__) && \
+      !defined(__ARM_ARCH_5TEJ__) && \
+      !defined(__ARM_ARCH_6__) && \
+      !defined(__ARM_ARCH_6J__) && \
+      !defined(__ARM_ARCH_6K__) && \
+      !defined(__ARM_ARCH_6Z__) && \
+      !defined(__ARM_ARCH_6ZK__) && \
+      !defined(__ARM_ARCH_6T2__)
+
+#define UNALIGNED_LOAD16(_p) (*reinterpret_cast<const uint16 *>(_p))
+#define UNALIGNED_LOAD32(_p) (*reinterpret_cast<const uint32 *>(_p))
+
+#define UNALIGNED_STORE16(_p, _val) (*reinterpret_cast<uint16 *>(_p) = (_val))
+#define UNALIGNED_STORE32(_p, _val) (*reinterpret_cast<uint32 *>(_p) = (_val))
+
+// TODO(user): NEON supports unaligned 64-bit loads and stores.
+// See if that would be more efficient on platforms supporting it,
+// at least for copies.
+
+inline uint64 UNALIGNED_LOAD64(const void *p) {
+  uint64 t;
+  memcpy(&t, p, sizeof t);
+  return t;
+}
+
+inline void UNALIGNED_STORE64(void *p, uint64 v) {
+  memcpy(p, &v, sizeof v);
+}
+
 #else
 
 // These functions are provided for architectures that don't support
@@ -245,9 +190,31 @@ inline void UNALIGNED_STORE64(void *p, uint64 v) {
 
 #endif
 
+// This can be more efficient than UNALIGNED_LOAD64 + UNALIGNED_STORE64
+// on some platforms, in particular ARM.
+inline void UnalignedCopy64(const void *src, void *dst) {
+  if (sizeof(void *) == 8) {
+    UNALIGNED_STORE64(dst, UNALIGNED_LOAD64(src));
+  } else {
+    const char *src_char = reinterpret_cast<const char *>(src);
+    char *dst_char = reinterpret_cast<char *>(dst);
+
+    UNALIGNED_STORE32(dst_char, UNALIGNED_LOAD32(src_char));
+    UNALIGNED_STORE32(dst_char + 4, UNALIGNED_LOAD32(src_char + 4));
+  }
+}
+
 // The following guarantees declaration of the byte swap functions.
 #ifdef WORDS_BIGENDIAN
 
+#ifdef HAVE_SYS_BYTEORDER_H
+#include <sys/byteorder.h>
+#endif
+
+#ifdef HAVE_SYS_ENDIAN_H
+#include <sys/endian.h>
+#endif
+
 #ifdef _MSC_VER
 #include <stdlib.h>
 #define bswap_16(x) _byteswap_ushort(x)
@@ -261,8 +228,38 @@ inline void UNALIGNED_STORE64(void *p, uint64 v) {
 #define bswap_32(x) OSSwapInt32(x)
 #define bswap_64(x) OSSwapInt64(x)
 
-#else
+#elif defined(HAVE_BYTESWAP_H)
 #include <byteswap.h>
+
+#elif defined(bswap32)
+// FreeBSD defines bswap{16,32,64} in <sys/endian.h> (already #included).
+#define bswap_16(x) bswap16(x)
+#define bswap_32(x) bswap32(x)
+#define bswap_64(x) bswap64(x)
+
+#elif defined(BSWAP_64)
+// Solaris 10 defines BSWAP_{16,32,64} in <sys/byteorder.h> (already #included).
+#define bswap_16(x) BSWAP_16(x)
+#define bswap_32(x) BSWAP_32(x)
+#define bswap_64(x) BSWAP_64(x)
+
+#else
+
+inline uint16 bswap_16(uint16 x) {
+  return (x << 8) | (x >> 8);
+}
+
+inline uint32 bswap_32(uint32 x) {
+  x = ((x & 0xff00ff00UL) >> 8) | ((x & 0x00ff00ffUL) << 8);
+  return (x >> 16) | (x << 16);
+}
+
+inline uint64 bswap_64(uint64 x) {
+  x = ((x & 0xff00ff00ff00ff00ULL) >> 8) | ((x & 0x00ff00ff00ff00ffULL) << 8);
+  x = ((x & 0xffff0000ffff0000ULL) >> 16) | ((x & 0x0000ffff0000ffffULL) << 16);
+  return (x >> 32) | (x << 32);
+}
+
 #endif
 
 #endif  // WORDS_BIGENDIAN
@@ -332,7 +329,7 @@ class Bits {
   static int FindLSBSetNonZero64(uint64 n);
 
  private:
-  SNAPPY_DISALLOW_COPY_AND_ASSIGN(Bits);
+  DISALLOW_COPY_AND_ASSIGN(Bits);
 };
 
 #ifdef HAVE_BUILTIN_CTZ