Bug 730805 - Provide mozilla/IntegerPrintfMacros.h to implement the PRI* macros portion of the <inttypes.h> interface. r=espindola

--HG--
extra : rebase_source : be80333003c6fec659e736a77463568c836d8348

Author: jswalden

configure.in

@@ -1733,6 +1733,16 @@ case "$host" in
     ;;
 esac
 
+dnl Check for using a custom <inttypes.h> implementation
+dnl ========================================================
+AC_MSG_CHECKING(for custom <inttypes.h> implementation)
+if test "$MOZ_CUSTOM_INTTYPES_H"; then
+  AC_DEFINE_UNQUOTED(MOZ_CUSTOM_INTTYPES_H, "$MOZ_CUSTOM_INTTYPES_H")
+  AC_MSG_RESULT(using $MOZ_CUSTOM_INTTYPES_H)
+else
+  AC_MSG_RESULT(none specified)
+fi
+
 dnl Get mozilla version from central milestone file
 MOZILLA_VERSION=`$PERL $srcdir/config/milestone.pl -topsrcdir $srcdir`
 MOZILLA_UAVERSION=`$PERL $srcdir/config/milestone.pl -topsrcdir $srcdir -uaversion`

ipc/chromium/src/base/basictypes.h

@@ -12,7 +12,7 @@
 #include "base/port.h"    // Types that only need exist on certain systems
 
 #include "mozilla/Assertions.h"
-#include <stdint.h>
+#include "mozilla/IntegerPrintfMacros.h"
 
 // A type to represent a Unicode code-point value. As of Unicode 4.0,
 // such values require up to 21 bits.
@@ -35,15 +35,10 @@ const  int64_t kint64max  = (( int64_t) GG_LONGLONG(0x7FFFFFFFFFFFFFFF));
 
 // Platform- and hardware-dependent printf specifiers
 #  if defined(OS_POSIX)
-#    define __STDC_FORMAT_MACROS 1
-#    include <inttypes.h>           // for 64-bit integer format macros
 #    define PRId64L "I64d"
 #    define PRIu64L "I64u"
 #    define PRIx64L "I64x"
 #  elif defined(OS_WIN)
-#    define PRId64 "I64d"
-#    define PRIu64 "I64u"
-#    define PRIx64 "I64x"
 #    define PRId64L L"I64d"
 #    define PRIu64L L"I64u"
 #    define PRIx64L L"I64x"

js/public/RequiredDefines.h

@@ -15,9 +15,17 @@
 
 /*
  * The c99 defining the limit macros (UINT32_MAX for example), says:
- * C++ implementations should define these macros only when __STDC_LIMIT_MACROS
- * is defined before <stdint.h> is included.
+ *
+ *   C++ implementations should define these macros only when
+ *   __STDC_LIMIT_MACROS is defined before <stdint.h> is included.
+ *
+ * The same also occurs with __STDC_CONSTANT_MACROS for the constant macros
+ * (INT8_C for example) used to specify a literal constant of the proper type,
+ * and with __STDC_FORMAT_MACROS for the format macros (PRId32 for example) used
+ * with the fprintf function family.
  */
 #define __STDC_LIMIT_MACROS
+#define __STDC_CONSTANT_MACROS
+#define __STDC_FORMAT_MACROS
 
 #endif /* js_RequiredDefines_h */

js/src/configure.in

@@ -1359,6 +1359,16 @@ case "$host" in
     ;;
 esac
 
+dnl Check for using a custom <inttypes.h> implementation
+dnl ========================================================
+AC_MSG_CHECKING(for custom <inttypes.h> implementation)
+if test "$MOZ_CUSTOM_INTTYPES_H"; then
+  AC_DEFINE_UNQUOTED(MOZ_CUSTOM_INTTYPES_H, "$MOZ_CUSTOM_INTTYPES_H")
+  AC_MSG_RESULT(using $MOZ_CUSTOM_INTTYPES_H)
+else
+  AC_MSG_RESULT(none specified)
+fi
+
 MOZ_DOING_LTO(lto_is_enabled)
 
 dnl ========================================================

mfbt/IntegerPrintfMacros.h

@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Implements the C99 <inttypes.h> interface, minus the SCN* format macros. */
+
+#ifndef mozilla_IntegerPrintfMacros_h_
+#define mozilla_IntegerPrintfMacros_h_
+
+/*
+ * MSVC++ doesn't include <inttypes.h>, even in versions shipping <stdint.h>, so
+ * we have to reimplement it there.  Note: <inttypes.h> #includes <stdint.h>.
+ *
+ * Note that this header DOES NOT implement <inttypes.h>'s scanf macros.  MSVC's
+ * scanf doesn't have sufficient format specifier support to implement them
+ * (specifically, to implement scanning into an 8-bit location).
+ *
+ * http://stackoverflow.com/questions/3036396/scanfd-char-char-as-int-format-string
+ *
+ * Moreover, scanf is a footgun: if the input number exceeds the bounds of the
+ * target type, behavior is undefined (in the compiler sense: that is, this code
+ * could overwrite your hard drive with zeroes):
+ *
+ *   uint8_t u;
+ *   sscanf("256", "%" SCNu8, &u); // BAD
+ *
+ * This header will sometimes provide SCN* macros, by dint of being implemented
+ * using <inttypes.h>.  But for these reasons, *never* use them!
+ */
+
+#if defined(MOZ_CUSTOM_INTTYPES_H)
+#  include MOZ_CUSTOM_INTTYPES_H
+#elif defined(_MSC_VER)
+#  include "mozilla/MSIntTypes.h"
+#else
+#  include <inttypes.h>
+#endif
+
+#endif  /* mozilla_IntegerPrintfMacros_h_ */

mfbt/MSIntTypes.h

@@ -40,7 +40,7 @@
 #pragma once
 #endif
 
-#include "stdint.h"
+#include <stdint.h>
 
 // 7.8 Format conversion of integer types
 
@@ -151,115 +151,8 @@ typedef struct {
 #define PRIxPTR     "Ix"
 #define PRIXPTR     "IX"
 
-// The fscanf macros for signed integers are:
-#define SCNd8       "d"
-#define SCNi8       "i"
-#define SCNdLEAST8  "d"
-#define SCNiLEAST8  "i"
-#define SCNdFAST8   "d"
-#define SCNiFAST8   "i"
-
-#define SCNd16       "hd"
-#define SCNi16       "hi"
-#define SCNdLEAST16  "hd"
-#define SCNiLEAST16  "hi"
-#define SCNdFAST16   "hd"
-#define SCNiFAST16   "hi"
-
-#define SCNd32       "ld"
-#define SCNi32       "li"
-#define SCNdLEAST32  "ld"
-#define SCNiLEAST32  "li"
-#define SCNdFAST32   "ld"
-#define SCNiFAST32   "li"
-
-#define SCNd64       "I64d"
-#define SCNi64       "I64i"
-#define SCNdLEAST64  "I64d"
-#define SCNiLEAST64  "I64i"
-#define SCNdFAST64   "I64d"
-#define SCNiFAST64   "I64i"
-
-#define SCNdMAX     "I64d"
-#define SCNiMAX     "I64i"
-
-#ifdef _WIN64 // [
-#  define SCNdPTR     "I64d"
-#  define SCNiPTR     "I64i"
-#else  // _WIN64 ][
-#  define SCNdPTR     "ld"
-#  define SCNiPTR     "li"
-#endif  // _WIN64 ]
-
-// The fscanf macros for unsigned integers are:
-#define SCNo8       "o"
-#define SCNu8       "u"
-#define SCNx8       "x"
-#define SCNX8       "X"
-#define SCNoLEAST8  "o"
-#define SCNuLEAST8  "u"
-#define SCNxLEAST8  "x"
-#define SCNXLEAST8  "X"
-#define SCNoFAST8   "o"
-#define SCNuFAST8   "u"
-#define SCNxFAST8   "x"
-#define SCNXFAST8   "X"
-
-#define SCNo16       "ho"
-#define SCNu16       "hu"
-#define SCNx16       "hx"
-#define SCNX16       "hX"
-#define SCNoLEAST16  "ho"
-#define SCNuLEAST16  "hu"
-#define SCNxLEAST16  "hx"
-#define SCNXLEAST16  "hX"
-#define SCNoFAST16   "ho"
-#define SCNuFAST16   "hu"
-#define SCNxFAST16   "hx"
-#define SCNXFAST16   "hX"
-
-#define SCNo32       "lo"
-#define SCNu32       "lu"
-#define SCNx32       "lx"
-#define SCNX32       "lX"
-#define SCNoLEAST32  "lo"
-#define SCNuLEAST32  "lu"
-#define SCNxLEAST32  "lx"
-#define SCNXLEAST32  "lX"
-#define SCNoFAST32   "lo"
-#define SCNuFAST32   "lu"
-#define SCNxFAST32   "lx"
-#define SCNXFAST32   "lX"
-
-#define SCNo64       "I64o"
-#define SCNu64       "I64u"
-#define SCNx64       "I64x"
-#define SCNX64       "I64X"
-#define SCNoLEAST64  "I64o"
-#define SCNuLEAST64  "I64u"
-#define SCNxLEAST64  "I64x"
-#define SCNXLEAST64  "I64X"
-#define SCNoFAST64   "I64o"
-#define SCNuFAST64   "I64u"
-#define SCNxFAST64   "I64x"
-#define SCNXFAST64   "I64X"
-
-#define SCNoMAX     "I64o"
-#define SCNuMAX     "I64u"
-#define SCNxMAX     "I64x"
-#define SCNXMAX     "I64X"
-
-#ifdef _WIN64 // [
-#  define SCNoPTR     "I64o"
-#  define SCNuPTR     "I64u"
-#  define SCNxPTR     "I64x"
-#  define SCNXPTR     "I64X"
-#else  // _WIN64 ][
-#  define SCNoPTR     "lo"
-#  define SCNuPTR     "lu"
-#  define SCNxPTR     "lx"
-#  define SCNXPTR     "lX"
-#endif  // _WIN64 ]
+// DO NOT SUPPORT THE scanf MACROS!  See the comment at the top of
+// IntegerPrintfMacros.h.
 
 #endif // __STDC_FORMAT_MACROS ]
 

mfbt/exported_headers.mk

@@ -28,6 +28,7 @@ EXPORTS_mozilla += \
   FloatingPoint.h \
   GuardObjects.h \
   HashFunctions.h \
+  IntegerPrintfMacros.h \
   Likely.h \
   LinkedList.h \
   MathAlgorithms.h \