Preprocessor: add __BYTE_ORDER__ predefined macro

The __BYTE_ORDER__ predefined macro was added in GCC 4.6:
http://gcc.gnu.org/onlinedocs/gcc-4.6.0/cpp/Common-Predefined-Macros.html

It's used like the following:

 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 ...
 #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 ...
 #else
 #error insane architecture like the pdp-11
 #endif

There's a similar macro, __FLOAT_WORD_ORDER__, but it looks like it
mainly exist to accommodate fairly obscure architectures and ARM's
old FPA instructions, so it doesn't seem nearly as useful.

The tests are updated to check for the correct(at least, based on
clang's current output) value of the macro on each target. So now the
suite will catch bugs like the one fixed in r157626.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160879 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Frontend/InitPreprocessor.cpp b/lib/Frontend/InitPreprocessor.cpp
index 3979731ff6f842baeb0ce7cc44ec0af5abc47729..e8ae8e3120cbd2443c2bc8c022b96fafdd84dc41 100644 (file)
--- a/lib/Frontend/InitPreprocessor.cpp
+++ b/lib/Frontend/InitPreprocessor.cpp
@@ -445,6 +445,17 @@ static void InitializePredefinedMacros(const TargetInfo &TI,
 
   // Initialize target-specific preprocessor defines.
 
+  // __BYTE_ORDER__ was added in GCC 4.6.
+  // We don't support the PDP-11 as a target, but include
+  // the define so it can still be compared against.
+  Builder.defineMacro("__ORDER_LITTLE_ENDIAN__", "1234");
+  Builder.defineMacro("__ORDER_BIG_ENDIAN__",    "4321");
+  Builder.defineMacro("__ORDER_PDP_ENDIAN__",    "3412");
+  if (TI.isBigEndian())
+    Builder.defineMacro("__BYTE_ORDER__", "__ORDER_BIG_ENDIAN__");
+  else
+    Builder.defineMacro("__BYTE_ORDER__", "__ORDER_LITTLE_ENDIAN__");
+
   // Define type sizing macros based on the target properties.
   assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far");
   Builder.defineMacro("__CHAR_BIT__", "8");

diff --git a/test/Preprocessor/init.c b/test/Preprocessor/init.c
index 82a8d0b810088c2ca29d5125bb5e2b04b262b6b5..c2f7dcfa823d002fa85989a26cba626345a760d7 100644 (file)
--- a/test/Preprocessor/init.c
+++ b/test/Preprocessor/init.c
@@ -48,6 +48,9 @@
 // COMMON:#define __GNUC_STDC_INLINE__ 1
 // COMMON:#define __GNUC__
 // COMMON:#define __GXX_ABI_VERSION
+// COMMON:#define __ORDER_BIG_ENDIAN__ 4321
+// COMMON:#define __ORDER_LITTLE_ENDIAN__ 1234
+// COMMON:#define __ORDER_PDP_ENDIAN__ 3412
 // COMMON:#define __STDC_HOSTED__ 1
 // COMMON:#define __STDC_VERSION__
 // COMMON:#define __STDC__ 1
@@ -137,6 +140,7 @@
 // ARM:#define __APCS_32__ 1
 // ARM:#define __ARMEL__ 1
 // ARM:#define __ARM_ARCH_6J__ 1
+// ARM:#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
 // ARM:#define __CHAR16_TYPE__ unsigned short
 // ARM:#define __CHAR32_TYPE__ unsigned int
 // ARM:#define __CHAR_BIT__ 8
@@ -231,6 +235,7 @@
 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=i386-none-none < /dev/null | FileCheck -check-prefix I386 %s
 //
+// I386:#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
 // I386:#define __CHAR16_TYPE__ unsigned short
 // I386:#define __CHAR32_TYPE__ unsigned int
 // I386:#define __CHAR_BIT__ 8
@@ -326,6 +331,7 @@
 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=i386-pc-linux-gnu -target-cpu pentium4 < /dev/null | FileCheck -check-prefix I386-LINUX %s
 //
+// I386-LINUX:#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
 // I386-LINUX:#define __CHAR16_TYPE__ unsigned short
 // I386-LINUX:#define __CHAR32_TYPE__ unsigned int
 // I386-LINUX:#define __CHAR_BIT__ 8
@@ -428,6 +434,7 @@
 // MIPS32BE:#define _MIPS_SZINT 32
 // MIPS32BE:#define _MIPS_SZLONG 32
 // MIPS32BE:#define _MIPS_SZPTR 32
+// MIPS32BE:#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
 // MIPS32BE:#define __CHAR16_TYPE__ unsigned short
 // MIPS32BE:#define __CHAR32_TYPE__ unsigned int
 // MIPS32BE:#define __CHAR_BIT__ 8
@@ -540,6 +547,7 @@
 // MIPS32EL:#define _MIPS_SZINT 32
 // MIPS32EL:#define _MIPS_SZLONG 32
 // MIPS32EL:#define _MIPS_SZPTR 32
+// MIPS32EL:#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
 // MIPS32EL:#define __CHAR16_TYPE__ unsigned short
 // MIPS32EL:#define __CHAR32_TYPE__ unsigned int
 // MIPS32EL:#define __CHAR_BIT__ 8
@@ -649,6 +657,7 @@
 // MIPS64BE:#define _MIPS_SZINT 32
 // MIPS64BE:#define _MIPS_SZLONG 64
 // MIPS64BE:#define _MIPS_SZPTR 64
+// MIPS64BE:#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
 // MIPS64BE:#define __CHAR16_TYPE__ unsigned short
 // MIPS64BE:#define __CHAR32_TYPE__ unsigned int
 // MIPS64BE:#define __CHAR_BIT__ 8
@@ -758,6 +767,7 @@
 // MIPS64EL:#define _MIPS_SZINT 32
 // MIPS64EL:#define _MIPS_SZLONG 64
 // MIPS64EL:#define _MIPS_SZPTR 64
+// MIPS64EL:#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
 // MIPS64EL:#define __CHAR16_TYPE__ unsigned short
 // MIPS64EL:#define __CHAR32_TYPE__ unsigned int
 // MIPS64EL:#define __CHAR_BIT__ 8
@@ -905,6 +915,7 @@
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=msp430-none-none < /dev/null | FileCheck -check-prefix MSP430 %s
 //
 // MSP430:#define MSP430 1
+// MSP430:#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
 // MSP430:#define __CHAR16_TYPE__ unsigned short
 // MSP430:#define __CHAR32_TYPE__ unsigned int
 // MSP430:#define __CHAR_BIT__ 8
@@ -995,6 +1006,7 @@
 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=nvptx-none-none < /dev/null | FileCheck -check-prefix NVPTX32 %s
 //
+// NVPTX32:#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
 // NVPTX32:#define __CHAR16_TYPE__ unsigned short
 // NVPTX32:#define __CHAR32_TYPE__ unsigned int
 // NVPTX32:#define __CHAR_BIT__ 8
@@ -1088,6 +1100,7 @@
 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=nvptx64-none-none < /dev/null | FileCheck -check-prefix NVPTX64 %s
 //
+// NVPTX64:#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
 // NVPTX64:#define __CHAR16_TYPE__ unsigned short
 // NVPTX64:#define __CHAR32_TYPE__ unsigned int
 // NVPTX64:#define __CHAR_BIT__ 8
@@ -1187,6 +1200,7 @@
 // PPC603E:#define _ARCH_PPCGR 1
 // PPC603E:#define _BIG_ENDIAN 1
 // PPC603E:#define __BIG_ENDIAN__ 1
+// PPC603E:#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
 // PPC603E:#define __CHAR16_TYPE__ unsigned short
 // PPC603E:#define __CHAR32_TYPE__ unsigned int
 // PPC603E:#define __CHAR_BIT__ 8
@@ -1293,6 +1307,7 @@
 // PPC64:#define _BIG_ENDIAN 1
 // PPC64:#define _LP64 1
 // PPC64:#define __BIG_ENDIAN__ 1
+// PPC64:#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
 // PPC64:#define __CHAR16_TYPE__ unsigned short
 // PPC64:#define __CHAR32_TYPE__ unsigned int
 // PPC64:#define __CHAR_BIT__ 8
@@ -1395,6 +1410,7 @@
 // PPC64-LINUX:#define _BIG_ENDIAN 1
 // PPC64-LINUX:#define _LP64 1
 // PPC64-LINUX:#define __BIG_ENDIAN__ 1
+// PPC64-LINUX:#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
 // PPC64-LINUX:#define __CHAR16_TYPE__ unsigned short
 // PPC64-LINUX:#define __CHAR32_TYPE__ unsigned int
 // PPC64-LINUX:#define __CHAR_BIT__ 8
@@ -1498,6 +1514,7 @@
 // PPC:#define _ARCH_PPC 1
 // PPC:#define _BIG_ENDIAN 1
 // PPC:#define __BIG_ENDIAN__ 1
+// PPC:#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
 // PPC:#define __CHAR16_TYPE__ unsigned short
 // PPC:#define __CHAR32_TYPE__ unsigned int
 // PPC:#define __CHAR_BIT__ 8
@@ -1596,6 +1613,7 @@
 // PPC-LINUX:#define _ARCH_PPC 1
 // PPC-LINUX:#define _BIG_ENDIAN 1
 // PPC-LINUX:#define __BIG_ENDIAN__ 1
+// PPC-LINUX:#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
 // PPC-LINUX:#define __CHAR16_TYPE__ unsigned short
 // PPC-LINUX:#define __CHAR32_TYPE__ unsigned int
 // PPC-LINUX:#define __CHAR_BIT__ 8
@@ -1693,6 +1711,7 @@
 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=sparc-none-none < /dev/null | FileCheck -check-prefix SPARC %s
 //
+// SPARC:#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
 // SPARC:#define __CHAR16_TYPE__ unsigned short
 // SPARC:#define __CHAR32_TYPE__ unsigned int
 // SPARC:#define __CHAR_BIT__ 8
@@ -1788,6 +1807,7 @@
 // 
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=tce-none-none < /dev/null | FileCheck -check-prefix TCE %s
 //
+// TCE:#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
 // TCE:#define __CHAR16_TYPE__ unsigned short
 // TCE:#define __CHAR32_TYPE__ unsigned int
 // TCE:#define __CHAR_BIT__ 8
@@ -1881,6 +1901,7 @@
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=x86_64-none-none < /dev/null | FileCheck -check-prefix X86_64 %s
 //
 // X86_64:#define _LP64 1
+// X86_64:#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
 // X86_64:#define __CHAR16_TYPE__ unsigned short
 // X86_64:#define __CHAR32_TYPE__ unsigned int
 // X86_64:#define __CHAR_BIT__ 8
@@ -1984,6 +2005,7 @@
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=x86_64-pc-linux-gnu < /dev/null | FileCheck -check-prefix X86_64-LINUX %s
 //
 // X86_64-LINUX:#define _LP64 1
+// X86_64-LINUX:#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
 // X86_64-LINUX:#define __CHAR16_TYPE__ unsigned short
 // X86_64-LINUX:#define __CHAR32_TYPE__ unsigned int
 // X86_64-LINUX:#define __CHAR_BIT__ 8