Subzero: Add basic ELFObjectWriter (text section, symtab, strtab, headers)

src/IceTypes.def

 //===- subzero/src/IceTypes.def - X-macros for ICE types --------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines properties of ICE primitive types in the form of
 // x-macros.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICETYPES_DEF
 #define SUBZERO_SRC_ICETYPES_DEF
 
-#define TARGETARCH_TABLE                                                 \
-  /* enum value, printable string */                                     \
-  X(Target_X8632, "x86-32")                                              \
-  X(Target_X8664, "x86-64")                                              \
-  X(Target_ARM32, "arm32")                                               \
-  X(Target_ARM64, "arm64")                                               \
-//#define X(tag, str)
+// Attributes of each target architecture.
+// NOTE on is_elf64 -- At some point NaCl would like to use ELF32 for all
+// ILP32 sandboxes, but for now the 64-bit architectures use ELF64:
+// https://code.google.com/p/nativeclient/issues/detail?id=349
+// TODO: Whoever adds AArch64 will need to set ABI e_flags.
+#define TARGETARCH_TABLE                                                \
+  /* enum value, printable string, is_elf64, e_machine, e_flags */      \
+  X(Target_X8632, "x86-32", false, EM_386,    0)                        \
+  X(Target_X8664, "x86-64", true,  EM_X86_64, 0)                        \
+  X(Target_ARM32, "arm32",  false, EM_ARM,    EF_ARM_EABI_VER5)         \
+  X(Target_ARM64, "arm64",  true,  EM_AARCH64, 0)                       \
+  //#define X(tag, str, is_elf64, e_machine, e_flags)
 
 #define ICETYPE_TABLE                                                    \
   /* enum value,  size, align, # elts, element type, printable string */ \
   /*   (size and alignment in bytes) */                                  \
   X(IceType_void,   0,  0,     1,      IceType_void, "void")             \
   X(IceType_i1,     1,  1,     1,      IceType_i1,   "i1")               \
   X(IceType_i8,     1,  1,     1,      IceType_i8,   "i8")               \
   X(IceType_i16,    2,  1,     1,      IceType_i16,  "i16")              \
   X(IceType_i32,    4,  1,     1,      IceType_i32,  "i32")              \
   X(IceType_i64,    8,  1,     1,      IceType_i64,  "i64")              \
@@ skipping 29 matching lines @@
   X(IceType_v4i1,  1, 1, 0, 0, 0, IceType_v4i1)                          \
   X(IceType_v8i1,  1, 1, 0, 0, 0, IceType_v8i1)                          \
   X(IceType_v16i1, 1, 1, 0, 0, 0, IceType_v16i1)                         \
   X(IceType_v16i8, 1, 1, 0, 1, 1, IceType_v16i1)                         \
   X(IceType_v8i16, 1, 1, 0, 1, 1, IceType_v8i1)                          \
   X(IceType_v4i32, 1, 1, 0, 1, 1, IceType_v4i1)                          \
   X(IceType_v4f32, 1, 0, 1, 0, 1, IceType_v4i1)                          \
 //#define X(tag, IsVec, IsInt, IsFloat, IsIntArith, IsLoadStore, CompareResult)
 
 #endif // SUBZERO_SRC_ICETYPES_DEF