Moved construction of TargetInfo objects out of the Driver

and into the "Basic" library. TargetInfo objects are now
constructed from triples by calling the static method
TargetInfo::CreateTargetInfo.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@44940 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 731 insertions, 0 deletions

diff --git a/Basic/Targets.cpp b/Basic/Targets.cpp
new file mode 100644
index 0000000000..ed29c9000a
--- /dev/null
+++ b/Basic/Targets.cpp
@@ -0,0 +1,731 @@
+//===--- Targets.cpp - Implement -arch option and targets -----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Chris Lattner and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements construction of a TargetInfo object from a 
+// target triple.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/Builtins.h"
+#include "clang/AST/TargetBuiltins.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/TargetInfo.h"
+#include "llvm/ADT/STLExtras.h"
+
+using namespace clang;
+
+//===----------------------------------------------------------------------===//
+//  Common code shared among targets.
+//===----------------------------------------------------------------------===//
+
+static void Define(std::vector<char> &Buf, const char *Macro,
+                   const char *Val = "1") {
+  const char *Def = "#define ";
+  Buf.insert(Buf.end(), Def, Def+strlen(Def));
+  Buf.insert(Buf.end(), Macro, Macro+strlen(Macro));
+  Buf.push_back(' ');
+  Buf.insert(Buf.end(), Val, Val+strlen(Val));
+  Buf.push_back('\n');
+}
+
+
+namespace {
+class DarwinTargetInfo : public TargetInfoImpl {
+public:
+  DarwinTargetInfo(const std::string& triple) : TargetInfoImpl(triple) {}
+  
+  virtual void getTargetDefines(std::vector<char> &Defs) const {
+// FIXME: we need a real target configuration system.  For now, only define
+// __APPLE__ if the host has it.
+#ifdef __APPLE__
+    Define(Defs, "__APPLE__");
+    Define(Defs, "__MACH__");
+#endif
+    
+    if (1) {// -fobjc-gc controls this.
+      Define(Defs, "__weak", "");
+      Define(Defs, "__strong", "");
+    } else {
+      Define(Defs, "__weak", "__attribute__((objc_gc(weak)))");
+      Define(Defs, "__strong", "__attribute__((objc_gc(strong)))");
+      Define(Defs, "__OBJC_GC__");
+    }
+
+    // darwin_constant_cfstrings controls this.
+    Define(Defs, "__CONSTANT_CFSTRINGS__");
+    
+    if (0)  // darwin_pascal_strings
+      Define(Defs, "__PASCAL_STRINGS__");
+  }
+
+};
+} // end anonymous namespace.
+
+
+/// getPowerPCDefines - Return a set of the PowerPC-specific #defines that are
+/// not tied to a specific subtarget.
+static void getPowerPCDefines(std::vector<char> &Defs, bool is64Bit) {
+  // Target identification.
+  Define(Defs, "__ppc__");
+  Define(Defs, "_ARCH_PPC");
+  Define(Defs, "__POWERPC__");
+  if (is64Bit) {
+    Define(Defs, "_ARCH_PPC64");
+    Define(Defs, "_LP64");
+    Define(Defs, "__LP64__");
+    Define(Defs, "__ppc64__");
+  } else {
+    Define(Defs, "__ppc__");
+  }
+
+  // Target properties.
+  Define(Defs, "_BIG_ENDIAN");
+  Define(Defs, "__BIG_ENDIAN__");
+
+  if (is64Bit) {
+    Define(Defs, "__INTMAX_MAX__", "9223372036854775807L");
+    Define(Defs, "__INTMAX_TYPE__", "long int");
+    Define(Defs, "__LONG_MAX__", "9223372036854775807L");
+    Define(Defs, "__PTRDIFF_TYPE__", "long int");
+    Define(Defs, "__UINTMAX_TYPE__", "long unsigned int");
+  } else {
+    Define(Defs, "__INTMAX_MAX__", "9223372036854775807LL");
+    Define(Defs, "__INTMAX_TYPE__", "long long int");
+    Define(Defs, "__LONG_MAX__", "2147483647L");
+    Define(Defs, "__PTRDIFF_TYPE__", "int");
+    Define(Defs, "__UINTMAX_TYPE__", "long long unsigned int");
+  }
+  Define(Defs, "__INT_MAX__", "2147483647");
+  Define(Defs, "__LONG_LONG_MAX__", "9223372036854775807LL");
+  Define(Defs, "__CHAR_BIT__", "8");
+  Define(Defs, "__SCHAR_MAX__", "127");
+  Define(Defs, "__SHRT_MAX__", "32767");
+  Define(Defs, "__SIZE_TYPE__", "long unsigned int");
+  
+  // Subtarget options.
+  Define(Defs, "__USER_LABEL_PREFIX__", "_");
+  Define(Defs, "__NATURAL_ALIGNMENT__");
+  Define(Defs, "__REGISTER_PREFIX__", "");
+
+  Define(Defs, "__WCHAR_MAX__", "2147483647");
+  Define(Defs, "__WCHAR_TYPE__", "int");
+  Define(Defs, "__WINT_TYPE__", "int");
+  
+  // Float macros.
+  Define(Defs, "__FLT_DENORM_MIN__", "1.40129846e-45F");
+  Define(Defs, "__FLT_DIG__", "6");
+  Define(Defs, "__FLT_EPSILON__", "1.19209290e-7F");
+  Define(Defs, "__FLT_EVAL_METHOD__", "0");
+  Define(Defs, "__FLT_HAS_INFINITY__");
+  Define(Defs, "__FLT_HAS_QUIET_NAN__");
+  Define(Defs, "__FLT_MANT_DIG__", "24");
+  Define(Defs, "__FLT_MAX_10_EXP__", "38");
+  Define(Defs, "__FLT_MAX_EXP__", "128");
+  Define(Defs, "__FLT_MAX__", "3.40282347e+38F");
+  Define(Defs, "__FLT_MIN_10_EXP__", "(-37)");
+  Define(Defs, "__FLT_MIN_EXP__", "(-125)");
+  Define(Defs, "__FLT_MIN__", "1.17549435e-38F");
+  Define(Defs, "__FLT_RADIX__", "2");
+  
+  // double macros.
+  Define(Defs, "__DBL_DENORM_MIN__", "4.9406564584124654e-324");
+  Define(Defs, "__DBL_DIG__", "15");
+  Define(Defs, "__DBL_EPSILON__", "2.2204460492503131e-16");
+  Define(Defs, "__DBL_HAS_INFINITY__");
+  Define(Defs, "__DBL_HAS_QUIET_NAN__");
+  Define(Defs, "__DBL_MANT_DIG__", "53");
+  Define(Defs, "__DBL_MAX_10_EXP__", "308");
+  Define(Defs, "__DBL_MAX_EXP__", "1024");
+  Define(Defs, "__DBL_MAX__", "1.7976931348623157e+308");
+  Define(Defs, "__DBL_MIN_10_EXP__", "(-307)");
+  Define(Defs, "__DBL_MIN_EXP__", "(-1021)");
+  Define(Defs, "__DBL_MIN__", "2.2250738585072014e-308");
+  Define(Defs, "__DECIMAL_DIG__", "33");
+  
+  // 128-bit long double macros.
+  Define(Defs, "__LDBL_DENORM_MIN__",
+         "4.94065645841246544176568792868221e-324L");
+  Define(Defs, "__LDBL_DIG__", "31");
+  Define(Defs, "__LDBL_EPSILON__",
+         "4.94065645841246544176568792868221e-324L");
+  Define(Defs, "__LDBL_HAS_INFINITY__");
+  Define(Defs, "__LDBL_HAS_QUIET_NAN__");
+  Define(Defs, "__LDBL_MANT_DIG__", "106");
+  Define(Defs, "__LDBL_MAX_10_EXP__", "308");
+  Define(Defs, "__LDBL_MAX_EXP__", "1024");
+  Define(Defs, "__LDBL_MAX__",
+         "1.79769313486231580793728971405301e+308L");
+  Define(Defs, "__LDBL_MIN_10_EXP__", "(-291)");
+  Define(Defs, "__LDBL_MIN_EXP__", "(-968)");
+  Define(Defs, "__LDBL_MIN__",
+         "2.00416836000897277799610805135016e-292L");
+  Define(Defs, "__LONG_DOUBLE_128__");
+}
+
+/// getX86Defines - Return a set of the X86-specific #defines that are
+/// not tied to a specific subtarget.
+static void getX86Defines(std::vector<char> &Defs, bool is64Bit) {
+  // Target identification.
+  if (is64Bit) {
+    Define(Defs, "_LP64");
+    Define(Defs, "__LP64__");
+    Define(Defs, "__amd64__");
+    Define(Defs, "__amd64");
+    Define(Defs, "__x86_64");
+    Define(Defs, "__x86_64__");
+  } else {
+    Define(Defs, "__i386__");
+    Define(Defs, "__i386");
+    Define(Defs, "i386");
+  }
+
+  // Target properties.
+  Define(Defs, "__LITTLE_ENDIAN__");
+  
+  if (is64Bit) {
+    Define(Defs, "__INTMAX_MAX__", "9223372036854775807L");
+    Define(Defs, "__INTMAX_TYPE__", "long int");
+    Define(Defs, "__LONG_MAX__", "9223372036854775807L");
+    Define(Defs, "__PTRDIFF_TYPE__", "long int");
+    Define(Defs, "__UINTMAX_TYPE__", "long unsigned int");
+  } else {
+    Define(Defs, "__INTMAX_MAX__", "9223372036854775807LL");
+    Define(Defs, "__INTMAX_TYPE__", "long long int");
+    Define(Defs, "__LONG_MAX__", "2147483647L");
+    Define(Defs, "__PTRDIFF_TYPE__", "int");
+    Define(Defs, "__UINTMAX_TYPE__", "long long unsigned int");
+  }
+  Define(Defs, "__CHAR_BIT__", "8");
+  Define(Defs, "__INT_MAX__", "2147483647");
+  Define(Defs, "__LONG_LONG_MAX__", "9223372036854775807LL");
+  Define(Defs, "__SCHAR_MAX__", "127");
+  Define(Defs, "__SHRT_MAX__", "32767");
+  Define(Defs, "__SIZE_TYPE__", "long unsigned int");
+  
+  // Subtarget options.
+  Define(Defs, "__nocona");
+  Define(Defs, "__nocona__");
+  Define(Defs, "__tune_nocona__");
+  Define(Defs, "__SSE2_MATH__");
+  Define(Defs, "__SSE2__");
+  Define(Defs, "__SSE_MATH__");
+  Define(Defs, "__SSE__");
+  Define(Defs, "__MMX__");
+  Define(Defs, "__REGISTER_PREFIX__", "");
+
+  Define(Defs, "__WCHAR_MAX__", "2147483647");
+  Define(Defs, "__WCHAR_TYPE__", "int");
+  Define(Defs, "__WINT_TYPE__", "int");
+  
+  // Float macros.
+  Define(Defs, "__FLT_DENORM_MIN__", "1.40129846e-45F");
+  Define(Defs, "__FLT_DIG__", "6");
+  Define(Defs, "__FLT_EPSILON__", "1.19209290e-7F");
+  Define(Defs, "__FLT_EVAL_METHOD__", "0");
+  Define(Defs, "__FLT_HAS_INFINITY__");
+  Define(Defs, "__FLT_HAS_QUIET_NAN__");
+  Define(Defs, "__FLT_MANT_DIG__", "24");
+  Define(Defs, "__FLT_MAX_10_EXP__", "38");
+  Define(Defs, "__FLT_MAX_EXP__", "128");
+  Define(Defs, "__FLT_MAX__", "3.40282347e+38F");
+  Define(Defs, "__FLT_MIN_10_EXP__", "(-37)");
+  Define(Defs, "__FLT_MIN_EXP__", "(-125)");
+  Define(Defs, "__FLT_MIN__", "1.17549435e-38F");
+  Define(Defs, "__FLT_RADIX__", "2");
+  
+  // Double macros.
+  Define(Defs, "__DBL_DENORM_MIN__", "4.9406564584124654e-324");
+  Define(Defs, "__DBL_DIG__", "15");
+  Define(Defs, "__DBL_EPSILON__", "2.2204460492503131e-16");
+  Define(Defs, "__DBL_HAS_INFINITY__");
+  Define(Defs, "__DBL_HAS_QUIET_NAN__");
+  Define(Defs, "__DBL_MANT_DIG__", "53");
+  Define(Defs, "__DBL_MAX_10_EXP__", "308");
+  Define(Defs, "__DBL_MAX_EXP__", "1024");
+  Define(Defs, "__DBL_MAX__", "1.7976931348623157e+308");
+  Define(Defs, "__DBL_MIN_10_EXP__", "(-307)");
+  Define(Defs, "__DBL_MIN_EXP__", "(-1021)");
+  Define(Defs, "__DBL_MIN__", "2.2250738585072014e-308");
+  Define(Defs, "__DECIMAL_DIG__", "21");
+  
+  // 80-bit Long double macros.
+  Define(Defs, "__LDBL_DENORM_MIN__", "3.64519953188247460253e-4951L");
+  Define(Defs, "__LDBL_DIG__", "18");
+  Define(Defs, "__LDBL_EPSILON__", "1.08420217248550443401e-19L");
+  Define(Defs, "__LDBL_HAS_INFINITY__");
+  Define(Defs, "__LDBL_HAS_QUIET_NAN__");
+  Define(Defs, "__LDBL_MANT_DIG__", "64");
+  Define(Defs, "__LDBL_MAX_10_EXP__", "4932");
+  Define(Defs, "__LDBL_MAX_EXP__", "16384");
+  Define(Defs, "__LDBL_MAX__", "1.18973149535723176502e+4932L");
+  Define(Defs, "__LDBL_MIN_10_EXP__", "(-4931)");
+  Define(Defs, "__LDBL_MIN_EXP__", "(-16381)");
+  Define(Defs, "__LDBL_MIN__", "3.36210314311209350626e-4932L");
+}
+
+static const char* getI386VAListDeclaration() {
+  return "typedef char* __builtin_va_list;";
+}
+
+static const char* getX86_64VAListDeclaration() {
+  return 
+    "typedef struct __va_list_tag {"
+    "  unsigned gp_offset;"
+    "  unsigned fp_offset;"
+    "  void* overflow_arg_area;"
+    "  void* reg_save_area;"
+    "} __builtin_va_list[1];";
+}
+
+static const char* getPPCVAListDeclaration() {
+  return 
+    "typedef struct __va_list_tag {"
+    "  unsigned char gpr;"
+    "  unsigned char fpr;"
+    "  unsigned short reserved;"
+    "  void* overflow_arg_area;"
+    "  void* reg_save_area;"
+    "} __builtin_va_list[1];";
+}
+
+
+/// PPC builtin info.
+namespace clang {
+namespace PPC {
+  
+  static const Builtin::Info BuiltinInfo[] = {
+#define BUILTIN(ID, TYPE, ATTRS) { #ID, TYPE, ATTRS },
+#include "clang/AST/PPCBuiltins.def"
+  };
+  
+  static void getBuiltins(const Builtin::Info *&Records, unsigned &NumRecords) {
+    Records = BuiltinInfo;
+    NumRecords = LastTSBuiltin-Builtin::FirstTSBuiltin;
+  }
+
+  static const char * const GCCRegNames[] = {
+    "0", "1", "2", "3", "4", "5", "6", "7",
+    "8", "9", "10", "11", "12", "13", "14", "15",
+    "16", "17", "18", "19", "20", "21", "22", "23",
+    "24", "25", "26", "27", "28", "29", "30", "31",
+    "0", "1", "2", "3", "4", "5", "6", "7",
+    "8", "9", "10", "11", "12", "13", "14", "15",
+    "16", "17", "18", "19", "20", "21", "22", "23",
+    "24", "25", "26", "27", "28", "29", "30", "31",
+    "mq", "lr", "ctr", "ap",
+    "0", "1", "2", "3", "4", "5", "6", "7",
+    "xer",
+    "0", "1", "2", "3", "4", "5", "6", "7",
+    "8", "9", "10", "11", "12", "13", "14", "15",
+    "16", "17", "18", "19", "20", "21", "22", "23",
+    "24", "25", "26", "27", "28", "29", "30", "31",
+    "vrsave", "vscr",
+    "spe_acc", "spefscr",
+    "sfp"
+  };
+
+  static void getGCCRegNames(const char * const *&Names, 
+                                  unsigned &NumNames) {
+    Names = GCCRegNames;
+    NumNames = llvm::array_lengthof(GCCRegNames);
+  }
+
+  static const TargetInfoImpl::GCCRegAlias GCCRegAliases[] = {
+    // While some of these aliases do map to different registers
+    // they still share the same register name.
+    { { "cc", "cr0", "fr0", "r0", "v0"}, "0" }, 
+    { { "cr1", "fr1", "r1", "sp", "v1"}, "1" }, 
+    { { "cr2", "fr2", "r2", "toc", "v2"}, "2" }, 
+    { { "cr3", "fr3", "r3", "v3"}, "3" }, 
+    { { "cr4", "fr4", "r4", "v4"}, "4" }, 
+    { { "cr5", "fr5", "r5", "v5"}, "5" }, 
+    { { "cr6", "fr6", "r6", "v6"}, "6" }, 
+    { { "cr7", "fr7", "r7", "v7"}, "7" }, 
+    { { "fr8", "r8", "v8"}, "8" }, 
+    { { "fr9", "r9", "v9"}, "9" }, 
+    { { "fr10", "r10", "v10"}, "10" }, 
+    { { "fr11", "r11", "v11"}, "11" }, 
+    { { "fr12", "r12", "v12"}, "12" }, 
+    { { "fr13", "r13", "v13"}, "13" }, 
+    { { "fr14", "r14", "v14"}, "14" }, 
+    { { "fr15", "r15", "v15"}, "15" }, 
+    { { "fr16", "r16", "v16"}, "16" }, 
+    { { "fr17", "r17", "v17"}, "17" }, 
+    { { "fr18", "r18", "v18"}, "18" }, 
+    { { "fr19", "r19", "v19"}, "19" }, 
+    { { "fr20", "r20", "v20"}, "20" }, 
+    { { "fr21", "r21", "v21"}, "21" }, 
+    { { "fr22", "r22", "v22"}, "22" }, 
+    { { "fr23", "r23", "v23"}, "23" }, 
+    { { "fr24", "r24", "v24"}, "24" }, 
+    { { "fr25", "r25", "v25"}, "25" }, 
+    { { "fr26", "r26", "v26"}, "26" }, 
+    { { "fr27", "r27", "v27"}, "27" }, 
+    { { "fr28", "r28", "v28"}, "28" }, 
+    { { "fr29", "r29", "v29"}, "29" }, 
+    { { "fr30", "r30", "v30"}, "30" }, 
+    { { "fr31", "r31", "v31"}, "31" }, 
+  };
+  
+  static void getGCCRegAliases(const TargetInfoImpl::GCCRegAlias *&Aliases, 
+                               unsigned &NumAliases) {
+    Aliases = GCCRegAliases;
+    NumAliases = llvm::array_lengthof(GCCRegAliases);
+  }
+  
+  static bool validateAsmConstraint(char c, 
+                                    TargetInfo::ConstraintInfo &info) {
+    switch (c) {
+    default: return false;
+    case 'O': // Zero
+      return true;
+    case 'b': // Base register
+    case 'f': // Floating point register
+      info = (TargetInfo::ConstraintInfo)(info|TargetInfo::CI_AllowsRegister);
+      return true;
+    }
+  }
+  
+  const char *getClobbers() {
+    return 0;
+  }
+
+  const char *getTargetPrefix() {
+    return "ppc";
+  }
+  
+} // End namespace PPC
+
+/// X86 builtin info.
+namespace X86 {
+  static const Builtin::Info BuiltinInfo[] = {
+#define BUILTIN(ID, TYPE, ATTRS) { #ID, TYPE, ATTRS },
+#include "clang/AST/X86Builtins.def"
+  };
+
+  static void getBuiltins(const Builtin::Info *&Records, unsigned &NumRecords) {
+    Records = BuiltinInfo;
+    NumRecords = LastTSBuiltin-Builtin::FirstTSBuiltin;
+  }
+    
+  static const char *GCCRegNames[] = {
+    "ax", "dx", "cx", "bx", "si", "di", "bp", "sp",
+    "st", "st(1)", "st(2)", "st(3)", "st(4)", "st(5)", "st(6)", "st(7)",
+    "argp", "flags", "fspr", "dirflag", "frame",
+    "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7",
+    "mm0", "mm1", "mm2", "mm3", "mm4", "mm5", "mm6", "mm7",
+    "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+    "xmm8", "xmm9", "xmm10", "xmm11", "xmm12", "xmm13", "xmm14", "xmm15"
+  };
+  
+  static void getGCCRegNames(const char * const *&Names, 
+                                  unsigned &NumNames) {
+    Names = GCCRegNames;
+    NumNames = llvm::array_lengthof(GCCRegNames);
+  }
+  
+  static const TargetInfoImpl::GCCRegAlias GCCRegAliases[] = {
+    { { "al", "ah", "eax", "rax" }, "ax" },
+    { { "bl", "bh", "ebx", "rbx" }, "bx" },
+    { { "cl", "ch", "ecx", "rcx" }, "cx" },
+    { { "dl", "dh", "edx", "rdx" }, "dx" },
+    { { "esi", "rsi" }, "si" },
+    { { "esp", "rsp" }, "sp" },
+    { { "ebp", "rbp" }, "bp" },
+  };
+
+  static void getGCCRegAliases(const TargetInfoImpl::GCCRegAlias *&Aliases, 
+                               unsigned &NumAliases) {
+    Aliases = GCCRegAliases;
+    NumAliases = llvm::array_lengthof(GCCRegAliases);
+  }  
+  
+  static bool validateAsmConstraint(char c, 
+                                    TargetInfo::ConstraintInfo &info) {
+    switch (c) {
+    default: return false;
+    case 'a': // eax.
+    case 'b': // ebx.
+    case 'c': // ecx.
+    case 'd': // edx.
+    case 'S': // esi.
+    case 'D': // edi.
+    case 'A': // edx:eax.
+    case 't': // top of floating point stack.
+    case 'u': // second from top of floating point stack.
+    case 'q': // a, b, c, d registers or any integer register in 64-bit.
+      info = (TargetInfo::ConstraintInfo)(info|TargetInfo::CI_AllowsRegister);
+      return true;
+    }
+  }
+
+  const char *getClobbers() {
+    return "~{dirflag},~{fpsr},~{flags}";
+  }
+  
+  const char *getTargetPrefix() {
+    return "x86";
+  }
+  
+} // End namespace X86
+} // end namespace clang.
+
+//===----------------------------------------------------------------------===//
+// Specific target implementations.
+//===----------------------------------------------------------------------===//
+
+
+namespace {
+class DarwinPPCTargetInfo : public DarwinTargetInfo {
+public:
+  DarwinPPCTargetInfo(const std::string& triple) : DarwinTargetInfo(triple) {}
+  
+  virtual void getTargetDefines(std::vector<char> &Defines) const {
+    DarwinTargetInfo::getTargetDefines(Defines);
+    getPowerPCDefines(Defines, false);
+  }
+  virtual void getTargetBuiltins(const Builtin::Info *&Records,
+                                 unsigned &NumRecords) const {
+    PPC::getBuiltins(Records, NumRecords);
+  }
+  virtual const char *getVAListDeclaration() const {
+    return getPPCVAListDeclaration();
+  }
+  virtual const char *getTargetPrefix() const {
+    return PPC::getTargetPrefix();
+  }
+  virtual void getGCCRegNames(const char * const *&Names, 
+                              unsigned &NumNames) const {
+    PPC::getGCCRegNames(Names, NumNames);
+  }
+  virtual void getGCCRegAliases(const GCCRegAlias *&Aliases, 
+                                unsigned &NumAliases) const {
+    PPC::getGCCRegAliases(Aliases, NumAliases);
+  }
+  virtual bool validateAsmConstraint(char c,
+                                     TargetInfo::ConstraintInfo &info) const {
+    return PPC::validateAsmConstraint(c, info);
+  }
+  virtual const char *getClobbers() const {
+    return PPC::getClobbers();
+  }
+};
+} // end anonymous namespace.
+
+namespace {
+class DarwinPPC64TargetInfo : public DarwinTargetInfo {
+public:
+  DarwinPPC64TargetInfo(const std::string& triple) : DarwinTargetInfo(triple) {}
+  
+  virtual void getTargetDefines(std::vector<char> &Defines) const {
+    DarwinTargetInfo::getTargetDefines(Defines);
+    getPowerPCDefines(Defines, true);
+  }
+  virtual void getTargetBuiltins(const Builtin::Info *&Records,
+                                 unsigned &NumRecords) const {
+    PPC::getBuiltins(Records, NumRecords);
+  }
+  virtual const char *getVAListDeclaration() const {
+    return getPPCVAListDeclaration();
+  }  
+  virtual const char *getTargetPrefix() const {
+    return PPC::getTargetPrefix();
+  }  
+  virtual void getGCCRegNames(const char * const *&Names, 
+                                   unsigned &NumNames) const {
+    PPC::getGCCRegNames(Names, NumNames);
+  }    
+  virtual void getGCCRegAliases(const GCCRegAlias *&Aliases, 
+                                unsigned &NumAliases) const {
+    PPC::getGCCRegAliases(Aliases, NumAliases);
+  }
+  virtual bool validateAsmConstraint(char c,
+                                     TargetInfo::ConstraintInfo &info) const {
+    return PPC::validateAsmConstraint(c, info);
+  }
+  virtual const char *getClobbers() const {
+    return PPC::getClobbers();
+  }  
+};
+} // end anonymous namespace.
+
+namespace {
+class DarwinI386TargetInfo : public DarwinTargetInfo {
+public:
+  DarwinI386TargetInfo(const std::string& triple) : DarwinTargetInfo(triple) {}
+  
+  virtual void getTargetDefines(std::vector<char> &Defines) const {
+    DarwinTargetInfo::getTargetDefines(Defines);
+    getX86Defines(Defines, false);
+  }
+  virtual void getTargetBuiltins(const Builtin::Info *&Records,
+                                 unsigned &NumRecords) const {
+    X86::getBuiltins(Records, NumRecords);
+  }
+  virtual const char *getVAListDeclaration() const {
+    return getI386VAListDeclaration();
+  }  
+  virtual const char *getTargetPrefix() const {
+    return X86::getTargetPrefix();
+  }  
+  virtual void getGCCRegNames(const char * const *&Names, 
+                                   unsigned &NumNames) const {
+    X86::getGCCRegNames(Names, NumNames);
+  }
+  virtual void getGCCRegAliases(const GCCRegAlias *&Aliases, 
+                                unsigned &NumAliases) const {
+    X86::getGCCRegAliases(Aliases, NumAliases);
+  }
+  virtual bool validateAsmConstraint(char c,
+                                     TargetInfo::ConstraintInfo &info) const {
+    return X86::validateAsmConstraint(c, info);
+  }
+  virtual const char *getClobbers() const {
+    return X86::getClobbers();
+  }  
+};
+} // end anonymous namespace.
+
+namespace {
+class DarwinX86_64TargetInfo : public DarwinTargetInfo {
+public:
+  DarwinX86_64TargetInfo(const std::string& triple) :DarwinTargetInfo(triple) {}
+  
+  virtual void getTargetDefines(std::vector<char> &Defines) const {
+    DarwinTargetInfo::getTargetDefines(Defines);
+    getX86Defines(Defines, true);
+  }
+  virtual void getTargetBuiltins(const Builtin::Info *&Records,
+                                 unsigned &NumRecords) const {
+    X86::getBuiltins(Records, NumRecords);
+  }
+  virtual const char *getVAListDeclaration() const {
+    return getX86_64VAListDeclaration();
+  }
+  virtual const char *getTargetPrefix() const {
+    return X86::getTargetPrefix();
+  }
+  virtual void getGCCRegNames(const char * const *&Names, 
+                                   unsigned &NumNames) const {
+    X86::getGCCRegNames(Names, NumNames);
+  }  
+  virtual void getGCCRegAliases(const GCCRegAlias *&Aliases, 
+                                unsigned &NumAliases) const {
+    X86::getGCCRegAliases(Aliases, NumAliases);
+  }
+  virtual bool validateAsmConstraint(char c,
+                                     TargetInfo::ConstraintInfo &info) const {
+    return X86::validateAsmConstraint(c, info);
+  }  
+  virtual const char *getClobbers() const {
+    return X86::getClobbers();
+  }    
+};
+} // end anonymous namespace.
+
+namespace {
+class LinuxTargetInfo : public DarwinTargetInfo {
+public:
+  LinuxTargetInfo(const std::string& triple) : DarwinTargetInfo(triple) {
+    // Note: I have no idea if this is right, just for testing.
+    WCharWidth = 16;
+    WCharAlign = 16;
+  }
+  
+  virtual void getTargetDefines(std::vector<char> &Defines) const {
+    // TODO: linux-specific stuff.
+    getX86Defines(Defines, false);
+  }
+  virtual void getTargetBuiltins(const Builtin::Info *&Records,
+                                 unsigned &NumRecords) const {
+    X86::getBuiltins(Records, NumRecords);
+  }
+  virtual const char *getVAListDeclaration() const {
+    return getI386VAListDeclaration();
+  }
+  virtual const char *getTargetPrefix() const {
+    return X86::getTargetPrefix();
+  }  
+  virtual void getGCCRegNames(const char * const *&Names, 
+                                   unsigned &NumNames) const {
+    X86::getGCCRegNames(Names, NumNames);
+  }  
+  virtual void getGCCRegAliases(const GCCRegAlias *&Aliases, 
+                                unsigned &NumAliases) const {
+    X86::getGCCRegAliases(Aliases, NumAliases);
+  }
+  virtual bool validateAsmConstraint(char c,
+                                     TargetInfo::ConstraintInfo &info) const {
+    return X86::validateAsmConstraint(c, info);
+  }
+  virtual const char *getClobbers() const {
+    return X86::getClobbers();
+  }  
+};
+} // end anonymous namespace.
+
+
+//===----------------------------------------------------------------------===//
+// Driver code
+//===----------------------------------------------------------------------===//
+
+static inline bool IsX86(const std::string& TT) {
+  return (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' &&
+          TT[4] == '-' && TT[1] - '3' < 6);
+}
+
+/// CreateTarget - Create the TargetInfoImpl object for the specified target
+/// enum value.
+static TargetInfoImpl *CreateTarget(const std::string& T) {
+  if (T.find("ppc-") == 0 || T.find("powerpc-") == 0)
+    return new DarwinPPCTargetInfo(T);
+  else if (T.find("ppc64-") == 0 || T.find("powerpc64-") == 0)
+    return new DarwinPPC64TargetInfo(T);
+  else if (T.find("x86_64-") == 0)
+    return new DarwinX86_64TargetInfo(T);
+  else if (IsX86(T))
+    return new DarwinI386TargetInfo(T);
+  else if (T.find("bogusW16W16-") == 0) // For testing portability.
+    return new LinuxTargetInfo(T);
+  else
+    return NULL;
+}
+
+/// CreateTargetInfo - Return the set of target info objects as specified by
+/// the -arch command line option.
+TargetInfo* TargetInfo::CreateTargetInfo(SourceManager& SrcMgr,
+                                         const std::string* TriplesStart,
+                                         const std::string* TriplesEnd,
+                                         Diagnostic *Diags) {
+
+  // Create the primary target and target info.
+  TargetInfoImpl* PrimaryTarget = CreateTarget(*TriplesStart);
+
+  if (!PrimaryTarget)
+    return NULL;
+  
+  TargetInfo *TI = new TargetInfo(SrcMgr, PrimaryTarget, Diags);
+  
+  // Add all secondary targets.
+  for (const std::string* I=TriplesStart+1; I != TriplesEnd; ++I) {
+    TargetInfoImpl* SecondaryTarget = CreateTarget(*I);
+
+    if (!SecondaryTarget) {
+      fprintf (stderr,
+               "Warning: secondary target '%s' unrecognized.\n", 
+               I->c_str());
+
+      continue;
+    }
+
+    TI->AddSecondaryTarget(SecondaryTarget);
+  }
+  
+  return TI;
+}