lib/Basic/TargetInfo.cpp - clang - Git at Google

 //===--- TargetInfo.cpp - Information about Target machine ----------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 //  This file implements the TargetInfo and TargetInfoImpl interfaces.
 //
 //===----------------------------------------------------------------------===//

 #include "clang/Basic/TargetInfo.h"
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/STLExtras.h"
 #include <cstdlib>
 using namespace clang;

 // TargetInfo Constructor.
 TargetInfo::TargetInfo(const std::string &T) : Triple(T) {
   // Set defaults.  Defaults are set for a 32-bit RISC platform,
   // like PPC or SPARC.
   // These should be overridden by concrete targets as needed.
   TLSSupported = true;
   PointerWidth = PointerAlign = 32;
   WCharWidth = WCharAlign = 32;
   Char16Width = Char16Align = 16;
   Char32Width = Char32Align = 32;
   IntWidth = IntAlign = 32;
   LongWidth = LongAlign = 32;
   LongLongWidth = LongLongAlign = 64;
   FloatWidth = 32;
   FloatAlign = 32;
   DoubleWidth = 64;
   DoubleAlign = 64;
   LongDoubleWidth = 64;
   LongDoubleAlign = 64;
   IntMaxTWidth = 64;
   SizeType = UnsignedLong;
   PtrDiffType = SignedLong;
   IntMaxType = SignedLongLong;
   UIntMaxType = UnsignedLongLong;
   IntPtrType = SignedLong;
   WCharType = SignedInt;
   Char16Type = UnsignedShort;
   Char32Type = UnsignedInt;
   Int64Type = SignedLongLong;
   FloatFormat = &llvm::APFloat::IEEEsingle;
   DoubleFormat = &llvm::APFloat::IEEEdouble;
   LongDoubleFormat = &llvm::APFloat::IEEEdouble;
   DescriptionString = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-"
                       "i64:64:64-f32:32:32-f64:64:64";
   UserLabelPrefix = "_";
 }

 // Out of line virtual dtor for TargetInfo.
 TargetInfo::~TargetInfo() {}

 /// getTypeName - Return the user string for the specified integer type enum.
 /// For example, SignedShort -> "short".
 const char *TargetInfo::getTypeName(IntType T) {
   switch (T) {
   default: assert(0 && "not an integer!");
   case SignedShort:      return "short";
   case UnsignedShort:    return "unsigned short";
   case SignedInt:        return "int";
   case UnsignedInt:      return "unsigned int";
   case SignedLong:       return "long int";
   case UnsignedLong:     return "long unsigned int";
   case SignedLongLong:   return "long long int";
   case UnsignedLongLong: return "long long unsigned int";
   }
 }

 //===----------------------------------------------------------------------===//


 static void removeGCCRegisterPrefix(const char *&Name) {
   if (Name[0] == '%' || Name[0] == '#')
     Name++;
 }

 /// isValidGCCRegisterName - Returns whether the passed in string
 /// is a valid register name according to GCC. This is used by Sema for
 /// inline asm statements.
 bool TargetInfo::isValidGCCRegisterName(const char *Name) const {
   const char * const *Names;
   unsigned NumNames;

   // Get rid of any register prefix.
   removeGCCRegisterPrefix(Name);


   if (strcmp(Name, "memory") == 0 ||
       strcmp(Name, "cc") == 0)
     return true;

   getGCCRegNames(Names, NumNames);

   // If we have a number it maps to an entry in the register name array.
   if (isdigit(Name[0])) {
     char *End;
     int n = (int)strtol(Name, &End, 0);
     if (*End == 0)
       return n >= 0 && (unsigned)n < NumNames;
   }

   // Check register names.
   for (unsigned i = 0; i < NumNames; i++) {
     if (strcmp(Name, Names[i]) == 0)
       return true;
   }

   // Now check aliases.
   const GCCRegAlias *Aliases;
   unsigned NumAliases;

   getGCCRegAliases(Aliases, NumAliases);
   for (unsigned i = 0; i < NumAliases; i++) {
     for (unsigned j = 0 ; j < llvm::array_lengthof(Aliases[i].Aliases); j++) {
       if (!Aliases[i].Aliases[j])
         break;
       if (strcmp(Aliases[i].Aliases[j], Name) == 0)
         return true;
     }
   }

   return false;
 }

 const char *TargetInfo::getNormalizedGCCRegisterName(const char *Name) const {
   assert(isValidGCCRegisterName(Name) && "Invalid register passed in");

   removeGCCRegisterPrefix(Name);

   const char * const *Names;
   unsigned NumNames;

   getGCCRegNames(Names, NumNames);

   // First, check if we have a number.
   if (isdigit(Name[0])) {
     char *End;
     int n = (int)strtol(Name, &End, 0);
     if (*End == 0) {
       assert(n >= 0 && (unsigned)n < NumNames &&
              "Out of bounds register number!");
       return Names[n];
     }
   }

   // Now check aliases.
   const GCCRegAlias *Aliases;
   unsigned NumAliases;

   getGCCRegAliases(Aliases, NumAliases);
   for (unsigned i = 0; i < NumAliases; i++) {
     for (unsigned j = 0 ; j < llvm::array_lengthof(Aliases[i].Aliases); j++) {
       if (!Aliases[i].Aliases[j])
         break;
       if (strcmp(Aliases[i].Aliases[j], Name) == 0)
         return Aliases[i].Register;
     }
   }

   return Name;
 }

 bool TargetInfo::validateOutputConstraint(ConstraintInfo &Info) const {
   const char *Name = Info.getConstraintStr().c_str();
   // An output constraint must start with '=' or '+'
   if (*Name != '=' && *Name != '+')
     return false;

   if (*Name == '+')
     Info.setIsReadWrite();

   Name++;
   while (*Name) {
     switch (*Name) {
     default:
       if (!validateAsmConstraint(Name, Info)) {
         // FIXME: We temporarily return false
         // so we can add more constraints as we hit it.
         // Eventually, an unknown constraint should just be treated as 'g'.
         return false;
       }
     case '&': // early clobber.
       break;
     case 'r': // general register.
       Info.setAllowsRegister();
       break;
     case 'm': // memory operand.
       Info.setAllowsMemory();
       break;
     case 'g': // general register, memory operand or immediate integer.
     case 'X': // any operand.
       Info.setAllowsRegister();
       Info.setAllowsMemory();
       break;
     }

     Name++;
   }

   return true;
 }

 bool TargetInfo::resolveSymbolicName(const char *&Name,
                                      ConstraintInfo *OutputConstraints,
                                      unsigned NumOutputs,
                                      unsigned &Index) const {
   assert(*Name == '[' && "Symbolic name did not start with '['");
   Name++;
   const char *Start = Name;
   while (*Name && *Name != ']')
     Name++;

   if (!*Name) {
     // Missing ']'
     return false;
   }

   std::string SymbolicName(Start, Name - Start);

   for (Index = 0; Index != NumOutputs; ++Index)
     if (SymbolicName == OutputConstraints[Index].getName())
       return true;

   return false;
 }

 bool TargetInfo::validateInputConstraint(ConstraintInfo *OutputConstraints,
                                          unsigned NumOutputs,
                                          ConstraintInfo &Info) const {
   const char *Name = Info.ConstraintStr.c_str();

   while (*Name) {
     switch (*Name) {
     default:
       // Check if we have a matching constraint
       if (*Name >= '0' && *Name <= '9') {
         unsigned i = *Name - '0';

         // Check if matching constraint is out of bounds.
         if (i >= NumOutputs)
           return false;

         // The constraint should have the same info as the respective
         // output constraint.
         Info.setTiedOperand(i, OutputConstraints[i]);
       } else if (!validateAsmConstraint(Name, Info)) {
         // FIXME: This error return is in place temporarily so we can
         // add more constraints as we hit it.  Eventually, an unknown
         // constraint should just be treated as 'g'.
         return false;
       }
       break;
     case '[': {
       unsigned Index = 0;
       if (!resolveSymbolicName(Name, OutputConstraints, NumOutputs, Index))
         return false;

       break;
     }
     case '%': // commutative
       // FIXME: Fail if % is used with the last operand.
       break;
     case 'i': // immediate integer.
     case 'n': // immediate integer with a known value.
       break;
     case 'I':  // Various constant constraints with target-specific meanings.
     case 'J':
     case 'K':
     case 'L':
     case 'M':
     case 'N':
     case 'O':
     case 'P':
       break;
     case 'r': // general register.
       Info.setAllowsRegister();
       break;
     case 'm': // memory operand.
       Info.setAllowsMemory();
       break;
     case 'g': // general register, memory operand or immediate integer.
     case 'X': // any operand.
       Info.setAllowsRegister();
       Info.setAllowsMemory();
       break;
     }

     Name++;
   }

   return true;
 }
	//===--- TargetInfo.cpp - Information about Target machine ----------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// This file implements the TargetInfo and TargetInfoImpl interfaces.
	//
	//===----------------------------------------------------------------------===//

	#include "clang/Basic/TargetInfo.h"
	#include "llvm/ADT/APFloat.h"
	#include "llvm/ADT/STLExtras.h"
	#include <cstdlib>
	using namespace clang;

	// TargetInfo Constructor.
	TargetInfo::TargetInfo(const std::string &T) : Triple(T) {
	// Set defaults. Defaults are set for a 32-bit RISC platform,
	// like PPC or SPARC.
	// These should be overridden by concrete targets as needed.
	TLSSupported = true;
	PointerWidth = PointerAlign = 32;
	WCharWidth = WCharAlign = 32;
	Char16Width = Char16Align = 16;
	Char32Width = Char32Align = 32;
	IntWidth = IntAlign = 32;
	LongWidth = LongAlign = 32;
	LongLongWidth = LongLongAlign = 64;
	FloatWidth = 32;
	FloatAlign = 32;
	DoubleWidth = 64;
	DoubleAlign = 64;
	LongDoubleWidth = 64;
	LongDoubleAlign = 64;
	IntMaxTWidth = 64;
	SizeType = UnsignedLong;
	PtrDiffType = SignedLong;
	IntMaxType = SignedLongLong;
	UIntMaxType = UnsignedLongLong;
	IntPtrType = SignedLong;
	WCharType = SignedInt;
	Char16Type = UnsignedShort;
	Char32Type = UnsignedInt;
	Int64Type = SignedLongLong;
	FloatFormat = &llvm::APFloat::IEEEsingle;
	DoubleFormat = &llvm::APFloat::IEEEdouble;
	LongDoubleFormat = &llvm::APFloat::IEEEdouble;
	DescriptionString = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-"
	"i64:64:64-f32:32:32-f64:64:64";
	UserLabelPrefix = "_";
	}

	// Out of line virtual dtor for TargetInfo.
	TargetInfo::~TargetInfo() {}

	/// getTypeName - Return the user string for the specified integer type enum.
	/// For example, SignedShort -> "short".
	const char *TargetInfo::getTypeName(IntType T) {
	switch (T) {
	default: assert(0 && "not an integer!");
	case SignedShort: return "short";
	case UnsignedShort: return "unsigned short";
	case SignedInt: return "int";
	case UnsignedInt: return "unsigned int";
	case SignedLong: return "long int";
	case UnsignedLong: return "long unsigned int";
	case SignedLongLong: return "long long int";
	case UnsignedLongLong: return "long long unsigned int";
	}
	}

	//===----------------------------------------------------------------------===//


	static void removeGCCRegisterPrefix(const char *&Name) {
	if (Name[0] == '%' \|\| Name[0] == '#')
	Name++;
	}

	/// isValidGCCRegisterName - Returns whether the passed in string
	/// is a valid register name according to GCC. This is used by Sema for
	/// inline asm statements.
	bool TargetInfo::isValidGCCRegisterName(const char *Name) const {
	const char * const *Names;
	unsigned NumNames;

	// Get rid of any register prefix.
	removeGCCRegisterPrefix(Name);


	if (strcmp(Name, "memory") == 0 \|\|
	strcmp(Name, "cc") == 0)
	return true;

	getGCCRegNames(Names, NumNames);

	// If we have a number it maps to an entry in the register name array.
	if (isdigit(Name[0])) {
	char *End;
	int n = (int)strtol(Name, &End, 0);
	if (*End == 0)
	return n >= 0 && (unsigned)n < NumNames;
	}

	// Check register names.
	for (unsigned i = 0; i < NumNames; i++) {
	if (strcmp(Name, Names[i]) == 0)
	return true;
	}

	// Now check aliases.
	const GCCRegAlias *Aliases;
	unsigned NumAliases;

	getGCCRegAliases(Aliases, NumAliases);
	for (unsigned i = 0; i < NumAliases; i++) {
	for (unsigned j = 0 ; j < llvm::array_lengthof(Aliases[i].Aliases); j++) {
	if (!Aliases[i].Aliases[j])
	break;
	if (strcmp(Aliases[i].Aliases[j], Name) == 0)
	return true;
	}
	}

	return false;
	}

	const char TargetInfo::getNormalizedGCCRegisterName(const char Name) const {
	assert(isValidGCCRegisterName(Name) && "Invalid register passed in");

	removeGCCRegisterPrefix(Name);

	const char * const *Names;
	unsigned NumNames;

	getGCCRegNames(Names, NumNames);

	// First, check if we have a number.
	if (isdigit(Name[0])) {
	char *End;
	int n = (int)strtol(Name, &End, 0);
	if (*End == 0) {
	assert(n >= 0 && (unsigned)n < NumNames &&
	"Out of bounds register number!");
	return Names[n];
	}
	}

	// Now check aliases.
	const GCCRegAlias *Aliases;
	unsigned NumAliases;

	getGCCRegAliases(Aliases, NumAliases);
	for (unsigned i = 0; i < NumAliases; i++) {
	for (unsigned j = 0 ; j < llvm::array_lengthof(Aliases[i].Aliases); j++) {
	if (!Aliases[i].Aliases[j])
	break;
	if (strcmp(Aliases[i].Aliases[j], Name) == 0)
	return Aliases[i].Register;
	}
	}

	return Name;
	}

	bool TargetInfo::validateOutputConstraint(ConstraintInfo &Info) const {
	const char *Name = Info.getConstraintStr().c_str();
	// An output constraint must start with '=' or '+'
	if (Name != '=' && Name != '+')
	return false;

	if (*Name == '+')
	Info.setIsReadWrite();

	Name++;
	while (*Name) {
	switch (*Name) {
	default:
	if (!validateAsmConstraint(Name, Info)) {
	// FIXME: We temporarily return false
	// so we can add more constraints as we hit it.
	// Eventually, an unknown constraint should just be treated as 'g'.
	return false;
	}
	case '&': // early clobber.
	break;
	case 'r': // general register.
	Info.setAllowsRegister();
	break;
	case 'm': // memory operand.
	Info.setAllowsMemory();
	break;
	case 'g': // general register, memory operand or immediate integer.
	case 'X': // any operand.
	Info.setAllowsRegister();
	Info.setAllowsMemory();
	break;
	}

	Name++;
	}

	return true;
	}

	bool TargetInfo::resolveSymbolicName(const char *&Name,
	ConstraintInfo *OutputConstraints,
	unsigned NumOutputs,
	unsigned &Index) const {
	assert(*Name == '[' && "Symbolic name did not start with '['");
	Name++;
	const char *Start = Name;
	while (Name && Name != ']')
	Name++;

	if (!*Name) {
	// Missing ']'
	return false;
	}

	std::string SymbolicName(Start, Name - Start);

	for (Index = 0; Index != NumOutputs; ++Index)
	if (SymbolicName == OutputConstraints[Index].getName())
	return true;

	return false;
	}

	bool TargetInfo::validateInputConstraint(ConstraintInfo *OutputConstraints,
	unsigned NumOutputs,
	ConstraintInfo &Info) const {
	const char *Name = Info.ConstraintStr.c_str();

	while (*Name) {
	switch (*Name) {
	default:
	// Check if we have a matching constraint
	if (Name >= '0' && Name <= '9') {
	unsigned i = *Name - '0';

	// Check if matching constraint is out of bounds.
	if (i >= NumOutputs)
	return false;

	// The constraint should have the same info as the respective
	// output constraint.
	Info.setTiedOperand(i, OutputConstraints[i]);
	} else if (!validateAsmConstraint(Name, Info)) {
	// FIXME: This error return is in place temporarily so we can
	// add more constraints as we hit it. Eventually, an unknown
	// constraint should just be treated as 'g'.
	return false;
	}
	break;
	case '[': {
	unsigned Index = 0;
	if (!resolveSymbolicName(Name, OutputConstraints, NumOutputs, Index))
	return false;

	break;
	}
	case '%': // commutative
	// FIXME: Fail if % is used with the last operand.
	break;
	case 'i': // immediate integer.
	case 'n': // immediate integer with a known value.
	break;
	case 'I': // Various constant constraints with target-specific meanings.
	case 'J':
	case 'K':
	case 'L':
	case 'M':
	case 'N':
	case 'O':
	case 'P':
	break;
	case 'r': // general register.
	Info.setAllowsRegister();
	break;
	case 'm': // memory operand.
	Info.setAllowsMemory();
	break;
	case 'g': // general register, memory operand or immediate integer.
	case 'X': // any operand.
	Info.setAllowsRegister();
	Info.setAllowsMemory();
	break;
	}

	Name++;
	}

	return true;
	}