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//===--- TargetInfo.h - Expose information about the target -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the TargetInfo interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_BASIC_TARGETINFO_H
#define LLVM_CLANG_BASIC_TARGETINFO_H
// FIXME: Daniel isn't smart enough to use a prototype for this.
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/Triple.h"
#include "llvm/System/DataTypes.h"
#include <cassert>
#include <vector>
#include <string>
namespace llvm {
struct fltSemantics;
class StringRef;
}
namespace clang {
class Diagnostic;
class LangOptions;
class MacroBuilder;
class SourceLocation;
class SourceManager;
class TargetOptions;
namespace Builtin { struct Info; }
/// TargetInfo - This class exposes information about the current target.
///
class TargetInfo {
llvm::Triple Triple;
protected:
// Target values set by the ctor of the actual target implementation. Default
// values are specified by the TargetInfo constructor.
bool TLSSupported;
bool NoAsmVariants; // True if {|} are normal characters.
unsigned char PointerWidth, PointerAlign;
unsigned char IntWidth, IntAlign;
unsigned char FloatWidth, FloatAlign;
unsigned char DoubleWidth, DoubleAlign;
unsigned char LongDoubleWidth, LongDoubleAlign;
unsigned char LongWidth, LongAlign;
unsigned char LongLongWidth, LongLongAlign;
const char *DescriptionString;
const char *UserLabelPrefix;
const llvm::fltSemantics *FloatFormat, *DoubleFormat, *LongDoubleFormat;
unsigned char RegParmMax, SSERegParmMax;
// TargetInfo Constructor. Default initializes all fields.
TargetInfo(const std::string &T);
public:
/// CreateTargetInfo - Construct a target for the given options.
///
/// \param Opts - The options to use to initialize the target. The target may
/// modify the options to canonicalize the target feature information to match
/// what the backend expects.
static TargetInfo* CreateTargetInfo(Diagnostic &Diags, TargetOptions &Opts);
virtual ~TargetInfo();
///===---- Target Data Type Query Methods -------------------------------===//
enum IntType {
NoInt = 0,
SignedShort,
UnsignedShort,
SignedInt,
UnsignedInt,
SignedLong,
UnsignedLong,
SignedLongLong,
UnsignedLongLong
};
protected:
IntType SizeType, IntMaxType, UIntMaxType, PtrDiffType, IntPtrType, WCharType,
WIntType, Char16Type, Char32Type, Int64Type, SigAtomicType;
/// Control whether the alignment of bit-field types is respected when laying
/// out structures. If true, then the alignment of the bit-field type will be
/// used to (a) impact the alignment of the containing structure, and (b)
/// ensure that the individual bit-field will not straddle an alignment
/// boundary.
unsigned UseBitFieldTypeAlignment : 1;
public:
IntType getSizeType() const { return SizeType; }
IntType getIntMaxType() const { return IntMaxType; }
IntType getUIntMaxType() const { return UIntMaxType; }
IntType getPtrDiffType(unsigned AddrSpace) const {
return AddrSpace == 0 ? PtrDiffType : getPtrDiffTypeV(AddrSpace);
}
IntType getIntPtrType() const { return IntPtrType; }
IntType getWCharType() const { return WCharType; }
IntType getWIntType() const { return WIntType; }
IntType getChar16Type() const { return Char16Type; }
IntType getChar32Type() const { return Char32Type; }
IntType getInt64Type() const { return Int64Type; }
IntType getSigAtomicType() const { return SigAtomicType; }
/// getTypeWidth - Return the width (in bits) of the specified integer type
/// enum. For example, SignedInt -> getIntWidth().
unsigned getTypeWidth(IntType T) const;
/// getTypeAlign - Return the alignment (in bits) of the specified integer
/// type enum. For example, SignedInt -> getIntAlign().
unsigned getTypeAlign(IntType T) const;
/// isTypeSigned - Return whether an integer types is signed. Returns true if
/// the type is signed; false otherwise.
bool isTypeSigned(IntType T) const;
/// getPointerWidth - Return the width of pointers on this target, for the
/// specified address space.
uint64_t getPointerWidth(unsigned AddrSpace) const {
return AddrSpace == 0 ? PointerWidth : getPointerWidthV(AddrSpace);
}
uint64_t getPointerAlign(unsigned AddrSpace) const {
return AddrSpace == 0 ? PointerAlign : getPointerAlignV(AddrSpace);
}
/// getBoolWidth/Align - Return the size of '_Bool' and C++ 'bool' for this
/// target, in bits.
unsigned getBoolWidth(bool isWide = false) const { return 8; } // FIXME
unsigned getBoolAlign(bool isWide = false) const { return 8; } // FIXME
unsigned getCharWidth() const { return 8; } // FIXME
unsigned getCharAlign() const { return 8; } // FIXME
/// getShortWidth/Align - Return the size of 'signed short' and
/// 'unsigned short' for this target, in bits.
unsigned getShortWidth() const { return 16; } // FIXME
unsigned getShortAlign() const { return 16; } // FIXME
/// getIntWidth/Align - Return the size of 'signed int' and 'unsigned int' for
/// this target, in bits.
unsigned getIntWidth() const { return IntWidth; }
unsigned getIntAlign() const { return IntAlign; }
/// getLongWidth/Align - Return the size of 'signed long' and 'unsigned long'
/// for this target, in bits.
unsigned getLongWidth() const { return LongWidth; }
unsigned getLongAlign() const { return LongAlign; }
/// getLongLongWidth/Align - Return the size of 'signed long long' and
/// 'unsigned long long' for this target, in bits.
unsigned getLongLongWidth() const { return LongLongWidth; }
unsigned getLongLongAlign() const { return LongLongAlign; }
/// getWCharWidth/Align - Return the size of 'wchar_t' for this target, in
/// bits.
unsigned getWCharWidth() const { return getTypeWidth(WCharType); }
unsigned getWCharAlign() const { return getTypeAlign(WCharType); }
/// getChar16Width/Align - Return the size of 'char16_t' for this target, in
/// bits.
unsigned getChar16Width() const { return getTypeWidth(Char16Type); }
unsigned getChar16Align() const { return getTypeAlign(Char16Type); }
/// getChar32Width/Align - Return the size of 'char32_t' for this target, in
/// bits.
unsigned getChar32Width() const { return getTypeWidth(Char32Type); }
unsigned getChar32Align() const { return getTypeAlign(Char32Type); }
/// getFloatWidth/Align/Format - Return the size/align/format of 'float'.
unsigned getFloatWidth() const { return FloatWidth; }
unsigned getFloatAlign() const { return FloatAlign; }
const llvm::fltSemantics &getFloatFormat() const { return *FloatFormat; }
/// getDoubleWidth/Align/Format - Return the size/align/format of 'double'.
unsigned getDoubleWidth() const { return DoubleWidth; }
unsigned getDoubleAlign() const { return DoubleAlign; }
const llvm::fltSemantics &getDoubleFormat() const { return *DoubleFormat; }
/// getLongDoubleWidth/Align/Format - Return the size/align/format of 'long
/// double'.
unsigned getLongDoubleWidth() const { return LongDoubleWidth; }
unsigned getLongDoubleAlign() const { return LongDoubleAlign; }
const llvm::fltSemantics &getLongDoubleFormat() const {
return *LongDoubleFormat;
}
/// getIntMaxTWidth - Return the size of intmax_t and uintmax_t for this
/// target, in bits.
unsigned getIntMaxTWidth() const {
return getTypeWidth(IntMaxType);
}
/// getUserLabelPrefix - This returns the default value of the
/// __USER_LABEL_PREFIX__ macro, which is the prefix given to user symbols by
/// default. On most platforms this is "_", but it is "" on some, and "." on
/// others.
const char *getUserLabelPrefix() const {
return UserLabelPrefix;
}
bool useBitFieldTypeAlignment() const {
return UseBitFieldTypeAlignment;
}
/// getTypeName - Return the user string for the specified integer type enum.
/// For example, SignedShort -> "short".
static const char *getTypeName(IntType T);
/// getTypeConstantSuffix - Return the constant suffix for the specified
/// integer type enum. For example, SignedLong -> "L".
static const char *getTypeConstantSuffix(IntType T);
///===---- Other target property query methods --------------------------===//
/// getTargetDefines - Appends the target-specific #define values for this
/// target set to the specified buffer.
virtual void getTargetDefines(const LangOptions &Opts,
MacroBuilder &Builder) const = 0;
/// getTargetBuiltins - Return information about target-specific builtins for
/// the current primary target, and info about which builtins are non-portable
/// across the current set of primary and secondary targets.
virtual void getTargetBuiltins(const Builtin::Info *&Records,
unsigned &NumRecords) const = 0;
/// getVAListDeclaration - Return the declaration to use for
/// __builtin_va_list, which is target-specific.
virtual const char *getVAListDeclaration() const = 0;
/// 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 isValidGCCRegisterName(llvm::StringRef Name) const;
// getNormalizedGCCRegisterName - Returns the "normalized" GCC register name.
// For example, on x86 it will return "ax" when "eax" is passed in.
llvm::StringRef getNormalizedGCCRegisterName(llvm::StringRef Name) const;
struct ConstraintInfo {
enum {
CI_None = 0x00,
CI_AllowsMemory = 0x01,
CI_AllowsRegister = 0x02,
CI_ReadWrite = 0x04, // "+r" output constraint (read and write).
CI_HasMatchingInput = 0x08 // This output operand has a matching input.
};
unsigned Flags;
int TiedOperand;
std::string ConstraintStr; // constraint: "=rm"
std::string Name; // Operand name: [foo] with no []'s.
public:
ConstraintInfo(llvm::StringRef ConstraintStr, llvm::StringRef Name)
: Flags(0), TiedOperand(-1), ConstraintStr(ConstraintStr.str()),
Name(Name.str()) {}
const std::string &getConstraintStr() const { return ConstraintStr; }
const std::string &getName() const { return Name; }
bool isReadWrite() const { return (Flags & CI_ReadWrite) != 0; }
bool allowsRegister() const { return (Flags & CI_AllowsRegister) != 0; }
bool allowsMemory() const { return (Flags & CI_AllowsMemory) != 0; }
/// hasMatchingInput - Return true if this output operand has a matching
/// (tied) input operand.
bool hasMatchingInput() const { return (Flags & CI_HasMatchingInput) != 0; }
/// hasTiedOperand() - Return true if this input operand is a matching
/// constraint that ties it to an output operand. If this returns true,
/// then getTiedOperand will indicate which output operand this is tied to.
bool hasTiedOperand() const { return TiedOperand != -1; }
unsigned getTiedOperand() const {
assert(hasTiedOperand() && "Has no tied operand!");
return (unsigned)TiedOperand;
}
void setIsReadWrite() { Flags |= CI_ReadWrite; }
void setAllowsMemory() { Flags |= CI_AllowsMemory; }
void setAllowsRegister() { Flags |= CI_AllowsRegister; }
void setHasMatchingInput() { Flags |= CI_HasMatchingInput; }
/// setTiedOperand - Indicate that this is an input operand that is tied to
/// the specified output operand. Copy over the various constraint
/// information from the output.
void setTiedOperand(unsigned N, ConstraintInfo &Output) {
Output.setHasMatchingInput();
Flags = Output.Flags;
TiedOperand = N;
// Don't copy Name or constraint string.
}
};
// validateOutputConstraint, validateInputConstraint - Checks that
// a constraint is valid and provides information about it.
// FIXME: These should return a real error instead of just true/false.
bool validateOutputConstraint(ConstraintInfo &Info) const;
bool validateInputConstraint(ConstraintInfo *OutputConstraints,
unsigned NumOutputs,
ConstraintInfo &info) const;
bool resolveSymbolicName(const char *&Name,
ConstraintInfo *OutputConstraints,
unsigned NumOutputs, unsigned &Index) const;
virtual std::string convertConstraint(const char Constraint) const {
return std::string(1, Constraint);
}
// Returns a string of target-specific clobbers, in LLVM format.
virtual const char *getClobbers() const = 0;
/// getTriple - Return the target triple of the primary target.
const llvm::Triple &getTriple() const {
return Triple;
}
const char *getTargetDescription() const {
return DescriptionString;
}
struct GCCRegAlias {
const char * const Aliases[5];
const char * const Register;
};
virtual bool useGlobalsForAutomaticVariables() const { return false; }
/// getCFStringSection - Return the section to use for CFString
/// literals, or 0 if no special section is used.
virtual const char *getCFStringSection() const {
return "__DATA,__cfstring";
}
/// getNSStringSection - Return the section to use for NSString
/// literals, or 0 if no special section is used.
virtual const char *getNSStringSection() const {
return "__OBJC,__cstring_object,regular,no_dead_strip";
}
/// getNSStringNonFragileABISection - Return the section to use for
/// NSString literals, or 0 if no special section is used (NonFragile ABI).
virtual const char *getNSStringNonFragileABISection() const {
return "__DATA, __objc_stringobj, regular, no_dead_strip";
}
/// isValidSectionSpecifier - This is an optional hook that targets can
/// implement to perform semantic checking on attribute((section("foo")))
/// specifiers. In this case, "foo" is passed in to be checked. If the
/// section specifier is invalid, the backend should return a non-empty string
/// that indicates the problem.
///
/// This hook is a simple quality of implementation feature to catch errors
/// and give good diagnostics in cases when the assembler or code generator
/// would otherwise reject the section specifier.
///
virtual std::string isValidSectionSpecifier(llvm::StringRef SR) const {
return "";
}
/// setForcedLangOptions - Set forced language options.
/// Apply changes to the target information with respect to certain
/// language options which change the target configuration.
virtual void setForcedLangOptions(LangOptions &Opts);
/// getDefaultFeatures - Get the default set of target features for
/// the \args CPU; this should include all legal feature strings on
/// the target.
virtual void getDefaultFeatures(const std::string &CPU,
llvm::StringMap<bool> &Features) const {
}
/// getABI - Get the ABI in use.
virtual const char *getABI() const {
return "";
}
/// setCPU - Target the specific CPU.
///
/// \return - False on error (invalid CPU name).
//
// FIXME: Remove this.
virtual bool setCPU(const std::string &Name) {
return true;
}
/// setABI - Use the specific ABI.
///
/// \return - False on error (invalid ABI name).
virtual bool setABI(const std::string &Name) {
return false;
}
/// setFeatureEnabled - Enable or disable a specific target feature,
/// the feature name must be valid.
///
/// \return - False on error (invalid feature name).
virtual bool setFeatureEnabled(llvm::StringMap<bool> &Features,
const std::string &Name,
bool Enabled) const {
return false;
}
/// HandleTargetOptions - Perform initialization based on the user configured
/// set of features (e.g., +sse4). The list is guaranteed to have at most one
/// entry per feature.
///
/// The target may modify the features list, to change which options are
/// passed onwards to the backend.
virtual void HandleTargetFeatures(std::vector<std::string> &Features) {
}
// getRegParmMax - Returns maximal number of args passed in registers.
unsigned getRegParmMax() const {
return RegParmMax;
}
/// isTLSSupported - Whether the target supports thread-local storage.
bool isTLSSupported() const {
return TLSSupported;
}
/// hasNoAsmVariants - Return true if {|} are normal characters in the
/// asm string. If this returns false (the default), then {abc|xyz} is syntax
/// that says that when compiling for asm variant #0, "abc" should be
/// generated, but when compiling for asm variant #1, "xyz" should be
/// generated.
bool hasNoAsmVariants() const {
return NoAsmVariants;
}
/// getEHDataRegisterNumber - Return the register number that
/// __builtin_eh_return_regno would return with the specified argument.
virtual int getEHDataRegisterNumber(unsigned RegNo) const {
return -1;
}
protected:
virtual uint64_t getPointerWidthV(unsigned AddrSpace) const {
return PointerWidth;
}
virtual uint64_t getPointerAlignV(unsigned AddrSpace) const {
return PointerAlign;
}
virtual enum IntType getPtrDiffTypeV(unsigned AddrSpace) const {
return PtrDiffType;
}
virtual void getGCCRegNames(const char * const *&Names,
unsigned &NumNames) const = 0;
virtual void getGCCRegAliases(const GCCRegAlias *&Aliases,
unsigned &NumAliases) const = 0;
virtual bool validateAsmConstraint(const char *&Name,
TargetInfo::ConstraintInfo &info) const= 0;
};
} // end namespace clang
#endif
|