TargetInfo.h source code [clang_source_code/include/clang/Basic/TargetInfo.h]

1	//===--- TargetInfo.h - Expose information about the target ------ C++ --===//
2	//
3	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4	// See https://llvm.org/LICENSE.txt for license information.
5	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6	//
7	//===----------------------------------------------------------------------===//
8	///
9	/// \file
10	/// Defines the clang::TargetInfo interface.
11	///
12	//===----------------------------------------------------------------------===//
13
14	#ifndef LLVM_CLANG_BASIC_TARGETINFO_H
15	#define LLVM_CLANG_BASIC_TARGETINFO_H
16
17	#include "clang/Basic/AddressSpaces.h"
18	#include "clang/Basic/LLVM.h"
19	#include "clang/Basic/Specifiers.h"
20	#include "clang/Basic/TargetCXXABI.h"
21	#include "clang/Basic/TargetOptions.h"
22	#include "llvm/ADT/APInt.h"
23	#include "llvm/ADT/IntrusiveRefCntPtr.h"
24	#include "llvm/ADT/Optional.h"
25	#include "llvm/ADT/SmallSet.h"
26	#include "llvm/ADT/StringMap.h"
27	#include "llvm/ADT/StringRef.h"
28	#include "llvm/ADT/Triple.h"
29	#include "llvm/IR/DataLayout.h"
30	#include "llvm/Support/DataTypes.h"
31	#include "llvm/Support/VersionTuple.h"
32	#include <cassert>
33	#include <string>
34	#include <vector>
35
36	namespace llvm {
37	struct fltSemantics;
38	}
39
40	namespace clang {
41	class DiagnosticsEngine;
42	class LangOptions;
43	class CodeGenOptions;
44	class MacroBuilder;
45	class QualType;
46	class SourceLocation;
47	class SourceManager;
48
49	namespace Builtin { struct Info; }
50
51	/// Fields controlling how types are laid out in memory; these may need to
52	/// be copied for targets like AMDGPU that base their ABIs on an auxiliary
53	/// CPU target.
54	struct TransferrableTargetInfo {
55	unsigned char PointerWidth, PointerAlign;
56	unsigned char BoolWidth, BoolAlign;
57	unsigned char IntWidth, IntAlign;
58	unsigned char HalfWidth, HalfAlign;
59	unsigned char FloatWidth, FloatAlign;
60	unsigned char DoubleWidth, DoubleAlign;
61	unsigned char LongDoubleWidth, LongDoubleAlign, Float128Align;
62	unsigned char LargeArrayMinWidth, LargeArrayAlign;
63	unsigned char LongWidth, LongAlign;
64	unsigned char LongLongWidth, LongLongAlign;
65
66	// Fixed point bit widths
67	unsigned char ShortAccumWidth, ShortAccumAlign;
68	unsigned char AccumWidth, AccumAlign;
69	unsigned char LongAccumWidth, LongAccumAlign;
70	unsigned char ShortFractWidth, ShortFractAlign;
71	unsigned char FractWidth, FractAlign;
72	unsigned char LongFractWidth, LongFractAlign;
73
74	// If true, unsigned fixed point types have the same number of fractional bits
75	// as their signed counterparts, forcing the unsigned types to have one extra
76	// bit of padding. Otherwise, unsigned fixed point types have
77	// one more fractional bit than its corresponding signed type. This is false
78	// by default.
79	bool PaddingOnUnsignedFixedPoint;
80
81	// Fixed point integral and fractional bit sizes
82	// Saturated types share the same integral/fractional bits as their
83	// corresponding unsaturated types.
84	// For simplicity, the fractional bits in a _Fract type will be one less the
85	// width of that _Fract type. This leaves all signed _Fract types having no
86	// padding and unsigned _Fract types will only have 1 bit of padding after the
87	// sign if PaddingOnUnsignedFixedPoint is set.
88	unsigned char ShortAccumScale;
89	unsigned char AccumScale;
90	unsigned char LongAccumScale;
91
92	unsigned char SuitableAlign;
93	unsigned char DefaultAlignForAttributeAligned;
94	unsigned char MinGlobalAlign;
95
96	unsigned short NewAlign;
97	unsigned short MaxVectorAlign;
98	unsigned short MaxTLSAlign;
99
100	const llvm::fltSemantics HalfFormat, FloatFormat, *DoubleFormat,
101	LongDoubleFormat, Float128Format;
102
103	///===---- Target Data Type Query Methods -------------------------------===//
104	enum IntType {
105	NoInt = 0,
106	SignedChar,
107	UnsignedChar,
108	SignedShort,
109	UnsignedShort,
110	SignedInt,
111	UnsignedInt,
112	SignedLong,
113	UnsignedLong,
114	SignedLongLong,
115	UnsignedLongLong
116	};
117
118	enum RealType {
119	NoFloat = 255,
120	Float = 0,
121	Double,
122	LongDouble,
123	Float128
124	};
125	protected:
126	IntType SizeType, IntMaxType, PtrDiffType, IntPtrType, WCharType,
127	WIntType, Char16Type, Char32Type, Int64Type, SigAtomicType,
128	ProcessIDType;
129
130	/// Whether Objective-C's built-in boolean type should be signed char.
131	///
132	/// Otherwise, when this flag is not set, the normal built-in boolean type is
133	/// used.
134	unsigned UseSignedCharForObjCBool : 1;
135
136	/// Control whether the alignment of bit-field types is respected when laying
137	/// out structures. If true, then the alignment of the bit-field type will be
138	/// used to (a) impact the alignment of the containing structure, and (b)
139	/// ensure that the individual bit-field will not straddle an alignment
140	/// boundary.
141	unsigned UseBitFieldTypeAlignment : 1;
142
143	/// Whether zero length bitfields (e.g., int : 0;) force alignment of
144	/// the next bitfield.
145	///
146	/// If the alignment of the zero length bitfield is greater than the member
147	/// that follows it, `bar', `bar' will be aligned as the type of the
148	/// zero-length bitfield.
149	unsigned UseZeroLengthBitfieldAlignment : 1;
150
151	/// Whether explicit bit field alignment attributes are honored.
152	unsigned UseExplicitBitFieldAlignment : 1;
153
154	/// If non-zero, specifies a fixed alignment value for bitfields that follow
155	/// zero length bitfield, regardless of the zero length bitfield type.
156	unsigned ZeroLengthBitfieldBoundary;
157	};
158
159	/// Exposes information about the current target.
160	///
161	class TargetInfo : public virtual TransferrableTargetInfo,
162	public RefCountedBase<TargetInfo> {
163	std::shared_ptr<TargetOptions> TargetOpts;
164	llvm::Triple Triple;
165	protected:
166	// Target values set by the ctor of the actual target implementation. Default
167	// values are specified by the TargetInfo constructor.
168	bool BigEndian;
169	bool TLSSupported;
170	bool VLASupported;
171	bool NoAsmVariants; // True if {\|} are normal characters.
172	bool HasLegalHalfType; // True if the backend supports operations on the half
173	// LLVM IR type.
174	bool HasFloat128;
175	bool HasFloat16;
176
177	unsigned char MaxAtomicPromoteWidth, MaxAtomicInlineWidth;
178	unsigned short SimdDefaultAlign;
179	std::unique_ptr<llvm::DataLayout> DataLayout;
180	const char *MCountName;
181	unsigned char RegParmMax, SSERegParmMax;
182	TargetCXXABI TheCXXABI;
183	const LangASMap *AddrSpaceMap;
184
185	mutable StringRef PlatformName;
186	mutable VersionTuple PlatformMinVersion;
187
188	unsigned HasAlignMac68kSupport : 1;
189	unsigned RealTypeUsesObjCFPRet : 3;
190	unsigned ComplexLongDoubleUsesFP2Ret : 1;
191
192	unsigned HasBuiltinMSVaList : 1;
193
194	unsigned IsRenderScriptTarget : 1;
195
196	// TargetInfo Constructor. Default initializes all fields.
197	TargetInfo(const llvm::Triple &T);
198
199	void resetDataLayout(StringRef DL) {
200	DataLayout.reset(new llvm::DataLayout(DL));
201	}
202
203	public:
204	/// Construct a target for the given options.
205	///
206	/// \param Opts - The options to use to initialize the target. The target may
207	/// modify the options to canonicalize the target feature information to match
208	/// what the backend expects.
209	static TargetInfo *
210	CreateTargetInfo(DiagnosticsEngine &Diags,
211	const std::shared_ptr<TargetOptions> &Opts);
212
213	virtual ~TargetInfo();
214
215	/// Retrieve the target options.
216	TargetOptions &getTargetOpts() const {
217	(0) . __assert_fail ("TargetOpts && \"Missing target options\"", "/home/seafit/code_projects/clang_source/clang/include/clang/Basic/TargetInfo.h", 217, __PRETTY_FUNCTION__))" file_link="../../../../include/assert.h.html#88" macro="true">assert(TargetOpts && "Missing target options");
218	return *TargetOpts;
219	}
220
221	/// The different kinds of __builtin_va_list types defined by
222	/// the target implementation.
223	enum BuiltinVaListKind {
224	/// typedef char* __builtin_va_list;
225	CharPtrBuiltinVaList = 0,
226
227	/// typedef void* __builtin_va_list;
228	VoidPtrBuiltinVaList,
229
230	/// __builtin_va_list as defined by the AArch64 ABI
231	/// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055a/IHI0055A_aapcs64.pdf
232	AArch64ABIBuiltinVaList,
233
234	/// __builtin_va_list as defined by the PNaCl ABI:
235	/// http://www.chromium.org/nativeclient/pnacl/bitcode-abi#TOC-Machine-Types
236	PNaClABIBuiltinVaList,
237
238	/// __builtin_va_list as defined by the Power ABI:
239	/// https://www.power.org
240	/// /resources/downloads/Power-Arch-32-bit-ABI-supp-1.0-Embedded.pdf
241	PowerABIBuiltinVaList,
242
243	/// __builtin_va_list as defined by the x86-64 ABI:
244	/// http://refspecs.linuxbase.org/elf/x86_64-abi-0.21.pdf
245	X86_64ABIBuiltinVaList,
246
247	/// __builtin_va_list as defined by ARM AAPCS ABI
248	/// http://infocenter.arm.com
249	// /help/topic/com.arm.doc.ihi0042d/IHI0042D_aapcs.pdf
250	AAPCSABIBuiltinVaList,
251
252	// typedef struct __va_list_tag
253	// {
254	// long __gpr;
255	// long __fpr;
256	// void *__overflow_arg_area;
257	// void *__reg_save_area;
258	// } va_list[1];
259	SystemZBuiltinVaList
260	};
261
262	protected:
263	/// Specify if mangling based on address space map should be used or
264	/// not for language specific address spaces
265	bool UseAddrSpaceMapMangling;
266
267	public:
268	IntType getSizeType() const { return SizeType; }
269	IntType getSignedSizeType() const {
270	switch (SizeType) {
271	case UnsignedShort:
272	return SignedShort;
273	case UnsignedInt:
274	return SignedInt;
275	case UnsignedLong:
276	return SignedLong;
277	case UnsignedLongLong:
278	return SignedLongLong;
279	default:
280	llvm_unreachable("Invalid SizeType");
281	}
282	}
283	IntType getIntMaxType() const { return IntMaxType; }
284	IntType getUIntMaxType() const {
285	return getCorrespondingUnsignedType(IntMaxType);
286	}
287	IntType getPtrDiffType(unsigned AddrSpace) const {
288	return AddrSpace == 0 ? PtrDiffType : getPtrDiffTypeV(AddrSpace);
289	}
290	IntType getUnsignedPtrDiffType(unsigned AddrSpace) const {
291	return getCorrespondingUnsignedType(getPtrDiffType(AddrSpace));
292	}
293	IntType getIntPtrType() const { return IntPtrType; }
294	IntType getUIntPtrType() const {
295	return getCorrespondingUnsignedType(IntPtrType);
296	}
297	IntType getWCharType() const { return WCharType; }
298	IntType getWIntType() const { return WIntType; }
299	IntType getChar16Type() const { return Char16Type; }
300	IntType getChar32Type() const { return Char32Type; }
301	IntType getInt64Type() const { return Int64Type; }
302	IntType getUInt64Type() const {
303	return getCorrespondingUnsignedType(Int64Type);
304	}
305	IntType getSigAtomicType() const { return SigAtomicType; }
306	IntType getProcessIDType() const { return ProcessIDType; }
307
308	static IntType getCorrespondingUnsignedType(IntType T) {
309	switch (T) {
310	case SignedChar:
311	return UnsignedChar;
312	case SignedShort:
313	return UnsignedShort;
314	case SignedInt:
315	return UnsignedInt;
316	case SignedLong:
317	return UnsignedLong;
318	case SignedLongLong:
319	return UnsignedLongLong;
320	default:
321	llvm_unreachable("Unexpected signed integer type");
322	}
323	}
324
325	/// In the event this target uses the same number of fractional bits for its
326	/// unsigned types as it does with its signed counterparts, there will be
327	/// exactly one bit of padding.
328	/// Return true if unsigned fixed point types have padding for this target.
329	bool doUnsignedFixedPointTypesHavePadding() const {
330	return PaddingOnUnsignedFixedPoint;
331	}
332
333	/// Return the width (in bits) of the specified integer type enum.
334	///
335	/// For example, SignedInt -> getIntWidth().
336	unsigned getTypeWidth(IntType T) const;
337
338	/// Return integer type with specified width.
339	virtual IntType getIntTypeByWidth(unsigned BitWidth, bool IsSigned) const;
340
341	/// Return the smallest integer type with at least the specified width.
342	virtual IntType getLeastIntTypeByWidth(unsigned BitWidth,
343	bool IsSigned) const;
344
345	/// Return floating point type with specified width.
346	RealType getRealTypeByWidth(unsigned BitWidth) const;
347
348	/// Return the alignment (in bits) of the specified integer type enum.
349	///
350	/// For example, SignedInt -> getIntAlign().
351	unsigned getTypeAlign(IntType T) const;
352
353	/// Returns true if the type is signed; false otherwise.
354	static bool isTypeSigned(IntType T);
355
356	/// Return the width of pointers on this target, for the
357	/// specified address space.
358	uint64_t getPointerWidth(unsigned AddrSpace) const {
359	return AddrSpace == 0 ? PointerWidth : getPointerWidthV(AddrSpace);
360	}
361	uint64_t getPointerAlign(unsigned AddrSpace) const {
362	return AddrSpace == 0 ? PointerAlign : getPointerAlignV(AddrSpace);
363	}
364
365	/// Return the maximum width of pointers on this target.
366	virtual uint64_t getMaxPointerWidth() const {
367	return PointerWidth;
368	}
369
370	/// Get integer value for null pointer.
371	/// \param AddrSpace address space of pointee in source language.
372	virtual uint64_t getNullPointerValue(LangAS AddrSpace) const { return 0; }
373
374	/// Return the size of '_Bool' and C++ 'bool' for this target, in bits.
375	unsigned getBoolWidth() const { return BoolWidth; }
376
377	/// Return the alignment of '_Bool' and C++ 'bool' for this target.
378	unsigned getBoolAlign() const { return BoolAlign; }
379
380	unsigned getCharWidth() const { return 8; } // FIXME
381	unsigned getCharAlign() const { return 8; } // FIXME
382
383	/// Return the size of 'signed short' and 'unsigned short' for this
384	/// target, in bits.
385	unsigned getShortWidth() const { return 16; } // FIXME
386
387	/// Return the alignment of 'signed short' and 'unsigned short' for
388	/// this target.
389	unsigned getShortAlign() const { return 16; } // FIXME
390
391	/// getIntWidth/Align - Return the size of 'signed int' and 'unsigned int' for
392	/// this target, in bits.
393	unsigned getIntWidth() const { return IntWidth; }
394	unsigned getIntAlign() const { return IntAlign; }
395
396	/// getLongWidth/Align - Return the size of 'signed long' and 'unsigned long'
397	/// for this target, in bits.
398	unsigned getLongWidth() const { return LongWidth; }
399	unsigned getLongAlign() const { return LongAlign; }
400
401	/// getLongLongWidth/Align - Return the size of 'signed long long' and
402	/// 'unsigned long long' for this target, in bits.
403	unsigned getLongLongWidth() const { return LongLongWidth; }
404	unsigned getLongLongAlign() const { return LongLongAlign; }
405
406	/// getShortAccumWidth/Align - Return the size of 'signed short _Accum' and
407	/// 'unsigned short _Accum' for this target, in bits.
408	unsigned getShortAccumWidth() const { return ShortAccumWidth; }
409	unsigned getShortAccumAlign() const { return ShortAccumAlign; }
410
411	/// getAccumWidth/Align - Return the size of 'signed _Accum' and
412	/// 'unsigned _Accum' for this target, in bits.
413	unsigned getAccumWidth() const { return AccumWidth; }
414	unsigned getAccumAlign() const { return AccumAlign; }
415
416	/// getLongAccumWidth/Align - Return the size of 'signed long _Accum' and
417	/// 'unsigned long _Accum' for this target, in bits.
418	unsigned getLongAccumWidth() const { return LongAccumWidth; }
419	unsigned getLongAccumAlign() const { return LongAccumAlign; }
420
421	/// getShortFractWidth/Align - Return the size of 'signed short _Fract' and
422	/// 'unsigned short _Fract' for this target, in bits.
423	unsigned getShortFractWidth() const { return ShortFractWidth; }
424	unsigned getShortFractAlign() const { return ShortFractAlign; }
425
426	/// getFractWidth/Align - Return the size of 'signed _Fract' and
427	/// 'unsigned _Fract' for this target, in bits.
428	unsigned getFractWidth() const { return FractWidth; }
429	unsigned getFractAlign() const { return FractAlign; }
430
431	/// getLongFractWidth/Align - Return the size of 'signed long _Fract' and
432	/// 'unsigned long _Fract' for this target, in bits.
433	unsigned getLongFractWidth() const { return LongFractWidth; }
434	unsigned getLongFractAlign() const { return LongFractAlign; }
435
436	/// getShortAccumScale/IBits - Return the number of fractional/integral bits
437	/// in a 'signed short _Accum' type.
438	unsigned getShortAccumScale() const { return ShortAccumScale; }
439	unsigned getShortAccumIBits() const {
440	return ShortAccumWidth - ShortAccumScale - 1;
441	}
442
443	/// getAccumScale/IBits - Return the number of fractional/integral bits
444	/// in a 'signed _Accum' type.
445	unsigned getAccumScale() const { return AccumScale; }
446	unsigned getAccumIBits() const { return AccumWidth - AccumScale - 1; }
447
448	/// getLongAccumScale/IBits - Return the number of fractional/integral bits
449	/// in a 'signed long _Accum' type.
450	unsigned getLongAccumScale() const { return LongAccumScale; }
451	unsigned getLongAccumIBits() const {
452	return LongAccumWidth - LongAccumScale - 1;
453	}
454
455	/// getUnsignedShortAccumScale/IBits - Return the number of
456	/// fractional/integral bits in a 'unsigned short _Accum' type.
457	unsigned getUnsignedShortAccumScale() const {
458	return PaddingOnUnsignedFixedPoint ? ShortAccumScale : ShortAccumScale + 1;
459	}
460	unsigned getUnsignedShortAccumIBits() const {
461	return PaddingOnUnsignedFixedPoint
462	? getShortAccumIBits()
463	: ShortAccumWidth - getUnsignedShortAccumScale();
464	}
465
466	/// getUnsignedAccumScale/IBits - Return the number of fractional/integral
467	/// bits in a 'unsigned _Accum' type.
468	unsigned getUnsignedAccumScale() const {
469	return PaddingOnUnsignedFixedPoint ? AccumScale : AccumScale + 1;
470	}
471	unsigned getUnsignedAccumIBits() const {
472	return PaddingOnUnsignedFixedPoint ? getAccumIBits()
473	: AccumWidth - getUnsignedAccumScale();
474	}
475
476	/// getUnsignedLongAccumScale/IBits - Return the number of fractional/integral
477	/// bits in a 'unsigned long _Accum' type.
478	unsigned getUnsignedLongAccumScale() const {
479	return PaddingOnUnsignedFixedPoint ? LongAccumScale : LongAccumScale + 1;
480	}
481	unsigned getUnsignedLongAccumIBits() const {
482	return PaddingOnUnsignedFixedPoint
483	? getLongAccumIBits()
484	: LongAccumWidth - getUnsignedLongAccumScale();
485	}
486
487	/// getShortFractScale - Return the number of fractional bits
488	/// in a 'signed short _Fract' type.
489	unsigned getShortFractScale() const { return ShortFractWidth - 1; }
490
491	/// getFractScale - Return the number of fractional bits
492	/// in a 'signed _Fract' type.
493	unsigned getFractScale() const { return FractWidth - 1; }
494
495	/// getLongFractScale - Return the number of fractional bits
496	/// in a 'signed long _Fract' type.
497	unsigned getLongFractScale() const { return LongFractWidth - 1; }
498
499	/// getUnsignedShortFractScale - Return the number of fractional bits
500	/// in a 'unsigned short _Fract' type.
501	unsigned getUnsignedShortFractScale() const {
502	return PaddingOnUnsignedFixedPoint ? getShortFractScale()
503	: getShortFractScale() + 1;
504	}
505
506	/// getUnsignedFractScale - Return the number of fractional bits
507	/// in a 'unsigned _Fract' type.
508	unsigned getUnsignedFractScale() const {
509	return PaddingOnUnsignedFixedPoint ? getFractScale() : getFractScale() + 1;
510	}
511
512	/// getUnsignedLongFractScale - Return the number of fractional bits
513	/// in a 'unsigned long _Fract' type.
514	unsigned getUnsignedLongFractScale() const {
515	return PaddingOnUnsignedFixedPoint ? getLongFractScale()
516	: getLongFractScale() + 1;
517	}
518
519	/// Determine whether the __int128 type is supported on this target.
520	virtual bool hasInt128Type() const {
521	return (getPointerWidth(0) >= 64) \|\| getTargetOpts().ForceEnableInt128;
522	} // FIXME
523
524	/// Determine whether _Float16 is supported on this target.
525	virtual bool hasLegalHalfType() const { return HasLegalHalfType; }
526
527	/// Determine whether the __float128 type is supported on this target.
528	virtual bool hasFloat128Type() const { return HasFloat128; }
529
530	/// Determine whether the _Float16 type is supported on this target.
531	virtual bool hasFloat16Type() const { return HasFloat16; }
532
533	/// Return the alignment that is suitable for storing any
534	/// object with a fundamental alignment requirement.
535	unsigned getSuitableAlign() const { return SuitableAlign; }
536
537	/// Return the default alignment for __attribute__((aligned)) on
538	/// this target, to be used if no alignment value is specified.
539	unsigned getDefaultAlignForAttributeAligned() const {
540	return DefaultAlignForAttributeAligned;
541	}
542
543	/// getMinGlobalAlign - Return the minimum alignment of a global variable,
544	/// unless its alignment is explicitly reduced via attributes.
545	unsigned getMinGlobalAlign() const { return MinGlobalAlign; }
546
547	/// Return the largest alignment for which a suitably-sized allocation with
548	/// '::operator new(size_t)' is guaranteed to produce a correctly-aligned
549	/// pointer.
550	unsigned getNewAlign() const {
551	return NewAlign ? NewAlign : std::max(LongDoubleAlign, LongLongAlign);
552	}
553
554	/// getWCharWidth/Align - Return the size of 'wchar_t' for this target, in
555	/// bits.
556	unsigned getWCharWidth() const { return getTypeWidth(WCharType); }
557	unsigned getWCharAlign() const { return getTypeAlign(WCharType); }
558
559	/// getChar16Width/Align - Return the size of 'char16_t' for this target, in
560	/// bits.
561	unsigned getChar16Width() const { return getTypeWidth(Char16Type); }
562	unsigned getChar16Align() const { return getTypeAlign(Char16Type); }
563
564	/// getChar32Width/Align - Return the size of 'char32_t' for this target, in
565	/// bits.
566	unsigned getChar32Width() const { return getTypeWidth(Char32Type); }
567	unsigned getChar32Align() const { return getTypeAlign(Char32Type); }
568
569	/// getHalfWidth/Align/Format - Return the size/align/format of 'half'.
570	unsigned getHalfWidth() const { return HalfWidth; }
571	unsigned getHalfAlign() const { return HalfAlign; }
572	const llvm::fltSemantics &getHalfFormat() const { return *HalfFormat; }
573
574	/// getFloatWidth/Align/Format - Return the size/align/format of 'float'.
575	unsigned getFloatWidth() const { return FloatWidth; }
576	unsigned getFloatAlign() const { return FloatAlign; }
577	const llvm::fltSemantics &getFloatFormat() const { return *FloatFormat; }
578
579	/// getDoubleWidth/Align/Format - Return the size/align/format of 'double'.
580	unsigned getDoubleWidth() const { return DoubleWidth; }
581	unsigned getDoubleAlign() const { return DoubleAlign; }
582	const llvm::fltSemantics &getDoubleFormat() const { return *DoubleFormat; }
583
584	/// getLongDoubleWidth/Align/Format - Return the size/align/format of 'long
585	/// double'.
586	unsigned getLongDoubleWidth() const { return LongDoubleWidth; }
587	unsigned getLongDoubleAlign() const { return LongDoubleAlign; }
588	const llvm::fltSemantics &getLongDoubleFormat() const {
589	return *LongDoubleFormat;
590	}
591
592	/// getFloat128Width/Align/Format - Return the size/align/format of
593	/// '__float128'.
594	unsigned getFloat128Width() const { return 128; }
595	unsigned getFloat128Align() const { return Float128Align; }
596	const llvm::fltSemantics &getFloat128Format() const {
597	return *Float128Format;
598	}
599
600	/// Return true if the 'long double' type should be mangled like
601	/// __float128.
602	virtual bool useFloat128ManglingForLongDouble() const { return false; }
603
604	/// Return the value for the C99 FLT_EVAL_METHOD macro.
605	virtual unsigned getFloatEvalMethod() const { return 0; }
606
607	// getLargeArrayMinWidth/Align - Return the minimum array size that is
608	// 'large' and its alignment.
609	unsigned getLargeArrayMinWidth() const { return LargeArrayMinWidth; }
610	unsigned getLargeArrayAlign() const { return LargeArrayAlign; }
611
612	/// Return the maximum width lock-free atomic operation which will
613	/// ever be supported for the given target
614	unsigned getMaxAtomicPromoteWidth() const { return MaxAtomicPromoteWidth; }
615	/// Return the maximum width lock-free atomic operation which can be
616	/// inlined given the supported features of the given target.
617	unsigned getMaxAtomicInlineWidth() const { return MaxAtomicInlineWidth; }
618	/// Set the maximum inline or promote width lock-free atomic operation
619	/// for the given target.
620	virtual void setMaxAtomicWidth() {}
621	/// Returns true if the given target supports lock-free atomic
622	/// operations at the specified width and alignment.
623	virtual bool hasBuiltinAtomic(uint64_t AtomicSizeInBits,
624	uint64_t AlignmentInBits) const {
625	return AtomicSizeInBits <= AlignmentInBits &&
626	AtomicSizeInBits <= getMaxAtomicInlineWidth() &&
627	(AtomicSizeInBits <= getCharWidth() \|\|
628	llvm::isPowerOf2_64(AtomicSizeInBits / getCharWidth()));
629	}
630
631	/// Return the maximum vector alignment supported for the given target.
632	unsigned getMaxVectorAlign() const { return MaxVectorAlign; }
633	/// Return default simd alignment for the given target. Generally, this
634	/// value is type-specific, but this alignment can be used for most of the
635	/// types for the given target.
636	unsigned getSimdDefaultAlign() const { return SimdDefaultAlign; }
637
638	/// Return the size of intmax_t and uintmax_t for this target, in bits.
639	unsigned getIntMaxTWidth() const {
640	return getTypeWidth(IntMaxType);
641	}
642
643	// Return the size of unwind_word for this target.
644	virtual unsigned getUnwindWordWidth() const { return getPointerWidth(0); }
645
646	/// Return the "preferred" register width on this target.
647	virtual unsigned getRegisterWidth() const {
648	// Currently we assume the register width on the target matches the pointer
649	// width, we can introduce a new variable for this if/when some target wants
650	// it.
651	return PointerWidth;
652	}
653
654	/// Returns the name of the mcount instrumentation function.
655	const char *getMCountName() const {
656	return MCountName;
657	}
658
659	/// Check if the Objective-C built-in boolean type should be signed
660	/// char.
661	///
662	/// Otherwise, if this returns false, the normal built-in boolean type
663	/// should also be used for Objective-C.
664	bool useSignedCharForObjCBool() const {
665	return UseSignedCharForObjCBool;
666	}
667	void noSignedCharForObjCBool() {
668	UseSignedCharForObjCBool = false;
669	}
670
671	/// Check whether the alignment of bit-field types is respected
672	/// when laying out structures.
673	bool useBitFieldTypeAlignment() const {
674	return UseBitFieldTypeAlignment;
675	}
676
677	/// Check whether zero length bitfields should force alignment of
678	/// the next member.
679	bool useZeroLengthBitfieldAlignment() const {
680	return UseZeroLengthBitfieldAlignment;
681	}
682
683	/// Get the fixed alignment value in bits for a member that follows
684	/// a zero length bitfield.
685	unsigned getZeroLengthBitfieldBoundary() const {
686	return ZeroLengthBitfieldBoundary;
687	}
688
689	/// Check whether explicit bitfield alignment attributes should be
690	// honored, as in "__attribute__((aligned(2))) int b : 1;".
691	bool useExplicitBitFieldAlignment() const {
692	return UseExplicitBitFieldAlignment;
693	}
694
695	/// Check whether this target support '\#pragma options align=mac68k'.
696	bool hasAlignMac68kSupport() const {
697	return HasAlignMac68kSupport;
698	}
699
700	/// Return the user string for the specified integer type enum.
701	///
702	/// For example, SignedShort -> "short".
703	static const char *getTypeName(IntType T);
704
705	/// Return the constant suffix for the specified integer type enum.
706	///
707	/// For example, SignedLong -> "L".
708	const char *getTypeConstantSuffix(IntType T) const;
709
710	/// Return the printf format modifier for the specified
711	/// integer type enum.
712	///
713	/// For example, SignedLong -> "l".
714	static const char *getTypeFormatModifier(IntType T);
715
716	/// Check whether the given real type should use the "fpret" flavor of
717	/// Objective-C message passing on this target.
718	bool useObjCFPRetForRealType(RealType T) const {
719	return RealTypeUsesObjCFPRet & (1 << T);
720	}
721
722	/// Check whether _Complex long double should use the "fp2ret" flavor
723	/// of Objective-C message passing on this target.
724	bool useObjCFP2RetForComplexLongDouble() const {
725	return ComplexLongDoubleUsesFP2Ret;
726	}
727
728	/// Check whether llvm intrinsics such as llvm.convert.to.fp16 should be used
729	/// to convert to and from __fp16.
730	/// FIXME: This function should be removed once all targets stop using the
731	/// conversion intrinsics.
732	virtual bool useFP16ConversionIntrinsics() const {
733	return true;
734	}
735
736	/// Specify if mangling based on address space map should be used or
737	/// not for language specific address spaces
738	bool useAddressSpaceMapMangling() const {
739	return UseAddrSpaceMapMangling;
740	}
741
742	///===---- Other target property query methods --------------------------===//
743
744	/// Appends the target-specific \#define values for this
745	/// target set to the specified buffer.
746	virtual void getTargetDefines(const LangOptions &Opts,
747	MacroBuilder &Builder) const = 0;
748
749
750	/// Return information about target-specific builtins for
751	/// the current primary target, and info about which builtins are non-portable
752	/// across the current set of primary and secondary targets.
753	virtual ArrayRef<Builtin::Info> getTargetBuiltins() const = 0;
754
755	/// The __builtin_clz* and __builtin_ctz* built-in
756	/// functions are specified to have undefined results for zero inputs, but
757	/// on targets that support these operations in a way that provides
758	/// well-defined results for zero without loss of performance, it is a good
759	/// idea to avoid optimizing based on that undef behavior.
760	virtual bool isCLZForZeroUndef() const { return true; }
761
762	/// Returns the kind of __builtin_va_list type that should be used
763	/// with this target.
764	virtual BuiltinVaListKind getBuiltinVaListKind() const = 0;
765
766	/// Returns whether or not type \c __builtin_ms_va_list type is
767	/// available on this target.
768	bool hasBuiltinMSVaList() const { return HasBuiltinMSVaList; }
769
770	/// Returns true for RenderScript.
771	bool isRenderScriptTarget() const { return IsRenderScriptTarget; }
772
773	/// Returns whether the passed in string is a valid clobber in an
774	/// inline asm statement.
775	///
776	/// This is used by Sema.
777	bool isValidClobber(StringRef Name) const;
778
779	/// Returns whether the passed in string is a valid register name
780	/// according to GCC.
781	///
782	/// This is used by Sema for inline asm statements.
783	virtual bool isValidGCCRegisterName(StringRef Name) const;
784
785	/// Returns the "normalized" GCC register name.
786	///
787	/// ReturnCannonical true will return the register name without any additions
788	/// such as "{}" or "%" in it's canonical form, for example:
789	/// ReturnCanonical = true and Name = "rax", will return "ax".
790	StringRef getNormalizedGCCRegisterName(StringRef Name,
791	bool ReturnCanonical = false) const;
792
793	/// Extracts a register from the passed constraint (if it is a
794	/// single-register constraint) and the asm label expression related to a
795	/// variable in the input or output list of an inline asm statement.
796	///
797	/// This function is used by Sema in order to diagnose conflicts between
798	/// the clobber list and the input/output lists.
799	virtual StringRef getConstraintRegister(StringRef Constraint,
800	StringRef Expression) const {
801	return "";
802	}
803
804	struct ConstraintInfo {
805	enum {
806	CI_None = 0x00,
807	CI_AllowsMemory = 0x01,
808	CI_AllowsRegister = 0x02,
809	CI_ReadWrite = 0x04, // "+r" output constraint (read and write).
810	CI_HasMatchingInput = 0x08, // This output operand has a matching input.
811	CI_ImmediateConstant = 0x10, // This operand must be an immediate constant
812	CI_EarlyClobber = 0x20, // "&" output constraint (early clobber).
813	};
814	unsigned Flags;
815	int TiedOperand;
816	struct {
817	int Min;
818	int Max;
819	bool isConstrained;
820	} ImmRange;
821	llvm::SmallSet<int, 4> ImmSet;
822
823	std::string ConstraintStr; // constraint: "=rm"
824	std::string Name; // Operand name: [foo] with no []'s.
825	public:
826	ConstraintInfo(StringRef ConstraintStr, StringRef Name)
827	: Flags(0), TiedOperand(-1), ConstraintStr(ConstraintStr.str()),
828	Name(Name.str()) {
829	ImmRange.Min = ImmRange.Max = 0;
830	ImmRange.isConstrained = false;
831	}
832
833	const std::string &getConstraintStr() const { return ConstraintStr; }
834	const std::string &getName() const { return Name; }
835	bool isReadWrite() const { return (Flags & CI_ReadWrite) != 0; }
836	bool earlyClobber() { return (Flags & CI_EarlyClobber) != 0; }
837	bool allowsRegister() const { return (Flags & CI_AllowsRegister) != 0; }
838	bool allowsMemory() const { return (Flags & CI_AllowsMemory) != 0; }
839
840	/// Return true if this output operand has a matching
841	/// (tied) input operand.
842	bool hasMatchingInput() const { return (Flags & CI_HasMatchingInput) != 0; }
843
844	/// Return true if this input operand is a matching
845	/// constraint that ties it to an output operand.
846	///
847	/// If this returns true then getTiedOperand will indicate which output
848	/// operand this is tied to.
849	bool hasTiedOperand() const { return TiedOperand != -1; }
850	unsigned getTiedOperand() const {
851	(0) . __assert_fail ("hasTiedOperand() && \"Has no tied operand!\"", "/home/seafit/code_projects/clang_source/clang/include/clang/Basic/TargetInfo.h", 851, __PRETTY_FUNCTION__))" file_link="../../../../include/assert.h.html#88" macro="true">assert(hasTiedOperand() && "Has no tied operand!");
852	return (unsigned)TiedOperand;
853	}
854
855	bool requiresImmediateConstant() const {
856	return (Flags & CI_ImmediateConstant) != 0;
857	}
858	bool isValidAsmImmediate(const llvm::APInt &Value) const {
859	if (!ImmSet.empty())
860	return Value.isSignedIntN(32) &&
861	ImmSet.count(Value.getZExtValue()) != 0;
862	return !ImmRange.isConstrained \|\|
863	(Value.sge(ImmRange.Min) && Value.sle(ImmRange.Max));
864	}
865
866	void setIsReadWrite() { Flags \|= CI_ReadWrite; }
867	void setEarlyClobber() { Flags \|= CI_EarlyClobber; }
868	void setAllowsMemory() { Flags \|= CI_AllowsMemory; }
869	void setAllowsRegister() { Flags \|= CI_AllowsRegister; }
870	void setHasMatchingInput() { Flags \|= CI_HasMatchingInput; }
871	void setRequiresImmediate(int Min, int Max) {
872	Flags \|= CI_ImmediateConstant;
873	ImmRange.Min = Min;
874	ImmRange.Max = Max;
875	ImmRange.isConstrained = true;
876	}
877	void setRequiresImmediate(llvm::ArrayRef<int> Exacts) {
878	Flags \|= CI_ImmediateConstant;
879	for (int Exact : Exacts)
880	ImmSet.insert(Exact);
881	}
882	void setRequiresImmediate(int Exact) {
883	Flags \|= CI_ImmediateConstant;
884	ImmSet.insert(Exact);
885	}
886	void setRequiresImmediate() {
887	Flags \|= CI_ImmediateConstant;
888	}
889
890	/// Indicate that this is an input operand that is tied to
891	/// the specified output operand.
892	///
893	/// Copy over the various constraint information from the output.
894	void setTiedOperand(unsigned N, ConstraintInfo &Output) {
895	Output.setHasMatchingInput();
896	Flags = Output.Flags;
897	TiedOperand = N;
898	// Don't copy Name or constraint string.
899	}
900	};
901
902	/// Validate register name used for global register variables.
903	///
904	/// This function returns true if the register passed in RegName can be used
905	/// for global register variables on this target. In addition, it returns
906	/// true in HasSizeMismatch if the size of the register doesn't match the
907	/// variable size passed in RegSize.
908	virtual bool validateGlobalRegisterVariable(StringRef RegName,
909	unsigned RegSize,
910	bool &HasSizeMismatch) const {
911	HasSizeMismatch = false;
912	return true;
913	}
914
915	// validateOutputConstraint, validateInputConstraint - Checks that
916	// a constraint is valid and provides information about it.
917	// FIXME: These should return a real error instead of just true/false.
918	bool validateOutputConstraint(ConstraintInfo &Info) const;
919	bool validateInputConstraint(MutableArrayRef<ConstraintInfo> OutputConstraints,
920	ConstraintInfo &info) const;
921
922	virtual bool validateOutputSize(StringRef /Constraint/,
923	unsigned /Size/) const {
924	return true;
925	}
926
927	virtual bool validateInputSize(StringRef /Constraint/,
928	unsigned /Size/) const {
929	return true;
930	}
931	virtual bool
932	validateConstraintModifier(StringRef /Constraint/,
933	char /Modifier/,
934	unsigned /Size/,
935	std::string &/SuggestedModifier/) const {
936	return true;
937	}
938	virtual bool
939	validateAsmConstraint(const char *&Name,
940	TargetInfo::ConstraintInfo &info) const = 0;
941
942	bool resolveSymbolicName(const char *&Name,
943	ArrayRef<ConstraintInfo> OutputConstraints,
944	unsigned &Index) const;
945
946	// Constraint parm will be left pointing at the last character of
947	// the constraint. In practice, it won't be changed unless the
948	// constraint is longer than one character.
949	virtual std::string convertConstraint(const char *&Constraint) const {
950	// 'p' defaults to 'r', but can be overridden by targets.
951	if (*Constraint == 'p')
952	return std::string("r");
953	return std::string(1, *Constraint);
954	}
955
956	/// Returns a string of target-specific clobbers, in LLVM format.
957	virtual const char *getClobbers() const = 0;
958
959	/// Returns true if NaN encoding is IEEE 754-2008.
960	/// Only MIPS allows a different encoding.
961	virtual bool isNan2008() const {
962	return true;
963	}
964
965	/// Returns the target triple of the primary target.
966	const llvm::Triple &getTriple() const {
967	return Triple;
968	}
969
970	const llvm::DataLayout &getDataLayout() const {
971	(0) . __assert_fail ("DataLayout && \"Uninitialized DataLayout!\"", "/home/seafit/code_projects/clang_source/clang/include/clang/Basic/TargetInfo.h", 971, __PRETTY_FUNCTION__))" file_link="../../../../include/assert.h.html#88" macro="true">assert(DataLayout && "Uninitialized DataLayout!");
972	return *DataLayout;
973	}
974
975	struct GCCRegAlias {
976	const char * const Aliases[5];
977	const char * const Register;
978	};
979
980	struct AddlRegName {
981	const char * const Names[5];
982	const unsigned RegNum;
983	};
984
985	/// Does this target support "protected" visibility?
986	///
987	/// Any target which dynamic libraries will naturally support
988	/// something like "default" (meaning that the symbol is visible
989	/// outside this shared object) and "hidden" (meaning that it isn't)
990	/// visibilities, but "protected" is really an ELF-specific concept
991	/// with weird semantics designed around the convenience of dynamic
992	/// linker implementations. Which is not to suggest that there's
993	/// consistent target-independent semantics for "default" visibility
994	/// either; the entire thing is pretty badly mangled.
995	virtual bool hasProtectedVisibility() const { return true; }
996
997	/// An optional hook that targets can implement to perform semantic
998	/// checking on attribute((section("foo"))) specifiers.
999	///
1000	/// In this case, "foo" is passed in to be checked. If the section
1001	/// specifier is invalid, the backend should return a non-empty string
1002	/// that indicates the problem.
1003	///
1004	/// This hook is a simple quality of implementation feature to catch errors
1005	/// and give good diagnostics in cases when the assembler or code generator
1006	/// would otherwise reject the section specifier.
1007	///
1008	virtual std::string isValidSectionSpecifier(StringRef SR) const {
1009	return "";
1010	}
1011
1012	/// Set forced language options.
1013	///
1014	/// Apply changes to the target information with respect to certain
1015	/// language options which change the target configuration and adjust
1016	/// the language based on the target options where applicable.
1017	virtual void adjust(LangOptions &Opts);
1018
1019	/// Adjust target options based on codegen options.
1020	virtual void adjustTargetOptions(const CodeGenOptions &CGOpts,
1021	TargetOptions &TargetOpts) const {}
1022
1023	/// Initialize the map with the default set of target features for the
1024	/// CPU this should include all legal feature strings on the target.
1025	///
1026	/// \return False on error (invalid features).
1027	virtual bool initFeatureMap(llvm::StringMap<bool> &Features,
1028	DiagnosticsEngine &Diags, StringRef CPU,
1029	const std::vector<std::string> &FeatureVec) const;
1030
1031	/// Get the ABI currently in use.
1032	virtual StringRef getABI() const { return StringRef(); }
1033
1034	/// Get the C++ ABI currently in use.
1035	TargetCXXABI getCXXABI() const {
1036	return TheCXXABI;
1037	}
1038
1039	/// Target the specified CPU.
1040	///
1041	/// \return False on error (invalid CPU name).
1042	virtual bool setCPU(const std::string &Name) {
1043	return false;
1044	}
1045
1046	/// Fill a SmallVectorImpl with the valid values to setCPU.
1047	virtual void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const {}
1048
1049	/// brief Determine whether this TargetInfo supports the given CPU name.
1050	virtual bool isValidCPUName(StringRef Name) const {
1051	return true;
1052	}
1053
1054	/// Use the specified ABI.
1055	///
1056	/// \return False on error (invalid ABI name).
1057	virtual bool setABI(const std::string &Name) {
1058	return false;
1059	}
1060
1061	/// Use the specified unit for FP math.
1062	///
1063	/// \return False on error (invalid unit name).
1064	virtual bool setFPMath(StringRef Name) {
1065	return false;
1066	}
1067
1068	/// Enable or disable a specific target feature;
1069	/// the feature name must be valid.
1070	virtual void setFeatureEnabled(llvm::StringMap<bool> &Features,
1071	StringRef Name,
1072	bool Enabled) const {
1073	Features[Name] = Enabled;
1074	}
1075
1076	/// Determine whether this TargetInfo supports the given feature.
1077	virtual bool isValidFeatureName(StringRef Feature) const {
1078	return true;
1079	}
1080
1081	/// Perform initialization based on the user configured
1082	/// set of features (e.g., +sse4).
1083	///
1084	/// The list is guaranteed to have at most one entry per feature.
1085	///
1086	/// The target may modify the features list, to change which options are
1087	/// passed onwards to the backend.
1088	/// FIXME: This part should be fixed so that we can change handleTargetFeatures
1089	/// to merely a TargetInfo initialization routine.
1090	///
1091	/// \return False on error.
1092	virtual bool handleTargetFeatures(std::vector<std::string> &Features,
1093	DiagnosticsEngine &Diags) {
1094	return true;
1095	}
1096
1097	/// Determine whether the given target has the given feature.
1098	virtual bool hasFeature(StringRef Feature) const {
1099	return false;
1100	}
1101
1102	/// Identify whether this target supports multiversioning of functions,
1103	/// which requires support for cpu_supports and cpu_is functionality.
1104	bool supportsMultiVersioning() const {
1105	return getTriple().getArch() == llvm::Triple::x86 \|\|
1106	getTriple().getArch() == llvm::Triple::x86_64;
1107	}
1108
1109	/// Identify whether this target supports IFuncs.
1110	bool supportsIFunc() const { return getTriple().isOSBinFormatELF(); }
1111
1112	// Validate the contents of the __builtin_cpu_supports(const char*)
1113	// argument.
1114	virtual bool validateCpuSupports(StringRef Name) const { return false; }
1115
1116	// Return the target-specific priority for features/cpus/vendors so
1117	// that they can be properly sorted for checking.
1118	virtual unsigned multiVersionSortPriority(StringRef Name) const {
1119	return 0;
1120	}
1121
1122	// Validate the contents of the __builtin_cpu_is(const char*)
1123	// argument.
1124	virtual bool validateCpuIs(StringRef Name) const { return false; }
1125
1126	// Validate a cpu_dispatch/cpu_specific CPU option, which is a different list
1127	// from cpu_is, since it checks via features rather than CPUs directly.
1128	virtual bool validateCPUSpecificCPUDispatch(StringRef Name) const {
1129	return false;
1130	}
1131
1132	// Get the character to be added for mangling purposes for cpu_specific.
1133	virtual char CPUSpecificManglingCharacter(StringRef Name) const {
1134	llvm_unreachable(
1135	"cpu_specific Multiversioning not implemented on this target");
1136	}
1137
1138	// Get a list of the features that make up the CPU option for
1139	// cpu_specific/cpu_dispatch so that it can be passed to llvm as optimization
1140	// options.
1141	virtual void getCPUSpecificCPUDispatchFeatures(
1142	StringRef Name, llvm::SmallVectorImpl<StringRef> &Features) const {
1143	llvm_unreachable(
1144	"cpu_specific Multiversioning not implemented on this target");
1145	}
1146
1147	// Returns maximal number of args passed in registers.
1148	unsigned getRegParmMax() const {
1149	(0) . __assert_fail ("RegParmMax < 7 && \"RegParmMax value is larger than AST can handle\"", "/home/seafit/code_projects/clang_source/clang/include/clang/Basic/TargetInfo.h", 1149, __PRETTY_FUNCTION__))" file_link="../../../../include/assert.h.html#88" macro="true">assert(RegParmMax < 7 && "RegParmMax value is larger than AST can handle");
1150	return RegParmMax;
1151	}
1152
1153	/// Whether the target supports thread-local storage.
1154	bool isTLSSupported() const {
1155	return TLSSupported;
1156	}
1157
1158	/// Return the maximum alignment (in bits) of a TLS variable
1159	///
1160	/// Gets the maximum alignment (in bits) of a TLS variable on this target.
1161	/// Returns zero if there is no such constraint.
1162	unsigned short getMaxTLSAlign() const {
1163	return MaxTLSAlign;
1164	}
1165
1166	/// Whether target supports variable-length arrays.
1167	bool isVLASupported() const { return VLASupported; }
1168
1169	/// Whether the target supports SEH __try.
1170	bool isSEHTrySupported() const {
1171	return getTriple().isOSWindows() &&
1172	(getTriple().getArch() == llvm::Triple::x86 \|\|
1173	getTriple().getArch() == llvm::Triple::x86_64 \|\|
1174	getTriple().getArch() == llvm::Triple::aarch64);
1175	}
1176
1177	/// Return true if {\|} are normal characters in the asm string.
1178	///
1179	/// If this returns false (the default), then {abc\|xyz} is syntax
1180	/// that says that when compiling for asm variant #0, "abc" should be
1181	/// generated, but when compiling for asm variant #1, "xyz" should be
1182	/// generated.
1183	bool hasNoAsmVariants() const {
1184	return NoAsmVariants;
1185	}
1186
1187	/// Return the register number that __builtin_eh_return_regno would
1188	/// return with the specified argument.
1189	/// This corresponds with TargetLowering's getExceptionPointerRegister
1190	/// and getExceptionSelectorRegister in the backend.
1191	virtual int getEHDataRegisterNumber(unsigned RegNo) const {
1192	return -1;
1193	}
1194
1195	/// Return the section to use for C++ static initialization functions.
1196	virtual const char *getStaticInitSectionSpecifier() const {
1197	return nullptr;
1198	}
1199
1200	const LangASMap &getAddressSpaceMap() const { return *AddrSpaceMap; }
1201
1202	/// Map from the address space field in builtin description strings to the
1203	/// language address space.
1204	virtual LangAS getOpenCLBuiltinAddressSpace(unsigned AS) const {
1205	return getLangASFromTargetAS(AS);
1206	}
1207
1208	/// Map from the address space field in builtin description strings to the
1209	/// language address space.
1210	virtual LangAS getCUDABuiltinAddressSpace(unsigned AS) const {
1211	return getLangASFromTargetAS(AS);
1212	}
1213
1214	/// Return an AST address space which can be used opportunistically
1215	/// for constant global memory. It must be possible to convert pointers into
1216	/// this address space to LangAS::Default. If no such address space exists,
1217	/// this may return None, and such optimizations will be disabled.
1218	virtual llvm::Optional<LangAS> getConstantAddressSpace() const {
1219	return LangAS::Default;
1220	}
1221
1222	/// Retrieve the name of the platform as it is used in the
1223	/// availability attribute.
1224	StringRef getPlatformName() const { return PlatformName; }
1225
1226	/// Retrieve the minimum desired version of the platform, to
1227	/// which the program should be compiled.
1228	VersionTuple getPlatformMinVersion() const { return PlatformMinVersion; }
1229
1230	bool isBigEndian() const { return BigEndian; }
1231	bool isLittleEndian() const { return !BigEndian; }
1232
1233	enum CallingConvMethodType {
1234	CCMT_Unknown,
1235	CCMT_Member,
1236	CCMT_NonMember
1237	};
1238
1239	/// Gets the default calling convention for the given target and
1240	/// declaration context.
1241	virtual CallingConv getDefaultCallingConv(CallingConvMethodType MT) const {
1242	// Not all targets will specify an explicit calling convention that we can
1243	// express. This will always do the right thing, even though it's not
1244	// an explicit calling convention.
1245	return CC_C;
1246	}
1247
1248	enum CallingConvCheckResult {
1249	CCCR_OK,
1250	CCCR_Warning,
1251	CCCR_Ignore,
1252	};
1253
1254	/// Determines whether a given calling convention is valid for the
1255	/// target. A calling convention can either be accepted, produce a warning
1256	/// and be substituted with the default calling convention, or (someday)
1257	/// produce an error (such as using thiscall on a non-instance function).
1258	virtual CallingConvCheckResult checkCallingConvention(CallingConv CC) const {
1259	switch (CC) {
1260	default:
1261	return CCCR_Warning;
1262	case CC_C:
1263	return CCCR_OK;
1264	}
1265	}
1266
1267	enum CallingConvKind {
1268	CCK_Default,
1269	CCK_ClangABI4OrPS4,
1270	CCK_MicrosoftWin64
1271	};
1272
1273	virtual CallingConvKind getCallingConvKind(bool ClangABICompat4) const;
1274
1275	/// Controls if __builtin_longjmp / __builtin_setjmp can be lowered to
1276	/// llvm.eh.sjlj.longjmp / llvm.eh.sjlj.setjmp.
1277	virtual bool hasSjLjLowering() const {
1278	return false;
1279	}
1280
1281	/// Check if the target supports CFProtection branch.
1282	virtual bool
1283	checkCFProtectionBranchSupported(DiagnosticsEngine &Diags) const;
1284
1285	/// Check if the target supports CFProtection branch.
1286	virtual bool
1287	checkCFProtectionReturnSupported(DiagnosticsEngine &Diags) const;
1288
1289	/// Whether target allows to overalign ABI-specified preferred alignment
1290	virtual bool allowsLargerPreferedTypeAlignment() const { return true; }
1291
1292	/// Set supported OpenCL extensions and optional core features.
1293	virtual void setSupportedOpenCLOpts() {}
1294
1295	/// Set supported OpenCL extensions as written on command line
1296	virtual void setOpenCLExtensionOpts() {
1297	for (const auto &Ext : getTargetOpts().OpenCLExtensionsAsWritten) {
1298	getTargetOpts().SupportedOpenCLOptions.support(Ext);
1299	}
1300	}
1301
1302	/// Get supported OpenCL extensions and optional core features.
1303	OpenCLOptions &getSupportedOpenCLOpts() {
1304	return getTargetOpts().SupportedOpenCLOptions;
1305	}
1306
1307	/// Get const supported OpenCL extensions and optional core features.
1308	const OpenCLOptions &getSupportedOpenCLOpts() const {
1309	return getTargetOpts().SupportedOpenCLOptions;
1310	}
1311
1312	enum OpenCLTypeKind {
1313	OCLTK_Default,
1314	OCLTK_ClkEvent,
1315	OCLTK_Event,
1316	OCLTK_Image,
1317	OCLTK_Pipe,
1318	OCLTK_Queue,
1319	OCLTK_ReserveID,
1320	OCLTK_Sampler,
1321	};
1322
1323	/// Get address space for OpenCL type.
1324	virtual LangAS getOpenCLTypeAddrSpace(OpenCLTypeKind TK) const;
1325
1326	/// \returns Target specific vtbl ptr address space.
1327	virtual unsigned getVtblPtrAddressSpace() const {
1328	return 0;
1329	}
1330
1331	/// \returns If a target requires an address within a target specific address
1332	/// space \p AddressSpace to be converted in order to be used, then return the
1333	/// corresponding target specific DWARF address space.
1334	///
1335	/// \returns Otherwise return None and no conversion will be emitted in the
1336	/// DWARF.
1337	virtual Optional<unsigned> getDWARFAddressSpace(unsigned AddressSpace) const {
1338	return None;
1339	}
1340
1341	/// \returns The version of the SDK which was used during the compilation if
1342	/// one was specified, or an empty version otherwise.
1343	const llvm::VersionTuple &getSDKVersion() const {
1344	return getTargetOpts().SDKVersion;
1345	}
1346
1347	/// Check the target is valid after it is fully initialized.
1348	virtual bool validateTarget(DiagnosticsEngine &Diags) const {
1349	return true;
1350	}
1351
1352	virtual void setAuxTarget(const TargetInfo *Aux) {}
1353
1354	protected:
1355	/// Copy type and layout related info.
1356	void copyAuxTarget(const TargetInfo *Aux);
1357	virtual uint64_t getPointerWidthV(unsigned AddrSpace) const {
1358	return PointerWidth;
1359	}
1360	virtual uint64_t getPointerAlignV(unsigned AddrSpace) const {
1361	return PointerAlign;
1362	}
1363	virtual enum IntType getPtrDiffTypeV(unsigned AddrSpace) const {
1364	return PtrDiffType;
1365	}
1366	virtual ArrayRef<const char *> getGCCRegNames() const = 0;
1367	virtual ArrayRef<GCCRegAlias> getGCCRegAliases() const = 0;
1368	virtual ArrayRef<AddlRegName> getGCCAddlRegNames() const {
1369	return None;
1370	}
1371
1372	private:
1373	// Assert the values for the fractional and integral bits for each fixed point
1374	// type follow the restrictions given in clause 6.2.6.3 of N1169.
1375	void CheckFixedPointBits() const;
1376	};
1377
1378	} // end namespace clang
1379
1380	#endif
1381