LLVM  3.7.0
ARMBuildAttributes.h
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1 //===-- ARMBuildAttributes.h - ARM Build Attributes -------------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file contains enumerations and support routines for ARM build attributes
11 // as defined in ARM ABI addenda document (ABI release 2.08).
12 //
13 // ELF for the ARM Architecture r2.09 - November 30, 2012
14 //
15 // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044e/IHI0044E_aaelf.pdf
16 //
17 //===----------------------------------------------------------------------===//
18 
19 #ifndef LLVM_SUPPORT_ARMBUILDATTRIBUTES_H
20 #define LLVM_SUPPORT_ARMBUILDATTRIBUTES_H
21 
22 namespace llvm {
23 class StringRef;
24 
25 namespace ARMBuildAttrs {
26 
28  // This is for the .cpu asm attr. It translates into one or more
29  // AttrType (below) entries in the .ARM.attributes section in the ELF.
31 };
32 
33 enum AttrType {
34  // Rest correspond to ELF/.ARM.attributes
35  File = 1,
37  CPU_name = 5,
38  CPU_arch = 6,
42  FP_arch = 10,
43  WMMX_arch = 11,
45  PCS_config = 13,
68  MPextension_use = 42, // recoded from 70 (ABI r2.08)
69  DIV_use = 44,
73 
74  /// Legacy Tags
75  Section = 2, // deprecated (ABI r2.09)
76  Symbol = 3, // deprecated (ABI r2.09)
77  ABI_align8_needed = 24, // renamed to ABI_align_needed (ABI r2.09)
78  ABI_align8_preserved = 25, // renamed to ABI_align_preserved (ABI r2.09)
79  nodefaults = 64, // deprecated (ABI r2.09)
80  T2EE_use = 66, // deprecated (ABI r2.09)
81  MPextension_use_old = 70 // recoded to MPextension_use (ABI r2.08)
82 };
83 
84 StringRef AttrTypeAsString(unsigned Attr, bool HasTagPrefix = true);
85 StringRef AttrTypeAsString(AttrType Attr, bool HasTagPrefix = true);
87 
88 // Magic numbers for .ARM.attributes
89 enum AttrMagic {
91 };
92 
93 // Legal Values for CPU_arch, (=6), uleb128
94 enum CPUArch {
95  Pre_v4 = 0,
96  v4 = 1, // e.g. SA110
97  v4T = 2, // e.g. ARM7TDMI
98  v5T = 3, // e.g. ARM9TDMI
99  v5TE = 4, // e.g. ARM946E_S
100  v5TEJ = 5, // e.g. ARM926EJ_S
101  v6 = 6, // e.g. ARM1136J_S
102  v6KZ = 7, // e.g. ARM1176JZ_S
103  v6T2 = 8, // e.g. ARM1156T2_S
104  v6K = 9, // e.g. ARM1176JZ_S
105  v7 = 10, // e.g. Cortex A8, Cortex M3
106  v6_M = 11, // e.g. Cortex M1
107  v6S_M = 12, // v6_M with the System extensions
108  v7E_M = 13, // v7_M with DSP extensions
109  v8 = 14, // v8,v8.1a AArch32
110 };
111 
112 enum CPUArchProfile { // (=7), uleb128
113  Not_Applicable = 0, // pre v7, or cross-profile code
114  ApplicationProfile = (0x41), // 'A' (e.g. for Cortex A8)
115  RealTimeProfile = (0x52), // 'R' (e.g. for Cortex R4)
116  MicroControllerProfile = (0x4D), // 'M' (e.g. for Cortex M3)
117  SystemProfile = (0x53) // 'S' Application or real-time profile
118 };
119 
120 // The following have a lot of common use cases
121 enum {
123  Allowed = 1,
124 
125  // Tag_ARM_ISA_use (=8), uleb128
126 
127  // Tag_THUMB_ISA_use, (=9), uleb128
128  AllowThumb32 = 2, // 32-bit Thumb (implies 16-bit instructions)
129 
130  // Tag_FP_arch (=10), uleb128 (formerly Tag_VFP_arch = 10)
131  AllowFPv2 = 2, // v2 FP ISA permitted (implies use of the v1 FP ISA)
132  AllowFPv3A = 3, // v3 FP ISA permitted (implies use of the v2 FP ISA)
133  AllowFPv3B = 4, // v3 FP ISA permitted, but only D0-D15, S0-S31
134  AllowFPv4A = 5, // v4 FP ISA permitted (implies use of v3 FP ISA)
135  AllowFPv4B = 6, // v4 FP ISA was permitted, but only D0-D15, S0-S31
136  AllowFPARMv8A = 7, // Use of the ARM v8-A FP ISA was permitted
137  AllowFPARMv8B = 8, // Use of the ARM v8-A FP ISA was permitted, but only
138  // D0-D15, S0-S31
139 
140  // Tag_WMMX_arch, (=11), uleb128
141  AllowWMMXv1 = 1, // The user permitted this entity to use WMMX v1
142  AllowWMMXv2 = 2, // The user permitted this entity to use WMMX v2
143 
144  // Tag_Advanced_SIMD_arch, (=12), uleb128
145  AllowNeon = 1, // SIMDv1 was permitted
146  AllowNeon2 = 2, // SIMDv2 was permitted (Half-precision FP, MAC operations)
147  AllowNeonARMv8 = 3, // ARM v8-A SIMD was permitted
148  AllowNeonARMv8_1a = 4,// ARM v8.1-A SIMD was permitted (RDMA)
149 
150  // Tag_ABI_PCS_R9_use, (=14), uleb128
151  R9IsGPR = 0, // R9 used as v6 (just another callee-saved register)
152  R9IsSB = 1, // R9 used as a global static base rgister
153  R9IsTLSPointer = 2, // R9 used as a thread local storage pointer
154  R9Reserved = 3, // R9 not used by code associated with attributed entity
155 
156  // Tag_ABI_PCS_RW_data, (=15), uleb128
157  AddressRWPCRel = 1, // Address RW static data PC-relative
158  AddressRWSBRel = 2, // Address RW static data SB-relative
159  AddressRWNone = 3, // No RW static data permitted
160 
161  // Tag_ABI_PCS_RO_data, (=14), uleb128
162  AddressROPCRel = 1, // Address RO static data PC-relative
163  AddressRONone = 2, // No RO static data permitted
164 
165  // Tag_ABI_PCS_GOT_use, (=17), uleb128
166  AddressDirect = 1, // Address imported data directly
167  AddressGOT = 2, // Address imported data indirectly (via GOT)
168 
169  // Tag_ABI_PCS_wchar_t, (=18), uleb128
170  WCharProhibited = 0, // wchar_t is not used
171  WCharWidth2Bytes = 2, // sizeof(wchar_t) == 2
172  WCharWidth4Bytes = 4, // sizeof(wchar_t) == 4
173 
174  // Tag_ABI_FP_denormal, (=20), uleb128
177  PreserveFPSign = 2, // sign when flushed-to-zero is preserved
178 
179  // Tag_ABI_FP_number_model, (=23), uleb128
180  AllowRTABI = 2, // numbers, infinities, and one quiet NaN (see [RTABI])
181  AllowIEE754 = 3, // this code to use all the IEEE 754-defined FP encodings
182 
183  // Tag_ABI_enum_size, (=26), uleb128
184  EnumProhibited = 0, // The user prohibited the use of enums when building
185  // this entity.
186  EnumSmallest = 1, // Enum is smallest container big enough to hold all
187  // values.
188  Enum32Bit = 2, // Enum is at least 32 bits.
189  Enum32BitABI = 3, // Every enumeration visible across an ABI-complying
190  // interface contains a value needing 32 bits to encode
191  // it; other enums can be containerized.
192 
193  // Tag_ABI_HardFP_use, (=27), uleb128
194  HardFPImplied = 0, // FP use should be implied by Tag_FP_arch
195  HardFPSinglePrecision = 1, // Single-precision only
196 
197  // Tag_ABI_VFP_args, (=28), uleb128
200 
201  // Tag_FP_HP_extension, (=36), uleb128
202  AllowHPFP = 1, // Allow use of Half Precision FP
203 
204  // Tag_FP_16bit_format, (=38), uleb128
206 
207  // Tag_MPextension_use, (=42), uleb128
208  AllowMP = 1, // Allow use of MP extensions
209 
210  // Tag_DIV_use, (=44), uleb128
211  // Note: AllowDIVExt must be emitted if and only if the permission to use
212  // hardware divide cannot be conveyed using AllowDIVIfExists or DisallowDIV
213  AllowDIVIfExists = 0, // Allow hardware divide if available in arch, or no
214  // info exists.
215  DisallowDIV = 1, // Hardware divide explicitly disallowed.
216  AllowDIVExt = 2, // Allow hardware divide as optional architecture
217  // extension above the base arch specified by
218  // Tag_CPU_arch and Tag_CPU_arch_profile.
219 
220  // Tag_Virtualization_use, (=68), uleb128
221  AllowTZ = 1,
224 };
225 
226 } // namespace ARMBuildAttrs
227 } // namespace llvm
228 
229 #endif
StringRef AttrTypeAsString(unsigned Attr, bool HasTagPrefix=true)
int AttrTypeFromString(StringRef Tag)
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:40