/Users/buildslave/jenkins/sharedspace/clang-stage2-coverage-R@2/llvm/lib/MC/MCSectionMachO.cpp
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1 | | //===- lib/MC/MCSectionMachO.cpp - MachO Code Section Representation ------===// |
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 | | #include "llvm/MC/MCSectionMachO.h" |
11 | | #include "llvm/MC/MCContext.h" |
12 | | #include "llvm/Support/raw_ostream.h" |
13 | | #include <cctype> |
14 | | using namespace llvm; |
15 | | |
16 | | /// SectionTypeDescriptors - These are strings that describe the various section |
17 | | /// types. This *must* be kept in order with and stay synchronized with the |
18 | | /// section type list. |
19 | | static constexpr struct { |
20 | | StringLiteral AssemblerName, EnumName; |
21 | | } SectionTypeDescriptors[MachO::LAST_KNOWN_SECTION_TYPE + 1] = { |
22 | | {StringLiteral("regular"), StringLiteral("S_REGULAR")}, // 0x00 |
23 | | {StringLiteral(""), StringLiteral("S_ZEROFILL")}, // 0x01 |
24 | | {StringLiteral("cstring_literals"), |
25 | | StringLiteral("S_CSTRING_LITERALS")}, // 0x02 |
26 | | {StringLiteral("4byte_literals"), |
27 | | StringLiteral("S_4BYTE_LITERALS")}, // 0x03 |
28 | | {StringLiteral("8byte_literals"), |
29 | | StringLiteral("S_8BYTE_LITERALS")}, // 0x04 |
30 | | {StringLiteral("literal_pointers"), |
31 | | StringLiteral("S_LITERAL_POINTERS")}, // 0x05 |
32 | | {StringLiteral("non_lazy_symbol_pointers"), |
33 | | StringLiteral("S_NON_LAZY_SYMBOL_POINTERS")}, // 0x06 |
34 | | {StringLiteral("lazy_symbol_pointers"), |
35 | | StringLiteral("S_LAZY_SYMBOL_POINTERS")}, // 0x07 |
36 | | {StringLiteral("symbol_stubs"), StringLiteral("S_SYMBOL_STUBS")}, // 0x08 |
37 | | {StringLiteral("mod_init_funcs"), |
38 | | StringLiteral("S_MOD_INIT_FUNC_POINTERS")}, // 0x09 |
39 | | {StringLiteral("mod_term_funcs"), |
40 | | StringLiteral("S_MOD_TERM_FUNC_POINTERS")}, // 0x0A |
41 | | {StringLiteral("coalesced"), StringLiteral("S_COALESCED")}, // 0x0B |
42 | | {StringLiteral("") /*FIXME??*/, StringLiteral("S_GB_ZEROFILL")}, // 0x0C |
43 | | {StringLiteral("interposing"), StringLiteral("S_INTERPOSING")}, // 0x0D |
44 | | {StringLiteral("16byte_literals"), |
45 | | StringLiteral("S_16BYTE_LITERALS")}, // 0x0E |
46 | | {StringLiteral("") /*FIXME??*/, StringLiteral("S_DTRACE_DOF")}, // 0x0F |
47 | | {StringLiteral("") /*FIXME??*/, |
48 | | StringLiteral("S_LAZY_DYLIB_SYMBOL_POINTERS")}, // 0x10 |
49 | | {StringLiteral("thread_local_regular"), |
50 | | StringLiteral("S_THREAD_LOCAL_REGULAR")}, // 0x11 |
51 | | {StringLiteral("thread_local_zerofill"), |
52 | | StringLiteral("S_THREAD_LOCAL_ZEROFILL")}, // 0x12 |
53 | | {StringLiteral("thread_local_variables"), |
54 | | StringLiteral("S_THREAD_LOCAL_VARIABLES")}, // 0x13 |
55 | | {StringLiteral("thread_local_variable_pointers"), |
56 | | StringLiteral("S_THREAD_LOCAL_VARIABLE_POINTERS")}, // 0x14 |
57 | | {StringLiteral("thread_local_init_function_pointers"), |
58 | | StringLiteral("S_THREAD_LOCAL_INIT_FUNCTION_POINTERS")}, // 0x15 |
59 | | }; |
60 | | |
61 | | /// SectionAttrDescriptors - This is an array of descriptors for section |
62 | | /// attributes. Unlike the SectionTypeDescriptors, this is not directly indexed |
63 | | /// by attribute, instead it is searched. |
64 | | static constexpr struct { |
65 | | unsigned AttrFlag; |
66 | | StringLiteral AssemblerName, EnumName; |
67 | | } SectionAttrDescriptors[] = { |
68 | | #define ENTRY(ASMNAME, ENUM) \ |
69 | | { MachO::ENUM, StringLiteral(ASMNAME), StringLiteral(#ENUM) }, |
70 | | ENTRY("pure_instructions", S_ATTR_PURE_INSTRUCTIONS) |
71 | | ENTRY("no_toc", S_ATTR_NO_TOC) |
72 | | ENTRY("strip_static_syms", S_ATTR_STRIP_STATIC_SYMS) |
73 | | ENTRY("no_dead_strip", S_ATTR_NO_DEAD_STRIP) |
74 | | ENTRY("live_support", S_ATTR_LIVE_SUPPORT) |
75 | | ENTRY("self_modifying_code", S_ATTR_SELF_MODIFYING_CODE) |
76 | | ENTRY("debug", S_ATTR_DEBUG) |
77 | | ENTRY("" /*FIXME*/, S_ATTR_SOME_INSTRUCTIONS) |
78 | | ENTRY("" /*FIXME*/, S_ATTR_EXT_RELOC) |
79 | | ENTRY("" /*FIXME*/, S_ATTR_LOC_RELOC) |
80 | | #undef ENTRY |
81 | | { 0, StringLiteral("none"), StringLiteral("") }, // used if section has no attributes but has a stub size |
82 | | }; |
83 | | |
84 | | MCSectionMachO::MCSectionMachO(StringRef Segment, StringRef Section, |
85 | | unsigned TAA, unsigned reserved2, SectionKind K, |
86 | | MCSymbol *Begin) |
87 | | : MCSection(SV_MachO, K, Begin), TypeAndAttributes(TAA), |
88 | 970k | Reserved2(reserved2) { |
89 | 970k | assert(Segment.size() <= 16 && Section.size() <= 16 && |
90 | 970k | "Segment or section string too long"); |
91 | 16.4M | for (unsigned i = 0; i != 1616.4M ; ++i15.5M ) { |
92 | 15.5M | if (i < Segment.size()) |
93 | 6.65M | SegmentName[i] = Segment[i]; |
94 | 15.5M | else |
95 | 8.86M | SegmentName[i] = 0; |
96 | 15.5M | |
97 | 15.5M | if (i < Section.size()) |
98 | 12.2M | SectionName[i] = Section[i]; |
99 | 15.5M | else |
100 | 3.25M | SectionName[i] = 0; |
101 | 15.5M | } |
102 | 970k | } |
103 | | |
104 | | void MCSectionMachO::PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T, |
105 | | raw_ostream &OS, |
106 | 6.74k | const MCExpr *Subsection) const { |
107 | 6.74k | OS << "\t.section\t" << getSegmentName() << ',' << getSectionName(); |
108 | 6.74k | |
109 | 6.74k | // Get the section type and attributes. |
110 | 6.74k | unsigned TAA = getTypeAndAttributes(); |
111 | 6.74k | if (TAA == 06.74k ) { |
112 | 648 | OS << '\n'; |
113 | 648 | return; |
114 | 648 | } |
115 | 6.10k | |
116 | 6.10k | MachO::SectionType SectionType = getType(); |
117 | 6.10k | assert(SectionType <= MachO::LAST_KNOWN_SECTION_TYPE && |
118 | 6.10k | "Invalid SectionType specified!"); |
119 | 6.10k | |
120 | 6.10k | if (!SectionTypeDescriptors[SectionType].AssemblerName.empty()6.10k ) { |
121 | 6.10k | OS << ','; |
122 | 6.10k | OS << SectionTypeDescriptors[SectionType].AssemblerName; |
123 | 6.10k | } else { |
124 | 1 | // If we have no name for the attribute, stop here. |
125 | 1 | OS << '\n'; |
126 | 1 | return; |
127 | 1 | } |
128 | 6.10k | |
129 | 6.10k | // If we don't have any attributes, we're done. |
130 | 6.10k | unsigned SectionAttrs = TAA & MachO::SECTION_ATTRIBUTES; |
131 | 6.10k | if (SectionAttrs == 06.10k ) { |
132 | 1.02k | // If we have a S_SYMBOL_STUBS size specified, print it along with 'none' as |
133 | 1.02k | // the attribute specifier. |
134 | 1.02k | if (Reserved2 != 0) |
135 | 0 | OS << ",none," << Reserved2; |
136 | 1.02k | OS << '\n'; |
137 | 1.02k | return; |
138 | 1.02k | } |
139 | 5.07k | |
140 | 5.07k | // Check each attribute to see if we have it. |
141 | 5.07k | char Separator = ','; |
142 | 5.07k | for (unsigned i = 0; |
143 | 16.6k | SectionAttrs != 0 && 16.6k SectionAttrDescriptors[i].AttrFlag11.5k ; |
144 | 11.5k | ++i11.5k ) { |
145 | 11.5k | // Check to see if we have this attribute. |
146 | 11.5k | if ((SectionAttrDescriptors[i].AttrFlag & SectionAttrs) == 0) |
147 | 6.49k | continue; |
148 | 5.07k | |
149 | 5.07k | // Yep, clear it and print it. |
150 | 5.07k | SectionAttrs &= ~SectionAttrDescriptors[i].AttrFlag; |
151 | 5.07k | |
152 | 5.07k | OS << Separator; |
153 | 5.07k | if (!SectionAttrDescriptors[i].AssemblerName.empty()) |
154 | 5.07k | OS << SectionAttrDescriptors[i].AssemblerName; |
155 | 5.07k | else |
156 | 0 | OS << "<<" << SectionAttrDescriptors[i].EnumName << ">>"; |
157 | 11.5k | Separator = '+'; |
158 | 11.5k | } |
159 | 5.07k | |
160 | 5.07k | assert(SectionAttrs == 0 && "Unknown section attributes!"); |
161 | 5.07k | |
162 | 5.07k | // If we have a S_SYMBOL_STUBS size specified, print it. |
163 | 5.07k | if (Reserved2 != 0) |
164 | 157 | OS << ',' << Reserved2; |
165 | 6.74k | OS << '\n'; |
166 | 6.74k | } |
167 | | |
168 | 1.13k | bool MCSectionMachO::UseCodeAlign() const { |
169 | 1.13k | return hasAttribute(MachO::S_ATTR_PURE_INSTRUCTIONS); |
170 | 1.13k | } |
171 | | |
172 | 739k | bool MCSectionMachO::isVirtualSection() const { |
173 | 739k | return (getType() == MachO::S_ZEROFILL || |
174 | 693k | getType() == MachO::S_GB_ZEROFILL || |
175 | 693k | getType() == MachO::S_THREAD_LOCAL_ZEROFILL); |
176 | 739k | } |
177 | | |
178 | | /// ParseSectionSpecifier - Parse the section specifier indicated by "Spec". |
179 | | /// This is a string that can appear after a .section directive in a mach-o |
180 | | /// flavored .s file. If successful, this fills in the specified Out |
181 | | /// parameters and returns an empty string. When an invalid section |
182 | | /// specifier is present, this returns a string indicating the problem. |
183 | | std::string MCSectionMachO::ParseSectionSpecifier(StringRef Spec, // In. |
184 | | StringRef &Segment, // Out. |
185 | | StringRef &Section, // Out. |
186 | | unsigned &TAA, // Out. |
187 | | bool &TAAParsed, // Out. |
188 | 4.50k | unsigned &StubSize) { // Out. |
189 | 4.50k | TAAParsed = false; |
190 | 4.50k | |
191 | 4.50k | SmallVector<StringRef, 5> SplitSpec; |
192 | 4.50k | Spec.split(SplitSpec, ','); |
193 | 4.50k | // Remove leading and trailing whitespace. |
194 | 22.5k | auto GetEmptyOrTrim = [&SplitSpec](size_t Idx) -> StringRef { |
195 | 22.5k | return SplitSpec.size() > Idx ? SplitSpec[Idx].trim()13.5k : StringRef()9.02k ; |
196 | 22.5k | }; |
197 | 4.50k | Segment = GetEmptyOrTrim(0); |
198 | 4.50k | Section = GetEmptyOrTrim(1); |
199 | 4.50k | StringRef SectionType = GetEmptyOrTrim(2); |
200 | 4.50k | StringRef Attrs = GetEmptyOrTrim(3); |
201 | 4.50k | StringRef StubSizeStr = GetEmptyOrTrim(4); |
202 | 4.50k | |
203 | 4.50k | // Verify that the segment is present and not too long. |
204 | 4.50k | if (Segment.empty() || 4.50k Segment.size() > 164.50k ) |
205 | 0 | return "mach-o section specifier requires a segment whose length is " |
206 | 0 | "between 1 and 16 characters"; |
207 | 4.50k | |
208 | 4.50k | // Verify that the section is present and not too long. |
209 | 4.50k | if (4.50k Section.empty()4.50k ) |
210 | 4 | return "mach-o section specifier requires a segment and section " |
211 | 4 | "separated by a comma"; |
212 | 4.50k | |
213 | 4.50k | if (4.50k Section.size() > 164.50k ) |
214 | 0 | return "mach-o section specifier requires a section whose length is " |
215 | 0 | "between 1 and 16 characters"; |
216 | 4.50k | |
217 | 4.50k | // If there is no comma after the section, we're done. |
218 | 4.50k | TAA = 0; |
219 | 4.50k | StubSize = 0; |
220 | 4.50k | if (SectionType.empty()) |
221 | 1.34k | return ""; |
222 | 3.15k | |
223 | 3.15k | // Figure out which section type it is. |
224 | 3.15k | auto TypeDescriptor = std::find_if( |
225 | 3.15k | std::begin(SectionTypeDescriptors), std::end(SectionTypeDescriptors), |
226 | 9.44k | [&](decltype(*SectionTypeDescriptors) &Descriptor) { |
227 | 9.44k | return SectionType == Descriptor.AssemblerName; |
228 | 9.44k | }); |
229 | 3.15k | |
230 | 3.15k | // If we didn't find the section type, reject it. |
231 | 3.15k | if (TypeDescriptor == std::end(SectionTypeDescriptors)) |
232 | 0 | return "mach-o section specifier uses an unknown section type"; |
233 | 3.15k | |
234 | 3.15k | // Remember the TypeID. |
235 | 3.15k | TAA = TypeDescriptor - std::begin(SectionTypeDescriptors); |
236 | 3.15k | TAAParsed = true; |
237 | 3.15k | |
238 | 3.15k | // If we have no comma after the section type, there are no attributes. |
239 | 3.15k | if (Attrs.empty()3.15k ) { |
240 | 1.82k | // S_SYMBOL_STUBS always require a symbol stub size specifier. |
241 | 1.82k | if (TAA == MachO::S_SYMBOL_STUBS) |
242 | 0 | return "mach-o section specifier of type 'symbol_stubs' requires a size " |
243 | 0 | "specifier"; |
244 | 1.82k | return ""; |
245 | 1.82k | } |
246 | 1.32k | |
247 | 1.32k | // The attribute list is a '+' separated list of attributes. |
248 | 1.32k | SmallVector<StringRef, 1> SectionAttrs; |
249 | 1.32k | Attrs.split(SectionAttrs, '+', /*MaxSplit=*/-1, /*KeepEmpty=*/false); |
250 | 1.32k | |
251 | 1.33k | for (StringRef &SectionAttr : SectionAttrs) { |
252 | 1.33k | auto AttrDescriptorI = std::find_if( |
253 | 1.33k | std::begin(SectionAttrDescriptors), std::end(SectionAttrDescriptors), |
254 | 5.11k | [&](decltype(*SectionAttrDescriptors) &Descriptor) { |
255 | 5.11k | return SectionAttr.trim() == Descriptor.AssemblerName; |
256 | 5.11k | }); |
257 | 1.33k | if (AttrDescriptorI == std::end(SectionAttrDescriptors)) |
258 | 0 | return "mach-o section specifier has invalid attribute"; |
259 | 1.33k | |
260 | 1.33k | TAA |= AttrDescriptorI->AttrFlag; |
261 | 1.33k | } |
262 | 1.32k | |
263 | 1.32k | // Okay, we've parsed the section attributes, see if we have a stub size spec. |
264 | 1.32k | if (1.32k StubSizeStr.empty()1.32k ) { |
265 | 1.32k | // S_SYMBOL_STUBS always require a symbol stub size specifier. |
266 | 1.32k | if (TAA == MachO::S_SYMBOL_STUBS) |
267 | 0 | return "mach-o section specifier of type 'symbol_stubs' requires a size " |
268 | 0 | "specifier"; |
269 | 1.32k | return ""; |
270 | 1.32k | } |
271 | 7 | |
272 | 7 | // If we have a stub size spec, we must have a sectiontype of S_SYMBOL_STUBS. |
273 | 7 | if (7 (TAA & MachO::SECTION_TYPE) != MachO::S_SYMBOL_STUBS7 ) |
274 | 0 | return "mach-o section specifier cannot have a stub size specified because " |
275 | 0 | "it does not have type 'symbol_stubs'"; |
276 | 7 | |
277 | 7 | // Convert the stub size from a string to an integer. |
278 | 7 | if (7 StubSizeStr.getAsInteger(0, StubSize)7 ) |
279 | 0 | return "mach-o section specifier has a malformed stub size"; |
280 | 7 | |
281 | 7 | return ""; |
282 | 7 | } |