Bug Summary

File:include/llvm/ADT/SmallBitVector.h
Warning:line 120, column 3
Potential memory leak

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name DwarfExpression.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-9/lib/clang/9.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-9~svn362543/build-llvm/lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-9~svn362543/build-llvm/include -I /build/llvm-toolchain-snapshot-9~svn362543/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/include/clang/9.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-9/lib/clang/9.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-9~svn362543/build-llvm/lib/CodeGen/AsmPrinter -fdebug-prefix-map=/build/llvm-toolchain-snapshot-9~svn362543=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2019-06-05-060531-1271-1 -x c++ /build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp -faddrsig

/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp

→
1//===- llvm/CodeGen/DwarfExpression.cpp - Dwarf Debug Framework -----------===//
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// This file contains support for writing dwarf debug info into asm files.
10//
11//===----------------------------------------------------------------------===//
12
13#include "DwarfExpression.h"
14#include "DwarfCompileUnit.h"
15#include "llvm/ADT/APInt.h"
16#include "llvm/ADT/SmallBitVector.h"
17#include "llvm/BinaryFormat/Dwarf.h"
18#include "llvm/CodeGen/TargetRegisterInfo.h"
19#include "llvm/IR/DebugInfoMetadata.h"
20#include "llvm/Support/ErrorHandling.h"
21#include <algorithm>
22#include <cassert>
23#include <cstdint>
24
25using namespace llvm;
26
27void DwarfExpression::emitConstu(uint64_t Value) {
28 if (Value < 32)
29 emitOp(dwarf::DW_OP_lit0 + Value);
30 else if (Value == std::numeric_limits<uint64_t>::max()) {
31 // Only do this for 64-bit values as the DWARF expression stack uses
32 // target-address-size values.
33 emitOp(dwarf::DW_OP_lit0);
34 emitOp(dwarf::DW_OP_not);
35 } else {
36 emitOp(dwarf::DW_OP_constu);
37 emitUnsigned(Value);
38 }
39}
40
41void DwarfExpression::addReg(int DwarfReg, const char *Comment) {
42 assert(DwarfReg >= 0 && "invalid negative dwarf register number")((DwarfReg >= 0 && "invalid negative dwarf register number"
) ? static_cast<void> (0) : __assert_fail ("DwarfReg >= 0 && \"invalid negative dwarf register number\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 42, __PRETTY_FUNCTION__));
43 assert((isUnknownLocation() || isRegisterLocation()) &&(((isUnknownLocation() || isRegisterLocation()) && "location description already locked down"
) ? static_cast<void> (0) : __assert_fail ("(isUnknownLocation() || isRegisterLocation()) && \"location description already locked down\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 44, __PRETTY_FUNCTION__))
44 "location description already locked down")(((isUnknownLocation() || isRegisterLocation()) && "location description already locked down"
) ? static_cast<void> (0) : __assert_fail ("(isUnknownLocation() || isRegisterLocation()) && \"location description already locked down\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 44, __PRETTY_FUNCTION__));
45 LocationKind = Register;
46 if (DwarfReg < 32) {
47 emitOp(dwarf::DW_OP_reg0 + DwarfReg, Comment);
48 } else {
49 emitOp(dwarf::DW_OP_regx, Comment);
50 emitUnsigned(DwarfReg);
51 }
52}
53
54void DwarfExpression::addBReg(int DwarfReg, int Offset) {
55 assert(DwarfReg >= 0 && "invalid negative dwarf register number")((DwarfReg >= 0 && "invalid negative dwarf register number"
) ? static_cast<void> (0) : __assert_fail ("DwarfReg >= 0 && \"invalid negative dwarf register number\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 55, __PRETTY_FUNCTION__));
56 assert(!isRegisterLocation() && "location description already locked down")((!isRegisterLocation() && "location description already locked down"
) ? static_cast<void> (0) : __assert_fail ("!isRegisterLocation() && \"location description already locked down\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 56, __PRETTY_FUNCTION__));
57 if (DwarfReg < 32) {
58 emitOp(dwarf::DW_OP_breg0 + DwarfReg);
59 } else {
60 emitOp(dwarf::DW_OP_bregx);
61 emitUnsigned(DwarfReg);
62 }
63 emitSigned(Offset);
64}
65
66void DwarfExpression::addFBReg(int Offset) {
67 emitOp(dwarf::DW_OP_fbreg);
68 emitSigned(Offset);
69}
70
71void DwarfExpression::addOpPiece(unsigned SizeInBits, unsigned OffsetInBits) {
72 if (!SizeInBits)
73 return;
74
75 const unsigned SizeOfByte = 8;
76 if (OffsetInBits > 0 || SizeInBits % SizeOfByte) {
77 emitOp(dwarf::DW_OP_bit_piece);
78 emitUnsigned(SizeInBits);
79 emitUnsigned(OffsetInBits);
80 } else {
81 emitOp(dwarf::DW_OP_piece);
82 unsigned ByteSize = SizeInBits / SizeOfByte;
83 emitUnsigned(ByteSize);
84 }
85 this->OffsetInBits += SizeInBits;
86}
87
88void DwarfExpression::addShr(unsigned ShiftBy) {
89 emitConstu(ShiftBy);
90 emitOp(dwarf::DW_OP_shr);
91}
92
93void DwarfExpression::addAnd(unsigned Mask) {
94 emitConstu(Mask);
95 emitOp(dwarf::DW_OP_and);
96}
97
98bool DwarfExpression::addMachineReg(const TargetRegisterInfo &TRI,
99 unsigned MachineReg, unsigned MaxSize) {
100 if (!TRI.isPhysicalRegister(MachineReg)) {
4
←
Taking false branch
→
101 if (isFrameRegister(TRI, MachineReg)) {
102 DwarfRegs.push_back({-1, 0, nullptr});
103 return true;
104 }
105 return false;
106 }
107
108 int Reg = TRI.getDwarfRegNum(MachineReg, false);
109
110 // If this is a valid register number, emit it.
111 if (Reg >= 0) {
5
←
Assuming 'Reg' is < 0
→
6
←
Taking false branch
→
112 DwarfRegs.push_back({Reg, 0, nullptr});
113 return true;
114 }
115
116 // Walk up the super-register chain until we find a valid number.
117 // For example, EAX on x86_64 is a 32-bit fragment of RAX with offset 0.
118 for (MCSuperRegIterator SR(MachineReg, &TRI); SR.isValid(); ++SR) {
7
←
Loop condition is false. Execution continues on line 133
→
119 Reg = TRI.getDwarfRegNum(*SR, false);
120 if (Reg >= 0) {
121 unsigned Idx = TRI.getSubRegIndex(*SR, MachineReg);
122 unsigned Size = TRI.getSubRegIdxSize(Idx);
123 unsigned RegOffset = TRI.getSubRegIdxOffset(Idx);
124 DwarfRegs.push_back({Reg, 0, "super-register"});
125 // Use a DW_OP_bit_piece to describe the sub-register.
126 setSubRegisterPiece(Size, RegOffset);
127 return true;
128 }
129 }
130
131 // Otherwise, attempt to find a covering set of sub-register numbers.
132 // For example, Q0 on ARM is a composition of D0+D1.
133 unsigned CurPos = 0;
134 // The size of the register in bits.
135 const TargetRegisterClass *RC = TRI.getMinimalPhysRegClass(MachineReg);
136 unsigned RegSize = TRI.getRegSizeInBits(*RC);
137 // Keep track of the bits in the register we already emitted, so we
138 // can avoid emitting redundant aliasing subregs. Because this is
139 // just doing a greedy scan of all subregisters, it is possible that
140 // this doesn't find a combination of subregisters that fully cover
141 // the register (even though one may exist).
142 SmallBitVector Coverage(RegSize, false);
143 for (MCSubRegIterator SR(MachineReg, &TRI); SR.isValid(); ++SR) {
8
←
Loop condition is true. Entering loop body
→
144 unsigned Idx = TRI.getSubRegIndex(MachineReg, *SR);
145 unsigned Size = TRI.getSubRegIdxSize(Idx);
146 unsigned Offset = TRI.getSubRegIdxOffset(Idx);
147 Reg = TRI.getDwarfRegNum(*SR, false);
148 if (Reg < 0)
9
←
Assuming 'Reg' is >= 0
→
10
←
Taking false branch
→
149 continue;
150
151 // Intersection between the bits we already emitted and the bits
152 // covered by this subregister.
153 SmallBitVector CurSubReg(RegSize, false);
11
←
Calling constructor for 'SmallBitVector'
→
14
←
Returning from constructor for 'SmallBitVector'
→
154 CurSubReg.set(Offset, Offset + Size);
15
←
Calling 'SmallBitVector::set'
→
155
156 // If this sub-register has a DWARF number and we haven't covered
157 // its range, emit a DWARF piece for it.
158 if (CurSubReg.test(Coverage)) {
159 // Emit a piece for any gap in the coverage.
160 if (Offset > CurPos)
161 DwarfRegs.push_back({-1, Offset - CurPos, "no DWARF register encoding"});
162 DwarfRegs.push_back(
163 {Reg, std::min<unsigned>(Size, MaxSize - Offset), "sub-register"});
164 if (Offset >= MaxSize)
165 break;
166
167 // Mark it as emitted.
168 Coverage.set(Offset, Offset + Size);
169 CurPos = Offset + Size;
170 }
171 }
172 // Failed to find any DWARF encoding.
173 if (CurPos == 0)
174 return false;
175 // Found a partial or complete DWARF encoding.
176 if (CurPos < RegSize)
177 DwarfRegs.push_back({-1, RegSize - CurPos, "no DWARF register encoding"});
178 return true;
179}
180
181void DwarfExpression::addStackValue() {
182 if (DwarfVersion >= 4)
183 emitOp(dwarf::DW_OP_stack_value);
184}
185
186void DwarfExpression::addSignedConstant(int64_t Value) {
187 assert(isImplicitLocation() || isUnknownLocation())((isImplicitLocation() || isUnknownLocation()) ? static_cast<
void> (0) : __assert_fail ("isImplicitLocation() || isUnknownLocation()"
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 187, __PRETTY_FUNCTION__));
188 LocationKind = Implicit;
189 emitOp(dwarf::DW_OP_consts);
190 emitSigned(Value);
191}
192
193void DwarfExpression::addUnsignedConstant(uint64_t Value) {
194 assert(isImplicitLocation() || isUnknownLocation())((isImplicitLocation() || isUnknownLocation()) ? static_cast<
void> (0) : __assert_fail ("isImplicitLocation() || isUnknownLocation()"
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 194, __PRETTY_FUNCTION__));
195 LocationKind = Implicit;
196 emitConstu(Value);
197}
198
199void DwarfExpression::addUnsignedConstant(const APInt &Value) {
200 assert(isImplicitLocation() || isUnknownLocation())((isImplicitLocation() || isUnknownLocation()) ? static_cast<
void> (0) : __assert_fail ("isImplicitLocation() || isUnknownLocation()"
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 200, __PRETTY_FUNCTION__));
201 LocationKind = Implicit;
202
203 unsigned Size = Value.getBitWidth();
204 const uint64_t *Data = Value.getRawData();
205
206 // Chop it up into 64-bit pieces, because that's the maximum that
207 // addUnsignedConstant takes.
208 unsigned Offset = 0;
209 while (Offset < Size) {
210 addUnsignedConstant(*Data++);
211 if (Offset == 0 && Size <= 64)
212 break;
213 addStackValue();
214 addOpPiece(std::min(Size - Offset, 64u), Offset);
215 Offset += 64;
216 }
217}
218
219bool DwarfExpression::addMachineRegExpression(const TargetRegisterInfo &TRI,
220 DIExpressionCursor &ExprCursor,
221 unsigned MachineReg,
222 unsigned FragmentOffsetInBits) {
223 auto Fragment = ExprCursor.getFragmentInfo();
224 if (!addMachineReg(TRI, MachineReg, Fragment ? Fragment->SizeInBits : ~1U)) {
1
Assuming the condition is false
→
2
←
'?' condition is false
→
3
←
Calling 'DwarfExpression::addMachineReg'
→
225 LocationKind = Unknown;
226 return false;
227 }
228
229 bool HasComplexExpression = false;
230 auto Op = ExprCursor.peek();
231 if (Op && Op->getOp() != dwarf::DW_OP_LLVM_fragment)
232 HasComplexExpression = true;
233
234 // If the register can only be described by a complex expression (i.e.,
235 // multiple subregisters) it doesn't safely compose with another complex
236 // expression. For example, it is not possible to apply a DW_OP_deref
237 // operation to multiple DW_OP_pieces.
238 if (HasComplexExpression && DwarfRegs.size() > 1) {
239 DwarfRegs.clear();
240 LocationKind = Unknown;
241 return false;
242 }
243
244 // Handle simple register locations.
245 if (!isMemoryLocation() && !HasComplexExpression) {
246 for (auto &Reg : DwarfRegs) {
247 if (Reg.DwarfRegNo >= 0)
248 addReg(Reg.DwarfRegNo, Reg.Comment);
249 addOpPiece(Reg.Size);
250 }
251 DwarfRegs.clear();
252 return true;
253 }
254
255 // Don't emit locations that cannot be expressed without DW_OP_stack_value.
256 if (DwarfVersion < 4)
257 if (any_of(ExprCursor, [](DIExpression::ExprOperand Op) -> bool {
258 return Op.getOp() == dwarf::DW_OP_stack_value;
259 })) {
260 DwarfRegs.clear();
261 LocationKind = Unknown;
262 return false;
263 }
264
265 assert(DwarfRegs.size() == 1)((DwarfRegs.size() == 1) ? static_cast<void> (0) : __assert_fail
("DwarfRegs.size() == 1", "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 265, __PRETTY_FUNCTION__));
266 auto Reg = DwarfRegs[0];
267 bool FBReg = isFrameRegister(TRI, MachineReg);
268 int SignedOffset = 0;
269 assert(Reg.Size == 0 && "subregister has same size as superregister")((Reg.Size == 0 && "subregister has same size as superregister"
) ? static_cast<void> (0) : __assert_fail ("Reg.Size == 0 && \"subregister has same size as superregister\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 269, __PRETTY_FUNCTION__));
270
271 // Pattern-match combinations for which more efficient representations exist.
272 // [Reg, DW_OP_plus_uconst, Offset] --> [DW_OP_breg, Offset].
273 if (Op && (Op->getOp() == dwarf::DW_OP_plus_uconst)) {
274 SignedOffset = Op->getArg(0);
275 ExprCursor.take();
276 }
277
278 // [Reg, DW_OP_constu, Offset, DW_OP_plus] --> [DW_OP_breg, Offset]
279 // [Reg, DW_OP_constu, Offset, DW_OP_minus] --> [DW_OP_breg,-Offset]
280 // If Reg is a subregister we need to mask it out before subtracting.
281 if (Op && Op->getOp() == dwarf::DW_OP_constu) {
282 auto N = ExprCursor.peekNext();
283 if (N && (N->getOp() == dwarf::DW_OP_plus ||
284 (N->getOp() == dwarf::DW_OP_minus && !SubRegisterSizeInBits))) {
285 int Offset = Op->getArg(0);
286 SignedOffset = (N->getOp() == dwarf::DW_OP_minus) ? -Offset : Offset;
287 ExprCursor.consume(2);
288 }
289 }
290
291 if (FBReg)
292 addFBReg(SignedOffset);
293 else
294 addBReg(Reg.DwarfRegNo, SignedOffset);
295 DwarfRegs.clear();
296 return true;
297}
298
299/// Assuming a well-formed expression, match "DW_OP_deref* DW_OP_LLVM_fragment?".
300static bool isMemoryLocation(DIExpressionCursor ExprCursor) {
301 while (ExprCursor) {
302 auto Op = ExprCursor.take();
303 switch (Op->getOp()) {
304 case dwarf::DW_OP_deref:
305 case dwarf::DW_OP_LLVM_fragment:
306 break;
307 default:
308 return false;
309 }
310 }
311 return true;
312}
313
314void DwarfExpression::addExpression(DIExpressionCursor &&ExprCursor,
315 unsigned FragmentOffsetInBits) {
316 // If we need to mask out a subregister, do it now, unless the next
317 // operation would emit an OpPiece anyway.
318 auto N = ExprCursor.peek();
319 if (SubRegisterSizeInBits && N && (N->getOp() != dwarf::DW_OP_LLVM_fragment))
320 maskSubRegister();
321
322 Optional<DIExpression::ExprOperand> PrevConvertOp = None;
323
324 while (ExprCursor) {
325 auto Op = ExprCursor.take();
326 switch (Op->getOp()) {
327 case dwarf::DW_OP_LLVM_fragment: {
328 unsigned SizeInBits = Op->getArg(1);
329 unsigned FragmentOffset = Op->getArg(0);
330 // The fragment offset must have already been adjusted by emitting an
331 // empty DW_OP_piece / DW_OP_bit_piece before we emitted the base
332 // location.
333 assert(OffsetInBits >= FragmentOffset && "fragment offset not added?")((OffsetInBits >= FragmentOffset && "fragment offset not added?"
) ? static_cast<void> (0) : __assert_fail ("OffsetInBits >= FragmentOffset && \"fragment offset not added?\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 333, __PRETTY_FUNCTION__));
334
335 // If addMachineReg already emitted DW_OP_piece operations to represent
336 // a super-register by splicing together sub-registers, subtract the size
337 // of the pieces that was already emitted.
338 SizeInBits -= OffsetInBits - FragmentOffset;
339
340 // If addMachineReg requested a DW_OP_bit_piece to stencil out a
341 // sub-register that is smaller than the current fragment's size, use it.
342 if (SubRegisterSizeInBits)
343 SizeInBits = std::min<unsigned>(SizeInBits, SubRegisterSizeInBits);
344
345 // Emit a DW_OP_stack_value for implicit location descriptions.
346 if (isImplicitLocation())
347 addStackValue();
348
349 // Emit the DW_OP_piece.
350 addOpPiece(SizeInBits, SubRegisterOffsetInBits);
351 setSubRegisterPiece(0, 0);
352 // Reset the location description kind.
353 LocationKind = Unknown;
354 return;
355 }
356 case dwarf::DW_OP_plus_uconst:
357 assert(!isRegisterLocation())((!isRegisterLocation()) ? static_cast<void> (0) : __assert_fail
("!isRegisterLocation()", "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 357, __PRETTY_FUNCTION__));
358 emitOp(dwarf::DW_OP_plus_uconst);
359 emitUnsigned(Op->getArg(0));
360 break;
361 case dwarf::DW_OP_plus:
362 case dwarf::DW_OP_minus:
363 case dwarf::DW_OP_mul:
364 case dwarf::DW_OP_div:
365 case dwarf::DW_OP_mod:
366 case dwarf::DW_OP_or:
367 case dwarf::DW_OP_and:
368 case dwarf::DW_OP_xor:
369 case dwarf::DW_OP_shl:
370 case dwarf::DW_OP_shr:
371 case dwarf::DW_OP_shra:
372 case dwarf::DW_OP_lit0:
373 case dwarf::DW_OP_not:
374 case dwarf::DW_OP_dup:
375 emitOp(Op->getOp());
376 break;
377 case dwarf::DW_OP_deref:
378 assert(!isRegisterLocation())((!isRegisterLocation()) ? static_cast<void> (0) : __assert_fail
("!isRegisterLocation()", "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 378, __PRETTY_FUNCTION__));
379 if (!isMemoryLocation() && ::isMemoryLocation(ExprCursor))
380 // Turning this into a memory location description makes the deref
381 // implicit.
382 LocationKind = Memory;
383 else
384 emitOp(dwarf::DW_OP_deref);
385 break;
386 case dwarf::DW_OP_constu:
387 assert(!isRegisterLocation())((!isRegisterLocation()) ? static_cast<void> (0) : __assert_fail
("!isRegisterLocation()", "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 387, __PRETTY_FUNCTION__));
388 emitConstu(Op->getArg(0));
389 break;
390 case dwarf::DW_OP_LLVM_convert: {
391 unsigned BitSize = Op->getArg(0);
392 dwarf::TypeKind Encoding = static_cast<dwarf::TypeKind>(Op->getArg(1));
393 if (DwarfVersion >= 5) {
394 emitOp(dwarf::DW_OP_convert);
395 // Reuse the base_type if we already have one in this CU otherwise we
396 // create a new one.
397 unsigned I = 0, E = CU.ExprRefedBaseTypes.size();
398 for (; I != E; ++I)
399 if (CU.ExprRefedBaseTypes[I].BitSize == BitSize &&
400 CU.ExprRefedBaseTypes[I].Encoding == Encoding)
401 break;
402
403 if (I == E)
404 CU.ExprRefedBaseTypes.emplace_back(BitSize, Encoding);
405
406 // If targeting a location-list; simply emit the index into the raw
407 // byte stream as ULEB128, DwarfDebug::emitDebugLocEntry has been
408 // fitted with means to extract it later.
409 // If targeting a inlined DW_AT_location; insert a DIEBaseTypeRef
410 // (containing the index and a resolve mechanism during emit) into the
411 // DIE value list.
412 emitBaseTypeRef(I);
413 } else {
414 if (PrevConvertOp && PrevConvertOp->getArg(0) < BitSize) {
415 if (Encoding == dwarf::DW_ATE_signed)
416 emitLegacySExt(PrevConvertOp->getArg(0));
417 else if (Encoding == dwarf::DW_ATE_unsigned)
418 emitLegacyZExt(PrevConvertOp->getArg(0));
419 PrevConvertOp = None;
420 } else {
421 PrevConvertOp = Op;
422 }
423 }
424 break;
425 }
426 case dwarf::DW_OP_stack_value:
427 LocationKind = Implicit;
428 break;
429 case dwarf::DW_OP_swap:
430 assert(!isRegisterLocation())((!isRegisterLocation()) ? static_cast<void> (0) : __assert_fail
("!isRegisterLocation()", "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 430, __PRETTY_FUNCTION__));
431 emitOp(dwarf::DW_OP_swap);
432 break;
433 case dwarf::DW_OP_xderef:
434 assert(!isRegisterLocation())((!isRegisterLocation()) ? static_cast<void> (0) : __assert_fail
("!isRegisterLocation()", "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 434, __PRETTY_FUNCTION__));
435 emitOp(dwarf::DW_OP_xderef);
436 break;
437 case dwarf::DW_OP_deref_size:
438 emitOp(dwarf::DW_OP_deref_size);
439 emitData1(Op->getArg(0));
440 break;
441 default:
442 llvm_unreachable("unhandled opcode found in expression")::llvm::llvm_unreachable_internal("unhandled opcode found in expression"
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 442);
443 }
444 }
445
446 if (isImplicitLocation())
447 // Turn this into an implicit location description.
448 addStackValue();
449}
450
451/// add masking operations to stencil out a subregister.
452void DwarfExpression::maskSubRegister() {
453 assert(SubRegisterSizeInBits && "no subregister was registered")((SubRegisterSizeInBits && "no subregister was registered"
) ? static_cast<void> (0) : __assert_fail ("SubRegisterSizeInBits && \"no subregister was registered\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 453, __PRETTY_FUNCTION__));
454 if (SubRegisterOffsetInBits > 0)
455 addShr(SubRegisterOffsetInBits);
456 uint64_t Mask = (1ULL << (uint64_t)SubRegisterSizeInBits) - 1ULL;
457 addAnd(Mask);
458}
459
460void DwarfExpression::finalize() {
461 assert(DwarfRegs.size() == 0 && "dwarf registers not emitted")((DwarfRegs.size() == 0 && "dwarf registers not emitted"
) ? static_cast<void> (0) : __assert_fail ("DwarfRegs.size() == 0 && \"dwarf registers not emitted\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 461, __PRETTY_FUNCTION__));
462 // Emit any outstanding DW_OP_piece operations to mask out subregisters.
463 if (SubRegisterSizeInBits == 0)
464 return;
465 // Don't emit a DW_OP_piece for a subregister at offset 0.
466 if (SubRegisterOffsetInBits == 0)
467 return;
468 addOpPiece(SubRegisterSizeInBits, SubRegisterOffsetInBits);
469}
470
471void DwarfExpression::addFragmentOffset(const DIExpression *Expr) {
472 if (!Expr || !Expr->isFragment())
473 return;
474
475 uint64_t FragmentOffset = Expr->getFragmentInfo()->OffsetInBits;
476 assert(FragmentOffset >= OffsetInBits &&((FragmentOffset >= OffsetInBits && "overlapping or duplicate fragments"
) ? static_cast<void> (0) : __assert_fail ("FragmentOffset >= OffsetInBits && \"overlapping or duplicate fragments\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 477, __PRETTY_FUNCTION__))
477 "overlapping or duplicate fragments")((FragmentOffset >= OffsetInBits && "overlapping or duplicate fragments"
) ? static_cast<void> (0) : __assert_fail ("FragmentOffset >= OffsetInBits && \"overlapping or duplicate fragments\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/DwarfExpression.cpp"
, 477, __PRETTY_FUNCTION__));
478 if (FragmentOffset > OffsetInBits)
479 addOpPiece(FragmentOffset - OffsetInBits);
480 OffsetInBits = FragmentOffset;
481}
482
483void DwarfExpression::emitLegacySExt(unsigned FromBits) {
484 // (((X >> (FromBits - 1)) * (~0)) << FromBits) | X
485 emitOp(dwarf::DW_OP_dup);
486 emitOp(dwarf::DW_OP_constu);
487 emitUnsigned(FromBits - 1);
488 emitOp(dwarf::DW_OP_shr);
489 emitOp(dwarf::DW_OP_lit0);
490 emitOp(dwarf::DW_OP_not);
491 emitOp(dwarf::DW_OP_mul);
492 emitOp(dwarf::DW_OP_constu);
493 emitUnsigned(FromBits);
494 emitOp(dwarf::DW_OP_shl);
495 emitOp(dwarf::DW_OP_or);
496}
497
498void DwarfExpression::emitLegacyZExt(unsigned FromBits) {
499 // (X & (1 << FromBits - 1))
500 emitOp(dwarf::DW_OP_constu);
501 emitUnsigned((1ULL << FromBits) - 1);
502 emitOp(dwarf::DW_OP_and);
503}
←

/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h

1//===- llvm/ADT/SmallBitVector.h - 'Normally small' bit vectors -*- 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// This file implements the SmallBitVector class.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef LLVM_ADT_SMALLBITVECTOR_H
14#define LLVM_ADT_SMALLBITVECTOR_H
15
16#include "llvm/ADT/BitVector.h"
17#include "llvm/ADT/iterator_range.h"
18#include "llvm/Support/MathExtras.h"
19#include <algorithm>
20#include <cassert>
21#include <climits>
22#include <cstddef>
23#include <cstdint>
24#include <limits>
25#include <utility>
26
27namespace llvm {
28
29/// This is a 'bitvector' (really, a variable-sized bit array), optimized for
30/// the case when the array is small. It contains one pointer-sized field, which
31/// is directly used as a plain collection of bits when possible, or as a
32/// pointer to a larger heap-allocated array when necessary. This allows normal
33/// "small" cases to be fast without losing generality for large inputs.
34class SmallBitVector {
35 // TODO: In "large" mode, a pointer to a BitVector is used, leading to an
36 // unnecessary level of indirection. It would be more efficient to use a
37 // pointer to memory containing size, allocation size, and the array of bits.
38 uintptr_t X = 1;
39
40 enum {
41 // The number of bits in this class.
42 NumBaseBits = sizeof(uintptr_t) * CHAR_BIT8,
43
44 // One bit is used to discriminate between small and large mode. The
45 // remaining bits are used for the small-mode representation.
46 SmallNumRawBits = NumBaseBits - 1,
47
48 // A few more bits are used to store the size of the bit set in small mode.
49 // Theoretically this is a ceil-log2. These bits are encoded in the most
50 // significant bits of the raw bits.
51 SmallNumSizeBits = (NumBaseBits == 32 ? 5 :
52 NumBaseBits == 64 ? 6 :
53 SmallNumRawBits),
54
55 // The remaining bits are used to store the actual set in small mode.
56 SmallNumDataBits = SmallNumRawBits - SmallNumSizeBits
57 };
58
59 static_assert(NumBaseBits == 64 || NumBaseBits == 32,
60 "Unsupported word size");
61
62public:
63 using size_type = unsigned;
64
65 // Encapsulation of a single bit.
66 class reference {
67 SmallBitVector &TheVector;
68 unsigned BitPos;
69
70 public:
71 reference(SmallBitVector &b, unsigned Idx) : TheVector(b), BitPos(Idx) {}
72
73 reference(const reference&) = default;
74
75 reference& operator=(reference t) {
76 *this = bool(t);
77 return *this;
78 }
79
80 reference& operator=(bool t) {
81 if (t)
82 TheVector.set(BitPos);
83 else
84 TheVector.reset(BitPos);
85 return *this;
86 }
87
88 operator bool() const {
89 return const_cast<const SmallBitVector &>(TheVector).operator[](BitPos);
90 }
91 };
92
93private:
94 BitVector *getPointer() const {
95 assert(!isSmall())((!isSmall()) ? static_cast<void> (0) : __assert_fail (
"!isSmall()", "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h"
, 95, __PRETTY_FUNCTION__));
96 return reinterpret_cast<BitVector *>(X);
97 }
98
99 void switchToSmall(uintptr_t NewSmallBits, size_t NewSize) {
100 X = 1;
101 setSmallSize(NewSize);
102 setSmallBits(NewSmallBits);
103 }
104
105 void switchToLarge(BitVector *BV) {
106 X = reinterpret_cast<uintptr_t>(BV);
107 assert(!isSmall() && "Tried to use an unaligned pointer")((!isSmall() && "Tried to use an unaligned pointer") ?
static_cast<void> (0) : __assert_fail ("!isSmall() && \"Tried to use an unaligned pointer\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h"
, 107, __PRETTY_FUNCTION__));
108 }
109
110 // Return all the bits used for the "small" representation; this includes
111 // bits for the size as well as the element bits.
112 uintptr_t getSmallRawBits() const {
113 assert(isSmall())((isSmall()) ? static_cast<void> (0) : __assert_fail ("isSmall()"
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h"
, 113, __PRETTY_FUNCTION__));
114 return X >> 1;
115 }
116
117 void setSmallRawBits(uintptr_t NewRawBits) {
118 assert(isSmall())((isSmall()) ? static_cast<void> (0) : __assert_fail ("isSmall()"
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h"
, 118, __PRETTY_FUNCTION__));
26
←
Assuming the condition is true
→
27
←
'?' condition is true
→
119 X = (NewRawBits << 1) | uintptr_t(1);
120 }
28
←
Potential memory leak
121
122 // Return the size.
123 size_t getSmallSize() const { return getSmallRawBits() >> SmallNumDataBits; }
124
125 void setSmallSize(size_t Size) {
126 setSmallRawBits(getSmallBits() | (Size << SmallNumDataBits));
127 }
128
129 // Return the element bits.
130 uintptr_t getSmallBits() const {
131 return getSmallRawBits() & ~(~uintptr_t(0) << getSmallSize());
132 }
133
134 void setSmallBits(uintptr_t NewBits) {
135 setSmallRawBits((NewBits & ~(~uintptr_t(0) << getSmallSize())) |
25
←
Calling 'SmallBitVector::setSmallRawBits'
→
136 (getSmallSize() << SmallNumDataBits));
137 }
138
139public:
140 /// Creates an empty bitvector.
141 SmallBitVector() = default;
142
143 /// Creates a bitvector of specified number of bits. All bits are initialized
144 /// to the specified value.
145 explicit SmallBitVector(unsigned s, bool t = false) {
146 if (s <= SmallNumDataBits)
12
←
Taking false branch
→
147 switchToSmall(t ? ~uintptr_t(0) : 0, s);
148 else
149 switchToLarge(new BitVector(s, t));
13
←
Memory is allocated
→
150 }
151
152 /// SmallBitVector copy ctor.
153 SmallBitVector(const SmallBitVector &RHS) {
154 if (RHS.isSmall())
155 X = RHS.X;
156 else
157 switchToLarge(new BitVector(*RHS.getPointer()));
158 }
159
160 SmallBitVector(SmallBitVector &&RHS) : X(RHS.X) {
161 RHS.X = 1;
162 }
163
164 ~SmallBitVector() {
165 if (!isSmall())
166 delete getPointer();
167 }
168
169 using const_set_bits_iterator = const_set_bits_iterator_impl<SmallBitVector>;
170 using set_iterator = const_set_bits_iterator;
171
172 const_set_bits_iterator set_bits_begin() const {
173 return const_set_bits_iterator(*this);
174 }
175
176 const_set_bits_iterator set_bits_end() const {
177 return const_set_bits_iterator(*this, -1);
178 }
179
180 iterator_range<const_set_bits_iterator> set_bits() const {
181 return make_range(set_bits_begin(), set_bits_end());
182 }
183
184 bool isSmall() const { return X & uintptr_t(1); }
185
186 /// Tests whether there are no bits in this bitvector.
187 bool empty() const {
188 return isSmall() ? getSmallSize() == 0 : getPointer()->empty();
189 }
190
191 /// Returns the number of bits in this bitvector.
192 size_t size() const {
193 return isSmall() ? getSmallSize() : getPointer()->size();
194 }
195
196 /// Returns the number of bits which are set.
197 size_type count() const {
198 if (isSmall()) {
199 uintptr_t Bits = getSmallBits();
200 return countPopulation(Bits);
201 }
202 return getPointer()->count();
203 }
204
205 /// Returns true if any bit is set.
206 bool any() const {
207 if (isSmall())
208 return getSmallBits() != 0;
209 return getPointer()->any();
210 }
211
212 /// Returns true if all bits are set.
213 bool all() const {
214 if (isSmall())
215 return getSmallBits() == (uintptr_t(1) << getSmallSize()) - 1;
216 return getPointer()->all();
217 }
218
219 /// Returns true if none of the bits are set.
220 bool none() const {
221 if (isSmall())
222 return getSmallBits() == 0;
223 return getPointer()->none();
224 }
225
226 /// Returns the index of the first set bit, -1 if none of the bits are set.
227 int find_first() const {
228 if (isSmall()) {
229 uintptr_t Bits = getSmallBits();
230 if (Bits == 0)
231 return -1;
232 return countTrailingZeros(Bits);
233 }
234 return getPointer()->find_first();
235 }
236
237 int find_last() const {
238 if (isSmall()) {
239 uintptr_t Bits = getSmallBits();
240 if (Bits == 0)
241 return -1;
242 return NumBaseBits - countLeadingZeros(Bits) - 1;
243 }
244 return getPointer()->find_last();
245 }
246
247 /// Returns the index of the first unset bit, -1 if all of the bits are set.
248 int find_first_unset() const {
249 if (isSmall()) {
250 if (count() == getSmallSize())
251 return -1;
252
253 uintptr_t Bits = getSmallBits();
254 return countTrailingOnes(Bits);
255 }
256 return getPointer()->find_first_unset();
257 }
258
259 int find_last_unset() const {
260 if (isSmall()) {
261 if (count() == getSmallSize())
262 return -1;
263
264 uintptr_t Bits = getSmallBits();
265 // Set unused bits.
266 Bits |= ~uintptr_t(0) << getSmallSize();
267 return NumBaseBits - countLeadingOnes(Bits) - 1;
268 }
269 return getPointer()->find_last_unset();
270 }
271
272 /// Returns the index of the next set bit following the "Prev" bit.
273 /// Returns -1 if the next set bit is not found.
274 int find_next(unsigned Prev) const {
275 if (isSmall()) {
276 uintptr_t Bits = getSmallBits();
277 // Mask off previous bits.
278 Bits &= ~uintptr_t(0) << (Prev + 1);
279 if (Bits == 0 || Prev + 1 >= getSmallSize())
280 return -1;
281 return countTrailingZeros(Bits);
282 }
283 return getPointer()->find_next(Prev);
284 }
285
286 /// Returns the index of the next unset bit following the "Prev" bit.
287 /// Returns -1 if the next unset bit is not found.
288 int find_next_unset(unsigned Prev) const {
289 if (isSmall()) {
290 ++Prev;
291 uintptr_t Bits = getSmallBits();
292 // Mask in previous bits.
293 uintptr_t Mask = (1 << Prev) - 1;
294 Bits |= Mask;
295
296 if (Bits == ~uintptr_t(0) || Prev + 1 >= getSmallSize())
297 return -1;
298 return countTrailingOnes(Bits);
299 }
300 return getPointer()->find_next_unset(Prev);
301 }
302
303 /// find_prev - Returns the index of the first set bit that precedes the
304 /// the bit at \p PriorTo. Returns -1 if all previous bits are unset.
305 int find_prev(unsigned PriorTo) const {
306 if (isSmall()) {
307 if (PriorTo == 0)
308 return -1;
309
310 --PriorTo;
311 uintptr_t Bits = getSmallBits();
312 Bits &= maskTrailingOnes<uintptr_t>(PriorTo + 1);
313 if (Bits == 0)
314 return -1;
315
316 return NumBaseBits - countLeadingZeros(Bits) - 1;
317 }
318 return getPointer()->find_prev(PriorTo);
319 }
320
321 /// Clear all bits.
322 void clear() {
323 if (!isSmall())
324 delete getPointer();
325 switchToSmall(0, 0);
326 }
327
328 /// Grow or shrink the bitvector.
329 void resize(unsigned N, bool t = false) {
330 if (!isSmall()) {
331 getPointer()->resize(N, t);
332 } else if (SmallNumDataBits >= N) {
333 uintptr_t NewBits = t ? ~uintptr_t(0) << getSmallSize() : 0;
334 setSmallSize(N);
335 setSmallBits(NewBits | getSmallBits());
336 } else {
337 BitVector *BV = new BitVector(N, t);
338 uintptr_t OldBits = getSmallBits();
339 for (size_t i = 0, e = getSmallSize(); i != e; ++i)
340 (*BV)[i] = (OldBits >> i) & 1;
341 switchToLarge(BV);
342 }
343 }
344
345 void reserve(unsigned N) {
346 if (isSmall()) {
347 if (N > SmallNumDataBits) {
348 uintptr_t OldBits = getSmallRawBits();
349 size_t SmallSize = getSmallSize();
350 BitVector *BV = new BitVector(SmallSize);
351 for (size_t i = 0; i < SmallSize; ++i)
352 if ((OldBits >> i) & 1)
353 BV->set(i);
354 BV->reserve(N);
355 switchToLarge(BV);
356 }
357 } else {
358 getPointer()->reserve(N);
359 }
360 }
361
362 // Set, reset, flip
363 SmallBitVector &set() {
364 if (isSmall())
365 setSmallBits(~uintptr_t(0));
366 else
367 getPointer()->set();
368 return *this;
369 }
370
371 SmallBitVector &set(unsigned Idx) {
372 if (isSmall()) {
373 assert(Idx <= static_cast<unsigned>(((Idx <= static_cast<unsigned>( std::numeric_limits<
uintptr_t>::digits) && "undefined behavior") ? static_cast
<void> (0) : __assert_fail ("Idx <= static_cast<unsigned>( std::numeric_limits<uintptr_t>::digits) && \"undefined behavior\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h"
, 375, __PRETTY_FUNCTION__))
374 std::numeric_limits<uintptr_t>::digits) &&((Idx <= static_cast<unsigned>( std::numeric_limits<
uintptr_t>::digits) && "undefined behavior") ? static_cast
<void> (0) : __assert_fail ("Idx <= static_cast<unsigned>( std::numeric_limits<uintptr_t>::digits) && \"undefined behavior\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h"
, 375, __PRETTY_FUNCTION__))
375 "undefined behavior")((Idx <= static_cast<unsigned>( std::numeric_limits<
uintptr_t>::digits) && "undefined behavior") ? static_cast
<void> (0) : __assert_fail ("Idx <= static_cast<unsigned>( std::numeric_limits<uintptr_t>::digits) && \"undefined behavior\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h"
, 375, __PRETTY_FUNCTION__));
376 setSmallBits(getSmallBits() | (uintptr_t(1) << Idx));
377 }
378 else
379 getPointer()->set(Idx);
380 return *this;
381 }
382
383 /// Efficiently set a range of bits in [I, E)
384 SmallBitVector &set(unsigned I, unsigned E) {
385 assert(I <= E && "Attempted to set backwards range!")((I <= E && "Attempted to set backwards range!") ?
static_cast<void> (0) : __assert_fail ("I <= E && \"Attempted to set backwards range!\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h"
, 385, __PRETTY_FUNCTION__));
16
←
Assuming 'I' is <= 'E'
→
17
←
'?' condition is true
→
386 assert(E <= size() && "Attempted to set out-of-bounds range!")((E <= size() && "Attempted to set out-of-bounds range!"
) ? static_cast<void> (0) : __assert_fail ("E <= size() && \"Attempted to set out-of-bounds range!\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h"
, 386, __PRETTY_FUNCTION__));
18
←
Assuming the condition is true
→
19
←
'?' condition is true
→
387 if (I == E) return *this;
20
←
Assuming 'I' is not equal to 'E'
→
21
←
Taking false branch
→
388 if (isSmall()) {
22
←
Assuming the condition is true
→
23
←
Taking true branch
→
389 uintptr_t EMask = ((uintptr_t)1) << E;
390 uintptr_t IMask = ((uintptr_t)1) << I;
391 uintptr_t Mask = EMask - IMask;
392 setSmallBits(getSmallBits() | Mask);
24
←
Calling 'SmallBitVector::setSmallBits'
→
393 } else
394 getPointer()->set(I, E);
395 return *this;
396 }
397
398 SmallBitVector &reset() {
399 if (isSmall())
400 setSmallBits(0);
401 else
402 getPointer()->reset();
403 return *this;
404 }
405
406 SmallBitVector &reset(unsigned Idx) {
407 if (isSmall())
408 setSmallBits(getSmallBits() & ~(uintptr_t(1) << Idx));
409 else
410 getPointer()->reset(Idx);
411 return *this;
412 }
413
414 /// Efficiently reset a range of bits in [I, E)
415 SmallBitVector &reset(unsigned I, unsigned E) {
416 assert(I <= E && "Attempted to reset backwards range!")((I <= E && "Attempted to reset backwards range!")
? static_cast<void> (0) : __assert_fail ("I <= E && \"Attempted to reset backwards range!\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h"
, 416, __PRETTY_FUNCTION__));
417 assert(E <= size() && "Attempted to reset out-of-bounds range!")((E <= size() && "Attempted to reset out-of-bounds range!"
) ? static_cast<void> (0) : __assert_fail ("E <= size() && \"Attempted to reset out-of-bounds range!\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h"
, 417, __PRETTY_FUNCTION__));
418 if (I == E) return *this;
419 if (isSmall()) {
420 uintptr_t EMask = ((uintptr_t)1) << E;
421 uintptr_t IMask = ((uintptr_t)1) << I;
422 uintptr_t Mask = EMask - IMask;
423 setSmallBits(getSmallBits() & ~Mask);
424 } else
425 getPointer()->reset(I, E);
426 return *this;
427 }
428
429 SmallBitVector &flip() {
430 if (isSmall())
431 setSmallBits(~getSmallBits());
432 else
433 getPointer()->flip();
434 return *this;
435 }
436
437 SmallBitVector &flip(unsigned Idx) {
438 if (isSmall())
439 setSmallBits(getSmallBits() ^ (uintptr_t(1) << Idx));
440 else
441 getPointer()->flip(Idx);
442 return *this;
443 }
444
445 // No argument flip.
446 SmallBitVector operator~() const {
447 return SmallBitVector(*this).flip();
448 }
449
450 // Indexing.
451 reference operator[](unsigned Idx) {
452 assert(Idx < size() && "Out-of-bounds Bit access.")((Idx < size() && "Out-of-bounds Bit access.") ? static_cast
<void> (0) : __assert_fail ("Idx < size() && \"Out-of-bounds Bit access.\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h"
, 452, __PRETTY_FUNCTION__));
453 return reference(*this, Idx);
454 }
455
456 bool operator[](unsigned Idx) const {
457 assert(Idx < size() && "Out-of-bounds Bit access.")((Idx < size() && "Out-of-bounds Bit access.") ? static_cast
<void> (0) : __assert_fail ("Idx < size() && \"Out-of-bounds Bit access.\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h"
, 457, __PRETTY_FUNCTION__));
458 if (isSmall())
459 return ((getSmallBits() >> Idx) & 1) != 0;
460 return getPointer()->operator[](Idx);
461 }
462
463 bool test(unsigned Idx) const {
464 return (*this)[Idx];
465 }
466
467 // Push single bit to end of vector.
468 void push_back(bool Val) {
469 resize(size() + 1, Val);
470 }
471
472 /// Test if any common bits are set.
473 bool anyCommon(const SmallBitVector &RHS) const {
474 if (isSmall() && RHS.isSmall())
475 return (getSmallBits() & RHS.getSmallBits()) != 0;
476 if (!isSmall() && !RHS.isSmall())
477 return getPointer()->anyCommon(*RHS.getPointer());
478
479 for (unsigned i = 0, e = std::min(size(), RHS.size()); i != e; ++i)
480 if (test(i) && RHS.test(i))
481 return true;
482 return false;
483 }
484
485 // Comparison operators.
486 bool operator==(const SmallBitVector &RHS) const {
487 if (size() != RHS.size())
488 return false;
489 if (isSmall() && RHS.isSmall())
490 return getSmallBits() == RHS.getSmallBits();
491 else if (!isSmall() && !RHS.isSmall())
492 return *getPointer() == *RHS.getPointer();
493 else {
494 for (size_t i = 0, e = size(); i != e; ++i) {
495 if ((*this)[i] != RHS[i])
496 return false;
497 }
498 return true;
499 }
500 }
501
502 bool operator!=(const SmallBitVector &RHS) const {
503 return !(*this == RHS);
504 }
505
506 // Intersection, union, disjoint union.
507 // FIXME BitVector::operator&= does not resize the LHS but this does
508 SmallBitVector &operator&=(const SmallBitVector &RHS) {
509 resize(std::max(size(), RHS.size()));
510 if (isSmall() && RHS.isSmall())
511 setSmallBits(getSmallBits() & RHS.getSmallBits());
512 else if (!isSmall() && !RHS.isSmall())
513 getPointer()->operator&=(*RHS.getPointer());
514 else {
515 size_t i, e;
516 for (i = 0, e = std::min(size(), RHS.size()); i != e; ++i)
517 (*this)[i] = test(i) && RHS.test(i);
518 for (e = size(); i != e; ++i)
519 reset(i);
520 }
521 return *this;
522 }
523
524 /// Reset bits that are set in RHS. Same as *this &= ~RHS.
525 SmallBitVector &reset(const SmallBitVector &RHS) {
526 if (isSmall() && RHS.isSmall())
527 setSmallBits(getSmallBits() & ~RHS.getSmallBits());
528 else if (!isSmall() && !RHS.isSmall())
529 getPointer()->reset(*RHS.getPointer());
530 else
531 for (unsigned i = 0, e = std::min(size(), RHS.size()); i != e; ++i)
532 if (RHS.test(i))
533 reset(i);
534
535 return *this;
536 }
537
538 /// Check if (This - RHS) is zero. This is the same as reset(RHS) and any().
539 bool test(const SmallBitVector &RHS) const {
540 if (isSmall() && RHS.isSmall())
541 return (getSmallBits() & ~RHS.getSmallBits()) != 0;
542 if (!isSmall() && !RHS.isSmall())
543 return getPointer()->test(*RHS.getPointer());
544
545 unsigned i, e;
546 for (i = 0, e = std::min(size(), RHS.size()); i != e; ++i)
547 if (test(i) && !RHS.test(i))
548 return true;
549
550 for (e = size(); i != e; ++i)
551 if (test(i))
552 return true;
553
554 return false;
555 }
556
557 SmallBitVector &operator|=(const SmallBitVector &RHS) {
558 resize(std::max(size(), RHS.size()));
559 if (isSmall() && RHS.isSmall())
560 setSmallBits(getSmallBits() | RHS.getSmallBits());
561 else if (!isSmall() && !RHS.isSmall())
562 getPointer()->operator|=(*RHS.getPointer());
563 else {
564 for (size_t i = 0, e = RHS.size(); i != e; ++i)
565 (*this)[i] = test(i) || RHS.test(i);
566 }
567 return *this;
568 }
569
570 SmallBitVector &operator^=(const SmallBitVector &RHS) {
571 resize(std::max(size(), RHS.size()));
572 if (isSmall() && RHS.isSmall())
573 setSmallBits(getSmallBits() ^ RHS.getSmallBits());
574 else if (!isSmall() && !RHS.isSmall())
575 getPointer()->operator^=(*RHS.getPointer());
576 else {
577 for (size_t i = 0, e = RHS.size(); i != e; ++i)
578 (*this)[i] = test(i) != RHS.test(i);
579 }
580 return *this;
581 }
582
583 SmallBitVector &operator<<=(unsigned N) {
584 if (isSmall())
585 setSmallBits(getSmallBits() << N);
586 else
587 getPointer()->operator<<=(N);
588 return *this;
589 }
590
591 SmallBitVector &operator>>=(unsigned N) {
592 if (isSmall())
593 setSmallBits(getSmallBits() >> N);
594 else
595 getPointer()->operator>>=(N);
596 return *this;
597 }
598
599 // Assignment operator.
600 const SmallBitVector &operator=(const SmallBitVector &RHS) {
601 if (isSmall()) {
602 if (RHS.isSmall())
603 X = RHS.X;
604 else
605 switchToLarge(new BitVector(*RHS.getPointer()));
606 } else {
607 if (!RHS.isSmall())
608 *getPointer() = *RHS.getPointer();
609 else {
610 delete getPointer();
611 X = RHS.X;
612 }
613 }
614 return *this;
615 }
616
617 const SmallBitVector &operator=(SmallBitVector &&RHS) {
618 if (this != &RHS) {
619 clear();
620 swap(RHS);
621 }
622 return *this;
623 }
624
625 void swap(SmallBitVector &RHS) {
626 std::swap(X, RHS.X);
627 }
628
629 /// Add '1' bits from Mask to this vector. Don't resize.
630 /// This computes "*this |= Mask".
631 void setBitsInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) {
632 if (isSmall())
633 applyMask<true, false>(Mask, MaskWords);
634 else
635 getPointer()->setBitsInMask(Mask, MaskWords);
636 }
637
638 /// Clear any bits in this vector that are set in Mask. Don't resize.
639 /// This computes "*this &= ~Mask".
640 void clearBitsInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) {
641 if (isSmall())
642 applyMask<false, false>(Mask, MaskWords);
643 else
644 getPointer()->clearBitsInMask(Mask, MaskWords);
645 }
646
647 /// Add a bit to this vector for every '0' bit in Mask. Don't resize.
648 /// This computes "*this |= ~Mask".
649 void setBitsNotInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) {
650 if (isSmall())
651 applyMask<true, true>(Mask, MaskWords);
652 else
653 getPointer()->setBitsNotInMask(Mask, MaskWords);
654 }
655
656 /// Clear a bit in this vector for every '0' bit in Mask. Don't resize.
657 /// This computes "*this &= Mask".
658 void clearBitsNotInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) {
659 if (isSmall())
660 applyMask<false, true>(Mask, MaskWords);
661 else
662 getPointer()->clearBitsNotInMask(Mask, MaskWords);
663 }
664
665private:
666 template <bool AddBits, bool InvertMask>
667 void applyMask(const uint32_t *Mask, unsigned MaskWords) {
668 assert(MaskWords <= sizeof(uintptr_t) && "Mask is larger than base!")((MaskWords <= sizeof(uintptr_t) && "Mask is larger than base!"
) ? static_cast<void> (0) : __assert_fail ("MaskWords <= sizeof(uintptr_t) && \"Mask is larger than base!\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h"
, 668, __PRETTY_FUNCTION__));
669 uintptr_t M = Mask[0];
670 if (NumBaseBits == 64)
671 M |= uint64_t(Mask[1]) << 32;
672 if (InvertMask)
673 M = ~M;
674 if (AddBits)
675 setSmallBits(getSmallBits() | M);
676 else
677 setSmallBits(getSmallBits() & ~M);
678 }
679};
680
681inline SmallBitVector
682operator&(const SmallBitVector &LHS, const SmallBitVector &RHS) {
683 SmallBitVector Result(LHS);
684 Result &= RHS;
685 return Result;
686}
687
688inline SmallBitVector
689operator|(const SmallBitVector &LHS, const SmallBitVector &RHS) {
690 SmallBitVector Result(LHS);
691 Result |= RHS;
692 return Result;
693}
694
695inline SmallBitVector
696operator^(const SmallBitVector &LHS, const SmallBitVector &RHS) {
697 SmallBitVector Result(LHS);
698 Result ^= RHS;
699 return Result;
700}
701
702} // end namespace llvm
703
704namespace std {
705
706/// Implement std::swap in terms of BitVector swap.
707inline void
708swap(llvm::SmallBitVector &LHS, llvm::SmallBitVector &RHS) {
709 LHS.swap(RHS);
710}
711
712} // end namespace std
713
714#endif // LLVM_ADT_SMALLBITVECTOR_H