Bug Summary

File:clang/lib/Lex/LiteralSupport.cpp
Warning:line 720, column 11
Value stored to 'HasSize' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name LiteralSupport.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 -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/build-llvm/tools/clang/lib/Lex -resource-dir /usr/lib/llvm-13/lib/clang/13.0.0 -D CLANG_ROUND_TRIP_CC1_ARGS=ON -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/build-llvm/tools/clang/lib/Lex -I /build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex -I /build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/include -I /build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/build-llvm/include -I /build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/llvm/include -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-13/lib/clang/13.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/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-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/build-llvm/tools/clang/lib/Lex -fdebug-prefix-map=/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2021-06-21-164211-33944-1 -x c++ /build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp
1//===--- LiteralSupport.cpp - Code to parse and process literals ----------===//
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 NumericLiteralParser, CharLiteralParser, and
10// StringLiteralParser interfaces.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Lex/LiteralSupport.h"
15#include "clang/Basic/CharInfo.h"
16#include "clang/Basic/LangOptions.h"
17#include "clang/Basic/SourceLocation.h"
18#include "clang/Basic/TargetInfo.h"
19#include "clang/Lex/LexDiagnostic.h"
20#include "clang/Lex/Lexer.h"
21#include "clang/Lex/Preprocessor.h"
22#include "clang/Lex/Token.h"
23#include "llvm/ADT/APInt.h"
24#include "llvm/ADT/SmallVector.h"
25#include "llvm/ADT/StringExtras.h"
26#include "llvm/ADT/StringSwitch.h"
27#include "llvm/Support/ConvertUTF.h"
28#include "llvm/Support/Error.h"
29#include "llvm/Support/ErrorHandling.h"
30#include <algorithm>
31#include <cassert>
32#include <cstddef>
33#include <cstdint>
34#include <cstring>
35#include <string>
36
37using namespace clang;
38
39static unsigned getCharWidth(tok::TokenKind kind, const TargetInfo &Target) {
40 switch (kind) {
41 default: llvm_unreachable("Unknown token type!")::llvm::llvm_unreachable_internal("Unknown token type!", "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 41)
;
42 case tok::char_constant:
43 case tok::string_literal:
44 case tok::utf8_char_constant:
45 case tok::utf8_string_literal:
46 return Target.getCharWidth();
47 case tok::wide_char_constant:
48 case tok::wide_string_literal:
49 return Target.getWCharWidth();
50 case tok::utf16_char_constant:
51 case tok::utf16_string_literal:
52 return Target.getChar16Width();
53 case tok::utf32_char_constant:
54 case tok::utf32_string_literal:
55 return Target.getChar32Width();
56 }
57}
58
59static CharSourceRange MakeCharSourceRange(const LangOptions &Features,
60 FullSourceLoc TokLoc,
61 const char *TokBegin,
62 const char *TokRangeBegin,
63 const char *TokRangeEnd) {
64 SourceLocation Begin =
65 Lexer::AdvanceToTokenCharacter(TokLoc, TokRangeBegin - TokBegin,
66 TokLoc.getManager(), Features);
67 SourceLocation End =
68 Lexer::AdvanceToTokenCharacter(Begin, TokRangeEnd - TokRangeBegin,
69 TokLoc.getManager(), Features);
70 return CharSourceRange::getCharRange(Begin, End);
71}
72
73/// Produce a diagnostic highlighting some portion of a literal.
74///
75/// Emits the diagnostic \p DiagID, highlighting the range of characters from
76/// \p TokRangeBegin (inclusive) to \p TokRangeEnd (exclusive), which must be
77/// a substring of a spelling buffer for the token beginning at \p TokBegin.
78static DiagnosticBuilder Diag(DiagnosticsEngine *Diags,
79 const LangOptions &Features, FullSourceLoc TokLoc,
80 const char *TokBegin, const char *TokRangeBegin,
81 const char *TokRangeEnd, unsigned DiagID) {
82 SourceLocation Begin =
83 Lexer::AdvanceToTokenCharacter(TokLoc, TokRangeBegin - TokBegin,
84 TokLoc.getManager(), Features);
85 return Diags->Report(Begin, DiagID) <<
86 MakeCharSourceRange(Features, TokLoc, TokBegin, TokRangeBegin, TokRangeEnd);
87}
88
89/// ProcessCharEscape - Parse a standard C escape sequence, which can occur in
90/// either a character or a string literal.
91static unsigned ProcessCharEscape(const char *ThisTokBegin,
92 const char *&ThisTokBuf,
93 const char *ThisTokEnd, bool &HadError,
94 FullSourceLoc Loc, unsigned CharWidth,
95 DiagnosticsEngine *Diags,
96 const LangOptions &Features) {
97 const char *EscapeBegin = ThisTokBuf;
98
99 // Skip the '\' char.
100 ++ThisTokBuf;
101
102 // We know that this character can't be off the end of the buffer, because
103 // that would have been \", which would not have been the end of string.
104 unsigned ResultChar = *ThisTokBuf++;
105 switch (ResultChar) {
106 // These map to themselves.
107 case '\\': case '\'': case '"': case '?': break;
108
109 // These have fixed mappings.
110 case 'a':
111 // TODO: K&R: the meaning of '\\a' is different in traditional C
112 ResultChar = 7;
113 break;
114 case 'b':
115 ResultChar = 8;
116 break;
117 case 'e':
118 if (Diags)
119 Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf,
120 diag::ext_nonstandard_escape) << "e";
121 ResultChar = 27;
122 break;
123 case 'E':
124 if (Diags)
125 Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf,
126 diag::ext_nonstandard_escape) << "E";
127 ResultChar = 27;
128 break;
129 case 'f':
130 ResultChar = 12;
131 break;
132 case 'n':
133 ResultChar = 10;
134 break;
135 case 'r':
136 ResultChar = 13;
137 break;
138 case 't':
139 ResultChar = 9;
140 break;
141 case 'v':
142 ResultChar = 11;
143 break;
144 case 'x': { // Hex escape.
145 ResultChar = 0;
146 if (ThisTokBuf == ThisTokEnd || !isHexDigit(*ThisTokBuf)) {
147 if (Diags)
148 Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf,
149 diag::err_hex_escape_no_digits) << "x";
150 HadError = true;
151 break;
152 }
153
154 // Hex escapes are a maximal series of hex digits.
155 bool Overflow = false;
156 for (; ThisTokBuf != ThisTokEnd; ++ThisTokBuf) {
157 int CharVal = llvm::hexDigitValue(ThisTokBuf[0]);
158 if (CharVal == -1) break;
159 // About to shift out a digit?
160 if (ResultChar & 0xF0000000)
161 Overflow = true;
162 ResultChar <<= 4;
163 ResultChar |= CharVal;
164 }
165
166 // See if any bits will be truncated when evaluated as a character.
167 if (CharWidth != 32 && (ResultChar >> CharWidth) != 0) {
168 Overflow = true;
169 ResultChar &= ~0U >> (32-CharWidth);
170 }
171
172 // Check for overflow.
173 if (Overflow && Diags) // Too many digits to fit in
174 Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf,
175 diag::err_escape_too_large) << 0;
176 break;
177 }
178 case '0': case '1': case '2': case '3':
179 case '4': case '5': case '6': case '7': {
180 // Octal escapes.
181 --ThisTokBuf;
182 ResultChar = 0;
183
184 // Octal escapes are a series of octal digits with maximum length 3.
185 // "\0123" is a two digit sequence equal to "\012" "3".
186 unsigned NumDigits = 0;
187 do {
188 ResultChar <<= 3;
189 ResultChar |= *ThisTokBuf++ - '0';
190 ++NumDigits;
191 } while (ThisTokBuf != ThisTokEnd && NumDigits < 3 &&
192 ThisTokBuf[0] >= '0' && ThisTokBuf[0] <= '7');
193
194 // Check for overflow. Reject '\777', but not L'\777'.
195 if (CharWidth != 32 && (ResultChar >> CharWidth) != 0) {
196 if (Diags)
197 Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf,
198 diag::err_escape_too_large) << 1;
199 ResultChar &= ~0U >> (32-CharWidth);
200 }
201 break;
202 }
203
204 // Otherwise, these are not valid escapes.
205 case '(': case '{': case '[': case '%':
206 // GCC accepts these as extensions. We warn about them as such though.
207 if (Diags)
208 Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf,
209 diag::ext_nonstandard_escape)
210 << std::string(1, ResultChar);
211 break;
212 default:
213 if (!Diags)
214 break;
215
216 if (isPrintable(ResultChar))
217 Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf,
218 diag::ext_unknown_escape)
219 << std::string(1, ResultChar);
220 else
221 Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf,
222 diag::ext_unknown_escape)
223 << "x" + llvm::utohexstr(ResultChar);
224 break;
225 }
226
227 return ResultChar;
228}
229
230static void appendCodePoint(unsigned Codepoint,
231 llvm::SmallVectorImpl<char> &Str) {
232 char ResultBuf[4];
233 char *ResultPtr = ResultBuf;
234 bool Res = llvm::ConvertCodePointToUTF8(Codepoint, ResultPtr);
235 (void)Res;
236 assert(Res && "Unexpected conversion failure")(static_cast <bool> (Res && "Unexpected conversion failure"
) ? void (0) : __assert_fail ("Res && \"Unexpected conversion failure\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 236, __extension__ __PRETTY_FUNCTION__))
;
237 Str.append(ResultBuf, ResultPtr);
238}
239
240void clang::expandUCNs(SmallVectorImpl<char> &Buf, StringRef Input) {
241 for (StringRef::iterator I = Input.begin(), E = Input.end(); I != E; ++I) {
242 if (*I != '\\') {
243 Buf.push_back(*I);
244 continue;
245 }
246
247 ++I;
248 assert(*I == 'u' || *I == 'U')(static_cast <bool> (*I == 'u' || *I == 'U') ? void (0)
: __assert_fail ("*I == 'u' || *I == 'U'", "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 248, __extension__ __PRETTY_FUNCTION__))
;
249
250 unsigned NumHexDigits;
251 if (*I == 'u')
252 NumHexDigits = 4;
253 else
254 NumHexDigits = 8;
255
256 assert(I + NumHexDigits <= E)(static_cast <bool> (I + NumHexDigits <= E) ? void (
0) : __assert_fail ("I + NumHexDigits <= E", "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 256, __extension__ __PRETTY_FUNCTION__))
;
257
258 uint32_t CodePoint = 0;
259 for (++I; NumHexDigits != 0; ++I, --NumHexDigits) {
260 unsigned Value = llvm::hexDigitValue(*I);
261 assert(Value != -1U)(static_cast <bool> (Value != -1U) ? void (0) : __assert_fail
("Value != -1U", "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 261, __extension__ __PRETTY_FUNCTION__))
;
262
263 CodePoint <<= 4;
264 CodePoint += Value;
265 }
266
267 appendCodePoint(CodePoint, Buf);
268 --I;
269 }
270}
271
272/// ProcessUCNEscape - Read the Universal Character Name, check constraints and
273/// return the UTF32.
274static bool ProcessUCNEscape(const char *ThisTokBegin, const char *&ThisTokBuf,
275 const char *ThisTokEnd,
276 uint32_t &UcnVal, unsigned short &UcnLen,
277 FullSourceLoc Loc, DiagnosticsEngine *Diags,
278 const LangOptions &Features,
279 bool in_char_string_literal = false) {
280 const char *UcnBegin = ThisTokBuf;
281
282 // Skip the '\u' char's.
283 ThisTokBuf += 2;
284
285 if (ThisTokBuf == ThisTokEnd || !isHexDigit(*ThisTokBuf)) {
286 if (Diags)
287 Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf,
288 diag::err_hex_escape_no_digits) << StringRef(&ThisTokBuf[-1], 1);
289 return false;
290 }
291 UcnLen = (ThisTokBuf[-1] == 'u' ? 4 : 8);
292 unsigned short UcnLenSave = UcnLen;
293 for (; ThisTokBuf != ThisTokEnd && UcnLenSave; ++ThisTokBuf, UcnLenSave--) {
294 int CharVal = llvm::hexDigitValue(ThisTokBuf[0]);
295 if (CharVal == -1) break;
296 UcnVal <<= 4;
297 UcnVal |= CharVal;
298 }
299 // If we didn't consume the proper number of digits, there is a problem.
300 if (UcnLenSave) {
301 if (Diags)
302 Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf,
303 diag::err_ucn_escape_incomplete);
304 return false;
305 }
306
307 // Check UCN constraints (C99 6.4.3p2) [C++11 lex.charset p2]
308 if ((0xD800 <= UcnVal && UcnVal <= 0xDFFF) || // surrogate codepoints
309 UcnVal > 0x10FFFF) { // maximum legal UTF32 value
310 if (Diags)
311 Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf,
312 diag::err_ucn_escape_invalid);
313 return false;
314 }
315
316 // C++11 allows UCNs that refer to control characters and basic source
317 // characters inside character and string literals
318 if (UcnVal < 0xa0 &&
319 (UcnVal != 0x24 && UcnVal != 0x40 && UcnVal != 0x60)) { // $, @, `
320 bool IsError = (!Features.CPlusPlus11 || !in_char_string_literal);
321 if (Diags) {
322 char BasicSCSChar = UcnVal;
323 if (UcnVal >= 0x20 && UcnVal < 0x7f)
324 Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf,
325 IsError ? diag::err_ucn_escape_basic_scs :
326 diag::warn_cxx98_compat_literal_ucn_escape_basic_scs)
327 << StringRef(&BasicSCSChar, 1);
328 else
329 Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf,
330 IsError ? diag::err_ucn_control_character :
331 diag::warn_cxx98_compat_literal_ucn_control_character);
332 }
333 if (IsError)
334 return false;
335 }
336
337 if (!Features.CPlusPlus && !Features.C99 && Diags)
338 Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf,
339 diag::warn_ucn_not_valid_in_c89_literal);
340
341 return true;
342}
343
344/// MeasureUCNEscape - Determine the number of bytes within the resulting string
345/// which this UCN will occupy.
346static int MeasureUCNEscape(const char *ThisTokBegin, const char *&ThisTokBuf,
347 const char *ThisTokEnd, unsigned CharByteWidth,
348 const LangOptions &Features, bool &HadError) {
349 // UTF-32: 4 bytes per escape.
350 if (CharByteWidth == 4)
351 return 4;
352
353 uint32_t UcnVal = 0;
354 unsigned short UcnLen = 0;
355 FullSourceLoc Loc;
356
357 if (!ProcessUCNEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd, UcnVal,
358 UcnLen, Loc, nullptr, Features, true)) {
359 HadError = true;
360 return 0;
361 }
362
363 // UTF-16: 2 bytes for BMP, 4 bytes otherwise.
364 if (CharByteWidth == 2)
365 return UcnVal <= 0xFFFF ? 2 : 4;
366
367 // UTF-8.
368 if (UcnVal < 0x80)
369 return 1;
370 if (UcnVal < 0x800)
371 return 2;
372 if (UcnVal < 0x10000)
373 return 3;
374 return 4;
375}
376
377/// EncodeUCNEscape - Read the Universal Character Name, check constraints and
378/// convert the UTF32 to UTF8 or UTF16. This is a subroutine of
379/// StringLiteralParser. When we decide to implement UCN's for identifiers,
380/// we will likely rework our support for UCN's.
381static void EncodeUCNEscape(const char *ThisTokBegin, const char *&ThisTokBuf,
382 const char *ThisTokEnd,
383 char *&ResultBuf, bool &HadError,
384 FullSourceLoc Loc, unsigned CharByteWidth,
385 DiagnosticsEngine *Diags,
386 const LangOptions &Features) {
387 typedef uint32_t UTF32;
388 UTF32 UcnVal = 0;
389 unsigned short UcnLen = 0;
390 if (!ProcessUCNEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd, UcnVal, UcnLen,
391 Loc, Diags, Features, true)) {
392 HadError = true;
393 return;
394 }
395
396 assert((CharByteWidth == 1 || CharByteWidth == 2 || CharByteWidth == 4) &&(static_cast <bool> ((CharByteWidth == 1 || CharByteWidth
== 2 || CharByteWidth == 4) && "only character widths of 1, 2, or 4 bytes supported"
) ? void (0) : __assert_fail ("(CharByteWidth == 1 || CharByteWidth == 2 || CharByteWidth == 4) && \"only character widths of 1, 2, or 4 bytes supported\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 397, __extension__ __PRETTY_FUNCTION__))
397 "only character widths of 1, 2, or 4 bytes supported")(static_cast <bool> ((CharByteWidth == 1 || CharByteWidth
== 2 || CharByteWidth == 4) && "only character widths of 1, 2, or 4 bytes supported"
) ? void (0) : __assert_fail ("(CharByteWidth == 1 || CharByteWidth == 2 || CharByteWidth == 4) && \"only character widths of 1, 2, or 4 bytes supported\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 397, __extension__ __PRETTY_FUNCTION__))
;
398
399 (void)UcnLen;
400 assert((UcnLen== 4 || UcnLen== 8) && "only ucn length of 4 or 8 supported")(static_cast <bool> ((UcnLen== 4 || UcnLen== 8) &&
"only ucn length of 4 or 8 supported") ? void (0) : __assert_fail
("(UcnLen== 4 || UcnLen== 8) && \"only ucn length of 4 or 8 supported\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 400, __extension__ __PRETTY_FUNCTION__))
;
401
402 if (CharByteWidth == 4) {
403 // FIXME: Make the type of the result buffer correct instead of
404 // using reinterpret_cast.
405 llvm::UTF32 *ResultPtr = reinterpret_cast<llvm::UTF32*>(ResultBuf);
406 *ResultPtr = UcnVal;
407 ResultBuf += 4;
408 return;
409 }
410
411 if (CharByteWidth == 2) {
412 // FIXME: Make the type of the result buffer correct instead of
413 // using reinterpret_cast.
414 llvm::UTF16 *ResultPtr = reinterpret_cast<llvm::UTF16*>(ResultBuf);
415
416 if (UcnVal <= (UTF32)0xFFFF) {
417 *ResultPtr = UcnVal;
418 ResultBuf += 2;
419 return;
420 }
421
422 // Convert to UTF16.
423 UcnVal -= 0x10000;
424 *ResultPtr = 0xD800 + (UcnVal >> 10);
425 *(ResultPtr+1) = 0xDC00 + (UcnVal & 0x3FF);
426 ResultBuf += 4;
427 return;
428 }
429
430 assert(CharByteWidth == 1 && "UTF-8 encoding is only for 1 byte characters")(static_cast <bool> (CharByteWidth == 1 && "UTF-8 encoding is only for 1 byte characters"
) ? void (0) : __assert_fail ("CharByteWidth == 1 && \"UTF-8 encoding is only for 1 byte characters\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 430, __extension__ __PRETTY_FUNCTION__))
;
431
432 // Now that we've parsed/checked the UCN, we convert from UTF32->UTF8.
433 // The conversion below was inspired by:
434 // http://www.unicode.org/Public/PROGRAMS/CVTUTF/ConvertUTF.c
435 // First, we determine how many bytes the result will require.
436 typedef uint8_t UTF8;
437
438 unsigned short bytesToWrite = 0;
439 if (UcnVal < (UTF32)0x80)
440 bytesToWrite = 1;
441 else if (UcnVal < (UTF32)0x800)
442 bytesToWrite = 2;
443 else if (UcnVal < (UTF32)0x10000)
444 bytesToWrite = 3;
445 else
446 bytesToWrite = 4;
447
448 const unsigned byteMask = 0xBF;
449 const unsigned byteMark = 0x80;
450
451 // Once the bits are split out into bytes of UTF8, this is a mask OR-ed
452 // into the first byte, depending on how many bytes follow.
453 static const UTF8 firstByteMark[5] = {
454 0x00, 0x00, 0xC0, 0xE0, 0xF0
455 };
456 // Finally, we write the bytes into ResultBuf.
457 ResultBuf += bytesToWrite;
458 switch (bytesToWrite) { // note: everything falls through.
459 case 4:
460 *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6;
461 LLVM_FALLTHROUGH[[gnu::fallthrough]];
462 case 3:
463 *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6;
464 LLVM_FALLTHROUGH[[gnu::fallthrough]];
465 case 2:
466 *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6;
467 LLVM_FALLTHROUGH[[gnu::fallthrough]];
468 case 1:
469 *--ResultBuf = (UTF8) (UcnVal | firstByteMark[bytesToWrite]);
470 }
471 // Update the buffer.
472 ResultBuf += bytesToWrite;
473}
474
475/// integer-constant: [C99 6.4.4.1]
476/// decimal-constant integer-suffix
477/// octal-constant integer-suffix
478/// hexadecimal-constant integer-suffix
479/// binary-literal integer-suffix [GNU, C++1y]
480/// user-defined-integer-literal: [C++11 lex.ext]
481/// decimal-literal ud-suffix
482/// octal-literal ud-suffix
483/// hexadecimal-literal ud-suffix
484/// binary-literal ud-suffix [GNU, C++1y]
485/// decimal-constant:
486/// nonzero-digit
487/// decimal-constant digit
488/// octal-constant:
489/// 0
490/// octal-constant octal-digit
491/// hexadecimal-constant:
492/// hexadecimal-prefix hexadecimal-digit
493/// hexadecimal-constant hexadecimal-digit
494/// hexadecimal-prefix: one of
495/// 0x 0X
496/// binary-literal:
497/// 0b binary-digit
498/// 0B binary-digit
499/// binary-literal binary-digit
500/// integer-suffix:
501/// unsigned-suffix [long-suffix]
502/// unsigned-suffix [long-long-suffix]
503/// long-suffix [unsigned-suffix]
504/// long-long-suffix [unsigned-sufix]
505/// nonzero-digit:
506/// 1 2 3 4 5 6 7 8 9
507/// octal-digit:
508/// 0 1 2 3 4 5 6 7
509/// hexadecimal-digit:
510/// 0 1 2 3 4 5 6 7 8 9
511/// a b c d e f
512/// A B C D E F
513/// binary-digit:
514/// 0
515/// 1
516/// unsigned-suffix: one of
517/// u U
518/// long-suffix: one of
519/// l L
520/// long-long-suffix: one of
521/// ll LL
522///
523/// floating-constant: [C99 6.4.4.2]
524/// TODO: add rules...
525///
526NumericLiteralParser::NumericLiteralParser(StringRef TokSpelling,
527 SourceLocation TokLoc,
528 const SourceManager &SM,
529 const LangOptions &LangOpts,
530 const TargetInfo &Target,
531 DiagnosticsEngine &Diags)
532 : SM(SM), LangOpts(LangOpts), Diags(Diags),
533 ThisTokBegin(TokSpelling.begin()), ThisTokEnd(TokSpelling.end()) {
534
535 // This routine assumes that the range begin/end matches the regex for integer
536 // and FP constants (specifically, the 'pp-number' regex), and assumes that
537 // the byte at "*end" is both valid and not part of the regex. Because of
538 // this, it doesn't have to check for 'overscan' in various places.
539 assert(!isPreprocessingNumberBody(*ThisTokEnd) && "didn't maximally munch?")(static_cast <bool> (!isPreprocessingNumberBody(*ThisTokEnd
) && "didn't maximally munch?") ? void (0) : __assert_fail
("!isPreprocessingNumberBody(*ThisTokEnd) && \"didn't maximally munch?\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 539, __extension__ __PRETTY_FUNCTION__))
;
540
541 s = DigitsBegin = ThisTokBegin;
542 saw_exponent = false;
543 saw_period = false;
544 saw_ud_suffix = false;
545 saw_fixed_point_suffix = false;
546 isLong = false;
547 isUnsigned = false;
548 isLongLong = false;
549 isSizeT = false;
550 isHalf = false;
551 isFloat = false;
552 isImaginary = false;
553 isFloat16 = false;
554 isFloat128 = false;
555 MicrosoftInteger = 0;
556 isFract = false;
557 isAccum = false;
558 hadError = false;
559
560 if (*s == '0') { // parse radix
561 ParseNumberStartingWithZero(TokLoc);
562 if (hadError)
563 return;
564 } else { // the first digit is non-zero
565 radix = 10;
566 s = SkipDigits(s);
567 if (s == ThisTokEnd) {
568 // Done.
569 } else {
570 ParseDecimalOrOctalCommon(TokLoc);
571 if (hadError)
572 return;
573 }
574 }
575
576 SuffixBegin = s;
577 checkSeparator(TokLoc, s, CSK_AfterDigits);
578
579 // Initial scan to lookahead for fixed point suffix.
580 if (LangOpts.FixedPoint) {
581 for (const char *c = s; c != ThisTokEnd; ++c) {
582 if (*c == 'r' || *c == 'k' || *c == 'R' || *c == 'K') {
583 saw_fixed_point_suffix = true;
584 break;
585 }
586 }
587 }
588
589 // Parse the suffix. At this point we can classify whether we have an FP or
590 // integer constant.
591 bool isFixedPointConstant = isFixedPointLiteral();
592 bool isFPConstant = isFloatingLiteral();
593 bool HasSize = false;
594
595 // Loop over all of the characters of the suffix. If we see something bad,
596 // we break out of the loop.
597 for (; s != ThisTokEnd; ++s) {
598 switch (*s) {
599 case 'R':
600 case 'r':
601 if (!LangOpts.FixedPoint)
602 break;
603 if (isFract || isAccum) break;
604 if (!(saw_period || saw_exponent)) break;
605 isFract = true;
606 continue;
607 case 'K':
608 case 'k':
609 if (!LangOpts.FixedPoint)
610 break;
611 if (isFract || isAccum) break;
612 if (!(saw_period || saw_exponent)) break;
613 isAccum = true;
614 continue;
615 case 'h': // FP Suffix for "half".
616 case 'H':
617 // OpenCL Extension v1.2 s9.5 - h or H suffix for half type.
618 if (!(LangOpts.Half || LangOpts.FixedPoint))
619 break;
620 if (isIntegerLiteral()) break; // Error for integer constant.
621 if (HasSize)
622 break;
623 HasSize = true;
624 isHalf = true;
625 continue; // Success.
626 case 'f': // FP Suffix for "float"
627 case 'F':
628 if (!isFPConstant) break; // Error for integer constant.
629 if (HasSize)
630 break;
631 HasSize = true;
632
633 // CUDA host and device may have different _Float16 support, therefore
634 // allows f16 literals to avoid false alarm.
635 // ToDo: more precise check for CUDA.
636 if ((Target.hasFloat16Type() || LangOpts.CUDA) && s + 2 < ThisTokEnd &&
637 s[1] == '1' && s[2] == '6') {
638 s += 2; // success, eat up 2 characters.
639 isFloat16 = true;
640 continue;
641 }
642
643 isFloat = true;
644 continue; // Success.
645 case 'q': // FP Suffix for "__float128"
646 case 'Q':
647 if (!isFPConstant) break; // Error for integer constant.
648 if (HasSize)
649 break;
650 HasSize = true;
651 isFloat128 = true;
652 continue; // Success.
653 case 'u':
654 case 'U':
655 if (isFPConstant) break; // Error for floating constant.
656 if (isUnsigned) break; // Cannot be repeated.
657 isUnsigned = true;
658 continue; // Success.
659 case 'l':
660 case 'L':
661 if (HasSize)
662 break;
663 HasSize = true;
664
665 // Check for long long. The L's need to be adjacent and the same case.
666 if (s[1] == s[0]) {
667 assert(s + 1 < ThisTokEnd && "didn't maximally munch?")(static_cast <bool> (s + 1 < ThisTokEnd && "didn't maximally munch?"
) ? void (0) : __assert_fail ("s + 1 < ThisTokEnd && \"didn't maximally munch?\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 667, __extension__ __PRETTY_FUNCTION__))
;
668 if (isFPConstant) break; // long long invalid for floats.
669 isLongLong = true;
670 ++s; // Eat both of them.
671 } else {
672 isLong = true;
673 }
674 continue; // Success.
675 case 'z':
676 case 'Z':
677 if (isFPConstant)
678 break; // Invalid for floats.
679 if (HasSize)
680 break;
681 HasSize = true;
682 isSizeT = true;
683 continue;
684 case 'i':
685 case 'I':
686 if (LangOpts.MicrosoftExt && !isFPConstant) {
687 // Allow i8, i16, i32, and i64. First, look ahead and check if
688 // suffixes are Microsoft integers and not the imaginary unit.
689 uint8_t Bits = 0;
690 size_t ToSkip = 0;
691 switch (s[1]) {
692 case '8': // i8 suffix
693 Bits = 8;
694 ToSkip = 2;
695 break;
696 case '1':
697 if (s[2] == '6') { // i16 suffix
698 Bits = 16;
699 ToSkip = 3;
700 }
701 break;
702 case '3':
703 if (s[2] == '2') { // i32 suffix
704 Bits = 32;
705 ToSkip = 3;
706 }
707 break;
708 case '6':
709 if (s[2] == '4') { // i64 suffix
710 Bits = 64;
711 ToSkip = 3;
712 }
713 break;
714 default:
715 break;
716 }
717 if (Bits) {
718 if (HasSize)
719 break;
720 HasSize = true;
Value stored to 'HasSize' is never read
721 MicrosoftInteger = Bits;
722 s += ToSkip;
723 assert(s <= ThisTokEnd && "didn't maximally munch?")(static_cast <bool> (s <= ThisTokEnd && "didn't maximally munch?"
) ? void (0) : __assert_fail ("s <= ThisTokEnd && \"didn't maximally munch?\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 723, __extension__ __PRETTY_FUNCTION__))
;
724 break;
725 }
726 }
727 LLVM_FALLTHROUGH[[gnu::fallthrough]];
728 case 'j':
729 case 'J':
730 if (isImaginary) break; // Cannot be repeated.
731 isImaginary = true;
732 continue; // Success.
733 }
734 // If we reached here, there was an error or a ud-suffix.
735 break;
736 }
737
738 // "i", "if", and "il" are user-defined suffixes in C++1y.
739 if (s != ThisTokEnd || isImaginary) {
740 // FIXME: Don't bother expanding UCNs if !tok.hasUCN().
741 expandUCNs(UDSuffixBuf, StringRef(SuffixBegin, ThisTokEnd - SuffixBegin));
742 if (isValidUDSuffix(LangOpts, UDSuffixBuf)) {
743 if (!isImaginary) {
744 // Any suffix pieces we might have parsed are actually part of the
745 // ud-suffix.
746 isLong = false;
747 isUnsigned = false;
748 isLongLong = false;
749 isSizeT = false;
750 isFloat = false;
751 isFloat16 = false;
752 isHalf = false;
753 isImaginary = false;
754 MicrosoftInteger = 0;
755 saw_fixed_point_suffix = false;
756 isFract = false;
757 isAccum = false;
758 }
759
760 saw_ud_suffix = true;
761 return;
762 }
763
764 if (s != ThisTokEnd) {
765 // Report an error if there are any.
766 Diags.Report(Lexer::AdvanceToTokenCharacter(
767 TokLoc, SuffixBegin - ThisTokBegin, SM, LangOpts),
768 diag::err_invalid_suffix_constant)
769 << StringRef(SuffixBegin, ThisTokEnd - SuffixBegin)
770 << (isFixedPointConstant ? 2 : isFPConstant);
771 hadError = true;
772 }
773 }
774
775 if (!hadError && saw_fixed_point_suffix) {
776 assert(isFract || isAccum)(static_cast <bool> (isFract || isAccum) ? void (0) : __assert_fail
("isFract || isAccum", "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 776, __extension__ __PRETTY_FUNCTION__))
;
777 }
778}
779
780/// ParseDecimalOrOctalCommon - This method is called for decimal or octal
781/// numbers. It issues an error for illegal digits, and handles floating point
782/// parsing. If it detects a floating point number, the radix is set to 10.
783void NumericLiteralParser::ParseDecimalOrOctalCommon(SourceLocation TokLoc){
784 assert((radix == 8 || radix == 10) && "Unexpected radix")(static_cast <bool> ((radix == 8 || radix == 10) &&
"Unexpected radix") ? void (0) : __assert_fail ("(radix == 8 || radix == 10) && \"Unexpected radix\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 784, __extension__ __PRETTY_FUNCTION__))
;
785
786 // If we have a hex digit other than 'e' (which denotes a FP exponent) then
787 // the code is using an incorrect base.
788 if (isHexDigit(*s) && *s != 'e' && *s != 'E' &&
789 !isValidUDSuffix(LangOpts, StringRef(s, ThisTokEnd - s))) {
790 Diags.Report(
791 Lexer::AdvanceToTokenCharacter(TokLoc, s - ThisTokBegin, SM, LangOpts),
792 diag::err_invalid_digit)
793 << StringRef(s, 1) << (radix == 8 ? 1 : 0);
794 hadError = true;
795 return;
796 }
797
798 if (*s == '.') {
799 checkSeparator(TokLoc, s, CSK_AfterDigits);
800 s++;
801 radix = 10;
802 saw_period = true;
803 checkSeparator(TokLoc, s, CSK_BeforeDigits);
804 s = SkipDigits(s); // Skip suffix.
805 }
806 if (*s == 'e' || *s == 'E') { // exponent
807 checkSeparator(TokLoc, s, CSK_AfterDigits);
808 const char *Exponent = s;
809 s++;
810 radix = 10;
811 saw_exponent = true;
812 if (s != ThisTokEnd && (*s == '+' || *s == '-')) s++; // sign
813 const char *first_non_digit = SkipDigits(s);
814 if (containsDigits(s, first_non_digit)) {
815 checkSeparator(TokLoc, s, CSK_BeforeDigits);
816 s = first_non_digit;
817 } else {
818 if (!hadError) {
819 Diags.Report(Lexer::AdvanceToTokenCharacter(
820 TokLoc, Exponent - ThisTokBegin, SM, LangOpts),
821 diag::err_exponent_has_no_digits);
822 hadError = true;
823 }
824 return;
825 }
826 }
827}
828
829/// Determine whether a suffix is a valid ud-suffix. We avoid treating reserved
830/// suffixes as ud-suffixes, because the diagnostic experience is better if we
831/// treat it as an invalid suffix.
832bool NumericLiteralParser::isValidUDSuffix(const LangOptions &LangOpts,
833 StringRef Suffix) {
834 if (!LangOpts.CPlusPlus11 || Suffix.empty())
835 return false;
836
837 // By C++11 [lex.ext]p10, ud-suffixes starting with an '_' are always valid.
838 if (Suffix[0] == '_')
839 return true;
840
841 // In C++11, there are no library suffixes.
842 if (!LangOpts.CPlusPlus14)
843 return false;
844
845 // In C++14, "s", "h", "min", "ms", "us", and "ns" are used in the library.
846 // Per tweaked N3660, "il", "i", and "if" are also used in the library.
847 // In C++2a "d" and "y" are used in the library.
848 return llvm::StringSwitch<bool>(Suffix)
849 .Cases("h", "min", "s", true)
850 .Cases("ms", "us", "ns", true)
851 .Cases("il", "i", "if", true)
852 .Cases("d", "y", LangOpts.CPlusPlus20)
853 .Default(false);
854}
855
856void NumericLiteralParser::checkSeparator(SourceLocation TokLoc,
857 const char *Pos,
858 CheckSeparatorKind IsAfterDigits) {
859 if (IsAfterDigits == CSK_AfterDigits) {
860 if (Pos == ThisTokBegin)
861 return;
862 --Pos;
863 } else if (Pos == ThisTokEnd)
864 return;
865
866 if (isDigitSeparator(*Pos)) {
867 Diags.Report(Lexer::AdvanceToTokenCharacter(TokLoc, Pos - ThisTokBegin, SM,
868 LangOpts),
869 diag::err_digit_separator_not_between_digits)
870 << IsAfterDigits;
871 hadError = true;
872 }
873}
874
875/// ParseNumberStartingWithZero - This method is called when the first character
876/// of the number is found to be a zero. This means it is either an octal
877/// number (like '04') or a hex number ('0x123a') a binary number ('0b1010') or
878/// a floating point number (01239.123e4). Eat the prefix, determining the
879/// radix etc.
880void NumericLiteralParser::ParseNumberStartingWithZero(SourceLocation TokLoc) {
881 assert(s[0] == '0' && "Invalid method call")(static_cast <bool> (s[0] == '0' && "Invalid method call"
) ? void (0) : __assert_fail ("s[0] == '0' && \"Invalid method call\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 881, __extension__ __PRETTY_FUNCTION__))
;
882 s++;
883
884 int c1 = s[0];
885
886 // Handle a hex number like 0x1234.
887 if ((c1 == 'x' || c1 == 'X') && (isHexDigit(s[1]) || s[1] == '.')) {
888 s++;
889 assert(s < ThisTokEnd && "didn't maximally munch?")(static_cast <bool> (s < ThisTokEnd && "didn't maximally munch?"
) ? void (0) : __assert_fail ("s < ThisTokEnd && \"didn't maximally munch?\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 889, __extension__ __PRETTY_FUNCTION__))
;
890 radix = 16;
891 DigitsBegin = s;
892 s = SkipHexDigits(s);
893 bool HasSignificandDigits = containsDigits(DigitsBegin, s);
894 if (s == ThisTokEnd) {
895 // Done.
896 } else if (*s == '.') {
897 s++;
898 saw_period = true;
899 const char *floatDigitsBegin = s;
900 s = SkipHexDigits(s);
901 if (containsDigits(floatDigitsBegin, s))
902 HasSignificandDigits = true;
903 if (HasSignificandDigits)
904 checkSeparator(TokLoc, floatDigitsBegin, CSK_BeforeDigits);
905 }
906
907 if (!HasSignificandDigits) {
908 Diags.Report(Lexer::AdvanceToTokenCharacter(TokLoc, s - ThisTokBegin, SM,
909 LangOpts),
910 diag::err_hex_constant_requires)
911 << LangOpts.CPlusPlus << 1;
912 hadError = true;
913 return;
914 }
915
916 // A binary exponent can appear with or with a '.'. If dotted, the
917 // binary exponent is required.
918 if (*s == 'p' || *s == 'P') {
919 checkSeparator(TokLoc, s, CSK_AfterDigits);
920 const char *Exponent = s;
921 s++;
922 saw_exponent = true;
923 if (s != ThisTokEnd && (*s == '+' || *s == '-')) s++; // sign
924 const char *first_non_digit = SkipDigits(s);
925 if (!containsDigits(s, first_non_digit)) {
926 if (!hadError) {
927 Diags.Report(Lexer::AdvanceToTokenCharacter(
928 TokLoc, Exponent - ThisTokBegin, SM, LangOpts),
929 diag::err_exponent_has_no_digits);
930 hadError = true;
931 }
932 return;
933 }
934 checkSeparator(TokLoc, s, CSK_BeforeDigits);
935 s = first_non_digit;
936
937 if (!LangOpts.HexFloats)
938 Diags.Report(TokLoc, LangOpts.CPlusPlus
939 ? diag::ext_hex_literal_invalid
940 : diag::ext_hex_constant_invalid);
941 else if (LangOpts.CPlusPlus17)
942 Diags.Report(TokLoc, diag::warn_cxx17_hex_literal);
943 } else if (saw_period) {
944 Diags.Report(Lexer::AdvanceToTokenCharacter(TokLoc, s - ThisTokBegin, SM,
945 LangOpts),
946 diag::err_hex_constant_requires)
947 << LangOpts.CPlusPlus << 0;
948 hadError = true;
949 }
950 return;
951 }
952
953 // Handle simple binary numbers 0b01010
954 if ((c1 == 'b' || c1 == 'B') && (s[1] == '0' || s[1] == '1')) {
955 // 0b101010 is a C++1y / GCC extension.
956 Diags.Report(TokLoc, LangOpts.CPlusPlus14
957 ? diag::warn_cxx11_compat_binary_literal
958 : LangOpts.CPlusPlus ? diag::ext_binary_literal_cxx14
959 : diag::ext_binary_literal);
960 ++s;
961 assert(s < ThisTokEnd && "didn't maximally munch?")(static_cast <bool> (s < ThisTokEnd && "didn't maximally munch?"
) ? void (0) : __assert_fail ("s < ThisTokEnd && \"didn't maximally munch?\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 961, __extension__ __PRETTY_FUNCTION__))
;
962 radix = 2;
963 DigitsBegin = s;
964 s = SkipBinaryDigits(s);
965 if (s == ThisTokEnd) {
966 // Done.
967 } else if (isHexDigit(*s) &&
968 !isValidUDSuffix(LangOpts, StringRef(s, ThisTokEnd - s))) {
969 Diags.Report(Lexer::AdvanceToTokenCharacter(TokLoc, s - ThisTokBegin, SM,
970 LangOpts),
971 diag::err_invalid_digit)
972 << StringRef(s, 1) << 2;
973 hadError = true;
974 }
975 // Other suffixes will be diagnosed by the caller.
976 return;
977 }
978
979 // For now, the radix is set to 8. If we discover that we have a
980 // floating point constant, the radix will change to 10. Octal floating
981 // point constants are not permitted (only decimal and hexadecimal).
982 radix = 8;
983 DigitsBegin = s;
984 s = SkipOctalDigits(s);
985 if (s == ThisTokEnd)
986 return; // Done, simple octal number like 01234
987
988 // If we have some other non-octal digit that *is* a decimal digit, see if
989 // this is part of a floating point number like 094.123 or 09e1.
990 if (isDigit(*s)) {
991 const char *EndDecimal = SkipDigits(s);
992 if (EndDecimal[0] == '.' || EndDecimal[0] == 'e' || EndDecimal[0] == 'E') {
993 s = EndDecimal;
994 radix = 10;
995 }
996 }
997
998 ParseDecimalOrOctalCommon(TokLoc);
999}
1000
1001static bool alwaysFitsInto64Bits(unsigned Radix, unsigned NumDigits) {
1002 switch (Radix) {
1003 case 2:
1004 return NumDigits <= 64;
1005 case 8:
1006 return NumDigits <= 64 / 3; // Digits are groups of 3 bits.
1007 case 10:
1008 return NumDigits <= 19; // floor(log10(2^64))
1009 case 16:
1010 return NumDigits <= 64 / 4; // Digits are groups of 4 bits.
1011 default:
1012 llvm_unreachable("impossible Radix")::llvm::llvm_unreachable_internal("impossible Radix", "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1012)
;
1013 }
1014}
1015
1016/// GetIntegerValue - Convert this numeric literal value to an APInt that
1017/// matches Val's input width. If there is an overflow, set Val to the low bits
1018/// of the result and return true. Otherwise, return false.
1019bool NumericLiteralParser::GetIntegerValue(llvm::APInt &Val) {
1020 // Fast path: Compute a conservative bound on the maximum number of
1021 // bits per digit in this radix. If we can't possibly overflow a
1022 // uint64 based on that bound then do the simple conversion to
1023 // integer. This avoids the expensive overflow checking below, and
1024 // handles the common cases that matter (small decimal integers and
1025 // hex/octal values which don't overflow).
1026 const unsigned NumDigits = SuffixBegin - DigitsBegin;
1027 if (alwaysFitsInto64Bits(radix, NumDigits)) {
1028 uint64_t N = 0;
1029 for (const char *Ptr = DigitsBegin; Ptr != SuffixBegin; ++Ptr)
1030 if (!isDigitSeparator(*Ptr))
1031 N = N * radix + llvm::hexDigitValue(*Ptr);
1032
1033 // This will truncate the value to Val's input width. Simply check
1034 // for overflow by comparing.
1035 Val = N;
1036 return Val.getZExtValue() != N;
1037 }
1038
1039 Val = 0;
1040 const char *Ptr = DigitsBegin;
1041
1042 llvm::APInt RadixVal(Val.getBitWidth(), radix);
1043 llvm::APInt CharVal(Val.getBitWidth(), 0);
1044 llvm::APInt OldVal = Val;
1045
1046 bool OverflowOccurred = false;
1047 while (Ptr < SuffixBegin) {
1048 if (isDigitSeparator(*Ptr)) {
1049 ++Ptr;
1050 continue;
1051 }
1052
1053 unsigned C = llvm::hexDigitValue(*Ptr++);
1054
1055 // If this letter is out of bound for this radix, reject it.
1056 assert(C < radix && "NumericLiteralParser ctor should have rejected this")(static_cast <bool> (C < radix && "NumericLiteralParser ctor should have rejected this"
) ? void (0) : __assert_fail ("C < radix && \"NumericLiteralParser ctor should have rejected this\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1056, __extension__ __PRETTY_FUNCTION__))
;
1057
1058 CharVal = C;
1059
1060 // Add the digit to the value in the appropriate radix. If adding in digits
1061 // made the value smaller, then this overflowed.
1062 OldVal = Val;
1063
1064 // Multiply by radix, did overflow occur on the multiply?
1065 Val *= RadixVal;
1066 OverflowOccurred |= Val.udiv(RadixVal) != OldVal;
1067
1068 // Add value, did overflow occur on the value?
1069 // (a + b) ult b <=> overflow
1070 Val += CharVal;
1071 OverflowOccurred |= Val.ult(CharVal);
1072 }
1073 return OverflowOccurred;
1074}
1075
1076llvm::APFloat::opStatus
1077NumericLiteralParser::GetFloatValue(llvm::APFloat &Result) {
1078 using llvm::APFloat;
1079
1080 unsigned n = std::min(SuffixBegin - ThisTokBegin, ThisTokEnd - ThisTokBegin);
1081
1082 llvm::SmallString<16> Buffer;
1083 StringRef Str(ThisTokBegin, n);
1084 if (Str.find('\'') != StringRef::npos) {
1085 Buffer.reserve(n);
1086 std::remove_copy_if(Str.begin(), Str.end(), std::back_inserter(Buffer),
1087 &isDigitSeparator);
1088 Str = Buffer;
1089 }
1090
1091 auto StatusOrErr =
1092 Result.convertFromString(Str, APFloat::rmNearestTiesToEven);
1093 assert(StatusOrErr && "Invalid floating point representation")(static_cast <bool> (StatusOrErr && "Invalid floating point representation"
) ? void (0) : __assert_fail ("StatusOrErr && \"Invalid floating point representation\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1093, __extension__ __PRETTY_FUNCTION__))
;
1094 return !errorToBool(StatusOrErr.takeError()) ? *StatusOrErr
1095 : APFloat::opInvalidOp;
1096}
1097
1098static inline bool IsExponentPart(char c) {
1099 return c == 'p' || c == 'P' || c == 'e' || c == 'E';
1100}
1101
1102bool NumericLiteralParser::GetFixedPointValue(llvm::APInt &StoreVal, unsigned Scale) {
1103 assert(radix == 16 || radix == 10)(static_cast <bool> (radix == 16 || radix == 10) ? void
(0) : __assert_fail ("radix == 16 || radix == 10", "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1103, __extension__ __PRETTY_FUNCTION__))
;
1104
1105 // Find how many digits are needed to store the whole literal.
1106 unsigned NumDigits = SuffixBegin - DigitsBegin;
1107 if (saw_period) --NumDigits;
1108
1109 // Initial scan of the exponent if it exists
1110 bool ExpOverflowOccurred = false;
1111 bool NegativeExponent = false;
1112 const char *ExponentBegin;
1113 uint64_t Exponent = 0;
1114 int64_t BaseShift = 0;
1115 if (saw_exponent) {
1116 const char *Ptr = DigitsBegin;
1117
1118 while (!IsExponentPart(*Ptr)) ++Ptr;
1119 ExponentBegin = Ptr;
1120 ++Ptr;
1121 NegativeExponent = *Ptr == '-';
1122 if (NegativeExponent) ++Ptr;
1123
1124 unsigned NumExpDigits = SuffixBegin - Ptr;
1125 if (alwaysFitsInto64Bits(radix, NumExpDigits)) {
1126 llvm::StringRef ExpStr(Ptr, NumExpDigits);
1127 llvm::APInt ExpInt(/*numBits=*/64, ExpStr, /*radix=*/10);
1128 Exponent = ExpInt.getZExtValue();
1129 } else {
1130 ExpOverflowOccurred = true;
1131 }
1132
1133 if (NegativeExponent) BaseShift -= Exponent;
1134 else BaseShift += Exponent;
1135 }
1136
1137 // Number of bits needed for decimal literal is
1138 // ceil(NumDigits * log2(10)) Integral part
1139 // + Scale Fractional part
1140 // + ceil(Exponent * log2(10)) Exponent
1141 // --------------------------------------------------
1142 // ceil((NumDigits + Exponent) * log2(10)) + Scale
1143 //
1144 // But for simplicity in handling integers, we can round up log2(10) to 4,
1145 // making:
1146 // 4 * (NumDigits + Exponent) + Scale
1147 //
1148 // Number of digits needed for hexadecimal literal is
1149 // 4 * NumDigits Integral part
1150 // + Scale Fractional part
1151 // + Exponent Exponent
1152 // --------------------------------------------------
1153 // (4 * NumDigits) + Scale + Exponent
1154 uint64_t NumBitsNeeded;
1155 if (radix == 10)
1156 NumBitsNeeded = 4 * (NumDigits + Exponent) + Scale;
1157 else
1158 NumBitsNeeded = 4 * NumDigits + Exponent + Scale;
1159
1160 if (NumBitsNeeded > std::numeric_limits<unsigned>::max())
1161 ExpOverflowOccurred = true;
1162 llvm::APInt Val(static_cast<unsigned>(NumBitsNeeded), 0, /*isSigned=*/false);
1163
1164 bool FoundDecimal = false;
1165
1166 int64_t FractBaseShift = 0;
1167 const char *End = saw_exponent ? ExponentBegin : SuffixBegin;
1168 for (const char *Ptr = DigitsBegin; Ptr < End; ++Ptr) {
1169 if (*Ptr == '.') {
1170 FoundDecimal = true;
1171 continue;
1172 }
1173
1174 // Normal reading of an integer
1175 unsigned C = llvm::hexDigitValue(*Ptr);
1176 assert(C < radix && "NumericLiteralParser ctor should have rejected this")(static_cast <bool> (C < radix && "NumericLiteralParser ctor should have rejected this"
) ? void (0) : __assert_fail ("C < radix && \"NumericLiteralParser ctor should have rejected this\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1176, __extension__ __PRETTY_FUNCTION__))
;
1177
1178 Val *= radix;
1179 Val += C;
1180
1181 if (FoundDecimal)
1182 // Keep track of how much we will need to adjust this value by from the
1183 // number of digits past the radix point.
1184 --FractBaseShift;
1185 }
1186
1187 // For a radix of 16, we will be multiplying by 2 instead of 16.
1188 if (radix == 16) FractBaseShift *= 4;
1189 BaseShift += FractBaseShift;
1190
1191 Val <<= Scale;
1192
1193 uint64_t Base = (radix == 16) ? 2 : 10;
1194 if (BaseShift > 0) {
1195 for (int64_t i = 0; i < BaseShift; ++i) {
1196 Val *= Base;
1197 }
1198 } else if (BaseShift < 0) {
1199 for (int64_t i = BaseShift; i < 0 && !Val.isNullValue(); ++i)
1200 Val = Val.udiv(Base);
1201 }
1202
1203 bool IntOverflowOccurred = false;
1204 auto MaxVal = llvm::APInt::getMaxValue(StoreVal.getBitWidth());
1205 if (Val.getBitWidth() > StoreVal.getBitWidth()) {
1206 IntOverflowOccurred |= Val.ugt(MaxVal.zext(Val.getBitWidth()));
1207 StoreVal = Val.trunc(StoreVal.getBitWidth());
1208 } else if (Val.getBitWidth() < StoreVal.getBitWidth()) {
1209 IntOverflowOccurred |= Val.zext(MaxVal.getBitWidth()).ugt(MaxVal);
1210 StoreVal = Val.zext(StoreVal.getBitWidth());
1211 } else {
1212 StoreVal = Val;
1213 }
1214
1215 return IntOverflowOccurred || ExpOverflowOccurred;
1216}
1217
1218/// \verbatim
1219/// user-defined-character-literal: [C++11 lex.ext]
1220/// character-literal ud-suffix
1221/// ud-suffix:
1222/// identifier
1223/// character-literal: [C++11 lex.ccon]
1224/// ' c-char-sequence '
1225/// u' c-char-sequence '
1226/// U' c-char-sequence '
1227/// L' c-char-sequence '
1228/// u8' c-char-sequence ' [C++1z lex.ccon]
1229/// c-char-sequence:
1230/// c-char
1231/// c-char-sequence c-char
1232/// c-char:
1233/// any member of the source character set except the single-quote ',
1234/// backslash \, or new-line character
1235/// escape-sequence
1236/// universal-character-name
1237/// escape-sequence:
1238/// simple-escape-sequence
1239/// octal-escape-sequence
1240/// hexadecimal-escape-sequence
1241/// simple-escape-sequence:
1242/// one of \' \" \? \\ \a \b \f \n \r \t \v
1243/// octal-escape-sequence:
1244/// \ octal-digit
1245/// \ octal-digit octal-digit
1246/// \ octal-digit octal-digit octal-digit
1247/// hexadecimal-escape-sequence:
1248/// \x hexadecimal-digit
1249/// hexadecimal-escape-sequence hexadecimal-digit
1250/// universal-character-name: [C++11 lex.charset]
1251/// \u hex-quad
1252/// \U hex-quad hex-quad
1253/// hex-quad:
1254/// hex-digit hex-digit hex-digit hex-digit
1255/// \endverbatim
1256///
1257CharLiteralParser::CharLiteralParser(const char *begin, const char *end,
1258 SourceLocation Loc, Preprocessor &PP,
1259 tok::TokenKind kind) {
1260 // At this point we know that the character matches the regex "(L|u|U)?'.*'".
1261 HadError = false;
1262
1263 Kind = kind;
1264
1265 const char *TokBegin = begin;
1266
1267 // Skip over wide character determinant.
1268 if (Kind != tok::char_constant)
1269 ++begin;
1270 if (Kind == tok::utf8_char_constant)
1271 ++begin;
1272
1273 // Skip over the entry quote.
1274 assert(begin[0] == '\'' && "Invalid token lexed")(static_cast <bool> (begin[0] == '\'' && "Invalid token lexed"
) ? void (0) : __assert_fail ("begin[0] == '\\'' && \"Invalid token lexed\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1274, __extension__ __PRETTY_FUNCTION__))
;
1275 ++begin;
1276
1277 // Remove an optional ud-suffix.
1278 if (end[-1] != '\'') {
1279 const char *UDSuffixEnd = end;
1280 do {
1281 --end;
1282 } while (end[-1] != '\'');
1283 // FIXME: Don't bother with this if !tok.hasUCN().
1284 expandUCNs(UDSuffixBuf, StringRef(end, UDSuffixEnd - end));
1285 UDSuffixOffset = end - TokBegin;
1286 }
1287
1288 // Trim the ending quote.
1289 assert(end != begin && "Invalid token lexed")(static_cast <bool> (end != begin && "Invalid token lexed"
) ? void (0) : __assert_fail ("end != begin && \"Invalid token lexed\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1289, __extension__ __PRETTY_FUNCTION__))
;
1290 --end;
1291
1292 // FIXME: The "Value" is an uint64_t so we can handle char literals of
1293 // up to 64-bits.
1294 // FIXME: This extensively assumes that 'char' is 8-bits.
1295 assert(PP.getTargetInfo().getCharWidth() == 8 &&(static_cast <bool> (PP.getTargetInfo().getCharWidth() ==
8 && "Assumes char is 8 bits") ? void (0) : __assert_fail
("PP.getTargetInfo().getCharWidth() == 8 && \"Assumes char is 8 bits\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1296, __extension__ __PRETTY_FUNCTION__))
1296 "Assumes char is 8 bits")(static_cast <bool> (PP.getTargetInfo().getCharWidth() ==
8 && "Assumes char is 8 bits") ? void (0) : __assert_fail
("PP.getTargetInfo().getCharWidth() == 8 && \"Assumes char is 8 bits\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1296, __extension__ __PRETTY_FUNCTION__))
;
1297 assert(PP.getTargetInfo().getIntWidth() <= 64 &&(static_cast <bool> (PP.getTargetInfo().getIntWidth() <=
64 && (PP.getTargetInfo().getIntWidth() & 7) == 0
&& "Assumes sizeof(int) on target is <= 64 and a multiple of char"
) ? void (0) : __assert_fail ("PP.getTargetInfo().getIntWidth() <= 64 && (PP.getTargetInfo().getIntWidth() & 7) == 0 && \"Assumes sizeof(int) on target is <= 64 and a multiple of char\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1299, __extension__ __PRETTY_FUNCTION__))
1298 (PP.getTargetInfo().getIntWidth() & 7) == 0 &&(static_cast <bool> (PP.getTargetInfo().getIntWidth() <=
64 && (PP.getTargetInfo().getIntWidth() & 7) == 0
&& "Assumes sizeof(int) on target is <= 64 and a multiple of char"
) ? void (0) : __assert_fail ("PP.getTargetInfo().getIntWidth() <= 64 && (PP.getTargetInfo().getIntWidth() & 7) == 0 && \"Assumes sizeof(int) on target is <= 64 and a multiple of char\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1299, __extension__ __PRETTY_FUNCTION__))
1299 "Assumes sizeof(int) on target is <= 64 and a multiple of char")(static_cast <bool> (PP.getTargetInfo().getIntWidth() <=
64 && (PP.getTargetInfo().getIntWidth() & 7) == 0
&& "Assumes sizeof(int) on target is <= 64 and a multiple of char"
) ? void (0) : __assert_fail ("PP.getTargetInfo().getIntWidth() <= 64 && (PP.getTargetInfo().getIntWidth() & 7) == 0 && \"Assumes sizeof(int) on target is <= 64 and a multiple of char\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1299, __extension__ __PRETTY_FUNCTION__))
;
1300 assert(PP.getTargetInfo().getWCharWidth() <= 64 &&(static_cast <bool> (PP.getTargetInfo().getWCharWidth()
<= 64 && "Assumes sizeof(wchar) on target is <= 64"
) ? void (0) : __assert_fail ("PP.getTargetInfo().getWCharWidth() <= 64 && \"Assumes sizeof(wchar) on target is <= 64\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1301, __extension__ __PRETTY_FUNCTION__))
1301 "Assumes sizeof(wchar) on target is <= 64")(static_cast <bool> (PP.getTargetInfo().getWCharWidth()
<= 64 && "Assumes sizeof(wchar) on target is <= 64"
) ? void (0) : __assert_fail ("PP.getTargetInfo().getWCharWidth() <= 64 && \"Assumes sizeof(wchar) on target is <= 64\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1301, __extension__ __PRETTY_FUNCTION__))
;
1302
1303 SmallVector<uint32_t, 4> codepoint_buffer;
1304 codepoint_buffer.resize(end - begin);
1305 uint32_t *buffer_begin = &codepoint_buffer.front();
1306 uint32_t *buffer_end = buffer_begin + codepoint_buffer.size();
1307
1308 // Unicode escapes representing characters that cannot be correctly
1309 // represented in a single code unit are disallowed in character literals
1310 // by this implementation.
1311 uint32_t largest_character_for_kind;
1312 if (tok::wide_char_constant == Kind) {
1313 largest_character_for_kind =
1314 0xFFFFFFFFu >> (32-PP.getTargetInfo().getWCharWidth());
1315 } else if (tok::utf8_char_constant == Kind) {
1316 largest_character_for_kind = 0x7F;
1317 } else if (tok::utf16_char_constant == Kind) {
1318 largest_character_for_kind = 0xFFFF;
1319 } else if (tok::utf32_char_constant == Kind) {
1320 largest_character_for_kind = 0x10FFFF;
1321 } else {
1322 largest_character_for_kind = 0x7Fu;
1323 }
1324
1325 while (begin != end) {
1326 // Is this a span of non-escape characters?
1327 if (begin[0] != '\\') {
1328 char const *start = begin;
1329 do {
1330 ++begin;
1331 } while (begin != end && *begin != '\\');
1332
1333 char const *tmp_in_start = start;
1334 uint32_t *tmp_out_start = buffer_begin;
1335 llvm::ConversionResult res =
1336 llvm::ConvertUTF8toUTF32(reinterpret_cast<llvm::UTF8 const **>(&start),
1337 reinterpret_cast<llvm::UTF8 const *>(begin),
1338 &buffer_begin, buffer_end, llvm::strictConversion);
1339 if (res != llvm::conversionOK) {
1340 // If we see bad encoding for unprefixed character literals, warn and
1341 // simply copy the byte values, for compatibility with gcc and
1342 // older versions of clang.
1343 bool NoErrorOnBadEncoding = isAscii();
1344 unsigned Msg = diag::err_bad_character_encoding;
1345 if (NoErrorOnBadEncoding)
1346 Msg = diag::warn_bad_character_encoding;
1347 PP.Diag(Loc, Msg);
1348 if (NoErrorOnBadEncoding) {
1349 start = tmp_in_start;
1350 buffer_begin = tmp_out_start;
1351 for (; start != begin; ++start, ++buffer_begin)
1352 *buffer_begin = static_cast<uint8_t>(*start);
1353 } else {
1354 HadError = true;
1355 }
1356 } else {
1357 for (; tmp_out_start < buffer_begin; ++tmp_out_start) {
1358 if (*tmp_out_start > largest_character_for_kind) {
1359 HadError = true;
1360 PP.Diag(Loc, diag::err_character_too_large);
1361 }
1362 }
1363 }
1364
1365 continue;
1366 }
1367 // Is this a Universal Character Name escape?
1368 if (begin[1] == 'u' || begin[1] == 'U') {
1369 unsigned short UcnLen = 0;
1370 if (!ProcessUCNEscape(TokBegin, begin, end, *buffer_begin, UcnLen,
1371 FullSourceLoc(Loc, PP.getSourceManager()),
1372 &PP.getDiagnostics(), PP.getLangOpts(), true)) {
1373 HadError = true;
1374 } else if (*buffer_begin > largest_character_for_kind) {
1375 HadError = true;
1376 PP.Diag(Loc, diag::err_character_too_large);
1377 }
1378
1379 ++buffer_begin;
1380 continue;
1381 }
1382 unsigned CharWidth = getCharWidth(Kind, PP.getTargetInfo());
1383 uint64_t result =
1384 ProcessCharEscape(TokBegin, begin, end, HadError,
1385 FullSourceLoc(Loc,PP.getSourceManager()),
1386 CharWidth, &PP.getDiagnostics(), PP.getLangOpts());
1387 *buffer_begin++ = result;
1388 }
1389
1390 unsigned NumCharsSoFar = buffer_begin - &codepoint_buffer.front();
1391
1392 if (NumCharsSoFar > 1) {
1393 if (isWide())
1394 PP.Diag(Loc, diag::warn_extraneous_char_constant);
1395 else if (isAscii() && NumCharsSoFar == 4)
1396 PP.Diag(Loc, diag::warn_four_char_character_literal);
1397 else if (isAscii())
1398 PP.Diag(Loc, diag::warn_multichar_character_literal);
1399 else
1400 PP.Diag(Loc, diag::err_multichar_utf_character_literal);
1401 IsMultiChar = true;
1402 } else {
1403 IsMultiChar = false;
1404 }
1405
1406 llvm::APInt LitVal(PP.getTargetInfo().getIntWidth(), 0);
1407
1408 // Narrow character literals act as though their value is concatenated
1409 // in this implementation, but warn on overflow.
1410 bool multi_char_too_long = false;
1411 if (isAscii() && isMultiChar()) {
1412 LitVal = 0;
1413 for (size_t i = 0; i < NumCharsSoFar; ++i) {
1414 // check for enough leading zeros to shift into
1415 multi_char_too_long |= (LitVal.countLeadingZeros() < 8);
1416 LitVal <<= 8;
1417 LitVal = LitVal + (codepoint_buffer[i] & 0xFF);
1418 }
1419 } else if (NumCharsSoFar > 0) {
1420 // otherwise just take the last character
1421 LitVal = buffer_begin[-1];
1422 }
1423
1424 if (!HadError && multi_char_too_long) {
1425 PP.Diag(Loc, diag::warn_char_constant_too_large);
1426 }
1427
1428 // Transfer the value from APInt to uint64_t
1429 Value = LitVal.getZExtValue();
1430
1431 // If this is a single narrow character, sign extend it (e.g. '\xFF' is "-1")
1432 // if 'char' is signed for this target (C99 6.4.4.4p10). Note that multiple
1433 // character constants are not sign extended in the this implementation:
1434 // '\xFF\xFF' = 65536 and '\x0\xFF' = 255, which matches GCC.
1435 if (isAscii() && NumCharsSoFar == 1 && (Value & 128) &&
1436 PP.getLangOpts().CharIsSigned)
1437 Value = (signed char)Value;
1438}
1439
1440/// \verbatim
1441/// string-literal: [C++0x lex.string]
1442/// encoding-prefix " [s-char-sequence] "
1443/// encoding-prefix R raw-string
1444/// encoding-prefix:
1445/// u8
1446/// u
1447/// U
1448/// L
1449/// s-char-sequence:
1450/// s-char
1451/// s-char-sequence s-char
1452/// s-char:
1453/// any member of the source character set except the double-quote ",
1454/// backslash \, or new-line character
1455/// escape-sequence
1456/// universal-character-name
1457/// raw-string:
1458/// " d-char-sequence ( r-char-sequence ) d-char-sequence "
1459/// r-char-sequence:
1460/// r-char
1461/// r-char-sequence r-char
1462/// r-char:
1463/// any member of the source character set, except a right parenthesis )
1464/// followed by the initial d-char-sequence (which may be empty)
1465/// followed by a double quote ".
1466/// d-char-sequence:
1467/// d-char
1468/// d-char-sequence d-char
1469/// d-char:
1470/// any member of the basic source character set except:
1471/// space, the left parenthesis (, the right parenthesis ),
1472/// the backslash \, and the control characters representing horizontal
1473/// tab, vertical tab, form feed, and newline.
1474/// escape-sequence: [C++0x lex.ccon]
1475/// simple-escape-sequence
1476/// octal-escape-sequence
1477/// hexadecimal-escape-sequence
1478/// simple-escape-sequence:
1479/// one of \' \" \? \\ \a \b \f \n \r \t \v
1480/// octal-escape-sequence:
1481/// \ octal-digit
1482/// \ octal-digit octal-digit
1483/// \ octal-digit octal-digit octal-digit
1484/// hexadecimal-escape-sequence:
1485/// \x hexadecimal-digit
1486/// hexadecimal-escape-sequence hexadecimal-digit
1487/// universal-character-name:
1488/// \u hex-quad
1489/// \U hex-quad hex-quad
1490/// hex-quad:
1491/// hex-digit hex-digit hex-digit hex-digit
1492/// \endverbatim
1493///
1494StringLiteralParser::
1495StringLiteralParser(ArrayRef<Token> StringToks,
1496 Preprocessor &PP, bool Complain)
1497 : SM(PP.getSourceManager()), Features(PP.getLangOpts()),
1498 Target(PP.getTargetInfo()), Diags(Complain ? &PP.getDiagnostics() :nullptr),
1499 MaxTokenLength(0), SizeBound(0), CharByteWidth(0), Kind(tok::unknown),
1500 ResultPtr(ResultBuf.data()), hadError(false), Pascal(false) {
1501 init(StringToks);
1502}
1503
1504void StringLiteralParser::init(ArrayRef<Token> StringToks){
1505 // The literal token may have come from an invalid source location (e.g. due
1506 // to a PCH error), in which case the token length will be 0.
1507 if (StringToks.empty() || StringToks[0].getLength() < 2)
1508 return DiagnoseLexingError(SourceLocation());
1509
1510 // Scan all of the string portions, remember the max individual token length,
1511 // computing a bound on the concatenated string length, and see whether any
1512 // piece is a wide-string. If any of the string portions is a wide-string
1513 // literal, the result is a wide-string literal [C99 6.4.5p4].
1514 assert(!StringToks.empty() && "expected at least one token")(static_cast <bool> (!StringToks.empty() && "expected at least one token"
) ? void (0) : __assert_fail ("!StringToks.empty() && \"expected at least one token\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1514, __extension__ __PRETTY_FUNCTION__))
;
1515 MaxTokenLength = StringToks[0].getLength();
1516 assert(StringToks[0].getLength() >= 2 && "literal token is invalid!")(static_cast <bool> (StringToks[0].getLength() >= 2 &&
"literal token is invalid!") ? void (0) : __assert_fail ("StringToks[0].getLength() >= 2 && \"literal token is invalid!\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1516, __extension__ __PRETTY_FUNCTION__))
;
1517 SizeBound = StringToks[0].getLength()-2; // -2 for "".
1518 Kind = StringToks[0].getKind();
1519
1520 hadError = false;
1521
1522 // Implement Translation Phase #6: concatenation of string literals
1523 /// (C99 5.1.1.2p1). The common case is only one string fragment.
1524 for (unsigned i = 1; i != StringToks.size(); ++i) {
1525 if (StringToks[i].getLength() < 2)
1526 return DiagnoseLexingError(StringToks[i].getLocation());
1527
1528 // The string could be shorter than this if it needs cleaning, but this is a
1529 // reasonable bound, which is all we need.
1530 assert(StringToks[i].getLength() >= 2 && "literal token is invalid!")(static_cast <bool> (StringToks[i].getLength() >= 2 &&
"literal token is invalid!") ? void (0) : __assert_fail ("StringToks[i].getLength() >= 2 && \"literal token is invalid!\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1530, __extension__ __PRETTY_FUNCTION__))
;
1531 SizeBound += StringToks[i].getLength()-2; // -2 for "".
1532
1533 // Remember maximum string piece length.
1534 if (StringToks[i].getLength() > MaxTokenLength)
1535 MaxTokenLength = StringToks[i].getLength();
1536
1537 // Remember if we see any wide or utf-8/16/32 strings.
1538 // Also check for illegal concatenations.
1539 if (StringToks[i].isNot(Kind) && StringToks[i].isNot(tok::string_literal)) {
1540 if (isAscii()) {
1541 Kind = StringToks[i].getKind();
1542 } else {
1543 if (Diags)
1544 Diags->Report(StringToks[i].getLocation(),
1545 diag::err_unsupported_string_concat);
1546 hadError = true;
1547 }
1548 }
1549 }
1550
1551 // Include space for the null terminator.
1552 ++SizeBound;
1553
1554 // TODO: K&R warning: "traditional C rejects string constant concatenation"
1555
1556 // Get the width in bytes of char/wchar_t/char16_t/char32_t
1557 CharByteWidth = getCharWidth(Kind, Target);
1558 assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple")(static_cast <bool> ((CharByteWidth & 7) == 0 &&
"Assumes character size is byte multiple") ? void (0) : __assert_fail
("(CharByteWidth & 7) == 0 && \"Assumes character size is byte multiple\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1558, __extension__ __PRETTY_FUNCTION__))
;
1559 CharByteWidth /= 8;
1560
1561 // The output buffer size needs to be large enough to hold wide characters.
1562 // This is a worst-case assumption which basically corresponds to L"" "long".
1563 SizeBound *= CharByteWidth;
1564
1565 // Size the temporary buffer to hold the result string data.
1566 ResultBuf.resize(SizeBound);
1567
1568 // Likewise, but for each string piece.
1569 SmallString<512> TokenBuf;
1570 TokenBuf.resize(MaxTokenLength);
1571
1572 // Loop over all the strings, getting their spelling, and expanding them to
1573 // wide strings as appropriate.
1574 ResultPtr = &ResultBuf[0]; // Next byte to fill in.
1575
1576 Pascal = false;
1577
1578 SourceLocation UDSuffixTokLoc;
1579
1580 for (unsigned i = 0, e = StringToks.size(); i != e; ++i) {
1581 const char *ThisTokBuf = &TokenBuf[0];
1582 // Get the spelling of the token, which eliminates trigraphs, etc. We know
1583 // that ThisTokBuf points to a buffer that is big enough for the whole token
1584 // and 'spelled' tokens can only shrink.
1585 bool StringInvalid = false;
1586 unsigned ThisTokLen =
1587 Lexer::getSpelling(StringToks[i], ThisTokBuf, SM, Features,
1588 &StringInvalid);
1589 if (StringInvalid)
1590 return DiagnoseLexingError(StringToks[i].getLocation());
1591
1592 const char *ThisTokBegin = ThisTokBuf;
1593 const char *ThisTokEnd = ThisTokBuf+ThisTokLen;
1594
1595 // Remove an optional ud-suffix.
1596 if (ThisTokEnd[-1] != '"') {
1597 const char *UDSuffixEnd = ThisTokEnd;
1598 do {
1599 --ThisTokEnd;
1600 } while (ThisTokEnd[-1] != '"');
1601
1602 StringRef UDSuffix(ThisTokEnd, UDSuffixEnd - ThisTokEnd);
1603
1604 if (UDSuffixBuf.empty()) {
1605 if (StringToks[i].hasUCN())
1606 expandUCNs(UDSuffixBuf, UDSuffix);
1607 else
1608 UDSuffixBuf.assign(UDSuffix);
1609 UDSuffixToken = i;
1610 UDSuffixOffset = ThisTokEnd - ThisTokBuf;
1611 UDSuffixTokLoc = StringToks[i].getLocation();
1612 } else {
1613 SmallString<32> ExpandedUDSuffix;
1614 if (StringToks[i].hasUCN()) {
1615 expandUCNs(ExpandedUDSuffix, UDSuffix);
1616 UDSuffix = ExpandedUDSuffix;
1617 }
1618
1619 // C++11 [lex.ext]p8: At the end of phase 6, if a string literal is the
1620 // result of a concatenation involving at least one user-defined-string-
1621 // literal, all the participating user-defined-string-literals shall
1622 // have the same ud-suffix.
1623 if (UDSuffixBuf != UDSuffix) {
1624 if (Diags) {
1625 SourceLocation TokLoc = StringToks[i].getLocation();
1626 Diags->Report(TokLoc, diag::err_string_concat_mixed_suffix)
1627 << UDSuffixBuf << UDSuffix
1628 << SourceRange(UDSuffixTokLoc, UDSuffixTokLoc)
1629 << SourceRange(TokLoc, TokLoc);
1630 }
1631 hadError = true;
1632 }
1633 }
1634 }
1635
1636 // Strip the end quote.
1637 --ThisTokEnd;
1638
1639 // TODO: Input character set mapping support.
1640
1641 // Skip marker for wide or unicode strings.
1642 if (ThisTokBuf[0] == 'L' || ThisTokBuf[0] == 'u' || ThisTokBuf[0] == 'U') {
1643 ++ThisTokBuf;
1644 // Skip 8 of u8 marker for utf8 strings.
1645 if (ThisTokBuf[0] == '8')
1646 ++ThisTokBuf;
1647 }
1648
1649 // Check for raw string
1650 if (ThisTokBuf[0] == 'R') {
1651 if (ThisTokBuf[1] != '"') {
1652 // The file may have come from PCH and then changed after loading the
1653 // PCH; Fail gracefully.
1654 return DiagnoseLexingError(StringToks[i].getLocation());
1655 }
1656 ThisTokBuf += 2; // skip R"
1657
1658 // C++11 [lex.string]p2: A `d-char-sequence` shall consist of at most 16
1659 // characters.
1660 constexpr unsigned MaxRawStrDelimLen = 16;
1661
1662 const char *Prefix = ThisTokBuf;
1663 while (ThisTokBuf - Prefix < MaxRawStrDelimLen && ThisTokBuf[0] != '(')
1664 ++ThisTokBuf;
1665 if (ThisTokBuf[0] != '(')
1666 return DiagnoseLexingError(StringToks[i].getLocation());
1667 ++ThisTokBuf; // skip '('
1668
1669 // Remove same number of characters from the end
1670 ThisTokEnd -= ThisTokBuf - Prefix;
1671 if (ThisTokEnd < ThisTokBuf)
1672 return DiagnoseLexingError(StringToks[i].getLocation());
1673
1674 // C++14 [lex.string]p4: A source-file new-line in a raw string literal
1675 // results in a new-line in the resulting execution string-literal.
1676 StringRef RemainingTokenSpan(ThisTokBuf, ThisTokEnd - ThisTokBuf);
1677 while (!RemainingTokenSpan.empty()) {
1678 // Split the string literal on \r\n boundaries.
1679 size_t CRLFPos = RemainingTokenSpan.find("\r\n");
1680 StringRef BeforeCRLF = RemainingTokenSpan.substr(0, CRLFPos);
1681 StringRef AfterCRLF = RemainingTokenSpan.substr(CRLFPos);
1682
1683 // Copy everything before the \r\n sequence into the string literal.
1684 if (CopyStringFragment(StringToks[i], ThisTokBegin, BeforeCRLF))
1685 hadError = true;
1686
1687 // Point into the \n inside the \r\n sequence and operate on the
1688 // remaining portion of the literal.
1689 RemainingTokenSpan = AfterCRLF.substr(1);
1690 }
1691 } else {
1692 if (ThisTokBuf[0] != '"') {
1693 // The file may have come from PCH and then changed after loading the
1694 // PCH; Fail gracefully.
1695 return DiagnoseLexingError(StringToks[i].getLocation());
1696 }
1697 ++ThisTokBuf; // skip "
1698
1699 // Check if this is a pascal string
1700 if (Features.PascalStrings && ThisTokBuf + 1 != ThisTokEnd &&
1701 ThisTokBuf[0] == '\\' && ThisTokBuf[1] == 'p') {
1702
1703 // If the \p sequence is found in the first token, we have a pascal string
1704 // Otherwise, if we already have a pascal string, ignore the first \p
1705 if (i == 0) {
1706 ++ThisTokBuf;
1707 Pascal = true;
1708 } else if (Pascal)
1709 ThisTokBuf += 2;
1710 }
1711
1712 while (ThisTokBuf != ThisTokEnd) {
1713 // Is this a span of non-escape characters?
1714 if (ThisTokBuf[0] != '\\') {
1715 const char *InStart = ThisTokBuf;
1716 do {
1717 ++ThisTokBuf;
1718 } while (ThisTokBuf != ThisTokEnd && ThisTokBuf[0] != '\\');
1719
1720 // Copy the character span over.
1721 if (CopyStringFragment(StringToks[i], ThisTokBegin,
1722 StringRef(InStart, ThisTokBuf - InStart)))
1723 hadError = true;
1724 continue;
1725 }
1726 // Is this a Universal Character Name escape?
1727 if (ThisTokBuf[1] == 'u' || ThisTokBuf[1] == 'U') {
1728 EncodeUCNEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd,
1729 ResultPtr, hadError,
1730 FullSourceLoc(StringToks[i].getLocation(), SM),
1731 CharByteWidth, Diags, Features);
1732 continue;
1733 }
1734 // Otherwise, this is a non-UCN escape character. Process it.
1735 unsigned ResultChar =
1736 ProcessCharEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd, hadError,
1737 FullSourceLoc(StringToks[i].getLocation(), SM),
1738 CharByteWidth*8, Diags, Features);
1739
1740 if (CharByteWidth == 4) {
1741 // FIXME: Make the type of the result buffer correct instead of
1742 // using reinterpret_cast.
1743 llvm::UTF32 *ResultWidePtr = reinterpret_cast<llvm::UTF32*>(ResultPtr);
1744 *ResultWidePtr = ResultChar;
1745 ResultPtr += 4;
1746 } else if (CharByteWidth == 2) {
1747 // FIXME: Make the type of the result buffer correct instead of
1748 // using reinterpret_cast.
1749 llvm::UTF16 *ResultWidePtr = reinterpret_cast<llvm::UTF16*>(ResultPtr);
1750 *ResultWidePtr = ResultChar & 0xFFFF;
1751 ResultPtr += 2;
1752 } else {
1753 assert(CharByteWidth == 1 && "Unexpected char width")(static_cast <bool> (CharByteWidth == 1 && "Unexpected char width"
) ? void (0) : __assert_fail ("CharByteWidth == 1 && \"Unexpected char width\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1753, __extension__ __PRETTY_FUNCTION__))
;
1754 *ResultPtr++ = ResultChar & 0xFF;
1755 }
1756 }
1757 }
1758 }
1759
1760 if (Pascal) {
1761 if (CharByteWidth == 4) {
1762 // FIXME: Make the type of the result buffer correct instead of
1763 // using reinterpret_cast.
1764 llvm::UTF32 *ResultWidePtr = reinterpret_cast<llvm::UTF32*>(ResultBuf.data());
1765 ResultWidePtr[0] = GetNumStringChars() - 1;
1766 } else if (CharByteWidth == 2) {
1767 // FIXME: Make the type of the result buffer correct instead of
1768 // using reinterpret_cast.
1769 llvm::UTF16 *ResultWidePtr = reinterpret_cast<llvm::UTF16*>(ResultBuf.data());
1770 ResultWidePtr[0] = GetNumStringChars() - 1;
1771 } else {
1772 assert(CharByteWidth == 1 && "Unexpected char width")(static_cast <bool> (CharByteWidth == 1 && "Unexpected char width"
) ? void (0) : __assert_fail ("CharByteWidth == 1 && \"Unexpected char width\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1772, __extension__ __PRETTY_FUNCTION__))
;
1773 ResultBuf[0] = GetNumStringChars() - 1;
1774 }
1775
1776 // Verify that pascal strings aren't too large.
1777 if (GetStringLength() > 256) {
1778 if (Diags)
1779 Diags->Report(StringToks.front().getLocation(),
1780 diag::err_pascal_string_too_long)
1781 << SourceRange(StringToks.front().getLocation(),
1782 StringToks.back().getLocation());
1783 hadError = true;
1784 return;
1785 }
1786 } else if (Diags) {
1787 // Complain if this string literal has too many characters.
1788 unsigned MaxChars = Features.CPlusPlus? 65536 : Features.C99 ? 4095 : 509;
1789
1790 if (GetNumStringChars() > MaxChars)
1791 Diags->Report(StringToks.front().getLocation(),
1792 diag::ext_string_too_long)
1793 << GetNumStringChars() << MaxChars
1794 << (Features.CPlusPlus ? 2 : Features.C99 ? 1 : 0)
1795 << SourceRange(StringToks.front().getLocation(),
1796 StringToks.back().getLocation());
1797 }
1798}
1799
1800static const char *resyncUTF8(const char *Err, const char *End) {
1801 if (Err == End)
1802 return End;
1803 End = Err + std::min<unsigned>(llvm::getNumBytesForUTF8(*Err), End-Err);
1804 while (++Err != End && (*Err & 0xC0) == 0x80)
1805 ;
1806 return Err;
1807}
1808
1809/// This function copies from Fragment, which is a sequence of bytes
1810/// within Tok's contents (which begin at TokBegin) into ResultPtr.
1811/// Performs widening for multi-byte characters.
1812bool StringLiteralParser::CopyStringFragment(const Token &Tok,
1813 const char *TokBegin,
1814 StringRef Fragment) {
1815 const llvm::UTF8 *ErrorPtrTmp;
1816 if (ConvertUTF8toWide(CharByteWidth, Fragment, ResultPtr, ErrorPtrTmp))
1817 return false;
1818
1819 // If we see bad encoding for unprefixed string literals, warn and
1820 // simply copy the byte values, for compatibility with gcc and older
1821 // versions of clang.
1822 bool NoErrorOnBadEncoding = isAscii();
1823 if (NoErrorOnBadEncoding) {
1824 memcpy(ResultPtr, Fragment.data(), Fragment.size());
1825 ResultPtr += Fragment.size();
1826 }
1827
1828 if (Diags) {
1829 const char *ErrorPtr = reinterpret_cast<const char *>(ErrorPtrTmp);
1830
1831 FullSourceLoc SourceLoc(Tok.getLocation(), SM);
1832 const DiagnosticBuilder &Builder =
1833 Diag(Diags, Features, SourceLoc, TokBegin,
1834 ErrorPtr, resyncUTF8(ErrorPtr, Fragment.end()),
1835 NoErrorOnBadEncoding ? diag::warn_bad_string_encoding
1836 : diag::err_bad_string_encoding);
1837
1838 const char *NextStart = resyncUTF8(ErrorPtr, Fragment.end());
1839 StringRef NextFragment(NextStart, Fragment.end()-NextStart);
1840
1841 // Decode into a dummy buffer.
1842 SmallString<512> Dummy;
1843 Dummy.reserve(Fragment.size() * CharByteWidth);
1844 char *Ptr = Dummy.data();
1845
1846 while (!ConvertUTF8toWide(CharByteWidth, NextFragment, Ptr, ErrorPtrTmp)) {
1847 const char *ErrorPtr = reinterpret_cast<const char *>(ErrorPtrTmp);
1848 NextStart = resyncUTF8(ErrorPtr, Fragment.end());
1849 Builder << MakeCharSourceRange(Features, SourceLoc, TokBegin,
1850 ErrorPtr, NextStart);
1851 NextFragment = StringRef(NextStart, Fragment.end()-NextStart);
1852 }
1853 }
1854 return !NoErrorOnBadEncoding;
1855}
1856
1857void StringLiteralParser::DiagnoseLexingError(SourceLocation Loc) {
1858 hadError = true;
1859 if (Diags)
1860 Diags->Report(Loc, diag::err_lexing_string);
1861}
1862
1863/// getOffsetOfStringByte - This function returns the offset of the
1864/// specified byte of the string data represented by Token. This handles
1865/// advancing over escape sequences in the string.
1866unsigned StringLiteralParser::getOffsetOfStringByte(const Token &Tok,
1867 unsigned ByteNo) const {
1868 // Get the spelling of the token.
1869 SmallString<32> SpellingBuffer;
1870 SpellingBuffer.resize(Tok.getLength());
1871
1872 bool StringInvalid = false;
1873 const char *SpellingPtr = &SpellingBuffer[0];
1874 unsigned TokLen = Lexer::getSpelling(Tok, SpellingPtr, SM, Features,
1875 &StringInvalid);
1876 if (StringInvalid)
1877 return 0;
1878
1879 const char *SpellingStart = SpellingPtr;
1880 const char *SpellingEnd = SpellingPtr+TokLen;
1881
1882 // Handle UTF-8 strings just like narrow strings.
1883 if (SpellingPtr[0] == 'u' && SpellingPtr[1] == '8')
1884 SpellingPtr += 2;
1885
1886 assert(SpellingPtr[0] != 'L' && SpellingPtr[0] != 'u' &&(static_cast <bool> (SpellingPtr[0] != 'L' && SpellingPtr
[0] != 'u' && SpellingPtr[0] != 'U' && "Doesn't handle wide or utf strings yet"
) ? void (0) : __assert_fail ("SpellingPtr[0] != 'L' && SpellingPtr[0] != 'u' && SpellingPtr[0] != 'U' && \"Doesn't handle wide or utf strings yet\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1887, __extension__ __PRETTY_FUNCTION__))
1887 SpellingPtr[0] != 'U' && "Doesn't handle wide or utf strings yet")(static_cast <bool> (SpellingPtr[0] != 'L' && SpellingPtr
[0] != 'u' && SpellingPtr[0] != 'U' && "Doesn't handle wide or utf strings yet"
) ? void (0) : __assert_fail ("SpellingPtr[0] != 'L' && SpellingPtr[0] != 'u' && SpellingPtr[0] != 'U' && \"Doesn't handle wide or utf strings yet\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1887, __extension__ __PRETTY_FUNCTION__))
;
1888
1889 // For raw string literals, this is easy.
1890 if (SpellingPtr[0] == 'R') {
1891 assert(SpellingPtr[1] == '"' && "Should be a raw string literal!")(static_cast <bool> (SpellingPtr[1] == '"' && "Should be a raw string literal!"
) ? void (0) : __assert_fail ("SpellingPtr[1] == '\"' && \"Should be a raw string literal!\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1891, __extension__ __PRETTY_FUNCTION__))
;
1892 // Skip 'R"'.
1893 SpellingPtr += 2;
1894 while (*SpellingPtr != '(') {
1895 ++SpellingPtr;
1896 assert(SpellingPtr < SpellingEnd && "Missing ( for raw string literal")(static_cast <bool> (SpellingPtr < SpellingEnd &&
"Missing ( for raw string literal") ? void (0) : __assert_fail
("SpellingPtr < SpellingEnd && \"Missing ( for raw string literal\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1896, __extension__ __PRETTY_FUNCTION__))
;
1897 }
1898 // Skip '('.
1899 ++SpellingPtr;
1900 return SpellingPtr - SpellingStart + ByteNo;
1901 }
1902
1903 // Skip over the leading quote
1904 assert(SpellingPtr[0] == '"' && "Should be a string literal!")(static_cast <bool> (SpellingPtr[0] == '"' && "Should be a string literal!"
) ? void (0) : __assert_fail ("SpellingPtr[0] == '\"' && \"Should be a string literal!\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1904, __extension__ __PRETTY_FUNCTION__))
;
1905 ++SpellingPtr;
1906
1907 // Skip over bytes until we find the offset we're looking for.
1908 while (ByteNo) {
1909 assert(SpellingPtr < SpellingEnd && "Didn't find byte offset!")(static_cast <bool> (SpellingPtr < SpellingEnd &&
"Didn't find byte offset!") ? void (0) : __assert_fail ("SpellingPtr < SpellingEnd && \"Didn't find byte offset!\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1909, __extension__ __PRETTY_FUNCTION__))
;
1910
1911 // Step over non-escapes simply.
1912 if (*SpellingPtr != '\\') {
1913 ++SpellingPtr;
1914 --ByteNo;
1915 continue;
1916 }
1917
1918 // Otherwise, this is an escape character. Advance over it.
1919 bool HadError = false;
1920 if (SpellingPtr[1] == 'u' || SpellingPtr[1] == 'U') {
1921 const char *EscapePtr = SpellingPtr;
1922 unsigned Len = MeasureUCNEscape(SpellingStart, SpellingPtr, SpellingEnd,
1923 1, Features, HadError);
1924 if (Len > ByteNo) {
1925 // ByteNo is somewhere within the escape sequence.
1926 SpellingPtr = EscapePtr;
1927 break;
1928 }
1929 ByteNo -= Len;
1930 } else {
1931 ProcessCharEscape(SpellingStart, SpellingPtr, SpellingEnd, HadError,
1932 FullSourceLoc(Tok.getLocation(), SM),
1933 CharByteWidth*8, Diags, Features);
1934 --ByteNo;
1935 }
1936 assert(!HadError && "This method isn't valid on erroneous strings")(static_cast <bool> (!HadError && "This method isn't valid on erroneous strings"
) ? void (0) : __assert_fail ("!HadError && \"This method isn't valid on erroneous strings\""
, "/build/llvm-toolchain-snapshot-13~++20210621111111+acefe0eaaf82/clang/lib/Lex/LiteralSupport.cpp"
, 1936, __extension__ __PRETTY_FUNCTION__))
;
1937 }
1938
1939 return SpellingPtr-SpellingStart;
1940}
1941
1942/// Determine whether a suffix is a valid ud-suffix. We avoid treating reserved
1943/// suffixes as ud-suffixes, because the diagnostic experience is better if we
1944/// treat it as an invalid suffix.
1945bool StringLiteralParser::isValidUDSuffix(const LangOptions &LangOpts,
1946 StringRef Suffix) {
1947 return NumericLiteralParser::isValidUDSuffix(LangOpts, Suffix) ||
1948 Suffix == "sv";
1949}