1 //===-- StringPrinter.cpp ----------------------------------------*- C++
2 //-*-===//
3 //
4 //                     The LLVM Compiler Infrastructure
5 //
6 // This file is distributed under the University of Illinois Open Source
7 // License. See LICENSE.TXT for details.
8 //
9 //===----------------------------------------------------------------------===//
10 
11 #include "lldb/DataFormatters/StringPrinter.h"
12 
13 #include "lldb/Core/Debugger.h"
14 #include "lldb/Core/ValueObject.h"
15 #include "lldb/Target/Language.h"
16 #include "lldb/Target/Process.h"
17 #include "lldb/Target/Target.h"
18 #include "lldb/Utility/Status.h"
19 
20 #include "llvm/Support/ConvertUTF.h"
21 
22 #include <ctype.h>
23 #include <locale>
24 
25 using namespace lldb;
26 using namespace lldb_private;
27 using namespace lldb_private::formatters;
28 
29 // we define this for all values of type but only implement it for those we
30 // care about that's good because we get linker errors for any unsupported type
31 template <lldb_private::formatters::StringPrinter::StringElementType type>
32 static StringPrinter::StringPrinterBufferPointer<>
33 GetPrintableImpl(uint8_t *buffer, uint8_t *buffer_end, uint8_t *&next);
34 
35 // mimic isprint() for Unicode codepoints
36 static bool isprint(char32_t codepoint) {
37   if (codepoint <= 0x1F || codepoint == 0x7F) // C0
38   {
39     return false;
40   }
41   if (codepoint >= 0x80 && codepoint <= 0x9F) // C1
42   {
43     return false;
44   }
45   if (codepoint == 0x2028 || codepoint == 0x2029) // line/paragraph separators
46   {
47     return false;
48   }
49   if (codepoint == 0x200E || codepoint == 0x200F ||
50       (codepoint >= 0x202A &&
51        codepoint <= 0x202E)) // bidirectional text control
52   {
53     return false;
54   }
55   if (codepoint >= 0xFFF9 &&
56       codepoint <= 0xFFFF) // interlinears and generally specials
57   {
58     return false;
59   }
60   return true;
61 }
62 
63 template <>
64 StringPrinter::StringPrinterBufferPointer<>
65 GetPrintableImpl<StringPrinter::StringElementType::ASCII>(uint8_t *buffer,
66                                                           uint8_t *buffer_end,
67                                                           uint8_t *&next) {
68   StringPrinter::StringPrinterBufferPointer<> retval = {nullptr};
69 
70   switch (*buffer) {
71   case 0:
72     retval = {"\\0", 2};
73     break;
74   case '\a':
75     retval = {"\\a", 2};
76     break;
77   case '\b':
78     retval = {"\\b", 2};
79     break;
80   case '\f':
81     retval = {"\\f", 2};
82     break;
83   case '\n':
84     retval = {"\\n", 2};
85     break;
86   case '\r':
87     retval = {"\\r", 2};
88     break;
89   case '\t':
90     retval = {"\\t", 2};
91     break;
92   case '\v':
93     retval = {"\\v", 2};
94     break;
95   case '\"':
96     retval = {"\\\"", 2};
97     break;
98   case '\\':
99     retval = {"\\\\", 2};
100     break;
101   default:
102     if (isprint(*buffer))
103       retval = {buffer, 1};
104     else {
105       uint8_t *data = new uint8_t[5];
106       sprintf((char *)data, "\\x%02x", *buffer);
107       retval = {data, 4, [](const uint8_t *c) { delete[] c; }};
108       break;
109     }
110   }
111 
112   next = buffer + 1;
113   return retval;
114 }
115 
116 static char32_t ConvertUTF8ToCodePoint(unsigned char c0, unsigned char c1) {
117   return (c0 - 192) * 64 + (c1 - 128);
118 }
119 static char32_t ConvertUTF8ToCodePoint(unsigned char c0, unsigned char c1,
120                                        unsigned char c2) {
121   return (c0 - 224) * 4096 + (c1 - 128) * 64 + (c2 - 128);
122 }
123 static char32_t ConvertUTF8ToCodePoint(unsigned char c0, unsigned char c1,
124                                        unsigned char c2, unsigned char c3) {
125   return (c0 - 240) * 262144 + (c2 - 128) * 4096 + (c2 - 128) * 64 + (c3 - 128);
126 }
127 
128 template <>
129 StringPrinter::StringPrinterBufferPointer<>
130 GetPrintableImpl<StringPrinter::StringElementType::UTF8>(uint8_t *buffer,
131                                                          uint8_t *buffer_end,
132                                                          uint8_t *&next) {
133   StringPrinter::StringPrinterBufferPointer<> retval{nullptr};
134 
135   unsigned utf8_encoded_len = llvm::getNumBytesForUTF8(*buffer);
136 
137   if (1u + std::distance(buffer, buffer_end) < utf8_encoded_len) {
138     // I don't have enough bytes - print whatever I have left
139     retval = {buffer, static_cast<size_t>(1 + buffer_end - buffer)};
140     next = buffer_end + 1;
141     return retval;
142   }
143 
144   char32_t codepoint = 0;
145   switch (utf8_encoded_len) {
146   case 1:
147     // this is just an ASCII byte - ask ASCII
148     return GetPrintableImpl<StringPrinter::StringElementType::ASCII>(
149         buffer, buffer_end, next);
150   case 2:
151     codepoint = ConvertUTF8ToCodePoint((unsigned char)*buffer,
152                                        (unsigned char)*(buffer + 1));
153     break;
154   case 3:
155     codepoint = ConvertUTF8ToCodePoint((unsigned char)*buffer,
156                                        (unsigned char)*(buffer + 1),
157                                        (unsigned char)*(buffer + 2));
158     break;
159   case 4:
160     codepoint = ConvertUTF8ToCodePoint(
161         (unsigned char)*buffer, (unsigned char)*(buffer + 1),
162         (unsigned char)*(buffer + 2), (unsigned char)*(buffer + 3));
163     break;
164   default:
165     // this is probably some bogus non-character thing just print it as-is and
166     // hope to sync up again soon
167     retval = {buffer, 1};
168     next = buffer + 1;
169     return retval;
170   }
171 
172   if (codepoint) {
173     switch (codepoint) {
174     case 0:
175       retval = {"\\0", 2};
176       break;
177     case '\a':
178       retval = {"\\a", 2};
179       break;
180     case '\b':
181       retval = {"\\b", 2};
182       break;
183     case '\f':
184       retval = {"\\f", 2};
185       break;
186     case '\n':
187       retval = {"\\n", 2};
188       break;
189     case '\r':
190       retval = {"\\r", 2};
191       break;
192     case '\t':
193       retval = {"\\t", 2};
194       break;
195     case '\v':
196       retval = {"\\v", 2};
197       break;
198     case '\"':
199       retval = {"\\\"", 2};
200       break;
201     case '\\':
202       retval = {"\\\\", 2};
203       break;
204     default:
205       if (isprint(codepoint))
206         retval = {buffer, utf8_encoded_len};
207       else {
208         uint8_t *data = new uint8_t[11];
209         sprintf((char *)data, "\\U%08x", (unsigned)codepoint);
210         retval = {data, 10, [](const uint8_t *c) { delete[] c; }};
211         break;
212       }
213     }
214 
215     next = buffer + utf8_encoded_len;
216     return retval;
217   }
218 
219   // this should not happen - but just in case.. try to resync at some point
220   retval = {buffer, 1};
221   next = buffer + 1;
222   return retval;
223 }
224 
225 // Given a sequence of bytes, this function returns: a sequence of bytes to
226 // actually print out + a length the following unscanned position of the buffer
227 // is in next
228 static StringPrinter::StringPrinterBufferPointer<>
229 GetPrintable(StringPrinter::StringElementType type, uint8_t *buffer,
230              uint8_t *buffer_end, uint8_t *&next) {
231   if (!buffer)
232     return {nullptr};
233 
234   switch (type) {
235   case StringPrinter::StringElementType::ASCII:
236     return GetPrintableImpl<StringPrinter::StringElementType::ASCII>(
237         buffer, buffer_end, next);
238   case StringPrinter::StringElementType::UTF8:
239     return GetPrintableImpl<StringPrinter::StringElementType::UTF8>(
240         buffer, buffer_end, next);
241   default:
242     return {nullptr};
243   }
244 }
245 
246 StringPrinter::EscapingHelper
247 StringPrinter::GetDefaultEscapingHelper(GetPrintableElementType elem_type) {
248   switch (elem_type) {
249   case GetPrintableElementType::UTF8:
250     return [](uint8_t *buffer, uint8_t *buffer_end,
251               uint8_t *&next) -> StringPrinter::StringPrinterBufferPointer<> {
252       return GetPrintable(StringPrinter::StringElementType::UTF8, buffer,
253                           buffer_end, next);
254     };
255   case GetPrintableElementType::ASCII:
256     return [](uint8_t *buffer, uint8_t *buffer_end,
257               uint8_t *&next) -> StringPrinter::StringPrinterBufferPointer<> {
258       return GetPrintable(StringPrinter::StringElementType::ASCII, buffer,
259                           buffer_end, next);
260     };
261   }
262   llvm_unreachable("bad element type");
263 }
264 
265 // use this call if you already have an LLDB-side buffer for the data
266 template <typename SourceDataType>
267 static bool DumpUTFBufferToStream(
268     llvm::ConversionResult (*ConvertFunction)(const SourceDataType **,
269                                               const SourceDataType *,
270                                               llvm::UTF8 **, llvm::UTF8 *,
271                                               llvm::ConversionFlags),
272     const StringPrinter::ReadBufferAndDumpToStreamOptions &dump_options) {
273   Stream &stream(*dump_options.GetStream());
274   if (dump_options.GetPrefixToken() != 0)
275     stream.Printf("%s", dump_options.GetPrefixToken());
276   if (dump_options.GetQuote() != 0)
277     stream.Printf("%c", dump_options.GetQuote());
278   auto data(dump_options.GetData());
279   auto source_size(dump_options.GetSourceSize());
280   if (data.GetByteSize() && data.GetDataStart() && data.GetDataEnd()) {
281     const int bufferSPSize = data.GetByteSize();
282     if (dump_options.GetSourceSize() == 0) {
283       const int origin_encoding = 8 * sizeof(SourceDataType);
284       source_size = bufferSPSize / (origin_encoding / 4);
285     }
286 
287     const SourceDataType *data_ptr =
288         (const SourceDataType *)data.GetDataStart();
289     const SourceDataType *data_end_ptr = data_ptr + source_size;
290 
291     const bool zero_is_terminator = dump_options.GetBinaryZeroIsTerminator();
292 
293     if (zero_is_terminator) {
294       while (data_ptr < data_end_ptr) {
295         if (!*data_ptr) {
296           data_end_ptr = data_ptr;
297           break;
298         }
299         data_ptr++;
300       }
301 
302       data_ptr = (const SourceDataType *)data.GetDataStart();
303     }
304 
305     lldb::DataBufferSP utf8_data_buffer_sp;
306     llvm::UTF8 *utf8_data_ptr = nullptr;
307     llvm::UTF8 *utf8_data_end_ptr = nullptr;
308 
309     if (ConvertFunction) {
310       utf8_data_buffer_sp.reset(new DataBufferHeap(4 * bufferSPSize, 0));
311       utf8_data_ptr = (llvm::UTF8 *)utf8_data_buffer_sp->GetBytes();
312       utf8_data_end_ptr = utf8_data_ptr + utf8_data_buffer_sp->GetByteSize();
313       ConvertFunction(&data_ptr, data_end_ptr, &utf8_data_ptr,
314                       utf8_data_end_ptr, llvm::lenientConversion);
315       if (!zero_is_terminator)
316         utf8_data_end_ptr = utf8_data_ptr;
317       // needed because the ConvertFunction will change the value of the
318       // data_ptr.
319       utf8_data_ptr =
320           (llvm::UTF8 *)utf8_data_buffer_sp->GetBytes();
321     } else {
322       // just copy the pointers - the cast is necessary to make the compiler
323       // happy but this should only happen if we are reading UTF8 data
324       utf8_data_ptr = const_cast<llvm::UTF8 *>(
325           reinterpret_cast<const llvm::UTF8 *>(data_ptr));
326       utf8_data_end_ptr = const_cast<llvm::UTF8 *>(
327           reinterpret_cast<const llvm::UTF8 *>(data_end_ptr));
328     }
329 
330     const bool escape_non_printables = dump_options.GetEscapeNonPrintables();
331     lldb_private::formatters::StringPrinter::EscapingHelper escaping_callback;
332     if (escape_non_printables) {
333       if (Language *language = Language::FindPlugin(dump_options.GetLanguage()))
334         escaping_callback = language->GetStringPrinterEscapingHelper(
335             lldb_private::formatters::StringPrinter::GetPrintableElementType::
336                 UTF8);
337       else
338         escaping_callback =
339             lldb_private::formatters::StringPrinter::GetDefaultEscapingHelper(
340                 lldb_private::formatters::StringPrinter::
341                     GetPrintableElementType::UTF8);
342     }
343 
344     // since we tend to accept partial data (and even partially malformed data)
345     // we might end up with no NULL terminator before the end_ptr hence we need
346     // to take a slower route and ensure we stay within boundaries
347     for (; utf8_data_ptr < utf8_data_end_ptr;) {
348       if (zero_is_terminator && !*utf8_data_ptr)
349         break;
350 
351       if (escape_non_printables) {
352         uint8_t *next_data = nullptr;
353         auto printable =
354             escaping_callback(utf8_data_ptr, utf8_data_end_ptr, next_data);
355         auto printable_bytes = printable.GetBytes();
356         auto printable_size = printable.GetSize();
357         if (!printable_bytes || !next_data) {
358           // GetPrintable() failed on us - print one byte in a desperate resync
359           // attempt
360           printable_bytes = utf8_data_ptr;
361           printable_size = 1;
362           next_data = utf8_data_ptr + 1;
363         }
364         for (unsigned c = 0; c < printable_size; c++)
365           stream.Printf("%c", *(printable_bytes + c));
366         utf8_data_ptr = (uint8_t *)next_data;
367       } else {
368         stream.Printf("%c", *utf8_data_ptr);
369         utf8_data_ptr++;
370       }
371     }
372   }
373   if (dump_options.GetQuote() != 0)
374     stream.Printf("%c", dump_options.GetQuote());
375   if (dump_options.GetSuffixToken() != 0)
376     stream.Printf("%s", dump_options.GetSuffixToken());
377   if (dump_options.GetIsTruncated())
378     stream.Printf("...");
379   return true;
380 }
381 
382 lldb_private::formatters::StringPrinter::ReadStringAndDumpToStreamOptions::
383     ReadStringAndDumpToStreamOptions(ValueObject &valobj)
384     : ReadStringAndDumpToStreamOptions() {
385   SetEscapeNonPrintables(
386       valobj.GetTargetSP()->GetDebugger().GetEscapeNonPrintables());
387 }
388 
389 lldb_private::formatters::StringPrinter::ReadBufferAndDumpToStreamOptions::
390     ReadBufferAndDumpToStreamOptions(ValueObject &valobj)
391     : ReadBufferAndDumpToStreamOptions() {
392   SetEscapeNonPrintables(
393       valobj.GetTargetSP()->GetDebugger().GetEscapeNonPrintables());
394 }
395 
396 lldb_private::formatters::StringPrinter::ReadBufferAndDumpToStreamOptions::
397     ReadBufferAndDumpToStreamOptions(
398         const ReadStringAndDumpToStreamOptions &options)
399     : ReadBufferAndDumpToStreamOptions() {
400   SetStream(options.GetStream());
401   SetPrefixToken(options.GetPrefixToken());
402   SetSuffixToken(options.GetSuffixToken());
403   SetQuote(options.GetQuote());
404   SetEscapeNonPrintables(options.GetEscapeNonPrintables());
405   SetBinaryZeroIsTerminator(options.GetBinaryZeroIsTerminator());
406   SetLanguage(options.GetLanguage());
407 }
408 
409 namespace lldb_private {
410 
411 namespace formatters {
412 
413 template <>
414 bool StringPrinter::ReadStringAndDumpToStream<
415     StringPrinter::StringElementType::ASCII>(
416     const ReadStringAndDumpToStreamOptions &options) {
417   assert(options.GetStream() && "need a Stream to print the string to");
418   Status my_error;
419 
420   ProcessSP process_sp(options.GetProcessSP());
421 
422   if (process_sp.get() == nullptr || options.GetLocation() == 0)
423     return false;
424 
425   size_t size;
426   const auto max_size = process_sp->GetTarget().GetMaximumSizeOfStringSummary();
427   bool is_truncated = false;
428 
429   if (options.GetSourceSize() == 0)
430     size = max_size;
431   else if (!options.GetIgnoreMaxLength()) {
432     size = options.GetSourceSize();
433     if (size > max_size) {
434       size = max_size;
435       is_truncated = true;
436     }
437   } else
438     size = options.GetSourceSize();
439 
440   lldb::DataBufferSP buffer_sp(new DataBufferHeap(size, 0));
441 
442   process_sp->ReadCStringFromMemory(
443       options.GetLocation(), (char *)buffer_sp->GetBytes(), size, my_error);
444 
445   if (my_error.Fail())
446     return false;
447 
448   const char *prefix_token = options.GetPrefixToken();
449   char quote = options.GetQuote();
450 
451   if (prefix_token != 0)
452     options.GetStream()->Printf("%s%c", prefix_token, quote);
453   else if (quote != 0)
454     options.GetStream()->Printf("%c", quote);
455 
456   uint8_t *data_end = buffer_sp->GetBytes() + buffer_sp->GetByteSize();
457 
458   const bool escape_non_printables = options.GetEscapeNonPrintables();
459   lldb_private::formatters::StringPrinter::EscapingHelper escaping_callback;
460   if (escape_non_printables) {
461     if (Language *language = Language::FindPlugin(options.GetLanguage()))
462       escaping_callback = language->GetStringPrinterEscapingHelper(
463           lldb_private::formatters::StringPrinter::GetPrintableElementType::
464               ASCII);
465     else
466       escaping_callback =
467           lldb_private::formatters::StringPrinter::GetDefaultEscapingHelper(
468               lldb_private::formatters::StringPrinter::GetPrintableElementType::
469                   ASCII);
470   }
471 
472   // since we tend to accept partial data (and even partially malformed data)
473   // we might end up with no NULL terminator before the end_ptr hence we need
474   // to take a slower route and ensure we stay within boundaries
475   for (uint8_t *data = buffer_sp->GetBytes(); *data && (data < data_end);) {
476     if (escape_non_printables) {
477       uint8_t *next_data = nullptr;
478       auto printable = escaping_callback(data, data_end, next_data);
479       auto printable_bytes = printable.GetBytes();
480       auto printable_size = printable.GetSize();
481       if (!printable_bytes || !next_data) {
482         // GetPrintable() failed on us - print one byte in a desperate resync
483         // attempt
484         printable_bytes = data;
485         printable_size = 1;
486         next_data = data + 1;
487       }
488       for (unsigned c = 0; c < printable_size; c++)
489         options.GetStream()->Printf("%c", *(printable_bytes + c));
490       data = (uint8_t *)next_data;
491     } else {
492       options.GetStream()->Printf("%c", *data);
493       data++;
494     }
495   }
496 
497   const char *suffix_token = options.GetSuffixToken();
498 
499   if (suffix_token != 0)
500     options.GetStream()->Printf("%c%s", quote, suffix_token);
501   else if (quote != 0)
502     options.GetStream()->Printf("%c", quote);
503 
504   if (is_truncated)
505     options.GetStream()->Printf("...");
506 
507   return true;
508 }
509 
510 template <typename SourceDataType>
511 static bool ReadUTFBufferAndDumpToStream(
512     const StringPrinter::ReadStringAndDumpToStreamOptions &options,
513     llvm::ConversionResult (*ConvertFunction)(const SourceDataType **,
514                                               const SourceDataType *,
515                                               llvm::UTF8 **, llvm::UTF8 *,
516                                               llvm::ConversionFlags)) {
517   assert(options.GetStream() && "need a Stream to print the string to");
518 
519   if (options.GetLocation() == 0 ||
520       options.GetLocation() == LLDB_INVALID_ADDRESS)
521     return false;
522 
523   lldb::ProcessSP process_sp(options.GetProcessSP());
524 
525   if (!process_sp)
526     return false;
527 
528   const int type_width = sizeof(SourceDataType);
529   const int origin_encoding = 8 * type_width;
530   if (origin_encoding != 8 && origin_encoding != 16 && origin_encoding != 32)
531     return false;
532   // if not UTF8, I need a conversion function to return proper UTF8
533   if (origin_encoding != 8 && !ConvertFunction)
534     return false;
535 
536   if (!options.GetStream())
537     return false;
538 
539   uint32_t sourceSize = options.GetSourceSize();
540   bool needs_zero_terminator = options.GetNeedsZeroTermination();
541 
542   bool is_truncated = false;
543   const auto max_size = process_sp->GetTarget().GetMaximumSizeOfStringSummary();
544 
545   if (!sourceSize) {
546     sourceSize = max_size;
547     needs_zero_terminator = true;
548   } else if (!options.GetIgnoreMaxLength()) {
549     if (sourceSize > max_size) {
550       sourceSize = max_size;
551       is_truncated = true;
552     }
553   }
554 
555   const int bufferSPSize = sourceSize * type_width;
556 
557   lldb::DataBufferSP buffer_sp(new DataBufferHeap(bufferSPSize, 0));
558 
559   if (!buffer_sp->GetBytes())
560     return false;
561 
562   Status error;
563   char *buffer = reinterpret_cast<char *>(buffer_sp->GetBytes());
564 
565   if (needs_zero_terminator)
566     process_sp->ReadStringFromMemory(options.GetLocation(), buffer,
567                                      bufferSPSize, error, type_width);
568   else
569     process_sp->ReadMemoryFromInferior(options.GetLocation(),
570                                        (char *)buffer_sp->GetBytes(),
571                                        bufferSPSize, error);
572 
573   if (error.Fail()) {
574     options.GetStream()->Printf("unable to read data");
575     return true;
576   }
577 
578   DataExtractor data(buffer_sp, process_sp->GetByteOrder(),
579                      process_sp->GetAddressByteSize());
580 
581   StringPrinter::ReadBufferAndDumpToStreamOptions dump_options(options);
582   dump_options.SetData(data);
583   dump_options.SetSourceSize(sourceSize);
584   dump_options.SetIsTruncated(is_truncated);
585 
586   return DumpUTFBufferToStream(ConvertFunction, dump_options);
587 }
588 
589 template <>
590 bool StringPrinter::ReadStringAndDumpToStream<
591     StringPrinter::StringElementType::UTF8>(
592     const ReadStringAndDumpToStreamOptions &options) {
593   return ReadUTFBufferAndDumpToStream<llvm::UTF8>(options, nullptr);
594 }
595 
596 template <>
597 bool StringPrinter::ReadStringAndDumpToStream<
598     StringPrinter::StringElementType::UTF16>(
599     const ReadStringAndDumpToStreamOptions &options) {
600   return ReadUTFBufferAndDumpToStream<llvm::UTF16>(options,
601                                                    llvm::ConvertUTF16toUTF8);
602 }
603 
604 template <>
605 bool StringPrinter::ReadStringAndDumpToStream<
606     StringPrinter::StringElementType::UTF32>(
607     const ReadStringAndDumpToStreamOptions &options) {
608   return ReadUTFBufferAndDumpToStream<llvm::UTF32>(options,
609                                                    llvm::ConvertUTF32toUTF8);
610 }
611 
612 template <>
613 bool StringPrinter::ReadBufferAndDumpToStream<
614     StringPrinter::StringElementType::UTF8>(
615     const ReadBufferAndDumpToStreamOptions &options) {
616   assert(options.GetStream() && "need a Stream to print the string to");
617 
618   return DumpUTFBufferToStream<llvm::UTF8>(nullptr, options);
619 }
620 
621 template <>
622 bool StringPrinter::ReadBufferAndDumpToStream<
623     StringPrinter::StringElementType::ASCII>(
624     const ReadBufferAndDumpToStreamOptions &options) {
625   // treat ASCII the same as UTF8
626   // FIXME: can we optimize ASCII some more?
627   return ReadBufferAndDumpToStream<StringElementType::UTF8>(options);
628 }
629 
630 template <>
631 bool StringPrinter::ReadBufferAndDumpToStream<
632     StringPrinter::StringElementType::UTF16>(
633     const ReadBufferAndDumpToStreamOptions &options) {
634   assert(options.GetStream() && "need a Stream to print the string to");
635 
636   return DumpUTFBufferToStream(llvm::ConvertUTF16toUTF8, options);
637 }
638 
639 template <>
640 bool StringPrinter::ReadBufferAndDumpToStream<
641     StringPrinter::StringElementType::UTF32>(
642     const ReadBufferAndDumpToStreamOptions &options) {
643   assert(options.GetStream() && "need a Stream to print the string to");
644 
645   return DumpUTFBufferToStream(llvm::ConvertUTF32toUTF8, options);
646 }
647 
648 } // namespace formatters
649 
650 } // namespace lldb_private
651