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hanchenye-llvm-project/lldb/source/DataFormatters/StringPrinter.cpp

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//===-- StringPrinter.cpp ----------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/DataFormatters/StringPrinter.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Error.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Target/Language.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "llvm/Support/ConvertUTF.h"
#include <ctype.h>
#include <locale>
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
// we define this for all values of type but only implement it for those we care about
// that's good because we get linker errors for any unsupported type
template <lldb_private::formatters::StringPrinter::StringElementType type>
static StringPrinter::StringPrinterBufferPointer<>
GetPrintableImpl(uint8_t* buffer, uint8_t* buffer_end, uint8_t*& next);
// mimic isprint() for Unicode codepoints
static bool
isprint(char32_t codepoint)
{
if (codepoint <= 0x1F || codepoint == 0x7F) // C0
{
return false;
}
if (codepoint >= 0x80 && codepoint <= 0x9F) // C1
{
return false;
}
if (codepoint == 0x2028 || codepoint == 0x2029) // line/paragraph separators
{
return false;
}
if (codepoint == 0x200E || codepoint == 0x200F || (codepoint >= 0x202A && codepoint <= 0x202E)) // bidirectional text control
{
return false;
}
if (codepoint >= 0xFFF9 && codepoint <= 0xFFFF) // interlinears and generally specials
{
return false;
}
return true;
}
template <>
StringPrinter::StringPrinterBufferPointer<>
GetPrintableImpl<StringPrinter::StringElementType::ASCII> (uint8_t* buffer, uint8_t* buffer_end, uint8_t*& next)
{
StringPrinter::StringPrinterBufferPointer<> retval = {nullptr};
switch (*buffer)
{
case 0:
retval = {"\\0",2};
break;
case '\a':
retval = {"\\a",2};
break;
case '\b':
retval = {"\\b",2};
break;
case '\f':
retval = {"\\f",2};
break;
case '\n':
retval = {"\\n",2};
break;
case '\r':
retval = {"\\r",2};
break;
case '\t':
retval = {"\\t",2};
break;
case '\v':
retval = {"\\v",2};
break;
case '\"':
retval = {"\\\"",2};
break;
case '\\':
retval = {"\\\\",2};
break;
default:
if (isprint(*buffer))
retval = {buffer,1};
else
{
uint8_t* data = new uint8_t[5];
sprintf((char*)data,"\\x%02x",*buffer);
retval = {data, 4, [] (const uint8_t* c) {delete[] c;} };
break;
}
}
next = buffer + 1;
return retval;
}
static char32_t
ConvertUTF8ToCodePoint (unsigned char c0, unsigned char c1)
{
return (c0-192)*64+(c1-128);
}
static char32_t
ConvertUTF8ToCodePoint (unsigned char c0, unsigned char c1, unsigned char c2)
{
return (c0-224)*4096+(c1-128)*64+(c2-128);
}
static char32_t
ConvertUTF8ToCodePoint (unsigned char c0, unsigned char c1, unsigned char c2, unsigned char c3)
{
return (c0-240)*262144+(c2-128)*4096+(c2-128)*64+(c3-128);
}
template <>
StringPrinter::StringPrinterBufferPointer<>
GetPrintableImpl<StringPrinter::StringElementType::UTF8> (uint8_t* buffer, uint8_t* buffer_end, uint8_t*& next)
{
StringPrinter::StringPrinterBufferPointer<> retval {nullptr};
unsigned utf8_encoded_len = getNumBytesForUTF8(*buffer);
if (1+buffer_end-buffer < utf8_encoded_len)
{
// I don't have enough bytes - print whatever I have left
retval = {buffer,static_cast<size_t>(1+buffer_end-buffer)};
next = buffer_end+1;
return retval;
}
char32_t codepoint = 0;
switch (utf8_encoded_len)
{
case 1:
// this is just an ASCII byte - ask ASCII
return GetPrintableImpl<StringPrinter::StringElementType::ASCII>(buffer, buffer_end, next);
case 2:
codepoint = ConvertUTF8ToCodePoint((unsigned char)*buffer, (unsigned char)*(buffer+1));
break;
case 3:
codepoint = ConvertUTF8ToCodePoint((unsigned char)*buffer, (unsigned char)*(buffer+1), (unsigned char)*(buffer+2));
break;
case 4:
codepoint = ConvertUTF8ToCodePoint((unsigned char)*buffer, (unsigned char)*(buffer+1), (unsigned char)*(buffer+2), (unsigned char)*(buffer+3));
break;
default:
// this is probably some bogus non-character thing
// just print it as-is and hope to sync up again soon
retval = {buffer,1};
next = buffer+1;
return retval;
}
if (codepoint)
{
switch (codepoint)
{
case 0:
retval = {"\\0",2};
break;
case '\a':
retval = {"\\a",2};
break;
case '\b':
retval = {"\\b",2};
break;
case '\f':
retval = {"\\f",2};
break;
case '\n':
retval = {"\\n",2};
break;
case '\r':
retval = {"\\r",2};
break;
case '\t':
retval = {"\\t",2};
break;
case '\v':
retval = {"\\v",2};
break;
case '\"':
retval = {"\\\"",2};
break;
case '\\':
retval = {"\\\\",2};
break;
default:
if (isprint(codepoint))
retval = {buffer,utf8_encoded_len};
else
{
uint8_t* data = new uint8_t[11];
sprintf((char *)data, "\\U%08x", (unsigned)codepoint);
retval = { data,10,[] (const uint8_t* c) {delete[] c;} };
break;
}
}
next = buffer + utf8_encoded_len;
return retval;
}
// this should not happen - but just in case.. try to resync at some point
retval = {buffer,1};
next = buffer+1;
return retval;
}
// Given a sequence of bytes, this function returns:
// a sequence of bytes to actually print out + a length
// the following unscanned position of the buffer is in next
static StringPrinter::StringPrinterBufferPointer<>
GetPrintable(StringPrinter::StringElementType type, uint8_t* buffer, uint8_t* buffer_end, uint8_t*& next)
{
if (!buffer)
return {nullptr};
switch (type)
{
case StringPrinter::StringElementType::ASCII:
return GetPrintableImpl<StringPrinter::StringElementType::ASCII>(buffer, buffer_end, next);
case StringPrinter::StringElementType::UTF8:
return GetPrintableImpl<StringPrinter::StringElementType::UTF8>(buffer, buffer_end, next);
default:
return {nullptr};
}
}
StringPrinter::EscapingHelper
StringPrinter::GetDefaultEscapingHelper (GetPrintableElementType elem_type)
{
switch (elem_type)
{
case GetPrintableElementType::UTF8:
return [] (uint8_t* buffer, uint8_t* buffer_end, uint8_t*& next) -> StringPrinter::StringPrinterBufferPointer<> {
return GetPrintable(StringPrinter::StringElementType::UTF8, buffer, buffer_end, next);
};
case GetPrintableElementType::ASCII:
return [] (uint8_t* buffer, uint8_t* buffer_end, uint8_t*& next) -> StringPrinter::StringPrinterBufferPointer<> {
return GetPrintable(StringPrinter::StringElementType::ASCII, buffer, buffer_end, next);
};
}
llvm_unreachable("bad element type");
}
// use this call if you already have an LLDB-side buffer for the data
template<typename SourceDataType>
static bool
DumpUTFBufferToStream (ConversionResult (*ConvertFunction) (const SourceDataType**,
const SourceDataType*,
UTF8**,
UTF8*,
ConversionFlags),
const StringPrinter::ReadBufferAndDumpToStreamOptions& dump_options)
{
Stream &stream(*dump_options.GetStream());
if (dump_options.GetPrefixToken() != 0)
stream.Printf("%s",dump_options.GetPrefixToken());
if (dump_options.GetQuote() != 0)
stream.Printf("%c",dump_options.GetQuote());
auto data(dump_options.GetData());
auto source_size(dump_options.GetSourceSize());
if (data.GetByteSize() && data.GetDataStart() && data.GetDataEnd())
{
const int bufferSPSize = data.GetByteSize();
if (dump_options.GetSourceSize() == 0)
{
const int origin_encoding = 8*sizeof(SourceDataType);
source_size = bufferSPSize/(origin_encoding / 4);
}
const SourceDataType *data_ptr = (const SourceDataType*)data.GetDataStart();
const SourceDataType *data_end_ptr = data_ptr + source_size;
const bool zero_is_terminator = dump_options.GetBinaryZeroIsTerminator();
if (zero_is_terminator)
{
while (data_ptr < data_end_ptr)
{
if (!*data_ptr)
{
data_end_ptr = data_ptr;
break;
}
data_ptr++;
}
data_ptr = (const SourceDataType*)data.GetDataStart();
}
lldb::DataBufferSP utf8_data_buffer_sp;
UTF8* utf8_data_ptr = nullptr;
UTF8* utf8_data_end_ptr = nullptr;
if (ConvertFunction)
{
utf8_data_buffer_sp.reset(new DataBufferHeap(4*bufferSPSize,0));
utf8_data_ptr = (UTF8*)utf8_data_buffer_sp->GetBytes();
utf8_data_end_ptr = utf8_data_ptr + utf8_data_buffer_sp->GetByteSize();
ConvertFunction ( &data_ptr, data_end_ptr, &utf8_data_ptr, utf8_data_end_ptr, lenientConversion );
if (false == zero_is_terminator)
utf8_data_end_ptr = utf8_data_ptr;
utf8_data_ptr = (UTF8*)utf8_data_buffer_sp->GetBytes(); // needed because the ConvertFunction will change the value of the data_ptr
}
else
{
// just copy the pointers - the cast is necessary to make the compiler happy
// but this should only happen if we are reading UTF8 data
utf8_data_ptr = const_cast<UTF8 *>(reinterpret_cast<const UTF8*>(data_ptr));
utf8_data_end_ptr = const_cast<UTF8 *>(reinterpret_cast<const UTF8*>(data_end_ptr));
}
const bool escape_non_printables = dump_options.GetEscapeNonPrintables();
lldb_private::formatters::StringPrinter::EscapingHelper escaping_callback;
if (escape_non_printables)
{
if (Language *language = Language::FindPlugin(dump_options.GetLanguage()))
escaping_callback = language->GetStringPrinterEscapingHelper(lldb_private::formatters::StringPrinter::GetPrintableElementType::UTF8);
else
escaping_callback = lldb_private::formatters::StringPrinter::GetDefaultEscapingHelper(lldb_private::formatters::StringPrinter::GetPrintableElementType::UTF8);
}
// since we tend to accept partial data (and even partially malformed data)
// we might end up with no NULL terminator before the end_ptr
// hence we need to take a slower route and ensure we stay within boundaries
for (;utf8_data_ptr < utf8_data_end_ptr;)
{
if (zero_is_terminator && !*utf8_data_ptr)
break;
if (escape_non_printables)
{
uint8_t* next_data = nullptr;
auto printable = escaping_callback(utf8_data_ptr, utf8_data_end_ptr, next_data);
auto printable_bytes = printable.GetBytes();
auto printable_size = printable.GetSize();
if (!printable_bytes || !next_data)
{
// GetPrintable() failed on us - print one byte in a desperate resync attempt
printable_bytes = utf8_data_ptr;
printable_size = 1;
next_data = utf8_data_ptr+1;
}
for (unsigned c = 0; c < printable_size; c++)
stream.Printf("%c", *(printable_bytes+c));
utf8_data_ptr = (uint8_t*)next_data;
}
else
{
stream.Printf("%c",*utf8_data_ptr);
utf8_data_ptr++;
}
}
}
if (dump_options.GetQuote() != 0)
stream.Printf("%c",dump_options.GetQuote());
if (dump_options.GetSuffixToken() != 0)
stream.Printf("%s",dump_options.GetSuffixToken());
if (dump_options.GetIsTruncated())
stream.Printf("...");
return true;
}
lldb_private::formatters::StringPrinter::ReadStringAndDumpToStreamOptions::ReadStringAndDumpToStreamOptions (ValueObject& valobj) :
ReadStringAndDumpToStreamOptions()
{
SetEscapeNonPrintables(valobj.GetTargetSP()->GetDebugger().GetEscapeNonPrintables());
}
lldb_private::formatters::StringPrinter::ReadBufferAndDumpToStreamOptions::ReadBufferAndDumpToStreamOptions (ValueObject& valobj) :
ReadBufferAndDumpToStreamOptions()
{
SetEscapeNonPrintables(valobj.GetTargetSP()->GetDebugger().GetEscapeNonPrintables());
}
lldb_private::formatters::StringPrinter::ReadBufferAndDumpToStreamOptions::ReadBufferAndDumpToStreamOptions (const ReadStringAndDumpToStreamOptions& options) :
ReadBufferAndDumpToStreamOptions()
{
SetStream(options.GetStream());
SetPrefixToken(options.GetPrefixToken());
SetSuffixToken(options.GetSuffixToken());
SetQuote(options.GetQuote());
SetEscapeNonPrintables(options.GetEscapeNonPrintables());
SetBinaryZeroIsTerminator(options.GetBinaryZeroIsTerminator());
SetLanguage(options.GetLanguage());
}
namespace lldb_private
{
namespace formatters
{
template <>
bool
StringPrinter::ReadStringAndDumpToStream<StringPrinter::StringElementType::ASCII> (const ReadStringAndDumpToStreamOptions& options)
{
assert(options.GetStream() && "need a Stream to print the string to");
Error my_error;
ProcessSP process_sp(options.GetProcessSP());
if (process_sp.get() == nullptr || options.GetLocation() == 0)
return false;
size_t size;
const auto max_size = process_sp->GetTarget().GetMaximumSizeOfStringSummary();
bool is_truncated = false;
if (options.GetSourceSize() == 0)
size = max_size;
else if (!options.GetIgnoreMaxLength())
{
size = options.GetSourceSize();
if (size > max_size)
{
size = max_size;
is_truncated = true;
}
}
else
size = options.GetSourceSize();
lldb::DataBufferSP buffer_sp(new DataBufferHeap(size,0));
process_sp->ReadCStringFromMemory(options.GetLocation(), (char*)buffer_sp->GetBytes(), size, my_error);
if (my_error.Fail())
return false;
const char* prefix_token = options.GetPrefixToken();
char quote = options.GetQuote();
if (prefix_token != 0)
options.GetStream()->Printf("%s%c",prefix_token,quote);
else if (quote != 0)
options.GetStream()->Printf("%c",quote);
uint8_t* data_end = buffer_sp->GetBytes()+buffer_sp->GetByteSize();
const bool escape_non_printables = options.GetEscapeNonPrintables();
lldb_private::formatters::StringPrinter::EscapingHelper escaping_callback;
if (escape_non_printables)
{
if (Language *language = Language::FindPlugin(options.GetLanguage()))
escaping_callback = language->GetStringPrinterEscapingHelper(lldb_private::formatters::StringPrinter::GetPrintableElementType::ASCII);
else
escaping_callback = lldb_private::formatters::StringPrinter::GetDefaultEscapingHelper(lldb_private::formatters::StringPrinter::GetPrintableElementType::ASCII);
}
// since we tend to accept partial data (and even partially malformed data)
// we might end up with no NULL terminator before the end_ptr
// hence we need to take a slower route and ensure we stay within boundaries
for (uint8_t* data = buffer_sp->GetBytes(); *data && (data < data_end);)
{
if (escape_non_printables)
{
uint8_t* next_data = nullptr;
auto printable = escaping_callback(data, data_end, next_data);
auto printable_bytes = printable.GetBytes();
auto printable_size = printable.GetSize();
if (!printable_bytes || !next_data)
{
// GetPrintable() failed on us - print one byte in a desperate resync attempt
printable_bytes = data;
printable_size = 1;
next_data = data+1;
}
for (unsigned c = 0; c < printable_size; c++)
options.GetStream()->Printf("%c", *(printable_bytes+c));
data = (uint8_t*)next_data;
}
else
{
options.GetStream()->Printf("%c",*data);
data++;
}
}
const char* suffix_token = options.GetSuffixToken();
if (suffix_token != 0)
options.GetStream()->Printf("%c%s",quote, suffix_token);
else if (quote != 0)
options.GetStream()->Printf("%c",quote);
if (is_truncated)
options.GetStream()->Printf("...");
return true;
}
template<typename SourceDataType>
static bool
ReadUTFBufferAndDumpToStream (const StringPrinter::ReadStringAndDumpToStreamOptions& options,
ConversionResult (*ConvertFunction) (const SourceDataType**,
const SourceDataType*,
UTF8**,
UTF8*,
ConversionFlags))
{
assert(options.GetStream() && "need a Stream to print the string to");
if (options.GetLocation() == 0 || options.GetLocation() == LLDB_INVALID_ADDRESS)
return false;
lldb::ProcessSP process_sp(options.GetProcessSP());
if (!process_sp)
return false;
const int type_width = sizeof(SourceDataType);
const int origin_encoding = 8 * type_width ;
if (origin_encoding != 8 && origin_encoding != 16 && origin_encoding != 32)
return false;
// if not UTF8, I need a conversion function to return proper UTF8
if (origin_encoding != 8 && !ConvertFunction)
return false;
if (!options.GetStream())
return false;
uint32_t sourceSize = options.GetSourceSize();
bool needs_zero_terminator = options.GetNeedsZeroTermination();
bool is_truncated = false;
const auto max_size = process_sp->GetTarget().GetMaximumSizeOfStringSummary();
if (!sourceSize)
{
sourceSize = max_size;
needs_zero_terminator = true;
}
else if (!options.GetIgnoreMaxLength())
{
if (sourceSize > max_size)
{
sourceSize = max_size;
is_truncated = true;
}
}
const int bufferSPSize = sourceSize * type_width;
lldb::DataBufferSP buffer_sp(new DataBufferHeap(bufferSPSize,0));
if (!buffer_sp->GetBytes())
return false;
Error error;
char *buffer = reinterpret_cast<char *>(buffer_sp->GetBytes());
if (needs_zero_terminator)
process_sp->ReadStringFromMemory(options.GetLocation(), buffer, bufferSPSize, error, type_width);
else
process_sp->ReadMemoryFromInferior(options.GetLocation(), (char*)buffer_sp->GetBytes(), bufferSPSize, error);
if (error.Fail())
{
options.GetStream()->Printf("unable to read data");
return true;
}
DataExtractor data(buffer_sp, process_sp->GetByteOrder(), process_sp->GetAddressByteSize());
StringPrinter::ReadBufferAndDumpToStreamOptions dump_options(options);
dump_options.SetData(data);
dump_options.SetSourceSize(sourceSize);
dump_options.SetIsTruncated(is_truncated);
return DumpUTFBufferToStream(ConvertFunction, dump_options);
}
template <>
bool
StringPrinter::ReadStringAndDumpToStream<StringPrinter::StringElementType::UTF8> (const ReadStringAndDumpToStreamOptions& options)
{
return ReadUTFBufferAndDumpToStream<UTF8>(options,
nullptr);
}
template <>
bool
StringPrinter::ReadStringAndDumpToStream<StringPrinter::StringElementType::UTF16> (const ReadStringAndDumpToStreamOptions& options)
{
return ReadUTFBufferAndDumpToStream<UTF16>(options,
ConvertUTF16toUTF8);
}
template <>
bool
StringPrinter::ReadStringAndDumpToStream<StringPrinter::StringElementType::UTF32> (const ReadStringAndDumpToStreamOptions& options)
{
return ReadUTFBufferAndDumpToStream<UTF32>(options,
ConvertUTF32toUTF8);
}
template <>
bool
StringPrinter::ReadBufferAndDumpToStream<StringPrinter::StringElementType::UTF8> (const ReadBufferAndDumpToStreamOptions& options)
{
assert(options.GetStream() && "need a Stream to print the string to");
return DumpUTFBufferToStream<UTF8>(nullptr, options);
}
template <>
bool
StringPrinter::ReadBufferAndDumpToStream<StringPrinter::StringElementType::ASCII> (const ReadBufferAndDumpToStreamOptions& options)
{
// treat ASCII the same as UTF8
// FIXME: can we optimize ASCII some more?
return ReadBufferAndDumpToStream<StringElementType::UTF8>(options);
}
template <>
bool
StringPrinter::ReadBufferAndDumpToStream<StringPrinter::StringElementType::UTF16> (const ReadBufferAndDumpToStreamOptions& options)
{
assert(options.GetStream() && "need a Stream to print the string to");
return DumpUTFBufferToStream(ConvertUTF16toUTF8, options);
}
template <>
bool
StringPrinter::ReadBufferAndDumpToStream<StringPrinter::StringElementType::UTF32> (const ReadBufferAndDumpToStreamOptions& options)
{
assert(options.GetStream() && "need a Stream to print the string to");
return DumpUTFBufferToStream(ConvertUTF32toUTF8, options);
}
} // namespace formatters
} // namespace lldb_private
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