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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/DataExtractor.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Error.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "llvm/Support/ConvertUTF.h"
#include <ctype.h>
#include <functional>
#include <locale>
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
// I can't use a std::unique_ptr for this because the Deleter is a template argument there
// and I want the same type to represent both pointers I want to free and pointers I don't need
// to free - which is what this class essentially is
// It's very specialized to the needs of this file, and not suggested for general use
template <typename T = uint8_t, typename U = char, typename S = size_t>
struct StringPrinterBufferPointer
{
public:
typedef std::function<void(const T*)> Deleter;
StringPrinterBufferPointer (std::nullptr_t ptr) :
m_data(nullptr),
m_size(0),
m_deleter()
{}
StringPrinterBufferPointer(const T* bytes, S size, Deleter deleter = nullptr) :
m_data(bytes),
m_size(size),
m_deleter(deleter)
{}
StringPrinterBufferPointer(const U* bytes, S size, Deleter deleter = nullptr) :
m_data((T*)bytes),
m_size(size),
m_deleter(deleter)
{}
StringPrinterBufferPointer(StringPrinterBufferPointer&& rhs) :
m_data(rhs.m_data),
m_size(rhs.m_size),
m_deleter(rhs.m_deleter)
{
rhs.m_data = nullptr;
}
StringPrinterBufferPointer(const StringPrinterBufferPointer& rhs) :
m_data(rhs.m_data),
m_size(rhs.m_size),
m_deleter(rhs.m_deleter)
{
rhs.m_data = nullptr; // this is why m_data has to be mutable
}
const T*
GetBytes () const
{
return m_data;
}
const S
GetSize () const
{
return m_size;
}
~StringPrinterBufferPointer ()
{
if (m_data && m_deleter)
m_deleter(m_data);
m_data = nullptr;
}
StringPrinterBufferPointer&
operator = (const StringPrinterBufferPointer& rhs)
{
if (m_data && m_deleter)
m_deleter(m_data);
m_data = rhs.m_data;
m_size = rhs.m_size;
m_deleter = rhs.m_deleter;
rhs.m_data = nullptr;
return *this;
}
private:
mutable const T* m_data;
size_t m_size;
Deleter m_deleter;
};
// 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 <StringElementType type>
static 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 <>
StringPrinterBufferPointer<>
GetPrintableImpl<StringElementType::ASCII> (uint8_t* buffer, uint8_t* buffer_end, uint8_t*& next)
{
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
{
retval = { new uint8_t[5],4,[] (const uint8_t* c) {delete[] c;} };
sprintf((char*)retval.GetBytes(),"\\x%02x",*buffer);
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 <>
StringPrinterBufferPointer<>
GetPrintableImpl<StringElementType::UTF8> (uint8_t* buffer, uint8_t* buffer_end, uint8_t*& next)
{
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<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
{
retval = { new uint8_t[11],10,[] (const uint8_t* c) {delete[] c;} };
sprintf((char*)retval.GetBytes(),"\\U%08x",codepoint);
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 StringPrinterBufferPointer<>
GetPrintable(StringElementType type, uint8_t* buffer, uint8_t* buffer_end, uint8_t*& next)
{
if (!buffer)
return {nullptr};
switch (type)
{
case StringElementType::ASCII:
return GetPrintableImpl<StringElementType::ASCII>(buffer, buffer_end, next);
case StringElementType::UTF8:
return GetPrintableImpl<StringElementType::UTF8>(buffer, buffer_end, next);
default:
return {nullptr};
}
}
// 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 DataExtractor& data,
Stream& stream,
char prefix_token,
char quote,
uint32_t sourceSize,
bool escapeNonPrintables)
{
if (prefix_token != 0)
stream.Printf("%c",prefix_token);
if (quote != 0)
stream.Printf("%c",quote);
if (data.GetByteSize() && data.GetDataStart() && data.GetDataEnd())
{
const int bufferSPSize = data.GetByteSize();
if (sourceSize == 0)
{
const int origin_encoding = 8*sizeof(SourceDataType);
sourceSize = bufferSPSize/(origin_encoding / 4);
}
SourceDataType *data_ptr = (SourceDataType*)data.GetDataStart();
SourceDataType *data_end_ptr = data_ptr + sourceSize;
while (data_ptr < data_end_ptr)
{
if (!*data_ptr)
{
data_end_ptr = data_ptr;
break;
}
data_ptr++;
}
data_ptr = (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 ( (const SourceDataType**)&data_ptr, data_end_ptr, &utf8_data_ptr, utf8_data_end_ptr, lenientConversion );
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 = (UTF8*)data_ptr;
utf8_data_end_ptr = (UTF8*)data_end_ptr;
}
// 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 (!*utf8_data_ptr)
break;
if (escapeNonPrintables)
{
uint8_t* next_data = nullptr;
auto printable = GetPrintable(StringElementType::UTF8, 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 (quote != 0)
stream.Printf("%c",quote);
return true;
}
lldb_private::formatters::ReadStringAndDumpToStreamOptions::ReadStringAndDumpToStreamOptions (ValueObject& valobj) :
ReadStringAndDumpToStreamOptions()
{
SetEscapeNonPrintables(valobj.GetTargetSP()->GetDebugger().GetEscapeNonPrintables());
}
lldb_private::formatters::ReadBufferAndDumpToStreamOptions::ReadBufferAndDumpToStreamOptions (ValueObject& valobj) :
ReadBufferAndDumpToStreamOptions()
{
SetEscapeNonPrintables(valobj.GetTargetSP()->GetDebugger().GetEscapeNonPrintables());
}
namespace lldb_private
{
namespace formatters
{
template <>
bool
ReadStringAndDumpToStream<StringElementType::ASCII> (ReadStringAndDumpToStreamOptions options)
{
assert(options.GetStream() && "need a Stream to print the string to");
Error my_error;
size_t my_data_read;
ProcessSP process_sp(options.GetProcessSP());
if (process_sp.get() == nullptr || options.GetLocation() == 0)
return false;
size_t size;
if (options.GetSourceSize() == 0)
size = process_sp->GetTarget().GetMaximumSizeOfStringSummary();
else if (!options.GetIgnoreMaxLength())
size = std::min(options.GetSourceSize(),process_sp->GetTarget().GetMaximumSizeOfStringSummary());
else
size = options.GetSourceSize();
lldb::DataBufferSP buffer_sp(new DataBufferHeap(size,0));
my_data_read = process_sp->ReadCStringFromMemory(options.GetLocation(), (char*)buffer_sp->GetBytes(), size, my_error);
if (my_error.Fail())
return false;
char prefix_token = options.GetPrefixToken();
char quote = options.GetQuote();
if (prefix_token != 0)
options.GetStream()->Printf("%c%c",prefix_token,quote);
else if (quote != 0)
options.GetStream()->Printf("%c",quote);
uint8_t* data_end = buffer_sp->GetBytes()+buffer_sp->GetByteSize();
// 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 (options.GetEscapeNonPrintables())
{
uint8_t* next_data = nullptr;
auto printable = GetPrintable(StringElementType::ASCII, 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++;
}
}
if (quote != 0)
options.GetStream()->Printf("%c",quote);
return true;
}
template<typename SourceDataType>
static bool
ReadUTFBufferAndDumpToStream (const 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();
if (!sourceSize)
{
sourceSize = process_sp->GetTarget().GetMaximumSizeOfStringSummary();
needs_zero_terminator = true;
}
else
sourceSize = std::min(sourceSize,process_sp->GetTarget().GetMaximumSizeOfStringSummary());
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());
size_t data_read = 0;
if (needs_zero_terminator)
data_read = process_sp->ReadStringFromMemory(options.GetLocation(), buffer, bufferSPSize, error, type_width);
else
data_read = 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());
return DumpUTFBufferToStream(ConvertFunction, data, *options.GetStream(), options.GetPrefixToken(), options.GetQuote(), sourceSize, options.GetEscapeNonPrintables());
}
template <>
bool
ReadStringAndDumpToStream<StringElementType::UTF8> (ReadStringAndDumpToStreamOptions options)
{
return ReadUTFBufferAndDumpToStream<UTF8>(options,
nullptr);
}
template <>
bool
ReadStringAndDumpToStream<StringElementType::UTF16> (ReadStringAndDumpToStreamOptions options)
{
return ReadUTFBufferAndDumpToStream<UTF16>(options,
ConvertUTF16toUTF8);
}
template <>
bool
ReadStringAndDumpToStream<StringElementType::UTF32> (ReadStringAndDumpToStreamOptions options)
{
return ReadUTFBufferAndDumpToStream<UTF32>(options,
ConvertUTF32toUTF8);
}
template <>
bool
ReadBufferAndDumpToStream<StringElementType::UTF8> (ReadBufferAndDumpToStreamOptions options)
{
assert(options.GetStream() && "need a Stream to print the string to");
return DumpUTFBufferToStream<UTF8>(nullptr, options.GetData(), *options.GetStream(), options.GetPrefixToken(), options.GetQuote(), options.GetSourceSize(), options.GetEscapeNonPrintables());
}
template <>
bool
ReadBufferAndDumpToStream<StringElementType::ASCII> (ReadBufferAndDumpToStreamOptions options)
{
// treat ASCII the same as UTF8
// FIXME: can we optimize ASCII some more?
return ReadBufferAndDumpToStream<StringElementType::UTF8>(options);
}
template <>
bool
ReadBufferAndDumpToStream<StringElementType::UTF16> (ReadBufferAndDumpToStreamOptions options)
{
assert(options.GetStream() && "need a Stream to print the string to");
return DumpUTFBufferToStream(ConvertUTF16toUTF8, options.GetData(), *options.GetStream(), options.GetPrefixToken(), options.GetQuote(), options.GetSourceSize(), options.GetEscapeNonPrintables());
}
template <>
bool
ReadBufferAndDumpToStream<StringElementType::UTF32> (ReadBufferAndDumpToStreamOptions options)
{
assert(options.GetStream() && "need a Stream to print the string to");
return DumpUTFBufferToStream(ConvertUTF32toUTF8, options.GetData(), *options.GetStream(), options.GetPrefixToken(), options.GetQuote(), options.GetSourceSize(), options.GetEscapeNonPrintables());
}
} // namespace formatters
} // namespace lldb_private
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