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Copy pathvectors.cpp
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361 lines (290 loc) · 8.74 KB
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// Lists embeded STL vectors and pointers to STL vectors found in the given
// memory range.
//
// Linux and OS X only
#include <vector>
#include <string>
#include <stdio.h>
#include "Core.h"
#include "Console.h"
#include "Export.h"
#include "PluginManager.h"
#include "MemAccess.h"
#include "VersionInfo.h"
using std::vector;
using std::string;
using namespace DFHack;
struct t_vecTriplet
{
void * start;
void * end;
void * alloc_end;
};
command_result df_vectors (color_ostream &out, vector <string> & parameters);
command_result df_clearvec (color_ostream &out, vector <string> & parameters);
DFHACK_PLUGIN("vectors");
DFhackCExport command_result plugin_init ( color_ostream &out, std::vector <PluginCommand> &commands)
{
commands.push_back(PluginCommand("vectors",
"Scan memory for vectors.\
\n 1st param: start of scan\
\n 2nd param: number of bytes to scan",
df_vectors));
commands.push_back(PluginCommand("clearvec",
"Set list of vectors to zero length",
df_clearvec));
return CR_OK;
}
DFhackCExport command_result plugin_shutdown ( color_ostream &out )
{
return CR_OK;
}
static bool hexOrDec(string &str, uintptr_t &value)
{
std::stringstream ss;
ss << str;
if (str.find("0x") == 0 && (ss >> std::hex >> value))
return true;
else if (ss >> std::dec >> value)
return true;
return false;
}
static bool mightBeVec(vector<t_memrange> &ranges,
t_vecTriplet *vec)
{
if ((vec->start > vec->end) || (vec->end > vec->alloc_end))
return false;
// Vector length might not be a multiple of 4 if, for example,
// it's a vector of uint8_t or uint16_t. However, the actual memory
// allocated to the vector should be 4 byte aligned.
if (((intptr_t)vec->start % 4 != 0) || ((intptr_t)vec->alloc_end % 4 != 0))
return false;
for (size_t i = 0; i < ranges.size(); i++)
{
t_memrange &range = ranges[i];
if (range.isInRange(vec->start) && range.isInRange(vec->alloc_end))
return true;
}
return false;
}
static bool inAnyRange(vector<t_memrange> &ranges, void * ptr)
{
for (size_t i = 0; i < ranges.size(); i++)
{
if (ranges[i].isInRange(ptr))
return true;
}
return false;
}
static bool getRanges(color_ostream &out, std::vector<t_memrange> &out_ranges)
{
std::vector<t_memrange> ranges;
Core::getInstance().p->getMemRanges(ranges);
for (size_t i = 0; i < ranges.size(); i++)
{
t_memrange &range = ranges[i];
if (range.read && range.write && !range.shared)
out_ranges.push_back(range);
}
if (out_ranges.empty())
{
out << "No readable segments." << std::endl;
return false;
}
return true;
}
////////////////////////////////////////
// COMMAND: vectors
////////////////////////////////////////
static void vectorsUsage(color_ostream &con)
{
con << "Usage: vectors <start of scan address> <# bytes to scan>"
<< std::endl;
}
static void printVec(color_ostream &con, const char* msg, t_vecTriplet *vec,
uintptr_t start, uintptr_t pos, std::vector<t_memrange> &ranges)
{
uintptr_t length = (intptr_t)vec->end - (intptr_t)vec->start;
uintptr_t offset = pos - start;
con.print("%8s offset 0x%06zx, addr 0x%01zx, start 0x%01zx, length %zi",
msg, offset, pos, intptr_t(vec->start), length);
if (length >= 4 && length % 4 == 0)
{
void *ptr = vec->start;
for (int level = 0; level < 2; level++)
{
if (inAnyRange(ranges, ptr))
ptr = *(void**)ptr;
}
std::string classname;
if (Core::getInstance().vinfo->getVTableName(ptr, classname))
con.print(", 1st item: %s", classname.c_str());
}
con.print("\n");
}
command_result df_vectors (color_ostream &con, vector <string> & parameters)
{
if (parameters.size() != 2)
{
vectorsUsage(con);
return CR_FAILURE;
}
uintptr_t start = 0, bytes = 0;
if (!hexOrDec(parameters[0], start))
{
vectorsUsage(con);
return CR_FAILURE;
}
if (!hexOrDec(parameters[1], bytes))
{
vectorsUsage(con);
return CR_FAILURE;
}
uintptr_t end = start + bytes;
// 4 byte alignment.
while (start % 4 != 0)
start++;
CoreSuspender suspend;
std::vector<t_memrange> ranges;
if (!getRanges(con, ranges))
{
return CR_FAILURE;
}
bool startInRange = false;
for (size_t i = 0; i < ranges.size(); i++)
{
t_memrange &range = ranges[i];
if (!range.isInRange((void *)start))
continue;
// Found the range containing the start
if (!range.isInRange((void *)end))
{
con.print("Scanning %zi bytes would read past end of memory "
"range.\n", bytes);
size_t diff = end - (intptr_t)range.end;
con.print("Cutting bytes down by %zi.\n", diff);
end = (uintptr_t) range.end;
}
startInRange = true;
break;
} // for (size_t i = 0; i < ranges.size(); i++)
if (!startInRange)
{
con << "Address not in any memory range." << std::endl;
return CR_FAILURE;
}
uintptr_t pos = start;
const size_t ptr_size = sizeof(void*);
for (uintptr_t pos = start; pos < end; pos += ptr_size)
{
// Is it an embeded vector?
if (pos <= ( end - sizeof(t_vecTriplet) ))
{
t_vecTriplet* vec = (t_vecTriplet*) pos;
if (mightBeVec(ranges, vec))
{
printVec(con, "VEC:", vec, start, pos, ranges);
// Skip over rest of vector.
pos += sizeof(t_vecTriplet) - ptr_size;
continue;
}
}
// Is it a vector pointer?
if (pos <= (end - ptr_size))
{
uintptr_t ptr = * ( (uintptr_t*) pos);
if (inAnyRange(ranges, (void *) ptr))
{
t_vecTriplet* vec = (t_vecTriplet*) ptr;
if (mightBeVec(ranges, vec))
{
printVec(con, "VEC PTR:", vec, start, pos, ranges);
continue;
}
}
}
} // for (uint32_t pos = start; pos < end; pos += ptr_size)
return CR_OK;
}
////////////////////////////////////////
// COMMAND: clearvec
////////////////////////////////////////
static void clearUsage(color_ostream &con)
{
con << "Usage: clearvec <vector1 addr> [vector2 addr] ..." << std::endl;
con << "Address can be either for vector or pointer to vector."
<< std::endl;
}
command_result df_clearvec (color_ostream &con, vector <string> & parameters)
{
if (parameters.size() == 0)
{
clearUsage(con);
return CR_FAILURE;
}
uintptr_t start = 0, bytes = 0;
if (!hexOrDec(parameters[0], start))
{
vectorsUsage(con);
return CR_FAILURE;
}
if (!hexOrDec(parameters[1], bytes))
{
vectorsUsage(con);
return CR_FAILURE;
}
CoreSuspender suspend;
std::vector<t_memrange> ranges;
if (!getRanges(con, ranges))
{
return CR_FAILURE;
}
for (size_t i = 0; i < parameters.size(); i++)
{
std::string addr_str = parameters[i];
uintptr_t addr;
if (!hexOrDec(addr_str, addr))
{
con << "'" << addr_str << "' not a number." << std::endl;
continue;
}
if (addr % 4 != 0)
{
con << addr_str << " not 4 byte aligned." << std::endl;
continue;
}
if (!inAnyRange(ranges, (void *) addr))
{
con << addr_str << " not in any valid address range." << std::endl;
continue;
}
bool valid = false;
bool ptr = false;
t_vecTriplet* vec = (t_vecTriplet*) addr;
if (mightBeVec(ranges, vec))
valid = true;
else
{
// Is it a pointer to a vector?
addr = * ( (uintptr_t*) addr);
vec = (t_vecTriplet*) addr;
if (inAnyRange(ranges, (void *) addr) && mightBeVec(ranges, vec))
{
valid = true;
ptr = true;
}
}
if (!valid)
{
con << addr_str << " is not a vector." << std::endl;
continue;
}
vec->end = vec->start;
if (ptr)
con << "Vector pointer ";
else
con << "Vector ";
con << addr_str << " set to zero length." << std::endl;
} // for (size_t i = 0; i < parameters.size(); i++)
return CR_OK;
}
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