Vectors plugin: searches memory for vectors
Lists embeded STL vectors and pointers to STL vectors found in the given memory range. Linux only, enabled with BUILD_VECTORS cmake option.develop
Matthew Cline
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9f822af45a
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7d1d916570
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// Lists embeded STL vectors and pointers to STL vectors found in the given
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// memory range.
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//
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// Linux only, enabled with BUILD_VECTORS cmake option.
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#include <dfhack/Core.h>
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#include <dfhack/Console.h>
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#include <dfhack/Export.h>
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#include <dfhack/PluginManager.h>
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#include <dfhack/Process.h>
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#include <vector>
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#include <string>
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#include <stdio.h>
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using std::vector;
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using std::string;
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using namespace DFHack;
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struct t_vecTriplet
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{
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uint32_t start;
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uint32_t end;
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uint32_t alloc_end;
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};
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DFhackCExport command_result df_vectors (Core * c, vector <string> & parameters);
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DFhackCExport const char * plugin_name ( void )
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{
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return "vectors";
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}
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DFhackCExport command_result plugin_init ( Core * c, std::vector <PluginCommand> &commands)
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{
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commands.clear();
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commands.push_back(PluginCommand("vectors",
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"Scan memory for vectors.\
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\n 1st param: start of scan\
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\n 2nd param: number of bytes to scan",
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df_vectors));
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return CR_OK;
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}
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DFhackCExport command_result plugin_shutdown ( Core * c )
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{
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return CR_OK;
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}
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static bool hexOrDec(string &str, uint32_t &value)
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{
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if (str.find("0x") == 0 && sscanf(str.c_str(), "%x", &value) == 1)
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return true;
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else if (sscanf(str.c_str(), "%u", &value) == 1)
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return true;
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return false;
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}
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static void usage(Console &con)
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{
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con << "Usage: vectors <start of scan address> <# bytes to scan>"
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<< std::endl;
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}
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static bool mightBeVec(vector<t_memrange> &heap_ranges,
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t_vecTriplet *vec)
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{
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if ((vec->start > vec->end) || (vec->end > vec->alloc_end))
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return false;
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if ((vec->end - vec->start) % 4 != 0)
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return false;
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for (size_t i = 0; i < heap_ranges.size(); i++)
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{
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t_memrange &range = heap_ranges[i];
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if (range.isInRange(vec->start) && range.isInRange(vec->alloc_end))
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return true;
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}
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return false;
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}
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static bool inAnyRange(vector<t_memrange> &ranges, uint32_t ptr)
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{
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for (size_t i = 0; i < ranges.size(); i++)
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{
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if (ranges[i].isInRange(ptr))
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return true;
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}
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return false;
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}
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static void printVec(Console &con, const char* msg, t_vecTriplet *vec,
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uint32_t start, uint32_t pos)
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{
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uint32_t length = vec->end - vec->start;
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uint32_t offset = pos - start;
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con.print("%8s offset %06p, addr %010p, start %010p, length %u\n",
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msg, offset, pos, vec->start, length);
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}
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DFhackCExport command_result df_vectors (Core * c, vector <string> & parameters)
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{
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Console & con = c->con;
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if (parameters.size() != 2)
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{
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usage(con);
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return CR_FAILURE;
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}
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uint32_t start = 0, bytes = 0;
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if (!hexOrDec(parameters[0], start))
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{
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usage(con);
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return CR_FAILURE;
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}
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if (!hexOrDec(parameters[1], bytes))
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{
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usage(con);
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return CR_FAILURE;
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}
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uint32_t end = start + bytes;
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// 4 byte alignment.
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while (start % 4 != 0)
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start++;
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c->Suspend();
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std::vector<t_memrange> ranges;
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std::vector<t_memrange> heap_ranges;
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c->p->getMemRanges(ranges);
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bool startInRange = false;
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for (size_t i = 0; i < ranges.size(); i++)
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{
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t_memrange &range = ranges[i];
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// Some kernels don't report [heap], and the heap can consist of
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// more segments than just the one labeled with [heap], so include
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// all segments which *might* be part of the heap.
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if (range.read && range.write && !range.shared)
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{
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if (strlen(range.name) == 0 || strcmp(range.name, "[heap]") == 0)
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heap_ranges.push_back(range);
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}
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if (!range.isInRange(start))
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continue;
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// Found the range containing the start
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if (!range.isInRange(end))
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{
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con.print("Scanning %u bytes would read past end of memory "
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"range.\n", bytes);
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uint32_t diff = end - range.end;
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con.print("Cutting bytes down by %u.\n", diff);
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end = (uint32_t) range.end;
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}
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startInRange = true;
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} // for (size_t i = 0; i < ranges.size(); i++)
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if (!startInRange)
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{
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con << "Address not in any memory range." << std::endl;
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c->Resume();
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return CR_FAILURE;
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}
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if (heap_ranges.empty())
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{
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con << "No possible heap segments." << std::endl;
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c->Resume();
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return CR_FAILURE;
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}
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uint32_t pos = start;
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const uint32_t ptr_size = sizeof(void*);
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for (uint32_t pos = start; pos < end; pos += ptr_size)
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{
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// Is it an embeded vector?
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if (pos <= ( end - sizeof(t_vecTriplet) ))
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{
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t_vecTriplet* vec = (t_vecTriplet*) pos;
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if (mightBeVec(heap_ranges, vec))
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{
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printVec(con, "VEC:", vec, start, pos);
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// Skip over rest of vector.
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pos += sizeof(t_vecTriplet) - ptr_size;
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continue;
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}
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}
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// Is it a vector pointer?
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if (pos <= (end - ptr_size))
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{
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uint32_t ptr = * ( (uint32_t*) pos);
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if (inAnyRange(heap_ranges, ptr))
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{
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t_vecTriplet* vec = (t_vecTriplet*) ptr;
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if (mightBeVec(heap_ranges, vec))
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{
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printVec(con, "VEC PTR:", vec, start, pos);
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continue;
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}
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}
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}
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} // for (uint32_t pos = start; pos < end; pos += ptr_size)
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c->Resume();
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return CR_OK;
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}
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