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Some minor changes + display inheritance #12

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711add9
Remove duplicate function name display
May 8, 2021
dbab327
Remove useless (int (*)(...)) string
May 8, 2021
095d471
Use dladdr1() to get symbol address in static file
May 8, 2021
e0aabd6
Use CXX compiler
May 8, 2021
d7133fb
Display class inheritance
May 8, 2021
23f9759
Update README.md
May 8, 2021
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2 changes: 1 addition & 1 deletion Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ install: vtable-dumper
install vtable-dumper $(DESTDIR)$(prefix)/bin/

vtable-dumper: dump-vtable.c dump-vtable.h
$(CC) $(CFLAGS) $(LDFLAGS) -o vtable-dumper dump-vtable.c -ldl -lelf -lstdc++
$(CXX) $(CFLAGS) $(LDFLAGS) -o vtable-dumper dump-vtable.c -ldl -lelf

uninstall:
rm -f $(DESTDIR)$(prefix)/bin/vtable-dumper
Expand Down
2 changes: 0 additions & 2 deletions README.md
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Expand Up @@ -26,7 +26,6 @@ Install

* libelf
* libdl
* libstdc++

Usage
-----
Expand Down Expand Up @@ -54,7 +53,6 @@ Usage
###### Sample output

Vtable for QIconEnginePlugin
_ZTV17QIconEnginePlugin: 22 entries
0 (int (*)(...)) 0
8 (int (*)(...)) (& _ZTI17QIconEnginePlugin)
16 (int (*)(...)) QIconEnginePlugin::metaObject() const
Expand Down
88 changes: 61 additions & 27 deletions dump-vtable.c
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Expand Up @@ -32,7 +32,7 @@
* MA 02110-1301 USA
*
*/

#include <cxxabi.h>
#include "dump-vtable.h"

const char* TOOL_VERSION = "1.2";
Expand Down Expand Up @@ -195,11 +195,44 @@ int integer_len (int val)
return len;
}

extern char* __cxa_demangle ( const char* mangled_name, char* output_buffer, size_t* length, int* status ); // from libstdc++ ( cxxabi.h )

char *
demangle(const char *mangled_name) {
return __cxa_demangle(mangled_name, NULL, 0, NULL);
return __cxxabiv1::__cxa_demangle(mangled_name, NULL, 0, NULL);
}

static void print_Typeinfo_name(const char* name)
{
char* demngl = demangle(name);
if(opt_mangled==1 && opt_demangled==1)
{
printf("Inherit from %s [%s]\n", demngl, name);
}
else if(opt_demangled==1)
{
printf("Inherit from %s\n", demngl);
}
else
{
printf("Inherit from %s\n", name);
}
free(demngl);
}

static void print_Typeinfo(std::type_info* typeinfo)
{
if (typeid(*typeinfo) == typeid(__cxxabiv1::__si_class_type_info))
{
__cxxabiv1::__si_class_type_info* info = dynamic_cast<__cxxabiv1::__si_class_type_info*>(typeinfo);
print_Typeinfo_name(info->__base_type->name());
}
else if (typeid(*typeinfo) == typeid(__cxxabiv1::__vmi_class_type_info))
{
__cxxabiv1::__vmi_class_type_info* info = dynamic_cast<__cxxabiv1::__vmi_class_type_info*>(typeinfo);
for(int i=0; i<info->__base_count; i++)
{
print_Typeinfo_name(info->__base_info[i].__base_type->name());
}
}
}

void print_VTable(void *dlhndl, vtable_info *vtable)
Expand All @@ -216,22 +249,21 @@ void print_VTable(void *dlhndl, vtable_info *vtable)
char* demngl;
int size;
int space;
Elf32_Sym* sosymbol;

demngl = demangle(vtable->name);
demngl[0] = toupper(demngl[0]);
printf("%s\n", demngl);
free(demngl);

vtablep = dlsym(dlhndl, vtable->name);
vtablep = (union classvtable_mem *)dlsym(dlhndl, vtable->name);

vtbaseoffset = vtablep->cat1.baseoffset;
vttypeinfo = vtablep->cat1.typeinfo;
vtvirtfuncs = vtablep->cat1.virtfuncs;

size = vtable->size/sizeof(ptrdiff_t);

printf("%s: %d entries\n", vtable->name, size);

step = sizeof(ptrdiff_t);

offset = 0;
Expand All @@ -241,33 +273,34 @@ void print_VTable(void *dlhndl, vtable_info *vtable)
}
else
{
printf("%d (int (*)(...)) 0\n", offset);
printf("%d %016x\n", offset, 0);
}

offset += step;
if (dladdr(vttypeinfo, &dlainfo))
if (dladdr1(vttypeinfo, &dlainfo, (void**)&sosymbol, RTLD_DL_SYMENT))
{
demngl = demangle(dlainfo.dli_sname);
if(opt_mangled==1 && opt_demangled==1)
{
printf("%d (int (*)(...)) (& %s) [%s]\n", offset, demngl, dlainfo.dli_sname);
printf("%d %08x (& %s) [%s]\n", offset, sosymbol->st_value, demngl, dlainfo.dli_sname);
}
else if(opt_demangled==1)
{
printf("%d (int (*)(...)) (& %s)\n", offset, demngl);
printf("%d %08x (& %s)\n", offset, sosymbol->st_value, demngl);
}
else
{ // show mangled name by default
printf("%d (int (*)(...)) (& %s)\n", offset, dlainfo.dli_sname);
printf("%d %08x (& %s)\n", offset, sosymbol->st_value, dlainfo.dli_sname);
}
free(demngl);
print_Typeinfo((std::type_info*)dlainfo.dli_saddr);
}
else
{
if (vtbaseoffset!=0)
printf("%d 0u\n", offset);
printf("%d 00000000 0u\n", offset);
else
printf("%d (int (*)(...)) 0\n", offset);
printf("%d 00000000 0\n", offset);
}

for (i = 0; i <= size - 3; i++)
Expand All @@ -278,35 +311,36 @@ void print_VTable(void *dlhndl, vtable_info *vtable)

space = 5 - integer_len(offset);

if (dladdr(vfuncp, &dlainfo))
if (dladdr1(vfuncp, &dlainfo, (void**)&sosymbol, RTLD_DL_SYMENT))
{
printf("%d", offset);
for (j = 0; j<=space; j++)
{
printf(" ");
}
printf("%08x ", sosymbol->st_value);
if (dlainfo.dli_sname==NULL)
{
printf("(int (*)(...)) %p\n", (void*) (vfuncp-dlainfo.dli_fbase));
printf("%p\n", (void*) ((unsigned long)vfuncp-(unsigned long)dlainfo.dli_fbase));
}
else if (strstr(dlainfo.dli_sname, "__cxa_pure"))
{
printf("(int (*)(...)) %s\n", dlainfo.dli_sname);
printf("%s\n", dlainfo.dli_sname);
}
else if (strstr(dlainfo.dli_sname, "_ZTI"))
{
demngl = demangle(dlainfo.dli_sname);
if(opt_mangled==1 && opt_demangled==1)
{
printf("(int (*)(...)) (& %s) [%s]\n", demngl, dlainfo.dli_sname);
printf("(& %s) [%s]\n", demngl, dlainfo.dli_sname);
}
else if(opt_demangled==1)
{
printf("(int (*)(...)) (& %s)\n", demngl);
printf("(& %s)\n", demngl);
}
else
{ // show mangled name by default
printf("(int (*)(...)) (& %s)\n", dlainfo.dli_sname);
printf("(& %s)\n", dlainfo.dli_sname);
}
free(demngl);
}
Expand All @@ -316,26 +350,26 @@ void print_VTable(void *dlhndl, vtable_info *vtable)

if(opt_mangled==1 && opt_demangled==1)
{
printf("(int (*)(...)) %s [%s]\n", demngl, dlainfo.dli_sname);
printf("%s [%s]\n", demngl, dlainfo.dli_sname);
}
else if(opt_demangled==1)
{
printf("(int (*)(...)) %s\n", demngl);
printf("%s\n", demngl);
}
else if(opt_mangled==1)
{
printf("(int (*)(...)) %s\n", dlainfo.dli_sname);
printf("%s\n", dlainfo.dli_sname);
}
else
{
if(strstr(dlainfo.dli_sname, "_ZN") == NULL)
{ // _ZThn, _ZTv, __cxa, etc.
// show mangled name by default
printf("(int (*)(...)) %s\n", dlainfo.dli_sname);
printf("%s\n", dlainfo.dli_sname);
}
else
{
printf("(int (*)(...)) %s\n", demngl);
printf("%s\n", demngl);
}
}

Expand All @@ -357,11 +391,11 @@ void print_VTable(void *dlhndl, vtable_info *vtable)
{
if ((ptrdiff_t)vfuncp < 0)
{
printf("(int (*)(...)) -%016p\n", (void*) -(ptrdiff_t)vfuncp);
printf("-%016p\n", (void*) -(ptrdiff_t)vfuncp);
}
else
{
printf("(int (*)(...)) %016p\n", vfuncp);
printf("%016p\n", vfuncp);
}
}
}
Expand Down
2 changes: 2 additions & 0 deletions dump-vtable.h
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,9 @@
*
*/

#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif

#include <stdlib.h>
#include <stdio.h>
Expand Down