/*--------------------------------------------------------------------*/
/*--- Callgrind ---*/
/*--- ct_fn.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Callgrind, a Valgrind tool for call tracing.
Copyright (C) 2002-2011, Josef Weidendorfer (Josef.Weidendorfer@gmx.de)
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
#include "global.h"
#define N_INITIAL_FN_ARRAY_SIZE 10071
static fn_array current_fn_active;
static Addr runtime_resolve_addr = 0;
static int runtime_resolve_length = 0;
// a code pattern is a list of tuples (start offset, length)
struct chunk_t { int start, len; };
struct pattern
{
const char* name;
int len;
struct chunk_t chunk[];
};
/* Scan for a pattern in the code of an ELF object.
* If found, return true and set runtime_resolve_{addr,length}
*/
__attribute__((unused)) // Possibly; depends on the platform.
static Bool check_code(obj_node* obj,
unsigned char code[], struct pattern* pat)
{
Bool found;
Addr addr, end;
int chunk, start, len;
/* first chunk of pattern should always start at offset 0 and
* have at least 3 bytes */
CLG_ASSERT((pat->chunk[0].start == 0) && (pat->chunk[0].len >2));
CLG_DEBUG(1, "check_code: %s, pattern %s, check %d bytes of [%x %x %x...]\n",
obj->name, pat->name, pat->chunk[0].len, code[0], code[1], code[2]);
end = obj->start + obj->size - pat->len;
addr = obj->start;
while(addr < end) {
found = (VG_(memcmp)( (void*)addr, code, pat->chunk[0].len) == 0);
if (found) {
chunk = 1;
while(1) {
start = pat->chunk[chunk].start;
len = pat->chunk[chunk].len;
if (len == 0) break;
CLG_ASSERT(len >2);
CLG_DEBUG(1, " found chunk %d at %#lx, checking %d bytes "
"of [%x %x %x...]\n",
chunk-1, addr - obj->start, len,
code[start], code[start+1], code[start+2]);
if (VG_(memcmp)( (void*)(addr+start), code+start, len) != 0) {
found = False;
break;
}
chunk++;
}
if (found) {
CLG_DEBUG(1, "found at offset %#lx.\n", addr - obj->start);
if (VG_(clo_verbosity) > 1)
VG_(message)(Vg_DebugMsg, "Found runtime_resolve (%s): "
"%s +%#lx=%#lx, length %d\n",
pat->name, obj->name + obj->last_slash_pos,
addr - obj->start, addr, pat->len);
runtime_resolve_addr = addr;
runtime_resolve_length = pat->len;
return True;
}
}
addr++;
}
CLG_DEBUG(1, " found nothing.\n");
return False;
}
/* _ld_runtime_resolve, located in ld.so, needs special handling:
* The jump at end into the resolved function should not be
* represented as a call (as usually done in callgrind with jumps),
* but as a return + call. Otherwise, the repeated existance of
* _ld_runtime_resolve in call chains will lead to huge cycles,
* making the profile almost worthless.
*
* If ld.so is stripped, the symbol will not appear. But as this
* function is handcrafted assembler, we search for it.
*
* We stop if the ELF object name does not seem to be the runtime linker
*/
static Bool search_runtime_resolve(obj_node* obj)
{
#if defined(VGP_x86_linux)
static unsigned char code[] = {
/* 0*/ 0x50, 0x51, 0x52, 0x8b, 0x54, 0x24, 0x10, 0x8b,
/* 8*/ 0x44, 0x24, 0x0c, 0xe8, 0x70, 0x01, 0x00, 0x00,
/*16*/ 0x5a, 0x59, 0x87, 0x04, 0x24, 0xc2, 0x08, 0x00 };
/* Check ranges [0-11] and [16-23] ([12-15] is an absolute address) */
static struct pattern pat = {
"x86-def", 24, {{ 0,12 }, { 16,8 }, { 24,0}} };
/* Pattern for glibc-2.8 on OpenSuse11.0 */
static unsigned char code_28[] = {
/* 0*/ 0x50, 0x51, 0x52, 0x8b, 0x54, 0x24, 0x10, 0x8b,
/* 8*/ 0x44, 0x24, 0x0c, 0xe8, 0x70, 0x01, 0x00, 0x00,
/*16*/ 0x5a, 0x8b, 0x0c, 0x24, 0x89, 0x04, 0x24, 0x8b,
/*24*/ 0x44, 0x24, 0x04, 0xc2, 0x0c, 0x00 };
static struct pattern pat_28 = {
"x86-glibc2.8", 30, {{ 0,12 }, { 16,14 }, { 30,0}} };
if (VG_(strncmp)(obj->name, "/lib/ld", 7) != 0) return False;
if (check_code(obj, code, &pat)) return True;
if (check_code(obj, code_28, &pat_28)) return True;
return False;
#endif
#if defined(VGP_ppc32_linux)
static unsigned char code[] = {
/* 0*/ 0x94, 0x21, 0xff, 0xc0, 0x90, 0x01, 0x00, 0x0c,
/* 8*/ 0x90, 0x61, 0x00, 0x10, 0x90, 0x81, 0x00, 0x14,
/*16*/ 0x7d, 0x83, 0x63, 0x78, 0x90, 0xa1, 0x00, 0x18,
/*24*/ 0x7d, 0x64, 0x5b, 0x78, 0x90, 0xc1, 0x00, 0x1c,
/*32*/ 0x7c, 0x08, 0x02, 0xa6, 0x90, 0xe1, 0x00, 0x20,
/*40*/ 0x90, 0x01, 0x00, 0x30, 0x91, 0x01, 0x00, 0x24,
/*48*/ 0x7c, 0x00, 0x00, 0x26, 0x91, 0x21, 0x00, 0x28,
/*56*/ 0x91, 0x41, 0x00, 0x2c, 0x90, 0x01, 0x00, 0x08,
/*64*/ 0x48, 0x00, 0x02, 0x91, 0x7c, 0x69, 0x03, 0xa6, /* at 64: bl aff0 <fixup> */
/*72*/ 0x80, 0x01, 0x00, 0x30, 0x81, 0x41, 0x00, 0x2c,
/*80*/ 0x81, 0x21, 0x00, 0x28, 0x7c, 0x08, 0x03, 0xa6,
/*88*/ 0x81, 0x01, 0x00, 0x24, 0x80, 0x01, 0x00, 0x08,
/*96*/ 0x80, 0xe1, 0x00, 0x20, 0x80, 0xc1, 0x00, 0x1c,
/*104*/0x7c, 0x0f, 0xf1, 0x20, 0x80, 0xa1, 0x00, 0x18,
/*112*/0x80, 0x81, 0x00, 0x14, 0x80, 0x61, 0x00, 0x10,
/*120*/0x80, 0x01, 0x00, 0x0c, 0x38, 0x21, 0x00, 0x40,
/*128*/0x4e, 0x80, 0x04, 0x20 };
static struct pattern pat = {
"ppc32-def", 132, {{ 0,65 }, { 68,64 }, { 132,0 }} };
if (VG_(strncmp)(obj->name, "/lib/ld", 7) != 0) return False;
return check_code(obj, code, &pat);
#endif
#if defined(VGP_amd64_linux)
static unsigned char code[] = {
/* 0*/ 0x48, 0x83, 0xec, 0x38, 0x48, 0x89, 0x04, 0x24,
/* 8*/ 0x48, 0x89, 0x4c, 0x24, 0x08, 0x48, 0x89, 0x54, 0x24, 0x10,
/*18*/ 0x48, 0x89, 0x74, 0x24, 0x18, 0x48, 0x89, 0x7c, 0x24, 0x20,
/*28*/ 0x4c, 0x89, 0x44, 0x24, 0x28, 0x4c, 0x89, 0x4c, 0x24, 0x30,
/*38*/ 0x48, 0x8b, 0x74, 0x24, 0x40, 0x49, 0x89, 0xf3,
/*46*/ 0x4c, 0x01, 0xde, 0x4c, 0x01, 0xde, 0x48, 0xc1, 0xe6, 0x03,
/*56*/ 0x48, 0x8b, 0x7c, 0x24, 0x38, 0xe8, 0xee, 0x01, 0x00, 0x00,
/*66*/ 0x49, 0x89, 0xc3, 0x4c, 0x8b, 0x4c, 0x24, 0x30,
/*74*/ 0x4c, 0x8b, 0x44, 0x24, 0x28, 0x48, 0x8b, 0x7c, 0x24, 0x20,
/*84*/ 0x48, 0x8b, 0x74, 0x24, 0x18, 0x48, 0x8b, 0x54, 0x24, 0x10,
/*94*/ 0x48, 0x8b, 0x4c, 0x24, 0x08, 0x48, 0x8b, 0x04, 0x24,
/*103*/0x48, 0x83, 0xc4, 0x48, 0x41, 0xff, 0xe3 };
static struct pattern pat = {
"amd64-def", 110, {{ 0,62 }, { 66,44 }, { 110,0 }} };
if ((VG_(strncmp)(obj->name, "/lib/ld", 7) != 0) &&
(VG_(strncmp)(obj->name, "/lib64/ld", 9) != 0)) return False;
return check_code(obj, code, &pat);
#endif
/* For other platforms, no patterns known */
return False;
}
/*------------------------------------------------------------*/
/*--- Object/File/Function hash entry operations ---*/
/*------------------------------------------------------------*/
/* Object hash table, fixed */
static obj_node* obj_table[N_OBJ_ENTRIES];
void CLG_(init_obj_table)()
{
Int i;
for (i = 0; i < N_OBJ_ENTRIES; i++)
obj_table[i] = 0;
}
#define HASH_CONSTANT 256
static UInt str_hash(const Char *s, UInt table_size)
{
int hash_value = 0;
for ( ; *s; s++)
hash_value = (HASH_CONSTANT * hash_value + *s) % table_size;
return hash_value;
}
static Char* anonymous_obj = "???";
static __inline__
obj_node* new_obj_node(DebugInfo* di, obj_node* next)
{
Int i;
obj_node* obj;
obj = (obj_node*) CLG_MALLOC("cl.fn.non.1", sizeof(obj_node));
obj->name = di ? VG_(strdup)( "cl.fn.non.2",
VG_(DebugInfo_get_filename)(di) )
: anonymous_obj;
for (i = 0; i < N_FILE_ENTRIES; i++) {
obj->files[i] = NULL;
}
CLG_(stat).distinct_objs ++;
obj->number = CLG_(stat).distinct_objs;
/* JRS 2008 Feb 19: maybe rename .start/.size/.offset to
.text_avma/.text_size/.test_bias to make it clearer what these
fields really mean */
obj->start = di ? VG_(DebugInfo_get_text_avma)(di) : 0;
obj->size = di ? VG_(DebugInfo_get_text_size)(di) : 0;
obj->offset = di ? VG_(DebugInfo_get_text_bias)(di) : 0;
obj->next = next;
// not only used for debug output (see static.c)
obj->last_slash_pos = 0;
i = 0;
while(obj->name[i]) {
if (obj->name[i]=='/') obj->last_slash_pos = i+1;
i++;
}
if (runtime_resolve_addr == 0) search_runtime_resolve(obj);
return obj;
}
obj_node* CLG_(get_obj_node)(DebugInfo* di)
{
obj_node* curr_obj_node;
UInt objname_hash;
const UChar* obj_name;
obj_name = di ? (Char*) VG_(DebugInfo_get_filename)(di) : anonymous_obj;
/* lookup in obj hash */
objname_hash = str_hash(obj_name, N_OBJ_ENTRIES);
curr_obj_node = obj_table[objname_hash];
while (NULL != curr_obj_node &&
VG_(strcmp)(obj_name, curr_obj_node->name) != 0) {
curr_obj_node = curr_obj_node->next;
}
if (NULL == curr_obj_node) {
obj_table[objname_hash] = curr_obj_node =
new_obj_node(di, obj_table[objname_hash]);
}
return curr_obj_node;
}
static __inline__
file_node* new_file_node(Char filename[FILENAME_LEN],
obj_node* obj, file_node* next)
{
Int i;
file_node* file = (file_node*) CLG_MALLOC("cl.fn.nfn.1",
sizeof(file_node));
file->name = VG_(strdup)("cl.fn.nfn.2", filename);
for (i = 0; i < N_FN_ENTRIES; i++) {
file->fns[i] = NULL;
}
CLG_(stat).distinct_files++;
file->number = CLG_(stat).distinct_files;
file->obj = obj;
file->next = next;
return file;
}
file_node* CLG_(get_file_node)(obj_node* curr_obj_node,
Char filename[FILENAME_LEN])
{
file_node* curr_file_node;
UInt filename_hash;
/* lookup in file hash */
filename_hash = str_hash(filename, N_FILE_ENTRIES);
curr_file_node = curr_obj_node->files[filename_hash];
while (NULL != curr_file_node &&
VG_(strcmp)(filename, curr_file_node->name) != 0) {
curr_file_node = curr_file_node->next;
}
if (NULL == curr_file_node) {
curr_obj_node->files[filename_hash] = curr_file_node =
new_file_node(filename, curr_obj_node,
curr_obj_node->files[filename_hash]);
}
return curr_file_node;
}
/* forward decl. */
static void resize_fn_array(void);
static __inline__
fn_node* new_fn_node(Char fnname[FILENAME_LEN],
file_node* file, fn_node* next)
{
fn_node* fn = (fn_node*) CLG_MALLOC("cl.fn.nfnnd.1",
sizeof(fn_node));
fn->name = VG_(strdup)("cl.fn.nfnnd.2", fnname);
CLG_(stat).distinct_fns++;
fn->number = CLG_(stat).distinct_fns;
fn->last_cxt = 0;
fn->pure_cxt = 0;
fn->file = file;
fn->next = next;
fn->dump_before = False;
fn->dump_after = False;
fn->zero_before = False;
fn->toggle_collect = False;
fn->skip = False;
fn->pop_on_jump = CLG_(clo).pop_on_jump;
fn->is_malloc = False;
fn->is_realloc = False;
fn->is_free = False;
fn->group = 0;
fn->separate_callers = CLG_(clo).separate_callers;
fn->separate_recursions = CLG_(clo).separate_recursions;
#if CLG_ENABLE_DEBUG
fn->verbosity = -1;
#endif
if (CLG_(stat).distinct_fns >= current_fn_active.size)
resize_fn_array();
return fn;
}
/* Get a function node in hash2 with known file node.
* hash nodes are created if needed
*/
static
fn_node* get_fn_node_infile(file_node* curr_file_node,
Char fnname[FN_NAME_LEN])
{
fn_node* curr_fn_node;
UInt fnname_hash;
CLG_ASSERT(curr_file_node != 0);
/* lookup in function hash */
fnname_hash = str_hash(fnname, N_FN_ENTRIES);
curr_fn_node = curr_file_node->fns[fnname_hash];
while (NULL != curr_fn_node &&
VG_(strcmp)(fnname, curr_fn_node->name) != 0) {
curr_fn_node = curr_fn_node->next;
}
if (NULL == curr_fn_node) {
curr_file_node->fns[fnname_hash] = curr_fn_node =
new_fn_node(fnname, curr_file_node,
curr_file_node->fns[fnname_hash]);
}
return curr_fn_node;
}
/* Get a function node in a Segment.
* Hash nodes are created if needed.
*/
static __inline__
fn_node* get_fn_node_inseg(DebugInfo* di,
Char filename[FILENAME_LEN],
Char fnname[FN_NAME_LEN])
{
obj_node *obj = CLG_(get_obj_node)(di);
file_node *file = CLG_(get_file_node)(obj, filename);
fn_node *fn = get_fn_node_infile(file, fnname);
return fn;
}
Bool CLG_(get_debug_info)(Addr instr_addr,
Char file[FILENAME_LEN],
Char fn_name[FN_NAME_LEN], UInt* line_num,
DebugInfo** pDebugInfo)
{
Bool found_file_line, found_fn, found_dirname, result = True;
Char dir[FILENAME_LEN];
UInt line;
CLG_DEBUG(6, " + get_debug_info(%#lx)\n", instr_addr);
if (pDebugInfo) {
*pDebugInfo = VG_(find_DebugInfo)(instr_addr);
// for generated code in anonymous space, pSegInfo is 0
}
found_file_line = VG_(get_filename_linenum)(instr_addr,
file, FILENAME_LEN,
dir, FILENAME_LEN,
&found_dirname,
&line);
found_fn = VG_(get_fnname)(instr_addr,
fn_name, FN_NAME_LEN);
if (found_dirname) {
// +1 for the '/'.
CLG_ASSERT(VG_(strlen)(dir) + VG_(strlen)(file) + 1 < FILENAME_LEN);
VG_(strcat)(dir, "/"); // Append '/'
VG_(strcat)(dir, file); // Append file to dir
VG_(strcpy)(file, dir); // Move dir+file to file
}
if (!found_file_line && !found_fn) {
CLG_(stat).no_debug_BBs++;
VG_(strcpy)(file, "???");
VG_(strcpy)(fn_name, "???");
if (line_num) *line_num=0;
result = False;
} else if ( found_file_line && found_fn) {
CLG_(stat).full_debug_BBs++;
if (line_num) *line_num=line;
} else if ( found_file_line && !found_fn) {
CLG_(stat).file_line_debug_BBs++;
VG_(strcpy)(fn_name, "???");
if (line_num) *line_num=line;
} else /*(!found_file_line && found_fn)*/ {
CLG_(stat).fn_name_debug_BBs++;
VG_(strcpy)(file, "???");
if (line_num) *line_num=0;
}
CLG_DEBUG(6, " - get_debug_info(%#lx): seg '%s', fn %s\n",
instr_addr,
!pDebugInfo ? (const UChar*)"-" :
(*pDebugInfo) ? VG_(DebugInfo_get_filename)(*pDebugInfo) :
(const UChar*)"(None)",
fn_name);
return result;
}
/* for _libc_freeres_wrapper => _exit renaming */
static BB* exit_bb = 0;
/*
* Attach function struct to a BB from debug info.
*/
fn_node* CLG_(get_fn_node)(BB* bb)
{
Char filename[FILENAME_LEN], fnname[FN_NAME_LEN];
DebugInfo* di;
UInt line_num;
fn_node* fn;
/* fn from debug info is idempotent for a BB */
if (bb->fn) return bb->fn;
CLG_DEBUG(3,"+ get_fn_node(BB %#lx)\n", bb_addr(bb));
/* get function/file name, line number and object of
* the BB according to debug information
*/
CLG_(get_debug_info)(bb_addr(bb),
filename, fnname, &line_num, &di);
if (0 == VG_(strcmp)(fnname, "???")) {
int p;
/* Use address as found in library */
if (sizeof(Addr) == 4)
p = VG_(sprintf)(fnname, "%#08lx", bb->offset);
else
// 64bit address
p = VG_(sprintf)(fnname, "%#016lx", bb->offset);
VG_(sprintf)(fnname+p, "%s",
(bb->sect_kind == Vg_SectData) ? " [Data]" :
(bb->sect_kind == Vg_SectBSS) ? " [BSS]" :
(bb->sect_kind == Vg_SectGOT) ? " [GOT]" :
(bb->sect_kind == Vg_SectPLT) ? " [PLT]" : "");
}
else {
if (VG_(get_fnname_if_entry)(bb_addr(bb), fnname, FN_NAME_LEN))
bb->is_entry = 1;
}
/* HACK for correct _exit:
* _exit is redirected to VG_(__libc_freeres_wrapper) by valgrind,
* so we rename it back again :-)
*/
if (0 == VG_(strcmp)(fnname, "vgPlain___libc_freeres_wrapper")
&& exit_bb) {
CLG_(get_debug_info)(bb_addr(exit_bb),
filename, fnname, &line_num, &di);
CLG_DEBUG(1, "__libc_freeres_wrapper renamed to _exit\n");
}
if (0 == VG_(strcmp)(fnname, "_exit") && !exit_bb)
exit_bb = bb;
if (runtime_resolve_addr &&
(bb_addr(bb) >= runtime_resolve_addr) &&
(bb_addr(bb) < runtime_resolve_addr + runtime_resolve_length)) {
/* BB in runtime_resolve found by code check; use this name */
VG_(sprintf)(fnname, "_dl_runtime_resolve");
}
/* get fn_node struct for this function */
fn = get_fn_node_inseg( di, filename, fnname);
/* if this is the 1st time the function is seen,
* some attributes are set */
if (fn->pure_cxt == 0) {
/* Every function gets a "pure" context, i.e. a context with stack
* depth 1 only with this function. This is for compression of mangled
* names
*/
fn_node* pure[2];
pure[0] = 0;
pure[1] = fn;
fn->pure_cxt = CLG_(get_cxt)(pure+1);
if (bb->sect_kind == Vg_SectPLT)
fn->skip = CLG_(clo).skip_plt;
if (VG_(strcmp)(fn->name, "_dl_runtime_resolve")==0) {
fn->pop_on_jump = True;
if (VG_(clo_verbosity) > 1)
VG_(message)(Vg_DebugMsg, "Symbol match: found runtime_resolve:"
" %s +%#lx=%#lx\n",
bb->obj->name + bb->obj->last_slash_pos,
bb->offset, bb_addr(bb));
}
fn->is_malloc = (VG_(strcmp)(fn->name, "malloc")==0);
fn->is_realloc = (VG_(strcmp)(fn->name, "realloc")==0);
fn->is_free = (VG_(strcmp)(fn->name, "free")==0);
/* apply config options from function name patterns
* given on command line */
CLG_(update_fn_config)(fn);
}
bb->fn = fn;
bb->line = line_num;
CLG_DEBUG(3,"- get_fn_node(BB %#lx): %s (in %s:%u)\n",
bb_addr(bb), fnname, filename, line_num);
return fn;
}
/*------------------------------------------------------------*/
/*--- Active function array operations ---*/
/*------------------------------------------------------------*/
/* The active function array is a thread-specific array
* of UInts, mapping function numbers to the active count of
* functions.
* The active count is the number of times a function appears
* in the current call stack, and is used when costs for recursion
* levels should be separated.
*/
UInt* CLG_(get_fn_entry)(Int n)
{
CLG_ASSERT(n < current_fn_active.size);
return current_fn_active.array + n;
}
void CLG_(init_fn_array)(fn_array* a)
{
Int i;
CLG_ASSERT(a != 0);
a->size = N_INITIAL_FN_ARRAY_SIZE;
if (a->size <= CLG_(stat).distinct_fns)
a->size = CLG_(stat).distinct_fns+1;
a->array = (UInt*) CLG_MALLOC("cl.fn.gfe.1",
a->size * sizeof(UInt));
for(i=0;i<a->size;i++)
a->array[i] = 0;
}
void CLG_(copy_current_fn_array)(fn_array* dst)
{
CLG_ASSERT(dst != 0);
dst->size = current_fn_active.size;
dst->array = current_fn_active.array;
}
fn_array* CLG_(get_current_fn_array)()
{
return ¤t_fn_active;
}
void CLG_(set_current_fn_array)(fn_array* a)
{
CLG_ASSERT(a != 0);
current_fn_active.size = a->size;
current_fn_active.array = a->array;
if (current_fn_active.size <= CLG_(stat).distinct_fns)
resize_fn_array();
}
/* ensure that active_array is big enough:
* <distinct_fns> is the highest index, so <fn_active_array_size>
* has to be bigger than that.
*/
static void resize_fn_array(void)
{
UInt* new_array;
Int i, newsize;
newsize = current_fn_active.size;
while (newsize <= CLG_(stat).distinct_fns) newsize *=2;
CLG_DEBUG(0, "Resize fn_active_array: %d => %d\n",
current_fn_active.size, newsize);
new_array = (UInt*) CLG_MALLOC("cl.fn.rfa.1", newsize * sizeof(UInt));
for(i=0;i<current_fn_active.size;i++)
new_array[i] = current_fn_active.array[i];
while(i<newsize)
new_array[i++] = 0;
VG_(free)(current_fn_active.array);
current_fn_active.size = newsize;
current_fn_active.array = new_array;
CLG_(stat).fn_array_resizes++;
}