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ftmemsim-valgrind/callgrind/callstack.c
Josef Weidendorfer 2fd31d27a2 Callgrind: use jmpkind from VEX for side exits. 
To detect calls and returns, Callgrind's heuristic
starts with using the jumpkind got from VEX for
a control flow change instruction. However, for
side exits, it always assumed a (conditional) jump,
which holds true for x86, but e.g. not for ARM.

This fixes Callgrind to use the jumpkind found
by VEX for all exits, which should help making
Callgrind work for ARM. It also moves the check
whether a boring jump is actually a fall-through
to instrumentation time. This changes (fixes) the
result for indirect jumps to the next instruction,
which should not be classified as fall-through
(anyway, this case is probably very rare).

This patch introduces an own enum for jump kinds
in Callgrind. This is less confusing than misusing
the VEX jump kind type, as Callgrinds wants
to distinguish BB fall-throughs from real jumps
(which both are Ijk_Boring in VEX).
Also, setup_bbcc now stores separately whether the
jump kind is conditional or not.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@12269
2011-11-14 21:16:25 +00:00

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/*--------------------------------------------------------------------*/
/*--- Callgrind ---*/
/*--- ct_callstack.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"
/*------------------------------------------------------------*/
/*--- Call stack, operations ---*/
/*------------------------------------------------------------*/
/* Stack of current thread. Gets initialized when switching to 1st thread.
*
* The artificial call stack is an array of call_entry's, representing
* stack frames of the executing program.
* Array call_stack and call_stack_esp have same size and grow on demand.
* Array call_stack_esp holds SPs of corresponding stack frames.
*
*/
#define N_CALL_STACK_INITIAL_ENTRIES 500
call_stack CLG_(current_call_stack);
void CLG_(init_call_stack)(call_stack* s)
{
Int i;
CLG_ASSERT(s != 0);
s->size = N_CALL_STACK_INITIAL_ENTRIES;
s->entry = (call_entry*) CLG_MALLOC("cl.callstack.ics.1",
s->size * sizeof(call_entry));
s->sp = 0;
s->entry[0].cxt = 0; /* for assertion in push_cxt() */
for(i=0; i<s->size; i++) s->entry[i].enter_cost = 0;
}
call_entry* CLG_(get_call_entry)(Int sp)
{
CLG_ASSERT(sp <= CLG_(current_call_stack).sp);
return &(CLG_(current_call_stack).entry[sp]);
}
void CLG_(copy_current_call_stack)(call_stack* dst)
{
CLG_ASSERT(dst != 0);
dst->size = CLG_(current_call_stack).size;
dst->entry = CLG_(current_call_stack).entry;
dst->sp = CLG_(current_call_stack).sp;
}
void CLG_(set_current_call_stack)(call_stack* s)
{
CLG_ASSERT(s != 0);
CLG_(current_call_stack).size = s->size;
CLG_(current_call_stack).entry = s->entry;
CLG_(current_call_stack).sp = s->sp;
}
static __inline__
void ensure_stack_size(Int i)
{
Int oldsize;
call_stack *cs = &CLG_(current_call_stack);
if (i < cs->size) return;
oldsize = cs->size;
cs->size *= 2;
while (i > cs->size) cs->size *= 2;
cs->entry = (call_entry*) VG_(realloc)("cl.callstack.ess.1",
cs->entry,
cs->size * sizeof(call_entry));
for(i=oldsize; i<cs->size; i++)
cs->entry[i].enter_cost = 0;
CLG_(stat).call_stack_resizes++;
CLG_DEBUGIF(2)
VG_(printf)(" call stack enlarged to %d entries\n",
CLG_(current_call_stack).size);
}
/* Called when function entered nonrecursive */
static void function_entered(fn_node* fn)
{
CLG_ASSERT(fn != 0);
#if CLG_ENABLE_DEBUG
if (fn->verbosity >=0) {
Int old = CLG_(clo).verbose;
CLG_(clo).verbose = fn->verbosity;
fn->verbosity = old;
VG_(message)(Vg_DebugMsg,
"Entering %s: Verbosity set to %d\n",
fn->name, CLG_(clo).verbose);
}
#endif
if (fn->dump_before) {
Char trigger[FN_NAME_LEN];
VG_(sprintf)(trigger, "--dump-before=%s", fn->name);
CLG_(dump_profile)(trigger, True);
}
else if (fn->zero_before) {
CLG_(zero_all_cost)(True);
}
if (fn->toggle_collect) {
CLG_(current_state).collect = !CLG_(current_state).collect;
CLG_DEBUG(2," entering %s: toggled collection state to %s\n",
fn->name,
CLG_(current_state).collect ? "ON" : "OFF");
}
}
/* Called when function left (no recursive level active) */
static void function_left(fn_node* fn)
{
CLG_ASSERT(fn != 0);
if (fn->dump_after) {
Char trigger[FN_NAME_LEN];
VG_(sprintf)(trigger, "--dump-after=%s", fn->name);
CLG_(dump_profile)(trigger, True);
}
if (fn->toggle_collect) {
CLG_(current_state).collect = !CLG_(current_state).collect;
CLG_DEBUG(2," leaving %s: toggled collection state to %s\n",
fn->name,
CLG_(current_state).collect ? "ON" : "OFF");
}
#if CLG_ENABLE_DEBUG
if (fn->verbosity >=0) {
Int old = CLG_(clo).verbose;
CLG_(clo).verbose = fn->verbosity;
fn->verbosity = old;
VG_(message)(Vg_DebugMsg,
"Leaving %s: Verbosity set back to %d\n",
fn->name, CLG_(clo).verbose);
}
#endif
}
/* Push call on call stack.
*
* Increment the usage count for the function called.
* A jump from <from> to <to>, with <sp>.
* If <skip> is true, this is a call to a function to be skipped;
* for this, we set jcc = 0.
*/
void CLG_(push_call_stack)(BBCC* from, UInt jmp, BBCC* to, Addr sp, Bool skip)
{
jCC* jcc;
UInt* pdepth;
call_entry* current_entry;
Addr ret_addr;
/* Ensure a call stack of size <current_sp>+1.
* The +1 is needed as push_cxt will store the
* context at [current_sp]
*/
ensure_stack_size(CLG_(current_call_stack).sp +1);
current_entry = &(CLG_(current_call_stack).entry[CLG_(current_call_stack).sp]);
if (skip) {
jcc = 0;
}
else {
fn_node* to_fn = to->cxt->fn[0];
if (CLG_(current_state).nonskipped) {
/* this is a jmp from skipped to nonskipped */
CLG_ASSERT(CLG_(current_state).nonskipped == from);
}
/* As push_cxt() has to be called before push_call_stack if not
* skipping, the old context should already be saved on the stack */
CLG_ASSERT(current_entry->cxt != 0);
CLG_(copy_cost_lz)( CLG_(sets).full, &(current_entry->enter_cost),
CLG_(current_state).cost );
jcc = CLG_(get_jcc)(from, jmp, to);
CLG_ASSERT(jcc != 0);
pdepth = CLG_(get_fn_entry)(to_fn->number);
if (CLG_(clo).skip_direct_recursion) {
/* only increment depth if another function is called */
if (jcc->from->cxt->fn[0] != to_fn) (*pdepth)++;
}
else (*pdepth)++;
if (*pdepth>1)
CLG_(stat).rec_call_counter++;
jcc->call_counter++;
CLG_(stat).call_counter++;
if (*pdepth == 1) function_entered(to_fn);
}
/* return address is only is useful with a real call;
* used to detect RET w/o CALL */
if (from->bb->jmp[jmp].jmpkind == jk_Call) {
UInt instr = from->bb->jmp[jmp].instr;
ret_addr = bb_addr(from->bb) +
from->bb->instr[instr].instr_offset +
from->bb->instr[instr].instr_size;
}
else
ret_addr = 0;
/* put jcc on call stack */
current_entry->jcc = jcc;
current_entry->sp = sp;
current_entry->ret_addr = ret_addr;
current_entry->nonskipped = CLG_(current_state).nonskipped;
CLG_(current_call_stack).sp++;
/* To allow for above assertion we set context of next frame to 0 */
CLG_ASSERT(CLG_(current_call_stack).sp < CLG_(current_call_stack).size);
current_entry++;
current_entry->cxt = 0;
if (!skip)
CLG_(current_state).nonskipped = 0;
else if (!CLG_(current_state).nonskipped) {
/* a call from nonskipped to skipped */
CLG_(current_state).nonskipped = from;
if (!CLG_(current_state).nonskipped->skipped) {
CLG_(init_cost_lz)( CLG_(sets).full,
&CLG_(current_state).nonskipped->skipped);
CLG_(stat).distinct_skips++;
}
}
#if CLG_ENABLE_DEBUG
CLG_DEBUGIF(0) {
if (CLG_(clo).verbose<2) {
if (jcc && jcc->to && jcc->to->bb) {
char spaces[][41] = { " . . . . . . . . . .",
" . . . . . . . . . . ",
" . . . . . . . . . . ",
". . . . . . . . . . " };
int s = CLG_(current_call_stack).sp;
Int* pars = (Int*) sp;
BB* bb = jcc->to->bb;
if (s>40) s=40;
VG_(printf)("%s> %s(0x%x, 0x%x, ...) [%s / %#lx]\n", spaces[s%4]+40-s, bb->fn->name,
pars ? pars[1]:0,
pars ? pars[2]:0,
bb->obj->name + bb->obj->last_slash_pos,
bb->offset);
}
}
else if (CLG_(clo).verbose<4) {
VG_(printf)("+ %2d ", CLG_(current_call_stack).sp);
CLG_(print_short_jcc)(jcc);
VG_(printf)(", SP %#lx, RA %#lx\n", sp, ret_addr);
}
else {
VG_(printf)(" Pushed ");
CLG_(print_stackentry)(3, CLG_(current_call_stack).sp-1);
}
}
#endif
}
/* Pop call stack and update inclusive sums.
* Returns modified fcc.
*
* If the JCC becomes inactive, call entries are freed if possible
*/
void CLG_(pop_call_stack)()
{
jCC* jcc;
Int depth = 0;
call_entry* lower_entry;
if (CLG_(current_state).sig >0) {
/* Check if we leave a signal handler; this can happen when
* calling longjmp() in the handler */
CLG_(run_post_signal_on_call_stack_bottom)();
}
lower_entry =
&(CLG_(current_call_stack).entry[CLG_(current_call_stack).sp-1]);
CLG_DEBUG(4,"+ pop_call_stack: frame %d, jcc %p\n",
CLG_(current_call_stack).sp, lower_entry->jcc);
/* jCC item not any more on real stack: pop */
jcc = lower_entry->jcc;
CLG_(current_state).nonskipped = lower_entry->nonskipped;
if (jcc) {
fn_node* to_fn = jcc->to->cxt->fn[0];
UInt* pdepth = CLG_(get_fn_entry)(to_fn->number);
if (CLG_(clo).skip_direct_recursion) {
/* only decrement depth if another function was called */
if (jcc->from->cxt->fn[0] != to_fn) (*pdepth)--;
}
else (*pdepth)--;
depth = *pdepth;
/* add cost difference to sum */
if ( CLG_(add_diff_cost_lz)( CLG_(sets).full, &(jcc->cost),
lower_entry->enter_cost,
CLG_(current_state).cost) ) {
/* only count this call if it attributed some cost.
* the ret_counter is used to check if a BBCC dump is needed.
*/
jcc->from->ret_counter++;
}
CLG_(stat).ret_counter++;
/* restore context */
CLG_(current_state).cxt = lower_entry->cxt;
CLG_(current_fn_stack).top =
CLG_(current_fn_stack).bottom + lower_entry->fn_sp;
CLG_ASSERT(CLG_(current_state).cxt != 0);
if (depth == 0) function_left(to_fn);
}
/* To allow for an assertion in push_call_stack() */
lower_entry->cxt = 0;
CLG_(current_call_stack).sp--;
#if CLG_ENABLE_DEBUG
CLG_DEBUGIF(1) {
if (CLG_(clo).verbose<4) {
if (jcc) {
/* popped JCC target first */
VG_(printf)("- %2d %#lx => ",
CLG_(current_call_stack).sp,
bb_addr(jcc->to->bb));
CLG_(print_addr)(bb_jmpaddr(jcc->from->bb));
VG_(printf)(", SP %#lx\n",
CLG_(current_call_stack).entry[CLG_(current_call_stack).sp].sp);
CLG_(print_cost)(10, CLG_(sets).full, jcc->cost);
}
else
VG_(printf)("- %2d [Skipped JCC], SP %#lx\n",
CLG_(current_call_stack).sp,
CLG_(current_call_stack).entry[CLG_(current_call_stack).sp].sp);
}
else {
VG_(printf)(" Popped ");
CLG_(print_stackentry)(7, CLG_(current_call_stack).sp);
if (jcc) {
VG_(printf)(" returned to ");
CLG_(print_addr_ln)(bb_jmpaddr(jcc->from->bb));
}
}
}
#endif
}
/* Unwind enough CallStack items to sync with current stack pointer.
* Returns the number of stack frames unwinded.
*/
Int CLG_(unwind_call_stack)(Addr sp, Int minpops)
{
Int csp;
Int unwind_count = 0;
CLG_DEBUG(4,"+ unwind_call_stack(sp %#lx, minpops %d): frame %d\n",
sp, minpops, CLG_(current_call_stack).sp);
/* We pop old stack frames.
* For a call, be p the stack address with return address.
* - call_stack_esp[] has SP after the CALL: p-4
* - current sp is after a RET: >= p
*/
while( (csp=CLG_(current_call_stack).sp) >0) {
call_entry* top_ce = &(CLG_(current_call_stack).entry[csp-1]);
if ((top_ce->sp < sp) ||
((top_ce->sp == sp) && minpops>0)) {
minpops--;
unwind_count++;
CLG_(pop_call_stack)();
csp=CLG_(current_call_stack).sp;
continue;
}
break;
}
CLG_DEBUG(4,"- unwind_call_stack\n");
return unwind_count;
}
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