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In dwarf_reg_states_table_iterate, the rs stack has to persist from

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one run_cfi_program call to the next, so pull the stack out of run_cfi_program
and make the caller responsible for cleanup at the end.
This commit is contained in:
Doug Moore 2017-05-16 01:04:49 -05:00
parent bb61e0bc2b
commit 2b692db23f
1 changed files with 30 additions and 13 deletions
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43
src/dwarf/Gparser.c
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@ -80,14 +80,21 @@ pop_rstate_stack(dwarf_stackable_reg_state_t **rs_stack)
free_reg_state (old_rs);
}
static inline void
empty_rstate_stack(dwarf_stackable_reg_state_t **rs_stack)
{
while (*rs_stack)
pop_rstate_stack(rs_stack);
}
/* Run a CFI program to update the register state. */
static int
run_cfi_program (struct dwarf_cursor *c, dwarf_state_record_t *sr,
unw_word_t *ip, unw_word_t end_ip,
unw_word_t *addr, unw_word_t end_addr,
dwarf_stackable_reg_state_t **rs_stack,
struct dwarf_cie_info *dci)
{
dwarf_stackable_reg_state_t *rs_stack = NULL;
unw_addr_space_t as;
void *arg;
@ -263,25 +270,27 @@ run_cfi_program (struct dwarf_cursor *c, dwarf_state_record_t *sr,
break;
case DW_CFA_remember_state:
if (push_rstate_stack(&rs_stack) < 0)
if (push_rstate_stack(rs_stack) < 0)
{
Debug (1, "Out of memory in DW_CFA_remember_state\n");
ret = -UNW_ENOMEM;
break;
}
memcpy (rs_stack->state.reg, sr->rs_current.reg, sizeof (rs_stack->state.reg));
memcpy ((*rs_stack)->state.reg, sr->rs_current.reg,
sizeof (dwarf_reg_state_t))
Debug (15, "CFA_remember_state\n");
break;
case DW_CFA_restore_state:
if (!rs_stack)
if (!*rs_stack)
{
Debug (1, "register-state stack underflow\n");
ret = -UNW_EINVAL;
break;
}
memcpy (&sr->rs_current.reg, &rs_stack->state.reg, sizeof (rs_stack->state.reg));
pop_rstate_stack(&rs_stack);
memcpy (&sr->rs_current.reg, &(*rs_stack)->state.reg,
sizeof (dwarf_reg_state_t));
pop_rstate_stack(rs_stack);
Debug (15, "CFA_restore_state\n");
break;
@ -412,9 +421,6 @@ run_cfi_program (struct dwarf_cursor *c, dwarf_state_record_t *sr,
}
}
/* Free the register-state stack, if not empty already. */
while (rs_stack)
pop_rstate_stack(&rs_stack);
if (ret > 0)
ret = 0;
return ret;
@ -517,8 +523,12 @@ setup_fde (struct dwarf_cursor *c, dwarf_state_record_t *sr)
c->ret_addr_column = dci->ret_addr_column;
unw_word_t addr = dci->cie_instr_start;
unw_word_t curr_ip = 0;
if ((ret = run_cfi_program (c, sr, &curr_ip, ~(unw_word_t) 0, &addr,
dci->cie_instr_end, dci)) < 0)
dwarf_stackable_reg_state_t *rs_stack = NULL;
ret = run_cfi_program (c, sr, &curr_ip, ~(unw_word_t) 0, &addr,
dci->cie_instr_end,
&rs_stack, dci);
empty_rstate_stack(&rs_stack);
if (ret < 0)
return ret;
memcpy (&sr->rs_initial, &sr->rs_current, sizeof (sr->rs_initial));
@ -532,7 +542,11 @@ parse_fde (struct dwarf_cursor *c, unw_word_t ip, dwarf_state_record_t *sr)
struct dwarf_cie_info *dci = c->pi.unwind_info;
unw_word_t addr = dci->fde_instr_start;
unw_word_t curr_ip = c->pi.start_ip;
if ((ret = run_cfi_program (c, sr, &curr_ip, ip, &addr, dci->fde_instr_end, dci)) < 0)
dwarf_stackable_reg_state_t *rs_stack = NULL;
ret = run_cfi_program (c, sr, &curr_ip, ip, &addr, dci->fde_instr_end,
&rs_stack, dci);
empty_rstate_stack(&rs_stack);
if (ret < 0)
return ret;
return 0;
@ -985,13 +999,16 @@ dwarf_reg_states_table_iterate(struct dwarf_cursor *c,
struct dwarf_cie_info *dci = c->pi.unwind_info;
unw_word_t addr = dci->fde_instr_start;
unw_word_t curr_ip = c->pi.start_ip;
dwarf_stackable_reg_state_t *rs_stack = NULL;
while (ret >= 0 && curr_ip < c->pi.end_ip && addr < dci->fde_instr_end)
{
unw_word_t prev_ip = curr_ip;
ret = run_cfi_program (c, &sr, &curr_ip, prev_ip, &addr, dci->fde_instr_end, dci);
ret = run_cfi_program (c, &sr, &curr_ip, prev_ip, &addr, dci->fde_instr_end,
&rs_stack, dci);
if (ret >= 0 && prev_ip < curr_ip)
ret = cb(token, &sr.rs_current, sizeof(sr.rs_current), prev_ip, curr_ip);
}
empty_rstate_stack(&rs_stack);
#if defined(NEED_LAST_IP)
if (ret >= 0 && curr_ip < c->pi.last_ip)
/* report the dead zone after the procedure ends */