mirror/gcc
2
0
Fork 0
mirror of git://gcc.gnu.org/git/gcc.git synced 2024-12-19 21:10:07 +08:00
Code Issues Packages Projects Releases Wiki Activity

(expand_call): If -fcheck-memory-usage...

Browse Source 
(expand_call): If -fcheck-memory-usage, use pseudo-register, check
indirectly called function is executable, and set rights of memory for
aggregate as write only.
(store_one_arg): If -fcheck-memory-usage, set rights for pushed stack
argument.

From-SVN: r14608
This commit is contained in:
Richard Kenner 1997-08-02 13:14:33 -04:00
parent ca20456a33
commit 7815214ef7
1 changed files with 36 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
gcc/calls.c
View File

@ -594,6 +594,13 @@ expand_call (exp, target, ignore)
register tree p;
register int i, j;
/* The value of the function call can be put in a hard register. But
if -fcheck-memory-usage, code which invokes functions (and thus
damages some hard registers) can be inserted before using the value.
So, target is always a pseudo-register in that case. */
if (flag_check_memory_usage)
target = 0;
/* See if we can find a DECL-node for the actual function.
As a result, decide whether this is a call to an integrable function. */
@ -1595,6 +1602,12 @@ expand_call (exp, target, ignore)
push_temp_slots ();
funexp = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
pop_temp_slots (); /* FUNEXP can't be BLKmode */
/* Check the function is executable. */
if (flag_check_memory_usage)
emit_library_call (chkr_check_exec_libfunc, 1,
VOIDmode, 1,
funexp, ptr_mode);
emit_queue ();
}
@ -1838,6 +1851,15 @@ expand_call (exp, target, ignore)
force_reg (Pmode,
force_operand (structure_value_addr,
NULL_RTX)));
/* Mark the memory for the aggregate as write-only. */
if (flag_check_memory_usage)
emit_library_call (chkr_set_right_libfunc, 1,
VOIDmode, 3,
structure_value_addr, ptr_mode,
GEN_INT (struct_value_size), TYPE_MODE (sizetype),
GEN_INT (MEMORY_USE_WO), QImode);
if (GET_CODE (struct_value_rtx) == REG)
use_reg (&call_fusage, struct_value_rtx);
}
@ -3531,8 +3553,20 @@ store_one_arg (arg, argblock, may_be_alloca, variable_size, fndecl,
do_pending_stack_adjust ();
if (arg->value == arg->stack)
/* If the value is already in the stack slot, we are done. */
;
{
/* If the value is already in the stack slot, we are done. */
if (flag_check_memory_usage && GET_CODE (arg->stack) == MEM)
{
if (arg->mode == BLKmode)
abort ();
emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3,
XEXP (arg->stack, 0), ptr_mode,
GEN_INT (GET_MODE_SIZE (arg->mode)),
TYPE_MODE (sizetype),
GEN_INT (MEMORY_USE_RW), QImode);
}
}
else if (arg->mode != BLKmode)
{
register int size;