ping
rename subject line due to
http://gcc.gnu.org/ml/gcc-patches/2011-09/msg01189.html
references
http://gcc.gnu.org/ml/gcc-patches/2011-09/msg00310.html
http://gcc.gnu.org/ml/gcc-patches/2011-08/msg00216.html
http://gcc.gnu.org/ml/gcc-patches/2011-07/msg00281.html
http://gcc.gnu.org/ml/gcc-patches/2011-07/msg00149.html
http://gcc.gnu.org/ml/gcc-patches/2011-06/msg01872.html
http://gcc.gnu.org/ml/gcc-patches/2011-03/msg01226.html
gcc/ChangeLog
2011-09-21 Thomas Klein
* opts.c (common_handle_option): introduce new parameters "direct" and
"indirect"
* flag-types.h (enum stack_check_type): Likewise
* explow.c (allocate_dynamic_stack_space):
- suppress stack probing if parameter "direct", "indirect" or if a
stack-limit is given
- do additional read of limit value if parameter "indirect" and a
stack-limit symbol is given
- emit a call to a stack_failure function [as an alternative to a trap
call]
(function probe_stack_range): if allowed to override the range porbe
emit generic_limit_check_stack
* config/arm/arm.c
(stack_check_work_registers): new function to find possible working
registers [only used by "stack check"]
(emit_push_regs): add push RTL instruction without keeping regnumber
and frame memory in mind.
(emit_pop_regs): add pop RTL instruction to revert the above push
(emit_stack_check_insns): new function to write RTL instructions for
stack check at prologue stage.
(arm_expand_prologue): stack check integration for ARM and Thumb-2
(thumb1_output_function_prologue): stack check integration for Thumb-1
* config/arm/arm.md
(cbranchsi4_insn): allow compare and branch using stack pointer
register [at thumb mode]
(arm_cmpsi_insn): allow comparing using stack pointer register [at arm]
(probe_stack): do not emit code when parameters "direct" or "indirect"
is given, emit move code way same as in gcc/explow.c [function
emit_stack_probe]
(probe_stack_done): dummy to make sure probe_stack insns are not
optimized away
(generic_limit_check_stack): if stack-limit and parameter "generic" is
given use the limit the same way as in function
allocate_dynamic_stack_space
(stack_failure): failure call used in stack check functions
emit_stack_check_insns, generic_limit_check_stack or
allocate_dynamic_stack_space [similar to a trap but avoid conflict with
builtin_trap]
Index: gcc/opts.c
===
--- gcc/opts.c (revision 179052)
+++ gcc/opts.c (working copy)
@@ -1644,6 +1644,12 @@ common_handle_option (struct gcc_options *opts,
: STACK_CHECK_STATIC_BUILTIN
? STATIC_BUILTIN_STACK_CHECK
: GENERIC_STACK_CHECK;
+ else if (!strcmp (arg, "indirect"))
+ /* This is an other stack checking method. */
+ opts->x_flag_stack_check = INDIRECT_STACK_CHECK;
+ else if (!strcmp (arg, "direct"))
+ /* This is an other stack checking method. */
+ opts->x_flag_stack_check = DIRECT_STACK_CHECK;
else
warning_at (loc, 0, "unknown stack check parameter \"%s\"", arg);
break;
Index: gcc/flag-types.h
===
--- gcc/flag-types.h(revision 179052)
+++ gcc/flag-types.h(working copy)
@@ -153,7 +153,15 @@ enum stack_check_type
/* Check the stack and entirely rely on the target configuration
files, i.e. do not use the generic mechanism at all. */
- FULL_BUILTIN_STACK_CHECK
+ FULL_BUILTIN_STACK_CHECK,
+
+ /* Check the stack (if possible) before allocation of local variables at
+ each function entry. The stack limit is directly given e.g. by address
+ of a symbol */
+ DIRECT_STACK_CHECK,
+ /* Check the stack (if possible) before allocation of local variables at
+ each function entry. The stack limit is given by global variable. */
+ INDIRECT_STACK_CHECK
};
/* Names for the different levels of -Wstrict-overflow=N. The numeric
Index: gcc/explow.c
===
--- gcc/explow.c(revision 179052)
+++ gcc/explow.c(working copy)
@@ -1386,7 +1386,12 @@ allocate_dynamic_stack_space (rtx size, unsigned s
/* If needed, check that we have the required amount of stack. Take into
account what has already been checked. */
- if (STACK_CHECK_MOVING_SP)
+ if ( STACK_CHECK_MOVING_SP
+#ifdef HAVE_generic_limit_check_stack
+ || crtl->limit_stack
+#endif
+ || flag_stack_check == DIRECT_STACK_CHECK
+ || flag_stack_check == INDIRECT_STACK_CHECK)
;
else if (flag_stack_check == GENERIC_STACK_CHECK)
probe_stack_range (STACK_OLD_CHECK_PROTECT + STACK_CHECK_MAX_FRAME_SIZE,
@@ -1423,19 +1428,32 @@ allocate_dynamic_stack_space (rtx size, unsigned s
/* Check stack bounds if necessary. */
if (crtl->limit_
