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vms.h (SUBTARGET_OVERRIDE_OPTIONS): For pic code, unset flag_jump_tables. 

* config/alpha/vms.h (SUBTARGET_OVERRIDE_OPTIONS): For pic code,
	unset flag_jump_tables.
	* stmt.c (expand_case): Remove special flag_pic case conditional
	on ASM_OUTPUT_ADDR_DIFF_ELT not being defined.

From-SVN: r187065
This commit is contained in:
Steven Bosscher 2012-05-02 22:18:11 +00:00
parent aefa216b7e
commit daccad6dd9
3 changed files with 18 additions and 4 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2012-05-02 Steven Bosscher <steven@gcc.gnu.org>
* config/alpha/vms.h (SUBTARGET_OVERRIDE_OPTIONS): For pic code,
unset flag_jump_tables.
* stmt.c (expand_case): Remove special flag_pic case conditional
on ASM_OUTPUT_ADDR_DIFF_ELT not being defined.
2012-05-02 Ulrich Weigand <ulrich.weigand@linaro.org>
* common/config/s390/s390-common.c (s390_option_optimization_table):

12
gcc/config/alpha/vms.h
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@ -257,7 +257,15 @@ typedef struct {int num_args; enum avms_arg_type atypes[6];} avms_arg_info;
#undef ASM_FINAL_SPEC
/* The VMS convention is to always provide minimal debug info
for a traceback unless specifically overridden. */
for a traceback unless specifically overridden.
Because ASM_OUTPUT_ADDR_DIFF_ELT is not defined for alpha-vms,
jump tables cannot be output for PIC code, because you can't put
an absolute address in a readonly section. Putting the table in
a writable section is a security hole. Therefore, we unset the
flag_jump_tables flag, forcing switch statements to be expanded
using decision trees. There are probably other ways to address
this issue, but using a decision tree is clearly safe. */
#undef SUBTARGET_OVERRIDE_OPTIONS
#define SUBTARGET_OVERRIDE_OPTIONS \
@ -268,6 +276,8 @@ do { \
write_symbols = VMS_DEBUG; \
debug_info_level = DINFO_LEVEL_TERSE; \
} \
if (flag_pic) \
flag_jump_tables = 0; \
} while (0)
#undef LINK_SPEC

3
gcc/stmt.c
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@ -2198,9 +2198,6 @@ expand_case (gimple stmt)
/* RANGE may be signed, and really large ranges will show up
as negative numbers. */
|| compare_tree_int (range, 0) < 0
#ifndef ASM_OUTPUT_ADDR_DIFF_ELT
|| flag_pic
#endif
|| !flag_jump_tables
|| TREE_CONSTANT (index_expr)
/* If neither casesi or tablejump is available, we can