diff options
Diffstat (limited to 'gcc/toplev.c')
| -rw-r--r-- | gcc/toplev.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/gcc/toplev.c b/gcc/toplev.c index 70ea2a1..fbbbb64 100644 --- a/gcc/toplev.c +++ b/gcc/toplev.c @@ -720,6 +720,15 @@ int flag_pack_struct = 0; to be allocated dynamically. */ int flag_stack_check; +/* When non-NULL, indicates that whenever space is allocated on the + stack, the resulting stack pointer must not pass this + address---that is, for stacks that grow downward, the stack pointer + must always be greater than or equal to this address; for stacks + that grow upward, the stack pointer must be less than this address. + At present, the rtx may be either a REG or a SYMBOL_REF, although + the support provided depends on the backend. */ +rtx stack_limit_rtx; + /* -fcheck-memory-usage causes extra code to be generated in order to check memory accesses. This is used by a detector of bad memory accesses such as Checker. */ @@ -4889,6 +4898,25 @@ decode_f_option (arg) align_jumps = read_integral_parameter (arg + 12, arg - 2, align_jumps); else if (!strncmp (arg, "align-labels=", 13)) align_labels = read_integral_parameter (arg + 13, arg - 2, align_labels); + else if (!strncmp (arg, "stack-limit-register=", 21)) + { + int reg = decode_reg_name (arg + 21); + if (reg < 0) + error ("unrecognized register name `%s'", arg + 21); + else + stack_limit_rtx = gen_rtx_REG (Pmode, reg); + } + else if (!strncmp (arg, "stack-limit-symbol=", 19)) + { + char *nm; + if (ggc_p) + nm = ggc_alloc_string (arg + 19, strlen (arg + 19)); + else + nm = xstrdup (arg + 19); + stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm); + } + else if (!strcmp (arg, "no-stack-limit")) + stack_limit_rtx = NULL_RTX; else if (!strcmp (arg, "preprocessed")) /* Recognise this switch but do nothing. This prevents warnings about an unrecognised switch if cpplib has not been linked in. */ @@ -5323,6 +5351,7 @@ main (argc, argv) init_ggc (); ggc_add_root (&input_file_stack, 1, sizeof input_file_stack, &mark_file_stack); + ggc_add_rtx_root (&stack_limit_rtx, 1); /* Perform language-specific options intialization. */ lang_init_options (); |