diff options
Diffstat (limited to 'cop.h')
| -rw-r--r-- | cop.h | 75 |
1 files changed, 75 insertions, 0 deletions
@@ -285,3 +285,78 @@ struct context { #define G_EVAL 4 /* Assume eval {} around subroutine call. */ #define G_NOARGS 8 /* Don't construct a @_ array. */ #define G_KEEPERR 16 /* Append errors to $@, don't overwrite it */ + +/* Support for switching (stack and block) contexts. + * This ensures magic doesn't invalidate local stack and cx pointers. + */ + +#define SI_UNDEF 0 +#define SI_MAIN 1 +#define SI_MAGIC 2 +#define SI_SORT 3 +#define SI_SIGNAL 4 +#define SI_OVERLOAD 5 +#define SI_DESTROY 6 +#define SI_WARNHOOK 7 +#define SI_DIEHOOK 8 + +struct stackinfo { + AV * si_stack; /* stack for current runlevel */ + PERL_CONTEXT * si_cxstack; /* context stack for runlevel */ + I32 si_cxix; /* current context index */ + I32 si_cxmax; /* maximum allocated index */ + I32 si_type; /* type of runlevel */ + struct stackinfo * si_prev; + struct stackinfo * si_next; + I32 * si_markbase; /* where markstack begins for us. + * currently used only with DEBUGGING, + * but not #ifdef-ed for bincompat */ +}; + +typedef struct stackinfo PERL_SI; + +#define cxstack (curstackinfo->si_cxstack) +#define cxstack_ix (curstackinfo->si_cxix) +#define cxstack_max (curstackinfo->si_cxmax) + +#ifdef DEBUGGING +# define SET_MARKBASE curstackinfo->si_markbase = markstack_ptr +#else +# define SET_MARKBASE NOOP +#endif + +#define PUSHSTACK(type) \ + STMT_START { \ + PERL_SI *next = curstackinfo->si_next; \ + if (!next) { \ + next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1); \ + next->si_prev = curstackinfo; \ + curstackinfo->si_next = next; \ + } \ + next->si_type = type; \ + next->si_cxix = -1; \ + AvFILLp(next->si_stack) = 0; \ + SWITCHSTACK(curstack,next->si_stack); \ + curstackinfo = next; \ + SET_MARKBASE; \ + } STMT_END + +#define POPSTACK() \ + STMT_START { \ + PERL_SI *prev = curstackinfo->si_prev; \ + if (!prev) { \ + PerlIO_printf(PerlIO_stderr(), "panic: POPSTACK\n"); \ + my_exit(1); \ + } \ + SWITCHSTACK(curstack,prev->si_stack); \ + /* don't free prev here, free them all at the END{} */ \ + curstackinfo = prev; \ + } STMT_END + +#define POPSTACK_TO(s) \ + STMT_START { \ + while (curstack != s) { \ + dounwind(-1); \ + POPSTACK(); \ + } \ + } STMT_END |