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add some comments to help explain the compiler's space-safety pass

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Matthew Flatt 2013-04-28 15:19:55 -06:00
parent 0754f79d61
commit 60610b737d
1 changed files with 9 additions and 6 deletions
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15
src/racket/src/schpriv.h
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@ -2801,12 +2801,15 @@ int scheme_is_sub_env(Scheme_Comp_Env *stx_env, Scheme_Comp_Env *env);
typedef struct SFS_Info {
MZTAG_IF_REQUIRED
int for_mod, pass;
int tail_pos;
int depth, stackpos, tlpos;
int selfpos, selfstart, selflen;
int ip, seqn, max_nontail;
int min_touch, max_touch;
int *max_used, *max_calls;
int tail_pos; /* in tail position? */
int depth, stackpos, tlpos; /* stack shape */
int selfpos, selfstart, selflen; /* tracks self calls */
int ip; /* "instruction pointer" --- counts up during traversal of expressions */
int seqn; /* tracks nesting */
int max_nontail; /* ip of last non-tail call in the body */
int min_touch, max_touch; /* tracks range of `macx_used' values changed */
int *max_used; /* maps stack position (i.e., variable) to ip of the variable's last use */
int *max_calls; /* maps stack position to ip of last non-tail call in variable's scope */
Scheme_Object *saved;
} SFS_Info;