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Merge pull request #114 from Shopify/yjit-dup-comments

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YJIT: Avoid adding duplicate code comments
This commit is contained in:
Maxime Chevalier-Boisvert 2021-04-19 15:29:48 -04:00 • committed by Alan Wu
parent 23f88957e6
commit 33c975b813
2 changed files with 19 additions and 2 deletions
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19
yjit_codegen.c
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@ -218,8 +218,25 @@ _counted_side_exit(uint8_t *existing_side_exit, int64_t *counter)
return start;
}
// Add a comment at the current position in the code block
static void
_add_comment(codeblock_t* cb, const char* comment_str)
{
// Avoid adding duplicate comment strings (can happen due to deferred codegen)
size_t num_comments = rb_darray_size(yjit_code_comments);
if (num_comments > 0) {
struct yjit_comment last_comment = rb_darray_get(yjit_code_comments, num_comments - 1);
if (last_comment.offset == cb->write_pos && strcmp(last_comment.comment, comment_str) == 0) {
return;
}
}
struct yjit_comment new_comment = (struct yjit_comment){ cb->write_pos, comment_str };
rb_darray_append(&yjit_code_comments, new_comment);
}
// Comments for generated machine code
#define ADD_COMMENT(cb, comment) rb_darray_append(&yjit_code_comments, ((struct yjit_comment){(cb)->write_pos, (comment)}))
#define ADD_COMMENT(cb, comment) _add_comment((cb), (comment))
yjit_comment_array_t yjit_code_comments;
#else

2
yjit_iface.h
View file

@ -70,7 +70,7 @@ YJIT_DECLARE_COUNTERS(
#undef YJIT_DECLARE_COUNTERS
struct yjit_comment {
int32_t offset;
uint32_t offset;
const char *comment;
};