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| author | geoffk <geoffk@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-05-28 21:41:42 +0000 |
|---|---|---|
| committer | geoffk <geoffk@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-05-28 21:41:42 +0000 |
| commit | 5b916b55256694d0decdf4c787a59633cc3013ee (patch) | |
| tree | 9af1763376fdecf50a07b197c0ceaf66f27f32b8 /gcc/stringpool.c | |
| parent | b6a916043c23ec0ee70e090a75e379fe55f5adf7 (diff) | |
| download | gcc-5b916b55256694d0decdf4c787a59633cc3013ee.tar.gz | |
* stringpool.c: Add comments to PCH saving/restoring routines.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@82380 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/stringpool.c')
| -rw-r--r-- | gcc/stringpool.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/gcc/stringpool.c b/gcc/stringpool.c index 3592d4e36a4..781518b9f7d 100644 --- a/gcc/stringpool.c +++ b/gcc/stringpool.c @@ -146,7 +146,7 @@ stringpool_statistics (void) { ht_dump_statistics (ident_hash); } - + /* Mark an identifier for GC. */ static int @@ -193,9 +193,12 @@ gt_pch_n_S (const void *x) { gt_pch_note_object ((void *)x, (void *)x, >_pch_p_S); } - + /* Handle saving and restoring the string pool for PCH. */ +/* SPD is saved in the PCH file and holds the information needed + to restore the string pool. */ + struct string_pool_data GTY(()) { tree * GTY((length ("%h.nslots"))) entries; @@ -205,6 +208,9 @@ struct string_pool_data GTY(()) static GTY(()) struct string_pool_data * spd; +/* Copy HP into the corresponding entry in HT2, and then clear + the cpplib parts of HP. */ + static int ht_copy_and_clear (cpp_reader *r ATTRIBUTE_UNUSED, hashnode hp, const void *ht2_p) { @@ -227,8 +233,15 @@ ht_copy_and_clear (cpp_reader *r ATTRIBUTE_UNUSED, hashnode hp, const void *ht2_ return 1; } +/* The hash table as it was before gt_pch_save_stringpool was called. */ + static struct ht *saved_ident_hash; +/* The hash table contains pointers to the cpp_hashnode inside the + lang_identifier. The PCH machinery can't handle pointers that refer + to the inside of an object, so to save the hash table for PCH the + pointers are adjusted and stored in the variable SPD. */ + void gt_pch_save_stringpool (void) { @@ -249,6 +262,9 @@ gt_pch_save_stringpool (void) ht_forall (ident_hash, ht_copy_and_clear, saved_ident_hash); } +/* Return the stringpool to its state before gt_pch_save_stringpool + was called. */ + void gt_pch_fixup_stringpool (void) { @@ -257,6 +273,9 @@ gt_pch_fixup_stringpool (void) saved_ident_hash = 0; } +/* A PCH file has been restored, which loaded SPD; fill the real hash table + with adjusted pointers from SPD. */ + void gt_pch_restore_stringpool (void) { |