+++ /dev/null
-/*
- * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
- * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
- * Copyright (c) 1996 by Silicon Graphics. All rights reserved.
- *
- * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
- * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
- *
- * Permission is hereby granted to use or copy this program
- * for any purpose, provided the above notices are retained on all copies.
- * Permission to modify the code and to distribute modified code is granted,
- * provided the above notices are retained, and a notice that the code was
- * modified is included with the above copyright notice.
- */
-
-/*
- * This implements:
- * 1. allocation of heap block headers
- * 2. A map from addresses to heap block addresses to heap block headers
- *
- * Access speed is crucial. We implement an index structure based on a 2
- * level tree.
- */
-
-# include "private/gc_priv.h"
-
-bottom_index * GC_all_bottom_indices = 0;
- /* Pointer to first (lowest addr) */
- /* bottom_index. */
-
-bottom_index * GC_all_bottom_indices_end = 0;
- /* Pointer to last (highest addr) */
- /* bottom_index. */
-
-/* Non-macro version of header location routine */
-hdr * GC_find_header(h)
-ptr_t h;
-{
-# ifdef HASH_TL
- register hdr * result;
- GET_HDR(h, result);
- return(result);
-# else
- return(HDR_INNER(h));
-# endif
-}
-
-/* Routines to dynamically allocate collector data structures that will */
-/* never be freed. */
-
-static ptr_t scratch_free_ptr = 0;
-
-/* GC_scratch_last_end_ptr is end point of last obtained scratch area. */
-/* GC_scratch_end_ptr is end point of current scratch area. */
-
-ptr_t GC_scratch_alloc(bytes)
-register word bytes;
-{
- register ptr_t result = scratch_free_ptr;
-
-# ifdef ALIGN_DOUBLE
-# define GRANULARITY (2 * sizeof(word))
-# else
-# define GRANULARITY sizeof(word)
-# endif
- bytes += GRANULARITY-1;
- bytes &= ~(GRANULARITY-1);
- scratch_free_ptr += bytes;
- if (scratch_free_ptr <= GC_scratch_end_ptr) {
- return(result);
- }
- {
- word bytes_to_get = MINHINCR * HBLKSIZE;
-
- if (bytes_to_get <= bytes) {
- /* Undo the damage, and get memory directly */
- bytes_to_get = bytes;
-# ifdef USE_MMAP
- bytes_to_get += GC_page_size - 1;
- bytes_to_get &= ~(GC_page_size - 1);
-# endif
- result = (ptr_t)GET_MEM(bytes_to_get);
- scratch_free_ptr -= bytes;
- GC_scratch_last_end_ptr = result + bytes;
- return(result);
- }
- result = (ptr_t)GET_MEM(bytes_to_get);
- if (result == 0) {
-# ifdef PRINTSTATS
- GC_printf0("Out of memory - trying to allocate less\n");
-# endif
- scratch_free_ptr -= bytes;
- bytes_to_get = bytes;
-# ifdef USE_MMAP
- bytes_to_get += GC_page_size - 1;
- bytes_to_get &= ~(GC_page_size - 1);
-# endif
- return((ptr_t)GET_MEM(bytes_to_get));
- }
- scratch_free_ptr = result;
- GC_scratch_end_ptr = scratch_free_ptr + bytes_to_get;
- GC_scratch_last_end_ptr = GC_scratch_end_ptr;
- return(GC_scratch_alloc(bytes));
- }
-}
-
-static hdr * hdr_free_list = 0;
-
-/* Return an uninitialized header */
-static hdr * alloc_hdr()
-{
- register hdr * result;
-
- if (hdr_free_list == 0) {
- result = (hdr *) GC_scratch_alloc((word)(sizeof(hdr)));
- } else {
- result = hdr_free_list;
- hdr_free_list = (hdr *) (result -> hb_next);
- }
- return(result);
-}
-
-static void free_hdr(hhdr)
-hdr * hhdr;
-{
- hhdr -> hb_next = (struct hblk *) hdr_free_list;
- hdr_free_list = hhdr;
-}
-
-hdr * GC_invalid_header;
-
-#ifdef USE_HDR_CACHE
- word GC_hdr_cache_hits = 0;
- word GC_hdr_cache_misses = 0;
-#endif
-
-void GC_init_headers()
-{
- register unsigned i;
-
- GC_all_nils = (bottom_index *)GC_scratch_alloc((word)sizeof(bottom_index));
- BZERO(GC_all_nils, sizeof(bottom_index));
- for (i = 0; i < TOP_SZ; i++) {
- GC_top_index[i] = GC_all_nils;
- }
- GC_invalid_header = alloc_hdr();
- GC_invalidate_map(GC_invalid_header);
-}
-
-/* Make sure that there is a bottom level index block for address addr */
-/* Return FALSE on failure. */
-static GC_bool get_index(addr)
-word addr;
-{
- word hi = (word)(addr) >> (LOG_BOTTOM_SZ + LOG_HBLKSIZE);
- bottom_index * r;
- bottom_index * p;
- bottom_index ** prev;
- bottom_index *pi;
-
-# ifdef HASH_TL
- unsigned i = TL_HASH(hi);
- bottom_index * old;
-
- old = p = GC_top_index[i];
- while(p != GC_all_nils) {
- if (p -> key == hi) return(TRUE);
- p = p -> hash_link;
- }
- r = (bottom_index*)GC_scratch_alloc((word)(sizeof (bottom_index)));
- if (r == 0) return(FALSE);
- BZERO(r, sizeof (bottom_index));
- r -> hash_link = old;
- GC_top_index[i] = r;
-# else
- if (GC_top_index[hi] != GC_all_nils) return(TRUE);
- r = (bottom_index*)GC_scratch_alloc((word)(sizeof (bottom_index)));
- if (r == 0) return(FALSE);
- GC_top_index[hi] = r;
- BZERO(r, sizeof (bottom_index));
-# endif
- r -> key = hi;
- /* Add it to the list of bottom indices */
- prev = &GC_all_bottom_indices; /* pointer to p */
- pi = 0; /* bottom_index preceding p */
- while ((p = *prev) != 0 && p -> key < hi) {
- pi = p;
- prev = &(p -> asc_link);
- }
- r -> desc_link = pi;
- if (0 == p) {
- GC_all_bottom_indices_end = r;
- } else {
- p -> desc_link = r;
- }
- r -> asc_link = p;
- *prev = r;
- return(TRUE);
-}
-
-/* Install a header for block h. */
-/* The header is uninitialized. */
-/* Returns the header or 0 on failure. */
-struct hblkhdr * GC_install_header(h)
-register struct hblk * h;
-{
- hdr * result;
-
- if (!get_index((word) h)) return(FALSE);
- result = alloc_hdr();
- SET_HDR(h, result);
-# ifdef USE_MUNMAP
- result -> hb_last_reclaimed = GC_gc_no;
-# endif
- return(result);
-}
-
-/* Set up forwarding counts for block h of size sz */
-GC_bool GC_install_counts(h, sz)
-register struct hblk * h;
-register word sz; /* bytes */
-{
- register struct hblk * hbp;
- register int i;
-
- for (hbp = h; (char *)hbp < (char *)h + sz; hbp += BOTTOM_SZ) {
- if (!get_index((word) hbp)) return(FALSE);
- }
- if (!get_index((word)h + sz - 1)) return(FALSE);
- for (hbp = h + 1; (char *)hbp < (char *)h + sz; hbp += 1) {
- i = HBLK_PTR_DIFF(hbp, h);
- SET_HDR(hbp, (hdr *)(i > MAX_JUMP? MAX_JUMP : i));
- }
- return(TRUE);
-}
-
-/* Remove the header for block h */
-void GC_remove_header(h)
-register struct hblk * h;
-{
- hdr ** ha;
-
- GET_HDR_ADDR(h, ha);
- free_hdr(*ha);
- *ha = 0;
-}
-
-/* Remove forwarding counts for h */
-void GC_remove_counts(h, sz)
-register struct hblk * h;
-register word sz; /* bytes */
-{
- register struct hblk * hbp;
-
- for (hbp = h+1; (char *)hbp < (char *)h + sz; hbp += 1) {
- SET_HDR(hbp, 0);
- }
-}
-
-/* Apply fn to all allocated blocks */
-/*VARARGS1*/
-void GC_apply_to_all_blocks(fn, client_data)
-void (*fn) GC_PROTO((struct hblk *h, word client_data));
-word client_data;
-{
- register int j;
- register bottom_index * index_p;
-
- for (index_p = GC_all_bottom_indices; index_p != 0;
- index_p = index_p -> asc_link) {
- for (j = BOTTOM_SZ-1; j >= 0;) {
- if (!IS_FORWARDING_ADDR_OR_NIL(index_p->index[j])) {
- if (index_p->index[j]->hb_map != GC_invalid_map) {
- (*fn)(((struct hblk *)
- (((index_p->key << LOG_BOTTOM_SZ) + (word)j)
- << LOG_HBLKSIZE)),
- client_data);
- }
- j--;
- } else if (index_p->index[j] == 0) {
- j--;
- } else {
- j -= (word)(index_p->index[j]);
- }
- }
- }
-}
-
-/* Get the next valid block whose address is at least h */
-/* Return 0 if there is none. */
-struct hblk * GC_next_used_block(h)
-struct hblk * h;
-{
- register bottom_index * bi;
- register word j = ((word)h >> LOG_HBLKSIZE) & (BOTTOM_SZ-1);
-
- GET_BI(h, bi);
- if (bi == GC_all_nils) {
- register word hi = (word)h >> (LOG_BOTTOM_SZ + LOG_HBLKSIZE);
- bi = GC_all_bottom_indices;
- while (bi != 0 && bi -> key < hi) bi = bi -> asc_link;
- j = 0;
- }
- while(bi != 0) {
- while (j < BOTTOM_SZ) {
- hdr * hhdr = bi -> index[j];
- if (IS_FORWARDING_ADDR_OR_NIL(hhdr)) {
- j++;
- } else {
- if (hhdr->hb_map != GC_invalid_map) {
- return((struct hblk *)
- (((bi -> key << LOG_BOTTOM_SZ) + j)
- << LOG_HBLKSIZE));
- } else {
- j += divHBLKSZ(hhdr -> hb_sz);
- }
- }
- }
- j = 0;
- bi = bi -> asc_link;
- }
- return(0);
-}
-
-/* Get the last (highest address) block whose address is */
-/* at most h. Return 0 if there is none. */
-/* Unlike the above, this may return a free block. */
-struct hblk * GC_prev_block(h)
-struct hblk * h;
-{
- register bottom_index * bi;
- register signed_word j = ((word)h >> LOG_HBLKSIZE) & (BOTTOM_SZ-1);
-
- GET_BI(h, bi);
- if (bi == GC_all_nils) {
- register word hi = (word)h >> (LOG_BOTTOM_SZ + LOG_HBLKSIZE);
- bi = GC_all_bottom_indices_end;
- while (bi != 0 && bi -> key > hi) bi = bi -> desc_link;
- j = BOTTOM_SZ - 1;
- }
- while(bi != 0) {
- while (j >= 0) {
- hdr * hhdr = bi -> index[j];
- if (0 == hhdr) {
- --j;
- } else if (IS_FORWARDING_ADDR_OR_NIL(hhdr)) {
- j -= (signed_word)hhdr;
- } else {
- return((struct hblk *)
- (((bi -> key << LOG_BOTTOM_SZ) + j)
- << LOG_HBLKSIZE));
- }
- }
- j = BOTTOM_SZ - 1;
- bi = bi -> desc_link;
- }
- return(0);
-}
projects / msp430-gcc.git / blobdiff