9c8bbe6849
Block objects [1] are a C-level syntactic and runtime feature. They are similar to standard C functions, but in addition to executable code they may also contain variable bindings to automatic (stack) or managed (heap) memory. A block can therefore maintain a set of state (data) that it can use to impact behavior when executed. This port is based on Apple's GCC 5646 with some bugfixes from Apple GCC 5666.3. It has some small differences with the support in clang, which remains the recommended compiler. Perhaps the most notable difference is that in GCC that __block is not actually a keyword, but a macro. There will be workaround for this issue in a near future. Other issues can be consulted in the clang documentation [2] For better compatiblity with Apple's GCC and llvm-gcc some related fixes and features from Apple have been included. Support for the non-standard nested functions in GCC is now off by default. No effort was made to update the ObjC support since FreeBSD doesn't carry ObjC in the base system, but some of the code crept in and was more difficult to remove than to adjust. Reference: [1] https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Blocks/Articles/00_Introduction.html [2] http://clang.llvm.org/compatibility.html#block-variable-initialization Obtained from: Apple GCC 4.2 MFC after: 3 weeks
320 lines
12 KiB
C
320 lines
12 KiB
C
/* Garbage collection for the GNU compiler.
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
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Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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#ifndef GCC_GGC_H
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#define GCC_GGC_H
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#include "statistics.h"
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/* Symbols are marked with `ggc' for `gcc gc' so as not to interfere with
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an external gc library that might be linked in. */
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/* Constants for general use. */
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extern const char empty_string[]; /* empty string */
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extern const char digit_vector[]; /* "0" .. "9" */
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#define digit_string(d) (digit_vector + ((d) * 2))
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/* Internal functions and data structures used by the GTY
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machinery. */
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/* The first parameter is a pointer to a pointer, the second a cookie. */
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typedef void (*gt_pointer_operator) (void *, void *);
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#include "gtype-desc.h"
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/* One of these applies its third parameter (with cookie in the fourth
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parameter) to each pointer in the object pointed to by the first
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parameter, using the second parameter. */
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typedef void (*gt_note_pointers) (void *, void *, gt_pointer_operator,
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void *);
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/* One of these is called before objects are re-ordered in memory.
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The first parameter is the original object, the second is the
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subobject that has had its pointers reordered, the third parameter
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can compute the new values of a pointer when given the cookie in
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the fourth parameter. */
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typedef void (*gt_handle_reorder) (void *, void *, gt_pointer_operator,
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void *);
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/* Used by the gt_pch_n_* routines. Register an object in the hash table. */
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extern int gt_pch_note_object (void *, void *, gt_note_pointers,
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enum gt_types_enum);
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/* Used by the gt_pch_n_* routines. Register that an object has a reorder
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function. */
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extern void gt_pch_note_reorder (void *, void *, gt_handle_reorder);
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/* Mark the object in the first parameter and anything it points to. */
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typedef void (*gt_pointer_walker) (void *);
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/* Structures for the easy way to mark roots.
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In an array, terminated by having base == NULL. */
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struct ggc_root_tab {
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void *base;
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size_t nelt;
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size_t stride;
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gt_pointer_walker cb;
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gt_pointer_walker pchw;
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};
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#define LAST_GGC_ROOT_TAB { NULL, 0, 0, NULL, NULL }
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/* Pointers to arrays of ggc_root_tab, terminated by NULL. */
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extern const struct ggc_root_tab * const gt_ggc_rtab[];
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extern const struct ggc_root_tab * const gt_ggc_deletable_rtab[];
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extern const struct ggc_root_tab * const gt_pch_cache_rtab[];
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extern const struct ggc_root_tab * const gt_pch_scalar_rtab[];
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/* Structure for hash table cache marking. */
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struct htab;
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struct ggc_cache_tab {
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struct htab * *base;
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size_t nelt;
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size_t stride;
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gt_pointer_walker cb;
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gt_pointer_walker pchw;
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int (*marked_p) (const void *);
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};
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#define LAST_GGC_CACHE_TAB { NULL, 0, 0, NULL, NULL, NULL }
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/* Pointers to arrays of ggc_cache_tab, terminated by NULL. */
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extern const struct ggc_cache_tab * const gt_ggc_cache_rtab[];
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/* If EXPR is not NULL and previously unmarked, mark it and evaluate
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to true. Otherwise evaluate to false. */
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#define ggc_test_and_set_mark(EXPR) \
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((EXPR) != NULL && ((void *) (EXPR)) != (void *) 1 && ! ggc_set_mark (EXPR))
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#define ggc_mark(EXPR) \
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do { \
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const void *const a__ = (EXPR); \
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if (a__ != NULL && a__ != (void *) 1) \
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ggc_set_mark (a__); \
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} while (0)
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/* Actually set the mark on a particular region of memory, but don't
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follow pointers. This function is called by ggc_mark_*. It
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returns zero if the object was not previously marked; nonzero if
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the object was already marked, or if, for any other reason,
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pointers in this data structure should not be traversed. */
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extern int ggc_set_mark (const void *);
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/* Return 1 if P has been marked, zero otherwise.
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P must have been allocated by the GC allocator; it mustn't point to
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static objects, stack variables, or memory allocated with malloc. */
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extern int ggc_marked_p (const void *);
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/* Mark the entries in the string pool. */
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extern void ggc_mark_stringpool (void);
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/* Call ggc_set_mark on all the roots. */
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extern void ggc_mark_roots (void);
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/* Save and restore the string pool entries for PCH. */
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extern void gt_pch_save_stringpool (void);
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extern void gt_pch_fixup_stringpool (void);
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extern void gt_pch_restore_stringpool (void);
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/* PCH and GGC handling for strings, mostly trivial. */
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extern void gt_pch_p_S (void *, void *, gt_pointer_operator, void *);
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extern void gt_pch_n_S (const void *);
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extern void gt_ggc_m_S (void *);
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/* Initialize the string pool. */
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extern void init_stringpool (void);
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/* A GC implementation must provide these functions. They are internal
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to the GC system. */
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/* Forward declare the zone structure. Only ggc_zone implements this. */
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struct alloc_zone;
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/* Initialize the garbage collector. */
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extern void init_ggc (void);
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/* Start a new GGC zone. */
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extern struct alloc_zone *new_ggc_zone (const char *);
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/* Free a complete GGC zone, destroying everything in it. */
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extern void destroy_ggc_zone (struct alloc_zone *);
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struct ggc_pch_data;
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/* Return a new ggc_pch_data structure. */
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extern struct ggc_pch_data *init_ggc_pch (void);
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/* The second parameter and third parameters give the address and size
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of an object. Update the ggc_pch_data structure with as much of
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that information as is necessary. The bool argument should be true
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if the object is a string. */
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extern void ggc_pch_count_object (struct ggc_pch_data *, void *, size_t, bool,
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enum gt_types_enum);
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/* Return the total size of the data to be written to hold all
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the objects previously passed to ggc_pch_count_object. */
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extern size_t ggc_pch_total_size (struct ggc_pch_data *);
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/* The objects, when read, will most likely be at the address
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in the second parameter. */
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extern void ggc_pch_this_base (struct ggc_pch_data *, void *);
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/* Assuming that the objects really do end up at the address
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passed to ggc_pch_this_base, return the address of this object.
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The bool argument should be true if the object is a string. */
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extern char *ggc_pch_alloc_object (struct ggc_pch_data *, void *, size_t, bool,
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enum gt_types_enum);
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/* Write out any initial information required. */
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extern void ggc_pch_prepare_write (struct ggc_pch_data *, FILE *);
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/* Write out this object, including any padding. The last argument should be
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true if the object is a string. */
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extern void ggc_pch_write_object (struct ggc_pch_data *, FILE *, void *,
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void *, size_t, bool);
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/* All objects have been written, write out any final information
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required. */
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extern void ggc_pch_finish (struct ggc_pch_data *, FILE *);
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/* A PCH file has just been read in at the address specified second
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parameter. Set up the GC implementation for the new objects. */
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extern void ggc_pch_read (FILE *, void *);
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/* Allocation. */
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/* When set, ggc_collect will do collection. */
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extern bool ggc_force_collect;
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/* The internal primitive. */
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extern void *ggc_alloc_stat (size_t MEM_STAT_DECL);
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#define ggc_alloc(s) ggc_alloc_stat (s MEM_STAT_INFO)
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/* Allocate an object of the specified type and size. */
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extern void *ggc_alloc_typed_stat (enum gt_types_enum, size_t MEM_STAT_DECL);
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#define ggc_alloc_typed(s,z) ggc_alloc_typed_stat (s,z MEM_STAT_INFO)
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/* Like ggc_alloc, but allocates cleared memory. */
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extern void *ggc_alloc_cleared_stat (size_t MEM_STAT_DECL);
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#define ggc_alloc_cleared(s) ggc_alloc_cleared_stat (s MEM_STAT_INFO)
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/* Resize a block. */
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extern void *ggc_realloc_stat (void *, size_t MEM_STAT_DECL);
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#define ggc_realloc(s,z) ggc_realloc_stat (s,z MEM_STAT_INFO)
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/* Like ggc_alloc_cleared, but performs a multiplication. */
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extern void *ggc_calloc (size_t, size_t);
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/* Free a block. To be used when known for certain it's not reachable. */
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extern void ggc_free (void *);
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extern void ggc_record_overhead (size_t, size_t, void * MEM_STAT_DECL);
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extern void ggc_free_overhead (void *);
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extern void ggc_prune_overhead_list (void);
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extern void dump_ggc_loc_statistics (void);
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/* Type-safe, C++-friendly versions of ggc_alloc() and gcc_calloc(). */
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#define GGC_NEW(T) ((T *) ggc_alloc (sizeof (T)))
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#define GGC_CNEW(T) ((T *) ggc_alloc_cleared (sizeof (T)))
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#define GGC_NEWVEC(T, N) ((T *) ggc_alloc ((N) * sizeof(T)))
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#define GGC_CNEWVEC(T, N) ((T *) ggc_alloc_cleared ((N) * sizeof(T)))
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#define GGC_NEWVAR(T, S) ((T *) ggc_alloc ((S)))
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#define GGC_CNEWVAR(T, S) ((T *) ggc_alloc_cleared ((S)))
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#define GGC_RESIZEVEC(T, P, N) ((T *) ggc_realloc ((P), (N) * sizeof (T)))
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#define ggc_alloc_rtvec(NELT) \
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((rtvec) ggc_alloc_zone (sizeof (struct rtvec_def) + ((NELT) - 1) \
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* sizeof (rtx), &rtl_zone))
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#define ggc_alloc_tree(LENGTH) ((tree) ggc_alloc_zone (LENGTH, &tree_zone))
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#define htab_create_ggc(SIZE, HASH, EQ, DEL) \
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htab_create_alloc (SIZE, HASH, EQ, DEL, ggc_calloc, NULL)
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#define splay_tree_new_ggc(COMPARE) \
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splay_tree_new_with_allocator (COMPARE, NULL, NULL, \
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&ggc_splay_alloc, &ggc_splay_dont_free, \
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NULL)
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extern void *ggc_splay_alloc (int, void *);
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extern void ggc_splay_dont_free (void *, void *);
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/* Allocate a gc-able string, and fill it with LENGTH bytes from CONTENTS.
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If LENGTH is -1, then CONTENTS is assumed to be a
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null-terminated string and the memory sized accordingly. */
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extern const char *ggc_alloc_string (const char *contents, int length);
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/* Make a copy of S, in GC-able memory. */
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#define ggc_strdup(S) ggc_alloc_string((S), -1)
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/* Invoke the collector. Garbage collection occurs only when this
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function is called, not during allocations. */
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extern void ggc_collect (void);
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/* Return the number of bytes allocated at the indicated address. */
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extern size_t ggc_get_size (const void *);
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/* Write out all GCed objects to F. */
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extern void gt_pch_save (FILE *f);
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/* Read objects previously saved with gt_pch_save from F. */
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extern void gt_pch_restore (FILE *f);
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/* Statistics. */
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/* This structure contains the statistics common to all collectors.
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Particular collectors can extend this structure. */
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typedef struct ggc_statistics
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{
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/* At present, we don't really gather any interesting statistics. */
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int unused;
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} ggc_statistics;
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/* Used by the various collectors to gather and print statistics that
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do not depend on the collector in use. */
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extern void ggc_print_common_statistics (FILE *, ggc_statistics *);
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/* Print allocation statistics. */
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extern void ggc_print_statistics (void);
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extern void stringpool_statistics (void);
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/* Heuristics. */
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extern int ggc_min_expand_heuristic (void);
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/* APPLE LOCAL begin retune gc params 6124839 */
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extern int ggc_min_heapsize_heuristic (bool);
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extern void init_ggc_heuristics (bool);
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/* APPLE LOCAL end retune gc params 6124839 */
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/* Zone collection. */
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#if defined (GGC_ZONE) && !defined (GENERATOR_FILE)
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/* For regular rtl allocations. */
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extern struct alloc_zone rtl_zone;
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/* For regular tree allocations. */
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extern struct alloc_zone tree_zone;
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/* For IDENTIFIER_NODE allocations. */
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extern struct alloc_zone tree_id_zone;
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/* Allocate an object into the specified allocation zone. */
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extern void *ggc_alloc_zone_stat (size_t, struct alloc_zone * MEM_STAT_DECL);
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# define ggc_alloc_zone(s,z) ggc_alloc_zone_stat (s,z MEM_STAT_INFO)
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# define ggc_alloc_zone_pass_stat(s,z) ggc_alloc_zone_stat (s,z PASS_MEM_STAT)
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#else
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# define ggc_alloc_zone(s, z) ggc_alloc (s)
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# define ggc_alloc_zone_pass_stat(s, z) ggc_alloc_stat (s PASS_MEM_STAT)
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#endif
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#endif
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