| |
| /*--------------------------------------------------------------------*/ |
| /*--- An implementation of malloc/free which doesn't use sbrk. ---*/ |
| /*--- vg_malloc2.c ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright (C) 2000-2004 Julian Seward |
| jseward@acm.org |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307, USA. |
| |
| The GNU General Public License is contained in the file COPYING. |
| */ |
| |
| |
| #include "core.h" |
| //zz#include "memcheck/memcheck.h" |
| |
| //#define DEBUG_MALLOC // turn on heavyweight debugging machinery |
| //#define VERBOSE_MALLOC // make verbose, esp. in debugging machinery |
| |
| /*------------------------------------------------------------*/ |
| /*--- Main types ---*/ |
| /*------------------------------------------------------------*/ |
| |
| #define VG_N_MALLOC_LISTS 16 // do not change this |
| |
| // The amount you can ask for is limited only by sizeof(SizeT)... |
| #define MAX_PSZB (~((SizeT)0x0)) |
| |
| typedef UChar UByte; |
| |
| /* Block layout: |
| |
| this block total szB (sizeof(SizeT) bytes) |
| freelist previous ptr (sizeof(void*) bytes) |
| red zone bytes (depends on .rz_szB field of Arena) |
| (payload bytes) |
| red zone bytes (depends on .rz_szB field of Arena) |
| freelist next ptr (sizeof(void*) bytes) |
| this block total szB (sizeof(SizeT) bytes) |
| |
| Total size in bytes (bszB) and payload size in bytes (pszB) |
| are related by: |
| |
| bszB == pszB + 2*sizeof(SizeT) + 2*sizeof(void*) + 2*a->rz_szB |
| |
| Furthermore, both size fields in the block have their least-sifnificant |
| bit set if the block is not in use, and unset if it is in use. |
| (The bottom 3 or so bits are always free for this because of alignment.) |
| A block size of zero is not possible, because a block always has at |
| least two SizeTs and two pointers of overhead. |
| |
| Nb: All Block payloads must be VG_MIN_MALLOC_SZB-aligned. This is |
| achieved by ensuring that Superblocks are VG_MIN_MALLOC_SZB-aligned |
| (see newSuperblock() for how), and that the lengths of the following |
| things are a multiple of VG_MIN_MALLOC_SZB: |
| - Superblock admin section lengths (due to elastic padding) |
| - Block admin section (low and high) lengths (due to elastic redzones) |
| - Block payload lengths (due to req_pszB rounding up) |
| */ |
| typedef |
| struct { |
| // No fields are actually used in this struct, because a Block has |
| // loads of variable sized fields and so can't be accessed |
| // meaningfully with normal fields. So we use access functions all |
| // the time. This struct gives us a type to use, though. Also, we |
| // make sizeof(Block) 1 byte so that we can do arithmetic with the |
| // Block* type in increments of 1! |
| UByte dummy; |
| } |
| Block; |
| |
| // A superblock. 'padding' is never used, it just ensures that if the |
| // entire Superblock is aligned to VG_MIN_MALLOC_SZB, then payload_bytes[] |
| // will be too. It can add small amounts of padding unnecessarily -- eg. |
| // 8-bytes on 32-bit machines with an 8-byte VG_MIN_MALLOC_SZB -- because |
| // it's too hard to make a constant expression that works perfectly in all |
| // cases. |
| // payload_bytes[] is made a single big Block when the Superblock is |
| // created, and then can be split and the splittings remerged, but Blocks |
| // always cover its entire length -- there's never any unused bytes at the |
| // end, for example. |
| typedef |
| struct _Superblock { |
| struct _Superblock* next; |
| SizeT n_payload_bytes; |
| UByte padding[ VG_MIN_MALLOC_SZB - |
| ((sizeof(struct _Superblock*) + sizeof(SizeT)) % |
| VG_MIN_MALLOC_SZB) ]; |
| UByte payload_bytes[0]; |
| } |
| Superblock; |
| |
| // An arena. 'freelist' is a circular, doubly-linked list. 'rz_szB' is |
| // elastic, in that it can be bigger than asked-for to ensure alignment. |
| typedef |
| struct { |
| Char* name; |
| Bool clientmem; // Allocates in the client address space? |
| SizeT rz_szB; // Red zone size in bytes |
| SizeT min_sblock_szB; // Minimum superblock size in bytes |
| Block* freelist[VG_N_MALLOC_LISTS]; |
| Superblock* sblocks; |
| // Stats only. |
| SizeT bytes_on_loan; |
| SizeT bytes_mmaped; |
| SizeT bytes_on_loan_max; |
| } |
| Arena; |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Low-level functions for working with Blocks. ---*/ |
| /*------------------------------------------------------------*/ |
| |
| #define SIZE_T_0x1 ((SizeT)0x1) |
| |
| // Mark a bszB as in-use, and not in-use. |
| static __inline__ |
| SizeT mk_inuse_bszB ( SizeT bszB ) |
| { |
| vg_assert(bszB != 0); |
| return bszB & (~SIZE_T_0x1); |
| } |
| static __inline__ |
| SizeT mk_free_bszB ( SizeT bszB ) |
| { |
| vg_assert(bszB != 0); |
| return bszB | SIZE_T_0x1; |
| } |
| |
| // Remove the in-use/not-in-use attribute from a bszB, leaving just |
| // the size. |
| static __inline__ |
| SizeT mk_plain_bszB ( SizeT bszB ) |
| { |
| vg_assert(bszB != 0); |
| return bszB & (~SIZE_T_0x1); |
| } |
| |
| // Does this bszB have the in-use attribute? |
| static __inline__ |
| Bool is_inuse_bszB ( SizeT bszB ) |
| { |
| vg_assert(bszB != 0); |
| return (0 != (bszB & SIZE_T_0x1)) ? False : True; |
| } |
| |
| |
| // Set and get the lower size field of a block. |
| static __inline__ |
| void set_bszB_lo ( Block* b, SizeT bszB ) |
| { |
| *(SizeT*)&b[0] = bszB; |
| } |
| static __inline__ |
| SizeT get_bszB_lo ( Block* b ) |
| { |
| return *(SizeT*)&b[0]; |
| } |
| |
| // Get the address of the last byte in a block |
| static __inline__ |
| UByte* last_byte ( Block* b ) |
| { |
| UByte* b2 = (UByte*)b; |
| return &b2[mk_plain_bszB(get_bszB_lo(b)) - 1]; |
| } |
| |
| // Set and get the upper size field of a block. |
| static __inline__ |
| void set_bszB_hi ( Block* b, SizeT bszB ) |
| { |
| UByte* b2 = (UByte*)b; |
| UByte* lb = last_byte(b); |
| vg_assert(lb == &b2[mk_plain_bszB(bszB) - 1]); |
| *(SizeT*)&lb[-sizeof(SizeT) + 1] = bszB; |
| } |
| static __inline__ |
| SizeT get_bszB_hi ( Block* b ) |
| { |
| UByte* lb = last_byte(b); |
| return *(SizeT*)&lb[-sizeof(SizeT) + 1]; |
| } |
| |
| |
| // Return the lower, upper and total overhead in bytes for a block. |
| // These are determined purely by which arena the block lives in. |
| static __inline__ |
| SizeT overhead_szB_lo ( Arena* a ) |
| { |
| return sizeof(SizeT) + sizeof(void*) + a->rz_szB; |
| } |
| static __inline__ |
| SizeT overhead_szB_hi ( Arena* a ) |
| { |
| return a->rz_szB + sizeof(void*) + sizeof(SizeT); |
| } |
| static __inline__ |
| SizeT overhead_szB ( Arena* a ) |
| { |
| return overhead_szB_lo(a) + overhead_szB_hi(a); |
| } |
| |
| // Given the addr of a block, return the addr of its payload. |
| static __inline__ |
| UByte* get_block_payload ( Arena* a, Block* b ) |
| { |
| UByte* b2 = (UByte*)b; |
| return & b2[ overhead_szB_lo(a) ]; |
| } |
| // Given the addr of a block's payload, return the addr of the block itself. |
| static __inline__ |
| Block* get_payload_block ( Arena* a, UByte* payload ) |
| { |
| return (Block*)&payload[ -overhead_szB_lo(a) ]; |
| } |
| |
| |
| // Set and get the next and previous link fields of a block. |
| static __inline__ |
| void set_prev_b ( Block* b, Block* prev_p ) |
| { |
| UByte* b2 = (UByte*)b; |
| *(Block**)&b2[sizeof(SizeT)] = prev_p; |
| } |
| static __inline__ |
| void set_next_b ( Block* b, Block* next_p ) |
| { |
| UByte* lb = last_byte(b); |
| *(Block**)&lb[-sizeof(SizeT) - sizeof(void*) + 1] = next_p; |
| } |
| static __inline__ |
| Block* get_prev_b ( Block* b ) |
| { |
| UByte* b2 = (UByte*)b; |
| return *(Block**)&b2[sizeof(SizeT)]; |
| } |
| static __inline__ |
| Block* get_next_b ( Block* b ) |
| { |
| UByte* lb = last_byte(b); |
| return *(Block**)&lb[-sizeof(SizeT) - sizeof(void*) + 1]; |
| } |
| |
| |
| // Get the block immediately preceding this one in the Superblock. |
| static __inline__ |
| Block* get_predecessor_block ( Block* b ) |
| { |
| UByte* b2 = (UByte*)b; |
| SizeT bszB = mk_plain_bszB( (*(SizeT*)&b2[-sizeof(SizeT)]) ); |
| return (Block*)&b2[-bszB]; |
| } |
| |
| // Read and write the lower and upper red-zone bytes of a block. |
| static __inline__ |
| void set_rz_lo_byte ( Arena* a, Block* b, UInt rz_byteno, UByte v ) |
| { |
| UByte* b2 = (UByte*)b; |
| b2[sizeof(SizeT) + sizeof(void*) + rz_byteno] = v; |
| } |
| static __inline__ |
| void set_rz_hi_byte ( Arena* a, Block* b, UInt rz_byteno, UByte v ) |
| { |
| UByte* lb = last_byte(b); |
| lb[-sizeof(SizeT) - sizeof(void*) - rz_byteno] = v; |
| } |
| static __inline__ |
| UByte get_rz_lo_byte ( Arena* a, Block* b, UInt rz_byteno ) |
| { |
| UByte* b2 = (UByte*)b; |
| return b2[sizeof(SizeT) + sizeof(void*) + rz_byteno]; |
| } |
| static __inline__ |
| UByte get_rz_hi_byte ( Arena* a, Block* b, UInt rz_byteno ) |
| { |
| UByte* lb = last_byte(b); |
| return lb[-sizeof(SizeT) - sizeof(void*) - rz_byteno]; |
| } |
| |
| |
| // Return the minimum bszB for a block in this arena. Can have zero-length |
| // payloads, so it's the size of the admin bytes. |
| static __inline__ |
| SizeT min_useful_bszB ( Arena* a ) |
| { |
| return overhead_szB(a); |
| } |
| |
| // Convert payload size <--> block size (both in bytes). |
| static __inline__ |
| SizeT pszB_to_bszB ( Arena* a, SizeT pszB ) |
| { |
| return pszB + overhead_szB(a); |
| } |
| static __inline__ |
| SizeT bszB_to_pszB ( Arena* a, SizeT bszB ) |
| { |
| vg_assert(bszB >= overhead_szB(a)); |
| return bszB - overhead_szB(a); |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Arena management ---*/ |
| /*------------------------------------------------------------*/ |
| |
| #define CORE_ARENA_MIN_SZB 1048576 |
| |
| // The arena structures themselves. |
| static Arena vg_arena[VG_N_ARENAS]; |
| |
| // Functions external to this module identify arenas using ArenaIds, |
| // not Arena*s. This fn converts the former to the latter. |
| static Arena* arenaId_to_ArenaP ( ArenaId arena ) |
| { |
| vg_assert(arena >= 0 && arena < VG_N_ARENAS); |
| return & vg_arena[arena]; |
| } |
| |
| // Initialise an arena. rz_szB is the minimum redzone size; it might be |
| // made bigger to ensure that VG_MIN_MALLOC_ALIGNMENT is observed. |
| static |
| void arena_init ( ArenaId aid, Char* name, SizeT rz_szB, SizeT min_sblock_szB ) |
| { |
| SizeT i; |
| Arena* a = arenaId_to_ArenaP(aid); |
| |
| vg_assert(rz_szB < 128); // ensure reasonable size |
| vg_assert((min_sblock_szB % VKI_PAGE_SIZE) == 0); |
| a->name = name; |
| a->clientmem = ( VG_AR_CLIENT == aid ? True : False ); |
| |
| // The size of the low and high admin sections in a block must be a |
| // multiple of VG_MIN_MALLOC_ALIGNMENT. So we round up the asked-for |
| // redzone size if necessary to achieve this. |
| a->rz_szB = rz_szB; |
| while (0 != overhead_szB_lo(a) % VG_MIN_MALLOC_SZB) a->rz_szB++; |
| vg_assert(overhead_szB_lo(a) == overhead_szB_hi(a)); |
| |
| a->min_sblock_szB = min_sblock_szB; |
| for (i = 0; i < VG_N_MALLOC_LISTS; i++) a->freelist[i] = NULL; |
| a->sblocks = NULL; |
| a->bytes_on_loan = 0; |
| a->bytes_mmaped = 0; |
| a->bytes_on_loan_max = 0; |
| } |
| |
| /* Print vital stats for an arena. */ |
| void VG_(print_all_arena_stats) ( void ) |
| { |
| UInt i; |
| for (i = 0; i < VG_N_ARENAS; i++) { |
| Arena* a = arenaId_to_ArenaP(i); |
| VG_(message)(Vg_DebugMsg, |
| "AR %8s: %8d mmap'd, %8d/%8d max/curr", |
| a->name, a->bytes_mmaped, a->bytes_on_loan_max, a->bytes_on_loan |
| ); |
| } |
| } |
| |
| /* This library is self-initialising, as it makes this more self-contained, |
| less coupled with the outside world. Hence VG_(arena_malloc)() and |
| VG_(arena_free)() below always call ensure_mm_init() to ensure things are |
| correctly initialised. */ |
| static |
| void ensure_mm_init ( void ) |
| { |
| static SizeT client_rz_szB; |
| static Bool init_done = False; |
| |
| if (init_done) { |
| // Make sure the client arena's redzone size never changes. Could |
| // happen if VG_(arena_malloc) was called too early, ie. before the |
| // tool was loaded. |
| vg_assert(client_rz_szB == VG_(vg_malloc_redzone_szB)); |
| return; |
| } |
| |
| /* No particular reason for this figure, it's just smallish */ |
| tl_assert(VG_(vg_malloc_redzone_szB) < 128); |
| client_rz_szB = VG_(vg_malloc_redzone_szB); |
| |
| /* Use checked red zones (of various sizes) for our internal stuff, |
| and an unchecked zone of arbitrary size for the client. Of |
| course the client's red zone can be checked by the tool, eg. |
| by using addressibility maps, but not by the mechanism implemented |
| here, which merely checks at the time of freeing that the red |
| zone bytes are unchanged. |
| |
| Nb: redzone sizes are *minimums*; they could be made bigger to ensure |
| alignment. Eg. on 32-bit machines, 4 becomes 8, and 12 becomes 16; |
| but on 64-bit machines 4 stays as 4, and 12 stays as 12 --- the extra |
| 4 bytes in both are accounted for by the larger prev/next ptr. |
| */ |
| arena_init ( VG_AR_CORE, "core", 4, CORE_ARENA_MIN_SZB ); |
| arena_init ( VG_AR_TOOL, "tool", 4, 1048576 ); |
| arena_init ( VG_AR_SYMTAB, "symtab", 4, 1048576 ); |
| arena_init ( VG_AR_JITTER, "JITter", 4, 32768 ); |
| arena_init ( VG_AR_CLIENT, "client", client_rz_szB, 1048576 ); |
| arena_init ( VG_AR_DEMANGLE, "demangle", 12/*paranoid*/, 65536 ); |
| arena_init ( VG_AR_EXECTXT, "exectxt", 4, 65536 ); |
| arena_init ( VG_AR_ERRORS, "errors", 4, 65536 ); |
| arena_init ( VG_AR_TRANSIENT, "transien", 4, 65536 ); |
| |
| init_done = True; |
| # ifdef DEBUG_MALLOC |
| VG_(sanity_check_malloc_all)(); |
| # endif |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Superblock management ---*/ |
| /*------------------------------------------------------------*/ |
| |
| // Align ptr p upwards to an align-sized boundary. |
| static |
| void* align_upwards ( void* p, SizeT align ) |
| { |
| Addr a = (Addr)p; |
| if ((a % align) == 0) return (void*)a; |
| return (void*)(a - (a % align) + align); |
| } |
| |
| // If not enough memory available, either aborts (for non-client memory) |
| // or returns 0 (for client memory). |
| static |
| Superblock* newSuperblock ( Arena* a, SizeT cszB ) |
| { |
| // The extra VG_MIN_MALLOC_SZB bytes are for possible alignment up. |
| static UByte bootstrap_superblock[CORE_ARENA_MIN_SZB+VG_MIN_MALLOC_SZB]; |
| static Bool called_before = True; //False; |
| Superblock* sb; |
| |
| // Take into account admin bytes in the Superblock. |
| cszB += sizeof(Superblock); |
| |
| if (cszB < a->min_sblock_szB) cszB = a->min_sblock_szB; |
| while ((cszB % VKI_PAGE_SIZE) > 0) cszB++; |
| |
| if (!called_before) { |
| // First time we're called -- use the special static bootstrap |
| // superblock (see comment at top of main() for details). |
| called_before = True; |
| vg_assert(a == arenaId_to_ArenaP(VG_AR_CORE)); |
| vg_assert(CORE_ARENA_MIN_SZB >= cszB); |
| // Ensure sb is suitably aligned. |
| sb = (Superblock*)align_upwards( bootstrap_superblock, |
| VG_MIN_MALLOC_SZB ); |
| } else if (a->clientmem) { |
| // client allocation -- return 0 to client if it fails |
| sb = (Superblock *) |
| VG_(client_alloc)(0, cszB, |
| VKI_PROT_READ|VKI_PROT_WRITE|VKI_PROT_EXEC, 0); |
| if (NULL == sb) |
| return 0; |
| } else { |
| // non-client allocation -- aborts if it fails |
| sb = VG_(get_memory_from_mmap) ( cszB, "newSuperblock" ); |
| } |
| vg_assert(NULL != sb); |
| //zzVALGRIND_MAKE_WRITABLE(sb, cszB); |
| vg_assert(0 == (Addr)sb % VG_MIN_MALLOC_SZB); |
| sb->n_payload_bytes = cszB - sizeof(Superblock); |
| a->bytes_mmaped += cszB; |
| if (0) |
| VG_(message)(Vg_DebugMsg, "newSuperblock, %d payload bytes", |
| sb->n_payload_bytes); |
| return sb; |
| } |
| |
| // Find the superblock containing the given chunk. |
| static |
| Superblock* findSb ( Arena* a, Block* b ) |
| { |
| Superblock* sb; |
| for (sb = a->sblocks; sb; sb = sb->next) |
| if ((Block*)&sb->payload_bytes[0] <= b |
| && b < (Block*)&sb->payload_bytes[sb->n_payload_bytes]) |
| return sb; |
| VG_(printf)("findSb: can't find pointer %p in arena `%s'\n", b, a->name ); |
| VG_(core_panic)("findSb: VG_(arena_free)() in wrong arena?"); |
| return NULL; /*NOTREACHED*/ |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Command line options ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* Round malloc sizes up to a multiple of VG_SLOPPY_MALLOC_SZB bytes? |
| default: NO |
| Nb: the allocator always rounds blocks up to a multiple of |
| VG_MIN_MALLOC_SZB. VG_(clo_sloppy_malloc) is relevant eg. for |
| Memcheck, which will be byte-precise with addressability maps on its |
| malloc allocations unless --sloppy-malloc=yes. */ |
| Bool VG_(clo_sloppy_malloc) = False; |
| |
| /* DEBUG: print malloc details? default: NO */ |
| Bool VG_(clo_trace_malloc) = False; |
| |
| /* Minimum alignment in functions that don't specify alignment explicitly. |
| default: 0, i.e. use VG_MIN_MALLOC_SZB. */ |
| UInt VG_(clo_alignment) = VG_MIN_MALLOC_SZB; |
| |
| |
| Bool VG_(replacement_malloc_process_cmd_line_option)(Char* arg) |
| { |
| if (VG_CLO_STREQN(12, arg, "--alignment=")) { |
| VG_(clo_alignment) = (UInt)VG_(atoll)(&arg[12]); |
| |
| if (VG_(clo_alignment) < VG_MIN_MALLOC_SZB |
| || VG_(clo_alignment) > 4096 |
| || VG_(log2)( VG_(clo_alignment) ) == -1 /* not a power of 2 */) { |
| VG_(message)(Vg_UserMsg, ""); |
| VG_(message)(Vg_UserMsg, |
| "Invalid --alignment= setting. " |
| "Should be a power of 2, >= %d, <= 4096.", VG_MIN_MALLOC_SZB); |
| VG_(bad_option)("--alignment"); |
| } |
| } |
| |
| else VG_BOOL_CLO("--sloppy-malloc", VG_(clo_sloppy_malloc)) |
| else VG_BOOL_CLO("--trace-malloc", VG_(clo_trace_malloc)) |
| else |
| return False; |
| |
| return True; |
| } |
| |
| void VG_(replacement_malloc_print_usage)(void) |
| { |
| VG_(printf)( |
| " --sloppy-malloc=no|yes round malloc sizes to multiple of %d? [no]\n" |
| " --alignment=<number> set minimum alignment of allocations [%d]\n", |
| VG_SLOPPY_MALLOC_SZB, VG_MIN_MALLOC_SZB |
| ); |
| } |
| |
| void VG_(replacement_malloc_print_debug_usage)(void) |
| { |
| VG_(printf)( |
| " --trace-malloc=no|yes show client malloc details? [no]\n" |
| ); |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Functions for working with freelists. ---*/ |
| /*------------------------------------------------------------*/ |
| |
| // Nb: Determination of which freelist a block lives on is based on the |
| // payload size, not block size. |
| |
| // Convert a payload size in bytes to a freelist number. |
| static |
| UInt pszB_to_listNo ( SizeT pszB ) |
| { |
| vg_assert(0 == pszB % VG_MIN_MALLOC_SZB); |
| pszB /= VG_MIN_MALLOC_SZB; |
| if (pszB <= 2) return 0; |
| if (pszB <= 3) return 1; |
| if (pszB <= 4) return 2; |
| if (pszB <= 5) return 3; |
| if (pszB <= 6) return 4; |
| if (pszB <= 7) return 5; |
| if (pszB <= 8) return 6; |
| if (pszB <= 9) return 7; |
| if (pszB <= 10) return 8; |
| if (pszB <= 11) return 9; |
| if (pszB <= 12) return 10; |
| if (pszB <= 16) return 11; |
| if (pszB <= 32) return 12; |
| if (pszB <= 64) return 13; |
| if (pszB <= 128) return 14; |
| return 15; |
| } |
| |
| // What is the minimum payload size for a given list? |
| static |
| SizeT listNo_to_pszB_min ( UInt listNo ) |
| { |
| SizeT pszB = 0; |
| vg_assert(listNo <= VG_N_MALLOC_LISTS); |
| while (pszB_to_listNo(pszB) < listNo) pszB += VG_MIN_MALLOC_SZB; |
| return pszB; |
| } |
| |
| // What is the maximum payload size for a given list? |
| static |
| SizeT listNo_to_pszB_max ( UInt listNo ) |
| { |
| vg_assert(listNo <= VG_N_MALLOC_LISTS); |
| if (listNo == VG_N_MALLOC_LISTS-1) { |
| return MAX_PSZB; |
| } else { |
| return listNo_to_pszB_min(listNo+1) - 1; |
| } |
| } |
| |
| |
| /* A nasty hack to try and reduce fragmentation. Try and replace |
| a->freelist[lno] with another block on the same list but with a |
| lower address, with the idea of attempting to recycle the same |
| blocks rather than cruise through the address space. */ |
| static |
| void swizzle ( Arena* a, UInt lno ) |
| { |
| Block* p_best; |
| Block* pp; |
| Block* pn; |
| UInt i; |
| |
| p_best = a->freelist[lno]; |
| if (p_best == NULL) return; |
| |
| pn = pp = p_best; |
| for (i = 0; i < 20; i++) { |
| pn = get_next_b(pn); |
| pp = get_prev_b(pp); |
| if (pn < p_best) p_best = pn; |
| if (pp < p_best) p_best = pp; |
| } |
| if (p_best < a->freelist[lno]) { |
| # ifdef VERBOSE_MALLOC |
| VG_(printf)("retreat by %d\n", a->freelist[lno] - p_best); |
| # endif |
| a->freelist[lno] = p_best; |
| } |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Sanity-check/debugging machinery. ---*/ |
| /*------------------------------------------------------------*/ |
| |
| #define VG_REDZONE_LO_MASK 0x31 |
| #define VG_REDZONE_HI_MASK 0x7c |
| |
| // Do some crude sanity checks on a Block. |
| static |
| Bool blockSane ( Arena* a, Block* b ) |
| { |
| # define BLEAT(str) VG_(printf)("blockSane: fail -- %s\n",str) |
| UInt i; |
| if (get_bszB_lo(b) != get_bszB_hi(b)) |
| {BLEAT("sizes");return False;} |
| if (!a->clientmem && is_inuse_bszB(get_bszB_lo(b))) { |
| for (i = 0; i < a->rz_szB; i++) { |
| if (get_rz_lo_byte(a, b, i) != |
| (UByte)(((Addr)b&0xff) ^ VG_REDZONE_LO_MASK)) |
| {BLEAT("redzone-lo");return False;} |
| if (get_rz_hi_byte(a, b, i) != |
| (UByte)(((Addr)b&0xff) ^ VG_REDZONE_HI_MASK)) |
| {BLEAT("redzone-hi");return False;} |
| } |
| } |
| return True; |
| # undef BLEAT |
| } |
| |
| // Print superblocks (only for debugging). |
| static |
| void ppSuperblocks ( Arena* a ) |
| { |
| UInt i, blockno; |
| SizeT b_bszB; |
| Block* b; |
| Superblock* sb = a->sblocks; |
| blockno = 1; |
| |
| while (sb) { |
| VG_(printf)( "\n" ); |
| VG_(printf)( "superblock %d at %p, sb->n_pl_bs = %d, next = %p\n", |
| blockno++, sb, sb->n_payload_bytes, sb->next ); |
| for (i = 0; i < sb->n_payload_bytes; i += mk_plain_bszB(b_bszB)) { |
| b = (Block*)&sb->payload_bytes[i]; |
| b_bszB = get_bszB_lo(b); |
| VG_(printf)( " block at %d, bszB %d: ", i, mk_plain_bszB(b_bszB) ); |
| VG_(printf)( "%s, ", is_inuse_bszB(b_bszB) ? "inuse" : "free"); |
| VG_(printf)( "%s\n", blockSane(a, b) ? "ok" : "BAD" ); |
| } |
| vg_assert(i == sb->n_payload_bytes); // no overshoot at end of Sb |
| sb = sb->next; |
| } |
| VG_(printf)( "end of superblocks\n\n" ); |
| } |
| |
| // Sanity check both the superblocks and the chains. |
| static void sanity_check_malloc_arena ( ArenaId aid ) |
| { |
| UInt i, superblockctr, blockctr_sb, blockctr_li; |
| UInt blockctr_sb_free, listno; |
| SizeT b_bszB, b_pszB, list_min_pszB, list_max_pszB; |
| Superblock* sb; |
| Bool thisFree, lastWasFree; |
| Block* b; |
| Block* b_prev; |
| SizeT arena_bytes_on_loan; |
| Arena* a; |
| |
| # define BOMB VG_(core_panic)("sanity_check_malloc_arena") |
| |
| a = arenaId_to_ArenaP(aid); |
| |
| // First, traverse all the superblocks, inspecting the Blocks in each. |
| superblockctr = blockctr_sb = blockctr_sb_free = 0; |
| arena_bytes_on_loan = 0; |
| sb = a->sblocks; |
| while (sb) { |
| lastWasFree = False; |
| superblockctr++; |
| for (i = 0; i < sb->n_payload_bytes; i += mk_plain_bszB(b_bszB)) { |
| blockctr_sb++; |
| b = (Block*)&sb->payload_bytes[i]; |
| b_bszB = get_bszB_lo(b); |
| if (!blockSane(a, b)) { |
| VG_(printf)("sanity_check_malloc_arena: sb %p, block %d (bszB %d): " |
| " BAD\n", sb, i, b_bszB ); |
| BOMB; |
| } |
| thisFree = !is_inuse_bszB(b_bszB); |
| if (thisFree && lastWasFree) { |
| VG_(printf)("sanity_check_malloc_arena: sb %p, block %d (bszB %d): " |
| "UNMERGED FREES\n", |
| sb, i, b_bszB ); |
| BOMB; |
| } |
| if (thisFree) blockctr_sb_free++; |
| if (!thisFree) |
| arena_bytes_on_loan += bszB_to_pszB(a, b_bszB); |
| lastWasFree = thisFree; |
| } |
| if (i > sb->n_payload_bytes) { |
| VG_(printf)( "sanity_check_malloc_arena: sb %p: last block " |
| "overshoots end\n", sb); |
| BOMB; |
| } |
| sb = sb->next; |
| } |
| |
| if (arena_bytes_on_loan != a->bytes_on_loan) { |
| # ifdef VERBOSE_MALLOC |
| VG_(printf)( "sanity_check_malloc_arena: a->bytes_on_loan %d, " |
| "arena_bytes_on_loan %d: " |
| "MISMATCH\n", a->bytes_on_loan, arena_bytes_on_loan); |
| # endif |
| ppSuperblocks(a); |
| BOMB; |
| } |
| |
| /* Second, traverse each list, checking that the back pointers make |
| sense, counting blocks encountered, and checking that each block |
| is an appropriate size for this list. */ |
| blockctr_li = 0; |
| for (listno = 0; listno < VG_N_MALLOC_LISTS; listno++) { |
| list_min_pszB = listNo_to_pszB_min(listno); |
| list_max_pszB = listNo_to_pszB_max(listno); |
| b = a->freelist[listno]; |
| if (b == NULL) continue; |
| while (True) { |
| b_prev = b; |
| b = get_next_b(b); |
| if (get_prev_b(b) != b_prev) { |
| VG_(printf)( "sanity_check_malloc_arena: list %d at %p: " |
| "BAD LINKAGE\n", |
| listno, b ); |
| BOMB; |
| } |
| b_pszB = bszB_to_pszB(a, mk_plain_bszB(get_bszB_lo(b))); |
| if (b_pszB < list_min_pszB || b_pszB > list_max_pszB) { |
| VG_(printf)( |
| "sanity_check_malloc_arena: list %d at %p: " |
| "WRONG CHAIN SIZE %dB (%dB, %dB)\n", |
| listno, b, b_pszB, list_min_pszB, list_max_pszB ); |
| BOMB; |
| } |
| blockctr_li++; |
| if (b == a->freelist[listno]) break; |
| } |
| } |
| |
| if (blockctr_sb_free != blockctr_li) { |
| # ifdef VERBOSE_MALLOC |
| VG_(printf)( "sanity_check_malloc_arena: BLOCK COUNT MISMATCH " |
| "(via sbs %d, via lists %d)\n", |
| blockctr_sb_free, blockctr_li ); |
| # endif |
| ppSuperblocks(a); |
| BOMB; |
| } |
| |
| if (VG_(clo_verbosity) > 2) |
| VG_(message)(Vg_DebugMsg, |
| "AR %8s: %2d sbs, %5d bs, %2d/%-2d free bs, " |
| "%7d mmap, %7d loan", |
| a->name, |
| superblockctr, |
| blockctr_sb, blockctr_sb_free, blockctr_li, |
| a->bytes_mmaped, a->bytes_on_loan); |
| # undef BOMB |
| } |
| |
| |
| void VG_(sanity_check_malloc_all) ( void ) |
| { |
| UInt i; |
| for (i = 0; i < VG_N_ARENAS; i++) |
| sanity_check_malloc_arena ( i ); |
| } |
| |
| /* Really, this isn't the right place for this. Nevertheless: find |
| out if an arena is empty -- currently has no bytes on loan. This |
| is useful for checking for memory leaks (of valgrind, not the |
| client.) */ |
| Bool VG_(is_empty_arena) ( ArenaId aid ) |
| { |
| Arena* a; |
| Superblock* sb; |
| Block* b; |
| SizeT b_bszB; |
| |
| ensure_mm_init(); |
| a = arenaId_to_ArenaP(aid); |
| for (sb = a->sblocks; sb != NULL; sb = sb->next) { |
| // If the superblock is empty, it should contain a single free |
| // block, of the right size. |
| b = (Block*)&sb->payload_bytes[0]; |
| b_bszB = get_bszB_lo(b); |
| if (is_inuse_bszB(b_bszB)) return False; |
| if (mk_plain_bszB(b_bszB) != sb->n_payload_bytes) return False; |
| // If we reach here, this block is not in use and is of the right |
| // size, so keep going around the loop... |
| } |
| return True; |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Creating and deleting blocks. ---*/ |
| /*------------------------------------------------------------*/ |
| |
| // Mark the bytes at b .. b+bszB-1 as not in use, and add them to the |
| // relevant free list. |
| |
| static |
| void mkFreeBlock ( Arena* a, Block* b, SizeT bszB, UInt b_lno ) |
| { |
| SizeT pszB = bszB_to_pszB(a, bszB); |
| vg_assert(b_lno == pszB_to_listNo(pszB)); |
| //zzVALGRIND_MAKE_WRITABLE(b, bszB); |
| // Set the size fields and indicate not-in-use. |
| set_bszB_lo(b, mk_free_bszB(bszB)); |
| set_bszB_hi(b, mk_free_bszB(bszB)); |
| |
| // Add to the relevant list. |
| if (a->freelist[b_lno] == NULL) { |
| set_prev_b(b, b); |
| set_next_b(b, b); |
| a->freelist[b_lno] = b; |
| } else { |
| Block* b_prev = get_prev_b(a->freelist[b_lno]); |
| Block* b_next = a->freelist[b_lno]; |
| set_next_b(b_prev, b); |
| set_prev_b(b_next, b); |
| set_next_b(b, b_next); |
| set_prev_b(b, b_prev); |
| } |
| # ifdef DEBUG_MALLOC |
| (void)blockSane(a,b); |
| # endif |
| } |
| |
| // Mark the bytes at b .. b+bszB-1 as in use, and set up the block |
| // appropriately. |
| static |
| void mkInuseBlock ( Arena* a, Block* b, SizeT bszB ) |
| { |
| UInt i; |
| vg_assert(bszB >= min_useful_bszB(a)); |
| //zzVALGRIND_MAKE_WRITABLE(b, bszB); |
| set_bszB_lo(b, mk_inuse_bszB(bszB)); |
| set_bszB_hi(b, mk_inuse_bszB(bszB)); |
| set_prev_b(b, NULL); // Take off freelist |
| set_next_b(b, NULL); // ditto |
| if (!a->clientmem) { |
| for (i = 0; i < a->rz_szB; i++) { |
| set_rz_lo_byte(a, b, i, (UByte)(((Addr)b&0xff) ^ VG_REDZONE_LO_MASK)); |
| set_rz_hi_byte(a, b, i, (UByte)(((Addr)b&0xff) ^ VG_REDZONE_HI_MASK)); |
| } |
| } |
| # ifdef DEBUG_MALLOC |
| (void)blockSane(a,b); |
| # endif |
| } |
| |
| // Remove a block from a given list. Does no sanity checking. |
| static |
| void unlinkBlock ( Arena* a, Block* b, UInt listno ) |
| { |
| vg_assert(listno < VG_N_MALLOC_LISTS); |
| if (get_prev_b(b) == b) { |
| // Only one element in the list; treat it specially. |
| vg_assert(get_next_b(b) == b); |
| a->freelist[listno] = NULL; |
| } else { |
| Block* b_prev = get_prev_b(b); |
| Block* b_next = get_next_b(b); |
| a->freelist[listno] = b_prev; |
| set_next_b(b_prev, b_next); |
| set_prev_b(b_next, b_prev); |
| swizzle ( a, listno ); |
| } |
| set_prev_b(b, NULL); |
| set_next_b(b, NULL); |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Core-visible functions. ---*/ |
| /*------------------------------------------------------------*/ |
| |
| // Align the request size. |
| static __inline__ |
| SizeT align_req_pszB ( SizeT req_pszB ) |
| { |
| SizeT n = VG_MIN_MALLOC_SZB-1; |
| return ((req_pszB + n) & (~n)); |
| } |
| |
| void* VG_(arena_malloc) ( ArenaId aid, SizeT req_pszB ) |
| { |
| SizeT req_bszB, frag_bszB, b_bszB; |
| UInt lno; |
| Superblock* new_sb; |
| Block* b = NULL; |
| Arena* a; |
| void* v; |
| |
| VGP_PUSHCC(VgpMalloc); |
| |
| ensure_mm_init(); |
| a = arenaId_to_ArenaP(aid); |
| |
| vg_assert(req_pszB < MAX_PSZB); |
| req_pszB = align_req_pszB(req_pszB); |
| req_bszB = pszB_to_bszB(a, req_pszB); |
| |
| // Scan through all the big-enough freelists for a block. |
| for (lno = pszB_to_listNo(req_pszB); lno < VG_N_MALLOC_LISTS; lno++) { |
| b = a->freelist[lno]; |
| if (NULL == b) continue; // If this list is empty, try the next one. |
| while (True) { |
| b_bszB = mk_plain_bszB(get_bszB_lo(b)); |
| if (b_bszB >= req_bszB) goto obtained_block; // success! |
| b = get_next_b(b); |
| if (b == a->freelist[lno]) break; // traversed entire freelist |
| } |
| } |
| |
| // If we reach here, no suitable block found, allocate a new superblock |
| vg_assert(lno == VG_N_MALLOC_LISTS); |
| new_sb = newSuperblock(a, req_bszB); |
| if (NULL == new_sb) { |
| // Should only fail if for client, otherwise, should have aborted |
| // already. |
| vg_assert(VG_AR_CLIENT == aid); |
| return NULL; |
| } |
| new_sb->next = a->sblocks; |
| a->sblocks = new_sb; |
| b = (Block*)&new_sb->payload_bytes[0]; |
| lno = pszB_to_listNo(bszB_to_pszB(a, new_sb->n_payload_bytes)); |
| mkFreeBlock ( a, b, new_sb->n_payload_bytes, lno); |
| // fall through |
| |
| obtained_block: |
| // Ok, we can allocate from b, which lives in list lno. |
| vg_assert(b != NULL); |
| vg_assert(lno < VG_N_MALLOC_LISTS); |
| vg_assert(a->freelist[lno] != NULL); |
| b_bszB = mk_plain_bszB(get_bszB_lo(b)); |
| // req_bszB is the size of the block we are after. b_bszB is the |
| // size of what we've actually got. */ |
| vg_assert(b_bszB >= req_bszB); |
| |
| // Could we split this block and still get a useful fragment? |
| frag_bszB = b_bszB - req_bszB; |
| if (frag_bszB >= min_useful_bszB(a)) { |
| // Yes, split block in two, put the fragment on the appropriate free |
| // list, and update b_bszB accordingly. |
| // printf( "split %dB into %dB and %dB\n", b_bszB, req_bszB, frag_bszB ); |
| unlinkBlock(a, b, lno); |
| mkInuseBlock(a, b, req_bszB); |
| mkFreeBlock(a, &b[req_bszB], frag_bszB, |
| pszB_to_listNo(bszB_to_pszB(a, frag_bszB))); |
| b_bszB = mk_plain_bszB(get_bszB_lo(b)); |
| } else { |
| // No, mark as in use and use as-is. |
| unlinkBlock(a, b, lno); |
| mkInuseBlock(a, b, b_bszB); |
| } |
| |
| // Update stats |
| a->bytes_on_loan += bszB_to_pszB(a, b_bszB); |
| if (a->bytes_on_loan > a->bytes_on_loan_max) |
| a->bytes_on_loan_max = a->bytes_on_loan; |
| |
| # ifdef DEBUG_MALLOC |
| sanity_check_malloc_arena(aid); |
| # endif |
| |
| VGP_POPCC(VgpMalloc); |
| v = get_block_payload(a, b); |
| vg_assert( (((Addr)v) & (VG_MIN_MALLOC_SZB-1)) == 0 ); |
| |
| VALGRIND_MALLOCLIKE_BLOCK(v, req_pszB, 0, False); |
| return v; |
| } |
| |
| |
| void VG_(arena_free) ( ArenaId aid, void* ptr ) |
| { |
| Superblock* sb; |
| UByte* sb_start; |
| UByte* sb_end; |
| Block* other; |
| Block* b; |
| SizeT b_bszB, b_pszB, other_bszB; |
| UInt b_listno; |
| Arena* a; |
| |
| VGP_PUSHCC(VgpMalloc); |
| |
| ensure_mm_init(); |
| a = arenaId_to_ArenaP(aid); |
| |
| if (ptr == NULL) { |
| VGP_POPCC(VgpMalloc); |
| return; |
| } |
| |
| b = get_payload_block(a, ptr); |
| |
| # ifdef DEBUG_MALLOC |
| vg_assert(blockSane(a, b)); |
| # endif |
| |
| a->bytes_on_loan -= bszB_to_pszB(a, mk_plain_bszB(get_bszB_lo(b))); |
| |
| sb = findSb( a, b ); |
| sb_start = &sb->payload_bytes[0]; |
| sb_end = &sb->payload_bytes[sb->n_payload_bytes - 1]; |
| |
| // Put this chunk back on a list somewhere. |
| b_bszB = get_bszB_lo(b); |
| b_pszB = bszB_to_pszB(a, b_bszB); |
| b_listno = pszB_to_listNo(b_pszB); |
| mkFreeBlock( a, b, b_bszB, b_listno ); |
| |
| // See if this block can be merged with its successor. |
| // First test if we're far enough before the superblock's end to possibly |
| // have a successor. |
| other = b + b_bszB; |
| if (other+min_useful_bszB(a)-1 <= (Block*)sb_end) { |
| // Ok, we have a successor, merge if it's not in use. |
| other_bszB = get_bszB_lo(other); |
| if (!is_inuse_bszB(other_bszB)) { |
| // VG_(printf)( "merge-successor\n"); |
| other_bszB = mk_plain_bszB(other_bszB); |
| # ifdef DEBUG_MALLOC |
| vg_assert(blockSane(a, other)); |
| # endif |
| unlinkBlock( a, b, b_listno ); |
| unlinkBlock( a, other, pszB_to_listNo(bszB_to_pszB(a,other_bszB)) ); |
| b_bszB += other_bszB; |
| b_listno = pszB_to_listNo(bszB_to_pszB(a, b_bszB)); |
| mkFreeBlock( a, b, b_bszB, b_listno ); |
| } |
| } else { |
| // Not enough space for successor: check that b is the last block |
| // ie. there are no unused bytes at the end of the Superblock. |
| vg_assert(other-1 == (Block*)sb_end); |
| } |
| |
| // Then see if this block can be merged with its predecessor. |
| // First test if we're far enough after the superblock's start to possibly |
| // have a predecessor. |
| if (b >= (Block*)sb_start + min_useful_bszB(a)) { |
| // Ok, we have a predecessor, merge if it's not in use. |
| other = get_predecessor_block( b ); |
| other_bszB = get_bszB_lo(other); |
| if (!is_inuse_bszB(other_bszB)) { |
| // VG_(printf)( "merge-predecessor\n"); |
| other_bszB = mk_plain_bszB(other_bszB); |
| unlinkBlock( a, b, b_listno ); |
| unlinkBlock( a, other, pszB_to_listNo(bszB_to_pszB(a, other_bszB)) ); |
| b = other; |
| b_bszB += other_bszB; |
| b_listno = pszB_to_listNo(bszB_to_pszB(a, b_bszB)); |
| mkFreeBlock( a, b, b_bszB, b_listno ); |
| } |
| } else { |
| // Not enough space for predecessor: check that b is the first block, |
| // ie. there are no unused bytes at the start of the Superblock. |
| vg_assert((Block*)sb_start == b); |
| } |
| |
| # ifdef DEBUG_MALLOC |
| sanity_check_malloc_arena(aid); |
| # endif |
| |
| VALGRIND_FREELIKE_BLOCK(ptr, 0); |
| |
| VGP_POPCC(VgpMalloc); |
| } |
| |
| |
| /* |
| The idea for malloc_aligned() is to allocate a big block, base, and |
| then split it into two parts: frag, which is returned to the the |
| free pool, and align, which is the bit we're really after. Here's |
| a picture. L and H denote the block lower and upper overheads, in |
| bytes. The details are gruesome. Note it is slightly complicated |
| because the initial request to generate base may return a bigger |
| block than we asked for, so it is important to distinguish the base |
| request size and the base actual size. |
| |
| frag_b align_b |
| | | |
| | frag_p | align_p |
| | | | | |
| v v v v |
| |
| +---+ +---+---+ +---+ |
| | L |----------------| H | L |---------------| H | |
| +---+ +---+---+ +---+ |
| |
| ^ ^ ^ |
| | | : |
| | base_p this addr must be aligned |
| | |
| base_b |
| |
| . . . . . . . |
| <------ frag_bszB -------> . . . |
| . <------------- base_pszB_act -----------> . |
| . . . . . . . |
| |
| */ |
| void* VG_(arena_malloc_aligned) ( ArenaId aid, SizeT req_alignB, SizeT req_pszB ) |
| { |
| SizeT base_pszB_req, base_pszB_act, frag_bszB; |
| Block *base_b, *align_b; |
| UByte *base_p, *align_p; |
| SizeT saved_bytes_on_loan; |
| Arena* a; |
| |
| VGP_PUSHCC(VgpMalloc); |
| |
| ensure_mm_init(); |
| a = arenaId_to_ArenaP(aid); |
| |
| vg_assert(req_pszB < MAX_PSZB); |
| |
| // Check that the requested alignment seems reasonable; that is, is |
| // a power of 2. |
| if (req_alignB < VG_MIN_MALLOC_SZB |
| || req_alignB > 1048576 |
| || VG_(log2)( VG_(clo_alignment) ) == -1 /* not a power of 2 */) { |
| VG_(printf)("VG_(arena_malloc_aligned)(%p, %d, %d)\nbad alignment", |
| a, req_alignB, req_pszB ); |
| VG_(core_panic)("VG_(arena_malloc_aligned)"); |
| /*NOTREACHED*/ |
| } |
| // Paranoid |
| vg_assert(req_alignB % VG_MIN_MALLOC_SZB == 0); |
| |
| /* Required payload size for the aligned chunk. */ |
| req_pszB = align_req_pszB(req_pszB); |
| |
| /* Payload size to request for the big block that we will split up. */ |
| base_pszB_req = req_pszB + min_useful_bszB(a) + req_alignB; |
| |
| /* Payload ptr for the block we are going to split. Note this |
| changes a->bytes_on_loan; we save and restore it ourselves. */ |
| saved_bytes_on_loan = a->bytes_on_loan; |
| base_p = VG_(arena_malloc) ( aid, base_pszB_req ); |
| a->bytes_on_loan = saved_bytes_on_loan; |
| |
| /* Block ptr for the block we are going to split. */ |
| base_b = get_payload_block ( a, base_p ); |
| |
| /* Pointer to the payload of the aligned block we are going to |
| return. This has to be suitably aligned. */ |
| align_p = align_upwards ( base_b + 2 * overhead_szB_lo(a) |
| + overhead_szB_hi(a), |
| req_alignB ); |
| align_b = get_payload_block(a, align_p); |
| |
| /* The block size of the fragment we will create. This must be big |
| enough to actually create a fragment. */ |
| frag_bszB = align_b - base_b; |
| |
| vg_assert(frag_bszB >= min_useful_bszB(a)); |
| |
| /* The actual payload size of the block we are going to split. */ |
| base_pszB_act = bszB_to_pszB(a, mk_plain_bszB(get_bszB_lo(base_b))); |
| |
| /* Create the fragment block, and put it back on the relevant free list. */ |
| mkFreeBlock ( a, base_b, frag_bszB, |
| pszB_to_listNo(bszB_to_pszB(a, frag_bszB)) ); |
| |
| /* Create the aligned block. */ |
| mkInuseBlock ( a, align_b, |
| base_p + base_pszB_act |
| + overhead_szB_hi(a) - (UByte*)align_b ); |
| |
| /* Final sanity checks. */ |
| vg_assert( is_inuse_bszB(get_bszB_lo(get_payload_block(a, align_p))) ); |
| |
| vg_assert(req_pszB |
| <= |
| bszB_to_pszB(a, mk_plain_bszB(get_bszB_lo( |
| get_payload_block(a, align_p)))) |
| ); |
| |
| a->bytes_on_loan |
| += bszB_to_pszB(a, mk_plain_bszB(get_bszB_lo( |
| get_payload_block(a, align_p)))); |
| if (a->bytes_on_loan > a->bytes_on_loan_max) |
| a->bytes_on_loan_max = a->bytes_on_loan; |
| |
| # ifdef DEBUG_MALLOC |
| sanity_check_malloc_arena(aid); |
| # endif |
| |
| VGP_POPCC(VgpMalloc); |
| |
| vg_assert( (((Addr)align_p) % req_alignB) == 0 ); |
| |
| VALGRIND_MALLOCLIKE_BLOCK(align_p, req_pszB, 0, False); |
| |
| return align_p; |
| } |
| |
| |
| SizeT VG_(arena_payload_szB) ( ArenaId aid, void* ptr ) |
| { |
| Arena* a = arenaId_to_ArenaP(aid); |
| Block* b = get_payload_block(a, ptr); |
| return bszB_to_pszB(a, get_bszB_lo(b)); |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Services layered on top of malloc/free. ---*/ |
| /*------------------------------------------------------------*/ |
| |
| void* VG_(arena_calloc) ( ArenaId aid, SizeT alignB, SizeT nmemb, |
| SizeT bytes_per_memb ) |
| { |
| SizeT size; |
| UChar* p; |
| |
| VGP_PUSHCC(VgpMalloc); |
| |
| size = nmemb * bytes_per_memb; |
| vg_assert(size >= nmemb && size >= bytes_per_memb);// check against overflow |
| |
| if (alignB == VG_MIN_MALLOC_SZB) |
| p = VG_(arena_malloc) ( aid, size ); |
| else |
| p = VG_(arena_malloc_aligned) ( aid, alignB, size ); |
| |
| VG_(memset)(p, 0, size); |
| |
| VALGRIND_MALLOCLIKE_BLOCK(p, size, 0, True); |
| |
| VGP_POPCC(VgpMalloc); |
| |
| return p; |
| } |
| |
| |
| void* VG_(arena_realloc) ( ArenaId aid, void* ptr, |
| SizeT req_alignB, SizeT req_pszB ) |
| { |
| Arena* a; |
| SizeT old_bszB, old_pszB; |
| UChar *p_new; |
| Block* b; |
| |
| VGP_PUSHCC(VgpMalloc); |
| |
| ensure_mm_init(); |
| a = arenaId_to_ArenaP(aid); |
| |
| vg_assert(req_pszB < MAX_PSZB); |
| |
| b = get_payload_block(a, ptr); |
| vg_assert(blockSane(a, b)); |
| |
| old_bszB = get_bszB_lo(b); |
| vg_assert(is_inuse_bszB(old_bszB)); |
| old_bszB = mk_plain_bszB(old_bszB); |
| old_pszB = bszB_to_pszB(a, old_bszB); |
| |
| if (req_pszB <= old_pszB) { |
| VGP_POPCC(VgpMalloc); |
| return ptr; |
| } |
| |
| if (req_alignB == VG_MIN_MALLOC_SZB) |
| p_new = VG_(arena_malloc) ( aid, req_pszB ); |
| else { |
| p_new = VG_(arena_malloc_aligned) ( aid, req_alignB, req_pszB ); |
| } |
| |
| VG_(memcpy)(p_new, ptr, old_pszB); |
| |
| VG_(arena_free)(aid, ptr); |
| |
| VGP_POPCC(VgpMalloc); |
| return p_new; |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Tool-visible functions. ---*/ |
| /*------------------------------------------------------------*/ |
| |
| // All just wrappers to avoid exposing arenas to tools. |
| |
| void* VG_(malloc) ( SizeT nbytes ) |
| { |
| return VG_(arena_malloc) ( VG_AR_TOOL, nbytes ); |
| } |
| |
| void VG_(free) ( void* ptr ) |
| { |
| VG_(arena_free) ( VG_AR_TOOL, ptr ); |
| } |
| |
| void* VG_(calloc) ( SizeT nmemb, SizeT bytes_per_memb ) |
| { |
| return VG_(arena_calloc) ( VG_AR_TOOL, VG_MIN_MALLOC_SZB, nmemb, |
| bytes_per_memb ); |
| } |
| |
| void* VG_(realloc) ( void* ptr, SizeT size ) |
| { |
| return VG_(arena_realloc) ( VG_AR_TOOL, ptr, VG_MIN_MALLOC_SZB, size ); |
| } |
| |
| void* VG_(malloc_aligned) ( SizeT req_alignB, SizeT req_pszB ) |
| { |
| return VG_(arena_malloc_aligned) ( VG_AR_TOOL, req_alignB, req_pszB ); |
| } |
| |
| |
| void* VG_(cli_malloc) ( SizeT align, SizeT nbytes ) |
| { |
| // 'align' should be valid by now. VG_(arena_malloc_aligned)() will |
| // abort if it's not. |
| if (VG_MIN_MALLOC_SZB == align) |
| return VG_(arena_malloc) ( VG_AR_CLIENT, nbytes ); |
| else |
| return VG_(arena_malloc_aligned) ( VG_AR_CLIENT, align, nbytes ); |
| } |
| |
| void VG_(cli_free) ( void* p ) |
| { |
| VG_(arena_free) ( VG_AR_CLIENT, p ); |
| } |
| |
| |
| Bool VG_(addr_is_in_block)( Addr a, Addr start, SizeT size ) |
| { |
| return (start - VG_(vg_malloc_redzone_szB) <= a |
| && a < start + size + VG_(vg_malloc_redzone_szB)); |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- The original test driver machinery. ---*/ |
| /*------------------------------------------------------------*/ |
| |
| #if 0 |
| |
| #if 1 |
| #define N_TEST_TRANSACTIONS 100000000 |
| #define N_TEST_ARR 200000 |
| #define M_TEST_MALLOC 1000 |
| #else |
| #define N_TEST_TRANSACTIONS 500000 |
| #define N_TEST_ARR 30000 |
| #define M_TEST_MALLOC 500 |
| #endif |
| |
| |
| void* test_arr[N_TEST_ARR]; |
| |
| int main ( int argc, char** argv ) |
| { |
| Int i, j, k, nbytes, qq; |
| unsigned char* chp; |
| Arena* a = &arena[VG_AR_CORE]; |
| srandom(1); |
| for (i = 0; i < N_TEST_ARR; i++) |
| test_arr[i] = NULL; |
| |
| for (i = 0; i < N_TEST_TRANSACTIONS; i++) { |
| if (i % 50000 == 0) mallocSanityCheck(a); |
| j = random() % N_TEST_ARR; |
| if (test_arr[j]) { |
| vg_free(a, test_arr[j]); |
| test_arr[j] = NULL; |
| } else { |
| nbytes = 1 + random() % M_TEST_MALLOC; |
| qq = random()%64; |
| if (qq == 32) |
| nbytes *= 17; |
| else if (qq == 33) |
| nbytes = 0; |
| test_arr[j] |
| = (i % 17) == 0 |
| ? vg_memalign(a, nbytes, 1<< (3+(random()%10))) |
| : vg_malloc( a, nbytes ); |
| chp = test_arr[j]; |
| for (k = 0; k < nbytes; k++) |
| chp[k] = (unsigned char)(k + 99); |
| } |
| } |
| |
| |
| for (i = 0; i < N_TEST_ARR; i++) { |
| if (test_arr[i]) { |
| vg_free(a, test_arr[i]); |
| test_arr[i] = NULL; |
| } |
| } |
| mallocSanityCheck(a); |
| |
| fprintf(stderr, "ALL DONE\n"); |
| |
| show_arena_stats(a); |
| fprintf(stderr, "%d max useful, %d bytes mmap'd (%4.1f%%), %d useful\n", |
| a->bytes_on_loan_max, |
| a->bytes_mmaped, |
| 100.0 * (double)a->bytes_on_loan_max / (double)a->bytes_mmaped, |
| a->bytes_on_loan ); |
| |
| return 0; |
| } |
| #endif /* 0 */ |
| |
| |
| /*--------------------------------------------------------------------*/ |
| /*--- end vg_malloc2.c ---*/ |
| /*--------------------------------------------------------------------*/ |