mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
fa20edc44d
- Remove most __ASSEMBLER__ __LINKER__ ifdefs - Rename libc/intrin/bits.h to libc/serialize.h - Block pthread cancelation in fchmodat() polyfill - Remove `clang-format off` statements in third_party
85 lines
2 KiB
PHP
85 lines
2 KiB
PHP
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/* ----------------------- Operations on smallbins ----------------------- */
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/*
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Various forms of linking and unlinking are defined as macros. Even
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the ones for trees, which are very long but have very short typical
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paths. This is ugly but reduces reliance on inlining support of
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compilers.
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*/
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/* Link a free chunk into a smallbin */
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#define insert_small_chunk(M, P, S) {\
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bindex_t I = small_index(S);\
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mchunkptr B = smallbin_at(M, I);\
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mchunkptr F = B;\
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assert(S >= MIN_CHUNK_SIZE);\
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if (!smallmap_is_marked(M, I))\
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mark_smallmap(M, I);\
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else if (RTCHECK(ok_address(M, B->fd)))\
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F = B->fd;\
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else {\
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CORRUPTION_ERROR_ACTION(M);\
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}\
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B->fd = P;\
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F->bk = P;\
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P->fd = F;\
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P->bk = B;\
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}
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/* Unlink a chunk from a smallbin */
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#define unlink_small_chunk(M, P, S) {\
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mchunkptr F = P->fd;\
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mchunkptr B = P->bk;\
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bindex_t I = small_index(S);\
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assert(P != B);\
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assert(P != F);\
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assert(chunksize(P) == small_index2size(I));\
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if (RTCHECK(F == smallbin_at(M,I) || (ok_address(M, F) && F->bk == P))) { \
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if (B == F) {\
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clear_smallmap(M, I);\
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}\
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else if (RTCHECK(B == smallbin_at(M,I) ||\
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(ok_address(M, B) && B->fd == P))) {\
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F->bk = B;\
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B->fd = F;\
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}\
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else {\
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CORRUPTION_ERROR_ACTION(M);\
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}\
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}\
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else {\
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CORRUPTION_ERROR_ACTION(M);\
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}\
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}
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/* Unlink the first chunk from a smallbin */
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#define unlink_first_small_chunk(M, B, P, I) {\
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mchunkptr F = P->fd;\
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assert(P != B);\
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assert(P != F);\
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assert(chunksize(P) == small_index2size(I));\
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if (B == F) {\
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clear_smallmap(M, I);\
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}\
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else if (RTCHECK(ok_address(M, F) && F->bk == P)) {\
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F->bk = B;\
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B->fd = F;\
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}\
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else {\
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CORRUPTION_ERROR_ACTION(M);\
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}\
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}
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/* Replace dv node, binning the old one */
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/* Used only when dvsize known to be small */
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#define replace_dv(M, P, S) {\
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size_t DVS = M->dvsize;\
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assert(is_small(DVS));\
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if (DVS != 0) {\
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mchunkptr DV = M->dv;\
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insert_small_chunk(M, DV, DVS);\
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}\
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M->dvsize = S;\
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M->dv = P;\
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}
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