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Current Path: /opt/golang/1.19.4/src/runtime

📁 ..
📄 HACKING.md(15.29 KB)
📄 Makefile(178 B)
📄 abi_test.go(2.83 KB)
📄 alg.go(9.45 KB)
📄 align_runtime_test.go(2.73 KB)
📄 align_test.go(5.26 KB)
📁 asan
📄 asan.go(1.55 KB)
📄 asan0.go(761 B)
📄 asan_amd64.s(2.46 KB)
📄 asan_arm64.s(2.15 KB)
📄 asan_riscv64.s(1.92 KB)
📄 asm.s(278 B)
📄 asm_386.s(40.43 KB)
📄 asm_amd64.h(411 B)
📄 asm_amd64.s(57.44 KB)
📄 asm_arm.s(30.2 KB)
📄 asm_arm64.s(41.41 KB)
📄 asm_loong64.s(21.79 KB)
📄 asm_mips64x.s(22.43 KB)
📄 asm_mipsx.s(24.41 KB)
📄 asm_ppc64x.h(1023 B)
📄 asm_ppc64x.s(35.21 KB)
📄 asm_riscv64.s(26.43 KB)
📄 asm_s390x.s(26.08 KB)
📄 asm_wasm.s(9.38 KB)
📄 atomic_arm64.s(259 B)
📄 atomic_loong64.s(245 B)
📄 atomic_mips64x.s(300 B)
📄 atomic_mipsx.s(262 B)
📄 atomic_pointer.go(2.62 KB)
📄 atomic_ppc64x.s(437 B)
📄 atomic_riscv64.s(275 B)
📄 auxv_none.go(298 B)
📄 callers_test.go(8.44 KB)
📁 cgo
📄 cgo.go(2 KB)
📄 cgo_mmap.go(2.4 KB)
📄 cgo_ppc64x.go(418 B)
📄 cgo_sigaction.go(3.28 KB)
📄 cgocall.go(19.12 KB)
📄 cgocallback.go(317 B)
📄 cgocheck.go(6.86 KB)
📄 chan.go(23.73 KB)
📄 chan_test.go(23.37 KB)
📄 chanbarrier_test.go(1.4 KB)
📄 checkptr.go(3.29 KB)
📄 checkptr_test.go(2.73 KB)
📄 closure_test.go(937 B)
📄 compiler.go(410 B)
📄 complex.go(1.59 KB)
📄 complex_test.go(1.05 KB)
📄 conv_wasm_test.go(2.96 KB)
📄 cpuflags.go(810 B)
📄 cpuflags_amd64.go(533 B)
📄 cpuflags_arm64.go(334 B)
📄 cpuprof.go(7.78 KB)
📄 cputicks.go(449 B)
📄 crash_cgo_test.go(18.14 KB)
📄 crash_test.go(21.77 KB)
📄 crash_unix_test.go(8.39 KB)
📁 debug
📄 debug.go(3.23 KB)
📄 debug_test.go(7.98 KB)
📄 debugcall.go(6.19 KB)
📄 debuglog.go(17.87 KB)
📄 debuglog_off.go(357 B)
📄 debuglog_on.go(1.09 KB)
📄 debuglog_test.go(4.56 KB)
📄 defer_test.go(11.56 KB)
📄 defs1_linux.go(845 B)
📄 defs1_netbsd_386.go(2.83 KB)
📄 defs1_netbsd_amd64.go(3.06 KB)
📄 defs1_netbsd_arm.go(2.94 KB)
📄 defs1_netbsd_arm64.go(3.17 KB)
📄 defs1_solaris_amd64.go(4 KB)
📄 defs2_linux.go(3.51 KB)
📄 defs3_linux.go(1.09 KB)
📄 defs_aix.go(4.16 KB)
📄 defs_aix_ppc64.go(3.61 KB)
📄 defs_arm_linux.go(2.67 KB)
📄 defs_darwin.go(3.78 KB)
📄 defs_darwin_amd64.go(6.07 KB)
📄 defs_darwin_arm64.go(3.89 KB)
📄 defs_dragonfly.go(2.59 KB)
📄 defs_dragonfly_amd64.go(3.29 KB)
📄 defs_freebsd.go(3.82 KB)
📄 defs_freebsd_386.go(4.36 KB)
📄 defs_freebsd_amd64.go(4.63 KB)
📄 defs_freebsd_arm.go(3.69 KB)
📄 defs_freebsd_arm64.go(4.01 KB)
📄 defs_illumos_amd64.go(285 B)
📄 defs_linux.go(3.25 KB)
📄 defs_linux_386.go(4.42 KB)
📄 defs_linux_amd64.go(4.93 KB)
📄 defs_linux_arm.go(4.11 KB)
📄 defs_linux_arm64.go(3.86 KB)
📄 defs_linux_loong64.go(3.68 KB)
📄 defs_linux_mips64x.go(3.85 KB)
📄 defs_linux_mipsx.go(3.83 KB)
📄 defs_linux_ppc64.go(3.93 KB)
📄 defs_linux_ppc64le.go(3.93 KB)
📄 defs_linux_riscv64.go(4.06 KB)
📄 defs_linux_s390x.go(3.41 KB)
📄 defs_netbsd.go(2.72 KB)
📄 defs_netbsd_386.go(855 B)
📄 defs_netbsd_amd64.go(1.01 KB)
📄 defs_netbsd_arm.go(764 B)
📄 defs_openbsd.go(3.09 KB)
📄 defs_openbsd_386.go(2.87 KB)
📄 defs_openbsd_amd64.go(3.07 KB)
📄 defs_openbsd_arm.go(2.99 KB)
📄 defs_openbsd_arm64.go(2.74 KB)
📄 defs_openbsd_mips64.go(2.64 KB)
📄 defs_plan9_386.go(1.63 KB)
📄 defs_plan9_amd64.go(1.82 KB)
📄 defs_plan9_arm.go(1.73 KB)
📄 defs_solaris.go(3.31 KB)
📄 defs_solaris_amd64.go(1004 B)
📄 defs_windows.go(2.09 KB)
📄 defs_windows_386.go(1.98 KB)
📄 defs_windows_amd64.go(2.71 KB)
📄 defs_windows_arm.go(2.11 KB)
📄 defs_windows_arm64.go(2.63 KB)
📄 duff_386.s(8.24 KB)
📄 duff_amd64.s(5.62 KB)
📄 duff_arm.s(7.11 KB)
📄 duff_arm64.s(5.27 KB)
📄 duff_loong64.s(12 KB)
📄 duff_mips64x.s(11.28 KB)
📄 duff_ppc64x.s(7.06 KB)
📄 duff_riscv64.s(11.4 KB)
📄 duff_s390x.s(507 B)
📄 env_plan9.go(3 KB)
📄 env_posix.go(1.79 KB)
📄 env_test.go(1.16 KB)
📄 error.go(9.21 KB)
📄 example_test.go(1.55 KB)
📄 export_aix_test.go(234 B)
📄 export_arm_test.go(226 B)
📄 export_darwin_test.go(382 B)
📄 export_debug_amd64_test.go(3.6 KB)
📄 export_debug_arm64_test.go(3.49 KB)
📄 export_debug_test.go(5.05 KB)
📄 export_debuglog_test.go(1.24 KB)
📄 export_linux_test.go(550 B)
📄 export_mmap_test.go(429 B)
📄 export_pipe2_test.go(310 B)
📄 export_pipe_test.go(219 B)
📄 export_solaris_test.go(282 B)
📄 export_test.go(38.87 KB)
📄 export_unix_test.go(2.18 KB)
📄 export_windows_test.go(677 B)
📄 extern.go(13.62 KB)
📄 fastlog2.go(1.22 KB)
📄 fastlog2_test.go(784 B)
📄 fastlog2table.go(904 B)
📄 float.go(1.35 KB)
📄 float_test.go(699 B)
📄 funcdata.h(2.55 KB)
📄 gc_test.go(20.04 KB)
📄 gcinfo_test.go(5.59 KB)
📄 go_tls.h(366 B)
📄 hash32.go(1.58 KB)
📄 hash64.go(1.95 KB)
📄 hash_test.go(16.77 KB)
📄 heapdump.go(17.65 KB)
📄 histogram.go(6.19 KB)
📄 histogram_test.go(3.42 KB)
📄 iface.go(15.66 KB)
📄 iface_test.go(7.45 KB)
📁 internal
📄 lfstack.go(1.77 KB)
📄 lfstack_32bit.go(532 B)
📄 lfstack_64bit.go(2.18 KB)
📄 lfstack_test.go(2.77 KB)
📄 libfuzzer.go(6.5 KB)
📄 libfuzzer_amd64.s(5.01 KB)
📄 libfuzzer_arm64.s(3.15 KB)
📄 lock_futex.go(5.19 KB)
📄 lock_js.go(6.14 KB)
📄 lock_sema.go(6.74 KB)
📄 lockrank.go(13.26 KB)
📄 lockrank_off.go(1.14 KB)
📄 lockrank_on.go(9.83 KB)
📄 lockrank_test.go(1.15 KB)
📄 malloc.go(51.01 KB)
📄 malloc_test.go(10.78 KB)
📄 map.go(43.52 KB)
📄 map_benchmark_test.go(10.48 KB)
📄 map_fast32.go(12.72 KB)
📄 map_fast64.go(12.91 KB)
📄 map_faststr.go(14.3 KB)
📄 map_test.go(27.44 KB)
📄 mbarrier.go(12.43 KB)
📄 mbitmap.go(66.08 KB)
📄 mcache.go(10 KB)
📄 mcentral.go(7.9 KB)
📄 mcheckmark.go(2.81 KB)
📄 mem.go(6.23 KB)
📄 mem_aix.go(1.9 KB)
📄 mem_bsd.go(2.03 KB)
📄 mem_darwin.go(1.84 KB)
📄 mem_js.go(2.25 KB)
📄 mem_linux.go(6.15 KB)
📄 mem_plan9.go(4.32 KB)
📄 mem_windows.go(3.76 KB)
📄 memclr_386.s(2.38 KB)
📄 memclr_amd64.s(4.91 KB)
📄 memclr_arm.s(2.6 KB)
📄 memclr_arm64.s(3.62 KB)
📄 memclr_loong64.s(778 B)
📄 memclr_mips64x.s(1.72 KB)
📄 memclr_mipsx.s(1.32 KB)
📄 memclr_plan9_386.s(983 B)
📄 memclr_plan9_amd64.s(511 B)
📄 memclr_ppc64x.s(4.23 KB)
📄 memclr_riscv64.s(978 B)
📄 memclr_s390x.s(1.96 KB)
📄 memclr_wasm.s(622 B)
📄 memmove_386.s(4.42 KB)
📄 memmove_amd64.s(12.48 KB)
📄 memmove_arm.s(5.9 KB)
📄 memmove_arm64.s(5.96 KB)
📄 memmove_linux_amd64_test.go(1.6 KB)
📄 memmove_loong64.s(1.8 KB)
📄 memmove_mips64x.s(1.83 KB)
📄 memmove_mipsx.s(4.4 KB)
📄 memmove_plan9_386.s(3.06 KB)
📄 memmove_plan9_amd64.s(3.04 KB)
📄 memmove_ppc64x.s(4.58 KB)
📄 memmove_riscv64.s(1.86 KB)
📄 memmove_s390x.s(2.92 KB)
📄 memmove_test.go(14.03 KB)
📄 memmove_wasm.s(1.74 KB)
📁 metrics
📄 metrics.go(18.71 KB)
📄 metrics_test.go(14.74 KB)
📄 mfinal.go(16.34 KB)
📄 mfinal_test.go(6.19 KB)
📄 mfixalloc.go(3.07 KB)
📄 mgc.go(56.37 KB)
📄 mgclimit.go(17.26 KB)
📄 mgclimit_test.go(9.02 KB)
📄 mgcmark.go(47.47 KB)
📄 mgcpacer.go(60.12 KB)
📄 mgcpacer_test.go(40.43 KB)
📄 mgcscavenge.go(41.29 KB)
📄 mgcscavenge_test.go(20.33 KB)
📄 mgcstack.go(10.58 KB)
📄 mgcsweep.go(27.89 KB)
📄 mgcwork.go(12.86 KB)
📄 mheap.go(69.14 KB)
📄 mkduff.go(8.01 KB)
📄 mkfastlog2table.go(3.08 KB)
📄 mkpreempt.go(15.12 KB)
📄 mksizeclasses.go(9.3 KB)
📄 mmap.go(821 B)
📄 mpagealloc.go(36.84 KB)
📄 mpagealloc_32bit.go(3.81 KB)
📄 mpagealloc_64bit.go(9.44 KB)
📄 mpagealloc_test.go(32.59 KB)
📄 mpagecache.go(5.46 KB)
📄 mpagecache_test.go(10.79 KB)
📄 mpallocbits.go(12.6 KB)
📄 mpallocbits_test.go(13.69 KB)
📄 mprof.go(38.51 KB)
📄 mranges.go(13.64 KB)
📄 mranges_test.go(5.68 KB)
📁 msan
📄 msan.go(1.5 KB)
📄 msan0.go(725 B)
📄 msan_amd64.s(2.31 KB)
📄 msan_arm64.s(1.99 KB)
📄 msize.go(777 B)
📄 mspanset.go(12.21 KB)
📄 mstats.go(30.07 KB)
📄 mwbbuf.go(9.28 KB)
📄 nbpipe_fcntl_libc_test.go(470 B)
📄 nbpipe_fcntl_unix_test.go(458 B)
📄 nbpipe_pipe.go(405 B)
📄 nbpipe_pipe2.go(344 B)
📄 nbpipe_pipe_test.go(706 B)
📄 nbpipe_test.go(1.68 KB)
📄 net_plan9.go(645 B)
📄 netpoll.go(18.27 KB)
📄 netpoll_aix.go(4.83 KB)
📄 netpoll_epoll.go(4.16 KB)
📄 netpoll_fake.go(652 B)
📄 netpoll_kqueue.go(4.56 KB)
📄 netpoll_os_test.go(360 B)
📄 netpoll_solaris.go(10.76 KB)
📄 netpoll_stub.go(1.41 KB)
📄 netpoll_windows.go(3.75 KB)
📄 norace_linux_test.go(915 B)
📄 norace_test.go(983 B)
📄 numcpu_freebsd_test.go(381 B)
📄 os2_aix.go(20.45 KB)
📄 os2_freebsd.go(302 B)
📄 os2_openbsd.go(296 B)
📄 os2_plan9.go(1.48 KB)
📄 os2_solaris.go(320 B)
📄 os3_plan9.go(3.93 KB)
📄 os3_solaris.go(17.22 KB)
📄 os_aix.go(8.61 KB)
📄 os_android.go(463 B)
📄 os_darwin.go(12 KB)
📄 os_darwin_arm64.go(416 B)
📄 os_dragonfly.go(6.96 KB)
📄 os_freebsd.go(11.61 KB)
📄 os_freebsd2.go(603 B)
📄 os_freebsd_amd64.go(658 B)
📄 os_freebsd_arm.go(1.32 KB)
📄 os_freebsd_arm64.go(398 B)
📄 os_freebsd_noauxv.go(241 B)
📄 os_illumos.go(3.93 KB)
📄 os_js.go(3.28 KB)
📄 os_linux.go(26.14 KB)
📄 os_linux_arm.go(1.35 KB)
📄 os_linux_arm64.go(556 B)
📄 os_linux_be64.go(824 B)
📄 os_linux_generic.go(888 B)
📄 os_linux_loong64.go(485 B)
📄 os_linux_mips64x.go(1.07 KB)
📄 os_linux_mipsx.go(1.06 KB)
📄 os_linux_noauxv.go(337 B)
📄 os_linux_novdso.go(347 B)
📄 os_linux_ppc64x.go(526 B)
📄 os_linux_riscv64.go(198 B)
📄 os_linux_s390x.go(316 B)
📄 os_linux_x86.go(234 B)
📄 os_netbsd.go(9.8 KB)
📄 os_netbsd_386.go(617 B)
📄 os_netbsd_amd64.go(614 B)
📄 os_netbsd_arm.go(1.16 KB)
📄 os_netbsd_arm64.go(856 B)
📄 os_nonopenbsd.go(437 B)
📄 os_only_solaris.go(357 B)
📄 os_openbsd.go(6.55 KB)
📄 os_openbsd_arm.go(749 B)
📄 os_openbsd_arm64.go(416 B)
📄 os_openbsd_libc.go(1.71 KB)
📄 os_openbsd_mips64.go(416 B)
📄 os_openbsd_syscall.go(1.27 KB)
📄 os_openbsd_syscall1.go(441 B)
📄 os_openbsd_syscall2.go(2.46 KB)
📄 os_plan9.go(10.3 KB)
📄 os_plan9_arm.go(462 B)
📄 os_solaris.go(6.55 KB)
📄 os_windows.go(44.43 KB)
📄 os_windows_arm.go(511 B)
📄 os_windows_arm64.go(339 B)
📄 panic.go(40.25 KB)
📄 panic32.go(4.8 KB)
📄 panic_test.go(1.71 KB)
📄 plugin.go(4.26 KB)
📁 pprof
📄 preempt.go(15.21 KB)
📄 preempt_386.s(824 B)
📄 preempt_amd64.s(1.62 KB)
📄 preempt_arm.s(1.48 KB)
📄 preempt_arm64.s(1.97 KB)
📄 preempt_loong64.s(2.35 KB)
📄 preempt_mips64x.s(2.72 KB)
📄 preempt_mipsx.s(2.68 KB)
📄 preempt_nonwindows.go(290 B)
📄 preempt_ppc64x.s(2.72 KB)
📄 preempt_riscv64.s(2.26 KB)
📄 preempt_s390x.s(1.01 KB)
📄 preempt_wasm.s(176 B)
📄 print.go(5.95 KB)
📄 proc.go(176.84 KB)
📄 proc_runtime_test.go(1.38 KB)
📄 proc_test.go(25.66 KB)
📄 profbuf.go(18.26 KB)
📄 profbuf_test.go(8.65 KB)
📄 proflabel.go(1.52 KB)
📁 race
📄 race.go(18.58 KB)
📄 race0.go(2.79 KB)
📄 race_amd64.s(13.82 KB)
📄 race_arm64.s(14.21 KB)
📄 race_ppc64le.s(17.89 KB)
📄 race_s390x.s(12 KB)
📄 rand_test.go(907 B)
📄 rdebug.go(553 B)
📄 relax_stub.go(598 B)
📄 rt0_aix_ppc64.s(4.33 KB)
📄 rt0_android_386.s(822 B)
📄 rt0_android_amd64.s(754 B)
📄 rt0_android_arm.s(843 B)
📄 rt0_android_arm64.s(941 B)
📄 rt0_darwin_amd64.s(399 B)
📄 rt0_darwin_arm64.s(1.69 KB)
📄 rt0_dragonfly_amd64.s(448 B)
📄 rt0_freebsd_386.s(454 B)
📄 rt0_freebsd_amd64.s(442 B)
📄 rt0_freebsd_arm.s(298 B)
📄 rt0_freebsd_arm64.s(1.88 KB)
📄 rt0_illumos_amd64.s(311 B)
📄 rt0_ios_amd64.s(425 B)
📄 rt0_ios_arm64.s(425 B)
📄 rt0_js_wasm.s(2.3 KB)
📄 rt0_linux_386.s(450 B)
📄 rt0_linux_amd64.s(307 B)
📄 rt0_linux_arm.s(1007 B)
📄 rt0_linux_arm64.s(1.81 KB)
📄 rt0_linux_loong64.s(716 B)
📄 rt0_linux_mips64x.s(1014 B)
📄 rt0_linux_mipsx.s(797 B)
📄 rt0_linux_ppc64.s(928 B)
📄 rt0_linux_ppc64le.s(4.35 KB)
📄 rt0_linux_riscv64.s(2.65 KB)
📄 rt0_linux_s390x.s(676 B)
📄 rt0_netbsd_386.s(452 B)
📄 rt0_netbsd_amd64.s(309 B)
📄 rt0_netbsd_arm.s(296 B)
📄 rt0_netbsd_arm64.s(1.8 KB)
📄 rt0_openbsd_386.s(454 B)
📄 rt0_openbsd_amd64.s(311 B)
📄 rt0_openbsd_arm.s(298 B)
📄 rt0_openbsd_arm64.s(1.96 KB)
📄 rt0_openbsd_mips64.s(976 B)
📄 rt0_plan9_386.s(523 B)
📄 rt0_plan9_amd64.s(481 B)
📄 rt0_plan9_arm.s(397 B)
📄 rt0_solaris_amd64.s(311 B)
📄 rt0_windows_386.s(1.28 KB)
📄 rt0_windows_amd64.s(986 B)
📄 rt0_windows_arm.s(386 B)
📄 rt0_windows_arm64.s(725 B)
📄 runtime-gdb.py(15.33 KB)
📄 runtime-gdb_test.go(20.93 KB)
📄 runtime-lldb_test.go(4.95 KB)
📄 runtime.go(1.45 KB)
📄 runtime1.go(13.06 KB)
📄 runtime2.go(43.07 KB)
📄 runtime_boring.go(606 B)
📄 runtime_linux_test.go(1.95 KB)
📄 runtime_mmap_test.go(1.77 KB)
📄 runtime_test.go(11.79 KB)
📄 runtime_unix_test.go(1.22 KB)
📄 rwmutex.go(3.53 KB)
📄 rwmutex_test.go(4.19 KB)
📄 select.go(14.84 KB)
📄 sema.go(16.16 KB)
📄 sema_test.go(4.21 KB)
📄 semasleep_test.go(3.05 KB)
📄 sigaction.go(489 B)
📄 signal_386.go(1.72 KB)
📄 signal_aix_ppc64.go(3.55 KB)
📄 signal_amd64.go(2.73 KB)
📄 signal_arm.go(2.54 KB)
📄 signal_arm64.go(3.21 KB)
📄 signal_darwin.go(2.13 KB)
📄 signal_darwin_amd64.go(4 KB)
📄 signal_darwin_arm64.go(3.6 KB)
📄 signal_dragonfly.go(2.17 KB)
📄 signal_dragonfly_amd64.go(2.01 KB)
📄 signal_freebsd.go(2.2 KB)
📄 signal_freebsd_386.go(1.55 KB)
📄 signal_freebsd_amd64.go(2.03 KB)
📄 signal_freebsd_arm.go(2.18 KB)
📄 signal_freebsd_arm64.go(3.23 KB)
📄 signal_linux_386.go(1.59 KB)
📄 signal_linux_amd64.go(2.05 KB)
📄 signal_linux_arm.go(2.12 KB)
📄 signal_linux_arm64.go(2.95 KB)
📄 signal_linux_loong64.go(3.22 KB)
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📄 sys_darwin.go(17.92 KB)
📄 sys_darwin_amd64.s(19.12 KB)
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📄 sys_freebsd_386.s(8.41 KB)
📄 sys_freebsd_amd64.s(10.7 KB)
📄 sys_freebsd_arm.s(10.12 KB)
📄 sys_freebsd_arm64.s(9.4 KB)
📄 sys_libc.go(1.84 KB)
📄 sys_linux_386.s(18.31 KB)
📄 sys_linux_amd64.s(16.57 KB)
📄 sys_linux_arm.s(16.12 KB)
📄 sys_linux_arm64.s(18.09 KB)
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📄 sys_linux_mipsx.s(11.09 KB)
📄 sys_linux_ppc64x.s(22.1 KB)
📄 sys_linux_riscv64.s(12.59 KB)
📄 sys_linux_s390x.s(13.78 KB)
📄 sys_loong64.go(489 B)
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📄 sys_mipsx.go(496 B)
📄 sys_netbsd_386.s(9.55 KB)
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📄 sys_netbsd_arm.s(10.41 KB)
📄 sys_netbsd_arm64.s(9.38 KB)
📄 sys_nonppc64x.go(245 B)
📄 sys_openbsd.go(2.59 KB)
📄 sys_openbsd1.go(1.23 KB)
📄 sys_openbsd2.go(8.36 KB)
📄 sys_openbsd3.go(3.37 KB)
📄 sys_openbsd_386.s(20.03 KB)
📄 sys_openbsd_amd64.s(16.64 KB)
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📄 sys_openbsd_arm64.s(14.84 KB)
📄 sys_openbsd_mips64.s(8.6 KB)
📄 sys_plan9_386.s(4.48 KB)
📄 sys_plan9_amd64.s(4.55 KB)
📄 sys_plan9_arm.s(7.03 KB)
📄 sys_ppc64x.go(532 B)
📄 sys_riscv64.go(469 B)
📄 sys_s390x.go(469 B)
📄 sys_solaris_amd64.s(6.42 KB)
📄 sys_wasm.go(754 B)
📄 sys_wasm.s(2.65 KB)
📄 sys_windows_386.s(7.65 KB)
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📄 sys_windows_arm.s(11.97 KB)
📄 sys_windows_arm64.s(11.45 KB)
📄 sys_x86.go(552 B)
📄 syscall2_solaris.go(1.65 KB)
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📄 syscall_windows.go(16.95 KB)
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📁 testdata
📄 textflag.h(1.52 KB)
📄 time.go(30.75 KB)
📄 time_fake.go(2.5 KB)
📄 time_linux_amd64.s(2.02 KB)
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📄 time_windows.h(753 B)
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📄 tls_arm.s(3.45 KB)
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📄 tls_arm64.s(1.2 KB)
📄 tls_loong64.s(589 B)
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📄 tls_s390x.s(1.55 KB)
📄 tls_stub.go(260 B)
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📄 trace.go(45.8 KB)
📄 traceback.go(48.18 KB)
📄 traceback_test.go(11.64 KB)
📄 type.go(17.43 KB)
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📄 utf8.go(3.39 KB)
📄 vdso_elf32.go(2.76 KB)
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📄 vdso_freebsd.go(2.44 KB)
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📄 vdso_in_none.go(443 B)
📄 vdso_linux.go(7.77 KB)
📄 vdso_linux_386.go(669 B)
📄 vdso_linux_amd64.go(685 B)
📄 vdso_linux_arm.go(669 B)
📄 vdso_linux_arm64.go(670 B)
📄 vdso_linux_loong64.go(793 B)
📄 vdso_linux_mips64x.go(850 B)
📄 vdso_linux_ppc64x.go(672 B)
📄 vdso_linux_riscv64.go(666 B)
📄 vdso_linux_s390x.go(681 B)
📄 vlop_386.s(2.02 KB)
📄 vlop_arm.s(7.06 KB)
📄 vlop_arm_test.go(3.75 KB)
📄 vlrt.go(6.71 KB)
📄 wincallback.go(3.45 KB)
📄 write_err.go(291 B)
📄 write_err_android.go(4.65 KB)
📄 zcallback_windows.go(155 B)
📄 zcallback_windows.s(63.02 KB)
📄 zcallback_windows_arm.s(89.32 KB)
📄 zcallback_windows_arm64.s(89.32 KB)

Editing: mksizeclasses.go

// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build ignore

// Generate tables for small malloc size classes.
//
// See malloc.go for overview.
//
// The size classes are chosen so that rounding an allocation
// request up to the next size class wastes at most 12.5% (1.125x).
//
// Each size class has its own page count that gets allocated
// and chopped up when new objects of the size class are needed.
// That page count is chosen so that chopping up the run of
// pages into objects of the given size wastes at most 12.5% (1.125x)
// of the memory. It is not necessary that the cutoff here be
// the same as above.
//
// The two sources of waste multiply, so the worst possible case
// for the above constraints would be that allocations of some
// size might have a 26.6% (1.266x) overhead.
// In practice, only one of the wastes comes into play for a
// given size (sizes < 512 waste mainly on the round-up,
// sizes > 512 waste mainly on the page chopping).
// For really small sizes, alignment constraints force the
// overhead higher.

package main

import (
	"bytes"
	"flag"
	"fmt"
	"go/format"
	"io"
	"log"
	"math"
	"math/bits"
	"os"
)

// Generate msize.go

var stdout = flag.Bool("stdout", false, "write to stdout instead of sizeclasses.go")

func main() {
	flag.Parse()

var b bytes.Buffer
	fmt.Fprintln(&b, "// Code generated by mksizeclasses.go; DO NOT EDIT.")
	fmt.Fprintln(&b, "//go:generate go run mksizeclasses.go")
	fmt.Fprintln(&b)
	fmt.Fprintln(&b, "package runtime")
	classes := makeClasses()

printComment(&b, classes)

printClasses(&b, classes)

out, err := format.Source(b.Bytes())
	if err != nil {
		log.Fatal(err)
	}
	if *stdout {
		_, err = os.Stdout.Write(out)
	} else {
		err = os.WriteFile("sizeclasses.go", out, 0666)
	}
	if err != nil {
		log.Fatal(err)
	}
}

const (
	// Constants that we use and will transfer to the runtime.
	maxSmallSize = 32 << 10
	smallSizeDiv = 8
	smallSizeMax = 1024
	largeSizeDiv = 128
	pageShift    = 13

// Derived constants.
	pageSize = 1 << pageShift
)

type class struct {
	size   int // max size
	npages int // number of pages
}

func powerOfTwo(x int) bool {
	return x != 0 && x&(x-1) == 0
}

func makeClasses() []class {
	var classes []class

classes = append(classes, class{}) // class #0 is a dummy entry

align := 8
	for size := align; size <= maxSmallSize; size += align {
		if powerOfTwo(size) { // bump alignment once in a while
			if size >= 2048 {
				align = 256
			} else if size >= 128 {
				align = size / 8
			} else if size >= 32 {
				align = 16 // heap bitmaps assume 16 byte alignment for allocations >= 32 bytes.
			}
		}
		if !powerOfTwo(align) {
			panic("incorrect alignment")
		}

// Make the allocnpages big enough that
		// the leftover is less than 1/8 of the total,
		// so wasted space is at most 12.5%.
		allocsize := pageSize
		for allocsize%size > allocsize/8 {
			allocsize += pageSize
		}
		npages := allocsize / pageSize

// If the previous sizeclass chose the same
		// allocation size and fit the same number of
		// objects into the page, we might as well
		// use just this size instead of having two
		// different sizes.
		if len(classes) > 1 && npages == classes[len(classes)-1].npages && allocsize/size == allocsize/classes[len(classes)-1].size {
			classes[len(classes)-1].size = size
			continue
		}
		classes = append(classes, class{size: size, npages: npages})
	}

// Increase object sizes if we can fit the same number of larger objects
	// into the same number of pages. For example, we choose size 8448 above
	// with 6 objects in 7 pages. But we can well use object size 9472,
	// which is also 6 objects in 7 pages but +1024 bytes (+12.12%).
	// We need to preserve at least largeSizeDiv alignment otherwise
	// sizeToClass won't work.
	for i := range classes {
		if i == 0 {
			continue
		}
		c := &classes[i]
		psize := c.npages * pageSize
		new_size := (psize / (psize / c.size)) &^ (largeSizeDiv - 1)
		if new_size > c.size {
			c.size = new_size
		}
	}

if len(classes) != 68 {
		panic("number of size classes has changed")
	}

for i := range classes {
		computeDivMagic(&classes[i])
	}

return classes
}

// computeDivMagic checks that the division required to compute object
// index from span offset can be computed using 32-bit multiplication.
// n / c.size is implemented as (n * (^uint32(0)/uint32(c.size) + 1)) >> 32
// for all 0 <= n <= c.npages * pageSize
func computeDivMagic(c *class) {
	// divisor
	d := c.size
	if d == 0 {
		return
	}

// maximum input value for which the formula needs to work.
	max := c.npages * pageSize

// As reported in [1], if n and d are unsigned N-bit integers, we
	// can compute n / d as ⌊n * c / 2^F⌋, where c is ⌈2^F / d⌉ and F is
	// computed with:
	//
	// 	Algorithm 2: Algorithm to select the number of fractional bits
	// 	and the scaled approximate reciprocal in the case of unsigned
	// 	integers.
	//
	// 	if d is a power of two then
	// 		Let F ← log₂(d) and c = 1.
	// 	else
	// 		Let F ← N + L where L is the smallest integer
	// 		such that d ≤ (2^(N+L) mod d) + 2^L.
	// 	end if
	//
	// [1] "Faster Remainder by Direct Computation: Applications to
	// Compilers and Software Libraries" Daniel Lemire, Owen Kaser,
	// Nathan Kurz arXiv:1902.01961
	//
	// To minimize the risk of introducing errors, we implement the
	// algorithm exactly as stated, rather than trying to adapt it to
	// fit typical Go idioms.
	N := bits.Len(uint(max))
	var F int
	if powerOfTwo(d) {
		F = int(math.Log2(float64(d)))
		if d != 1<<F {
			panic("imprecise log2")
		}
	} else {
		for L := 0; ; L++ {
			if d <= ((1<<(N+L))%d)+(1<<L) {
				F = N + L
				break
			}
		}
	}

// Also, noted in the paper, F is the smallest number of fractional
	// bits required. We use 32 bits, because it works for all size
	// classes and is fast on all CPU architectures that we support.
	if F > 32 {
		fmt.Printf("d=%d max=%d N=%d F=%d\n", c.size, max, N, F)
		panic("size class requires more than 32 bits of precision")
	}

// Brute force double-check with the exact computation that will be
	// done by the runtime.
	m := ^uint32(0)/uint32(c.size) + 1
	for n := 0; n <= max; n++ {
		if uint32((uint64(n)*uint64(m))>>32) != uint32(n/c.size) {
			fmt.Printf("d=%d max=%d m=%d n=%d\n", d, max, m, n)
			panic("bad 32-bit multiply magic")
		}
	}
}

func printComment(w io.Writer, classes []class) {
	fmt.Fprintf(w, "// %-5s  %-9s  %-10s  %-7s  %-10s  %-9s  %-9s\n", "class", "bytes/obj", "bytes/span", "objects", "tail waste", "max waste", "min align")
	prevSize := 0
	var minAligns [pageShift + 1]int
	for i, c := range classes {
		if i == 0 {
			continue
		}
		spanSize := c.npages * pageSize
		objects := spanSize / c.size
		tailWaste := spanSize - c.size*(spanSize/c.size)
		maxWaste := float64((c.size-prevSize-1)*objects+tailWaste) / float64(spanSize)
		alignBits := bits.TrailingZeros(uint(c.size))
		if alignBits > pageShift {
			// object alignment is capped at page alignment
			alignBits = pageShift
		}
		for i := range minAligns {
			if i > alignBits {
				minAligns[i] = 0
			} else if minAligns[i] == 0 {
				minAligns[i] = c.size
			}
		}
		prevSize = c.size
		fmt.Fprintf(w, "// %5d  %9d  %10d  %7d  %10d  %8.2f%%  %9d\n", i, c.size, spanSize, objects, tailWaste, 100*maxWaste, 1<<alignBits)
	}
	fmt.Fprintf(w, "\n")

fmt.Fprintf(w, "// %-9s  %-4s  %-12s\n", "alignment", "bits", "min obj size")
	for bits, size := range minAligns {
		if size == 0 {
			break
		}
		if bits+1 < len(minAligns) && size == minAligns[bits+1] {
			continue
		}
		fmt.Fprintf(w, "// %9d  %4d  %12d\n", 1<<bits, bits, size)
	}
	fmt.Fprintf(w, "\n")
}

func printClasses(w io.Writer, classes []class) {
	fmt.Fprintln(w, "const (")
	fmt.Fprintf(w, "_MaxSmallSize = %d\n", maxSmallSize)
	fmt.Fprintf(w, "smallSizeDiv = %d\n", smallSizeDiv)
	fmt.Fprintf(w, "smallSizeMax = %d\n", smallSizeMax)
	fmt.Fprintf(w, "largeSizeDiv = %d\n", largeSizeDiv)
	fmt.Fprintf(w, "_NumSizeClasses = %d\n", len(classes))
	fmt.Fprintf(w, "_PageShift = %d\n", pageShift)
	fmt.Fprintln(w, ")")

fmt.Fprint(w, "var class_to_size = [_NumSizeClasses]uint16 {")
	for _, c := range classes {
		fmt.Fprintf(w, "%d,", c.size)
	}
	fmt.Fprintln(w, "}")

fmt.Fprint(w, "var class_to_allocnpages = [_NumSizeClasses]uint8 {")
	for _, c := range classes {
		fmt.Fprintf(w, "%d,", c.npages)
	}
	fmt.Fprintln(w, "}")

fmt.Fprint(w, "var class_to_divmagic = [_NumSizeClasses]uint32 {")
	for _, c := range classes {
		if c.size == 0 {
			fmt.Fprintf(w, "0,")
			continue
		}
		fmt.Fprintf(w, "^uint32(0)/%d+1,", c.size)
	}
	fmt.Fprintln(w, "}")

// map from size to size class, for small sizes.
	sc := make([]int, smallSizeMax/smallSizeDiv+1)
	for i := range sc {
		size := i * smallSizeDiv
		for j, c := range classes {
			if c.size >= size {
				sc[i] = j
				break
			}
		}
	}
	fmt.Fprint(w, "var size_to_class8 = [smallSizeMax/smallSizeDiv+1]uint8 {")
	for _, v := range sc {
		fmt.Fprintf(w, "%d,", v)
	}
	fmt.Fprintln(w, "}")

// map from size to size class, for large sizes.
	sc = make([]int, (maxSmallSize-smallSizeMax)/largeSizeDiv+1)
	for i := range sc {
		size := smallSizeMax + i*largeSizeDiv
		for j, c := range classes {
			if c.size >= size {
				sc[i] = j
				break
			}
		}
	}
	fmt.Fprint(w, "var size_to_class128 = [(_MaxSmallSize-smallSizeMax)/largeSizeDiv+1]uint8 {")
	for _, v := range sc {
		fmt.Fprintf(w, "%d,", v)
	}
	fmt.Fprintln(w, "}")
}

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