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golang
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1.17.2
/
src
/
runtime
/
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..
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HACKING.md
(13.07 KB)
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Makefile
(178 B)
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abi_test.go
(2.88 KB)
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alg.go
(9.45 KB)
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asm.s
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asm_386.s
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asm_amd64.s
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asm_arm.s
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asm_arm64.s
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asm_mips64x.s
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asm_mipsx.s
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asm_ppc64x.h
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asm_ppc64x.s
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asm_riscv64.s
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asm_s390x.s
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asm_wasm.s
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atomic_arm64.s
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atomic_mips64x.s
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atomic_mipsx.s
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atomic_pointer.go
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atomic_ppc64x.s
(461 B)
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atomic_riscv64.s
(275 B)
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auxv_none.go
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callers_test.go
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cgo
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cgo.go
(2.01 KB)
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cgo_mmap.go
(2.42 KB)
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cgo_ppc64x.go
(439 B)
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cgo_sigaction.go
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cgocall.go
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cgocallback.go
(317 B)
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cgocheck.go
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chan.go
(23.54 KB)
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chan_test.go
(23.01 KB)
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chanbarrier_test.go
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checkptr.go
(3.29 KB)
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checkptr_test.go
(1.62 KB)
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closure_test.go
(937 B)
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compiler.go
(413 B)
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complex.go
(1.59 KB)
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complex_test.go
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conv_wasm_test.go
(2.96 KB)
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cpuflags.go
(800 B)
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cpuflags_amd64.go
(533 B)
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cpuflags_arm64.go
(334 B)
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cpuprof.go
(6.92 KB)
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cputicks.go
(497 B)
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crash_cgo_test.go
(16.17 KB)
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crash_nonunix_test.go
(429 B)
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crash_test.go
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crash_unix_test.go
(8.52 KB)
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debug
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debug.go
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debug_test.go
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debugcall.go
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debuglog.go
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debuglog_off.go
(377 B)
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debuglog_on.go
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debuglog_test.go
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defer_test.go
(10.32 KB)
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defs1_linux.go
(862 B)
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defs1_netbsd_386.go
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defs1_netbsd_amd64.go
(3.07 KB)
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defs1_netbsd_arm.go
(2.96 KB)
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defs1_netbsd_arm64.go
(3.18 KB)
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defs1_solaris_amd64.go
(4.02 KB)
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defs2_linux.go
(3.52 KB)
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defs3_linux.go
(1.11 KB)
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defs_aix.go
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defs_aix_ppc64.go
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defs_arm_linux.go
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defs_darwin.go
(3.79 KB)
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defs_darwin_amd64.go
(6.07 KB)
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defs_darwin_arm64.go
(3.89 KB)
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defs_dragonfly.go
(2.63 KB)
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defs_dragonfly_amd64.go
(3.31 KB)
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defs_freebsd.go
(3.86 KB)
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defs_freebsd_386.go
(4.38 KB)
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defs_freebsd_amd64.go
(4.65 KB)
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defs_freebsd_arm.go
(3.71 KB)
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defs_freebsd_arm64.go
(4.03 KB)
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defs_illumos_amd64.go
(285 B)
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defs_linux.go
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defs_linux_386.go
(3.77 KB)
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defs_linux_amd64.go
(4.28 KB)
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defs_linux_arm.go
(3.45 KB)
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defs_linux_arm64.go
(3.21 KB)
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defs_linux_mips64x.go
(3.24 KB)
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defs_linux_mipsx.go
(3.21 KB)
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defs_linux_ppc64.go
(3.28 KB)
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defs_linux_ppc64le.go
(3.28 KB)
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defs_linux_riscv64.go
(3.27 KB)
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defs_linux_s390x.go
(2.76 KB)
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defs_netbsd.go
(2.76 KB)
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defs_netbsd_386.go
(872 B)
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defs_netbsd_amd64.go
(1.03 KB)
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defs_netbsd_arm.go
(781 B)
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defs_openbsd.go
(3.1 KB)
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defs_openbsd_386.go
(2.89 KB)
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defs_openbsd_amd64.go
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defs_openbsd_arm.go
(3 KB)
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defs_openbsd_arm64.go
(2.76 KB)
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defs_openbsd_mips64.go
(2.66 KB)
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defs_plan9_386.go
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defs_plan9_amd64.go
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defs_plan9_arm.go
(1.73 KB)
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defs_solaris.go
(3.35 KB)
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defs_solaris_amd64.go
(1021 B)
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defs_windows.go
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defs_windows_386.go
(1.98 KB)
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defs_windows_amd64.go
(2.71 KB)
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defs_windows_arm.go
(2.11 KB)
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defs_windows_arm64.go
(2.63 KB)
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duff_386.s
(8.24 KB)
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duff_amd64.s
(5.62 KB)
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duff_arm.s
(7.11 KB)
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duff_arm64.s
(5.25 KB)
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duff_mips64x.s
(11.31 KB)
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duff_ppc64x.s
(2.43 KB)
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duff_riscv64.s
(11.38 KB)
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duff_s390x.s
(507 B)
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env_plan9.go
(2.99 KB)
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env_posix.go
(1.95 KB)
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env_test.go
(1.16 KB)
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error.go
(9.23 KB)
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example_test.go
(1.55 KB)
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export_aix_test.go
(204 B)
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export_arm_test.go
(226 B)
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export_darwin_test.go
(351 B)
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export_debug_regabiargs_off_test.go
(416 B)
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export_debug_regabiargs_on_test.go
(1.39 KB)
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export_debug_test.go
(5.86 KB)
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export_debuglog_test.go
(1.27 KB)
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export_futex_test.go
(570 B)
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export_linux_test.go
(429 B)
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export_mmap_test.go
(571 B)
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export_pipe2_test.go
(436 B)
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export_pipe_test.go
(240 B)
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export_solaris_test.go
(282 B)
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export_test.go
(30.12 KB)
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export_unix_test.go
(2.35 KB)
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export_windows_test.go
(652 B)
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extern.go
(12.58 KB)
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fastlog2.go
(1.22 KB)
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fastlog2_test.go
(784 B)
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fastlog2table.go
(904 B)
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float.go
(1.35 KB)
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funcdata.h
(2.47 KB)
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futex_test.go
(2.15 KB)
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gc_test.go
(19.21 KB)
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gcinfo_test.go
(5.69 KB)
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go_tls.h
(366 B)
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hash32.go
(1.61 KB)
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hash64.go
(2.01 KB)
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hash_test.go
(16.5 KB)
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heapdump.go
(17.74 KB)
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histogram.go
(6.42 KB)
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histogram_test.go
(1.85 KB)
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iface.go
(16.13 KB)
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iface_test.go
(7.51 KB)
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internal
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lfstack.go
(1.77 KB)
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lfstack_32bit.go
(562 B)
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lfstack_64bit.go
(2.24 KB)
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lfstack_test.go
(2.78 KB)
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libfuzzer.go
(2.6 KB)
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libfuzzer_amd64.s
(961 B)
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libfuzzer_arm64.s
(772 B)
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lock_futex.go
(5.22 KB)
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lock_js.go
(5.81 KB)
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lock_sema.go
(6.8 KB)
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lockrank.go
(11.62 KB)
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lockrank_off.go
(1.17 KB)
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lockrank_on.go
(9.84 KB)
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lockrank_test.go
(1.15 KB)
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malloc.go
(52.33 KB)
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malloc_test.go
(10.83 KB)
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map.go
(42.47 KB)
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map_benchmark_test.go
(10.51 KB)
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map_fast32.go
(12.63 KB)
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map_fast64.go
(12.82 KB)
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map_faststr.go
(14.15 KB)
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map_test.go
(27.52 KB)
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mbarrier.go
(12.2 KB)
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mbitmap.go
(65.27 KB)
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mcache.go
(9.68 KB)
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mcentral.go
(7.8 KB)
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mcheckmark.go
(2.81 KB)
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mem_aix.go
(1.94 KB)
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mem_bsd.go
(2.12 KB)
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mem_darwin.go
(1.88 KB)
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mem_js.go
(2.35 KB)
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mem_linux.go
(5.59 KB)
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mem_plan9.go
(4.53 KB)
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mem_windows.go
(3.87 KB)
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memclr_386.s
(2.42 KB)
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memclr_amd64.s
(3.89 KB)
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memclr_arm.s
(2.6 KB)
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memclr_arm64.s
(3.65 KB)
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memclr_mips64x.s
(1.75 KB)
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memclr_mipsx.s
(1.35 KB)
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memclr_plan9_386.s
(983 B)
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memclr_plan9_amd64.s
(511 B)
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memclr_ppc64x.s
(4.31 KB)
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memclr_riscv64.s
(926 B)
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memclr_s390x.s
(1.96 KB)
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memclr_wasm.s
(622 B)
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memmove_386.s
(4.46 KB)
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memmove_amd64.s
(12.66 KB)
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memmove_arm.s
(5.9 KB)
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memmove_arm64.s
(6 KB)
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memmove_linux_amd64_test.go
(1.6 KB)
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memmove_mips64x.s
(1.85 KB)
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memmove_mipsx.s
(4.42 KB)
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memmove_plan9_386.s
(3.06 KB)
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memmove_plan9_amd64.s
(3.04 KB)
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memmove_ppc64x.s
(4.11 KB)
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memmove_riscv64.s
(1.81 KB)
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memmove_s390x.s
(2.92 KB)
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memmove_test.go
(12.04 KB)
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memmove_wasm.s
(1.74 KB)
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metrics
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metrics.go
(17.69 KB)
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metrics_test.go
(12.48 KB)
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mfinal.go
(15.76 KB)
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mfinal_test.go
(5.85 KB)
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mfixalloc.go
(2.73 KB)
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mgc.go
(55.18 KB)
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mgcmark.go
(45.54 KB)
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mgcpacer.go
(29.56 KB)
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mgcscavenge.go
(35.05 KB)
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mgcscavenge_test.go
(12.74 KB)
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mgcstack.go
(10.58 KB)
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mgcsweep.go
(23.56 KB)
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mgcwork.go
(12.82 KB)
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mheap.go
(66.31 KB)
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mkduff.go
(7.19 KB)
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mkfastlog2table.go
(1.32 KB)
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mkpreempt.go
(14.17 KB)
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mksizeclasses.go
(9.31 KB)
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mmap.go
(990 B)
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mpagealloc.go
(36.77 KB)
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mpagealloc_32bit.go
(3.81 KB)
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mpagealloc_64bit.go
(6.65 KB)
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mpagealloc_test.go
(32.38 KB)
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mpagecache.go
(5.28 KB)
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mpagecache_test.go
(9.93 KB)
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mpallocbits.go
(12.01 KB)
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mpallocbits_test.go
(13.69 KB)
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mprof.go
(25.82 KB)
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mranges.go
(11.84 KB)
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mranges_test.go
(5.68 KB)
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msan
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msan.go
(1.51 KB)
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msan0.go
(741 B)
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msan_amd64.s
(2.32 KB)
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msan_arm64.s
(2.01 KB)
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msize.go
(777 B)
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mspanset.go
(12.2 KB)
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mstats.go
(30.65 KB)
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mwbbuf.go
(9.3 KB)
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nbpipe_fcntl_libc_test.go
(499 B)
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nbpipe_fcntl_unix_test.go
(507 B)
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nbpipe_pipe.go
(426 B)
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nbpipe_pipe2.go
(592 B)
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nbpipe_test.go
(2.26 KB)
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net_plan9.go
(645 B)
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netpoll.go
(16.24 KB)
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netpoll_aix.go
(4.87 KB)
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netpoll_epoll.go
(4.21 KB)
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netpoll_fake.go
(670 B)
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netpoll_kqueue.go
(4.64 KB)
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netpoll_os_test.go
(360 B)
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netpoll_solaris.go
(10.75 KB)
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netpoll_stub.go
(1.42 KB)
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netpoll_windows.go
(3.75 KB)
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norace_linux_test.go
(905 B)
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norace_test.go
(996 B)
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numcpu_freebsd_test.go
(381 B)
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os2_aix.go
(20.45 KB)
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os2_freebsd.go
(302 B)
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os2_openbsd.go
(296 B)
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os2_plan9.go
(1.48 KB)
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os2_solaris.go
(320 B)
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os3_plan9.go
(3.88 KB)
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os3_solaris.go
(17.02 KB)
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os_aix.go
(8.06 KB)
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os_android.go
(463 B)
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os_darwin.go
(11.54 KB)
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os_darwin_arm64.go
(416 B)
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os_dragonfly.go
(6.46 KB)
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os_freebsd.go
(11.2 KB)
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os_freebsd2.go
(507 B)
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os_freebsd_amd64.go
(529 B)
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os_freebsd_arm.go
(1.32 KB)
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os_freebsd_arm64.go
(398 B)
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os_freebsd_noauxv.go
(264 B)
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os_illumos.go
(3.93 KB)
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os_js.go
(3.26 KB)
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os_linux.go
(13.47 KB)
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os_linux_arm.go
(1.35 KB)
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os_linux_arm64.go
(572 B)
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os_linux_be64.go
(862 B)
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os_linux_generic.go
(950 B)
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os_linux_mips64x.go
(1.11 KB)
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os_linux_mipsx.go
(1.09 KB)
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os_linux_noauxv.go
(408 B)
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os_linux_novdso.go
(387 B)
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os_linux_ppc64x.go
(566 B)
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os_linux_riscv64.go
(198 B)
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os_linux_s390x.go
(316 B)
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os_linux_x86.go
(270 B)
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os_netbsd.go
(9.09 KB)
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os_netbsd_386.go
(588 B)
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os_netbsd_amd64.go
(585 B)
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os_netbsd_arm.go
(1.13 KB)
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os_netbsd_arm64.go
(827 B)
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os_nonopenbsd.go
(456 B)
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os_only_solaris.go
(376 B)
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os_openbsd.go
(6.01 KB)
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os_openbsd_arm.go
(749 B)
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os_openbsd_arm64.go
(416 B)
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os_openbsd_libc.go
(1.7 KB)
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os_openbsd_mips64.go
(416 B)
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os_openbsd_syscall.go
(1.27 KB)
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os_openbsd_syscall1.go
(466 B)
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os_openbsd_syscall2.go
(2.5 KB)
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os_plan9.go
(10.2 KB)
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os_plan9_arm.go
(462 B)
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os_solaris.go
(6.49 KB)
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os_windows.go
(43.68 KB)
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os_windows_arm.go
(511 B)
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os_windows_arm64.go
(339 B)
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panic.go
(44.28 KB)
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panic32.go
(4.83 KB)
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panic_test.go
(1.71 KB)
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plugin.go
(4.27 KB)
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pprof
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preempt.go
(15.4 KB)
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preempt_386.s
(1.07 KB)
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preempt_amd64.s
(1.81 KB)
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preempt_arm.s
(1.66 KB)
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preempt_arm64.s
(2.99 KB)
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preempt_mips64x.s
(2.93 KB)
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preempt_mipsx.s
(2.89 KB)
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preempt_nonwindows.go
(309 B)
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preempt_ppc64x.s
(2.92 KB)
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preempt_riscv64.s
(2.48 KB)
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preempt_s390x.s
(1.19 KB)
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preempt_wasm.s
(365 B)
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print.go
(5.95 KB)
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proc.go
(181.46 KB)
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proc_runtime_test.go
(820 B)
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proc_test.go
(25.02 KB)
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profbuf.go
(18.26 KB)
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profbuf_test.go
(8.65 KB)
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proflabel.go
(1.52 KB)
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race
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race.go
(18.56 KB)
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race0.go
(2.81 KB)
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race_amd64.s
(14.46 KB)
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race_arm64.s
(13.71 KB)
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race_ppc64le.s
(17.72 KB)
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rand_test.go
(783 B)
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rdebug.go
(553 B)
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relax_stub.go
(617 B)
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rt0_aix_ppc64.s
(4.33 KB)
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rt0_android_386.s
(822 B)
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rt0_android_amd64.s
(754 B)
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rt0_android_arm.s
(843 B)
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rt0_android_arm64.s
(941 B)
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rt0_darwin_amd64.s
(399 B)
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rt0_darwin_arm64.s
(2.27 KB)
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rt0_dragonfly_amd64.s
(448 B)
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rt0_freebsd_386.s
(454 B)
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rt0_freebsd_amd64.s
(442 B)
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rt0_freebsd_arm.s
(298 B)
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rt0_freebsd_arm64.s
(2.46 KB)
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rt0_illumos_amd64.s
(311 B)
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rt0_ios_amd64.s
(425 B)
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rt0_ios_arm64.s
(425 B)
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rt0_js_wasm.s
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Editing: iface.go
// Copyright 2014 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. package runtime import ( "runtime/internal/atomic" "runtime/internal/sys" "unsafe" ) const itabInitSize = 512 var ( itabLock mutex // lock for accessing itab table itabTable = &itabTableInit // pointer to current table itabTableInit = itabTableType{size: itabInitSize} // starter table ) // Note: change the formula in the mallocgc call in itabAdd if you change these fields. type itabTableType struct { size uintptr // length of entries array. Always a power of 2. count uintptr // current number of filled entries. entries [itabInitSize]*itab // really [size] large } func itabHashFunc(inter *interfacetype, typ *_type) uintptr { // compiler has provided some good hash codes for us. return uintptr(inter.typ.hash ^ typ.hash) } func getitab(inter *interfacetype, typ *_type, canfail bool) *itab { if len(inter.mhdr) == 0 { throw("internal error - misuse of itab") } // easy case if typ.tflag&tflagUncommon == 0 { if canfail { return nil } name := inter.typ.nameOff(inter.mhdr[0].name) panic(&TypeAssertionError{nil, typ, &inter.typ, name.name()}) } var m *itab // First, look in the existing table to see if we can find the itab we need. // This is by far the most common case, so do it without locks. // Use atomic to ensure we see any previous writes done by the thread // that updates the itabTable field (with atomic.Storep in itabAdd). t := (*itabTableType)(atomic.Loadp(unsafe.Pointer(&itabTable))) if m = t.find(inter, typ); m != nil { goto finish } // Not found. Grab the lock and try again. lock(&itabLock) if m = itabTable.find(inter, typ); m != nil { unlock(&itabLock) goto finish } // Entry doesn't exist yet. Make a new entry & add it. m = (*itab)(persistentalloc(unsafe.Sizeof(itab{})+uintptr(len(inter.mhdr)-1)*sys.PtrSize, 0, &memstats.other_sys)) m.inter = inter m._type = typ // The hash is used in type switches. However, compiler statically generates itab's // for all interface/type pairs used in switches (which are added to itabTable // in itabsinit). The dynamically-generated itab's never participate in type switches, // and thus the hash is irrelevant. // Note: m.hash is _not_ the hash used for the runtime itabTable hash table. m.hash = 0 m.init() itabAdd(m) unlock(&itabLock) finish: if m.fun[0] != 0 { return m } if canfail { return nil } // this can only happen if the conversion // was already done once using the , ok form // and we have a cached negative result. // The cached result doesn't record which // interface function was missing, so initialize // the itab again to get the missing function name. panic(&TypeAssertionError{concrete: typ, asserted: &inter.typ, missingMethod: m.init()}) } // find finds the given interface/type pair in t. // Returns nil if the given interface/type pair isn't present. func (t *itabTableType) find(inter *interfacetype, typ *_type) *itab { // Implemented using quadratic probing. // Probe sequence is h(i) = h0 + i*(i+1)/2 mod 2^k. // We're guaranteed to hit all table entries using this probe sequence. mask := t.size - 1 h := itabHashFunc(inter, typ) & mask for i := uintptr(1); ; i++ { p := (**itab)(add(unsafe.Pointer(&t.entries), h*sys.PtrSize)) // Use atomic read here so if we see m != nil, we also see // the initializations of the fields of m. // m := *p m := (*itab)(atomic.Loadp(unsafe.Pointer(p))) if m == nil { return nil } if m.inter == inter && m._type == typ { return m } h += i h &= mask } } // itabAdd adds the given itab to the itab hash table. // itabLock must be held. func itabAdd(m *itab) { // Bugs can lead to calling this while mallocing is set, // typically because this is called while panicing. // Crash reliably, rather than only when we need to grow // the hash table. if getg().m.mallocing != 0 { throw("malloc deadlock") } t := itabTable if t.count >= 3*(t.size/4) { // 75% load factor // Grow hash table. // t2 = new(itabTableType) + some additional entries // We lie and tell malloc we want pointer-free memory because // all the pointed-to values are not in the heap. t2 := (*itabTableType)(mallocgc((2+2*t.size)*sys.PtrSize, nil, true)) t2.size = t.size * 2 // Copy over entries. // Note: while copying, other threads may look for an itab and // fail to find it. That's ok, they will then try to get the itab lock // and as a consequence wait until this copying is complete. iterate_itabs(t2.add) if t2.count != t.count { throw("mismatched count during itab table copy") } // Publish new hash table. Use an atomic write: see comment in getitab. atomicstorep(unsafe.Pointer(&itabTable), unsafe.Pointer(t2)) // Adopt the new table as our own. t = itabTable // Note: the old table can be GC'ed here. } t.add(m) } // add adds the given itab to itab table t. // itabLock must be held. func (t *itabTableType) add(m *itab) { // See comment in find about the probe sequence. // Insert new itab in the first empty spot in the probe sequence. mask := t.size - 1 h := itabHashFunc(m.inter, m._type) & mask for i := uintptr(1); ; i++ { p := (**itab)(add(unsafe.Pointer(&t.entries), h*sys.PtrSize)) m2 := *p if m2 == m { // A given itab may be used in more than one module // and thanks to the way global symbol resolution works, the // pointed-to itab may already have been inserted into the // global 'hash'. return } if m2 == nil { // Use atomic write here so if a reader sees m, it also // sees the correctly initialized fields of m. // NoWB is ok because m is not in heap memory. // *p = m atomic.StorepNoWB(unsafe.Pointer(p), unsafe.Pointer(m)) t.count++ return } h += i h &= mask } } // init fills in the m.fun array with all the code pointers for // the m.inter/m._type pair. If the type does not implement the interface, // it sets m.fun[0] to 0 and returns the name of an interface function that is missing. // It is ok to call this multiple times on the same m, even concurrently. func (m *itab) init() string { inter := m.inter typ := m._type x := typ.uncommon() // both inter and typ have method sorted by name, // and interface names are unique, // so can iterate over both in lock step; // the loop is O(ni+nt) not O(ni*nt). ni := len(inter.mhdr) nt := int(x.mcount) xmhdr := (*[1 << 16]method)(add(unsafe.Pointer(x), uintptr(x.moff)))[:nt:nt] j := 0 methods := (*[1 << 16]unsafe.Pointer)(unsafe.Pointer(&m.fun[0]))[:ni:ni] var fun0 unsafe.Pointer imethods: for k := 0; k < ni; k++ { i := &inter.mhdr[k] itype := inter.typ.typeOff(i.ityp) name := inter.typ.nameOff(i.name) iname := name.name() ipkg := name.pkgPath() if ipkg == "" { ipkg = inter.pkgpath.name() } for ; j < nt; j++ { t := &xmhdr[j] tname := typ.nameOff(t.name) if typ.typeOff(t.mtyp) == itype && tname.name() == iname { pkgPath := tname.pkgPath() if pkgPath == "" { pkgPath = typ.nameOff(x.pkgpath).name() } if tname.isExported() || pkgPath == ipkg { if m != nil { ifn := typ.textOff(t.ifn) if k == 0 { fun0 = ifn // we'll set m.fun[0] at the end } else { methods[k] = ifn } } continue imethods } } } // didn't find method m.fun[0] = 0 return iname } m.fun[0] = uintptr(fun0) return "" } func itabsinit() { lockInit(&itabLock, lockRankItab) lock(&itabLock) for _, md := range activeModules() { for _, i := range md.itablinks { itabAdd(i) } } unlock(&itabLock) } // panicdottypeE is called when doing an e.(T) conversion and the conversion fails. // have = the dynamic type we have. // want = the static type we're trying to convert to. // iface = the static type we're converting from. func panicdottypeE(have, want, iface *_type) { panic(&TypeAssertionError{iface, have, want, ""}) } // panicdottypeI is called when doing an i.(T) conversion and the conversion fails. // Same args as panicdottypeE, but "have" is the dynamic itab we have. func panicdottypeI(have *itab, want, iface *_type) { var t *_type if have != nil { t = have._type } panicdottypeE(t, want, iface) } // panicnildottype is called when doing a i.(T) conversion and the interface i is nil. // want = the static type we're trying to convert to. func panicnildottype(want *_type) { panic(&TypeAssertionError{nil, nil, want, ""}) // TODO: Add the static type we're converting from as well. // It might generate a better error message. // Just to match other nil conversion errors, we don't for now. } // The specialized convTx routines need a type descriptor to use when calling mallocgc. // We don't need the type to be exact, just to have the correct size, alignment, and pointer-ness. // However, when debugging, it'd be nice to have some indication in mallocgc where the types came from, // so we use named types here. // We then construct interface values of these types, // and then extract the type word to use as needed. type ( uint16InterfacePtr uint16 uint32InterfacePtr uint32 uint64InterfacePtr uint64 stringInterfacePtr string sliceInterfacePtr []byte ) var ( uint16Eface interface{} = uint16InterfacePtr(0) uint32Eface interface{} = uint32InterfacePtr(0) uint64Eface interface{} = uint64InterfacePtr(0) stringEface interface{} = stringInterfacePtr("") sliceEface interface{} = sliceInterfacePtr(nil) uint16Type *_type = efaceOf(&uint16Eface)._type uint32Type *_type = efaceOf(&uint32Eface)._type uint64Type *_type = efaceOf(&uint64Eface)._type stringType *_type = efaceOf(&stringEface)._type sliceType *_type = efaceOf(&sliceEface)._type ) // The conv and assert functions below do very similar things. // The convXXX functions are guaranteed by the compiler to succeed. // The assertXXX functions may fail (either panicking or returning false, // depending on whether they are 1-result or 2-result). // The convXXX functions succeed on a nil input, whereas the assertXXX // functions fail on a nil input. func convT2E(t *_type, elem unsafe.Pointer) (e eface) { if raceenabled { raceReadObjectPC(t, elem, getcallerpc(), funcPC(convT2E)) } if msanenabled { msanread(elem, t.size) } x := mallocgc(t.size, t, true) // TODO: We allocate a zeroed object only to overwrite it with actual data. // Figure out how to avoid zeroing. Also below in convT2Eslice, convT2I, convT2Islice. typedmemmove(t, x, elem) e._type = t e.data = x return } func convT16(val uint16) (x unsafe.Pointer) { if val < uint16(len(staticuint64s)) { x = unsafe.Pointer(&staticuint64s[val]) if sys.BigEndian { x = add(x, 6) } } else { x = mallocgc(2, uint16Type, false) *(*uint16)(x) = val } return } func convT32(val uint32) (x unsafe.Pointer) { if val < uint32(len(staticuint64s)) { x = unsafe.Pointer(&staticuint64s[val]) if sys.BigEndian { x = add(x, 4) } } else { x = mallocgc(4, uint32Type, false) *(*uint32)(x) = val } return } func convT64(val uint64) (x unsafe.Pointer) { if val < uint64(len(staticuint64s)) { x = unsafe.Pointer(&staticuint64s[val]) } else { x = mallocgc(8, uint64Type, false) *(*uint64)(x) = val } return } func convTstring(val string) (x unsafe.Pointer) { if val == "" { x = unsafe.Pointer(&zeroVal[0]) } else { x = mallocgc(unsafe.Sizeof(val), stringType, true) *(*string)(x) = val } return } func convTslice(val []byte) (x unsafe.Pointer) { // Note: this must work for any element type, not just byte. if (*slice)(unsafe.Pointer(&val)).array == nil { x = unsafe.Pointer(&zeroVal[0]) } else { x = mallocgc(unsafe.Sizeof(val), sliceType, true) *(*[]byte)(x) = val } return } func convT2Enoptr(t *_type, elem unsafe.Pointer) (e eface) { if raceenabled { raceReadObjectPC(t, elem, getcallerpc(), funcPC(convT2Enoptr)) } if msanenabled { msanread(elem, t.size) } x := mallocgc(t.size, t, false) memmove(x, elem, t.size) e._type = t e.data = x return } func convT2I(tab *itab, elem unsafe.Pointer) (i iface) { t := tab._type if raceenabled { raceReadObjectPC(t, elem, getcallerpc(), funcPC(convT2I)) } if msanenabled { msanread(elem, t.size) } x := mallocgc(t.size, t, true) typedmemmove(t, x, elem) i.tab = tab i.data = x return } func convT2Inoptr(tab *itab, elem unsafe.Pointer) (i iface) { t := tab._type if raceenabled { raceReadObjectPC(t, elem, getcallerpc(), funcPC(convT2Inoptr)) } if msanenabled { msanread(elem, t.size) } x := mallocgc(t.size, t, false) memmove(x, elem, t.size) i.tab = tab i.data = x return } func convI2I(inter *interfacetype, i iface) (r iface) { tab := i.tab if tab == nil { return } if tab.inter == inter { r.tab = tab r.data = i.data return } r.tab = getitab(inter, tab._type, false) r.data = i.data return } func assertI2I(inter *interfacetype, tab *itab) *itab { if tab == nil { // explicit conversions require non-nil interface value. panic(&TypeAssertionError{nil, nil, &inter.typ, ""}) } if tab.inter == inter { return tab } return getitab(inter, tab._type, false) } func assertI2I2(inter *interfacetype, i iface) (r iface) { tab := i.tab if tab == nil { return } if tab.inter != inter { tab = getitab(inter, tab._type, true) if tab == nil { return } } r.tab = tab r.data = i.data return } func assertE2I(inter *interfacetype, t *_type) *itab { if t == nil { // explicit conversions require non-nil interface value. panic(&TypeAssertionError{nil, nil, &inter.typ, ""}) } return getitab(inter, t, false) } func assertE2I2(inter *interfacetype, e eface) (r iface) { t := e._type if t == nil { return } tab := getitab(inter, t, true) if tab == nil { return } r.tab = tab r.data = e.data return } //go:linkname reflect_ifaceE2I reflect.ifaceE2I func reflect_ifaceE2I(inter *interfacetype, e eface, dst *iface) { *dst = iface{assertE2I(inter, e._type), e.data} } //go:linkname reflectlite_ifaceE2I internal/reflectlite.ifaceE2I func reflectlite_ifaceE2I(inter *interfacetype, e eface, dst *iface) { *dst = iface{assertE2I(inter, e._type), e.data} } func iterate_itabs(fn func(*itab)) { // Note: only runs during stop the world or with itabLock held, // so no other locks/atomics needed. t := itabTable for i := uintptr(0); i < t.size; i++ { m := *(**itab)(add(unsafe.Pointer(&t.entries), i*sys.PtrSize)) if m != nil { fn(m) } } } // staticuint64s is used to avoid allocating in convTx for small integer values. var staticuint64s = [...]uint64{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, } // The linker redirects a reference of a method that it determined // unreachable to a reference to this function, so it will throw if // ever called. func unreachableMethod() { throw("unreachable method called. linker bug?") }
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