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golang
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src
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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
(715 B)
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asm_386.s
(40.27 KB)
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asm_amd64.s
(56.93 KB)
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asm_arm.s
(30.23 KB)
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asm_arm64.s
(33 KB)
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asm_mips64x.s
(22.43 KB)
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asm_mipsx.s
(24.39 KB)
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asm_ppc64x.h
(1023 B)
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asm_ppc64x.s
(29.16 KB)
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asm_riscv64.s
(22.43 KB)
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asm_s390x.s
(26.04 KB)
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asm_wasm.s
(9.8 KB)
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atomic_arm64.s
(259 B)
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atomic_mips64x.s
(326 B)
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atomic_mipsx.s
(284 B)
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atomic_pointer.go
(2.62 KB)
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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
(360 B)
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callers_test.go
(7.72 KB)
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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
(3.17 KB)
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cgocall.go
(18.88 KB)
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cgocallback.go
(317 B)
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cgocheck.go
(6.83 KB)
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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
(1.4 KB)
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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
(1.05 KB)
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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
(20.96 KB)
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crash_unix_test.go
(8.52 KB)
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debug
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debug.go
(1.63 KB)
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debug_test.go
(6.82 KB)
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debugcall.go
(6.21 KB)
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debuglog.go
(17.49 KB)
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debuglog_off.go
(377 B)
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debuglog_on.go
(1.11 KB)
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debuglog_test.go
(4.56 KB)
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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
(2.84 KB)
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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
(4.18 KB)
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defs_aix_ppc64.go
(3.63 KB)
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defs_arm_linux.go
(2.69 KB)
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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
(3.05 KB)
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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
(3.09 KB)
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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
(1.63 KB)
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defs_plan9_amd64.go
(1.82 KB)
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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
(2.09 KB)
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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
(2.3 KB)
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rt0_linux_386.s
(450 B)
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rt0_linux_amd64.s
(307 B)
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rt0_linux_arm.s
(1007 B)
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rt0_linux_arm64.s
(2.39 KB)
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rt0_linux_mips64x.s
(1.03 KB)
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rt0_linux_mipsx.s
(835 B)
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rt0_linux_ppc64.s
(865 B)
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rt0_linux_ppc64le.s
(3.88 KB)
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rt0_linux_riscv64.s
(370 B)
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rt0_linux_s390x.s
(676 B)
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rt0_netbsd_386.s
(452 B)
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rt0_netbsd_amd64.s
(309 B)
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rt0_netbsd_arm.s
(296 B)
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rt0_netbsd_arm64.s
(2.38 KB)
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rt0_openbsd_386.s
(454 B)
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rt0_openbsd_amd64.s
(311 B)
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rt0_openbsd_arm.s
(298 B)
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rt0_openbsd_arm64.s
(2.54 KB)
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rt0_openbsd_mips64.s
(976 B)
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rt0_plan9_386.s
(523 B)
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rt0_plan9_amd64.s
(481 B)
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rt0_plan9_arm.s
(397 B)
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rt0_solaris_amd64.s
(311 B)
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rt0_windows_386.s
(1.28 KB)
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rt0_windows_amd64.s
(986 B)
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rt0_windows_arm.s
(386 B)
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rt0_windows_arm64.s
(725 B)
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runtime-gdb.py
(15.02 KB)
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runtime-gdb_test.go
(20.19 KB)
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runtime-lldb_test.go
(4.95 KB)
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runtime.go
(1.42 KB)
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runtime1.go
(12.63 KB)
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runtime2.go
(42.27 KB)
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runtime_linux_test.go
(1.46 KB)
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runtime_mmap_test.go
(1.91 KB)
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runtime_test.go
(7.81 KB)
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runtime_unix_test.go
(1.29 KB)
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rwmutex.go
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Editing: softfloat64.go
// Copyright 2010 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. // Software IEEE754 64-bit floating point. // Only referred to (and thus linked in) by arm port // and by tests in this directory. package runtime const ( mantbits64 uint = 52 expbits64 uint = 11 bias64 = -1<<(expbits64-1) + 1 nan64 uint64 = (1<<expbits64-1)<<mantbits64 + 1<<(mantbits64-1) // quiet NaN, 0 payload inf64 uint64 = (1<<expbits64 - 1) << mantbits64 neg64 uint64 = 1 << (expbits64 + mantbits64) mantbits32 uint = 23 expbits32 uint = 8 bias32 = -1<<(expbits32-1) + 1 nan32 uint32 = (1<<expbits32-1)<<mantbits32 + 1<<(mantbits32-1) // quiet NaN, 0 payload inf32 uint32 = (1<<expbits32 - 1) << mantbits32 neg32 uint32 = 1 << (expbits32 + mantbits32) ) func funpack64(f uint64) (sign, mant uint64, exp int, inf, nan bool) { sign = f & (1 << (mantbits64 + expbits64)) mant = f & (1<<mantbits64 - 1) exp = int(f>>mantbits64) & (1<<expbits64 - 1) switch exp { case 1<<expbits64 - 1: if mant != 0 { nan = true return } inf = true return case 0: // denormalized if mant != 0 { exp += bias64 + 1 for mant < 1<<mantbits64 { mant <<= 1 exp-- } } default: // add implicit top bit mant |= 1 << mantbits64 exp += bias64 } return } func funpack32(f uint32) (sign, mant uint32, exp int, inf, nan bool) { sign = f & (1 << (mantbits32 + expbits32)) mant = f & (1<<mantbits32 - 1) exp = int(f>>mantbits32) & (1<<expbits32 - 1) switch exp { case 1<<expbits32 - 1: if mant != 0 { nan = true return } inf = true return case 0: // denormalized if mant != 0 { exp += bias32 + 1 for mant < 1<<mantbits32 { mant <<= 1 exp-- } } default: // add implicit top bit mant |= 1 << mantbits32 exp += bias32 } return } func fpack64(sign, mant uint64, exp int, trunc uint64) uint64 { mant0, exp0, trunc0 := mant, exp, trunc if mant == 0 { return sign } for mant < 1<<mantbits64 { mant <<= 1 exp-- } for mant >= 4<<mantbits64 { trunc |= mant & 1 mant >>= 1 exp++ } if mant >= 2<<mantbits64 { if mant&1 != 0 && (trunc != 0 || mant&2 != 0) { mant++ if mant >= 4<<mantbits64 { mant >>= 1 exp++ } } mant >>= 1 exp++ } if exp >= 1<<expbits64-1+bias64 { return sign ^ inf64 } if exp < bias64+1 { if exp < bias64-int(mantbits64) { return sign | 0 } // repeat expecting denormal mant, exp, trunc = mant0, exp0, trunc0 for exp < bias64 { trunc |= mant & 1 mant >>= 1 exp++ } if mant&1 != 0 && (trunc != 0 || mant&2 != 0) { mant++ } mant >>= 1 exp++ if mant < 1<<mantbits64 { return sign | mant } } return sign | uint64(exp-bias64)<<mantbits64 | mant&(1<<mantbits64-1) } func fpack32(sign, mant uint32, exp int, trunc uint32) uint32 { mant0, exp0, trunc0 := mant, exp, trunc if mant == 0 { return sign } for mant < 1<<mantbits32 { mant <<= 1 exp-- } for mant >= 4<<mantbits32 { trunc |= mant & 1 mant >>= 1 exp++ } if mant >= 2<<mantbits32 { if mant&1 != 0 && (trunc != 0 || mant&2 != 0) { mant++ if mant >= 4<<mantbits32 { mant >>= 1 exp++ } } mant >>= 1 exp++ } if exp >= 1<<expbits32-1+bias32 { return sign ^ inf32 } if exp < bias32+1 { if exp < bias32-int(mantbits32) { return sign | 0 } // repeat expecting denormal mant, exp, trunc = mant0, exp0, trunc0 for exp < bias32 { trunc |= mant & 1 mant >>= 1 exp++ } if mant&1 != 0 && (trunc != 0 || mant&2 != 0) { mant++ } mant >>= 1 exp++ if mant < 1<<mantbits32 { return sign | mant } } return sign | uint32(exp-bias32)<<mantbits32 | mant&(1<<mantbits32-1) } func fadd64(f, g uint64) uint64 { fs, fm, fe, fi, fn := funpack64(f) gs, gm, ge, gi, gn := funpack64(g) // Special cases. switch { case fn || gn: // NaN + x or x + NaN = NaN return nan64 case fi && gi && fs != gs: // +Inf + -Inf or -Inf + +Inf = NaN return nan64 case fi: // Β±Inf + g = Β±Inf return f case gi: // f + Β±Inf = Β±Inf return g case fm == 0 && gm == 0 && fs != 0 && gs != 0: // -0 + -0 = -0 return f case fm == 0: // 0 + g = g but 0 + -0 = +0 if gm == 0 { g ^= gs } return g case gm == 0: // f + 0 = f return f } if fe < ge || fe == ge && fm < gm { f, g, fs, fm, fe, gs, gm, ge = g, f, gs, gm, ge, fs, fm, fe } shift := uint(fe - ge) fm <<= 2 gm <<= 2 trunc := gm & (1<<shift - 1) gm >>= shift if fs == gs { fm += gm } else { fm -= gm if trunc != 0 { fm-- } } if fm == 0 { fs = 0 } return fpack64(fs, fm, fe-2, trunc) } func fsub64(f, g uint64) uint64 { return fadd64(f, fneg64(g)) } func fneg64(f uint64) uint64 { return f ^ (1 << (mantbits64 + expbits64)) } func fmul64(f, g uint64) uint64 { fs, fm, fe, fi, fn := funpack64(f) gs, gm, ge, gi, gn := funpack64(g) // Special cases. switch { case fn || gn: // NaN * g or f * NaN = NaN return nan64 case fi && gi: // Inf * Inf = Inf (with sign adjusted) return f ^ gs case fi && gm == 0, fm == 0 && gi: // 0 * Inf = Inf * 0 = NaN return nan64 case fm == 0: // 0 * x = 0 (with sign adjusted) return f ^ gs case gm == 0: // x * 0 = 0 (with sign adjusted) return g ^ fs } // 53-bit * 53-bit = 107- or 108-bit lo, hi := mullu(fm, gm) shift := mantbits64 - 1 trunc := lo & (1<<shift - 1) mant := hi<<(64-shift) | lo>>shift return fpack64(fs^gs, mant, fe+ge-1, trunc) } func fdiv64(f, g uint64) uint64 { fs, fm, fe, fi, fn := funpack64(f) gs, gm, ge, gi, gn := funpack64(g) // Special cases. switch { case fn || gn: // NaN / g = f / NaN = NaN return nan64 case fi && gi: // Β±Inf / Β±Inf = NaN return nan64 case !fi && !gi && fm == 0 && gm == 0: // 0 / 0 = NaN return nan64 case fi, !gi && gm == 0: // Inf / g = f / 0 = Inf return fs ^ gs ^ inf64 case gi, fm == 0: // f / Inf = 0 / g = Inf return fs ^ gs ^ 0 } _, _, _, _ = fi, fn, gi, gn // 53-bit<<54 / 53-bit = 53- or 54-bit. shift := mantbits64 + 2 q, r := divlu(fm>>(64-shift), fm<<shift, gm) return fpack64(fs^gs, q, fe-ge-2, r) } func f64to32(f uint64) uint32 { fs, fm, fe, fi, fn := funpack64(f) if fn { return nan32 } fs32 := uint32(fs >> 32) if fi { return fs32 ^ inf32 } const d = mantbits64 - mantbits32 - 1 return fpack32(fs32, uint32(fm>>d), fe-1, uint32(fm&(1<<d-1))) } func f32to64(f uint32) uint64 { const d = mantbits64 - mantbits32 fs, fm, fe, fi, fn := funpack32(f) if fn { return nan64 } fs64 := uint64(fs) << 32 if fi { return fs64 ^ inf64 } return fpack64(fs64, uint64(fm)<<d, fe, 0) } func fcmp64(f, g uint64) (cmp int32, isnan bool) { fs, fm, _, fi, fn := funpack64(f) gs, gm, _, gi, gn := funpack64(g) switch { case fn, gn: // flag NaN return 0, true case !fi && !gi && fm == 0 && gm == 0: // Β±0 == Β±0 return 0, false case fs > gs: // f < 0, g > 0 return -1, false case fs < gs: // f > 0, g < 0 return +1, false // Same sign, not NaN. // Can compare encodings directly now. // Reverse for sign. case fs == 0 && f < g, fs != 0 && f > g: return -1, false case fs == 0 && f > g, fs != 0 && f < g: return +1, false } // f == g return 0, false } func f64toint(f uint64) (val int64, ok bool) { fs, fm, fe, fi, fn := funpack64(f) switch { case fi, fn: // NaN return 0, false case fe < -1: // f < 0.5 return 0, false case fe > 63: // f >= 2^63 if fs != 0 && fm == 0 { // f == -2^63 return -1 << 63, true } if fs != 0 { return 0, false } return 0, false } for fe > int(mantbits64) { fe-- fm <<= 1 } for fe < int(mantbits64) { fe++ fm >>= 1 } val = int64(fm) if fs != 0 { val = -val } return val, true } func fintto64(val int64) (f uint64) { fs := uint64(val) & (1 << 63) mant := uint64(val) if fs != 0 { mant = -mant } return fpack64(fs, mant, int(mantbits64), 0) } // 64x64 -> 128 multiply. // adapted from hacker's delight. func mullu(u, v uint64) (lo, hi uint64) { const ( s = 32 mask = 1<<s - 1 ) u0 := u & mask u1 := u >> s v0 := v & mask v1 := v >> s w0 := u0 * v0 t := u1*v0 + w0>>s w1 := t & mask w2 := t >> s w1 += u0 * v1 return u * v, u1*v1 + w2 + w1>>s } // 128/64 -> 64 quotient, 64 remainder. // adapted from hacker's delight func divlu(u1, u0, v uint64) (q, r uint64) { const b = 1 << 32 if u1 >= v { return 1<<64 - 1, 1<<64 - 1 } // s = nlz(v); v <<= s s := uint(0) for v&(1<<63) == 0 { s++ v <<= 1 } vn1 := v >> 32 vn0 := v & (1<<32 - 1) un32 := u1<<s | u0>>(64-s) un10 := u0 << s un1 := un10 >> 32 un0 := un10 & (1<<32 - 1) q1 := un32 / vn1 rhat := un32 - q1*vn1 again1: if q1 >= b || q1*vn0 > b*rhat+un1 { q1-- rhat += vn1 if rhat < b { goto again1 } } un21 := un32*b + un1 - q1*v q0 := un21 / vn1 rhat = un21 - q0*vn1 again2: if q0 >= b || q0*vn0 > b*rhat+un0 { q0-- rhat += vn1 if rhat < b { goto again2 } } return q1*b + q0, (un21*b + un0 - q0*v) >> s } func fadd32(x, y uint32) uint32 { return f64to32(fadd64(f32to64(x), f32to64(y))) } func fmul32(x, y uint32) uint32 { return f64to32(fmul64(f32to64(x), f32to64(y))) } func fdiv32(x, y uint32) uint32 { return f64to32(fdiv64(f32to64(x), f32to64(y))) } func feq32(x, y uint32) bool { cmp, nan := fcmp64(f32to64(x), f32to64(y)) return cmp == 0 && !nan } func fgt32(x, y uint32) bool { cmp, nan := fcmp64(f32to64(x), f32to64(y)) return cmp >= 1 && !nan } func fge32(x, y uint32) bool { cmp, nan := fcmp64(f32to64(x), f32to64(y)) return cmp >= 0 && !nan } func feq64(x, y uint64) bool { cmp, nan := fcmp64(x, y) return cmp == 0 && !nan } func fgt64(x, y uint64) bool { cmp, nan := fcmp64(x, y) return cmp >= 1 && !nan } func fge64(x, y uint64) bool { cmp, nan := fcmp64(x, y) return cmp >= 0 && !nan } func fint32to32(x int32) uint32 { return f64to32(fintto64(int64(x))) } func fint32to64(x int32) uint64 { return fintto64(int64(x)) } func fint64to32(x int64) uint32 { return f64to32(fintto64(x)) } func fint64to64(x int64) uint64 { return fintto64(x) } func f32toint32(x uint32) int32 { val, _ := f64toint(f32to64(x)) return int32(val) } func f32toint64(x uint32) int64 { val, _ := f64toint(f32to64(x)) return val } func f64toint32(x uint64) int32 { val, _ := f64toint(x) return int32(val) } func f64toint64(x uint64) int64 { val, _ := f64toint(x) return val } func f64touint64(x float64) uint64 { if x < float64(1<<63) { return uint64(int64(x)) } y := x - float64(1<<63) z := uint64(int64(y)) return z | (1 << 63) } func f32touint64(x float32) uint64 { if x < float32(1<<63) { return uint64(int64(x)) } y := x - float32(1<<63) z := uint64(int64(y)) return z | (1 << 63) } func fuint64to64(x uint64) float64 { if int64(x) >= 0 { return float64(int64(x)) } // See ../cmd/compile/internal/gc/ssa.go:uint64Tofloat y := x & 1 z := x >> 1 z = z | y r := float64(int64(z)) return r + r } func fuint64to32(x uint64) float32 { return float32(fuint64to64(x)) }
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