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golang
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1.22.0
/
src
/
runtime
/
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..
📄
HACKING.md
(13.85 KB)
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Makefile
(178 B)
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abi_test.go
(2.83 KB)
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alg.go
(10.99 KB)
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align_runtime_test.go
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align_test.go
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arena.go
(31.66 KB)
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arena_test.go
(13.39 KB)
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asan
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asan.go
(1.55 KB)
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asan0.go
(760 B)
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asan_amd64.s
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asan_arm64.s
(2.14 KB)
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asan_loong64.s
(2.12 KB)
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asan_ppc64le.s
(2.75 KB)
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asan_riscv64.s
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asm.s
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asm_386.s
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asm_amd64.h
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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_loong64.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_loong64.s
(245 B)
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atomic_mips64x.s
(300 B)
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atomic_mipsx.s
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atomic_pointer.go
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atomic_ppc64x.s
(437 B)
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atomic_riscv64.s
(275 B)
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auxv_none.go
(298 B)
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callers_test.go
(12.13 KB)
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cgo
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cgo.go
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cgo_mmap.go
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cgo_ppc64x.go
(418 B)
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cgo_sigaction.go
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cgocall.go
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cgocallback.go
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cgocheck.go
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chan.go
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chan_test.go
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chanbarrier_test.go
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checkptr.go
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checkptr_test.go
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closure_test.go
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compiler.go
(410 B)
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complex.go
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complex_test.go
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conv_wasm_test.go
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coro.go
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coverage
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covercounter.go
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covermeta.go
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cpuflags.go
(810 B)
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cpuflags_amd64.go
(533 B)
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cpuflags_arm64.go
(312 B)
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cpuprof.go
(7.94 KB)
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cputicks.go
(437 B)
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crash_cgo_test.go
(23.35 KB)
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crash_test.go
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crash_unix_test.go
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create_file_nounix.go
(305 B)
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create_file_unix.go
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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
(357 B)
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debuglog_on.go
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debuglog_test.go
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defer_test.go
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defs1_linux.go
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defs1_netbsd_386.go
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defs1_netbsd_amd64.go
(3.14 KB)
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defs1_netbsd_arm.go
(3.03 KB)
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defs1_netbsd_arm64.go
(3.25 KB)
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defs1_solaris_amd64.go
(4.01 KB)
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defs2_linux.go
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defs3_linux.go
(1.09 KB)
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defs_aix.go
(4.17 KB)
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defs_aix_ppc64.go
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defs_arm_linux.go
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defs_darwin.go
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defs_darwin_amd64.go
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defs_darwin_arm64.go
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defs_dragonfly.go
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defs_dragonfly_amd64.go
(3.41 KB)
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defs_freebsd.go
(3.96 KB)
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defs_freebsd_386.go
(4.52 KB)
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defs_freebsd_amd64.go
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defs_freebsd_arm.go
(3.92 KB)
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defs_freebsd_arm64.go
(4.18 KB)
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defs_freebsd_riscv64.go
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defs_illumos_amd64.go
(285 B)
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defs_linux.go
(2.92 KB)
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defs_linux_386.go
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defs_linux_amd64.go
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defs_linux_arm.go
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defs_linux_arm64.go
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defs_linux_loong64.go
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defs_linux_mips64x.go
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defs_linux_mipsx.go
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defs_linux_ppc64.go
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defs_linux_ppc64le.go
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defs_linux_riscv64.go
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defs_linux_s390x.go
(3.16 KB)
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defs_netbsd.go
(2.83 KB)
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defs_netbsd_386.go
(855 B)
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defs_netbsd_amd64.go
(1.01 KB)
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defs_netbsd_arm.go
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defs_openbsd.go
(3.06 KB)
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defs_openbsd_386.go
(2.91 KB)
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defs_openbsd_amd64.go
(3.11 KB)
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defs_openbsd_arm.go
(3.03 KB)
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defs_openbsd_arm64.go
(2.78 KB)
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defs_openbsd_mips64.go
(2.75 KB)
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defs_openbsd_ppc64.go
(3 KB)
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defs_openbsd_riscv64.go
(2.89 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
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defs_solaris_amd64.go
(1004 B)
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defs_windows.go
(2.25 KB)
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defs_windows_386.go
(2.28 KB)
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defs_windows_amd64.go
(3.19 KB)
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defs_windows_arm.go
(2.57 KB)
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defs_windows_arm64.go
(3.07 KB)
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duff_386.s
(8.24 KB)
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duff_amd64.s
(5.64 KB)
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duff_arm.s
(7.11 KB)
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duff_arm64.s
(5.27 KB)
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duff_loong64.s
(11.9 KB)
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duff_mips64x.s
(11.28 KB)
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duff_ppc64x.s
(7.06 KB)
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duff_riscv64.s
(11.4 KB)
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duff_s390x.s
(507 B)
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ehooks_test.go
(2.04 KB)
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env_plan9.go
(3 KB)
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env_posix.go
(1.56 KB)
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env_test.go
(1.16 KB)
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error.go
(9.29 KB)
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example_test.go
(1.55 KB)
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exithook.go
(2.32 KB)
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export_aix_test.go
(207 B)
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export_arm_test.go
(226 B)
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export_darwin_test.go
(207 B)
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export_debug_amd64_test.go
(3.6 KB)
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export_debug_arm64_test.go
(3.49 KB)
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export_debug_ppc64le_test.go
(3.5 KB)
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export_debug_test.go
(5.07 KB)
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export_debuglog_test.go
(1.27 KB)
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export_linux_test.go
(378 B)
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export_mmap_test.go
(429 B)
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export_pipe2_test.go
(310 B)
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export_pipe_test.go
(219 B)
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export_test.go
(50.52 KB)
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export_unix_test.go
(2.27 KB)
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export_windows_test.go
(903 B)
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extern.go
(18.58 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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fds_nonunix.go
(256 B)
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fds_test.go
(1.43 KB)
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fds_unix.go
(1.27 KB)
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float.go
(1.35 KB)
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float_test.go
(699 B)
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funcdata.h
(2.53 KB)
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gc_test.go
(20.32 KB)
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gcinfo_test.go
(5.95 KB)
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go_tls.h
(366 B)
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hash32.go
(1.58 KB)
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hash64.go
(1.95 KB)
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hash_test.go
(17.24 KB)
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heap_test.go
(529 B)
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heapdump.go
(17.88 KB)
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histogram.go
(7.3 KB)
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histogram_test.go
(3.51 KB)
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iface.go
(20.92 KB)
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iface_test.go
(7.45 KB)
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import_test.go
(1.42 KB)
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importx_test.go
(763 B)
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internal
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lfstack.go
(2.03 KB)
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lfstack_test.go
(2.74 KB)
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libfuzzer.go
(6.34 KB)
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libfuzzer_amd64.s
(5.03 KB)
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libfuzzer_arm64.s
(3.15 KB)
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lock_futex.go
(5.4 KB)
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lock_js.go
(7.28 KB)
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lock_sema.go
(6.75 KB)
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lock_wasip1.go
(2.01 KB)
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lockrank.go
(18.19 KB)
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lockrank_off.go
(1.17 KB)
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lockrank_on.go
(10.27 KB)
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lockrank_test.go
(856 B)
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malloc.go
(58.5 KB)
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malloc_test.go
(10.64 KB)
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map.go
(52.17 KB)
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map_benchmark_test.go
(10.59 KB)
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map_fast32.go
(12.74 KB)
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map_fast64.go
(12.92 KB)
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map_faststr.go
(14.32 KB)
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map_test.go
(31.75 KB)
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mbarrier.go
(13.78 KB)
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mbitmap.go
(22.54 KB)
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mbitmap_allocheaders.go
(44.67 KB)
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mbitmap_noallocheaders.go
(28.95 KB)
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mcache.go
(10 KB)
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mcentral.go
(8.05 KB)
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mcheckmark.go
(2.85 KB)
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mem.go
(6.72 KB)
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mem_aix.go
(2.01 KB)
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mem_bsd.go
(2.21 KB)
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mem_darwin.go
(1.96 KB)
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mem_js.go
(457 B)
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mem_linux.go
(4.98 KB)
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mem_plan9.go
(447 B)
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mem_sbrk.go
(4.19 KB)
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mem_wasip1.go
(392 B)
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mem_wasm.go
(488 B)
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mem_windows.go
(3.88 KB)
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memclr_386.s
(2.38 KB)
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memclr_amd64.s
(4.91 KB)
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memclr_arm.s
(2.6 KB)
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memclr_arm64.s
(3.62 KB)
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memclr_loong64.s
(843 B)
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memclr_mips64x.s
(1.72 KB)
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memclr_mipsx.s
(1.32 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
(4.44 KB)
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memclr_riscv64.s
(1.71 KB)
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memclr_s390x.s
(1.96 KB)
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memclr_wasm.s
(485 B)
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memmove_386.s
(4.42 KB)
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memmove_amd64.s
(12.48 KB)
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memmove_arm.s
(5.9 KB)
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memmove_arm64.s
(5.96 KB)
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memmove_linux_amd64_test.go
(1.53 KB)
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memmove_loong64.s
(1.87 KB)
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memmove_mips64x.s
(1.83 KB)
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memmove_mipsx.s
(4.4 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
(4.91 KB)
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memmove_riscv64.s
(5.46 KB)
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memmove_s390x.s
(2.92 KB)
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memmove_test.go
(21.23 KB)
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memmove_wasm.s
(479 B)
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metrics
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metrics.go
(26.01 KB)
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metrics_test.go
(42.46 KB)
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mfinal.go
(18.91 KB)
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mfinal_test.go
(5.57 KB)
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mfixalloc.go
(3.13 KB)
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mgc.go
(59.29 KB)
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mgclimit.go
(17.28 KB)
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mgclimit_test.go
(9.02 KB)
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mgcmark.go
(53.07 KB)
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mgcpacer.go
(55.36 KB)
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mgcpacer_test.go
(39.26 KB)
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mgcscavenge.go
(52.32 KB)
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mgcscavenge_test.go
(25.2 KB)
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mgcstack.go
(10.58 KB)
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mgcsweep.go
(32.26 KB)
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mgcwork.go
(12.89 KB)
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mheap.go
(72.64 KB)
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minmax.go
(1.46 KB)
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minmax_test.go
(3.31 KB)
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mkduff.go
(8.04 KB)
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mkfastlog2table.go
(3.08 KB)
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mklockrank.go
(9 KB)
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mkpreempt.go
(15.33 KB)
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mksizeclasses.go
(9.52 KB)
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mmap.go
(844 B)
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mpagealloc.go
(39.23 KB)
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mpagealloc_32bit.go
(4.56 KB)
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mpagealloc_64bit.go
(9.34 KB)
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mpagealloc_test.go
(32.59 KB)
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mpagecache.go
(5.59 KB)
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mpagecache_test.go
(10.79 KB)
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mpallocbits.go
(12.58 KB)
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mpallocbits_test.go
(13.69 KB)
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mprof.go
(47.4 KB)
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mranges.go
(14.46 KB)
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mranges_test.go
(5.68 KB)
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msan
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msan.go
(1.5 KB)
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msan0.go
(725 B)
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msan_amd64.s
(2.3 KB)
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msan_arm64.s
(1.98 KB)
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msan_loong64.s
(1.96 KB)
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msize_allocheaders.go
(1.32 KB)
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msize_noallocheaders.go
(915 B)
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mspanset.go
(13.12 KB)
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mstats.go
(33.81 KB)
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mwbbuf.go
(8.13 KB)
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nbpipe_pipe.go
(405 B)
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nbpipe_pipe2.go
(344 B)
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nbpipe_pipe_test.go
(706 B)
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nbpipe_test.go
(1.99 KB)
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net_plan9.go
(645 B)
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netpoll.go
(20.55 KB)
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netpoll_aix.go
(5.06 KB)
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netpoll_epoll.go
(4.4 KB)
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netpoll_fake.go
(664 B)
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netpoll_kqueue.go
(5.62 KB)
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netpoll_os_test.go
(520 B)
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netpoll_solaris.go
(11.2 KB)
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netpoll_stub.go
(1.48 KB)
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netpoll_wasip1.go
(6.08 KB)
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netpoll_windows.go
(4.01 KB)
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nonwindows_stub.go
(729 B)
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norace_linux_test.go
(915 B)
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norace_test.go
(983 B)
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numcpu_freebsd_test.go
(381 B)
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os2_aix.go
(20.88 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
(3.94 KB)
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os3_solaris.go
(17.59 KB)
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os_aix.go
(8.89 KB)
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os_android.go
(463 B)
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os_darwin.go
(11.92 KB)
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os_darwin_arm64.go
(329 B)
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os_dragonfly.go
(7.14 KB)
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os_freebsd.go
(11.64 KB)
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os_freebsd2.go
(603 B)
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os_freebsd_amd64.go
(658 B)
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os_freebsd_arm.go
(1.45 KB)
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os_freebsd_arm64.go
(320 B)
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os_freebsd_noauxv.go
(241 B)
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os_freebsd_riscv64.go
(198 B)
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os_illumos.go
(3.93 KB)
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os_js.go
(767 B)
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os_linux.go
(25.71 KB)
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os_linux_arm.go
(1.51 KB)
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os_linux_arm64.go
(478 B)
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os_linux_be64.go
(806 B)
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os_linux_generic.go
(870 B)
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os_linux_loong64.go
(263 B)
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os_linux_mips64x.go
(996 B)
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os_linux_mipsx.go
(987 B)
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os_linux_noauxv.go
(337 B)
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os_linux_novdso.go
(347 B)
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os_linux_ppc64x.go
(526 B)
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os_linux_riscv64.go
(198 B)
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os_linux_s390x.go
(825 B)
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os_linux_x86.go
(234 B)
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os_netbsd.go
(10.12 KB)
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os_netbsd_386.go
(617 B)
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os_netbsd_amd64.go
(614 B)
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os_netbsd_arm.go
(1.07 KB)
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os_netbsd_arm64.go
(769 B)
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os_nonopenbsd.go
(437 B)
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os_only_solaris.go
(357 B)
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os_openbsd.go
(6.23 KB)
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os_openbsd_arm.go
(662 B)
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os_openbsd_arm64.go
(329 B)
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os_openbsd_libc.go
(1.49 KB)
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os_openbsd_mips64.go
(329 B)
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os_openbsd_syscall.go
(1.36 KB)
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os_openbsd_syscall1.go
(441 B)
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os_openbsd_syscall2.go
(2.51 KB)
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os_plan9.go
(10.18 KB)
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os_plan9_arm.go
(375 B)
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os_solaris.go
(6.62 KB)
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os_unix.go
(436 B)
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os_unix_nonlinux.go
(374 B)
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os_wasip1.go
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Editing: mgcstack.go
// Copyright 2018 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. // Garbage collector: stack objects and stack tracing // See the design doc at https://docs.google.com/document/d/1un-Jn47yByHL7I0aVIP_uVCMxjdM5mpelJhiKlIqxkE/edit?usp=sharing // Also see issue 22350. // Stack tracing solves the problem of determining which parts of the // stack are live and should be scanned. It runs as part of scanning // a single goroutine stack. // // Normally determining which parts of the stack are live is easy to // do statically, as user code has explicit references (reads and // writes) to stack variables. The compiler can do a simple dataflow // analysis to determine liveness of stack variables at every point in // the code. See cmd/compile/internal/gc/plive.go for that analysis. // // However, when we take the address of a stack variable, determining // whether that variable is still live is less clear. We can still // look for static accesses, but accesses through a pointer to the // variable are difficult in general to track statically. That pointer // can be passed among functions on the stack, conditionally retained, // etc. // // Instead, we will track pointers to stack variables dynamically. // All pointers to stack-allocated variables will themselves be on the // stack somewhere (or in associated locations, like defer records), so // we can find them all efficiently. // // Stack tracing is organized as a mini garbage collection tracing // pass. The objects in this garbage collection are all the variables // on the stack whose address is taken, and which themselves contain a // pointer. We call these variables "stack objects". // // We begin by determining all the stack objects on the stack and all // the statically live pointers that may point into the stack. We then // process each pointer to see if it points to a stack object. If it // does, we scan that stack object. It may contain pointers into the // heap, in which case those pointers are passed to the main garbage // collection. It may also contain pointers into the stack, in which // case we add them to our set of stack pointers. // // Once we're done processing all the pointers (including the ones we // added during processing), we've found all the stack objects that // are live. Any dead stack objects are not scanned and their contents // will not keep heap objects live. Unlike the main garbage // collection, we can't sweep the dead stack objects; they live on in // a moribund state until the stack frame that contains them is // popped. // // A stack can look like this: // // +----------+ // | foo() | // | +------+ | // | | A | | <---\ // | +------+ | | // | | | // | +------+ | | // | | B | | | // | +------+ | | // | | | // +----------+ | // | bar() | | // | +------+ | | // | | C | | <-\ | // | +----|-+ | | | // | | | | | // | +----v-+ | | | // | | D ---------/ // | +------+ | | // | | | // +----------+ | // | baz() | | // | +------+ | | // | | E -------/ // | +------+ | // | ^ | // | F: --/ | // | | // +----------+ // // foo() calls bar() calls baz(). Each has a frame on the stack. // foo() has stack objects A and B. // bar() has stack objects C and D, with C pointing to D and D pointing to A. // baz() has a stack object E pointing to C, and a local variable F pointing to E. // // Starting from the pointer in local variable F, we will eventually // scan all of E, C, D, and A (in that order). B is never scanned // because there is no live pointer to it. If B is also statically // dead (meaning that foo() never accesses B again after it calls // bar()), then B's pointers into the heap are not considered live. package runtime import ( "internal/goarch" "runtime/internal/sys" "unsafe" ) const stackTraceDebug = false // Buffer for pointers found during stack tracing. // Must be smaller than or equal to workbuf. type stackWorkBuf struct { _ sys.NotInHeap stackWorkBufHdr obj [(_WorkbufSize - unsafe.Sizeof(stackWorkBufHdr{})) / goarch.PtrSize]uintptr } // Header declaration must come after the buf declaration above, because of issue #14620. type stackWorkBufHdr struct { _ sys.NotInHeap workbufhdr next *stackWorkBuf // linked list of workbufs // Note: we could theoretically repurpose lfnode.next as this next pointer. // It would save 1 word, but that probably isn't worth busting open // the lfnode API. } // Buffer for stack objects found on a goroutine stack. // Must be smaller than or equal to workbuf. type stackObjectBuf struct { _ sys.NotInHeap stackObjectBufHdr obj [(_WorkbufSize - unsafe.Sizeof(stackObjectBufHdr{})) / unsafe.Sizeof(stackObject{})]stackObject } type stackObjectBufHdr struct { _ sys.NotInHeap workbufhdr next *stackObjectBuf } func init() { if unsafe.Sizeof(stackWorkBuf{}) > unsafe.Sizeof(workbuf{}) { panic("stackWorkBuf too big") } if unsafe.Sizeof(stackObjectBuf{}) > unsafe.Sizeof(workbuf{}) { panic("stackObjectBuf too big") } } // A stackObject represents a variable on the stack that has had // its address taken. type stackObject struct { _ sys.NotInHeap off uint32 // offset above stack.lo size uint32 // size of object r *stackObjectRecord // info of the object (for ptr/nonptr bits). nil if object has been scanned. left *stackObject // objects with lower addresses right *stackObject // objects with higher addresses } // obj.r = r, but with no write barrier. // //go:nowritebarrier func (obj *stackObject) setRecord(r *stackObjectRecord) { // Types of stack objects are always in read-only memory, not the heap. // So not using a write barrier is ok. *(*uintptr)(unsafe.Pointer(&obj.r)) = uintptr(unsafe.Pointer(r)) } // A stackScanState keeps track of the state used during the GC walk // of a goroutine. type stackScanState struct { // stack limits stack stack // conservative indicates that the next frame must be scanned conservatively. // This applies only to the innermost frame at an async safe-point. conservative bool // buf contains the set of possible pointers to stack objects. // Organized as a LIFO linked list of buffers. // All buffers except possibly the head buffer are full. buf *stackWorkBuf freeBuf *stackWorkBuf // keep around one free buffer for allocation hysteresis // cbuf contains conservative pointers to stack objects. If // all pointers to a stack object are obtained via // conservative scanning, then the stack object may be dead // and may contain dead pointers, so it must be scanned // defensively. cbuf *stackWorkBuf // list of stack objects // Objects are in increasing address order. head *stackObjectBuf tail *stackObjectBuf nobjs int // root of binary tree for fast object lookup by address // Initialized by buildIndex. root *stackObject } // Add p as a potential pointer to a stack object. // p must be a stack address. func (s *stackScanState) putPtr(p uintptr, conservative bool) { if p < s.stack.lo || p >= s.stack.hi { throw("address not a stack address") } head := &s.buf if conservative { head = &s.cbuf } buf := *head if buf == nil { // Initial setup. buf = (*stackWorkBuf)(unsafe.Pointer(getempty())) buf.nobj = 0 buf.next = nil *head = buf } else if buf.nobj == len(buf.obj) { if s.freeBuf != nil { buf = s.freeBuf s.freeBuf = nil } else { buf = (*stackWorkBuf)(unsafe.Pointer(getempty())) } buf.nobj = 0 buf.next = *head *head = buf } buf.obj[buf.nobj] = p buf.nobj++ } // Remove and return a potential pointer to a stack object. // Returns 0 if there are no more pointers available. // // This prefers non-conservative pointers so we scan stack objects // precisely if there are any non-conservative pointers to them. func (s *stackScanState) getPtr() (p uintptr, conservative bool) { for _, head := range []**stackWorkBuf{&s.buf, &s.cbuf} { buf := *head if buf == nil { // Never had any data. continue } if buf.nobj == 0 { if s.freeBuf != nil { // Free old freeBuf. putempty((*workbuf)(unsafe.Pointer(s.freeBuf))) } // Move buf to the freeBuf. s.freeBuf = buf buf = buf.next *head = buf if buf == nil { // No more data in this list. continue } } buf.nobj-- return buf.obj[buf.nobj], head == &s.cbuf } // No more data in either list. if s.freeBuf != nil { putempty((*workbuf)(unsafe.Pointer(s.freeBuf))) s.freeBuf = nil } return 0, false } // addObject adds a stack object at addr of type typ to the set of stack objects. func (s *stackScanState) addObject(addr uintptr, r *stackObjectRecord) { x := s.tail if x == nil { // initial setup x = (*stackObjectBuf)(unsafe.Pointer(getempty())) x.next = nil s.head = x s.tail = x } if x.nobj > 0 && uint32(addr-s.stack.lo) < x.obj[x.nobj-1].off+x.obj[x.nobj-1].size { throw("objects added out of order or overlapping") } if x.nobj == len(x.obj) { // full buffer - allocate a new buffer, add to end of linked list y := (*stackObjectBuf)(unsafe.Pointer(getempty())) y.next = nil x.next = y s.tail = y x = y } obj := &x.obj[x.nobj] x.nobj++ obj.off = uint32(addr - s.stack.lo) obj.size = uint32(r.size) obj.setRecord(r) // obj.left and obj.right will be initialized by buildIndex before use. s.nobjs++ } // buildIndex initializes s.root to a binary search tree. // It should be called after all addObject calls but before // any call of findObject. func (s *stackScanState) buildIndex() { s.root, _, _ = binarySearchTree(s.head, 0, s.nobjs) } // Build a binary search tree with the n objects in the list // x.obj[idx], x.obj[idx+1], ..., x.next.obj[0], ... // Returns the root of that tree, and the buf+idx of the nth object after x.obj[idx]. // (The first object that was not included in the binary search tree.) // If n == 0, returns nil, x. func binarySearchTree(x *stackObjectBuf, idx int, n int) (root *stackObject, restBuf *stackObjectBuf, restIdx int) { if n == 0 { return nil, x, idx } var left, right *stackObject left, x, idx = binarySearchTree(x, idx, n/2) root = &x.obj[idx] idx++ if idx == len(x.obj) { x = x.next idx = 0 } right, x, idx = binarySearchTree(x, idx, n-n/2-1) root.left = left root.right = right return root, x, idx } // findObject returns the stack object containing address a, if any. // Must have called buildIndex previously. func (s *stackScanState) findObject(a uintptr) *stackObject { off := uint32(a - s.stack.lo) obj := s.root for { if obj == nil { return nil } if off < obj.off { obj = obj.left continue } if off >= obj.off+obj.size { obj = obj.right continue } return obj } }
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