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cgo
[ DIR ]
drwxr-xr-x
debug
[ DIR ]
drwxr-xr-x
internal
[ DIR ]
drwxr-xr-x
msan
[ DIR ]
drwxr-xr-x
pprof
[ DIR ]
drwxr-xr-x
race
[ DIR ]
drwxr-xr-x
testdata
[ DIR ]
drwxr-xr-x
trace
[ DIR ]
drwxr-xr-x
HACKING.md
13.07
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Makefile
178
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alg.go
10.18
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asm.s
1.16
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asm_386.s
40.2
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asm_amd64.s
45.78
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asm_arm.s
30.89
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asm_arm64.s
33.12
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asm_mips64x.s
22.45
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asm_mipsx.s
24.72
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asm_ppc64x.h
1023
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asm_ppc64x.s
29.39
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asm_riscv64.s
17.38
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asm_s390x.s
26.35
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asm_wasm.s
9.65
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atomic_arm64.s
259
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atomic_mips64x.s
296
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atomic_mipsx.s
258
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atomic_pointer.go
2.62
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atomic_ppc64x.s
433
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atomic_riscv64.s
307
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auxv_none.go
358
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callers_test.go
7.7
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cgo.go
2.01
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cgo_mmap.go
2.38
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cgo_ppc64x.go
411
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cgo_sigaction.go
3.09
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cgocall.go
21.38
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cgocallback.go
317
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cgocheck.go
6.8
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chan.go
19.71
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chan_test.go
21.27
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chanbarrier_test.go
1.4
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checkptr.go
2.5
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checkptr_test.go
1.27
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closure_test.go
936
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compiler.go
413
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complex.go
1.59
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complex_test.go
1.05
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cpuflags.go
740
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cpuflags_amd64.go
533
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cpuprof.go
6.65
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cputicks.go
478
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crash_cgo_test.go
13.71
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crash_nonunix_test.go
385
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crash_test.go
20.24
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crash_unix_test.go
8.89
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debug.go
1.63
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debug_test.go
6.16
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debugcall.go
2.83
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debuglog.go
17.08
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debuglog_off.go
356
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debuglog_on.go
1.09
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debuglog_test.go
4.56
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defer_test.go
9.98
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defs1_linux.go
844
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defs1_netbsd_386.go
2.84
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defs1_netbsd_amd64.go
3.07
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defs1_netbsd_arm.go
2.96
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defs1_netbsd_arm64.go
3.18
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defs1_solaris_amd64.go
4.02
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defs2_linux.go
3.51
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defs3_linux.go
1.09
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defs_aix.go
4.16
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defs_aix_ppc64.go
3.61
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defs_arm_linux.go
2.67
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defs_darwin.go
3.84
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defs_darwin_386.go
5.98
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defs_darwin_amd64.go
6.07
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defs_darwin_arm.go
3.78
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defs_darwin_arm64.go
3.84
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defs_dragonfly.go
2.54
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defs_dragonfly_amd64.go
3.25
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defs_freebsd.go
3.84
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defs_freebsd_386.go
4.35
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defs_freebsd_amd64.go
4.62
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defs_freebsd_arm.go
3.68
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defs_freebsd_arm64.go
4
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defs_illumos_amd64.go
285
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defs_linux.go
3.04
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defs_linux_386.go
4.05
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defs_linux_amd64.go
4.56
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defs_linux_arm.go
3.31
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defs_linux_arm64.go
3.23
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defs_linux_mips64x.go
3.04
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defs_linux_mipsx.go
3.18
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defs_linux_ppc64.go
3.28
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defs_linux_ppc64le.go
3.28
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defs_linux_riscv64.go
3.27
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defs_linux_s390x.go
2.76
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defs_netbsd.go
2.74
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defs_netbsd_386.go
854
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defs_netbsd_amd64.go
1.01
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defs_netbsd_arm.go
763
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defs_openbsd.go
2.6
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defs_openbsd_386.go
2.63
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defs_openbsd_amd64.go
2.83
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defs_openbsd_arm.go
2.74
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defs_openbsd_arm64.go
2.34
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defs_plan9_386.go
1.47
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defs_plan9_amd64.go
1.66
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defs_plan9_arm.go
1.73
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defs_solaris.go
3.33
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defs_solaris_amd64.go
1003
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defs_windows.go
2.07
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defs_windows_386.go
3.75
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defs_windows_amd64.go
4.51
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defs_windows_arm.go
3.59
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duff_386.s
8.24
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duff_amd64.s
5.53
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duff_arm.s
7.11
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duff_arm64.s
5.25
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duff_mips64x.s
11.28
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duff_ppc64x.s
2.45
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duff_s390x.s
507
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env_plan9.go
855
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env_posix.go
1.82
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env_test.go
1.28
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error.go
7.26
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example_test.go
1.34
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export_aix_test.go
204
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export_arm_test.go
226
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export_darwin_test.go
351
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export_debug_test.go
5.28
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export_debuglog_test.go
1.27
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export_futex_test.go
529
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export_linux_test.go
429
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export_mmap_test.go
481
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export_solaris_test.go
282
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export_test.go
23.58
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export_unix_test.go
2.28
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export_windows_test.go
652
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extern.go
11.6
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fastlog2.go
1.22
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fastlog2_test.go
784
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fastlog2table.go
904
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float.go
1.35
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funcdata.h
2.44
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futex_test.go
2.1
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gc_test.go
13.22
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gcinfo_test.go
6.18
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go_tls.h
366
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hash32.go
2.51
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hash64.go
2.6
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hash_test.go
17.54
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heapdump.go
17.1
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iface.go
15.78
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iface_test.go
6.81
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lfstack.go
1.77
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lfstack_32bit.go
522
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lfstack_64bit.go
2.15
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lfstack_test.go
2.78
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libfuzzer.go
2.58
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libfuzzer_amd64.s
940
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libfuzzer_arm64.s
751
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lock_futex.go
5.06
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lock_js.go
5.45
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lock_sema.go
6.6
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malloc.go
48.32
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malloc_test.go
9.37
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map.go
42.13
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map_benchmark_test.go
10.16
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map_fast32.go
12.18
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map_fast64.go
12.37
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map_faststr.go
13.82
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map_test.go
27.11
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mbarrier.go
12.14
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mbitmap.go
67.53
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mcache.go
5.61
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mcentral.go
7.14
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mem_aix.go
1.93
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mem_bsd.go
2.05
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mem_darwin.go
1.88
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mem_js.go
2.32
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mem_linux.go
5.58
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mem_plan9.go
4.53
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mem_windows.go
3.86
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memclr_386.s
2.4
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memclr_amd64.s
3.65
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memclr_arm.s
2.44
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memclr_arm64.s
3.48
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memclr_mips64x.s
785
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memclr_mipsx.s
1.24
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memclr_plan9_386.s
905
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memclr_plan9_amd64.s
433
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memclr_ppc64x.s
4.2
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memclr_riscv64.s
848
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memclr_s390x.s
1.89
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memclr_wasm.s
544
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memmove_386.s
4.45
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memmove_amd64.s
12.33
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memmove_arm.s
5.9
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memmove_arm64.s
3.56
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memmove_linux_amd64_test.go
1.61
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memmove_mips64x.s
1.82
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memmove_mipsx.s
4.39
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memmove_plan9_386.s
3.06
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memmove_plan9_amd64.s
3.04
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memmove_ppc64x.s
3.33
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memmove_riscv64.s
1.81
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memmove_s390x.s
2.92
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memmove_test.go
10.97
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memmove_wasm.s
1.74
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mfinal.go
14.8
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mfinal_test.go
5.85
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mfixalloc.go
2.72
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mgc.go
74.87
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mgcmark.go
46.5
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mgcscavenge.go
30.95
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mgcscavenge_test.go
12.34
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mgcstack.go
10.55
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mgcsweep.go
14.79
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mgcsweepbuf.go
5.98
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mgcwork.go
14.24
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mheap.go
61.5
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mkduff.go
6.23
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mkfastlog2table.go
1.32
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mkpreempt.go
13.33
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mksizeclasses.go
8.62
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mmap.go
847
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mpagealloc.go
35.25
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mpagealloc_32bit.go
3.75
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mpagealloc_64bit.go
6.51
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mpagealloc_test.go
28.88
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mpagecache.go
5.03
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mpagecache_test.go
9.93
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mpallocbits.go
10.69
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mpallocbits_test.go
12.93
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mprof.go
24.06
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mranges.go
5.41
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msan.go
1.39
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msan0.go
647
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msan_amd64.s
2.03
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msan_arm64.s
1.69
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msize.go
785
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mstats.go
22.62
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mwbbuf.go
10.07
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nbpipe_fcntl_libc_test.go
463
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nbpipe_fcntl_unix_test.go
445
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nbpipe_pipe.go
411
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nbpipe_pipe2.go
509
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nbpipe_test.go
2.17
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net_plan9.go
645
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netpoll.go
14.46
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netpoll_aix.go
4.64
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netpoll_epoll.go
4
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netpoll_fake.go
648
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netpoll_kqueue.go
4.39
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netpoll_solaris.go
10.56
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netpoll_stub.go
1.3
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netpoll_windows.go
4.51
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norace_linux_test.go
888
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norace_test.go
979
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numcpu_freebsd_test.go
381
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os2_aix.go
20.67
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os2_freebsd.go
302
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os2_openbsd.go
296
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os2_plan9.go
1.48
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os2_solaris.go
320
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os3_plan9.go
3.99
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os3_solaris.go
16.92
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os_aix.go
8.29
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os_android.go
463
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os_darwin.go
10.59
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os_darwin_arm.go
749
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os_darwin_arm64.go
416
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os_dragonfly.go
6.2
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os_freebsd.go
10.97
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os_freebsd2.go
478
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os_freebsd_amd64.go
529
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os_freebsd_arm.go
1.32
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os_freebsd_arm64.go
2.97
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os_freebsd_noauxv.go
254
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os_illumos.go
3.93
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os_js.go
2.93
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os_linux.go
13.16
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os_linux_arm.go
1.35
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os_linux_arm64.go
1.02
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os_linux_be64.go
816
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os_linux_generic.go
916
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os_linux_mips64x.go
999
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os_linux_mipsx.go
1.05
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os_linux_noauxv.go
307
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os_linux_novdso.go
298
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os_linux_ppc64x.go
527
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os_linux_riscv64.go
198
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os_linux_s390x.go
455
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os_linux_x86.go
2.69
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os_netbsd.go
8.49
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os_netbsd_386.go
588
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os_netbsd_amd64.go
585
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os_netbsd_arm.go
1.13
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os_netbsd_arm64.go
827
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os_nonopenbsd.go
436
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os_only_solaris.go
356
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os_openbsd.go
7.81
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os_openbsd_arm.go
749
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os_openbsd_arm64.go
714
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os_plan9.go
9.3
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os_plan9_arm.go
462
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os_solaris.go
6.49
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os_windows.go
37.01
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os_windows_arm.go
511
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panic.go
42.23
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panic32.go
4.79
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plugin.go
4.16
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${this.title}
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Code Editor : string.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 ( "internal/bytealg" "unsafe" ) // The constant is known to the compiler. // There is no fundamental theory behind this number. const tmpStringBufSize = 32 type tmpBuf [tmpStringBufSize]byte // concatstrings implements a Go string concatenation x+y+z+... // The operands are passed in the slice a. // If buf != nil, the compiler has determined that the result does not // escape the calling function, so the string data can be stored in buf // if small enough. func concatstrings(buf *tmpBuf, a []string) string { idx := 0 l := 0 count := 0 for i, x := range a { n := len(x) if n == 0 { continue } if l+n < l { throw("string concatenation too long") } l += n count++ idx = i } if count == 0 { return "" } // If there is just one string and either it is not on the stack // or our result does not escape the calling frame (buf != nil), // then we can return that string directly. if count == 1 && (buf != nil || !stringDataOnStack(a[idx])) { return a[idx] } s, b := rawstringtmp(buf, l) for _, x := range a { copy(b, x) b = b[len(x):] } return s } func concatstring2(buf *tmpBuf, a [2]string) string { return concatstrings(buf, a[:]) } func concatstring3(buf *tmpBuf, a [3]string) string { return concatstrings(buf, a[:]) } func concatstring4(buf *tmpBuf, a [4]string) string { return concatstrings(buf, a[:]) } func concatstring5(buf *tmpBuf, a [5]string) string { return concatstrings(buf, a[:]) } // Buf is a fixed-size buffer for the result, // it is not nil if the result does not escape. func slicebytetostring(buf *tmpBuf, b []byte) (str string) { l := len(b) if l == 0 { // Turns out to be a relatively common case. // Consider that you want to parse out data between parens in "foo()bar", // you find the indices and convert the subslice to string. return "" } if raceenabled { racereadrangepc(unsafe.Pointer(&b[0]), uintptr(l), getcallerpc(), funcPC(slicebytetostring)) } if msanenabled { msanread(unsafe.Pointer(&b[0]), uintptr(l)) } if l == 1 { stringStructOf(&str).str = unsafe.Pointer(&staticbytes[b[0]]) stringStructOf(&str).len = 1 return } var p unsafe.Pointer if buf != nil && len(b) <= len(buf) { p = unsafe.Pointer(buf) } else { p = mallocgc(uintptr(len(b)), nil, false) } stringStructOf(&str).str = p stringStructOf(&str).len = len(b) memmove(p, (*(*slice)(unsafe.Pointer(&b))).array, uintptr(len(b))) return } // stringDataOnStack reports whether the string's data is // stored on the current goroutine's stack. func stringDataOnStack(s string) bool { ptr := uintptr(stringStructOf(&s).str) stk := getg().stack return stk.lo <= ptr && ptr < stk.hi } func rawstringtmp(buf *tmpBuf, l int) (s string, b []byte) { if buf != nil && l <= len(buf) { b = buf[:l] s = slicebytetostringtmp(b) } else { s, b = rawstring(l) } return } // slicebytetostringtmp returns a "string" referring to the actual []byte bytes. // // Callers need to ensure that the returned string will not be used after // the calling goroutine modifies the original slice or synchronizes with // another goroutine. // // The function is only called when instrumenting // and otherwise intrinsified by the compiler. // // Some internal compiler optimizations use this function. // - Used for m[T1{... Tn{..., string(k), ...} ...}] and m[string(k)] // where k is []byte, T1 to Tn is a nesting of struct and array literals. // - Used for "<"+string(b)+">" concatenation where b is []byte. // - Used for string(b)=="foo" comparison where b is []byte. func slicebytetostringtmp(b []byte) string { if raceenabled && len(b) > 0 { racereadrangepc(unsafe.Pointer(&b[0]), uintptr(len(b)), getcallerpc(), funcPC(slicebytetostringtmp)) } if msanenabled && len(b) > 0 { msanread(unsafe.Pointer(&b[0]), uintptr(len(b))) } return *(*string)(unsafe.Pointer(&b)) } func stringtoslicebyte(buf *tmpBuf, s string) []byte { var b []byte if buf != nil && len(s) <= len(buf) { *buf = tmpBuf{} b = buf[:len(s)] } else { b = rawbyteslice(len(s)) } copy(b, s) return b } func stringtoslicerune(buf *[tmpStringBufSize]rune, s string) []rune { // two passes. // unlike slicerunetostring, no race because strings are immutable. n := 0 for range s { n++ } var a []rune if buf != nil && n <= len(buf) { *buf = [tmpStringBufSize]rune{} a = buf[:n] } else { a = rawruneslice(n) } n = 0 for _, r := range s { a[n] = r n++ } return a } func slicerunetostring(buf *tmpBuf, a []rune) string { if raceenabled && len(a) > 0 { racereadrangepc(unsafe.Pointer(&a[0]), uintptr(len(a))*unsafe.Sizeof(a[0]), getcallerpc(), funcPC(slicerunetostring)) } if msanenabled && len(a) > 0 { msanread(unsafe.Pointer(&a[0]), uintptr(len(a))*unsafe.Sizeof(a[0])) } var dum [4]byte size1 := 0 for _, r := range a { size1 += encoderune(dum[:], r) } s, b := rawstringtmp(buf, size1+3) size2 := 0 for _, r := range a { // check for race if size2 >= size1 { break } size2 += encoderune(b[size2:], r) } return s[:size2] } type stringStruct struct { str unsafe.Pointer len int } // Variant with *byte pointer type for DWARF debugging. type stringStructDWARF struct { str *byte len int } func stringStructOf(sp *string) *stringStruct { return (*stringStruct)(unsafe.Pointer(sp)) } func intstring(buf *[4]byte, v int64) (s string) { if v >= 0 && v < runeSelf { stringStructOf(&s).str = unsafe.Pointer(&staticbytes[v]) stringStructOf(&s).len = 1 return } var b []byte if buf != nil { b = buf[:] s = slicebytetostringtmp(b) } else { s, b = rawstring(4) } if int64(rune(v)) != v { v = runeError } n := encoderune(b, rune(v)) return s[:n] } // rawstring allocates storage for a new string. The returned // string and byte slice both refer to the same storage. // The storage is not zeroed. Callers should use // b to set the string contents and then drop b. func rawstring(size int) (s string, b []byte) { p := mallocgc(uintptr(size), nil, false) stringStructOf(&s).str = p stringStructOf(&s).len = size *(*slice)(unsafe.Pointer(&b)) = slice{p, size, size} return } // rawbyteslice allocates a new byte slice. The byte slice is not zeroed. func rawbyteslice(size int) (b []byte) { cap := roundupsize(uintptr(size)) p := mallocgc(cap, nil, false) if cap != uintptr(size) { memclrNoHeapPointers(add(p, uintptr(size)), cap-uintptr(size)) } *(*slice)(unsafe.Pointer(&b)) = slice{p, size, int(cap)} return } // rawruneslice allocates a new rune slice. The rune slice is not zeroed. func rawruneslice(size int) (b []rune) { if uintptr(size) > maxAlloc/4 { throw("out of memory") } mem := roundupsize(uintptr(size) * 4) p := mallocgc(mem, nil, false) if mem != uintptr(size)*4 { memclrNoHeapPointers(add(p, uintptr(size)*4), mem-uintptr(size)*4) } *(*slice)(unsafe.Pointer(&b)) = slice{p, size, int(mem / 4)} return } // used by cmd/cgo func gobytes(p *byte, n int) (b []byte) { if n == 0 { return make([]byte, 0) } if n < 0 || uintptr(n) > maxAlloc { panic(errorString("gobytes: length out of range")) } bp := mallocgc(uintptr(n), nil, false) memmove(bp, unsafe.Pointer(p), uintptr(n)) *(*slice)(unsafe.Pointer(&b)) = slice{bp, n, n} return } // This is exported via linkname to assembly in syscall (for Plan9). //go:linkname gostring func gostring(p *byte) string { l := findnull(p) if l == 0 { return "" } s, b := rawstring(l) memmove(unsafe.Pointer(&b[0]), unsafe.Pointer(p), uintptr(l)) return s } func gostringn(p *byte, l int) string { if l == 0 { return "" } s, b := rawstring(l) memmove(unsafe.Pointer(&b[0]), unsafe.Pointer(p), uintptr(l)) return s } func index(s, t string) int { if len(t) == 0 { return 0 } for i := 0; i < len(s); i++ { if s[i] == t[0] && hasPrefix(s[i:], t) { return i } } return -1 } func contains(s, t string) bool { return index(s, t) >= 0 } func hasPrefix(s, prefix string) bool { return len(s) >= len(prefix) && s[:len(prefix)] == prefix } const ( maxUint = ^uint(0) maxInt = int(maxUint >> 1) ) // atoi parses an int from a string s. // The bool result reports whether s is a number // representable by a value of type int. func atoi(s string) (int, bool) { if s == "" { return 0, false } neg := false if s[0] == '-' { neg = true s = s[1:] } un := uint(0) for i := 0; i < len(s); i++ { c := s[i] if c < '0' || c > '9' { return 0, false } if un > maxUint/10 { // overflow return 0, false } un *= 10 un1 := un + uint(c) - '0' if un1 < un { // overflow return 0, false } un = un1 } if !neg && un > uint(maxInt) { return 0, false } if neg && un > uint(maxInt)+1 { return 0, false } n := int(un) if neg { n = -n } return n, true } // atoi32 is like atoi but for integers // that fit into an int32. func atoi32(s string) (int32, bool) { if n, ok := atoi(s); n == int(int32(n)) { return int32(n), ok } return 0, false } //go:nosplit func findnull(s *byte) int { if s == nil { return 0 } // Avoid IndexByteString on Plan 9 because it uses SSE instructions // on x86 machines, and those are classified as floating point instructions, // which are illegal in a note handler. if GOOS == "plan9" { p := (*[maxAlloc/2 - 1]byte)(unsafe.Pointer(s)) l := 0 for p[l] != 0 { l++ } return l } // pageSize is the unit we scan at a time looking for NULL. // It must be the minimum page size for any architecture Go // runs on. It's okay (just a minor performance loss) if the // actual system page size is larger than this value. const pageSize = 4096 offset := 0 ptr := unsafe.Pointer(s) // IndexByteString uses wide reads, so we need to be careful // with page boundaries. Call IndexByteString on // [ptr, endOfPage) interval. safeLen := int(pageSize - uintptr(ptr)%pageSize) for { t := *(*string)(unsafe.Pointer(&stringStruct{ptr, safeLen})) // Check one page at a time. if i := bytealg.IndexByteString(t, 0); i != -1 { return offset + i } // Move to next page ptr = unsafe.Pointer(uintptr(ptr) + uintptr(safeLen)) offset += safeLen safeLen = pageSize } } func findnullw(s *uint16) int { if s == nil { return 0 } p := (*[maxAlloc/2/2 - 1]uint16)(unsafe.Pointer(s)) l := 0 for p[l] != 0 { l++ } return l } //go:nosplit func gostringnocopy(str *byte) string { ss := stringStruct{str: unsafe.Pointer(str), len: findnull(str)} s := *(*string)(unsafe.Pointer(&ss)) return s } func gostringw(strw *uint16) string { var buf [8]byte str := (*[maxAlloc/2/2 - 1]uint16)(unsafe.Pointer(strw)) n1 := 0 for i := 0; str[i] != 0; i++ { n1 += encoderune(buf[:], rune(str[i])) } s, b := rawstring(n1 + 4) n2 := 0 for i := 0; str[i] != 0; i++ { // check for race if n2 >= n1 { break } n2 += encoderune(b[n2:], rune(str[i])) } b[n2] = 0 // for luck return s[:n2] } // parseRelease parses a dot-separated version number. It follows the // semver syntax, but allows the minor and patch versions to be // elided. func parseRelease(rel string) (major, minor, patch int, ok bool) { // Strip anything after a dash or plus. for i := 0; i < len(rel); i++ { if rel[i] == '-' || rel[i] == '+' { rel = rel[:i] break } } next := func() (int, bool) { for i := 0; i < len(rel); i++ { if rel[i] == '.' { ver, ok := atoi(rel[:i]) rel = rel[i+1:] return ver, ok } } ver, ok := atoi(rel) rel = "" return ver, ok } if major, ok = next(); !ok || rel == "" { return } if minor, ok = next(); !ok || rel == "" { return } patch, ok = next() return }
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