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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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Code Editor : cgocall.go
// Copyright 2009 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. // Cgo call and callback support. // // To call into the C function f from Go, the cgo-generated code calls // runtime.cgocall(_cgo_Cfunc_f, frame), where _cgo_Cfunc_f is a // gcc-compiled function written by cgo. // // runtime.cgocall (below) calls entersyscall so as not to block // other goroutines or the garbage collector, and then calls // runtime.asmcgocall(_cgo_Cfunc_f, frame). // // runtime.asmcgocall (in asm_$GOARCH.s) switches to the m->g0 stack // (assumed to be an operating system-allocated stack, so safe to run // gcc-compiled code on) and calls _cgo_Cfunc_f(frame). // // _cgo_Cfunc_f invokes the actual C function f with arguments // taken from the frame structure, records the results in the frame, // and returns to runtime.asmcgocall. // // After it regains control, runtime.asmcgocall switches back to the // original g (m->curg)'s stack and returns to runtime.cgocall. // // After it regains control, runtime.cgocall calls exitsyscall, which blocks // until this m can run Go code without violating the $GOMAXPROCS limit, // and then unlocks g from m. // // The above description skipped over the possibility of the gcc-compiled // function f calling back into Go. If that happens, we continue down // the rabbit hole during the execution of f. // // To make it possible for gcc-compiled C code to call a Go function p.GoF, // cgo writes a gcc-compiled function named GoF (not p.GoF, since gcc doesn't // know about packages). The gcc-compiled C function f calls GoF. // // GoF calls crosscall2(_cgoexp_GoF, frame, framesize). Crosscall2 // (in cgo/gcc_$GOARCH.S, a gcc-compiled assembly file) is a two-argument // adapter from the gcc function call ABI to the 6c function call ABI. // It is called from gcc to call 6c functions. In this case it calls // _cgoexp_GoF(frame, framesize), still running on m->g0's stack // and outside the $GOMAXPROCS limit. Thus, this code cannot yet // call arbitrary Go code directly and must be careful not to allocate // memory or use up m->g0's stack. // // _cgoexp_GoF calls runtime.cgocallback(p.GoF, frame, framesize, ctxt). // (The reason for having _cgoexp_GoF instead of writing a crosscall3 // to make this call directly is that _cgoexp_GoF, because it is compiled // with 6c instead of gcc, can refer to dotted names like // runtime.cgocallback and p.GoF.) // // runtime.cgocallback (in asm_$GOARCH.s) switches from m->g0's // stack to the original g (m->curg)'s stack, on which it calls // runtime.cgocallbackg(p.GoF, frame, framesize). // As part of the stack switch, runtime.cgocallback saves the current // SP as m->g0->sched.sp, so that any use of m->g0's stack during the // execution of the callback will be done below the existing stack frames. // Before overwriting m->g0->sched.sp, it pushes the old value on the // m->g0 stack, so that it can be restored later. // // runtime.cgocallbackg (below) is now running on a real goroutine // stack (not an m->g0 stack). First it calls runtime.exitsyscall, which will // block until the $GOMAXPROCS limit allows running this goroutine. // Once exitsyscall has returned, it is safe to do things like call the memory // allocator or invoke the Go callback function p.GoF. runtime.cgocallbackg // first defers a function to unwind m->g0.sched.sp, so that if p.GoF // panics, m->g0.sched.sp will be restored to its old value: the m->g0 stack // and the m->curg stack will be unwound in lock step. // Then it calls p.GoF. Finally it pops but does not execute the deferred // function, calls runtime.entersyscall, and returns to runtime.cgocallback. // // After it regains control, runtime.cgocallback switches back to // m->g0's stack (the pointer is still in m->g0.sched.sp), restores the old // m->g0.sched.sp value from the stack, and returns to _cgoexp_GoF. // // _cgoexp_GoF immediately returns to crosscall2, which restores the // callee-save registers for gcc and returns to GoF, which returns to f. package runtime import ( "runtime/internal/atomic" "runtime/internal/sys" "unsafe" ) // Addresses collected in a cgo backtrace when crashing. // Length must match arg.Max in x_cgo_callers in runtime/cgo/gcc_traceback.c. type cgoCallers [32]uintptr // Call from Go to C. // // This must be nosplit because it's used for syscalls on some // platforms. Syscalls may have untyped arguments on the stack, so // it's not safe to grow or scan the stack. // //go:nosplit func cgocall(fn, arg unsafe.Pointer) int32 { if !iscgo && GOOS != "solaris" && GOOS != "illumos" && GOOS != "windows" { throw("cgocall unavailable") } if fn == nil { throw("cgocall nil") } if raceenabled { racereleasemerge(unsafe.Pointer(&racecgosync)) } mp := getg().m mp.ncgocall++ mp.ncgo++ // Reset traceback. mp.cgoCallers[0] = 0 // Announce we are entering a system call // so that the scheduler knows to create another // M to run goroutines while we are in the // foreign code. // // The call to asmcgocall is guaranteed not to // grow the stack and does not allocate memory, // so it is safe to call while "in a system call", outside // the $GOMAXPROCS accounting. // // fn may call back into Go code, in which case we'll exit the // "system call", run the Go code (which may grow the stack), // and then re-enter the "system call" reusing the PC and SP // saved by entersyscall here. entersyscall() // Tell asynchronous preemption that we're entering external // code. We do this after entersyscall because this may block // and cause an async preemption to fail, but at this point a // sync preemption will succeed (though this is not a matter // of correctness). osPreemptExtEnter(mp) mp.incgo = true errno := asmcgocall(fn, arg) // Update accounting before exitsyscall because exitsyscall may // reschedule us on to a different M. mp.incgo = false mp.ncgo-- osPreemptExtExit(mp) exitsyscall() // Note that raceacquire must be called only after exitsyscall has // wired this M to a P. if raceenabled { raceacquire(unsafe.Pointer(&racecgosync)) } // From the garbage collector's perspective, time can move // backwards in the sequence above. If there's a callback into // Go code, GC will see this function at the call to // asmcgocall. When the Go call later returns to C, the // syscall PC/SP is rolled back and the GC sees this function // back at the call to entersyscall. Normally, fn and arg // would be live at entersyscall and dead at asmcgocall, so if // time moved backwards, GC would see these arguments as dead // and then live. Prevent these undead arguments from crashing // GC by forcing them to stay live across this time warp. KeepAlive(fn) KeepAlive(arg) KeepAlive(mp) return errno } // Call from C back to Go. //go:nosplit func cgocallbackg(ctxt uintptr) { gp := getg() if gp != gp.m.curg { println("runtime: bad g in cgocallback") exit(2) } // The call from C is on gp.m's g0 stack, so we must ensure // that we stay on that M. We have to do this before calling // exitsyscall, since it would otherwise be free to move us to // a different M. The call to unlockOSThread is in unwindm. lockOSThread() // Save current syscall parameters, so m.syscall can be // used again if callback decide to make syscall. syscall := gp.m.syscall // entersyscall saves the caller's SP to allow the GC to trace the Go // stack. However, since we're returning to an earlier stack frame and // need to pair with the entersyscall() call made by cgocall, we must // save syscall* and let reentersyscall restore them. savedsp := unsafe.Pointer(gp.syscallsp) savedpc := gp.syscallpc exitsyscall() // coming out of cgo call gp.m.incgo = false osPreemptExtExit(gp.m) cgocallbackg1(ctxt) // At this point unlockOSThread has been called. // The following code must not change to a different m. // This is enforced by checking incgo in the schedule function. osPreemptExtEnter(gp.m) gp.m.incgo = true // going back to cgo call reentersyscall(savedpc, uintptr(savedsp)) gp.m.syscall = syscall } func cgocallbackg1(ctxt uintptr) { gp := getg() if gp.m.needextram || atomic.Load(&extraMWaiters) > 0 { gp.m.needextram = false systemstack(newextram) } if ctxt != 0 { s := append(gp.cgoCtxt, ctxt) // Now we need to set gp.cgoCtxt = s, but we could get // a SIGPROF signal while manipulating the slice, and // the SIGPROF handler could pick up gp.cgoCtxt while // tracing up the stack. We need to ensure that the // handler always sees a valid slice, so set the // values in an order such that it always does. p := (*slice)(unsafe.Pointer(&gp.cgoCtxt)) atomicstorep(unsafe.Pointer(&p.array), unsafe.Pointer(&s[0])) p.cap = cap(s) p.len = len(s) defer func(gp *g) { // Decrease the length of the slice by one, safely. p := (*slice)(unsafe.Pointer(&gp.cgoCtxt)) p.len-- }(gp) } if gp.m.ncgo == 0 { // The C call to Go came from a thread not currently running // any Go. In the case of -buildmode=c-archive or c-shared, // this call may be coming in before package initialization // is complete. Wait until it is. <-main_init_done } // Add entry to defer stack in case of panic. restore := true defer unwindm(&restore) if raceenabled { raceacquire(unsafe.Pointer(&racecgosync)) } type args struct { fn *funcval arg unsafe.Pointer argsize uintptr } var cb *args // Location of callback arguments depends on stack frame layout // and size of stack frame of cgocallback_gofunc. sp := gp.m.g0.sched.sp switch GOARCH { default: throw("cgocallbackg is unimplemented on arch") case "arm": // On arm, stack frame is two words and there's a saved LR between // SP and the stack frame and between the stack frame and the arguments. cb = (*args)(unsafe.Pointer(sp + 4*sys.PtrSize)) case "arm64": // On arm64, stack frame is four words and there's a saved LR between // SP and the stack frame and between the stack frame and the arguments. // Additional two words (16-byte alignment) are for saving FP. cb = (*args)(unsafe.Pointer(sp + 7*sys.PtrSize)) case "amd64": // On amd64, stack frame is two words, plus caller PC. if framepointer_enabled { // In this case, there's also saved BP. cb = (*args)(unsafe.Pointer(sp + 4*sys.PtrSize)) break } cb = (*args)(unsafe.Pointer(sp + 3*sys.PtrSize)) case "386": // On 386, stack frame is three words, plus caller PC. cb = (*args)(unsafe.Pointer(sp + 4*sys.PtrSize)) case "ppc64", "ppc64le", "s390x": // On ppc64 and s390x, the callback arguments are in the arguments area of // cgocallback's stack frame. The stack looks like this: // +--------------------+------------------------------+ // | | ... | // | cgoexp_$fn +------------------------------+ // | | fixed frame area | // +--------------------+------------------------------+ // | | arguments area | // | cgocallback +------------------------------+ <- sp + 2*minFrameSize + 2*ptrSize // | | fixed frame area | // +--------------------+------------------------------+ <- sp + minFrameSize + 2*ptrSize // | | local variables (2 pointers) | // | cgocallback_gofunc +------------------------------+ <- sp + minFrameSize // | | fixed frame area | // +--------------------+------------------------------+ <- sp cb = (*args)(unsafe.Pointer(sp + 2*sys.MinFrameSize + 2*sys.PtrSize)) case "mips64", "mips64le": // On mips64x, stack frame is two words and there's a saved LR between // SP and the stack frame and between the stack frame and the arguments. cb = (*args)(unsafe.Pointer(sp + 4*sys.PtrSize)) case "mips", "mipsle": // On mipsx, stack frame is two words and there's a saved LR between // SP and the stack frame and between the stack frame and the arguments. cb = (*args)(unsafe.Pointer(sp + 4*sys.PtrSize)) } // Invoke callback. // NOTE(rsc): passing nil for argtype means that the copying of the // results back into cb.arg happens without any corresponding write barriers. // For cgo, cb.arg points into a C stack frame and therefore doesn't // hold any pointers that the GC can find anyway - the write barrier // would be a no-op. reflectcall(nil, unsafe.Pointer(cb.fn), cb.arg, uint32(cb.argsize), 0) if raceenabled { racereleasemerge(unsafe.Pointer(&racecgosync)) } if msanenabled { // Tell msan that we wrote to the entire argument block. // This tells msan that we set the results. // Since we have already called the function it doesn't // matter that we are writing to the non-result parameters. msanwrite(cb.arg, cb.argsize) } // Do not unwind m->g0->sched.sp. // Our caller, cgocallback, will do that. restore = false } func unwindm(restore *bool) { if *restore { // Restore sp saved by cgocallback during // unwind of g's stack (see comment at top of file). mp := acquirem() sched := &mp.g0.sched switch GOARCH { default: throw("unwindm not implemented") case "386", "amd64", "arm", "ppc64", "ppc64le", "mips64", "mips64le", "s390x", "mips", "mipsle": sched.sp = *(*uintptr)(unsafe.Pointer(sched.sp + sys.MinFrameSize)) case "arm64": sched.sp = *(*uintptr)(unsafe.Pointer(sched.sp + 16)) } // Do the accounting that cgocall will not have a chance to do // during an unwind. // // In the case where a Go call originates from C, ncgo is 0 // and there is no matching cgocall to end. if mp.ncgo > 0 { mp.incgo = false mp.ncgo-- osPreemptExtExit(mp) } releasem(mp) } // Undo the call to lockOSThread in cgocallbackg. // We must still stay on the same m. unlockOSThread() } // called from assembly func badcgocallback() { throw("misaligned stack in cgocallback") } // called from (incomplete) assembly func cgounimpl() { throw("cgo not implemented") } var racecgosync uint64 // represents possible synchronization in C code // Pointer checking for cgo code. // We want to detect all cases where a program that does not use // unsafe makes a cgo call passing a Go pointer to memory that // contains a Go pointer. Here a Go pointer is defined as a pointer // to memory allocated by the Go runtime. Programs that use unsafe // can evade this restriction easily, so we don't try to catch them. // The cgo program will rewrite all possibly bad pointer arguments to // call cgoCheckPointer, where we can catch cases of a Go pointer // pointing to a Go pointer. // Complicating matters, taking the address of a slice or array // element permits the C program to access all elements of the slice // or array. In that case we will see a pointer to a single element, // but we need to check the entire data structure. // The cgoCheckPointer call takes additional arguments indicating that // it was called on an address expression. An additional argument of // true means that it only needs to check a single element. An // additional argument of a slice or array means that it needs to // check the entire slice/array, but nothing else. Otherwise, the // pointer could be anything, and we check the entire heap object, // which is conservative but safe. // When and if we implement a moving garbage collector, // cgoCheckPointer will pin the pointer for the duration of the cgo // call. (This is necessary but not sufficient; the cgo program will // also have to change to pin Go pointers that cannot point to Go // pointers.) // cgoCheckPointer checks if the argument contains a Go pointer that // points to a Go pointer, and panics if it does. func cgoCheckPointer(ptr interface{}, arg interface{}) { if debug.cgocheck == 0 { return } ep := efaceOf(&ptr) t := ep._type top := true if arg != nil && (t.kind&kindMask == kindPtr || t.kind&kindMask == kindUnsafePointer) { p := ep.data if t.kind&kindDirectIface == 0 { p = *(*unsafe.Pointer)(p) } if p == nil || !cgoIsGoPointer(p) { return } aep := efaceOf(&arg) switch aep._type.kind & kindMask { case kindBool: if t.kind&kindMask == kindUnsafePointer { // We don't know the type of the element. break } pt := (*ptrtype)(unsafe.Pointer(t)) cgoCheckArg(pt.elem, p, true, false, cgoCheckPointerFail) return case kindSlice: // Check the slice rather than the pointer. ep = aep t = ep._type case kindArray: // Check the array rather than the pointer. // Pass top as false since we have a pointer // to the array. ep = aep t = ep._type top = false default: throw("can't happen") } } cgoCheckArg(t, ep.data, t.kind&kindDirectIface == 0, top, cgoCheckPointerFail) } const cgoCheckPointerFail = "cgo argument has Go pointer to Go pointer" const cgoResultFail = "cgo result has Go pointer" // cgoCheckArg is the real work of cgoCheckPointer. The argument p // is either a pointer to the value (of type t), or the value itself, // depending on indir. The top parameter is whether we are at the top // level, where Go pointers are allowed. func cgoCheckArg(t *_type, p unsafe.Pointer, indir, top bool, msg string) { if t.ptrdata == 0 || p == nil { // If the type has no pointers there is nothing to do. return } switch t.kind & kindMask { default: throw("can't happen") case kindArray: at := (*arraytype)(unsafe.Pointer(t)) if !indir { if at.len != 1 { throw("can't happen") } cgoCheckArg(at.elem, p, at.elem.kind&kindDirectIface == 0, top, msg) return } for i := uintptr(0); i < at.len; i++ { cgoCheckArg(at.elem, p, true, top, msg) p = add(p, at.elem.size) } case kindChan, kindMap: // These types contain internal pointers that will // always be allocated in the Go heap. It's never OK // to pass them to C. panic(errorString(msg)) case kindFunc: if indir { p = *(*unsafe.Pointer)(p) } if !cgoIsGoPointer(p) { return } panic(errorString(msg)) case kindInterface: it := *(**_type)(p) if it == nil { return } // A type known at compile time is OK since it's // constant. A type not known at compile time will be // in the heap and will not be OK. if inheap(uintptr(unsafe.Pointer(it))) { panic(errorString(msg)) } p = *(*unsafe.Pointer)(add(p, sys.PtrSize)) if !cgoIsGoPointer(p) { return } if !top { panic(errorString(msg)) } cgoCheckArg(it, p, it.kind&kindDirectIface == 0, false, msg) case kindSlice: st := (*slicetype)(unsafe.Pointer(t)) s := (*slice)(p) p = s.array if p == nil || !cgoIsGoPointer(p) { return } if !top { panic(errorString(msg)) } if st.elem.ptrdata == 0 { return } for i := 0; i < s.cap; i++ { cgoCheckArg(st.elem, p, true, false, msg) p = add(p, st.elem.size) } case kindString: ss := (*stringStruct)(p) if !cgoIsGoPointer(ss.str) { return } if !top { panic(errorString(msg)) } case kindStruct: st := (*structtype)(unsafe.Pointer(t)) if !indir { if len(st.fields) != 1 { throw("can't happen") } cgoCheckArg(st.fields[0].typ, p, st.fields[0].typ.kind&kindDirectIface == 0, top, msg) return } for _, f := range st.fields { if f.typ.ptrdata == 0 { continue } cgoCheckArg(f.typ, add(p, f.offset()), true, top, msg) } case kindPtr, kindUnsafePointer: if indir { p = *(*unsafe.Pointer)(p) if p == nil { return } } if !cgoIsGoPointer(p) { return } if !top { panic(errorString(msg)) } cgoCheckUnknownPointer(p, msg) } } // cgoCheckUnknownPointer is called for an arbitrary pointer into Go // memory. It checks whether that Go memory contains any other // pointer into Go memory. If it does, we panic. // The return values are unused but useful to see in panic tracebacks. func cgoCheckUnknownPointer(p unsafe.Pointer, msg string) (base, i uintptr) { if inheap(uintptr(p)) { b, span, _ := findObject(uintptr(p), 0, 0) base = b if base == 0 { return } hbits := heapBitsForAddr(base) n := span.elemsize for i = uintptr(0); i < n; i += sys.PtrSize { if i != 1*sys.PtrSize && !hbits.morePointers() { // No more possible pointers. break } if hbits.isPointer() && cgoIsGoPointer(*(*unsafe.Pointer)(unsafe.Pointer(base + i))) { panic(errorString(msg)) } hbits = hbits.next() } return } for _, datap := range activeModules() { if cgoInRange(p, datap.data, datap.edata) || cgoInRange(p, datap.bss, datap.ebss) { // We have no way to know the size of the object. // We have to assume that it might contain a pointer. panic(errorString(msg)) } // In the text or noptr sections, we know that the // pointer does not point to a Go pointer. } return } // cgoIsGoPointer reports whether the pointer is a Go pointer--a // pointer to Go memory. We only care about Go memory that might // contain pointers. //go:nosplit //go:nowritebarrierrec func cgoIsGoPointer(p unsafe.Pointer) bool { if p == nil { return false } if inHeapOrStack(uintptr(p)) { return true } for _, datap := range activeModules() { if cgoInRange(p, datap.data, datap.edata) || cgoInRange(p, datap.bss, datap.ebss) { return true } } return false } // cgoInRange reports whether p is between start and end. //go:nosplit //go:nowritebarrierrec func cgoInRange(p unsafe.Pointer, start, end uintptr) bool { return start <= uintptr(p) && uintptr(p) < end } // cgoCheckResult is called to check the result parameter of an // exported Go function. It panics if the result is or contains a Go // pointer. func cgoCheckResult(val interface{}) { if debug.cgocheck == 0 { return } ep := efaceOf(&val) t := ep._type cgoCheckArg(t, ep.data, t.kind&kindDirectIface == 0, false, cgoResultFail) }
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