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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: pinner.go
// Copyright 2023 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package runtime import ( "runtime/internal/atomic" "unsafe" ) // A Pinner is a set of Go objects each pinned to a fixed location in memory. The // [Pinner.Pin] method pins one object, while [Pinner.Unpin] unpins all pinned // objects. See their comments for more information. type Pinner struct { *pinner } // Pin pins a Go object, preventing it from being moved or freed by the garbage // collector until the [Pinner.Unpin] method has been called. // // A pointer to a pinned object can be directly stored in C memory or can be // contained in Go memory passed to C functions. If the pinned object itself // contains pointers to Go objects, these objects must be pinned separately if they // are going to be accessed from C code. // // The argument must be a pointer of any type or an [unsafe.Pointer]. // It's safe to call Pin on non-Go pointers, in which case Pin will do nothing. func (p *Pinner) Pin(pointer any) { if p.pinner == nil { // Check the pinner cache first. mp := acquirem() if pp := mp.p.ptr(); pp != nil { p.pinner = pp.pinnerCache pp.pinnerCache = nil } releasem(mp) if p.pinner == nil { // Didn't get anything from the pinner cache. p.pinner = new(pinner) p.refs = p.refStore[:0] // We set this finalizer once and never clear it. Thus, if the // pinner gets cached, we'll reuse it, along with its finalizer. // This lets us avoid the relatively expensive SetFinalizer call // when reusing from the cache. The finalizer however has to be // resilient to an empty pinner being finalized, which is done // by checking p.refs' length. SetFinalizer(p.pinner, func(i *pinner) { if len(i.refs) != 0 { i.unpin() // only required to make the test idempotent pinnerLeakPanic() } }) } } ptr := pinnerGetPtr(&pointer) if setPinned(ptr, true) { p.refs = append(p.refs, ptr) } } // Unpin unpins all pinned objects of the [Pinner]. func (p *Pinner) Unpin() { p.pinner.unpin() mp := acquirem() if pp := mp.p.ptr(); pp != nil && pp.pinnerCache == nil { // Put the pinner back in the cache, but only if the // cache is empty. If application code is reusing Pinners // on its own, we want to leave the backing store in place // so reuse is more efficient. pp.pinnerCache = p.pinner p.pinner = nil } releasem(mp) } const ( pinnerSize = 64 pinnerRefStoreSize = (pinnerSize - unsafe.Sizeof([]unsafe.Pointer{})) / unsafe.Sizeof(unsafe.Pointer(nil)) ) type pinner struct { refs []unsafe.Pointer refStore [pinnerRefStoreSize]unsafe.Pointer } func (p *pinner) unpin() { if p == nil || p.refs == nil { return } for i := range p.refs { setPinned(p.refs[i], false) } // The following two lines make all pointers to references // in p.refs unreachable, either by deleting them or dropping // p.refs' backing store (if it was not backed by refStore). p.refStore = [pinnerRefStoreSize]unsafe.Pointer{} p.refs = p.refStore[:0] } func pinnerGetPtr(i *any) unsafe.Pointer { e := efaceOf(i) etyp := e._type if etyp == nil { panic(errorString("runtime.Pinner: argument is nil")) } if kind := etyp.Kind_ & kindMask; kind != kindPtr && kind != kindUnsafePointer { panic(errorString("runtime.Pinner: argument is not a pointer: " + toRType(etyp).string())) } if inUserArenaChunk(uintptr(e.data)) { // Arena-allocated objects are not eligible for pinning. panic(errorString("runtime.Pinner: object was allocated into an arena")) } return e.data } // isPinned checks if a Go pointer is pinned. // nosplit, because it's called from nosplit code in cgocheck. // //go:nosplit func isPinned(ptr unsafe.Pointer) bool { span := spanOfHeap(uintptr(ptr)) if span == nil { // this code is only called for Go pointer, so this must be a // linker-allocated global object. return true } pinnerBits := span.getPinnerBits() // these pinnerBits might get unlinked by a concurrently running sweep, but // that's OK because gcBits don't get cleared until the following GC cycle // (nextMarkBitArenaEpoch) if pinnerBits == nil { return false } objIndex := span.objIndex(uintptr(ptr)) pinState := pinnerBits.ofObject(objIndex) KeepAlive(ptr) // make sure ptr is alive until we are done so the span can't be freed return pinState.isPinned() } // setPinned marks or unmarks a Go pointer as pinned, when the ptr is a Go pointer. // It will be ignored while try to pin a non-Go pointer, // and it will be panic while try to unpin a non-Go pointer, // which should not happen in normal usage. func setPinned(ptr unsafe.Pointer, pin bool) bool { span := spanOfHeap(uintptr(ptr)) if span == nil { if !pin { panic(errorString("tried to unpin non-Go pointer")) } // This is a linker-allocated, zero size object or other object, // nothing to do, silently ignore it. return false } // ensure that the span is swept, b/c sweeping accesses the specials list // w/o locks. mp := acquirem() span.ensureSwept() KeepAlive(ptr) // make sure ptr is still alive after span is swept objIndex := span.objIndex(uintptr(ptr)) lock(&span.speciallock) // guard against concurrent calls of setPinned on same span pinnerBits := span.getPinnerBits() if pinnerBits == nil { pinnerBits = span.newPinnerBits() span.setPinnerBits(pinnerBits) } pinState := pinnerBits.ofObject(objIndex) if pin { if pinState.isPinned() { // multiple pins on same object, set multipin bit pinState.setMultiPinned(true) // and increase the pin counter // TODO(mknyszek): investigate if systemstack is necessary here systemstack(func() { offset := objIndex * span.elemsize span.incPinCounter(offset) }) } else { // set pin bit pinState.setPinned(true) } } else { // unpin if pinState.isPinned() { if pinState.isMultiPinned() { var exists bool // TODO(mknyszek): investigate if systemstack is necessary here systemstack(func() { offset := objIndex * span.elemsize exists = span.decPinCounter(offset) }) if !exists { // counter is 0, clear multipin bit pinState.setMultiPinned(false) } } else { // no multipins recorded. unpin object. pinState.setPinned(false) } } else { // unpinning unpinned object, bail out throw("runtime.Pinner: object already unpinned") } } unlock(&span.speciallock) releasem(mp) return true } type pinState struct { bytep *uint8 byteVal uint8 mask uint8 } // nosplit, because it's called by isPinned, which is nosplit // //go:nosplit func (v *pinState) isPinned() bool { return (v.byteVal & v.mask) != 0 } func (v *pinState) isMultiPinned() bool { return (v.byteVal & (v.mask << 1)) != 0 } func (v *pinState) setPinned(val bool) { v.set(val, false) } func (v *pinState) setMultiPinned(val bool) { v.set(val, true) } // set sets the pin bit of the pinState to val. If multipin is true, it // sets/unsets the multipin bit instead. func (v *pinState) set(val bool, multipin bool) { mask := v.mask if multipin { mask <<= 1 } if val { atomic.Or8(v.bytep, mask) } else { atomic.And8(v.bytep, ^mask) } } // pinnerBits is the same type as gcBits but has different methods. type pinnerBits gcBits // ofObject returns the pinState of the n'th object. // nosplit, because it's called by isPinned, which is nosplit // //go:nosplit func (p *pinnerBits) ofObject(n uintptr) pinState { bytep, mask := (*gcBits)(p).bitp(n * 2) byteVal := atomic.Load8(bytep) return pinState{bytep, byteVal, mask} } func (s *mspan) pinnerBitSize() uintptr { return divRoundUp(uintptr(s.nelems)*2, 8) } // newPinnerBits returns a pointer to 8 byte aligned bytes to be used for this // span's pinner bits. newPinneBits is used to mark objects that are pinned. // They are copied when the span is swept. func (s *mspan) newPinnerBits() *pinnerBits { return (*pinnerBits)(newMarkBits(uintptr(s.nelems) * 2)) } // nosplit, because it's called by isPinned, which is nosplit // //go:nosplit func (s *mspan) getPinnerBits() *pinnerBits { return (*pinnerBits)(atomic.Loadp(unsafe.Pointer(&s.pinnerBits))) } func (s *mspan) setPinnerBits(p *pinnerBits) { atomicstorep(unsafe.Pointer(&s.pinnerBits), unsafe.Pointer(p)) } // refreshPinnerBits replaces pinnerBits with a fresh copy in the arenas for the // next GC cycle. If it does not contain any pinned objects, pinnerBits of the // span is set to nil. func (s *mspan) refreshPinnerBits() { p := s.getPinnerBits() if p == nil { return } hasPins := false bytes := alignUp(s.pinnerBitSize(), 8) // Iterate over each 8-byte chunk and check for pins. Note that // newPinnerBits guarantees that pinnerBits will be 8-byte aligned, so we // don't have to worry about edge cases, irrelevant bits will simply be // zero. for _, x := range unsafe.Slice((*uint64)(unsafe.Pointer(&p.x)), bytes/8) { if x != 0 { hasPins = true break } } if hasPins { newPinnerBits := s.newPinnerBits() memmove(unsafe.Pointer(&newPinnerBits.x), unsafe.Pointer(&p.x), bytes) s.setPinnerBits(newPinnerBits) } else { s.setPinnerBits(nil) } } // incPinCounter is only called for multiple pins of the same object and records // the _additional_ pins. func (span *mspan) incPinCounter(offset uintptr) { var rec *specialPinCounter ref, exists := span.specialFindSplicePoint(offset, _KindSpecialPinCounter) if !exists { lock(&mheap_.speciallock) rec = (*specialPinCounter)(mheap_.specialPinCounterAlloc.alloc()) unlock(&mheap_.speciallock) // splice in record, fill in offset. rec.special.offset = uint16(offset) rec.special.kind = _KindSpecialPinCounter rec.special.next = *ref *ref = (*special)(unsafe.Pointer(rec)) spanHasSpecials(span) } else { rec = (*specialPinCounter)(unsafe.Pointer(*ref)) } rec.counter++ } // decPinCounter decreases the counter. If the counter reaches 0, the counter // special is deleted and false is returned. Otherwise true is returned. func (span *mspan) decPinCounter(offset uintptr) bool { ref, exists := span.specialFindSplicePoint(offset, _KindSpecialPinCounter) if !exists { throw("runtime.Pinner: decreased non-existing pin counter") } counter := (*specialPinCounter)(unsafe.Pointer(*ref)) counter.counter-- if counter.counter == 0 { *ref = counter.special.next if span.specials == nil { spanHasNoSpecials(span) } lock(&mheap_.speciallock) mheap_.specialPinCounterAlloc.free(unsafe.Pointer(counter)) unlock(&mheap_.speciallock) return false } return true } // only for tests func pinnerGetPinCounter(addr unsafe.Pointer) *uintptr { _, span, objIndex := findObject(uintptr(addr), 0, 0) offset := objIndex * span.elemsize t, exists := span.specialFindSplicePoint(offset, _KindSpecialPinCounter) if !exists { return nil } counter := (*specialPinCounter)(unsafe.Pointer(*t)) return &counter.counter } // to be able to test that the GC panics when a pinned pointer is leaking, this // panic function is a variable, that can be overwritten by a test. var pinnerLeakPanic = func() { panic(errorString("runtime.Pinner: found leaking pinned pointer; forgot to call Unpin()?")) }
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