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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: stack_test.go
// Copyright 2012 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_test import ( "fmt" "internal/testenv" "reflect" "regexp" . "runtime" "strings" "sync" "sync/atomic" "testing" "time" _ "unsafe" // for go:linkname ) // TestStackMem measures per-thread stack segment cache behavior. // The test consumed up to 500MB in the past. func TestStackMem(t *testing.T) { const ( BatchSize = 32 BatchCount = 256 ArraySize = 1024 RecursionDepth = 128 ) if testing.Short() { return } defer GOMAXPROCS(GOMAXPROCS(BatchSize)) s0 := new(MemStats) ReadMemStats(s0) for b := 0; b < BatchCount; b++ { c := make(chan bool, BatchSize) for i := 0; i < BatchSize; i++ { go func() { var f func(k int, a [ArraySize]byte) f = func(k int, a [ArraySize]byte) { if k == 0 { time.Sleep(time.Millisecond) return } f(k-1, a) } f(RecursionDepth, [ArraySize]byte{}) c <- true }() } for i := 0; i < BatchSize; i++ { <-c } // The goroutines have signaled via c that they are ready to exit. // Give them a chance to exit by sleeping. If we don't wait, we // might not reuse them on the next batch. time.Sleep(10 * time.Millisecond) } s1 := new(MemStats) ReadMemStats(s1) consumed := int64(s1.StackSys - s0.StackSys) t.Logf("Consumed %vMB for stack mem", consumed>>20) estimate := int64(8 * BatchSize * ArraySize * RecursionDepth) // 8 is to reduce flakiness. if consumed > estimate { t.Fatalf("Stack mem: want %v, got %v", estimate, consumed) } // Due to broken stack memory accounting (https://golang.org/issue/7468), // StackInuse can decrease during function execution, so we cast the values to int64. inuse := int64(s1.StackInuse) - int64(s0.StackInuse) t.Logf("Inuse %vMB for stack mem", inuse>>20) if inuse > 4<<20 { t.Fatalf("Stack inuse: want %v, got %v", 4<<20, inuse) } } // Test stack growing in different contexts. func TestStackGrowth(t *testing.T) { if *flagQuick { t.Skip("-quick") } var wg sync.WaitGroup // in a normal goroutine var growDuration time.Duration // For debugging failures wg.Add(1) go func() { defer wg.Done() start := time.Now() growStack(nil) growDuration = time.Since(start) }() wg.Wait() t.Log("first growStack took", growDuration) // in locked goroutine wg.Add(1) go func() { defer wg.Done() LockOSThread() growStack(nil) UnlockOSThread() }() wg.Wait() // in finalizer var finalizerStart time.Time var started atomic.Bool var progress atomic.Uint32 wg.Add(1) s := new(string) // Must be of a type that avoids the tiny allocator, or else the finalizer might not run. SetFinalizer(s, func(ss *string) { defer wg.Done() finalizerStart = time.Now() started.Store(true) growStack(&progress) }) setFinalizerTime := time.Now() s = nil if d, ok := t.Deadline(); ok { // Pad the timeout by an arbitrary 5% to give the AfterFunc time to run. timeout := time.Until(d) * 19 / 20 timer := time.AfterFunc(timeout, func() { // Panic — instead of calling t.Error and returning from the test — so // that we get a useful goroutine dump if the test times out, especially // if GOTRACEBACK=system or GOTRACEBACK=crash is set. if !started.Load() { panic("finalizer did not start") } else { panic(fmt.Sprintf("finalizer started %s ago (%s after registration) and ran %d iterations, but did not return", time.Since(finalizerStart), finalizerStart.Sub(setFinalizerTime), progress.Load())) } }) defer timer.Stop() } GC() wg.Wait() t.Logf("finalizer started after %s and ran %d iterations in %v", finalizerStart.Sub(setFinalizerTime), progress.Load(), time.Since(finalizerStart)) } // ... and in init //func init() { // growStack() //} func growStack(progress *atomic.Uint32) { n := 1 << 10 if testing.Short() { n = 1 << 8 } for i := 0; i < n; i++ { x := 0 growStackIter(&x, i) if x != i+1 { panic("stack is corrupted") } if progress != nil { progress.Store(uint32(i)) } } GC() } // This function is not an anonymous func, so that the compiler can do escape // analysis and place x on stack (and subsequently stack growth update the pointer). func growStackIter(p *int, n int) { if n == 0 { *p = n + 1 GC() return } *p = n + 1 x := 0 growStackIter(&x, n-1) if x != n { panic("stack is corrupted") } } func TestStackGrowthCallback(t *testing.T) { t.Parallel() var wg sync.WaitGroup // test stack growth at chan op wg.Add(1) go func() { defer wg.Done() c := make(chan int, 1) growStackWithCallback(func() { c <- 1 <-c }) }() // test stack growth at map op wg.Add(1) go func() { defer wg.Done() m := make(map[int]int) growStackWithCallback(func() { _, _ = m[1] m[1] = 1 }) }() // test stack growth at goroutine creation wg.Add(1) go func() { defer wg.Done() growStackWithCallback(func() { done := make(chan bool) go func() { done <- true }() <-done }) }() wg.Wait() } func growStackWithCallback(cb func()) { var f func(n int) f = func(n int) { if n == 0 { cb() return } f(n - 1) } for i := 0; i < 1<<10; i++ { f(i) } } // TestDeferPtrs tests the adjustment of Defer's argument pointers (p aka &y) // during a stack copy. func set(p *int, x int) { *p = x } func TestDeferPtrs(t *testing.T) { var y int defer func() { if y != 42 { t.Errorf("defer's stack references were not adjusted appropriately") } }() defer set(&y, 42) growStack(nil) } type bigBuf [4 * 1024]byte // TestDeferPtrsGoexit is like TestDeferPtrs but exercises the possibility that the // stack grows as part of starting the deferred function. It calls Goexit at various // stack depths, forcing the deferred function (with >4kB of args) to be run at // the bottom of the stack. The goal is to find a stack depth less than 4kB from // the end of the stack. Each trial runs in a different goroutine so that an earlier // stack growth does not invalidate a later attempt. func TestDeferPtrsGoexit(t *testing.T) { for i := 0; i < 100; i++ { c := make(chan int, 1) go testDeferPtrsGoexit(c, i) if n := <-c; n != 42 { t.Fatalf("defer's stack references were not adjusted appropriately (i=%d n=%d)", i, n) } } } func testDeferPtrsGoexit(c chan int, i int) { var y int defer func() { c <- y }() defer setBig(&y, 42, bigBuf{}) useStackAndCall(i, Goexit) } func setBig(p *int, x int, b bigBuf) { *p = x } // TestDeferPtrsPanic is like TestDeferPtrsGoexit, but it's using panic instead // of Goexit to run the Defers. Those two are different execution paths // in the runtime. func TestDeferPtrsPanic(t *testing.T) { for i := 0; i < 100; i++ { c := make(chan int, 1) go testDeferPtrsGoexit(c, i) if n := <-c; n != 42 { t.Fatalf("defer's stack references were not adjusted appropriately (i=%d n=%d)", i, n) } } } func testDeferPtrsPanic(c chan int, i int) { var y int defer func() { if recover() == nil { c <- -1 return } c <- y }() defer setBig(&y, 42, bigBuf{}) useStackAndCall(i, func() { panic(1) }) } //go:noinline func testDeferLeafSigpanic1() { // Cause a sigpanic to be injected in this frame. // // This function has to be declared before // TestDeferLeafSigpanic so the runtime will crash if we think // this function's continuation PC is in // TestDeferLeafSigpanic. *(*int)(nil) = 0 } // TestDeferLeafSigpanic tests defer matching around leaf functions // that sigpanic. This is tricky because on LR machines the outer // function and the inner function have the same SP, but it's critical // that we match up the defer correctly to get the right liveness map. // See issue #25499. func TestDeferLeafSigpanic(t *testing.T) { // Push a defer that will walk the stack. defer func() { if err := recover(); err == nil { t.Fatal("expected panic from nil pointer") } GC() }() // Call a leaf function. We must set up the exact call stack: // // deferring function -> leaf function -> sigpanic // // On LR machines, the leaf function will have the same SP as // the SP pushed for the defer frame. testDeferLeafSigpanic1() } // TestPanicUseStack checks that a chain of Panic structs on the stack are // updated correctly if the stack grows during the deferred execution that // happens as a result of the panic. func TestPanicUseStack(t *testing.T) { pc := make([]uintptr, 10000) defer func() { recover() Callers(0, pc) // force stack walk useStackAndCall(100, func() { defer func() { recover() Callers(0, pc) // force stack walk useStackAndCall(200, func() { defer func() { recover() Callers(0, pc) // force stack walk }() panic(3) }) }() panic(2) }) }() panic(1) } func TestPanicFar(t *testing.T) { var xtree *xtreeNode pc := make([]uintptr, 10000) defer func() { // At this point we created a large stack and unwound // it via recovery. Force a stack walk, which will // check the stack's consistency. Callers(0, pc) }() defer func() { recover() }() useStackAndCall(100, func() { // Kick off the GC and make it do something nontrivial. // (This used to force stack barriers to stick around.) xtree = makeTree(18) // Give the GC time to start scanning stacks. time.Sleep(time.Millisecond) panic(1) }) _ = xtree } type xtreeNode struct { l, r *xtreeNode } func makeTree(d int) *xtreeNode { if d == 0 { return new(xtreeNode) } return &xtreeNode{makeTree(d - 1), makeTree(d - 1)} } // use about n KB of stack and call f func useStackAndCall(n int, f func()) { if n == 0 { f() return } var b [1024]byte // makes frame about 1KB useStackAndCall(n-1+int(b[99]), f) } func useStack(n int) { useStackAndCall(n, func() {}) } func growing(c chan int, done chan struct{}) { for n := range c { useStack(n) done <- struct{}{} } done <- struct{}{} } func TestStackCache(t *testing.T) { // Allocate a bunch of goroutines and grow their stacks. // Repeat a few times to test the stack cache. const ( R = 4 G = 200 S = 5 ) for i := 0; i < R; i++ { var reqchans [G]chan int done := make(chan struct{}) for j := 0; j < G; j++ { reqchans[j] = make(chan int) go growing(reqchans[j], done) } for s := 0; s < S; s++ { for j := 0; j < G; j++ { reqchans[j] <- 1 << uint(s) } for j := 0; j < G; j++ { <-done } } for j := 0; j < G; j++ { close(reqchans[j]) } for j := 0; j < G; j++ { <-done } } } func TestStackOutput(t *testing.T) { b := make([]byte, 1024) stk := string(b[:Stack(b, false)]) if !strings.HasPrefix(stk, "goroutine ") { t.Errorf("Stack (len %d):\n%s", len(stk), stk) t.Errorf("Stack output should begin with \"goroutine \"") } } func TestStackAllOutput(t *testing.T) { b := make([]byte, 1024) stk := string(b[:Stack(b, true)]) if !strings.HasPrefix(stk, "goroutine ") { t.Errorf("Stack (len %d):\n%s", len(stk), stk) t.Errorf("Stack output should begin with \"goroutine \"") } } func TestStackPanic(t *testing.T) { // Test that stack copying copies panics correctly. This is difficult // to test because it is very unlikely that the stack will be copied // in the middle of gopanic. But it can happen. // To make this test effective, edit panic.go:gopanic and uncomment // the GC() call just before freedefer(d). defer func() { if x := recover(); x == nil { t.Errorf("recover failed") } }() useStack(32) panic("test panic") } func BenchmarkStackCopyPtr(b *testing.B) { c := make(chan bool) for i := 0; i < b.N; i++ { go func() { i := 1000000 countp(&i) c <- true }() <-c } } func countp(n *int) { if *n == 0 { return } *n-- countp(n) } func BenchmarkStackCopy(b *testing.B) { c := make(chan bool) for i := 0; i < b.N; i++ { go func() { count(1000000) c <- true }() <-c } } func count(n int) int { if n == 0 { return 0 } return 1 + count(n-1) } func BenchmarkStackCopyNoCache(b *testing.B) { c := make(chan bool) for i := 0; i < b.N; i++ { go func() { count1(1000000) c <- true }() <-c } } func count1(n int) int { if n <= 0 { return 0 } return 1 + count2(n-1) } func count2(n int) int { return 1 + count3(n-1) } func count3(n int) int { return 1 + count4(n-1) } func count4(n int) int { return 1 + count5(n-1) } func count5(n int) int { return 1 + count6(n-1) } func count6(n int) int { return 1 + count7(n-1) } func count7(n int) int { return 1 + count8(n-1) } func count8(n int) int { return 1 + count9(n-1) } func count9(n int) int { return 1 + count10(n-1) } func count10(n int) int { return 1 + count11(n-1) } func count11(n int) int { return 1 + count12(n-1) } func count12(n int) int { return 1 + count13(n-1) } func count13(n int) int { return 1 + count14(n-1) } func count14(n int) int { return 1 + count15(n-1) } func count15(n int) int { return 1 + count16(n-1) } func count16(n int) int { return 1 + count17(n-1) } func count17(n int) int { return 1 + count18(n-1) } func count18(n int) int { return 1 + count19(n-1) } func count19(n int) int { return 1 + count20(n-1) } func count20(n int) int { return 1 + count21(n-1) } func count21(n int) int { return 1 + count22(n-1) } func count22(n int) int { return 1 + count23(n-1) } func count23(n int) int { return 1 + count1(n-1) } type stkobjT struct { p *stkobjT x int64 y [20]int // consume some stack } // Sum creates a linked list of stkobjTs. func Sum(n int64, p *stkobjT) { if n == 0 { return } s := stkobjT{p: p, x: n} Sum(n-1, &s) p.x += s.x } func BenchmarkStackCopyWithStkobj(b *testing.B) { c := make(chan bool) for i := 0; i < b.N; i++ { go func() { var s stkobjT Sum(100000, &s) c <- true }() <-c } } func BenchmarkIssue18138(b *testing.B) { // Channel with N "can run a goroutine" tokens const N = 10 c := make(chan []byte, N) for i := 0; i < N; i++ { c <- make([]byte, 1) } for i := 0; i < b.N; i++ { <-c // get token go func() { useStackPtrs(1000, false) // uses ~1MB max m := make([]byte, 8192) // make GC trigger occasionally c <- m // return token }() } } func useStackPtrs(n int, b bool) { if b { // This code contributes to the stack frame size, and hence to the // stack copying cost. But since b is always false, it costs no // execution time (not even the zeroing of a). var a [128]*int // 1KB of pointers a[n] = &n n = *a[0] } if n == 0 { return } useStackPtrs(n-1, b) } type structWithMethod struct{} func (s structWithMethod) caller() string { _, file, line, ok := Caller(1) if !ok { panic("Caller failed") } return fmt.Sprintf("%s:%d", file, line) } func (s structWithMethod) callers() []uintptr { pc := make([]uintptr, 16) return pc[:Callers(0, pc)] } func (s structWithMethod) stack() string { buf := make([]byte, 4<<10) return string(buf[:Stack(buf, false)]) } func (s structWithMethod) nop() {} func (s structWithMethod) inlinablePanic() { panic("panic") } func TestStackWrapperCaller(t *testing.T) { var d structWithMethod // Force the compiler to construct a wrapper method. wrapper := (*structWithMethod).caller // Check that the wrapper doesn't affect the stack trace. if dc, ic := d.caller(), wrapper(&d); dc != ic { t.Fatalf("direct caller %q != indirect caller %q", dc, ic) } } func TestStackWrapperCallers(t *testing.T) { var d structWithMethod wrapper := (*structWithMethod).callers // Check that <autogenerated> doesn't appear in the stack trace. pcs := wrapper(&d) frames := CallersFrames(pcs) for { fr, more := frames.Next() if fr.File == "<autogenerated>" { t.Fatalf("<autogenerated> appears in stack trace: %+v", fr) } if !more { break } } } func TestStackWrapperStack(t *testing.T) { var d structWithMethod wrapper := (*structWithMethod).stack // Check that <autogenerated> doesn't appear in the stack trace. stk := wrapper(&d) if strings.Contains(stk, "<autogenerated>") { t.Fatalf("<autogenerated> appears in stack trace:\n%s", stk) } } func TestStackWrapperStackInlinePanic(t *testing.T) { // Test that inline unwinding correctly tracks the callee by creating a // stack of the form wrapper -> inlined function -> panic. If we mess up // callee tracking, it will look like the wrapper called panic and we'll see // the wrapper in the stack trace. var d structWithMethod wrapper := (*structWithMethod).inlinablePanic defer func() { err := recover() if err == nil { t.Fatalf("expected panic") } buf := make([]byte, 4<<10) stk := string(buf[:Stack(buf, false)]) if strings.Contains(stk, "<autogenerated>") { t.Fatalf("<autogenerated> appears in stack trace:\n%s", stk) } // Self-check: make sure inlinablePanic got inlined. if !testenv.OptimizationOff() { if !strings.Contains(stk, "inlinablePanic(...)") { t.Fatalf("inlinablePanic not inlined") } } }() wrapper(&d) } type I interface { M() } func TestStackWrapperStackPanic(t *testing.T) { t.Run("sigpanic", func(t *testing.T) { // nil calls to interface methods cause a sigpanic. testStackWrapperPanic(t, func() { I.M(nil) }, "runtime_test.I.M") }) t.Run("panicwrap", func(t *testing.T) { // Nil calls to value method wrappers call panicwrap. wrapper := (*structWithMethod).nop testStackWrapperPanic(t, func() { wrapper(nil) }, "runtime_test.(*structWithMethod).nop") }) } func testStackWrapperPanic(t *testing.T, cb func(), expect string) { // Test that the stack trace from a panicking wrapper includes // the wrapper, even though elide these when they don't panic. t.Run("CallersFrames", func(t *testing.T) { defer func() { err := recover() if err == nil { t.Fatalf("expected panic") } pcs := make([]uintptr, 10) n := Callers(0, pcs) frames := CallersFrames(pcs[:n]) for { frame, more := frames.Next() t.Log(frame.Function) if frame.Function == expect { return } if !more { break } } t.Fatalf("panicking wrapper %s missing from stack trace", expect) }() cb() }) t.Run("Stack", func(t *testing.T) { defer func() { err := recover() if err == nil { t.Fatalf("expected panic") } buf := make([]byte, 4<<10) stk := string(buf[:Stack(buf, false)]) if !strings.Contains(stk, "\n"+expect) { t.Fatalf("panicking wrapper %s missing from stack trace:\n%s", expect, stk) } }() cb() }) } func TestCallersFromWrapper(t *testing.T) { // Test that invoking CallersFrames on a stack where the first // PC is an autogenerated wrapper keeps the wrapper in the // trace. Normally we elide these, assuming that the wrapper // calls the thing you actually wanted to see, but in this // case we need to keep it. pc := reflect.ValueOf(I.M).Pointer() frames := CallersFrames([]uintptr{pc}) frame, more := frames.Next() if frame.Function != "runtime_test.I.M" { t.Fatalf("want function %s, got %s", "runtime_test.I.M", frame.Function) } if more { t.Fatalf("want 1 frame, got > 1") } } func TestTracebackSystemstack(t *testing.T) { if GOARCH == "ppc64" || GOARCH == "ppc64le" { t.Skip("systemstack tail call not implemented on ppc64x") } // Test that profiles correctly jump over systemstack, // including nested systemstack calls. pcs := make([]uintptr, 20) pcs = pcs[:TracebackSystemstack(pcs, 5)] // Check that runtime.TracebackSystemstack appears five times // and that we see TestTracebackSystemstack. countIn, countOut := 0, 0 frames := CallersFrames(pcs) var tb strings.Builder for { frame, more := frames.Next() fmt.Fprintf(&tb, "\n%s+0x%x %s:%d", frame.Function, frame.PC-frame.Entry, frame.File, frame.Line) switch frame.Function { case "runtime.TracebackSystemstack": countIn++ case "runtime_test.TestTracebackSystemstack": countOut++ } if !more { break } } if countIn != 5 || countOut != 1 { t.Fatalf("expected 5 calls to TracebackSystemstack and 1 call to TestTracebackSystemstack, got:%s", tb.String()) } } func TestTracebackAncestors(t *testing.T) { goroutineRegex := regexp.MustCompile(`goroutine [0-9]+ \[`) for _, tracebackDepth := range []int{0, 1, 5, 50} { output := runTestProg(t, "testprog", "TracebackAncestors", fmt.Sprintf("GODEBUG=tracebackancestors=%d", tracebackDepth)) numGoroutines := 3 numFrames := 2 ancestorsExpected := numGoroutines if numGoroutines > tracebackDepth { ancestorsExpected = tracebackDepth } matches := goroutineRegex.FindAllStringSubmatch(output, -1) if len(matches) != 2 { t.Fatalf("want 2 goroutines, got:\n%s", output) } // Check functions in the traceback. fns := []string{"main.recurseThenCallGo", "main.main", "main.printStack", "main.TracebackAncestors"} for _, fn := range fns { if !strings.Contains(output, "\n"+fn+"(") { t.Fatalf("expected %q function in traceback:\n%s", fn, output) } } if want, count := "originating from goroutine", ancestorsExpected; strings.Count(output, want) != count { t.Errorf("output does not contain %d instances of %q:\n%s", count, want, output) } if want, count := "main.recurseThenCallGo(...)", ancestorsExpected*(numFrames+1); strings.Count(output, want) != count { t.Errorf("output does not contain %d instances of %q:\n%s", count, want, output) } if want, count := "main.recurseThenCallGo(0x", 1; strings.Count(output, want) != count { t.Errorf("output does not contain %d instances of %q:\n%s", count, want, output) } } } // Test that defer closure is correctly scanned when the stack is scanned. func TestDeferLiveness(t *testing.T) { output := runTestProg(t, "testprog", "DeferLiveness", "GODEBUG=clobberfree=1") if output != "" { t.Errorf("output:\n%s\n\nwant no output", output) } } func TestDeferHeapAndStack(t *testing.T) { P := 4 // processors N := 10000 //iterations D := 200 // stack depth if testing.Short() { P /= 2 N /= 10 D /= 10 } c := make(chan bool) for p := 0; p < P; p++ { go func() { for i := 0; i < N; i++ { if deferHeapAndStack(D) != 2*D { panic("bad result") } } c <- true }() } for p := 0; p < P; p++ { <-c } } // deferHeapAndStack(n) computes 2*n func deferHeapAndStack(n int) (r int) { if n == 0 { return 0 } if n%2 == 0 { // heap-allocated defers for i := 0; i < 2; i++ { defer func() { r++ }() } } else { // stack-allocated defers defer func() { r++ }() defer func() { r++ }() } r = deferHeapAndStack(n - 1) escapeMe(new([1024]byte)) // force some GCs return } // Pass a value to escapeMe to force it to escape. var escapeMe = func(x any) {} func TestFramePointerAdjust(t *testing.T) { switch GOARCH { case "amd64", "arm64": default: t.Skipf("frame pointer is not supported on %s", GOARCH) } output := runTestProg(t, "testprog", "FramePointerAdjust") if output != "" { t.Errorf("output:\n%s\n\nwant no output", output) } } // TestSystemstackFramePointerAdjust is a regression test for issue 59692 that // ensures that the frame pointer of systemstack is correctly adjusted. See CL // 489015 for more details. func TestSystemstackFramePointerAdjust(t *testing.T) { growAndShrinkStack(512, [1024]byte{}) } // growAndShrinkStack grows the stack of the current goroutine in order to // shrink it again and verify that all frame pointers on the new stack have // been correctly adjusted. stackBallast is used to ensure we're not depending // on the current heuristics of stack shrinking too much. func growAndShrinkStack(n int, stackBallast [1024]byte) { if n <= 0 { return } growAndShrinkStack(n-1, stackBallast) ShrinkStackAndVerifyFramePointers() }
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