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Current Path: /opt/golang/1.22.0/src/runtime

📁 ..
📄 HACKING.md(13.85 KB)
📄 Makefile(178 B)
📄 abi_test.go(2.83 KB)
📄 alg.go(10.99 KB)
📄 align_runtime_test.go(1.82 KB)
📄 align_test.go(5.37 KB)
📄 arena.go(31.66 KB)
📄 arena_test.go(13.39 KB)
📁 asan
📄 asan.go(1.55 KB)
📄 asan0.go(760 B)
📄 asan_amd64.s(2.45 KB)
📄 asan_arm64.s(2.14 KB)
📄 asan_loong64.s(2.12 KB)
📄 asan_ppc64le.s(2.75 KB)
📄 asan_riscv64.s(1.92 KB)
📄 asm.s(719 B)
📄 asm_386.s(42.54 KB)
📄 asm_amd64.h(631 B)
📄 asm_amd64.s(60.09 KB)
📄 asm_arm.s(31.58 KB)
📄 asm_arm64.s(43.33 KB)
📄 asm_loong64.s(27.58 KB)
📄 asm_mips64x.s(24.34 KB)
📄 asm_mipsx.s(25.82 KB)
📄 asm_ppc64x.h(1.93 KB)
📄 asm_ppc64x.s(45.19 KB)
📄 asm_riscv64.s(26.97 KB)
📄 asm_s390x.s(27.55 KB)
📄 asm_wasm.s(11.82 KB)
📄 atomic_arm64.s(259 B)
📄 atomic_loong64.s(245 B)
📄 atomic_mips64x.s(300 B)
📄 atomic_mipsx.s(262 B)
📄 atomic_pointer.go(3.66 KB)
📄 atomic_ppc64x.s(437 B)
📄 atomic_riscv64.s(275 B)
📄 auxv_none.go(298 B)
📄 callers_test.go(12.13 KB)
📁 cgo
📄 cgo.go(2.5 KB)
📄 cgo_mmap.go(2.42 KB)
📄 cgo_ppc64x.go(418 B)
📄 cgo_sigaction.go(3.28 KB)
📄 cgocall.go(23.23 KB)
📄 cgocallback.go(317 B)
📄 cgocheck.go(7.97 KB)
📄 chan.go(23.74 KB)
📄 chan_test.go(23.44 KB)
📄 chanbarrier_test.go(1.4 KB)
📄 checkptr.go(3.29 KB)
📄 checkptr_test.go(2.86 KB)
📄 closure_test.go(937 B)
📄 compiler.go(410 B)
📄 complex.go(1.59 KB)
📄 complex_test.go(1.05 KB)
📄 conv_wasm_test.go(2.96 KB)
📄 coro.go(4.92 KB)
📁 coverage
📄 covercounter.go(749 B)
📄 covermeta.go(2.4 KB)
📄 cpuflags.go(810 B)
📄 cpuflags_amd64.go(533 B)
📄 cpuflags_arm64.go(312 B)
📄 cpuprof.go(7.94 KB)
📄 cputicks.go(437 B)
📄 crash_cgo_test.go(23.35 KB)
📄 crash_test.go(23.12 KB)
📄 crash_unix_test.go(9.19 KB)
📄 create_file_nounix.go(305 B)
📄 create_file_unix.go(368 B)
📁 debug
📄 debug.go(3.53 KB)
📄 debug_test.go(7.99 KB)
📄 debugcall.go(6.75 KB)
📄 debuglog.go(18.24 KB)
📄 debuglog_off.go(357 B)
📄 debuglog_on.go(1.09 KB)
📄 debuglog_test.go(4.9 KB)
📄 defer_test.go(11.4 KB)
📄 defs1_linux.go(845 B)
📄 defs1_netbsd_386.go(2.91 KB)
📄 defs1_netbsd_amd64.go(3.14 KB)
📄 defs1_netbsd_arm.go(3.03 KB)
📄 defs1_netbsd_arm64.go(3.25 KB)
📄 defs1_solaris_amd64.go(4.01 KB)
📄 defs2_linux.go(3.22 KB)
📄 defs3_linux.go(1.09 KB)
📄 defs_aix.go(4.17 KB)
📄 defs_aix_ppc64.go(3.63 KB)
📄 defs_arm_linux.go(2.67 KB)
📄 defs_darwin.go(4.18 KB)
📄 defs_darwin_amd64.go(6.34 KB)
📄 defs_darwin_arm64.go(4.17 KB)
📄 defs_dragonfly.go(2.73 KB)
📄 defs_dragonfly_amd64.go(3.41 KB)
📄 defs_freebsd.go(3.96 KB)
📄 defs_freebsd_386.go(4.52 KB)
📄 defs_freebsd_amd64.go(4.79 KB)
📄 defs_freebsd_arm.go(3.92 KB)
📄 defs_freebsd_arm64.go(4.18 KB)
📄 defs_freebsd_riscv64.go(4.19 KB)
📄 defs_illumos_amd64.go(285 B)
📄 defs_linux.go(2.92 KB)
📄 defs_linux_386.go(4.2 KB)
📄 defs_linux_amd64.go(4.7 KB)
📄 defs_linux_arm.go(3.89 KB)
📄 defs_linux_arm64.go(3.62 KB)
📄 defs_linux_loong64.go(3.43 KB)
📄 defs_linux_mips64x.go(3.6 KB)
📄 defs_linux_mipsx.go(3.6 KB)
📄 defs_linux_ppc64.go(3.69 KB)
📄 defs_linux_ppc64le.go(3.69 KB)
📄 defs_linux_riscv64.go(3.81 KB)
📄 defs_linux_s390x.go(3.16 KB)
📄 defs_netbsd.go(2.83 KB)
📄 defs_netbsd_386.go(855 B)
📄 defs_netbsd_amd64.go(1.01 KB)
📄 defs_netbsd_arm.go(764 B)
📄 defs_openbsd.go(3.06 KB)
📄 defs_openbsd_386.go(2.91 KB)
📄 defs_openbsd_amd64.go(3.11 KB)
📄 defs_openbsd_arm.go(3.03 KB)
📄 defs_openbsd_arm64.go(2.78 KB)
📄 defs_openbsd_mips64.go(2.75 KB)
📄 defs_openbsd_ppc64.go(3 KB)
📄 defs_openbsd_riscv64.go(2.89 KB)
📄 defs_plan9_386.go(1.63 KB)
📄 defs_plan9_amd64.go(1.82 KB)
📄 defs_plan9_arm.go(1.73 KB)
📄 defs_solaris.go(3.32 KB)
📄 defs_solaris_amd64.go(1004 B)
📄 defs_windows.go(2.25 KB)
📄 defs_windows_386.go(2.28 KB)
📄 defs_windows_amd64.go(3.19 KB)
📄 defs_windows_arm.go(2.57 KB)
📄 defs_windows_arm64.go(3.07 KB)
📄 duff_386.s(8.24 KB)
📄 duff_amd64.s(5.64 KB)
📄 duff_arm.s(7.11 KB)
📄 duff_arm64.s(5.27 KB)
📄 duff_loong64.s(11.9 KB)
📄 duff_mips64x.s(11.28 KB)
📄 duff_ppc64x.s(7.06 KB)
📄 duff_riscv64.s(11.4 KB)
📄 duff_s390x.s(507 B)
📄 ehooks_test.go(2.04 KB)
📄 env_plan9.go(3 KB)
📄 env_posix.go(1.56 KB)
📄 env_test.go(1.16 KB)
📄 error.go(9.29 KB)
📄 example_test.go(1.55 KB)
📄 exithook.go(2.32 KB)
📄 export_aix_test.go(207 B)
📄 export_arm_test.go(226 B)
📄 export_darwin_test.go(207 B)
📄 export_debug_amd64_test.go(3.6 KB)
📄 export_debug_arm64_test.go(3.49 KB)
📄 export_debug_ppc64le_test.go(3.5 KB)
📄 export_debug_test.go(5.07 KB)
📄 export_debuglog_test.go(1.27 KB)
📄 export_linux_test.go(378 B)
📄 export_mmap_test.go(429 B)
📄 export_pipe2_test.go(310 B)
📄 export_pipe_test.go(219 B)
📄 export_test.go(50.52 KB)
📄 export_unix_test.go(2.27 KB)
📄 export_windows_test.go(903 B)
📄 extern.go(18.58 KB)
📄 fastlog2.go(1.22 KB)
📄 fastlog2_test.go(784 B)
📄 fastlog2table.go(904 B)
📄 fds_nonunix.go(256 B)
📄 fds_test.go(1.43 KB)
📄 fds_unix.go(1.27 KB)
📄 float.go(1.35 KB)
📄 float_test.go(699 B)
📄 funcdata.h(2.53 KB)
📄 gc_test.go(20.32 KB)
📄 gcinfo_test.go(5.95 KB)
📄 go_tls.h(366 B)
📄 hash32.go(1.58 KB)
📄 hash64.go(1.95 KB)
📄 hash_test.go(17.24 KB)
📄 heap_test.go(529 B)
📄 heapdump.go(17.88 KB)
📄 histogram.go(7.3 KB)
📄 histogram_test.go(3.51 KB)
📄 iface.go(20.92 KB)
📄 iface_test.go(7.45 KB)
📄 import_test.go(1.42 KB)
📄 importx_test.go(763 B)
📁 internal
📄 lfstack.go(2.03 KB)
📄 lfstack_test.go(2.74 KB)
📄 libfuzzer.go(6.34 KB)
📄 libfuzzer_amd64.s(5.03 KB)
📄 libfuzzer_arm64.s(3.15 KB)
📄 lock_futex.go(5.4 KB)
📄 lock_js.go(7.28 KB)
📄 lock_sema.go(6.75 KB)
📄 lock_wasip1.go(2.01 KB)
📄 lockrank.go(18.19 KB)
📄 lockrank_off.go(1.17 KB)
📄 lockrank_on.go(10.27 KB)
📄 lockrank_test.go(856 B)
📄 malloc.go(58.5 KB)
📄 malloc_test.go(10.64 KB)
📄 map.go(52.17 KB)
📄 map_benchmark_test.go(10.59 KB)
📄 map_fast32.go(12.74 KB)
📄 map_fast64.go(12.92 KB)
📄 map_faststr.go(14.32 KB)
📄 map_test.go(31.75 KB)
📄 mbarrier.go(13.78 KB)
📄 mbitmap.go(22.54 KB)
📄 mbitmap_allocheaders.go(44.67 KB)
📄 mbitmap_noallocheaders.go(28.95 KB)
📄 mcache.go(10 KB)
📄 mcentral.go(8.05 KB)
📄 mcheckmark.go(2.85 KB)
📄 mem.go(6.72 KB)
📄 mem_aix.go(2.01 KB)
📄 mem_bsd.go(2.21 KB)
📄 mem_darwin.go(1.96 KB)
📄 mem_js.go(457 B)
📄 mem_linux.go(4.98 KB)
📄 mem_plan9.go(447 B)
📄 mem_sbrk.go(4.19 KB)
📄 mem_wasip1.go(392 B)
📄 mem_wasm.go(488 B)
📄 mem_windows.go(3.88 KB)
📄 memclr_386.s(2.38 KB)
📄 memclr_amd64.s(4.91 KB)
📄 memclr_arm.s(2.6 KB)
📄 memclr_arm64.s(3.62 KB)
📄 memclr_loong64.s(843 B)
📄 memclr_mips64x.s(1.72 KB)
📄 memclr_mipsx.s(1.32 KB)
📄 memclr_plan9_386.s(983 B)
📄 memclr_plan9_amd64.s(511 B)
📄 memclr_ppc64x.s(4.44 KB)
📄 memclr_riscv64.s(1.71 KB)
📄 memclr_s390x.s(1.96 KB)
📄 memclr_wasm.s(485 B)
📄 memmove_386.s(4.42 KB)
📄 memmove_amd64.s(12.48 KB)
📄 memmove_arm.s(5.9 KB)
📄 memmove_arm64.s(5.96 KB)
📄 memmove_linux_amd64_test.go(1.53 KB)
📄 memmove_loong64.s(1.87 KB)
📄 memmove_mips64x.s(1.83 KB)
📄 memmove_mipsx.s(4.4 KB)
📄 memmove_plan9_386.s(3.06 KB)
📄 memmove_plan9_amd64.s(3.04 KB)
📄 memmove_ppc64x.s(4.91 KB)
📄 memmove_riscv64.s(5.46 KB)
📄 memmove_s390x.s(2.92 KB)
📄 memmove_test.go(21.23 KB)
📄 memmove_wasm.s(479 B)
📁 metrics
📄 metrics.go(26.01 KB)
📄 metrics_test.go(42.46 KB)
📄 mfinal.go(18.91 KB)
📄 mfinal_test.go(5.57 KB)
📄 mfixalloc.go(3.13 KB)
📄 mgc.go(59.29 KB)
📄 mgclimit.go(17.28 KB)
📄 mgclimit_test.go(9.02 KB)
📄 mgcmark.go(53.07 KB)
📄 mgcpacer.go(55.36 KB)
📄 mgcpacer_test.go(39.26 KB)
📄 mgcscavenge.go(52.32 KB)
📄 mgcscavenge_test.go(25.2 KB)
📄 mgcstack.go(10.58 KB)
📄 mgcsweep.go(32.26 KB)
📄 mgcwork.go(12.89 KB)
📄 mheap.go(72.64 KB)
📄 minmax.go(1.46 KB)
📄 minmax_test.go(3.31 KB)
📄 mkduff.go(8.04 KB)
📄 mkfastlog2table.go(3.08 KB)
📄 mklockrank.go(9 KB)
📄 mkpreempt.go(15.33 KB)
📄 mksizeclasses.go(9.52 KB)
📄 mmap.go(844 B)
📄 mpagealloc.go(39.23 KB)
📄 mpagealloc_32bit.go(4.56 KB)
📄 mpagealloc_64bit.go(9.34 KB)
📄 mpagealloc_test.go(32.59 KB)
📄 mpagecache.go(5.59 KB)
📄 mpagecache_test.go(10.79 KB)
📄 mpallocbits.go(12.58 KB)
📄 mpallocbits_test.go(13.69 KB)
📄 mprof.go(47.4 KB)
📄 mranges.go(14.46 KB)
📄 mranges_test.go(5.68 KB)
📁 msan
📄 msan.go(1.5 KB)
📄 msan0.go(725 B)
📄 msan_amd64.s(2.3 KB)
📄 msan_arm64.s(1.98 KB)
📄 msan_loong64.s(1.96 KB)
📄 msize_allocheaders.go(1.32 KB)
📄 msize_noallocheaders.go(915 B)
📄 mspanset.go(13.12 KB)
📄 mstats.go(33.81 KB)
📄 mwbbuf.go(8.13 KB)
📄 nbpipe_pipe.go(405 B)
📄 nbpipe_pipe2.go(344 B)
📄 nbpipe_pipe_test.go(706 B)
📄 nbpipe_test.go(1.99 KB)
📄 net_plan9.go(645 B)
📄 netpoll.go(20.55 KB)
📄 netpoll_aix.go(5.06 KB)
📄 netpoll_epoll.go(4.4 KB)
📄 netpoll_fake.go(664 B)
📄 netpoll_kqueue.go(5.62 KB)
📄 netpoll_os_test.go(520 B)
📄 netpoll_solaris.go(11.2 KB)
📄 netpoll_stub.go(1.48 KB)
📄 netpoll_wasip1.go(6.08 KB)
📄 netpoll_windows.go(4.01 KB)
📄 nonwindows_stub.go(729 B)
📄 norace_linux_test.go(915 B)
📄 norace_test.go(983 B)
📄 numcpu_freebsd_test.go(381 B)
📄 os2_aix.go(20.88 KB)
📄 os2_freebsd.go(302 B)
📄 os2_openbsd.go(296 B)
📄 os2_plan9.go(1.48 KB)
📄 os2_solaris.go(320 B)
📄 os3_plan9.go(3.94 KB)
📄 os3_solaris.go(17.59 KB)
📄 os_aix.go(8.89 KB)
📄 os_android.go(463 B)
📄 os_darwin.go(11.92 KB)
📄 os_darwin_arm64.go(329 B)
📄 os_dragonfly.go(7.14 KB)
📄 os_freebsd.go(11.64 KB)
📄 os_freebsd2.go(603 B)
📄 os_freebsd_amd64.go(658 B)
📄 os_freebsd_arm.go(1.45 KB)
📄 os_freebsd_arm64.go(320 B)
📄 os_freebsd_noauxv.go(241 B)
📄 os_freebsd_riscv64.go(198 B)
📄 os_illumos.go(3.93 KB)
📄 os_js.go(767 B)
📄 os_linux.go(25.71 KB)
📄 os_linux_arm.go(1.51 KB)
📄 os_linux_arm64.go(478 B)
📄 os_linux_be64.go(806 B)
📄 os_linux_generic.go(870 B)
📄 os_linux_loong64.go(263 B)
📄 os_linux_mips64x.go(996 B)
📄 os_linux_mipsx.go(987 B)
📄 os_linux_noauxv.go(337 B)
📄 os_linux_novdso.go(347 B)
📄 os_linux_ppc64x.go(526 B)
📄 os_linux_riscv64.go(198 B)
📄 os_linux_s390x.go(825 B)
📄 os_linux_x86.go(234 B)
📄 os_netbsd.go(10.12 KB)
📄 os_netbsd_386.go(617 B)
📄 os_netbsd_amd64.go(614 B)
📄 os_netbsd_arm.go(1.07 KB)
📄 os_netbsd_arm64.go(769 B)
📄 os_nonopenbsd.go(437 B)
📄 os_only_solaris.go(357 B)
📄 os_openbsd.go(6.23 KB)
📄 os_openbsd_arm.go(662 B)
📄 os_openbsd_arm64.go(329 B)
📄 os_openbsd_libc.go(1.49 KB)
📄 os_openbsd_mips64.go(329 B)
📄 os_openbsd_syscall.go(1.36 KB)
📄 os_openbsd_syscall1.go(441 B)
📄 os_openbsd_syscall2.go(2.51 KB)
📄 os_plan9.go(10.18 KB)
📄 os_plan9_arm.go(375 B)
📄 os_solaris.go(6.62 KB)
📄 os_unix.go(436 B)
📄 os_unix_nonlinux.go(374 B)
📄 os_wasip1.go(7 KB)
📄 os_wasm.go(3.15 KB)
📄 os_windows.go(41.39 KB)
📄 os_windows_arm.go(511 B)
📄 os_windows_arm64.go(339 B)
📄 pagetrace_off.go(550 B)
📄 pagetrace_on.go(10.36 KB)
📄 panic.go(41.85 KB)
📄 panic32.go(4.8 KB)
📄 panic_test.go(1.71 KB)
📄 panicnil_test.go(1.25 KB)
📄 pinner.go(10.98 KB)
📄 pinner_test.go(11.04 KB)
📄 plugin.go(4.37 KB)
📁 pprof
📄 preempt.go(15.03 KB)
📄 preempt_386.s(824 B)
📄 preempt_amd64.s(1.67 KB)
📄 preempt_arm.s(1.49 KB)
📄 preempt_arm64.s(1.97 KB)
📄 preempt_loong64.s(2.41 KB)
📄 preempt_mips64x.s(2.72 KB)
📄 preempt_mipsx.s(2.68 KB)
📄 preempt_nonwindows.go(290 B)
📄 preempt_ppc64x.s(2.72 KB)
📄 preempt_riscv64.s(2.26 KB)
📄 preempt_s390x.s(1.01 KB)
📄 preempt_wasm.s(176 B)
📄 print.go(5.92 KB)
📄 proc.go(204.28 KB)
📄 proc_runtime_test.go(1.38 KB)
📄 proc_test.go(25.85 KB)
📄 profbuf.go(18.26 KB)
📄 profbuf_test.go(8.54 KB)
📄 proflabel.go(1.52 KB)
📁 race
📄 race.go(18.81 KB)
📄 race0.go(2.79 KB)
📄 race_amd64.s(13.94 KB)
📄 race_arm64.s(14.21 KB)
📄 race_ppc64le.s(15.93 KB)
📄 race_s390x.s(11.99 KB)
📄 rand.go(7.11 KB)
📄 rand_test.go(1.95 KB)
📄 rdebug.go(550 B)
📄 retry.go(760 B)
📄 rt0_aix_ppc64.s(4.09 KB)
📄 rt0_android_386.s(822 B)
📄 rt0_android_amd64.s(754 B)
📄 rt0_android_arm.s(843 B)
📄 rt0_android_arm64.s(941 B)
📄 rt0_darwin_amd64.s(399 B)
📄 rt0_darwin_arm64.s(1.69 KB)
📄 rt0_dragonfly_amd64.s(448 B)
📄 rt0_freebsd_386.s(454 B)
📄 rt0_freebsd_amd64.s(442 B)
📄 rt0_freebsd_arm.s(298 B)
📄 rt0_freebsd_arm64.s(1.88 KB)
📄 rt0_freebsd_riscv64.s(2.72 KB)
📄 rt0_illumos_amd64.s(311 B)
📄 rt0_ios_amd64.s(425 B)
📄 rt0_ios_arm64.s(425 B)
📄 rt0_js_wasm.s(1.53 KB)
📄 rt0_linux_386.s(450 B)
📄 rt0_linux_amd64.s(307 B)
📄 rt0_linux_arm.s(1007 B)
📄 rt0_linux_arm64.s(1.81 KB)
📄 rt0_linux_loong64.s(2.01 KB)
📄 rt0_linux_mips64x.s(1014 B)
📄 rt0_linux_mipsx.s(797 B)
📄 rt0_linux_ppc64.s(847 B)
📄 rt0_linux_ppc64le.s(2.89 KB)
📄 rt0_linux_riscv64.s(2.65 KB)
📄 rt0_linux_s390x.s(676 B)
📄 rt0_netbsd_386.s(452 B)
📄 rt0_netbsd_amd64.s(309 B)
📄 rt0_netbsd_arm.s(296 B)
📄 rt0_netbsd_arm64.s(1.8 KB)
📄 rt0_openbsd_386.s(454 B)
📄 rt0_openbsd_amd64.s(311 B)
📄 rt0_openbsd_arm.s(298 B)
📄 rt0_openbsd_arm64.s(1.96 KB)
📄 rt0_openbsd_mips64.s(976 B)
📄 rt0_openbsd_ppc64.s(370 B)
📄 rt0_openbsd_riscv64.s(372 B)
📄 rt0_plan9_386.s(523 B)
📄 rt0_plan9_amd64.s(481 B)
📄 rt0_plan9_arm.s(397 B)
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Editing: mranges.go

// Copyright 2019 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.

// Address range data structure.
//
// This file contains an implementation of a data structure which
// manages ordered address ranges.

package runtime

import (
	"internal/goarch"
	"runtime/internal/atomic"
	"unsafe"
)

// addrRange represents a region of address space.
//
// An addrRange must never span a gap in the address space.
type addrRange struct {
	// base and limit together represent the region of address space
	// [base, limit). That is, base is inclusive, limit is exclusive.
	// These are address over an offset view of the address space on
	// platforms with a segmented address space, that is, on platforms
	// where arenaBaseOffset != 0.
	base, limit offAddr
}

// makeAddrRange creates a new address range from two virtual addresses.
//
// Throws if the base and limit are not in the same memory segment.
func makeAddrRange(base, limit uintptr) addrRange {
	r := addrRange{offAddr{base}, offAddr{limit}}
	if (base-arenaBaseOffset >= base) != (limit-arenaBaseOffset >= limit) {
		throw("addr range base and limit are not in the same memory segment")
	}
	return r
}

// size returns the size of the range represented in bytes.
func (a addrRange) size() uintptr {
	if !a.base.lessThan(a.limit) {
		return 0
	}
	// Subtraction is safe because limit and base must be in the same
	// segment of the address space.
	return a.limit.diff(a.base)
}

// contains returns whether or not the range contains a given address.
func (a addrRange) contains(addr uintptr) bool {
	return a.base.lessEqual(offAddr{addr}) && (offAddr{addr}).lessThan(a.limit)
}

// subtract takes the addrRange toPrune and cuts out any overlap with
// from, then returns the new range. subtract assumes that a and b
// either don't overlap at all, only overlap on one side, or are equal.
// If b is strictly contained in a, thus forcing a split, it will throw.
func (a addrRange) subtract(b addrRange) addrRange {
	if b.base.lessEqual(a.base) && a.limit.lessEqual(b.limit) {
		return addrRange{}
	} else if a.base.lessThan(b.base) && b.limit.lessThan(a.limit) {
		throw("bad prune")
	} else if b.limit.lessThan(a.limit) && a.base.lessThan(b.limit) {
		a.base = b.limit
	} else if a.base.lessThan(b.base) && b.base.lessThan(a.limit) {
		a.limit = b.base
	}
	return a
}

// takeFromFront takes len bytes from the front of the address range, aligning
// the base to align first. On success, returns the aligned start of the region
// taken and true.
func (a *addrRange) takeFromFront(len uintptr, align uint8) (uintptr, bool) {
	base := alignUp(a.base.addr(), uintptr(align)) + len
	if base > a.limit.addr() {
		return 0, false
	}
	a.base = offAddr{base}
	return base - len, true
}

// takeFromBack takes len bytes from the end of the address range, aligning
// the limit to align after subtracting len. On success, returns the aligned
// start of the region taken and true.
func (a *addrRange) takeFromBack(len uintptr, align uint8) (uintptr, bool) {
	limit := alignDown(a.limit.addr()-len, uintptr(align))
	if a.base.addr() > limit {
		return 0, false
	}
	a.limit = offAddr{limit}
	return limit, true
}

// removeGreaterEqual removes all addresses in a greater than or equal
// to addr and returns the new range.
func (a addrRange) removeGreaterEqual(addr uintptr) addrRange {
	if (offAddr{addr}).lessEqual(a.base) {
		return addrRange{}
	}
	if a.limit.lessEqual(offAddr{addr}) {
		return a
	}
	return makeAddrRange(a.base.addr(), addr)
}

var (
	// minOffAddr is the minimum address in the offset space, and
	// it corresponds to the virtual address arenaBaseOffset.
	minOffAddr = offAddr{arenaBaseOffset}

// maxOffAddr is the maximum address in the offset address
	// space. It corresponds to the highest virtual address representable
	// by the page alloc chunk and heap arena maps.
	maxOffAddr = offAddr{(((1 << heapAddrBits) - 1) + arenaBaseOffset) & uintptrMask}
)

// offAddr represents an address in a contiguous view
// of the address space on systems where the address space is
// segmented. On other systems, it's just a normal address.
type offAddr struct {
	// a is just the virtual address, but should never be used
	// directly. Call addr() to get this value instead.
	a uintptr
}

// add adds a uintptr offset to the offAddr.
func (l offAddr) add(bytes uintptr) offAddr {
	return offAddr{a: l.a + bytes}
}

// sub subtracts a uintptr offset from the offAddr.
func (l offAddr) sub(bytes uintptr) offAddr {
	return offAddr{a: l.a - bytes}
}

// diff returns the amount of bytes in between the
// two offAddrs.
func (l1 offAddr) diff(l2 offAddr) uintptr {
	return l1.a - l2.a
}

// lessThan returns true if l1 is less than l2 in the offset
// address space.
func (l1 offAddr) lessThan(l2 offAddr) bool {
	return (l1.a - arenaBaseOffset) < (l2.a - arenaBaseOffset)
}

// lessEqual returns true if l1 is less than or equal to l2 in
// the offset address space.
func (l1 offAddr) lessEqual(l2 offAddr) bool {
	return (l1.a - arenaBaseOffset) <= (l2.a - arenaBaseOffset)
}

// equal returns true if the two offAddr values are equal.
func (l1 offAddr) equal(l2 offAddr) bool {
	// No need to compare in the offset space, it
	// means the same thing.
	return l1 == l2
}

// addr returns the virtual address for this offset address.
func (l offAddr) addr() uintptr {
	return l.a
}

// atomicOffAddr is like offAddr, but operations on it are atomic.
// It also contains operations to be able to store marked addresses
// to ensure that they're not overridden until they've been seen.
type atomicOffAddr struct {
	// a contains the offset address, unlike offAddr.
	a atomic.Int64
}

// Clear attempts to store minOffAddr in atomicOffAddr. It may fail
// if a marked value is placed in the box in the meanwhile.
func (b *atomicOffAddr) Clear() {
	for {
		old := b.a.Load()
		if old < 0 {
			return
		}
		if b.a.CompareAndSwap(old, int64(minOffAddr.addr()-arenaBaseOffset)) {
			return
		}
	}
}

// StoreMin stores addr if it's less than the current value in the
// offset address space if the current value is not marked.
func (b *atomicOffAddr) StoreMin(addr uintptr) {
	new := int64(addr - arenaBaseOffset)
	for {
		old := b.a.Load()
		if old < new {
			return
		}
		if b.a.CompareAndSwap(old, new) {
			return
		}
	}
}

// StoreUnmark attempts to unmark the value in atomicOffAddr and
// replace it with newAddr. markedAddr must be a marked address
// returned by Load. This function will not store newAddr if the
// box no longer contains markedAddr.
func (b *atomicOffAddr) StoreUnmark(markedAddr, newAddr uintptr) {
	b.a.CompareAndSwap(-int64(markedAddr-arenaBaseOffset), int64(newAddr-arenaBaseOffset))
}

// StoreMarked stores addr but first converted to the offset address
// space and then negated.
func (b *atomicOffAddr) StoreMarked(addr uintptr) {
	b.a.Store(-int64(addr - arenaBaseOffset))
}

// Load returns the address in the box as a virtual address. It also
// returns if the value was marked or not.
func (b *atomicOffAddr) Load() (uintptr, bool) {
	v := b.a.Load()
	wasMarked := false
	if v < 0 {
		wasMarked = true
		v = -v
	}
	return uintptr(v) + arenaBaseOffset, wasMarked
}

// addrRanges is a data structure holding a collection of ranges of
// address space.
//
// The ranges are coalesced eagerly to reduce the
// number ranges it holds.
//
// The slice backing store for this field is persistentalloc'd
// and thus there is no way to free it.
//
// addrRanges is not thread-safe.
type addrRanges struct {
	// ranges is a slice of ranges sorted by base.
	ranges []addrRange

// totalBytes is the total amount of address space in bytes counted by
	// this addrRanges.
	totalBytes uintptr

// sysStat is the stat to track allocations by this type
	sysStat *sysMemStat
}

func (a *addrRanges) init(sysStat *sysMemStat) {
	ranges := (*notInHeapSlice)(unsafe.Pointer(&a.ranges))
	ranges.len = 0
	ranges.cap = 16
	ranges.array = (*notInHeap)(persistentalloc(unsafe.Sizeof(addrRange{})*uintptr(ranges.cap), goarch.PtrSize, sysStat))
	a.sysStat = sysStat
	a.totalBytes = 0
}

// findSucc returns the first index in a such that addr is
// less than the base of the addrRange at that index.
func (a *addrRanges) findSucc(addr uintptr) int {
	base := offAddr{addr}

// Narrow down the search space via a binary search
	// for large addrRanges until we have at most iterMax
	// candidates left.
	const iterMax = 8
	bot, top := 0, len(a.ranges)
	for top-bot > iterMax {
		i := int(uint(bot+top) >> 1)
		if a.ranges[i].contains(base.addr()) {
			// a.ranges[i] contains base, so
			// its successor is the next index.
			return i + 1
		}
		if base.lessThan(a.ranges[i].base) {
			// In this case i might actually be
			// the successor, but we can't be sure
			// until we check the ones before it.
			top = i
		} else {
			// In this case we know base is
			// greater than or equal to a.ranges[i].limit-1,
			// so i is definitely not the successor.
			// We already checked i, so pick the next
			// one.
			bot = i + 1
		}
	}
	// There are top-bot candidates left, so
	// iterate over them and find the first that
	// base is strictly less than.
	for i := bot; i < top; i++ {
		if base.lessThan(a.ranges[i].base) {
			return i
		}
	}
	return top
}

// findAddrGreaterEqual returns the smallest address represented by a
// that is >= addr. Thus, if the address is represented by a,
// then it returns addr. The second return value indicates whether
// such an address exists for addr in a. That is, if addr is larger than
// any address known to a, the second return value will be false.
func (a *addrRanges) findAddrGreaterEqual(addr uintptr) (uintptr, bool) {
	i := a.findSucc(addr)
	if i == 0 {
		return a.ranges[0].base.addr(), true
	}
	if a.ranges[i-1].contains(addr) {
		return addr, true
	}
	if i < len(a.ranges) {
		return a.ranges[i].base.addr(), true
	}
	return 0, false
}

// contains returns true if a covers the address addr.
func (a *addrRanges) contains(addr uintptr) bool {
	i := a.findSucc(addr)
	if i == 0 {
		return false
	}
	return a.ranges[i-1].contains(addr)
}

// add inserts a new address range to a.
//
// r must not overlap with any address range in a and r.size() must be > 0.
func (a *addrRanges) add(r addrRange) {
	// The copies in this function are potentially expensive, but this data
	// structure is meant to represent the Go heap. At worst, copying this
	// would take ~160µs assuming a conservative copying rate of 25 GiB/s (the
	// copy will almost never trigger a page fault) for a 1 TiB heap with 4 MiB
	// arenas which is completely discontiguous. ~160µs is still a lot, but in
	// practice most platforms have 64 MiB arenas (which cuts this by a factor
	// of 16) and Go heaps are usually mostly contiguous, so the chance that
	// an addrRanges even grows to that size is extremely low.

// An empty range has no effect on the set of addresses represented
	// by a, but passing a zero-sized range is almost always a bug.
	if r.size() == 0 {
		print("runtime: range = {", hex(r.base.addr()), ", ", hex(r.limit.addr()), "}\n")
		throw("attempted to add zero-sized address range")
	}
	// Because we assume r is not currently represented in a,
	// findSucc gives us our insertion index.
	i := a.findSucc(r.base.addr())
	coalescesDown := i > 0 && a.ranges[i-1].limit.equal(r.base)
	coalescesUp := i < len(a.ranges) && r.limit.equal(a.ranges[i].base)
	if coalescesUp && coalescesDown {
		// We have neighbors and they both border us.
		// Merge a.ranges[i-1], r, and a.ranges[i] together into a.ranges[i-1].
		a.ranges[i-1].limit = a.ranges[i].limit

// Delete a.ranges[i].
		copy(a.ranges[i:], a.ranges[i+1:])
		a.ranges = a.ranges[:len(a.ranges)-1]
	} else if coalescesDown {
		// We have a neighbor at a lower address only and it borders us.
		// Merge the new space into a.ranges[i-1].
		a.ranges[i-1].limit = r.limit
	} else if coalescesUp {
		// We have a neighbor at a higher address only and it borders us.
		// Merge the new space into a.ranges[i].
		a.ranges[i].base = r.base
	} else {
		// We may or may not have neighbors which don't border us.
		// Add the new range.
		if len(a.ranges)+1 > cap(a.ranges) {
			// Grow the array. Note that this leaks the old array, but since
			// we're doubling we have at most 2x waste. For a 1 TiB heap and
			// 4 MiB arenas which are all discontiguous (both very conservative
			// assumptions), this would waste at most 4 MiB of memory.
			oldRanges := a.ranges
			ranges := (*notInHeapSlice)(unsafe.Pointer(&a.ranges))
			ranges.len = len(oldRanges) + 1
			ranges.cap = cap(oldRanges) * 2
			ranges.array = (*notInHeap)(persistentalloc(unsafe.Sizeof(addrRange{})*uintptr(ranges.cap), goarch.PtrSize, a.sysStat))

// Copy in the old array, but make space for the new range.
			copy(a.ranges[:i], oldRanges[:i])
			copy(a.ranges[i+1:], oldRanges[i:])
		} else {
			a.ranges = a.ranges[:len(a.ranges)+1]
			copy(a.ranges[i+1:], a.ranges[i:])
		}
		a.ranges[i] = r
	}
	a.totalBytes += r.size()
}

// removeLast removes and returns the highest-addressed contiguous range
// of a, or the last nBytes of that range, whichever is smaller. If a is
// empty, it returns an empty range.
func (a *addrRanges) removeLast(nBytes uintptr) addrRange {
	if len(a.ranges) == 0 {
		return addrRange{}
	}
	r := a.ranges[len(a.ranges)-1]
	size := r.size()
	if size > nBytes {
		newEnd := r.limit.sub(nBytes)
		a.ranges[len(a.ranges)-1].limit = newEnd
		a.totalBytes -= nBytes
		return addrRange{newEnd, r.limit}
	}
	a.ranges = a.ranges[:len(a.ranges)-1]
	a.totalBytes -= size
	return r
}

// removeGreaterEqual removes the ranges of a which are above addr, and additionally
// splits any range containing addr.
func (a *addrRanges) removeGreaterEqual(addr uintptr) {
	pivot := a.findSucc(addr)
	if pivot == 0 {
		// addr is before all ranges in a.
		a.totalBytes = 0
		a.ranges = a.ranges[:0]
		return
	}
	removed := uintptr(0)
	for _, r := range a.ranges[pivot:] {
		removed += r.size()
	}
	if r := a.ranges[pivot-1]; r.contains(addr) {
		removed += r.size()
		r = r.removeGreaterEqual(addr)
		if r.size() == 0 {
			pivot--
		} else {
			removed -= r.size()
			a.ranges[pivot-1] = r
		}
	}
	a.ranges = a.ranges[:pivot]
	a.totalBytes -= removed
}

// cloneInto makes a deep clone of a's state into b, re-using
// b's ranges if able.
func (a *addrRanges) cloneInto(b *addrRanges) {
	if len(a.ranges) > cap(b.ranges) {
		// Grow the array.
		ranges := (*notInHeapSlice)(unsafe.Pointer(&b.ranges))
		ranges.len = 0
		ranges.cap = cap(a.ranges)
		ranges.array = (*notInHeap)(persistentalloc(unsafe.Sizeof(addrRange{})*uintptr(ranges.cap), goarch.PtrSize, b.sysStat))
	}
	b.ranges = b.ranges[:len(a.ranges)]
	b.totalBytes = a.totalBytes
	copy(b.ranges, a.ranges)
}

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