mirror of
https://github.com/golang/go
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cd17a717f9
Implement the design described in: https://docs.google.com/document/d/1v4Oqa0WwHunqlb8C3ObL_uNQw3DfSY-ztoA-4wWbKcg/pub Summary of the changes: GC uses "2-bits per word" pointer type info embed directly into bitmap. Scanning of stacks/data/heap is unified. The old spans types go away. Compiler generates "sparse" 4-bits type info for GC (directly for GC bitmap). Linker generates "dense" 2-bits type info for data/bss (the same as stacks use). Summary of results: -1680 lines of code total (-1000+ in mgc0.c only) -25% memory consumption -3-7% binary size -15% GC pause reduction -7% run time reduction LGTM=khr R=golang-codereviews, rsc, christoph, khr CC=golang-codereviews, rlh https://golang.org/cl/106260045
306 lines
6.6 KiB
C
306 lines
6.6 KiB
C
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Implementation of the race detector API.
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// +build race
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#include "runtime.h"
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#include "arch_GOARCH.h"
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#include "malloc.h"
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#include "race.h"
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#include "type.h"
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#include "typekind.h"
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// Race runtime functions called via runtime·racecall.
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void __tsan_init(void);
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void __tsan_fini(void);
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void __tsan_map_shadow(void);
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void __tsan_finalizer_goroutine(void);
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void __tsan_go_start(void);
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void __tsan_go_end(void);
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void __tsan_malloc(void);
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void __tsan_acquire(void);
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void __tsan_release(void);
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void __tsan_release_merge(void);
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// Mimic what cmd/cgo would do.
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#pragma cgo_import_static __tsan_init
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#pragma cgo_import_static __tsan_fini
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#pragma cgo_import_static __tsan_map_shadow
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#pragma cgo_import_static __tsan_finalizer_goroutine
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#pragma cgo_import_static __tsan_go_start
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#pragma cgo_import_static __tsan_go_end
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#pragma cgo_import_static __tsan_malloc
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#pragma cgo_import_static __tsan_acquire
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#pragma cgo_import_static __tsan_release
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#pragma cgo_import_static __tsan_release_merge
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// These are called from race_amd64.s.
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#pragma cgo_import_static __tsan_read
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#pragma cgo_import_static __tsan_read_pc
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#pragma cgo_import_static __tsan_read_range
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#pragma cgo_import_static __tsan_write
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#pragma cgo_import_static __tsan_write_pc
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#pragma cgo_import_static __tsan_write_range
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#pragma cgo_import_static __tsan_func_enter
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#pragma cgo_import_static __tsan_func_exit
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extern byte noptrdata[];
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extern byte enoptrbss[];
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// start/end of heap for race_amd64.s
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uintptr runtime·racearenastart;
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uintptr runtime·racearenaend;
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void runtime·racefuncenter(void *callpc);
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void runtime·racefuncexit(void);
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void runtime·racereadrangepc1(void *addr, uintptr sz, void *pc);
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void runtime·racewriterangepc1(void *addr, uintptr sz, void *pc);
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void runtime·racesymbolizethunk(void*);
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// racecall allows calling an arbitrary function f from C race runtime
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// with up to 4 uintptr arguments.
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void runtime·racecall(void(*f)(void), ...);
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// checks if the address has shadow (i.e. heap or data/bss)
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static bool
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isvalidaddr(uintptr addr)
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{
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if(addr >= runtime·racearenastart && addr < runtime·racearenaend)
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return true;
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if(addr >= (uintptr)noptrdata && addr < (uintptr)enoptrbss)
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return true;
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return false;
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}
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uintptr
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runtime·raceinit(void)
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{
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uintptr racectx, start, size;
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// cgo is required to initialize libc, which is used by race runtime
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if(!runtime·iscgo)
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runtime·throw("raceinit: race build must use cgo");
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runtime·racecall(__tsan_init, &racectx, runtime·racesymbolizethunk);
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// Round data segment to page boundaries, because it's used in mmap().
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start = (uintptr)noptrdata & ~(PageSize-1);
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size = ROUND((uintptr)enoptrbss - start, PageSize);
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runtime·racecall(__tsan_map_shadow, start, size);
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return racectx;
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}
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void
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runtime·racefini(void)
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{
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runtime·racecall(__tsan_fini);
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}
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void
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runtime·racemapshadow(void *addr, uintptr size)
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{
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if(runtime·racearenastart == 0)
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runtime·racearenastart = (uintptr)addr;
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if(runtime·racearenaend < (uintptr)addr+size)
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runtime·racearenaend = (uintptr)addr+size;
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runtime·racecall(__tsan_map_shadow, addr, size);
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}
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void
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runtime·racemalloc(void *p, uintptr sz)
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{
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runtime·racecall(__tsan_malloc, p, sz);
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}
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uintptr
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runtime·racegostart(void *pc)
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{
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uintptr racectx;
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runtime·racecall(__tsan_go_start, g->racectx, &racectx, pc);
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return racectx;
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}
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void
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runtime·racegoend(void)
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{
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runtime·racecall(__tsan_go_end, g->racectx);
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}
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void
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runtime·racewriterangepc(void *addr, uintptr sz, void *callpc, void *pc)
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{
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if(callpc != nil)
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runtime·racefuncenter(callpc);
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runtime·racewriterangepc1(addr, sz, pc);
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if(callpc != nil)
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runtime·racefuncexit();
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}
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void
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runtime·racereadrangepc(void *addr, uintptr sz, void *callpc, void *pc)
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{
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if(callpc != nil)
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runtime·racefuncenter(callpc);
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runtime·racereadrangepc1(addr, sz, pc);
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if(callpc != nil)
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runtime·racefuncexit();
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}
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void
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runtime·racewriteobjectpc(void *addr, Type *t, void *callpc, void *pc)
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{
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uint8 kind;
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kind = t->kind & KindMask;
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if(kind == KindArray || kind == KindStruct)
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runtime·racewriterangepc(addr, t->size, callpc, pc);
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else
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runtime·racewritepc(addr, callpc, pc);
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}
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void
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runtime·racereadobjectpc(void *addr, Type *t, void *callpc, void *pc)
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{
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uint8 kind;
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kind = t->kind & KindMask;
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if(kind == KindArray || kind == KindStruct)
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runtime·racereadrangepc(addr, t->size, callpc, pc);
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else
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runtime·racereadpc(addr, callpc, pc);
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}
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void
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runtime·raceacquire(void *addr)
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{
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runtime·raceacquireg(g, addr);
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}
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void
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runtime·raceacquireg(G *gp, void *addr)
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{
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if(g->raceignore || !isvalidaddr((uintptr)addr))
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return;
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runtime·racecall(__tsan_acquire, gp->racectx, addr);
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}
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void
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runtime·racerelease(void *addr)
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{
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if(g->raceignore || !isvalidaddr((uintptr)addr))
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return;
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runtime·racereleaseg(g, addr);
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}
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void
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runtime·racereleaseg(G *gp, void *addr)
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{
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if(g->raceignore || !isvalidaddr((uintptr)addr))
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return;
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runtime·racecall(__tsan_release, gp->racectx, addr);
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}
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void
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runtime·racereleasemerge(void *addr)
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{
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runtime·racereleasemergeg(g, addr);
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}
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void
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runtime·racereleasemergeg(G *gp, void *addr)
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{
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if(g->raceignore || !isvalidaddr((uintptr)addr))
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return;
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runtime·racecall(__tsan_release_merge, gp->racectx, addr);
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}
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void
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runtime·racefingo(void)
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{
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runtime·racecall(__tsan_finalizer_goroutine, g->racectx);
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}
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// func RaceAcquire(addr unsafe.Pointer)
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void
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runtime·RaceAcquire(void *addr)
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{
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runtime·raceacquire(addr);
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}
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// func RaceRelease(addr unsafe.Pointer)
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void
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runtime·RaceRelease(void *addr)
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{
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runtime·racerelease(addr);
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}
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// func RaceReleaseMerge(addr unsafe.Pointer)
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void
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runtime·RaceReleaseMerge(void *addr)
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{
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runtime·racereleasemerge(addr);
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}
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// func RaceSemacquire(s *uint32)
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void
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runtime·RaceSemacquire(uint32 *s)
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{
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runtime·semacquire(s, false);
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}
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// func RaceSemrelease(s *uint32)
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void
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runtime·RaceSemrelease(uint32 *s)
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{
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runtime·semrelease(s);
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}
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// func RaceDisable()
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void
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runtime·RaceDisable(void)
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{
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g->raceignore++;
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}
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// func RaceEnable()
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void
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runtime·RaceEnable(void)
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{
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g->raceignore--;
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}
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typedef struct SymbolizeContext SymbolizeContext;
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struct SymbolizeContext
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{
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uintptr pc;
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int8* func;
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int8* file;
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uintptr line;
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uintptr off;
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uintptr res;
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};
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// Callback from C into Go, runs on g0.
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void
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runtime·racesymbolize(SymbolizeContext *ctx)
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{
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Func *f;
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String file;
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f = runtime·findfunc(ctx->pc);
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if(f == nil) {
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ctx->func = "??";
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ctx->file = "-";
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ctx->line = 0;
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ctx->off = ctx->pc;
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ctx->res = 1;
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return;
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}
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ctx->func = runtime·funcname(f);
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ctx->line = runtime·funcline(f, ctx->pc, &file);
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ctx->file = (int8*)file.str; // assume zero-terminated
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ctx->off = ctx->pc - f->entry;
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ctx->res = 1;
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}
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