777 lines
17 KiB
C
777 lines
17 KiB
C
// Copyright 2014 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 runtime/debug.WriteHeapDump. Writes all
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// objects in the heap plus additional info (roots, threads,
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// finalizers, etc.) to a file.
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// The format of the dumped file is described at
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// http://code.google.com/p/go-wiki/wiki/heapdump13
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#include "runtime.h"
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#include "arch.h"
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#include "malloc.h"
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#include "mgc0.h"
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#include "go-type.h"
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#include "go-defer.h"
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#include "go-panic.h"
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#define hash __hash
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#define KindNoPointers GO_NO_POINTERS
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enum {
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FieldKindEol = 0,
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FieldKindPtr = 1,
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FieldKindString = 2,
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FieldKindSlice = 3,
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FieldKindIface = 4,
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FieldKindEface = 5,
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TagEOF = 0,
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TagObject = 1,
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TagOtherRoot = 2,
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TagType = 3,
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TagGoRoutine = 4,
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TagStackFrame = 5,
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TagParams = 6,
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TagFinalizer = 7,
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TagItab = 8,
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TagOSThread = 9,
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TagMemStats = 10,
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TagQueuedFinalizer = 11,
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TagData = 12,
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TagBss = 13,
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TagDefer = 14,
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TagPanic = 15,
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TagMemProf = 16,
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TagAllocSample = 17,
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TypeInfo_Conservative = 127,
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};
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// static uintptr* playgcprog(uintptr offset, uintptr *prog, void (*callback)(void*,uintptr,uintptr), void *arg);
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// static void dumpfields(uintptr *prog);
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static void dumpefacetypes(void *obj, uintptr size, const Type *type, uintptr kind);
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// fd to write the dump to.
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static uintptr dumpfd;
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// buffer of pending write data
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enum {
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BufSize = 4096,
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};
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static byte buf[BufSize];
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static uintptr nbuf;
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static void
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hwrite(const byte *data, uintptr len)
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{
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if(len + nbuf <= BufSize) {
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runtime_memmove(buf + nbuf, data, len);
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nbuf += len;
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return;
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}
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runtime_write(dumpfd, buf, nbuf);
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if(len >= BufSize) {
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runtime_write(dumpfd, data, len);
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nbuf = 0;
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} else {
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runtime_memmove(buf, data, len);
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nbuf = len;
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}
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}
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static void
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flush(void)
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{
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runtime_write(dumpfd, buf, nbuf);
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nbuf = 0;
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}
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// Cache of types that have been serialized already.
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// We use a type's hash field to pick a bucket.
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// Inside a bucket, we keep a list of types that
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// have been serialized so far, most recently used first.
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// Note: when a bucket overflows we may end up
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// serializing a type more than once. That's ok.
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enum {
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TypeCacheBuckets = 256, // must be a power of 2
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TypeCacheAssoc = 4,
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};
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typedef struct TypeCacheBucket TypeCacheBucket;
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struct TypeCacheBucket {
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const Type *t[TypeCacheAssoc];
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};
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static TypeCacheBucket typecache[TypeCacheBuckets];
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// dump a uint64 in a varint format parseable by encoding/binary
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static void
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dumpint(uint64 v)
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{
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byte buf[10];
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int32 n;
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n = 0;
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while(v >= 0x80) {
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buf[n++] = v | 0x80;
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v >>= 7;
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}
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buf[n++] = v;
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hwrite(buf, n);
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}
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static void
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dumpbool(bool b)
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{
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dumpint(b ? 1 : 0);
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}
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// dump varint uint64 length followed by memory contents
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static void
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dumpmemrange(const byte *data, uintptr len)
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{
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dumpint(len);
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hwrite(data, len);
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}
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static void
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dumpstr(String s)
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{
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dumpmemrange(s.str, s.len);
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}
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static void
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dumpcstr(const int8 *c)
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{
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dumpmemrange((const byte*)c, runtime_findnull((const byte*)c));
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}
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// dump information for a type
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static void
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dumptype(const Type *t)
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{
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TypeCacheBucket *b;
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int32 i, j;
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if(t == nil) {
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return;
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}
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// If we've definitely serialized the type before,
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// no need to do it again.
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b = &typecache[t->hash & (TypeCacheBuckets-1)];
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if(t == b->t[0]) return;
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for(i = 1; i < TypeCacheAssoc; i++) {
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if(t == b->t[i]) {
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// Move-to-front
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for(j = i; j > 0; j--) {
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b->t[j] = b->t[j-1];
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}
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b->t[0] = t;
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return;
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}
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}
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// Might not have been dumped yet. Dump it and
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// remember we did so.
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for(j = TypeCacheAssoc-1; j > 0; j--) {
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b->t[j] = b->t[j-1];
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}
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b->t[0] = t;
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// dump the type
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dumpint(TagType);
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dumpint((uintptr)t);
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dumpint(t->__size);
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if(t->__uncommon == nil || t->__uncommon->__pkg_path == nil || t->__uncommon->__name == nil) {
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dumpstr(*t->__reflection);
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} else {
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dumpint(t->__uncommon->__pkg_path->len + 1 + t->__uncommon->__name->len);
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hwrite(t->__uncommon->__pkg_path->str, t->__uncommon->__pkg_path->len);
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hwrite((const byte*)".", 1);
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hwrite(t->__uncommon->__name->str, t->__uncommon->__name->len);
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}
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dumpbool(t->__size > PtrSize || (t->__code & KindNoPointers) == 0);
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// dumpfields((uintptr*)t->gc + 1);
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}
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// returns true if object is scannable
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static bool
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scannable(byte *obj)
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{
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uintptr *b, off, shift;
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off = (uintptr*)obj - (uintptr*)runtime_mheap.arena_start; // word offset
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b = (uintptr*)runtime_mheap.arena_start - off/wordsPerBitmapWord - 1;
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shift = off % wordsPerBitmapWord;
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return ((*b >> shift) & bitScan) != 0;
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}
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// dump an object
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static void
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dumpobj(byte *obj, uintptr size, const Type *type, uintptr kind)
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{
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if(type != nil) {
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dumptype(type);
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dumpefacetypes(obj, size, type, kind);
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}
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dumpint(TagObject);
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dumpint((uintptr)obj);
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dumpint((uintptr)type);
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dumpint(kind);
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dumpmemrange(obj, size);
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}
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static void
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dumpotherroot(const char *description, byte *to)
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{
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dumpint(TagOtherRoot);
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dumpcstr((const int8 *)description);
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dumpint((uintptr)to);
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}
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static void
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dumpfinalizer(byte *obj, FuncVal *fn, const FuncType* ft, const PtrType *ot)
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{
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dumpint(TagFinalizer);
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dumpint((uintptr)obj);
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dumpint((uintptr)fn);
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dumpint((uintptr)fn->fn);
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dumpint((uintptr)ft);
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dumpint((uintptr)ot);
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}
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typedef struct ChildInfo ChildInfo;
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struct ChildInfo {
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// Information passed up from the callee frame about
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// the layout of the outargs region.
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uintptr argoff; // where the arguments start in the frame
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uintptr arglen; // size of args region
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BitVector args; // if args.n >= 0, pointer map of args region
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byte *sp; // callee sp
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uintptr depth; // depth in call stack (0 == most recent)
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};
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static void
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dumpgoroutine(G *gp)
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{
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// ChildInfo child;
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Defer *d;
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Panic *p;
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dumpint(TagGoRoutine);
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dumpint((uintptr)gp);
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dumpint((uintptr)0);
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dumpint(gp->goid);
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dumpint(gp->gopc);
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dumpint(gp->status);
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dumpbool(gp->issystem);
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dumpbool(gp->isbackground);
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dumpint(gp->waitsince);
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dumpcstr((const int8 *)gp->waitreason);
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dumpint((uintptr)0);
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dumpint((uintptr)gp->m);
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dumpint((uintptr)gp->defer);
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dumpint((uintptr)gp->panic);
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// dump stack
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// child.args.n = -1;
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// child.arglen = 0;
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// child.sp = nil;
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// child.depth = 0;
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// if(!ScanStackByFrames)
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// runtime_throw("need frame info to dump stacks");
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// runtime_gentraceback(pc, sp, lr, gp, 0, nil, 0x7fffffff, dumpframe, &child, false);
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// dump defer & panic records
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for(d = gp->defer; d != nil; d = d->__next) {
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dumpint(TagDefer);
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dumpint((uintptr)d);
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dumpint((uintptr)gp);
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dumpint((uintptr)d->__arg);
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dumpint((uintptr)d->__frame);
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dumpint((uintptr)d->__pfn);
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dumpint((uintptr)0);
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dumpint((uintptr)d->__next);
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}
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for (p = gp->panic; p != nil; p = p->__next) {
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dumpint(TagPanic);
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dumpint((uintptr)p);
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dumpint((uintptr)gp);
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dumpint((uintptr)p->__arg.__type_descriptor);
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dumpint((uintptr)p->__arg.__object);
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dumpint((uintptr)0);
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dumpint((uintptr)p->__next);
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}
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}
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static void
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dumpgs(void)
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{
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G *gp;
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uint32 i;
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// goroutines & stacks
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for(i = 0; i < runtime_allglen; i++) {
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gp = runtime_allg[i];
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switch(gp->status){
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default:
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runtime_printf("unexpected G.status %d\n", gp->status);
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runtime_throw("mark - bad status");
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case Gdead:
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break;
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case Grunnable:
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case Gsyscall:
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case Gwaiting:
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dumpgoroutine(gp);
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break;
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}
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}
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}
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static void
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finq_callback(FuncVal *fn, void *obj, const FuncType *ft, const PtrType *ot)
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{
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dumpint(TagQueuedFinalizer);
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dumpint((uintptr)obj);
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dumpint((uintptr)fn);
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dumpint((uintptr)fn->fn);
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dumpint((uintptr)ft);
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dumpint((uintptr)ot);
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}
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static void
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dumproots(void)
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{
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MSpan *s, **allspans;
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uint32 spanidx;
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Special *sp;
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SpecialFinalizer *spf;
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byte *p;
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// data segment
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// dumpint(TagData);
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// dumpint((uintptr)data);
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// dumpmemrange(data, edata - data);
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// dumpfields((uintptr*)gcdata + 1);
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// bss segment
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// dumpint(TagBss);
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// dumpint((uintptr)bss);
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// dumpmemrange(bss, ebss - bss);
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// dumpfields((uintptr*)gcbss + 1);
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// MSpan.types
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allspans = runtime_mheap.allspans;
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for(spanidx=0; spanidx<runtime_mheap.nspan; spanidx++) {
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s = allspans[spanidx];
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if(s->state == MSpanInUse) {
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// The garbage collector ignores type pointers stored in MSpan.types:
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// - Compiler-generated types are stored outside of heap.
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// - The reflect package has runtime-generated types cached in its data structures.
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// The garbage collector relies on finding the references via that cache.
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switch(s->types.compression) {
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case MTypes_Empty:
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case MTypes_Single:
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break;
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case MTypes_Words:
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case MTypes_Bytes:
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dumpotherroot("runtime type info", (byte*)s->types.data);
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break;
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}
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// Finalizers
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for(sp = s->specials; sp != nil; sp = sp->next) {
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if(sp->kind != KindSpecialFinalizer)
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continue;
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spf = (SpecialFinalizer*)sp;
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p = (byte*)((s->start << PageShift) + spf->offset);
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dumpfinalizer(p, spf->fn, spf->ft, spf->ot);
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}
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}
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}
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// Finalizer queue
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runtime_iterate_finq(finq_callback);
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}
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// Bit vector of free marks.
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// Needs to be as big as the largest number of objects per span.
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static byte hfree[PageSize/8];
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static void
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dumpobjs(void)
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{
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uintptr i, j, size, n, off, shift, *bitp, bits, ti, kind;
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MSpan *s;
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MLink *l;
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byte *p;
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const Type *t;
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for(i = 0; i < runtime_mheap.nspan; i++) {
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s = runtime_mheap.allspans[i];
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if(s->state != MSpanInUse)
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continue;
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p = (byte*)(s->start << PageShift);
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size = s->elemsize;
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n = (s->npages << PageShift) / size;
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if(n > PageSize/8)
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runtime_throw("free array doesn't have enough entries");
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for(l = s->freelist; l != nil; l = l->next) {
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hfree[((byte*)l - p) / size] = true;
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}
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for(j = 0; j < n; j++, p += size) {
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if(hfree[j]) {
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hfree[j] = false;
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continue;
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}
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off = (uintptr*)p - (uintptr*)runtime_mheap.arena_start;
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bitp = (uintptr*)runtime_mheap.arena_start - off/wordsPerBitmapWord - 1;
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shift = off % wordsPerBitmapWord;
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bits = *bitp >> shift;
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// Skip FlagNoGC allocations (stacks)
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if((bits & bitAllocated) == 0)
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continue;
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// extract type and kind
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ti = runtime_gettype(p);
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t = (Type*)(ti & ~(uintptr)(PtrSize-1));
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kind = ti & (PtrSize-1);
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// dump it
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if(kind == TypeInfo_Chan)
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t = ((const ChanType*)t)->__element_type; // use element type for chan encoding
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if(t == nil && scannable(p))
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kind = TypeInfo_Conservative; // special kind for conservatively scanned objects
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dumpobj(p, size, t, kind);
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}
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}
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}
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static void
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dumpparams(void)
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{
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byte *x;
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dumpint(TagParams);
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x = (byte*)1;
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if(*(byte*)&x == 1)
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dumpbool(false); // little-endian ptrs
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else
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dumpbool(true); // big-endian ptrs
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dumpint(PtrSize);
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dumpint(runtime_Hchansize);
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dumpint((uintptr)runtime_mheap.arena_start);
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dumpint((uintptr)runtime_mheap.arena_used);
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dumpint(0);
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dumpcstr((const int8 *)"");
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dumpint(runtime_ncpu);
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}
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static void
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dumpms(void)
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{
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M *mp;
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for(mp = runtime_allm; mp != nil; mp = mp->alllink) {
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dumpint(TagOSThread);
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dumpint((uintptr)mp);
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dumpint(mp->id);
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dumpint(0);
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}
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}
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static void
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dumpmemstats(void)
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{
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int32 i;
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dumpint(TagMemStats);
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dumpint(mstats.alloc);
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dumpint(mstats.total_alloc);
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dumpint(mstats.sys);
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dumpint(mstats.nlookup);
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dumpint(mstats.nmalloc);
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dumpint(mstats.nfree);
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dumpint(mstats.heap_alloc);
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dumpint(mstats.heap_sys);
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dumpint(mstats.heap_idle);
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dumpint(mstats.heap_inuse);
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dumpint(mstats.heap_released);
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dumpint(mstats.heap_objects);
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dumpint(mstats.stacks_inuse);
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dumpint(mstats.stacks_sys);
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dumpint(mstats.mspan_inuse);
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dumpint(mstats.mspan_sys);
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dumpint(mstats.mcache_inuse);
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dumpint(mstats.mcache_sys);
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dumpint(mstats.buckhash_sys);
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dumpint(mstats.gc_sys);
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dumpint(mstats.other_sys);
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dumpint(mstats.next_gc);
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dumpint(mstats.last_gc);
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dumpint(mstats.pause_total_ns);
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for(i = 0; i < 256; i++)
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dumpint(mstats.pause_ns[i]);
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dumpint(mstats.numgc);
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}
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static void
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dumpmemprof_callback(Bucket *b, uintptr nstk, Location *stk, uintptr size, uintptr allocs, uintptr frees)
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{
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uintptr i, pc;
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byte buf[20];
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dumpint(TagMemProf);
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dumpint((uintptr)b);
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dumpint(size);
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dumpint(nstk);
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for(i = 0; i < nstk; i++) {
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pc = stk[i].pc;
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if(stk[i].function.len == 0) {
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runtime_snprintf(buf, sizeof(buf), "%X", (uint64)pc);
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dumpcstr((int8*)buf);
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dumpcstr((const int8*)"?");
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dumpint(0);
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} else {
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dumpstr(stk[i].function);
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dumpstr(stk[i].filename);
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dumpint(stk[i].lineno);
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}
|
|
}
|
|
dumpint(allocs);
|
|
dumpint(frees);
|
|
}
|
|
|
|
static void
|
|
dumpmemprof(void)
|
|
{
|
|
MSpan *s, **allspans;
|
|
uint32 spanidx;
|
|
Special *sp;
|
|
SpecialProfile *spp;
|
|
byte *p;
|
|
|
|
runtime_iterate_memprof(dumpmemprof_callback);
|
|
|
|
allspans = runtime_mheap.allspans;
|
|
for(spanidx=0; spanidx<runtime_mheap.nspan; spanidx++) {
|
|
s = allspans[spanidx];
|
|
if(s->state != MSpanInUse)
|
|
continue;
|
|
for(sp = s->specials; sp != nil; sp = sp->next) {
|
|
if(sp->kind != KindSpecialProfile)
|
|
continue;
|
|
spp = (SpecialProfile*)sp;
|
|
p = (byte*)((s->start << PageShift) + spp->offset);
|
|
dumpint(TagAllocSample);
|
|
dumpint((uintptr)p);
|
|
dumpint((uintptr)spp->b);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
mdump(G *gp)
|
|
{
|
|
const byte *hdr;
|
|
uintptr i;
|
|
MSpan *s;
|
|
|
|
// make sure we're done sweeping
|
|
for(i = 0; i < runtime_mheap.nspan; i++) {
|
|
s = runtime_mheap.allspans[i];
|
|
if(s->state == MSpanInUse)
|
|
runtime_MSpan_EnsureSwept(s);
|
|
}
|
|
|
|
runtime_memclr((byte*)&typecache[0], sizeof(typecache));
|
|
hdr = (const byte*)"go1.3 heap dump\n";
|
|
hwrite(hdr, runtime_findnull(hdr));
|
|
dumpparams();
|
|
dumpobjs();
|
|
dumpgs();
|
|
dumpms();
|
|
dumproots();
|
|
dumpmemstats();
|
|
dumpmemprof();
|
|
dumpint(TagEOF);
|
|
flush();
|
|
|
|
gp->param = nil;
|
|
gp->status = Grunning;
|
|
runtime_gogo(gp);
|
|
}
|
|
|
|
void runtime_debug_WriteHeapDump(uintptr)
|
|
__asm__(GOSYM_PREFIX "runtime_debug.WriteHeapDump");
|
|
|
|
void
|
|
runtime_debug_WriteHeapDump(uintptr fd)
|
|
{
|
|
M *m;
|
|
G *g;
|
|
|
|
// Stop the world.
|
|
runtime_semacquire(&runtime_worldsema, false);
|
|
m = runtime_m();
|
|
m->gcing = 1;
|
|
m->locks++;
|
|
runtime_stoptheworld();
|
|
|
|
// Update stats so we can dump them.
|
|
// As a side effect, flushes all the MCaches so the MSpan.freelist
|
|
// lists contain all the free objects.
|
|
runtime_updatememstats(nil);
|
|
|
|
// Set dump file.
|
|
dumpfd = fd;
|
|
|
|
// Call dump routine on M stack.
|
|
g = runtime_g();
|
|
g->status = Gwaiting;
|
|
g->waitreason = "dumping heap";
|
|
runtime_mcall(mdump);
|
|
|
|
// Reset dump file.
|
|
dumpfd = 0;
|
|
|
|
// Start up the world again.
|
|
m->gcing = 0;
|
|
runtime_semrelease(&runtime_worldsema);
|
|
runtime_starttheworld();
|
|
m->locks--;
|
|
}
|
|
|
|
// Runs the specified gc program. Calls the callback for every
|
|
// pointer-like field specified by the program and passes to the
|
|
// callback the kind and offset of that field within the object.
|
|
// offset is the offset in the object of the start of the program.
|
|
// Returns a pointer to the opcode that ended the gc program (either
|
|
// GC_END or GC_ARRAY_NEXT).
|
|
/*
|
|
static uintptr*
|
|
playgcprog(uintptr offset, uintptr *prog, void (*callback)(void*,uintptr,uintptr), void *arg)
|
|
{
|
|
uintptr len, elemsize, i, *end;
|
|
|
|
for(;;) {
|
|
switch(prog[0]) {
|
|
case GC_END:
|
|
return prog;
|
|
case GC_PTR:
|
|
callback(arg, FieldKindPtr, offset + prog[1]);
|
|
prog += 3;
|
|
break;
|
|
case GC_APTR:
|
|
callback(arg, FieldKindPtr, offset + prog[1]);
|
|
prog += 2;
|
|
break;
|
|
case GC_ARRAY_START:
|
|
len = prog[2];
|
|
elemsize = prog[3];
|
|
end = nil;
|
|
for(i = 0; i < len; i++) {
|
|
end = playgcprog(offset + prog[1] + i * elemsize, prog + 4, callback, arg);
|
|
if(end[0] != GC_ARRAY_NEXT)
|
|
runtime_throw("GC_ARRAY_START did not have matching GC_ARRAY_NEXT");
|
|
}
|
|
prog = end + 1;
|
|
break;
|
|
case GC_ARRAY_NEXT:
|
|
return prog;
|
|
case GC_CALL:
|
|
playgcprog(offset + prog[1], (uintptr*)((byte*)prog + *(int32*)&prog[2]), callback, arg);
|
|
prog += 3;
|
|
break;
|
|
case GC_CHAN_PTR:
|
|
callback(arg, FieldKindPtr, offset + prog[1]);
|
|
prog += 3;
|
|
break;
|
|
case GC_STRING:
|
|
callback(arg, FieldKindString, offset + prog[1]);
|
|
prog += 2;
|
|
break;
|
|
case GC_EFACE:
|
|
callback(arg, FieldKindEface, offset + prog[1]);
|
|
prog += 2;
|
|
break;
|
|
case GC_IFACE:
|
|
callback(arg, FieldKindIface, offset + prog[1]);
|
|
prog += 2;
|
|
break;
|
|
case GC_SLICE:
|
|
callback(arg, FieldKindSlice, offset + prog[1]);
|
|
prog += 3;
|
|
break;
|
|
case GC_REGION:
|
|
playgcprog(offset + prog[1], (uintptr*)prog[3] + 1, callback, arg);
|
|
prog += 4;
|
|
break;
|
|
default:
|
|
runtime_printf("%D\n", (uint64)prog[0]);
|
|
runtime_throw("bad gc op");
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
dump_callback(void *p, uintptr kind, uintptr offset)
|
|
{
|
|
USED(&p);
|
|
dumpint(kind);
|
|
dumpint(offset);
|
|
}
|
|
|
|
// dumpint() the kind & offset of each field in an object.
|
|
static void
|
|
dumpfields(uintptr *prog)
|
|
{
|
|
playgcprog(0, prog, dump_callback, nil);
|
|
dumpint(FieldKindEol);
|
|
}
|
|
|
|
static void
|
|
dumpeface_callback(void *p, uintptr kind, uintptr offset)
|
|
{
|
|
Eface *e;
|
|
|
|
if(kind != FieldKindEface)
|
|
return;
|
|
e = (Eface*)((byte*)p + offset);
|
|
dumptype(e->__type_descriptor);
|
|
}
|
|
*/
|
|
|
|
// The heap dump reader needs to be able to disambiguate
|
|
// Eface entries. So it needs to know every type that might
|
|
// appear in such an entry. The following two routines accomplish
|
|
// that.
|
|
|
|
// Dump all the types that appear in the type field of
|
|
// any Eface contained in obj.
|
|
static void
|
|
dumpefacetypes(void *obj __attribute__ ((unused)), uintptr size, const Type *type, uintptr kind)
|
|
{
|
|
uintptr i;
|
|
|
|
switch(kind) {
|
|
case TypeInfo_SingleObject:
|
|
//playgcprog(0, (uintptr*)type->gc + 1, dumpeface_callback, obj);
|
|
break;
|
|
case TypeInfo_Array:
|
|
for(i = 0; i <= size - type->__size; i += type->__size)
|
|
//playgcprog(i, (uintptr*)type->gc + 1, dumpeface_callback, obj);
|
|
break;
|
|
case TypeInfo_Chan:
|
|
if(type->__size == 0) // channels may have zero-sized objects in them
|
|
break;
|
|
for(i = runtime_Hchansize; i <= size - type->__size; i += type->__size)
|
|
//playgcprog(i, (uintptr*)type->gc + 1, dumpeface_callback, obj);
|
|
break;
|
|
}
|
|
}
|