836 lines
23 KiB
Plaintext
836 lines
23 KiB
Plaintext
// Copyright 2009 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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// See malloc.h for overview.
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//
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// TODO(rsc): double-check stats.
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package runtime
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#include <stddef.h>
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#include <errno.h>
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#include <stdlib.h>
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#include "go-alloc.h"
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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 "interface.h"
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#include "go-type.h"
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#include "race.h"
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// Map gccgo field names to gc field names.
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// Eface aka __go_empty_interface.
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#define type __type_descriptor
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// Type aka __go_type_descriptor
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#define kind __code
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#define string __reflection
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#define KindPtr GO_PTR
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#define KindNoPointers GO_NO_POINTERS
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// Mark mheap as 'no pointers', it does not contain interesting pointers but occupies ~45K.
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MHeap runtime_mheap;
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int32 runtime_checking;
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extern MStats mstats; // defined in zruntime_def_$GOOS_$GOARCH.go
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extern volatile intgo runtime_MemProfileRate
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__asm__ (GOSYM_PREFIX "runtime.MemProfileRate");
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// Allocate an object of at least size bytes.
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// Small objects are allocated from the per-thread cache's free lists.
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// Large objects (> 32 kB) are allocated straight from the heap.
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// If the block will be freed with runtime_free(), typ must be 0.
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void*
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runtime_mallocgc(uintptr size, uintptr typ, uint32 flag)
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{
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M *m;
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G *g;
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int32 sizeclass;
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intgo rate;
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MCache *c;
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MCacheList *l;
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uintptr npages;
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MSpan *s;
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MLink *v;
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bool incallback;
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if(size == 0) {
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// All 0-length allocations use this pointer.
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// The language does not require the allocations to
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// have distinct values.
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return &runtime_zerobase;
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}
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m = runtime_m();
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g = runtime_g();
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incallback = false;
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if(m->mcache == nil && g->ncgo > 0) {
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// For gccgo this case can occur when a cgo or SWIG function
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// has an interface return type and the function
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// returns a non-pointer, so memory allocation occurs
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// after syscall.Cgocall but before syscall.CgocallDone.
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// We treat it as a callback.
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runtime_exitsyscall();
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m = runtime_m();
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incallback = true;
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flag |= FlagNoInvokeGC;
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}
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if(runtime_gcwaiting() && g != m->g0 && m->locks == 0 && !(flag & FlagNoInvokeGC)) {
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runtime_gosched();
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m = runtime_m();
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}
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if(m->mallocing)
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runtime_throw("malloc/free - deadlock");
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// Disable preemption during settype_flush.
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// We can not use m->mallocing for this, because settype_flush calls mallocgc.
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m->locks++;
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m->mallocing = 1;
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if(DebugTypeAtBlockEnd)
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size += sizeof(uintptr);
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c = m->mcache;
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if(size <= MaxSmallSize) {
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// Allocate from mcache free lists.
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// Inlined version of SizeToClass().
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if(size <= 1024-8)
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sizeclass = runtime_size_to_class8[(size+7)>>3];
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else
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sizeclass = runtime_size_to_class128[(size-1024+127) >> 7];
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size = runtime_class_to_size[sizeclass];
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l = &c->list[sizeclass];
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if(l->list == nil)
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runtime_MCache_Refill(c, sizeclass);
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v = l->list;
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l->list = v->next;
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l->nlist--;
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if(!(flag & FlagNoZero)) {
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v->next = nil;
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// block is zeroed iff second word is zero ...
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if(size > sizeof(uintptr) && ((uintptr*)v)[1] != 0)
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runtime_memclr((byte*)v, size);
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}
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c->local_cachealloc += size;
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} else {
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// TODO(rsc): Report tracebacks for very large allocations.
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// Allocate directly from heap.
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npages = size >> PageShift;
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if((size & PageMask) != 0)
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npages++;
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s = runtime_MHeap_Alloc(&runtime_mheap, npages, 0, 1, !(flag & FlagNoZero));
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if(s == nil)
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runtime_throw("out of memory");
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s->limit = (byte*)(s->start<<PageShift) + size;
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size = npages<<PageShift;
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v = (void*)(s->start << PageShift);
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// setup for mark sweep
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runtime_markspan(v, 0, 0, true);
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}
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if(!(flag & FlagNoGC))
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runtime_markallocated(v, size, (flag&FlagNoScan) != 0);
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if(DebugTypeAtBlockEnd)
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*(uintptr*)((uintptr)v+size-sizeof(uintptr)) = typ;
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// TODO: save type even if FlagNoScan? Potentially expensive but might help
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// heap profiling/tracing.
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if(UseSpanType && !(flag & FlagNoScan) && typ != 0) {
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uintptr *buf, i;
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buf = m->settype_buf;
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i = m->settype_bufsize;
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buf[i++] = (uintptr)v;
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buf[i++] = typ;
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m->settype_bufsize = i;
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}
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m->mallocing = 0;
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if(UseSpanType && !(flag & FlagNoScan) && typ != 0 && m->settype_bufsize == nelem(m->settype_buf))
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runtime_settype_flush(m);
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m->locks--;
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if(!(flag & FlagNoProfiling) && (rate = runtime_MemProfileRate) > 0) {
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if(size >= (uint32) rate)
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goto profile;
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if((uint32) m->mcache->next_sample > size)
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m->mcache->next_sample -= size;
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else {
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// pick next profile time
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// If you change this, also change allocmcache.
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if(rate > 0x3fffffff) // make 2*rate not overflow
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rate = 0x3fffffff;
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m->mcache->next_sample = runtime_fastrand1() % (2*rate);
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profile:
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runtime_setblockspecial(v, true);
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runtime_MProf_Malloc(v, size);
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}
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}
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if(!(flag & FlagNoInvokeGC) && mstats.heap_alloc >= mstats.next_gc)
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runtime_gc(0);
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if(raceenabled)
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runtime_racemalloc(v, size);
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if(incallback)
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runtime_entersyscall();
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return v;
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}
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void*
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__go_alloc(uintptr size)
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{
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return runtime_mallocgc(size, 0, FlagNoInvokeGC);
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}
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// Free the object whose base pointer is v.
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void
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__go_free(void *v)
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{
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M *m;
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int32 sizeclass;
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MSpan *s;
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MCache *c;
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uint32 prof;
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uintptr size;
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if(v == nil)
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return;
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// If you change this also change mgc0.c:/^sweep,
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// which has a copy of the guts of free.
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m = runtime_m();
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if(m->mallocing)
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runtime_throw("malloc/free - deadlock");
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m->mallocing = 1;
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if(!runtime_mlookup(v, nil, nil, &s)) {
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runtime_printf("free %p: not an allocated block\n", v);
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runtime_throw("free runtime_mlookup");
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}
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prof = runtime_blockspecial(v);
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if(raceenabled)
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runtime_racefree(v);
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// Find size class for v.
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sizeclass = s->sizeclass;
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c = m->mcache;
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if(sizeclass == 0) {
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// Large object.
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size = s->npages<<PageShift;
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*(uintptr*)(s->start<<PageShift) = (uintptr)0xfeedfeedfeedfeedll; // mark as "needs to be zeroed"
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// Must mark v freed before calling unmarkspan and MHeap_Free:
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// they might coalesce v into other spans and change the bitmap further.
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runtime_markfreed(v, size);
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runtime_unmarkspan(v, 1<<PageShift);
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runtime_MHeap_Free(&runtime_mheap, s, 1);
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c->local_nlargefree++;
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c->local_largefree += size;
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} else {
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// Small object.
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size = runtime_class_to_size[sizeclass];
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if(size > sizeof(uintptr))
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((uintptr*)v)[1] = (uintptr)0xfeedfeedfeedfeedll; // mark as "needs to be zeroed"
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// Must mark v freed before calling MCache_Free:
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// it might coalesce v and other blocks into a bigger span
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// and change the bitmap further.
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runtime_markfreed(v, size);
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c->local_nsmallfree[sizeclass]++;
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runtime_MCache_Free(c, v, sizeclass, size);
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}
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if(prof)
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runtime_MProf_Free(v, size);
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m->mallocing = 0;
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}
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int32
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runtime_mlookup(void *v, byte **base, uintptr *size, MSpan **sp)
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{
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M *m;
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uintptr n, i;
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byte *p;
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MSpan *s;
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m = runtime_m();
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m->mcache->local_nlookup++;
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if (sizeof(void*) == 4 && m->mcache->local_nlookup >= (1<<30)) {
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// purge cache stats to prevent overflow
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runtime_lock(&runtime_mheap);
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runtime_purgecachedstats(m->mcache);
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runtime_unlock(&runtime_mheap);
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}
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s = runtime_MHeap_LookupMaybe(&runtime_mheap, v);
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if(sp)
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*sp = s;
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if(s == nil) {
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runtime_checkfreed(v, 1);
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if(base)
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*base = nil;
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if(size)
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*size = 0;
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return 0;
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}
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p = (byte*)((uintptr)s->start<<PageShift);
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if(s->sizeclass == 0) {
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// Large object.
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if(base)
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*base = p;
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if(size)
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*size = s->npages<<PageShift;
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return 1;
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}
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n = s->elemsize;
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if(base) {
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i = ((byte*)v - p)/n;
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*base = p + i*n;
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}
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if(size)
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*size = n;
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return 1;
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}
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MCache*
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runtime_allocmcache(void)
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{
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intgo rate;
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MCache *c;
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runtime_lock(&runtime_mheap);
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c = runtime_FixAlloc_Alloc(&runtime_mheap.cachealloc);
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runtime_unlock(&runtime_mheap);
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runtime_memclr((byte*)c, sizeof(*c));
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// Set first allocation sample size.
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rate = runtime_MemProfileRate;
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if(rate > 0x3fffffff) // make 2*rate not overflow
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rate = 0x3fffffff;
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if(rate != 0)
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c->next_sample = runtime_fastrand1() % (2*rate);
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return c;
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}
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void
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runtime_freemcache(MCache *c)
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{
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runtime_MCache_ReleaseAll(c);
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runtime_lock(&runtime_mheap);
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runtime_purgecachedstats(c);
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runtime_FixAlloc_Free(&runtime_mheap.cachealloc, c);
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runtime_unlock(&runtime_mheap);
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}
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void
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runtime_purgecachedstats(MCache *c)
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{
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MHeap *h;
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int32 i;
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// Protected by either heap or GC lock.
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h = &runtime_mheap;
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mstats.heap_alloc += c->local_cachealloc;
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c->local_cachealloc = 0;
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mstats.nlookup += c->local_nlookup;
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c->local_nlookup = 0;
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h->largefree += c->local_largefree;
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c->local_largefree = 0;
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h->nlargefree += c->local_nlargefree;
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c->local_nlargefree = 0;
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for(i=0; i<(int32)nelem(c->local_nsmallfree); i++) {
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h->nsmallfree[i] += c->local_nsmallfree[i];
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c->local_nsmallfree[i] = 0;
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}
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}
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extern uintptr runtime_sizeof_C_MStats
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__asm__ (GOSYM_PREFIX "runtime.Sizeof_C_MStats");
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#define MaxArena32 (2U<<30)
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void
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runtime_mallocinit(void)
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{
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byte *p;
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uintptr arena_size, bitmap_size, spans_size;
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extern byte _end[];
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byte *want;
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uintptr limit;
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uint64 i;
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runtime_sizeof_C_MStats = sizeof(MStats);
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p = nil;
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arena_size = 0;
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bitmap_size = 0;
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spans_size = 0;
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// for 64-bit build
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USED(p);
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USED(arena_size);
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USED(bitmap_size);
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USED(spans_size);
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runtime_InitSizes();
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// limit = runtime_memlimit();
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// See https://code.google.com/p/go/issues/detail?id=5049
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// TODO(rsc): Fix after 1.1.
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limit = 0;
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// Set up the allocation arena, a contiguous area of memory where
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// allocated data will be found. The arena begins with a bitmap large
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// enough to hold 4 bits per allocated word.
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if(sizeof(void*) == 8 && (limit == 0 || limit > (1<<30))) {
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// On a 64-bit machine, allocate from a single contiguous reservation.
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// 128 GB (MaxMem) should be big enough for now.
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//
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// The code will work with the reservation at any address, but ask
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// SysReserve to use 0x0000XXc000000000 if possible (XX=00...7f).
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// Allocating a 128 GB region takes away 37 bits, and the amd64
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// doesn't let us choose the top 17 bits, so that leaves the 11 bits
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// in the middle of 0x00c0 for us to choose. Choosing 0x00c0 means
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// that the valid memory addresses will begin 0x00c0, 0x00c1, ..., 0x00df.
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// In little-endian, that's c0 00, c1 00, ..., df 00. None of those are valid
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// UTF-8 sequences, and they are otherwise as far away from
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// ff (likely a common byte) as possible. If that fails, we try other 0xXXc0
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// addresses. An earlier attempt to use 0x11f8 caused out of memory errors
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// on OS X during thread allocations. 0x00c0 causes conflicts with
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// AddressSanitizer which reserves all memory up to 0x0100.
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// These choices are both for debuggability and to reduce the
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// odds of the conservative garbage collector not collecting memory
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// because some non-pointer block of memory had a bit pattern
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// that matched a memory address.
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//
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// Actually we reserve 136 GB (because the bitmap ends up being 8 GB)
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// but it hardly matters: e0 00 is not valid UTF-8 either.
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//
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// If this fails we fall back to the 32 bit memory mechanism
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arena_size = MaxMem;
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bitmap_size = arena_size / (sizeof(void*)*8/4);
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spans_size = arena_size / PageSize * sizeof(runtime_mheap.spans[0]);
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spans_size = ROUND(spans_size, PageSize);
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for(i = 0; i <= 0x7f; i++) {
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p = (void*)(uintptr)(i<<40 | 0x00c0ULL<<32);
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p = runtime_SysReserve(p, bitmap_size + spans_size + arena_size);
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if(p != nil)
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break;
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}
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}
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if (p == nil) {
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// On a 32-bit machine, we can't typically get away
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// with a giant virtual address space reservation.
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// Instead we map the memory information bitmap
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// immediately after the data segment, large enough
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// to handle another 2GB of mappings (256 MB),
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// along with a reservation for another 512 MB of memory.
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// When that gets used up, we'll start asking the kernel
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// for any memory anywhere and hope it's in the 2GB
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// following the bitmap (presumably the executable begins
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// near the bottom of memory, so we'll have to use up
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// most of memory before the kernel resorts to giving out
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// memory before the beginning of the text segment).
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//
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// Alternatively we could reserve 512 MB bitmap, enough
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// for 4GB of mappings, and then accept any memory the
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// kernel threw at us, but normally that's a waste of 512 MB
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// of address space, which is probably too much in a 32-bit world.
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bitmap_size = MaxArena32 / (sizeof(void*)*8/4);
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arena_size = 512<<20;
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spans_size = MaxArena32 / PageSize * sizeof(runtime_mheap.spans[0]);
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if(limit > 0 && arena_size+bitmap_size+spans_size > limit) {
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bitmap_size = (limit / 9) & ~((1<<PageShift) - 1);
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arena_size = bitmap_size * 8;
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spans_size = arena_size / PageSize * sizeof(runtime_mheap.spans[0]);
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}
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spans_size = ROUND(spans_size, PageSize);
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// SysReserve treats the address we ask for, end, as a hint,
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// not as an absolute requirement. If we ask for the end
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// of the data segment but the operating system requires
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// a little more space before we can start allocating, it will
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// give out a slightly higher pointer. Except QEMU, which
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// is buggy, as usual: it won't adjust the pointer upward.
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// So adjust it upward a little bit ourselves: 1/4 MB to get
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// away from the running binary image and then round up
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// to a MB boundary.
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want = (byte*)ROUND((uintptr)_end + (1<<18), 1<<20);
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if(0xffffffff - (uintptr)want <= bitmap_size + spans_size + arena_size)
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want = 0;
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p = runtime_SysReserve(want, bitmap_size + spans_size + arena_size);
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if(p == nil)
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runtime_throw("runtime: cannot reserve arena virtual address space");
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if((uintptr)p & (((uintptr)1<<PageShift)-1))
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runtime_printf("runtime: SysReserve returned unaligned address %p; asked for %p", p,
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bitmap_size+spans_size+arena_size);
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}
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if((uintptr)p & (((uintptr)1<<PageShift)-1))
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runtime_throw("runtime: SysReserve returned unaligned address");
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runtime_mheap.spans = (MSpan**)p;
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runtime_mheap.bitmap = p + spans_size;
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runtime_mheap.arena_start = p + spans_size + bitmap_size;
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runtime_mheap.arena_used = runtime_mheap.arena_start;
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runtime_mheap.arena_end = runtime_mheap.arena_start + arena_size;
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// Initialize the rest of the allocator.
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runtime_MHeap_Init(&runtime_mheap);
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runtime_m()->mcache = runtime_allocmcache();
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// See if it works.
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runtime_free(runtime_malloc(1));
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}
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void*
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runtime_MHeap_SysAlloc(MHeap *h, uintptr n)
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{
|
|
byte *p;
|
|
|
|
|
|
if(n > (uintptr)(h->arena_end - h->arena_used)) {
|
|
// We are in 32-bit mode, maybe we didn't use all possible address space yet.
|
|
// Reserve some more space.
|
|
byte *new_end;
|
|
uintptr needed;
|
|
|
|
needed = (uintptr)h->arena_used + n - (uintptr)h->arena_end;
|
|
needed = ROUND(needed, 256<<20);
|
|
new_end = h->arena_end + needed;
|
|
if(new_end <= h->arena_start + MaxArena32) {
|
|
p = runtime_SysReserve(h->arena_end, new_end - h->arena_end);
|
|
if(p == h->arena_end)
|
|
h->arena_end = new_end;
|
|
}
|
|
}
|
|
if(n <= (uintptr)(h->arena_end - h->arena_used)) {
|
|
// Keep taking from our reservation.
|
|
p = h->arena_used;
|
|
runtime_SysMap(p, n, &mstats.heap_sys);
|
|
h->arena_used += n;
|
|
runtime_MHeap_MapBits(h);
|
|
runtime_MHeap_MapSpans(h);
|
|
if(raceenabled)
|
|
runtime_racemapshadow(p, n);
|
|
return p;
|
|
}
|
|
|
|
// If using 64-bit, our reservation is all we have.
|
|
if(sizeof(void*) == 8 && (uintptr)h->bitmap >= 0xffffffffU)
|
|
return nil;
|
|
|
|
// On 32-bit, once the reservation is gone we can
|
|
// try to get memory at a location chosen by the OS
|
|
// and hope that it is in the range we allocated bitmap for.
|
|
p = runtime_SysAlloc(n, &mstats.heap_sys);
|
|
if(p == nil)
|
|
return nil;
|
|
|
|
if(p < h->arena_start || (uintptr)(p+n - h->arena_start) >= MaxArena32) {
|
|
runtime_printf("runtime: memory allocated by OS (%p) not in usable range [%p,%p)\n",
|
|
p, h->arena_start, h->arena_start+MaxArena32);
|
|
runtime_SysFree(p, n, &mstats.heap_sys);
|
|
return nil;
|
|
}
|
|
|
|
if(p+n > h->arena_used) {
|
|
h->arena_used = p+n;
|
|
if(h->arena_used > h->arena_end)
|
|
h->arena_end = h->arena_used;
|
|
runtime_MHeap_MapBits(h);
|
|
runtime_MHeap_MapSpans(h);
|
|
if(raceenabled)
|
|
runtime_racemapshadow(p, n);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
static struct
|
|
{
|
|
Lock;
|
|
byte* pos;
|
|
byte* end;
|
|
} persistent;
|
|
|
|
enum
|
|
{
|
|
PersistentAllocChunk = 256<<10,
|
|
PersistentAllocMaxBlock = 64<<10, // VM reservation granularity is 64K on windows
|
|
};
|
|
|
|
// Wrapper around SysAlloc that can allocate small chunks.
|
|
// There is no associated free operation.
|
|
// Intended for things like function/type/debug-related persistent data.
|
|
// If align is 0, uses default align (currently 8).
|
|
void*
|
|
runtime_persistentalloc(uintptr size, uintptr align, uint64 *stat)
|
|
{
|
|
byte *p;
|
|
|
|
if(align != 0) {
|
|
if(align&(align-1))
|
|
runtime_throw("persistentalloc: align is now a power of 2");
|
|
if(align > PageSize)
|
|
runtime_throw("persistentalloc: align is too large");
|
|
} else
|
|
align = 8;
|
|
if(size >= PersistentAllocMaxBlock)
|
|
return runtime_SysAlloc(size, stat);
|
|
runtime_lock(&persistent);
|
|
persistent.pos = (byte*)ROUND((uintptr)persistent.pos, align);
|
|
if(persistent.pos + size > persistent.end) {
|
|
persistent.pos = runtime_SysAlloc(PersistentAllocChunk, &mstats.other_sys);
|
|
if(persistent.pos == nil) {
|
|
runtime_unlock(&persistent);
|
|
runtime_throw("runtime: cannot allocate memory");
|
|
}
|
|
persistent.end = persistent.pos + PersistentAllocChunk;
|
|
}
|
|
p = persistent.pos;
|
|
persistent.pos += size;
|
|
runtime_unlock(&persistent);
|
|
if(stat != &mstats.other_sys) {
|
|
// reaccount the allocation against provided stat
|
|
runtime_xadd64(stat, size);
|
|
runtime_xadd64(&mstats.other_sys, -(uint64)size);
|
|
}
|
|
return p;
|
|
}
|
|
|
|
static Lock settype_lock;
|
|
|
|
void
|
|
runtime_settype_flush(M *mp)
|
|
{
|
|
uintptr *buf, *endbuf;
|
|
uintptr size, ofs, j, t;
|
|
uintptr ntypes, nbytes2, nbytes3;
|
|
uintptr *data2;
|
|
byte *data3;
|
|
void *v;
|
|
uintptr typ, p;
|
|
MSpan *s;
|
|
|
|
buf = mp->settype_buf;
|
|
endbuf = buf + mp->settype_bufsize;
|
|
|
|
runtime_lock(&settype_lock);
|
|
while(buf < endbuf) {
|
|
v = (void*)*buf;
|
|
*buf = 0;
|
|
buf++;
|
|
typ = *buf;
|
|
buf++;
|
|
|
|
// (Manually inlined copy of runtime_MHeap_Lookup)
|
|
p = (uintptr)v>>PageShift;
|
|
p -= (uintptr)runtime_mheap.arena_start >> PageShift;
|
|
s = runtime_mheap.spans[p];
|
|
|
|
if(s->sizeclass == 0) {
|
|
s->types.compression = MTypes_Single;
|
|
s->types.data = typ;
|
|
continue;
|
|
}
|
|
|
|
size = s->elemsize;
|
|
ofs = ((uintptr)v - (s->start<<PageShift)) / size;
|
|
|
|
switch(s->types.compression) {
|
|
case MTypes_Empty:
|
|
ntypes = (s->npages << PageShift) / size;
|
|
nbytes3 = 8*sizeof(uintptr) + 1*ntypes;
|
|
data3 = runtime_mallocgc(nbytes3, 0, FlagNoProfiling|FlagNoScan|FlagNoInvokeGC);
|
|
s->types.compression = MTypes_Bytes;
|
|
s->types.data = (uintptr)data3;
|
|
((uintptr*)data3)[1] = typ;
|
|
data3[8*sizeof(uintptr) + ofs] = 1;
|
|
break;
|
|
|
|
case MTypes_Words:
|
|
((uintptr*)s->types.data)[ofs] = typ;
|
|
break;
|
|
|
|
case MTypes_Bytes:
|
|
data3 = (byte*)s->types.data;
|
|
for(j=1; j<8; j++) {
|
|
if(((uintptr*)data3)[j] == typ) {
|
|
break;
|
|
}
|
|
if(((uintptr*)data3)[j] == 0) {
|
|
((uintptr*)data3)[j] = typ;
|
|
break;
|
|
}
|
|
}
|
|
if(j < 8) {
|
|
data3[8*sizeof(uintptr) + ofs] = j;
|
|
} else {
|
|
ntypes = (s->npages << PageShift) / size;
|
|
nbytes2 = ntypes * sizeof(uintptr);
|
|
data2 = runtime_mallocgc(nbytes2, 0, FlagNoProfiling|FlagNoScan|FlagNoInvokeGC);
|
|
s->types.compression = MTypes_Words;
|
|
s->types.data = (uintptr)data2;
|
|
|
|
// Move the contents of data3 to data2. Then deallocate data3.
|
|
for(j=0; j<ntypes; j++) {
|
|
t = data3[8*sizeof(uintptr) + j];
|
|
t = ((uintptr*)data3)[t];
|
|
data2[j] = t;
|
|
}
|
|
data2[ofs] = typ;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
runtime_unlock(&settype_lock);
|
|
|
|
mp->settype_bufsize = 0;
|
|
}
|
|
|
|
uintptr
|
|
runtime_gettype(void *v)
|
|
{
|
|
MSpan *s;
|
|
uintptr t, ofs;
|
|
byte *data;
|
|
|
|
s = runtime_MHeap_LookupMaybe(&runtime_mheap, v);
|
|
if(s != nil) {
|
|
t = 0;
|
|
switch(s->types.compression) {
|
|
case MTypes_Empty:
|
|
break;
|
|
case MTypes_Single:
|
|
t = s->types.data;
|
|
break;
|
|
case MTypes_Words:
|
|
ofs = (uintptr)v - (s->start<<PageShift);
|
|
t = ((uintptr*)s->types.data)[ofs/s->elemsize];
|
|
break;
|
|
case MTypes_Bytes:
|
|
ofs = (uintptr)v - (s->start<<PageShift);
|
|
data = (byte*)s->types.data;
|
|
t = data[8*sizeof(uintptr) + ofs/s->elemsize];
|
|
t = ((uintptr*)data)[t];
|
|
break;
|
|
default:
|
|
runtime_throw("runtime_gettype: invalid compression kind");
|
|
}
|
|
if(0) {
|
|
runtime_lock(&settype_lock);
|
|
runtime_printf("%p -> %d,%X\n", v, (int32)s->types.compression, (int64)t);
|
|
runtime_unlock(&settype_lock);
|
|
}
|
|
return t;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// Runtime stubs.
|
|
|
|
void*
|
|
runtime_mal(uintptr n)
|
|
{
|
|
return runtime_mallocgc(n, 0, 0);
|
|
}
|
|
|
|
void *
|
|
runtime_new(const Type *typ)
|
|
{
|
|
return runtime_mallocgc(typ->__size, (uintptr)typ | TypeInfo_SingleObject, typ->kind&KindNoPointers ? FlagNoScan : 0);
|
|
}
|
|
|
|
static void*
|
|
cnew(const Type *typ, intgo n, int32 objtyp)
|
|
{
|
|
if((objtyp&(PtrSize-1)) != objtyp)
|
|
runtime_throw("runtime: invalid objtyp");
|
|
if(n < 0 || (typ->__size > 0 && (uintptr)n > (MaxMem/typ->__size)))
|
|
runtime_panicstring("runtime: allocation size out of range");
|
|
return runtime_mallocgc(typ->__size*n, (uintptr)typ | objtyp, typ->kind&KindNoPointers ? FlagNoScan : 0);
|
|
}
|
|
|
|
// same as runtime_new, but callable from C
|
|
void*
|
|
runtime_cnew(const Type *typ)
|
|
{
|
|
return cnew(typ, 1, TypeInfo_SingleObject);
|
|
}
|
|
|
|
void*
|
|
runtime_cnewarray(const Type *typ, intgo n)
|
|
{
|
|
return cnew(typ, n, TypeInfo_Array);
|
|
}
|
|
|
|
func GC() {
|
|
runtime_gc(1);
|
|
}
|
|
|
|
func SetFinalizer(obj Eface, finalizer Eface) {
|
|
byte *base;
|
|
uintptr size;
|
|
const FuncType *ft;
|
|
const Type *fint;
|
|
const PtrType *ot;
|
|
|
|
if(obj.__type_descriptor == nil) {
|
|
runtime_printf("runtime.SetFinalizer: first argument is nil interface\n");
|
|
goto throw;
|
|
}
|
|
if(obj.__type_descriptor->__code != GO_PTR) {
|
|
runtime_printf("runtime.SetFinalizer: first argument is %S, not pointer\n", *obj.__type_descriptor->__reflection);
|
|
goto throw;
|
|
}
|
|
if(!runtime_mlookup(obj.__object, &base, &size, nil) || obj.__object != base) {
|
|
runtime_printf("runtime.SetFinalizer: pointer not at beginning of allocated block\n");
|
|
goto throw;
|
|
}
|
|
ft = nil;
|
|
ot = (const PtrType*)obj.__type_descriptor;
|
|
fint = nil;
|
|
if(finalizer.__type_descriptor != nil) {
|
|
if(finalizer.__type_descriptor->__code != GO_FUNC)
|
|
goto badfunc;
|
|
ft = (const FuncType*)finalizer.__type_descriptor;
|
|
if(ft->__dotdotdot || ft->__in.__count != 1)
|
|
goto badfunc;
|
|
fint = *(Type**)ft->__in.__values;
|
|
if(__go_type_descriptors_equal(fint, obj.__type_descriptor)) {
|
|
// ok - same type
|
|
} else if(fint->__code == GO_PTR && (fint->__uncommon == nil || fint->__uncommon->__name == nil || obj.type->__uncommon == nil || obj.type->__uncommon->__name == nil) && __go_type_descriptors_equal(((const PtrType*)fint)->__element_type, ((const PtrType*)obj.type)->__element_type)) {
|
|
// ok - not same type, but both pointers,
|
|
// one or the other is unnamed, and same element type, so assignable.
|
|
} else if(fint->kind == GO_INTERFACE && ((const InterfaceType*)fint)->__methods.__count == 0) {
|
|
// ok - satisfies empty interface
|
|
} else if(fint->kind == GO_INTERFACE && __go_convert_interface_2(fint, obj.__type_descriptor, 1) != nil) {
|
|
// ok - satisfies non-empty interface
|
|
} else
|
|
goto badfunc;
|
|
}
|
|
|
|
if(!runtime_addfinalizer(obj.__object, finalizer.__type_descriptor != nil ? *(void**)finalizer.__object : nil, ft, ot)) {
|
|
runtime_printf("runtime.SetFinalizer: finalizer already set\n");
|
|
goto throw;
|
|
}
|
|
return;
|
|
|
|
badfunc:
|
|
runtime_printf("runtime.SetFinalizer: cannot pass %S to finalizer %S\n", *obj.__type_descriptor->__reflection, *finalizer.__type_descriptor->__reflection);
|
|
throw:
|
|
runtime_throw("runtime.SetFinalizer");
|
|
}
|