mirror of
https://github.com/golang/go
synced 2024-11-20 10:54:49 -07:00
22a5c78f44
because they are in package runtime. another step to enforcing package boundaries. R=r DELTA=732 (114 added, 93 deleted, 525 changed) OCL=35811 CL=35824
97 lines
1.9 KiB
C
97 lines
1.9 KiB
C
// Copyright 2009 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Heap map, 32-bit version
|
|
// See malloc.h and mheap.c for overview.
|
|
|
|
#include "runtime.h"
|
|
#include "malloc.h"
|
|
|
|
// 3-level radix tree mapping page ids to Span*.
|
|
void
|
|
MHeapMap_Init(MHeapMap *m, void *(*allocator)(size_t))
|
|
{
|
|
m->allocator = allocator;
|
|
}
|
|
|
|
MSpan*
|
|
MHeapMap_Get(MHeapMap *m, PageID k)
|
|
{
|
|
int32 i1, i2;
|
|
|
|
i2 = k & MHeapMap_Level2Mask;
|
|
k >>= MHeapMap_Level2Bits;
|
|
i1 = k & MHeapMap_Level1Mask;
|
|
k >>= MHeapMap_Level1Bits;
|
|
if(k != 0)
|
|
throw("MHeapMap_Get");
|
|
|
|
return m->p[i1]->s[i2];
|
|
}
|
|
|
|
MSpan*
|
|
MHeapMap_GetMaybe(MHeapMap *m, PageID k)
|
|
{
|
|
int32 i1, i2;
|
|
MHeapMapNode2 *p2;
|
|
|
|
i2 = k & MHeapMap_Level2Mask;
|
|
k >>= MHeapMap_Level2Bits;
|
|
i1 = k & MHeapMap_Level1Mask;
|
|
k >>= MHeapMap_Level1Bits;
|
|
if(k != 0)
|
|
throw("MHeapMap_Get");
|
|
|
|
p2 = m->p[i1];
|
|
if(p2 == nil)
|
|
return nil;
|
|
return p2->s[i2];
|
|
}
|
|
|
|
void
|
|
MHeapMap_Set(MHeapMap *m, PageID k, MSpan *s)
|
|
{
|
|
int32 i1, i2;
|
|
|
|
i2 = k & MHeapMap_Level2Mask;
|
|
k >>= MHeapMap_Level2Bits;
|
|
i1 = k & MHeapMap_Level1Mask;
|
|
k >>= MHeapMap_Level1Bits;
|
|
if(k != 0)
|
|
throw("MHeapMap_Set");
|
|
|
|
m->p[i1]->s[i2] = s;
|
|
}
|
|
|
|
// Allocate the storage required for entries [k, k+1, ..., k+len-1]
|
|
// so that Get and Set calls need not check for nil pointers.
|
|
bool
|
|
MHeapMap_Preallocate(MHeapMap *m, PageID k, uintptr len)
|
|
{
|
|
uintptr end;
|
|
int32 i1;
|
|
MHeapMapNode2 *p2;
|
|
|
|
end = k+len;
|
|
while(k < end) {
|
|
if((k >> MHeapMap_TotalBits) != 0)
|
|
return false;
|
|
i1 = (k >> MHeapMap_Level2Bits) & MHeapMap_Level1Mask;
|
|
|
|
// first-level pointer
|
|
if(m->p[i1] == nil) {
|
|
p2 = m->allocator(sizeof *p2);
|
|
if(p2 == nil)
|
|
return false;
|
|
runtime_memclr((byte*)p2, sizeof *p2);
|
|
m->p[i1] = p2;
|
|
}
|
|
|
|
// advance key past this leaf node
|
|
k = ((k >> MHeapMap_Level2Bits) + 1) << MHeapMap_Level2Bits;
|
|
}
|
|
return true;
|
|
}
|
|
|