[dev.cc] runtime: convert memory allocator and garbage collector to Go
The conversion was done with an automated tool and then
modified only as necessary to make it compile and run.
[This CL is part of the removal of C code from package runtime.
See golang.org/s/dev.cc for an overview.]
LGTM=r
R=r
CC=austin, dvyukov, golang-codereviews, iant, khr
https://golang.org/cl/167540043
diff --git a/src/runtime/mfixalloc.go b/src/runtime/mfixalloc.go
new file mode 100644
index 0000000..b66a17e
--- /dev/null
+++ b/src/runtime/mfixalloc.go
@@ -0,0 +1,59 @@
+// 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.
+
+// Fixed-size object allocator. Returned memory is not zeroed.
+//
+// See malloc.h for overview.
+
+package runtime
+
+import "unsafe"
+
+// Initialize f to allocate objects of the given size,
+// using the allocator to obtain chunks of memory.
+func fixAlloc_Init(f *fixalloc, size uintptr, first func(unsafe.Pointer, unsafe.Pointer), arg unsafe.Pointer, stat *uint64) {
+ f.size = size
+ f.first = *(*unsafe.Pointer)(unsafe.Pointer(&first))
+ f.arg = arg
+ f.list = nil
+ f.chunk = nil
+ f.nchunk = 0
+ f.inuse = 0
+ f.stat = stat
+}
+
+func fixAlloc_Alloc(f *fixalloc) unsafe.Pointer {
+ if f.size == 0 {
+ print("runtime: use of FixAlloc_Alloc before FixAlloc_Init\n")
+ gothrow("runtime: internal error")
+ }
+
+ if f.list != nil {
+ v := unsafe.Pointer(f.list)
+ f.list = f.list.next
+ f.inuse += f.size
+ return v
+ }
+ if uintptr(f.nchunk) < f.size {
+ f.chunk = (*uint8)(persistentalloc(_FixAllocChunk, 0, f.stat))
+ f.nchunk = _FixAllocChunk
+ }
+
+ v := (unsafe.Pointer)(f.chunk)
+ if f.first != nil {
+ fn := *(*func(unsafe.Pointer, unsafe.Pointer))(unsafe.Pointer(&f.first))
+ fn(f.arg, v)
+ }
+ f.chunk = (*byte)(add(unsafe.Pointer(f.chunk), f.size))
+ f.nchunk -= uint32(f.size)
+ f.inuse += f.size
+ return v
+}
+
+func fixAlloc_Free(f *fixalloc, p unsafe.Pointer) {
+ f.inuse -= f.size
+ v := (*mlink)(p)
+ v.next = f.list
+ f.list = v
+}
