100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
/* go-make-slice.c -- make a slice.
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Copyright 2011 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#include <stdint.h>
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#include "runtime.h"
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#include "go-alloc.h"
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#include "go-assert.h"
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#include "go-panic.h"
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#include "go-type.h"
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#include "array.h"
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#include "arch.h"
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#include "malloc.h"
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/* Dummy word to use as base pointer for make([]T, 0).
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Since you cannot take the address of such a slice,
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you can't tell that they all have the same base pointer. */
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uintptr runtime_zerobase;
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struct __go_open_array
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__go_make_slice2 (const struct __go_type_descriptor *td, uintptr_t len,
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uintptr_t cap)
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{
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const struct __go_slice_type* std;
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intgo ilen;
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intgo icap;
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uintptr_t size;
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struct __go_open_array ret;
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__go_assert (td->__code == GO_SLICE);
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std = (const struct __go_slice_type *) td;
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ilen = (intgo) len;
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if (ilen < 0
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|| (uintptr_t) ilen != len
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|| (std->__element_type->__size > 0
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&& len > MaxMem / std->__element_type->__size))
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runtime_panicstring ("makeslice: len out of range");
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icap = (intgo) cap;
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if (cap < len
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|| (uintptr_t) icap != cap
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|| (std->__element_type->__size > 0
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&& cap > MaxMem / std->__element_type->__size))
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runtime_panicstring ("makeslice: cap out of range");
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ret.__count = ilen;
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ret.__capacity = icap;
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size = cap * std->__element_type->__size;
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if (size == 0)
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ret.__values = &runtime_zerobase;
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else if ((std->__element_type->__code & GO_NO_POINTERS) != 0)
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ret.__values =
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runtime_mallocgc (size,
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(uintptr) std->__element_type | TypeInfo_Array,
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FlagNoScan);
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else
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ret.__values =
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runtime_mallocgc (size,
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(uintptr) std->__element_type | TypeInfo_Array,
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0);
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return ret;
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}
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struct __go_open_array
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__go_make_slice1 (const struct __go_type_descriptor *td, uintptr_t len)
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{
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return __go_make_slice2 (td, len, len);
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}
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struct __go_open_array
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__go_make_slice2_big (const struct __go_type_descriptor *td, uint64_t len,
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uint64_t cap)
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{
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uintptr_t slen;
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uintptr_t scap;
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slen = (uintptr_t) len;
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if ((uint64_t) slen != len)
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runtime_panicstring ("makeslice: len out of range");
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scap = (uintptr_t) cap;
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if ((uint64_t) scap != cap)
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runtime_panicstring ("makeslice: cap out of range");
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return __go_make_slice2 (td, slen, scap);
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}
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struct __go_open_array
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__go_make_slice1_big (const struct __go_type_descriptor *td, uint64_t len)
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{
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return __go_make_slice2_big (td, len, len);
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}
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