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f8d9fa9e80
This upgrades all of libgo other than the runtime package to the Go 1.4 release. In Go 1.4 much of the runtime was rewritten into Go. Merging that code will take more time and will not change the API, so I'm putting it off for now. There are a few runtime changes anyhow, to accomodate other packages that rely on minor modifications to the runtime support. The compiler changes slightly to add a one-bit flag to each type descriptor kind that is stored directly in an interface, which for gccgo is currently only pointer types. Another one-bit flag (gcprog) is reserved because it is used by the gc compiler, but gccgo does not currently use it. There is another error check in the compiler since I ran across it during testing. gotools/: * Makefile.am (go_cmd_go_files): Sort entries. Add generate.go. * Makefile.in: Rebuild. From-SVN: r219627
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_CODE_MASK) == 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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