b0147ac2e6
PR go/79037
compiler, runtime: align gc data for m68k
The current GC requires that the gc data be aligned to at least a 4
byte boundary, because it uses the lower two bits of the address for
flags (see LOOP and PRECISE in runtime/mgc0.c). As the gc data is
stored as a [...]uintptr, that is normally always true. However, on
m68k, that only guarantees 2 byte alignment. Fix it by forcing the
alignment.
The parfor code used by the current GC requires that the parfor data
be aligned to at least an 8 byte boundary. The code in parfor.c
verifies this. This is normally true, as the data uses uint64_t
values, but, again, this must be enforced explicitly on m68k.
Fixes GCC PR 79037.
Reviewed-on: https://go-review.googlesource.com/35478
From-SVN: r244824
118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
/* go-unsafe-pointer.c -- unsafe.Pointer type descriptor for Go.
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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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#include <stddef.h>
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#include "runtime.h"
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#include "go-type.h"
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#include "mgc0.h"
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/* This file provides the type descriptor for the unsafe.Pointer type.
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The unsafe package is defined by the compiler itself, which means
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that there is no package to compile to define the type
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descriptor. */
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extern const struct __go_type_descriptor unsafe_Pointer
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__asm__ (GOSYM_PREFIX "__go_tdn_unsafe.Pointer");
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extern const uintptr unsafe_Pointer_gc[]
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__asm__ (GOSYM_PREFIX "__go_tdn_unsafe.Pointer$gc");
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/* Used to determine the field alignment. */
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struct field_align
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{
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char c;
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void *p;
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};
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/* The reflection string. */
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#define REFLECTION "unsafe.Pointer"
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static const String reflection_string =
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{
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(const byte *) REFLECTION,
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sizeof REFLECTION - 1
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};
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const uintptr unsafe_Pointer_gc[] __attribute__((aligned(4))) =
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{sizeof(void*), GC_APTR, 0, GC_END};
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extern const FuncVal runtime_pointerhash_descriptor
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__asm__ (GOSYM_PREFIX "runtime.pointerhash$descriptor");
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extern const FuncVal runtime_pointerequal_descriptor
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__asm__ (GOSYM_PREFIX "runtime.pointerequal$descriptor");
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const struct __go_type_descriptor unsafe_Pointer =
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{
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/* __code */
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GO_UNSAFE_POINTER | GO_DIRECT_IFACE,
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/* __align */
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__alignof (void *),
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/* __field_align */
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offsetof (struct field_align, p) - 1,
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/* __size */
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sizeof (void *),
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/* __hash */
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78501163U,
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/* __hashfn */
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&runtime_pointerhash_descriptor,
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/* __equalfn */
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&runtime_pointerequal_descriptor,
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/* __gc */
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unsafe_Pointer_gc,
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/* __reflection */
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&reflection_string,
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/* __uncommon */
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NULL,
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/* __pointer_to_this */
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NULL
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};
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/* We also need the type descriptor for the pointer to unsafe.Pointer,
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since any package which refers to that type descriptor will expect
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it to be defined elsewhere. */
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extern const struct __go_ptr_type pointer_unsafe_Pointer
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__asm__ (GOSYM_PREFIX "__go_td_pN14_unsafe.Pointer");
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/* The reflection string. */
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#define PREFLECTION "*unsafe.Pointer"
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static const String preflection_string =
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{
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(const byte *) PREFLECTION,
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sizeof PREFLECTION - 1,
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};
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const struct __go_ptr_type pointer_unsafe_Pointer =
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{
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/* __common */
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{
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/* __code */
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GO_PTR | GO_DIRECT_IFACE,
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/* __align */
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__alignof (void *),
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/* __field_align */
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offsetof (struct field_align, p) - 1,
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/* __size */
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sizeof (void *),
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/* __hash */
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1256018616U,
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/* __hashfn */
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&runtime_pointerhash_descriptor,
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/* __equalfn */
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&runtime_pointerequal_descriptor,
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/* __gc */
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unsafe_Pointer_gc,
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/* __reflection */
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&preflection_string,
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/* __uncommon */
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NULL,
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/* __pointer_to_this */
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NULL
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},
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/* __element_type */
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&unsafe_Pointer
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};
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