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gc: implement == on structs and arrays

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To allow these types as map keys, we must fill in
equal and hash functions in their algorithm tables.
Structs or arrays that are "just memory", like [2]int,
can and do continue to use the AMEM algorithm.
Structs or arrays that contain special values like
strings or interface values use generated functions
for both equal and hash.

The runtime helper func runtime.equal(t, x, y) bool handles
the general equality case for x == y and calls out to
the equal implementation in the algorithm table.

For short values (<= 4 struct fields or array elements),
the sequence of elementwise comparisons is inlined
instead of calling runtime.equal.

R=ken, mpimenov
CC=golang-dev
https://golang.org/cl/5451105
This commit is contained in:
Russ Cox 2011-12-12 22:22:09 -05:00
parent 83f648c962
commit 196b663075
24 changed files with 1174 additions and 163 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/cmd/5g/gg.h
View File

@ -43,6 +43,8 @@ struct Prog
uchar scond;
};
#define TEXTFLAG reg
#define REGALLOC_R0 0
#define REGALLOC_RMAX REGEXT
#define REGALLOC_F0 (REGALLOC_RMAX+1)

11
src/cmd/5l/obj.c
View File

@ -585,6 +585,10 @@ loop:
errorexit();
}
cursym = s;
if(s->type != 0 && s->type != SXREF && (p->reg & DUPOK)) {
skip = 1;
goto casedef;
}
if(ntext++ == 0 && s->type != 0 && s->type != SXREF) {
/* redefinition, so file has probably been seen before */
if(debug['v'])
@ -592,13 +596,8 @@ loop:
return;
}
skip = 0;
if(s->type != 0 && s->type != SXREF) {
if(p->reg & DUPOK) {
skip = 1;
goto casedef;
}
if(s->type != 0 && s->type != SXREF)
diag("redefinition: %s\n%P", s->name, p);
}
if(etextp)
etextp->next = s;
else

2
src/cmd/6g/gg.h
View File

@ -41,6 +41,8 @@ struct Prog
void* reg; // pointer to containing Reg struct
};
#define TEXTFLAG from.scale
EXTERN int32 dynloc;
EXTERN uchar reg[D_NONE];
EXTERN int32 pcloc; // instruction counter

4
src/cmd/6l/obj.c
View File

@ -592,6 +592,10 @@ loop:
case ATEXT:
s = p->from.sym;
if(s->text != nil) {
if(p->from.scale & DUPOK) {
skip = 1;
goto casdef;
}
diag("%s: %s: redefinition", pn, s->name);
return;
}

2
src/cmd/8g/gg.h
View File

@ -43,6 +43,8 @@ struct Prog
void* reg; // pointer to containing Reg struct
};
#define TEXTFLAG from.scale
// foptoas flags
enum
{

4
src/cmd/8l/obj.c
View File

@ -600,6 +600,10 @@ loop:
case ATEXT:
s = p->from.sym;
if(s->text != nil) {
if(p->from.scale & DUPOK) {
skip = 1;
goto casdef;
}
diag("%s: %s: redefinition", pn, s->name);
return;
}

1
src/cmd/gc/align.c
View File

@ -497,6 +497,7 @@ typeinit(void)
okforeq[TMAP] = 1; // nil only; refined in typecheck
okforeq[TFUNC] = 1; // nil only; refined in typecheck
okforeq[TARRAY] = 1; // nil slice only; refined in typecheck
okforeq[TSTRUCT] = 1; // it's complicated; refined in typecheck
okforcmp[TSTRING] = 1;

130
src/cmd/gc/builtin.c.boot
View File

@ -1,7 +1,8 @@
char *runtimeimport =
"package runtime\n"
"import runtime \"runtime\"\n"
"func @\"\".new(typ *byte) *any\n"
"import unsafe \"unsafe\"\n"
"func @\"\".new(@\"\".typ *byte) *any\n"
"func @\"\".panicindex()\n"
"func @\"\".panicslice()\n"
"func @\"\".throwreturn()\n"
@ -24,8 +25,8 @@ char *runtimeimport =
"func @\"\".goprintf()\n"
"func @\"\".concatstring()\n"
"func @\"\".append()\n"
"func @\"\".appendslice(typ *byte, x any, y []any) any\n"
"func @\"\".appendstr(typ *byte, x []byte, y string) []byte\n"
"func @\"\".appendslice(@\"\".typ *byte, @\"\".x any, @\"\".y []any) any\n"
"func @\"\".appendstr(@\"\".typ *byte, @\"\".x []byte, @\"\".y string) []byte\n"
"func @\"\".cmpstring(? string, ? string) int\n"
"func @\"\".slicestring(? string, ? int, ? int) string\n"
"func @\"\".slicestring1(? string, ? int) string\n"
@ -35,60 +36,67 @@ char *runtimeimport =
"func @\"\".stringtoslicebyte(? string) []byte\n"
"func @\"\".stringtoslicerune(? string) []rune\n"
"func @\"\".stringiter(? string, ? int) int\n"
"func @\"\".stringiter2(? string, ? int) (retk int, retv rune)\n"
"func @\"\".copy(to any, fr any, wid uint32) int\n"
"func @\"\".slicestringcopy(to any, fr any) int\n"
"func @\"\".convI2E(elem any) any\n"
"func @\"\".convI2I(typ *byte, elem any) any\n"
"func @\"\".convT2E(typ *byte, elem any) any\n"
"func @\"\".convT2I(typ *byte, typ2 *byte, elem any) any\n"
"func @\"\".assertE2E(typ *byte, iface any) any\n"
"func @\"\".assertE2E2(typ *byte, iface any) (ret any, ok bool)\n"
"func @\"\".assertE2I(typ *byte, iface any) any\n"
"func @\"\".assertE2I2(typ *byte, iface any) (ret any, ok bool)\n"
"func @\"\".assertE2T(typ *byte, iface any) any\n"
"func @\"\".assertE2T2(typ *byte, iface any) (ret any, ok bool)\n"
"func @\"\".assertI2E(typ *byte, iface any) any\n"
"func @\"\".assertI2E2(typ *byte, iface any) (ret any, ok bool)\n"
"func @\"\".assertI2I(typ *byte, iface any) any\n"
"func @\"\".assertI2I2(typ *byte, iface any) (ret any, ok bool)\n"
"func @\"\".assertI2T(typ *byte, iface any) any\n"
"func @\"\".assertI2T2(typ *byte, iface any) (ret any, ok bool)\n"
"func @\"\".ifaceeq(i1 any, i2 any) bool\n"
"func @\"\".efaceeq(i1 any, i2 any) bool\n"
"func @\"\".ifacethash(i1 any) uint32\n"
"func @\"\".efacethash(i1 any) uint32\n"
"func @\"\".makemap(mapType *byte, hint int64) map[any]any\n"
"func @\"\".mapaccess1(mapType *byte, hmap map[any]any, key any) any\n"
"func @\"\".mapaccess2(mapType *byte, hmap map[any]any, key any) (val any, pres bool)\n"
"func @\"\".mapassign1(mapType *byte, hmap map[any]any, key any, val any)\n"
"func @\"\".mapassign2(mapType *byte, hmap map[any]any, key any, val any, pres bool)\n"
"func @\"\".mapiterinit(mapType *byte, hmap map[any]any, hiter *any)\n"
"func @\"\".mapdelete(mapType *byte, hmap map[any]any, key any)\n"
"func @\"\".mapiternext(hiter *any)\n"
"func @\"\".mapiter1(hiter *any) any\n"
"func @\"\".mapiter2(hiter *any) (key any, val any)\n"
"func @\"\".makechan(chanType *byte, hint int64) chan any\n"
"func @\"\".chanrecv1(chanType *byte, hchan <-chan any) any\n"
"func @\"\".chanrecv2(chanType *byte, hchan <-chan any) (elem any, received bool)\n"
"func @\"\".chansend1(chanType *byte, hchan chan<- any, elem any)\n"
"func @\"\".closechan(hchan any)\n"
"func @\"\".selectnbsend(chanType *byte, hchan chan<- any, elem any) bool\n"
"func @\"\".selectnbrecv(chanType *byte, elem *any, hchan <-chan any) bool\n"
"func @\"\".selectnbrecv2(chanType *byte, elem *any, received *bool, hchan <-chan any) bool\n"
"func @\"\".newselect(size int) *byte\n"
"func @\"\".selectsend(sel *byte, hchan chan<- any, elem *any) bool\n"
"func @\"\".selectrecv(sel *byte, hchan <-chan any, elem *any) bool\n"
"func @\"\".selectrecv2(sel *byte, hchan <-chan any, elem *any, received *bool) bool\n"
"func @\"\".selectdefault(sel *byte) bool\n"
"func @\"\".selectgo(sel *byte)\n"
"func @\"\".stringiter2(? string, ? int) (@\"\".retk int, @\"\".retv rune)\n"
"func @\"\".copy(@\"\".to any, @\"\".fr any, @\"\".wid uint32) int\n"
"func @\"\".slicestringcopy(@\"\".to any, @\"\".fr any) int\n"
"func @\"\".convI2E(@\"\".elem any) any\n"
"func @\"\".convI2I(@\"\".typ *byte, @\"\".elem any) any\n"
"func @\"\".convT2E(@\"\".typ *byte, @\"\".elem any) any\n"
"func @\"\".convT2I(@\"\".typ *byte, @\"\".typ2 *byte, @\"\".elem any) any\n"
"func @\"\".assertE2E(@\"\".typ *byte, @\"\".iface any) any\n"
"func @\"\".assertE2E2(@\"\".typ *byte, @\"\".iface any) (@\"\".ret any, @\"\".ok bool)\n"
"func @\"\".assertE2I(@\"\".typ *byte, @\"\".iface any) any\n"
"func @\"\".assertE2I2(@\"\".typ *byte, @\"\".iface any) (@\"\".ret any, @\"\".ok bool)\n"
"func @\"\".assertE2T(@\"\".typ *byte, @\"\".iface any) any\n"
"func @\"\".assertE2T2(@\"\".typ *byte, @\"\".iface any) (@\"\".ret any, @\"\".ok bool)\n"
"func @\"\".assertI2E(@\"\".typ *byte, @\"\".iface any) any\n"
"func @\"\".assertI2E2(@\"\".typ *byte, @\"\".iface any) (@\"\".ret any, @\"\".ok bool)\n"
"func @\"\".assertI2I(@\"\".typ *byte, @\"\".iface any) any\n"
"func @\"\".assertI2I2(@\"\".typ *byte, @\"\".iface any) (@\"\".ret any, @\"\".ok bool)\n"
"func @\"\".assertI2T(@\"\".typ *byte, @\"\".iface any) any\n"
"func @\"\".assertI2T2(@\"\".typ *byte, @\"\".iface any) (@\"\".ret any, @\"\".ok bool)\n"
"func @\"\".ifaceeq(@\"\".i1 any, @\"\".i2 any) bool\n"
"func @\"\".efaceeq(@\"\".i1 any, @\"\".i2 any) bool\n"
"func @\"\".ifacethash(@\"\".i1 any) uint32\n"
"func @\"\".efacethash(@\"\".i1 any) uint32\n"
"func @\"\".equal(@\"\".typ *byte, @\"\".x1 any, @\"\".x2 any) bool\n"
"func @\"\".makemap(@\"\".mapType *byte, @\"\".hint int64) map[any]any\n"
"func @\"\".mapaccess1(@\"\".mapType *byte, @\"\".hmap map[any]any, @\"\".key any) any\n"
"func @\"\".mapaccess2(@\"\".mapType *byte, @\"\".hmap map[any]any, @\"\".key any) (@\"\".val any, @\"\".pres bool)\n"
"func @\"\".mapassign1(@\"\".mapType *byte, @\"\".hmap map[any]any, @\"\".key any, @\"\".val any)\n"
"func @\"\".mapassign2(@\"\".mapType *byte, @\"\".hmap map[any]any, @\"\".key any, @\"\".val any, @\"\".pres bool)\n"
"func @\"\".mapiterinit(@\"\".mapType *byte, @\"\".hmap map[any]any, @\"\".hiter *any)\n"
"func @\"\".mapdelete(@\"\".mapType *byte, @\"\".hmap map[any]any, @\"\".key any)\n"
"func @\"\".mapiternext(@\"\".hiter *any)\n"
"func @\"\".mapiter1(@\"\".hiter *any) any\n"
"func @\"\".mapiter2(@\"\".hiter *any) (@\"\".key any, @\"\".val any)\n"
"func @\"\".makechan(@\"\".chanType *byte, @\"\".hint int64) chan any\n"
"func @\"\".chanrecv1(@\"\".chanType *byte, @\"\".hchan <-chan any) any\n"
"func @\"\".chanrecv2(@\"\".chanType *byte, @\"\".hchan <-chan any) (@\"\".elem any, @\"\".received bool)\n"
"func @\"\".chansend1(@\"\".chanType *byte, @\"\".hchan chan<- any, @\"\".elem any)\n"
"func @\"\".closechan(@\"\".hchan any)\n"
"func @\"\".selectnbsend(@\"\".chanType *byte, @\"\".hchan chan<- any, @\"\".elem any) bool\n"
"func @\"\".selectnbrecv(@\"\".chanType *byte, @\"\".elem *any, @\"\".hchan <-chan any) bool\n"
"func @\"\".selectnbrecv2(@\"\".chanType *byte, @\"\".elem *any, @\"\".received *bool, @\"\".hchan <-chan any) bool\n"
"func @\"\".newselect(@\"\".size int) *byte\n"
"func @\"\".selectsend(@\"\".sel *byte, @\"\".hchan chan<- any, @\"\".elem *any) bool\n"
"func @\"\".selectrecv(@\"\".sel *byte, @\"\".hchan <-chan any, @\"\".elem *any) bool\n"
"func @\"\".selectrecv2(@\"\".sel *byte, @\"\".hchan <-chan any, @\"\".elem *any, @\"\".received *bool) bool\n"
"func @\"\".selectdefault(@\"\".sel *byte) bool\n"
"func @\"\".selectgo(@\"\".sel *byte)\n"
"func @\"\".block()\n"
"func @\"\".makeslice(typ *byte, nel int64, cap int64) []any\n"
"func @\"\".growslice(typ *byte, old []any, n int64) []any\n"
"func @\"\".sliceslice1(old []any, lb uint64, width uint64) []any\n"
"func @\"\".sliceslice(old []any, lb uint64, hb uint64, width uint64) []any\n"
"func @\"\".slicearray(old *any, nel uint64, lb uint64, hb uint64, width uint64) []any\n"
"func @\"\".makeslice(@\"\".typ *byte, @\"\".nel int64, @\"\".cap int64) []any\n"
"func @\"\".growslice(@\"\".typ *byte, @\"\".old []any, @\"\".n int64) []any\n"
"func @\"\".sliceslice1(@\"\".old []any, @\"\".lb uint64, @\"\".width uint64) []any\n"
"func @\"\".sliceslice(@\"\".old []any, @\"\".lb uint64, @\"\".hb uint64, @\"\".width uint64) []any\n"
"func @\"\".slicearray(@\"\".old *any, @\"\".nel uint64, @\"\".lb uint64, @\"\".hb uint64, @\"\".width uint64) []any\n"
"func @\"\".closure()\n"
"func @\"\".memequal(@\"\".eq *bool, @\"\".size uintptr, @\"\".x @\"unsafe\".Pointer, @\"\".y @\"unsafe\".Pointer)\n"
"func @\"\".memequal8(@\"\".eq *bool, @\"\".size uintptr, @\"\".x @\"unsafe\".Pointer, @\"\".y @\"unsafe\".Pointer)\n"
"func @\"\".memequal16(@\"\".eq *bool, @\"\".size uintptr, @\"\".x @\"unsafe\".Pointer, @\"\".y @\"unsafe\".Pointer)\n"
"func @\"\".memequal32(@\"\".eq *bool, @\"\".size uintptr, @\"\".x @\"unsafe\".Pointer, @\"\".y @\"unsafe\".Pointer)\n"
"func @\"\".memequal64(@\"\".eq *bool, @\"\".size uintptr, @\"\".x @\"unsafe\".Pointer, @\"\".y @\"unsafe\".Pointer)\n"
"func @\"\".memequal128(@\"\".eq *bool, @\"\".size uintptr, @\"\".x @\"unsafe\".Pointer, @\"\".y @\"unsafe\".Pointer)\n"
"func @\"\".int64div(? int64, ? int64) int64\n"
"func @\"\".uint64div(? uint64, ? uint64) uint64\n"
"func @\"\".int64mod(? int64, ? int64) int64\n"
@ -97,7 +105,7 @@ char *runtimeimport =
"func @\"\".float64touint64(? float64) uint64\n"
"func @\"\".int64tofloat64(? int64) float64\n"
"func @\"\".uint64tofloat64(? uint64) float64\n"
"func @\"\".complex128div(num complex128, den complex128) complex128\n"
"func @\"\".complex128div(@\"\".num complex128, @\"\".den complex128) complex128\n"
"\n"
"$$\n";
char *unsafeimport =
@ -107,10 +115,10 @@ char *unsafeimport =
"func @\"\".Offsetof(? any) uintptr\n"
"func @\"\".Sizeof(? any) uintptr\n"
"func @\"\".Alignof(? any) uintptr\n"
"func @\"\".Typeof(i interface {}) interface {}\n"
"func @\"\".Reflect(i interface {}) (typ interface {}, addr @\"\".Pointer)\n"
"func @\"\".Unreflect(typ interface {}, addr @\"\".Pointer) interface {}\n"
"func @\"\".New(typ interface {}) @\"\".Pointer\n"
"func @\"\".NewArray(typ interface {}, n int) @\"\".Pointer\n"
"func @\"\".Typeof(@\"\".i interface {}) interface {}\n"
"func @\"\".Reflect(@\"\".i interface {}) (@\"\".typ interface {}, @\"\".addr @\"\".Pointer)\n"
"func @\"\".Unreflect(@\"\".typ interface {}, @\"\".addr @\"\".Pointer) interface {}\n"
"func @\"\".New(@\"\".typ interface {}) @\"\".Pointer\n"
"func @\"\".NewArray(@\"\".typ interface {}, @\"\".n int) @\"\".Pointer\n"
"\n"
"$$\n";

19
src/cmd/gc/go.h
View File

@ -37,23 +37,24 @@ enum
AUNK = 100,
// these values are known by runtime
// These values are known by runtime.
// The MEMx and NOEQx values must run in parallel. See algtype.
AMEM = 0,
ANOEQ,
ASTRING,
AINTER,
ANILINTER,
ASLICE,
AMEM8,
AMEM16,
AMEM32,
AMEM64,
AMEM128,
ANOEQ,
ANOEQ8,
ANOEQ16,
ANOEQ32,
ANOEQ64,
ANOEQ128,
ASTRING,
AINTER,
ANILINTER,
ASLICE,
BADWIDTH = -1000000000,
};
@ -245,6 +246,7 @@ struct Node
uchar readonly;
uchar implicit; // don't show in printout
uchar addrtaken; // address taken, even if not moved to heap
uchar dupok; // duplicate definitions ok (for func)
// most nodes
Type* type;
@ -1085,6 +1087,7 @@ void dumptypestructs(void);
Type* methodfunc(Type *f, Type*);
Node* typename(Type *t);
Sym* typesym(Type *t);
Sym* typesymprefix(char *prefix, Type *t);
int haspointers(Type *t);
/*
@ -1109,6 +1112,7 @@ Node* adddot(Node *n);
int adddot1(Sym *s, Type *t, int d, Type **save, int ignorecase);
Type* aindex(Node *b, Type *t);
int algtype(Type *t);
int algtype1(Type *t, Type **bad);
void argtype(Node *on, Type *t);
Node* assignconv(Node *n, Type *t, char *context);
int assignop(Type *src, Type *dst, char **why);
@ -1129,6 +1133,8 @@ void frame(int context);
Type* funcfirst(Iter *s, Type *t);
Type* funcnext(Iter *s);
void genwrapper(Type *rcvr, Type *method, Sym *newnam, int iface);
void genhash(Sym *sym, Type *t);
void geneq(Sym *sym, Type *t);
Type** getinarg(Type *t);
Type* getinargx(Type *t);
Type** getoutarg(Type *t);
@ -1237,6 +1243,7 @@ void walkexprlist(NodeList *l, NodeList **init);
void walkexprlistsafe(NodeList *l, NodeList **init);
void walkstmt(Node **np);
void walkstmtlist(NodeList *l);
Node* conv(Node*, Type*);
/*
* arch-specific ggen.c/gsubr.c/gobj.c/pgen.c

4
src/cmd/gc/pgen.c
View File

@ -7,6 +7,8 @@
#include "gg.h"
#include "opt.h"
#define DUPOK (1<<1) /* same in all architectures */
static void allocauto(Prog* p);
void
@ -70,6 +72,8 @@ compile(Node *fn)
nodconst(&nod1, types[TINT32], 0);
ptxt = gins(ATEXT, isblank(curfn->nname) ? N : curfn->nname, &nod1);
if(fn->dupok)
ptxt->TEXTFLAG = DUPOK;
afunclit(&ptxt->from);
ginit();

68
src/cmd/gc/reflect.c
View File

@ -13,6 +13,7 @@
static NodeList* signatlist;
static Sym* dtypesym(Type*);
static Sym* weaktypesym(Type*);
static Sym* dalgsym(Type*);
static int
sigcmp(Sig *a, Sig *b)
@ -553,17 +554,20 @@ haspointers(Type *t)
static int
dcommontype(Sym *s, int ot, Type *t)
{
int i, sizeofAlg;
Sym *sptr;
int i, alg, sizeofAlg;
Sym *sptr, *algsym;
static Sym *algarray;
char *p;
sizeofAlg = 4*widthptr;
if(algarray == nil)
algarray = pkglookup("algarray", runtimepkg);
alg = algtype(t);
algsym = S;
if(alg < 0)
algsym = dalgsym(t);
dowidth(t);
if(t->sym != nil && !isptr[t->etype])
sptr = dtypesym(ptrto(t));
else
@ -600,7 +604,10 @@ dcommontype(Sym *s, int ot, Type *t)
if(!haspointers(t))
i |= KindNoPointers;
ot = duint8(s, ot, i); // kind
ot = dsymptr(s, ot, algarray, algtype(t)*sizeofAlg);
if(alg >= 0)
ot = dsymptr(s, ot, algarray, alg*sizeofAlg);
else
ot = dsymptr(s, ot, algsym, 0);
p = smprint("%-uT", t);
//print("dcommontype: %s\n", p);
ot = dgostringptr(s, ot, p); // string
@ -629,6 +636,19 @@ typesym(Type *t)
return s;
}
Sym*
typesymprefix(char *prefix, Type *t)
{
char *p;
Sym *s;
p = smprint("%s.%-T", prefix, t);
s = pkglookup(p, typepkg);
//print("algsym: %s -> %+S\n", p, s);
free(p);
return s;
}
Node*
typename(Type *t)
{
@ -930,3 +950,43 @@ dumptypestructs(void)
dimportpath(mkpkg(strlit("main")));
}
}
Sym*
dalgsym(Type *t)
{
int ot;
Sym *s, *hash, *eq;
char buf[100];
// dalgsym is only called for a type that needs an algorithm table,
// which implies that the type is comparable (or else it would use ANOEQ).
s = typesymprefix(".alg", t);
hash = typesymprefix(".hash", t);
genhash(hash, t);
eq = typesymprefix(".eq", t);
geneq(eq, t);
// ../../pkg/runtime/runtime.h:/Alg
ot = 0;
ot = dsymptr(s, ot, hash, 0);
ot = dsymptr(s, ot, eq, 0);
ot = dsymptr(s, ot, pkglookup("memprint", runtimepkg), 0);
switch(t->width) {
default:
ot = dsymptr(s, ot, pkglookup("memcopy", runtimepkg), 0);
break;
case 1:
case 2:
case 4:
case 8:
case 16:
snprint(buf, sizeof buf, "memcopy%d", (int)t->width*8);
ot = dsymptr(s, ot, pkglookup(buf, runtimepkg), 0);
break;
}
ggloblsym(s, ot, 1);
return s;
}

11
src/cmd/gc/runtime.go
View File

@ -8,6 +8,8 @@
package PACKAGE
import "unsafe"
// emitted by compiler, not referred to by go programs
func new(typ *byte) *any
@ -80,6 +82,8 @@ func efaceeq(i1 any, i2 any) (ret bool)
func ifacethash(i1 any) (ret uint32)
func efacethash(i1 any) (ret uint32)
func equal(typ *byte, x1, x2 any) (ret bool)
// *byte is really *runtime.Type
func makemap(mapType *byte, hint int64) (hmap map[any]any)
func mapaccess1(mapType *byte, hmap map[any]any, key any) (val any)
@ -119,6 +123,13 @@ func slicearray(old *any, nel uint64, lb uint64, hb uint64, width uint64) (ary [
func closure() // has args, but compiler fills in
func memequal(eq *bool, size uintptr, x, y unsafe.Pointer)
func memequal8(eq *bool, size uintptr, x, y unsafe.Pointer)
func memequal16(eq *bool, size uintptr, x, y unsafe.Pointer)
func memequal32(eq *bool, size uintptr, x, y unsafe.Pointer)
func memequal64(eq *bool, size uintptr, x, y unsafe.Pointer)
func memequal128(eq *bool, size uintptr, x, y unsafe.Pointer)
// only used on 32-bit
func int64div(int64, int64) int64
func uint64div(uint64, uint64) uint64

528
src/cmd/gc/subr.c
View File

@ -494,45 +494,109 @@ nod(int op, Node *nleft, Node *nright)
return n;
}
int
algtype1(Type *t, Type **bad)
{
int a, ret;
Type *t1;
if(bad)
*bad = T;
switch(t->etype) {
case TINT8:
case TUINT8:
case TINT16:
case TUINT16:
case TINT32:
case TUINT32:
case TINT64:
case TUINT64:
case TINT:
case TUINT:
case TUINTPTR:
case TCOMPLEX64:
case TCOMPLEX128:
case TFLOAT32:
case TFLOAT64:
case TBOOL:
case TPTR32:
case TPTR64:
case TCHAN:
case TUNSAFEPTR:
return AMEM;
case TFUNC:
case TMAP:
if(bad)
*bad = t;
return ANOEQ;
case TSTRING:
return ASTRING;
case TINTER:
if(isnilinter(t))
return ANILINTER;
return AINTER;
case TARRAY:
if(isslice(t)) {
if(bad)
*bad = t;
return ANOEQ;
}
if(t->bound == 0)
return AMEM;
a = algtype1(t->type, bad);
if(a == ANOEQ || a == AMEM) {
if(a == ANOEQ && bad)
*bad = t;
return a;
}
return -1; // needs special compare
case TSTRUCT:
if(t->type != T && t->type->down == T) {
// One-field struct is same as that one field alone.
return algtype1(t->type->type, bad);
}
ret = AMEM;
for(t1=t->type; t1!=T; t1=t1->down) {
a = algtype1(t1->type, bad);
if(a == ANOEQ)
return ANOEQ; // not comparable
if(a != AMEM)
ret = -1; // needs special compare
}
return ret;
}
fatal("algtype1: unexpected type %T", t);
return 0;
}
int
algtype(Type *t)
{
int a;
if(issimple[t->etype] || isptr[t->etype] || t->etype == TCHAN) {
if(t->width == 1)
a = AMEM8;
else if(t->width == 2)
a = AMEM16;
else if(t->width == 4)
a = AMEM32;
else if(t->width == 8)
a = AMEM64;
else if(t->width == 16)
a = AMEM128;
else
a = AMEM; // just bytes (int, ptr, etc)
} else if(t->etype == TSTRING)
a = ASTRING; // string
else if(isnilinter(t))
a = ANILINTER; // nil interface
else if(t->etype == TINTER)
a = AINTER; // interface
else if(isslice(t))
a = ASLICE; // slice
else {
if(t->width == 1)
a = ANOEQ8;
else if(t->width == 2)
a = ANOEQ16;
else if(t->width == 4)
a = ANOEQ32;
else if(t->width == 8)
a = ANOEQ64;
else if(t->width == 16)
a = ANOEQ128;
else
a = ANOEQ; // just bytes, but no hash/eq
a = algtype1(t, nil);
if(a == AMEM || a == ANOEQ) {
if(isslice(t))
return ASLICE;
switch(t->width) {
case 1:
return a + AMEM8 - AMEM;
case 2:
return a + AMEM16 - AMEM;
case 4:
return a + AMEM32 - AMEM;
case 8:
return a + AMEM64 - AMEM;
case 16:
return a + AMEM128 - AMEM;
}
}
return a;
}
@ -544,11 +608,12 @@ maptype(Type *key, Type *val)
if(key != nil) {
switch(key->etype) {
case TARRAY:
case TSTRUCT:
case TMAP:
case TFUNC:
yyerror("invalid map key type %T", key);
default:
if(algtype1(key, nil) == ANOEQ)
yyerror("invalid map key type %T", key);
break;
case TANY:
// will be resolved later.
break;
case TFORW:
// map[key] used during definition of key.
@ -2358,6 +2423,391 @@ genwrapper(Type *rcvr, Type *method, Sym *newnam, int iface)
funccompile(fn, 0);
}
static Node*
hashmem(Type *t, vlong width)
{
Node *tfn, *n;
Sym *sym;
sym = pkglookup("memhash", runtimepkg);
n = newname(sym);
n->class = PFUNC;
tfn = nod(OTFUNC, N, N);
tfn->list = list(tfn->list, nod(ODCLFIELD, N, typenod(ptrto(types[TUINTPTR]))));
tfn->list = list(tfn->list, nod(ODCLFIELD, N, typenod(types[TUINTPTR])));
tfn->list = list(tfn->list, nod(ODCLFIELD, N, typenod(ptrto(t))));
typecheck(&tfn, Etype);
n->type = tfn->type;
return n;
}
static Node*
hashfor(Type *t)
{
int a;
Sym *sym;
Node *tfn, *n;
a = algtype1(t, nil);
switch(a) {
case AMEM:
return hashmem(t, t->width);
case AINTER:
sym = pkglookup("interhash", runtimepkg);
break;
case ANILINTER:
sym = pkglookup("nilinterhash", runtimepkg);
break;
case ASTRING:
sym = pkglookup("strhash", runtimepkg);
break;
default:
sym = typesymprefix(".hash", t);
break;
}
n = newname(sym);
n->class = PFUNC;
tfn = nod(OTFUNC, N, N);
tfn->list = list(tfn->list, nod(ODCLFIELD, N, typenod(ptrto(types[TUINTPTR]))));
tfn->list = list(tfn->list, nod(ODCLFIELD, N, typenod(types[TUINTPTR])));
tfn->list = list(tfn->list, nod(ODCLFIELD, N, typenod(ptrto(t))));
typecheck(&tfn, Etype);
n->type = tfn->type;
return n;
}
/*
* Generate a helper function to compute the hash of a value of type t.
*/
void
genhash(Sym *sym, Type *t)
{
Node *n, *fn, *np, *nh, *ni, *call, *nx, *na, *tfn;
Node *hashel;
Type *first, *t1;
int64 size;
if(debug['r'])
print("genhash %S %T\n", sym, t);
lineno = 1; // less confusing than end of input
dclcontext = PEXTERN;
markdcl();
// func sym(h *uintptr, s uintptr, p *T)
fn = nod(ODCLFUNC, N, N);
fn->nname = newname(sym);
fn->nname->class = PFUNC;
tfn = nod(OTFUNC, N, N);
fn->nname->ntype = tfn;
n = nod(ODCLFIELD, newname(lookup("h")), typenod(ptrto(types[TUINTPTR])));
tfn->list = list(tfn->list, n);
nh = n->left;
n = nod(ODCLFIELD, newname(lookup("s")), typenod(types[TUINTPTR]));
tfn->list = list(tfn->list, n);
n = nod(ODCLFIELD, newname(lookup("p")), typenod(ptrto(t)));
tfn->list = list(tfn->list, n);
np = n->left;
funchdr(fn);
typecheck(&fn->nname->ntype, Etype);
// genhash is only called for types that have equality but
// cannot be handled by the standard algorithms,
// so t must be either an array or a struct.
switch(t->etype) {
default:
fatal("genhash %T", t);
case TARRAY:
if(isslice(t))
fatal("genhash %T", t);
// An array of pure memory would be handled by the
// standard algorithm, so the element type must not be
// pure memory.
hashel = hashfor(t->type);
n = nod(ORANGE, N, nod(OIND, np, N));
ni = newname(lookup("i"));
ni->type = types[TINT];
n->list = list1(ni);
n->colas = 1;
colasdefn(n->list, n);
ni = n->list->n;
// *h = *h<<3 | *h>>61
n->nbody = list(n->nbody,
nod(OAS,
nod(OIND, nh, N),
nod(OOR,
nod(OLSH, nod(OIND, nh, N), nodintconst(3)),
nod(ORSH, nod(OIND, nh, N), nodintconst(widthptr*8-3)))));
// hashel(h, sizeof(p[i]), &p[i])
call = nod(OCALL, hashel, N);
call->list = list(call->list, nh);
call->list = list(call->list, nodintconst(t->type->width));
nx = nod(OINDEX, np, ni);
nx->etype = 1; // no bounds check
na = nod(OADDR, nx, N);
na->etype = 1; // no escape to heap
call->list = list(call->list, na);
n->nbody = list(n->nbody, call);
fn->nbody = list(fn->nbody, n);
break;
case TSTRUCT:
// Walk the struct using memhash for runs of AMEM
// and calling specific hash functions for the others.
first = T;
for(t1=t->type;; t1=t1->down) {
if(t1 != T && algtype1(t1->type, nil) == AMEM) {
if(first == T)
first = t1;
continue;
}
// Run memhash for fields up to this one.
if(first != T) {
if(first->down == t1)
size = first->type->width;
else if(t1 == T)
size = t->width - first->width; // first->width is offset
else
size = t1->width - first->width; // both are offsets
hashel = hashmem(first->type, size);
// hashel(h, size, &p.first)
call = nod(OCALL, hashel, N);
call->list = list(call->list, nh);
call->list = list(call->list, nodintconst(size));
nx = nod(OXDOT, np, newname(first->sym)); // TODO: fields from other packages?
na = nod(OADDR, nx, N);
na->etype = 1; // no escape to heap
call->list = list(call->list, na);
fn->nbody = list(fn->nbody, call);
first = T;
}
if(t1 == T)
break;
// Run hash for this field.
hashel = hashfor(t1->type);
// hashel(h, size, &p.t1)
call = nod(OCALL, hashel, N);
call->list = list(call->list, nh);
call->list = list(call->list, nodintconst(t1->type->width));
nx = nod(OXDOT, np, newname(t1->sym)); // TODO: fields from other packages?
na = nod(OADDR, nx, N);
na->etype = 1; // no escape to heap
call->list = list(call->list, na);
fn->nbody = list(fn->nbody, call);
}
break;
}
if(debug['r'])
dumplist("genhash body", fn->nbody);
funcbody(fn);
curfn = fn;
fn->dupok = 1;
typecheck(&fn, Etop);
typechecklist(fn->nbody, Etop);
curfn = nil;
funccompile(fn, 0);
}
// Return node for
// if p.field != q.field { *eq = false; return }
static Node*
eqfield(Node *p, Node *q, Node *field, Node *eq)
{
Node *nif, *nx, *ny;
nx = nod(OXDOT, p, field);
ny = nod(OXDOT, q, field);
nif = nod(OIF, N, N);
nif->ntest = nod(ONE, nx, ny);
nif->nbody = list(nif->nbody, nod(OAS, nod(OIND, eq, N), nodbool(0)));
nif->nbody = list(nif->nbody, nod(ORETURN, N, N));
return nif;
}
static Node*
eqmemfunc(vlong size)
{
char buf[30];
switch(size) {
case 1:
case 2:
case 4:
case 8:
case 16:
snprint(buf, sizeof buf, "memequal%d", (int)size*8);
return syslook(buf, 0);
}
return syslook("memequal", 0);
}
// Return node for
// if memequal(size, &p.field, &q.field, eq); !*eq { return }
static Node*
eqmem(Node *p, Node *q, Node *field, vlong size, Node *eq)
{
Node *nif, *nx, *ny, *call;
nx = nod(OADDR, nod(OXDOT, p, field), N);
nx->etype = 1; // does not escape
ny = nod(OADDR, nod(OXDOT, q, field), N);
ny->etype = 1; // does not escape
call = nod(OCALL, eqmemfunc(size), N);
call->list = list(call->list, eq);
call->list = list(call->list, nodintconst(size));
call->list = list(call->list, conv(nx, types[TUNSAFEPTR]));
call->list = list(call->list, conv(ny, types[TUNSAFEPTR]));
nif = nod(OIF, N, N);
nif->ninit = list(nif->ninit, call);
nif->ntest = nod(ONOT, nod(OIND, eq, N), N);
nif->nbody = list(nif->nbody, nod(ORETURN, N, N));
return nif;
}
/*
* Generate a helper function to check equality of two values of type t.
*/
void
geneq(Sym *sym, Type *t)
{
Node *n, *fn, *np, *neq, *nq, *tfn, *nif, *ni, *nx, *ny, *nrange;
Type *t1, *first;
int64 size;
if(debug['r'])
print("geneq %S %T\n", sym, t);
lineno = 1; // less confusing than end of input
dclcontext = PEXTERN;
markdcl();
// func sym(eq *bool, s uintptr, p, q *T)
fn = nod(ODCLFUNC, N, N);
fn->nname = newname(sym);
fn->nname->class = PFUNC;
tfn = nod(OTFUNC, N, N);
fn->nname->ntype = tfn;
n = nod(ODCLFIELD, newname(lookup("eq")), typenod(ptrto(types[TBOOL])));
tfn->list = list(tfn->list, n);
neq = n->left;
n = nod(ODCLFIELD, newname(lookup("s")), typenod(types[TUINTPTR]));
tfn->list = list(tfn->list, n);
n = nod(ODCLFIELD, newname(lookup("p")), typenod(ptrto(t)));
tfn->list = list(tfn->list, n);
np = n->left;
n = nod(ODCLFIELD, newname(lookup("q")), typenod(ptrto(t)));
tfn->list = list(tfn->list, n);
nq = n->left;
funchdr(fn);
// geneq is only called for types that have equality but
// cannot be handled by the standard algorithms,
// so t must be either an array or a struct.
switch(t->etype) {
default:
fatal("geneq %T", t);
case TARRAY:
if(isslice(t))
fatal("geneq %T", t);
// An array of pure memory would be handled by the
// standard memequal, so the element type must not be
// pure memory. Even if we unrolled the range loop,
// each iteration would be a function call, so don't bother
// unrolling.
nrange = nod(ORANGE, N, nod(OIND, np, N));
ni = newname(lookup("i"));
ni->type = types[TINT];
nrange->list = list1(ni);
nrange->colas = 1;
colasdefn(nrange->list, nrange);
ni = nrange->list->n;
// if p[i] != q[i] { *eq = false; return }
nx = nod(OINDEX, np, ni);
nx->etype = 1; // no bounds check
ny = nod(OINDEX, nq, ni);
ny->etype = 1; // no bounds check
nif = nod(OIF, N, N);
nif->ntest = nod(ONE, nx, ny);
nif->nbody = list(nif->nbody, nod(OAS, nod(OIND, neq, N), nodbool(0)));
nif->nbody = list(nif->nbody, nod(ORETURN, N, N));
nrange->nbody = list(nrange->nbody, nif);
fn->nbody = list(fn->nbody, nrange);
// *eq = true;
fn->nbody = list(fn->nbody, nod(OAS, nod(OIND, neq, N), nodbool(1)));
break;
case TSTRUCT:
// Walk the struct using memequal for runs of AMEM
// and calling specific equality tests for the others.
first = T;
for(t1=t->type;; t1=t1->down) {
if(t1 != T && algtype1(t1->type, nil) == AMEM) {
if(first == T)
first = t1;
continue;
}
// Run memequal for fields up to this one.
// TODO(rsc): All the calls to newname are wrong for
// cross-package unexported fields.
if(first != T) {
if(first->down == t1) {
fn->nbody = list(fn->nbody, eqfield(np, nq, newname(first->sym), neq));
} else if(first->down->down == t1) {
fn->nbody = list(fn->nbody, eqfield(np, nq, newname(first->sym), neq));
first = first->down;
fn->nbody = list(fn->nbody, eqfield(np, nq, newname(first->sym), neq));
} else {
// More than two fields: use memequal.
if(t1 == T)
size = t->width - first->width; // first->width is offset
else
size = t1->width - first->width; // both are offsets
fn->nbody = list(fn->nbody, eqmem(np, nq, newname(first->sym), size, neq));
}
first = T;
}
if(t1 == T)
break;
// Check this field, which is not just memory.
fn->nbody = list(fn->nbody, eqfield(np, nq, newname(t1->sym), neq));
}
// *eq = true;
fn->nbody = list(fn->nbody, nod(OAS, nod(OIND, neq, N), nodbool(1)));
break;
}
if(debug['r'])
dumplist("geneq body", fn->nbody);
funcbody(fn);
curfn = fn;
fn->dupok = 1;
typecheck(&fn, Etop);
typechecklist(fn->nbody, Etop);
curfn = nil;
funccompile(fn, 0);
}
static Type*
ifacelookdot(Sym *s, Type *t, int *followptr, int ignorecase)
{

37
src/cmd/gc/typecheck.c
View File

@ -90,11 +90,15 @@ static char* _typekind[] = {
};
static char*
typekind(int et)
typekind(Type *t)
{
int et;
static char buf[50];
char *s;
if(isslice(t))
return "slice";
et = t->etype;
if(0 <= et && et < nelem(_typekind) && (s=_typekind[et]) != nil)
return s;
snprint(buf, sizeof buf, "etype=%d", et);
@ -113,7 +117,7 @@ typecheck(Node **np, int top)
Node *n, *l, *r;
NodeList *args;
int lno, ok, ntop;
Type *t, *tp, *ft, *missing, *have;
Type *t, *tp, *ft, *missing, *have, *badtype;
Val v;
char *why;
@ -419,15 +423,25 @@ reswitch:
if(iscmp[n->op] && t->etype != TIDEAL && !eqtype(l->type, r->type)) {
// comparison is okay as long as one side is
// assignable to the other. convert so they have
// the same type. (the only conversion that isn't
// a no-op is concrete == interface.)
// the same type.
//
// the only conversion that isn't a no-op is concrete == interface.
// in that case, check comparability of the concrete type.
if(r->type->etype != TBLANK && (aop = assignop(l->type, r->type, nil)) != 0) {
if(isinter(r->type) && !isinter(l->type) && algtype1(l->type, nil) == ANOEQ) {
yyerror("invalid operation: %N (operator %O not defined on %s)", n, op, typekind(l->type));
goto error;
}
l = nod(aop, l, N);
l->type = r->type;
l->typecheck = 1;
n->left = l;
t = l->type;
} else if(l->type->etype != TBLANK && (aop = assignop(r->type, l->type, nil)) != 0) {
if(isinter(l->type) && !isinter(r->type) && algtype1(r->type, nil) == ANOEQ) {
yyerror("invalid operation: %N (operator %O not defined on %s)", n, op, typekind(r->type));
goto error;
}
r = nod(aop, r, N);
r->type = l->type;
r->typecheck = 1;
@ -442,16 +456,15 @@ reswitch:
goto error;
}
if(!okfor[op][et]) {
notokfor:
yyerror("invalid operation: %N (operator %O not defined on %s)", n, op, typekind(et));
yyerror("invalid operation: %N (operator %O not defined on %s)", n, op, typekind(t));
goto error;
}
// okfor allows any array == array, map == map, func == func.
// restrict to slice/map/func == nil and nil == slice/map/func.
if(l->type->etype == TARRAY && !isslice(l->type))
goto notokfor;
if(r->type->etype == TARRAY && !isslice(r->type))
goto notokfor;
if(isfixedarray(l->type) && algtype1(l->type, nil) == ANOEQ) {
yyerror("invalid operation: %N (%T cannot be compared)", n, l->type);
goto error;
}
if(isslice(l->type) && !isnil(l) && !isnil(r)) {
yyerror("invalid operation: %N (slice can only be compared to nil)", n);
goto error;
@ -464,6 +477,10 @@ reswitch:
yyerror("invalid operation: %N (func can only be compared to nil)", n);
goto error;
}
if(l->type->etype == TSTRUCT && algtype1(l->type, &badtype) == ANOEQ) {
yyerror("invalid operation: %N (struct containing %T cannot be compared)", n, badtype);
goto error;
}
t = l->type;
if(iscmp[n->op]) {

192
src/cmd/gc/walk.c
View File

@ -7,7 +7,6 @@
#include "go.h"
static Node* walkprint(Node*, NodeList**, int);
static Node* conv(Node*, Type*);
static Node* mapfn(char*, Type*);
static Node* mapfndel(char*, Type*);
static Node* ascompatee1(int, Node*, Node*, NodeList**);
@ -22,6 +21,7 @@ static NodeList* reorder3(NodeList*);
static Node* addstr(Node*, NodeList**);
static Node* appendslice(Node*, NodeList**);
static Node* append(Node*, NodeList**);
static void walkcompare(Node**, NodeList**);
// can this code branch reach the end
// without an unconditional RETURN
@ -456,8 +456,6 @@ walkexpr(Node **np, NodeList **init)
case OXOR:
case OSUB:
case OMUL:
case OEQ:
case ONE:
case OLT:
case OLE:
case OGE:
@ -468,6 +466,13 @@ walkexpr(Node **np, NodeList **init)
walkexpr(&n->right, init);
goto ret;
case OEQ:
case ONE:
walkexpr(&n->left, init);
walkexpr(&n->right, init);
walkcompare(&n, init);
goto ret;
case OANDAND:
case OOROR:
walkexpr(&n->left, init);
@ -2212,7 +2217,7 @@ mkcall1(Node *fn, Type *t, NodeList **init, ...)
return r;
}
static Node*
Node*
conv(Node *n, Type *t)
{
if(eqtype(n->type, t))
@ -2386,3 +2391,182 @@ append(Node *n, NodeList **init)
*init = concat(*init, l);
return ns;
}
static Node*
eqfor(Type *t)
{
int a;
Node *n;
Node *ntype;
Sym *sym;
// Should only arrive here with large memory or
// a struct/array containing a non-memory field/element.
// Small memory is handled inline, and single non-memory
// is handled during type check (OCMPSTR etc).
a = algtype1(t, nil);
if(a != AMEM && a != -1)
fatal("eqfor %T", t);
if(a == AMEM)
return syslook("memequal", 0);
sym = typesymprefix(".eq", t);
n = newname(sym);
n->class = PFUNC;
ntype = nod(OTFUNC, N, N);
ntype->list = list(ntype->list, nod(ODCLFIELD, N, typenod(ptrto(types[TBOOL]))));
ntype->list = list(ntype->list, nod(ODCLFIELD, N, typenod(types[TUINTPTR])));
ntype->list = list(ntype->list, nod(ODCLFIELD, N, typenod(types[TUNSAFEPTR])));
ntype->list = list(ntype->list, nod(ODCLFIELD, N, typenod(types[TUNSAFEPTR])));
typecheck(&ntype, Etype);
n->type = ntype->type;
return n;
}
static int
countfield(Type *t)
{
Type *t1;
int n;
n = 0;
for(t1=t->type; t1!=T; t1=t1->down)
n++;
return n;
}
static void
walkcompare(Node **np, NodeList **init)
{
Node *n, *l, *r, *fn, *call, *a, *li, *ri, *expr;
int andor, i;
Type *t, *t1;
static Node *tempbool;
n = *np;
// Must be comparison of array or struct.
// Otherwise back end handles it.
t = n->left->type;
switch(t->etype) {
default:
return;
case TARRAY:
if(isslice(t))
return;
break;
case TSTRUCT:
break;
}
if(!islvalue(n->left) || !islvalue(n->right))
goto hard;
l = temp(ptrto(t));
a = nod(OAS, l, nod(OADDR, n->left, N));
a->right->etype = 1; // addr does not escape
typecheck(&a, Etop);
*init = list(*init, a);
r = temp(ptrto(t));
a = nod(OAS, r, nod(OADDR, n->right, N));
a->right->etype = 1; // addr does not escape
typecheck(&a, Etop);
*init = list(*init, a);
expr = N;
andor = OANDAND;
if(n->op == ONE)
andor = OOROR;
if(t->etype == TARRAY &&
t->bound <= 4 &&
issimple[t->type->etype]) {
// Four or fewer elements of a basic type.
// Unroll comparisons.
for(i=0; i<t->bound; i++) {
li = nod(OINDEX, l, nodintconst(i));
ri = nod(OINDEX, r, nodintconst(i));
a = nod(n->op, li, ri);
if(expr == N)
expr = a;
else
expr = nod(andor, expr, a);
}
if(expr == N)
expr = nodbool(n->op == OEQ);
typecheck(&expr, Erv);
walkexpr(&expr, init);
*np = expr;
return;
}
if(t->etype == TSTRUCT && countfield(t) <= 4) {
// Struct of four or fewer fields.
// Inline comparisons.
for(t1=t->type; t1; t1=t1->down) {
li = nod(OXDOT, l, newname(t1->sym));
ri = nod(OXDOT, r, newname(t1->sym));
a = nod(n->op, li, ri);
if(expr == N)
expr = a;
else
expr = nod(andor, expr, a);
}
if(expr == N)
expr = nodbool(n->op == OEQ);
typecheck(&expr, Erv);
walkexpr(&expr, init);
*np = expr;
return;
}
// Chose not to inline, but still have addresses.
// Call equality function directly.
// The equality function requires a bool pointer for
// storing its address, because it has to be callable
// from C, and C can't access an ordinary Go return value.
// To avoid creating many temporaries, cache one per function.
if(tempbool == N || tempbool->curfn != curfn)
tempbool = temp(types[TBOOL]);
call = nod(OCALL, eqfor(t), N);
a = nod(OADDR, tempbool, N);
a->etype = 1; // does not escape
call->list = list(call->list, a);
call->list = list(call->list, nodintconst(t->width));
call->list = list(call->list, conv(l, types[TUNSAFEPTR]));
call->list = list(call->list, conv(r, types[TUNSAFEPTR]));
typecheck(&call, Etop);
walkstmt(&call);
*init = list(*init, call);
if(n->op == OEQ)
r = tempbool;
else
r = nod(ONOT, tempbool, N);
typecheck(&r, Erv);
walkexpr(&r, init);
*np = r;
return;
hard:
// Cannot take address of one or both of the operands.
// Instead, pass directly to runtime helper function.
// Easier on the stack than passing the address
// of temporary variables, because we are better at reusing
// the argument space than temporary variable space.
fn = syslook("equal", 1);
l = n->left;
r = n->right;
argtype(fn, n->left->type);
argtype(fn, n->left->type);
r = mkcall1(fn, n->type, init, typename(n->left->type), l, r);
if(n->op == ONE) {
r = nod(ONOT, r, N);
typecheck(&r, Erv);
}
*np = r;
return;
}

2
src/cmd/ld/dwarf.c
View File

@ -1439,7 +1439,7 @@ defdwsymb(Sym* sym, char *s, int t, vlong v, vlong size, int ver, Sym *gotype)
if (strncmp(s, "go.string.", 10) == 0)
return;
if (strncmp(s, "type.", 5) == 0 && strcmp(s, "type.*") != 0) {
if (strncmp(s, "type.", 5) == 0 && strcmp(s, "type.*") != 0 && strncmp(s, "type..", 6) != 0) {
defgotype(sym);
return;
}

18
src/pkg/runtime/alg.c
View File

@ -3,6 +3,7 @@
// license that can be found in the LICENSE file.
#include "runtime.h"
#include "type.h"
/*
* map and chan helpers for
@ -68,7 +69,7 @@ runtime·memprint(uintptr s, void *a)
v = *(uint16*)a;
break;
case 4:
v = *(uintptr*)a;
v = *(uint32*)a;
break;
case 8:
v = *(uint64*)a;
@ -343,3 +344,18 @@ runtime·algarray[] =
[ANOEQ128] { runtime·nohash, runtime·noequal, runtime·memprint, runtime·memcopy128 },
};
// Runtime helpers.
// func equal(t *Type, x T, y T) (ret bool)
#pragma textflag 7
void
runtime·equal(Type *t, ...)
{
byte *x, *y;
bool *ret;
x = (byte*)(&t+1);
y = x + t->size;
ret = (bool*)(y + t->size);
t->alg->equal(ret, t->size, x, y);
}

2
src/pkg/runtime/hashmap.h
View File

@ -66,7 +66,7 @@
#define malloc runtime·mal
#define memset(a,b,c) runtime·memclr((byte*)(a), (uint32)(c))
#define memcpy(a,b,c) runtime·memmove((byte*)(a),(byte*)(b),(uint32)(c))
#define assert(a) if(!(a)) runtime·throw("assert")
#define assert(a) if(!(a)) runtime·throw("hashmap assert")
#define free(x) runtime·free(x)
#define memmove(a,b,c) runtime·memmove(a, b, c)

10
src/pkg/runtime/runtime.h
View File

@ -358,21 +358,21 @@ enum {
enum
{
AMEM,
ANOEQ,
ASTRING,
AINTER,
ANILINTER,
ASLICE,
AMEM8,
AMEM16,
AMEM32,
AMEM64,
AMEM128,
ANOEQ,
ANOEQ8,
ANOEQ16,
ANOEQ32,
ANOEQ64,
ANOEQ128,
ASTRING,
AINTER,
ANILINTER,
ASLICE,
Amax
};
typedef struct Alg Alg;

257
test/cmp.go
View File

@ -58,17 +58,25 @@ func main() {
istrue(ic == id)
istrue(ie == ie)
// these are okay because one side of the
// comparison need only be assignable to the other.
isfalse(a == ib)
isfalse(a == ic)
isfalse(a == id)
isfalse(b == ic)
isfalse(b == id)
istrue(ia != ib)
istrue(ia != ic)
istrue(ia != id)
istrue(ib != ic)
istrue(ib != id)
isfalse(ic != id)
isfalse(ie != ie)
// these are not okay, because there is no comparison on slices or maps.
//isfalse(a == ib)
//isfalse(a == ic)
//isfalse(a == id)
//isfalse(b == ic)
//isfalse(b == id)
istrue(c == id)
istrue(e == ie)
isfalse(ia == b)
//isfalse(ia == b)
isfalse(ia == c)
isfalse(ia == d)
isfalse(ib == c)
@ -76,22 +84,38 @@ func main() {
istrue(ic == d)
istrue(ie == e)
//istrue(a != ib)
//istrue(a != ic)
//istrue(a != id)
//istrue(b != ic)
//istrue(b != id)
isfalse(c != id)
isfalse(e != ie)
//istrue(ia != b)
istrue(ia != c)
istrue(ia != d)
istrue(ib != c)
istrue(ib != d)
isfalse(ic != d)
isfalse(ie != e)
// 6g used to let this go through as true.
var g uint64 = 123
var h int64 = 123
var ig interface{} = g
var ih interface{} = h
isfalse(ig == ih)
istrue(ig != ih)
// map of interface should use == on interface values,
// not memory.
// TODO: should m[c], m[d] be valid here?
var m = make(map[interface{}]int)
m[ic] = 1
m[id] = 2
if m[ic] != 2 {
println("m[ic] = ", m[ic])
panic("bad m[ic]")
if m[c] != 2 {
println("m[c] = ", m[c])
panic("bad m[c]")
}
// non-interface comparisons
@ -104,6 +128,11 @@ func main() {
istrue(c1 == c)
istrue(c2 == c)
isfalse(c != c1)
isfalse(c != c2)
isfalse(c1 != c)
isfalse(c2 != c)
d := make(chan int)
isfalse(c == d)
isfalse(d == c)
@ -111,6 +140,13 @@ func main() {
isfalse(d == c2)
isfalse(c1 == d)
isfalse(c2 == d)
istrue(c != d)
istrue(d != c)
istrue(d != c1)
istrue(d != c2)
istrue(c1 != d)
istrue(c2 != d)
}
// named types vs not
@ -126,6 +162,199 @@ func main() {
isfalse(y == x)
istrue(z == x)
isfalse(z == y)
istrue(x != y)
isfalse(x != z)
istrue(y != z)
istrue(y != x)
isfalse(z != x)
istrue(z != y)
}
// structs
{
var x = struct {
x int
y string
}{1, "hi"}
var y = struct {
x int
y string
}{2, "bye"}
var z = struct {
x int
y string
}{1, "hi"}
isfalse(x == y)
isfalse(y == x)
isfalse(y == z)
isfalse(z == y)
istrue(x == z)
istrue(z == x)
istrue(x != y)
istrue(y != x)
istrue(y != z)
istrue(z != y)
isfalse(x != z)
isfalse(z != x)
var m = make(map[struct {
x int
y string
}]int)
m[x] = 10
m[y] = 20
m[z] = 30
istrue(m[x] == 30)
istrue(m[y] == 20)
istrue(m[z] == 30)
istrue(m[x] != 10)
isfalse(m[x] != 30)
isfalse(m[y] != 20)
isfalse(m[z] != 30)
isfalse(m[x] == 10)
var m1 = make(map[struct {
x int
y string
}]struct {
x int
y string
})
m1[x] = x
m1[y] = y
m1[z] = z
istrue(m1[x] == z)
istrue(m1[y] == y)
istrue(m1[z] == z)
istrue(m1[x] == x)
isfalse(m1[x] != z)
isfalse(m1[y] != y)
isfalse(m1[z] != z)
isfalse(m1[x] != x)
var ix, iy, iz interface{} = x, y, z
isfalse(ix == iy)
isfalse(iy == ix)
isfalse(iy == iz)
isfalse(iz == iy)
istrue(ix == iz)
istrue(iz == ix)
isfalse(x == iy)
isfalse(y == ix)
isfalse(y == iz)
isfalse(z == iy)
istrue(x == iz)
istrue(z == ix)
isfalse(ix == y)
isfalse(iy == x)
isfalse(iy == z)
isfalse(iz == y)
istrue(ix == z)
istrue(iz == x)
istrue(ix != iy)
istrue(iy != ix)
istrue(iy != iz)
istrue(iz != iy)
isfalse(ix != iz)
isfalse(iz != ix)
istrue(x != iy)
istrue(y != ix)
istrue(y != iz)
istrue(z != iy)
isfalse(x != iz)
isfalse(z != ix)
istrue(ix != y)
istrue(iy != x)
istrue(iy != z)
istrue(iz != y)
isfalse(ix != z)
isfalse(iz != x)
}
// arrays
{
var x = [2]string{"1", "hi"}
var y = [2]string{"2", "bye"}
var z = [2]string{"1", "hi"}
isfalse(x == y)
isfalse(y == x)
isfalse(y == z)
isfalse(z == y)
istrue(x == z)
istrue(z == x)
istrue(x != y)
istrue(y != x)
istrue(y != z)
istrue(z != y)
isfalse(x != z)
isfalse(z != x)
var m = make(map[[2]string]int)
m[x] = 10
m[y] = 20
m[z] = 30
istrue(m[x] == 30)
istrue(m[y] == 20)
istrue(m[z] == 30)
isfalse(m[x] != 30)
isfalse(m[y] != 20)
isfalse(m[z] != 30)
var ix, iy, iz interface{} = x, y, z
isfalse(ix == iy)
isfalse(iy == ix)
isfalse(iy == iz)
isfalse(iz == iy)
istrue(ix == iz)
istrue(iz == ix)
isfalse(x == iy)
isfalse(y == ix)
isfalse(y == iz)
isfalse(z == iy)
istrue(x == iz)
istrue(z == ix)
isfalse(ix == y)
isfalse(iy == x)
isfalse(iy == z)
isfalse(iz == y)
istrue(ix == z)
istrue(iz == x)
istrue(ix != iy)
istrue(iy != ix)
istrue(iy != iz)
istrue(iz != iy)
isfalse(ix != iz)
isfalse(iz != ix)
istrue(x != iy)
istrue(y != ix)
istrue(y != iz)
istrue(z != iy)
isfalse(x != iz)
isfalse(z != ix)
istrue(ix != y)
istrue(iy != x)
istrue(iy != z)
istrue(iz != y)
isfalse(ix != z)
isfalse(iz != x)
}
shouldPanic(p1)
@ -149,14 +378,14 @@ func p2() {
func p3() {
var a []int
var ia interface{} = a
var m = make(map[interface{}] int)
var m = make(map[interface{}]int)
m[ia] = 1
}
func p4() {
var b []int
var ib interface{} = b
var m = make(map[interface{}] int)
var m = make(map[interface{}]int)
m[ib] = 1
}

12
test/cmp6.go
View File

@ -11,7 +11,7 @@ func use(bool) {}
type T1 *int
type T2 *int
type T3 struct{}
type T3 struct{ z []int }
var t3 T3
@ -54,4 +54,14 @@ func main() {
use(x == x) // ERROR "slice can only be compared to nil"
use(f == f) // ERROR "func can only be compared to nil"
use(m == m) // ERROR "map can only be compared to nil"
// Comparison with interface that cannot return true
// (would panic).
var i interface{}
use(i == x) // ERROR "invalid operation"
use(x == i) // ERROR "invalid operation"
use(i == f) // ERROR "invalid operation"
use(f == i) // ERROR "invalid operation"
use(i == m) // ERROR "invalid operation"
use(m == i) // ERROR "invalid operation"
}

2
test/interface/noeq.go
View File

@ -13,7 +13,7 @@ func main() {
var (
m map[int]int
s struct{}
s struct{ x []int }
f func()
)
noCmp(m)

4
test/map1.go
View File

@ -31,11 +31,11 @@ var (
_ map[string]v
_ map[chan int]v
_ map[*int]v
_ map[struct{}]v
_ map[[10]int]v
// invalid
_ map[struct{}]v // ERROR "invalid map key"
_ map[[]int]v // ERROR "invalid map key"
_ map[[10]int]v // ERROR "invalid map key"
_ map[func()]v // ERROR "invalid map key"
_ map[map[int]int]v // ERROR "invalid map key"
)

1
test/recover2.go
View File

@ -60,6 +60,7 @@ func test4() {
type T struct {
a, b int
c []int
}
func test5() {