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add sys.BUG_intereq to compare interfaces for equality

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R=r
OCL=16929
CL=16929
This commit is contained in:
Russ Cox 2008-10-10 15:30:32 -07:00
parent e7c8e78879
commit 827dcb86b7
3 changed files with 20 additions and 0 deletions
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1
src/cmd/gc/sys.go
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@ -80,3 +80,4 @@ export func stringtorune(string, int32) (int32, int32); // convert bytes to rune
export func exit(int32);
export func BUG_intereq(a, b interface{}) bool; // should not be necessary

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

@ -68,5 +68,6 @@ char *sysimport =
"export func sys.bytestorune (? *sys.uint8, ? sys.int32, ? sys.int32) (? sys.int32, ? sys.int32)\n"
"export func sys.stringtorune (? sys.string, ? sys.int32) (? sys.int32, ? sys.int32)\n"
"export func sys.exit (? sys.int32)\n"
"export func sys.BUG_intereq (a interface { }, b interface { }) (? sys.bool)\n"
"\n"
"$$\n";

18
src/runtime/rt0_amd64.s
View File

@ -133,3 +133,21 @@ TEXT cas(SB), 7, $0
MOVL $1, AX
RET
// func BUG_intereq(a, b interface{}) bool {
// return a == b
// }
// TODO: delete once 6g can compile a == b on interfaces.
TEXT sys·BUG_intereq(SB),7,$0
// First interface at 8(SP) and 16(SP)
// Second interface at 24(SP) and 32(SP)
// Answer at 40(SP)
MOVQ 8(SP), AX
CMPQ AX, 24(SP)
JNE 6(PC)
MOVQ 16(SP), AX
CMPQ AX, 32(SP)
JNE 3(PC)
MOVQ $1, 40(SP)
RET
MOVQ $0, 40(SP)
RET