Closed
Description
What version of Go are you using (go version)?
$ go version go version go1.15.2 darwin/amd64
Does this issue reproduce with the latest release?
it seem all the version the same result
What operating system and processor architecture are you using (go env)?
go env Output
$ go env GO111MODULE="on" GOARCH="amd64" GOBIN="/usr/local/bin/" GOCACHE="/Users/haohongfan/Library/Caches/go-build" GOENV="/Users/haohongfan/Library/Application Support/go/env" GOEXE="" GOFLAGS="" GOHOSTARCH="amd64" GOHOSTOS="darwin" GOINSECURE="" GOMODCACHE="/Users/haohongfan/go/pkg/mod" GONOPROXY="git.zuoyebang.cc" GONOSUMDB="git.zuoyebang.cc" GOOS="darwin" GOPATH="/Users/haohongfan/go" GOPRIVATE="git.zuoyebang.cc" GOPROXY="https://goproxy.cn,direct" GOROOT="/Users/haohongfan/sdk/go1.15.2" GOSUMDB="sum.golang.org" GOTMPDIR="" GOTOOLDIR="/Users/haohongfan/sdk/go1.15.2/pkg/tool/darwin_amd64" GCCGO="gccgo" AR="ar" CC="clang" CXX="clang++" CGO_ENABLED="1" GOMOD="/Users/haohongfan/goproject/test/go.mod" CGO_CFLAGS="-g -O2" CGO_CPPFLAGS="" CGO_CXXFLAGS="-g -O2" CGO_FFLAGS="-g -O2" CGO_LDFLAGS="-g -O2" PKG_CONFIG="pkg-config" GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/9q/mcmf4t9x6qgf9bc4x83nvl5m0000gn/T/go-build978115702=/tmp/go-build -gno-record-gcc-switches -fno-common"
What did you do?
package main
func a() []int {
a1 := []int{1}
a2 := a1[1:]
return a2
}
func main() {
a()
}
I also get the asm
"".a STEXT size=87 args=0x18 locals=0x18
0x0000 00000 (main.go:3) TEXT "".a(SB), ABIInternal, $24-24
0x0000 00000 (main.go:3) MOVQ (TLS), CX
0x0009 00009 (main.go:3) CMPQ SP, 16(CX)
0x000d 00013 (main.go:3) PCDATA $0, $-2
0x000d 00013 (main.go:3) JLS 80
0x000f 00015 (main.go:3) PCDATA $0, $-1
0x000f 00015 (main.go:3) SUBQ $24, SP
0x0013 00019 (main.go:3) MOVQ BP, 16(SP)
0x0018 00024 (main.go:3) LEAQ 16(SP), BP
0x001d 00029 (main.go:3) FUNCDATA $0, gclocals·2a5305abe05176240e61b8620e19a815(SB)
0x001d 00029 (main.go:3) FUNCDATA $1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
0x001d 00029 (main.go:4) LEAQ type.[1]int(SB), AX
0x0024 00036 (main.go:4) MOVQ AX, (SP)
0x0028 00040 (main.go:4) PCDATA $1, $0
0x0028 00040 (main.go:4) CALL runtime.newobject(SB)
0x002d 00045 (main.go:4) MOVQ 8(SP), AX
0x0032 00050 (main.go:4) MOVQ $1, (AX)
0x0039 00057 (main.go:6) MOVQ AX, "".~r0+32(SP)
0x003e 00062 (main.go:6) XORPS X0, X0
0x0041 00065 (main.go:6) MOVUPS X0, "".~r0+40(SP)
0x0046 00070 (main.go:6) MOVQ 16(SP), BP
0x004b 00075 (main.go:6) ADDQ $24, SP
0x004f 00079 (main.go:6) RET
0x0050 00080 (main.go:6) NOP
0x0050 00080 (main.go:3) PCDATA $1, $-1
0x0050 00080 (main.go:3) PCDATA $0, $-2
0x0050 00080 (main.go:3) CALL runtime.morestack_noctxt(SB)
0x0055 00085 (main.go:3) PCDATA $0, $-1
0x0055 00085 (main.go:3) JMP 0
0x0000 65 48 8b 0c 25 00 00 00 00 48 3b 61 10 76 41 48 eH..%....H;a.vAH
0x0010 83 ec 18 48 89 6c 24 10 48 8d 6c 24 10 48 8d 05 ...H.l$.H.l$.H..
0x0020 00 00 00 00 48 89 04 24 e8 00 00 00 00 48 8b 44 ....H..$.....H.D
0x0030 24 08 48 c7 00 01 00 00 00 48 89 44 24 20 0f 57 $.H......H.D$ .W
0x0040 c0 0f 11 44 24 28 48 8b 6c 24 10 48 83 c4 18 c3 ...D$(H.l$.H....
0x0050 e8 00 00 00 00 eb a9 .......
rel 5+4 t=17 TLS+0
rel 32+4 t=16 type.[1]int+0
rel 41+4 t=8 runtime.newobject+0
rel 81+4 t=8 runtime.morestack_noctxt+0
See here, i just not check the out of index
0x002d 00045 (main.go:4) MOVQ 8(SP), AX
0x0032 00050 (main.go:4) MOVQ $1, (AX)
0x0039 00057 (main.go:6) MOVQ AX, "".~r0+32(SP)
What did you expect to see?
panic
What did you see instead?
empty