Description
Go version
go version devel go1.22-8e658eee9c Wed Jan 17 03:56:30 2024 +0000 linux/arm64
Output of go env in your module/workspace:
GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOCACHE='/home/ayke/.cache/go-build'
GOENV='/home/ayke/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/home/ayke/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/home/ayke'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/home/ayke/src/tinygo/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/home/ayke/src/tinygo/go/pkg/tool/linux_arm64'
GOVCS=''
GOVERSION='devel go1.22-8e658eee9c Wed Jan 17 03:56:30 2024 +0000'
GCCGO='gccgo'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/dev/null'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build2139171962=/tmp/go-build -gno-record-gcc-switches'What did you do?
I ran the following program in Go 1.22 (tip):
package main
func main() {
for range 1 << 64 {
}
}On the Playground: https://go.dev/play/p/MCs2ntWII_I?v=gotip
What did you see happen?
The compiler crashes with the following stack trace:
# command-line-arguments
./test.go:4:6: internal compiler error: 18446744073709551616 out of range for uint
goroutine 21 [running]:
runtime/debug.Stack()
./src/runtime/debug/stack.go:24 +0x64
cmd/compile/internal/base.FatalfAt({0xabbaf8?, 0x0?}, {0x95b435, 0x16}, {0x40004ee6f8, 0x2, 0x2})
./src/cmd/compile/internal/base/print.go:225 +0x1fc
cmd/compile/internal/base.Fatalf(...)
./src/cmd/compile/internal/base/print.go:194
cmd/compile/internal/ir.IntVal(0x400047e480, {0xabbaf8?, 0x40000dea60?})
./src/cmd/compile/internal/ir/val.go:33 +0x1a0
cmd/compile/internal/ssagen.(*state).exprCheckPtr(0x4000210300, {0xac4818, 0x40004d0730}, 0x1)
./src/cmd/compile/internal/ssagen/ssa.go:2826 +0x9fc
cmd/compile/internal/ssagen.(*state).expr(...)
./src/cmd/compile/internal/ssagen/ssa.go:2756
cmd/compile/internal/ssagen.(*state).stmt(0x4000210300, {0xac4158, 0x40004d0d70})
./src/cmd/compile/internal/ssagen/ssa.go:1679 +0x5ce8
cmd/compile/internal/ssagen.(*state).stmtList(...)
./src/cmd/compile/internal/ssagen/ssa.go:1426
cmd/compile/internal/ssagen.(*state).stmt(0x4000210300, {0xac42d8, 0x40000d50a0})
./src/cmd/compile/internal/ssagen/ssa.go:1441 +0x210
cmd/compile/internal/ssagen.(*state).stmtList(...)
./src/cmd/compile/internal/ssagen/ssa.go:1426
cmd/compile/internal/ssagen.buildssa(0x40004c8fc0, 0x3)
./src/cmd/compile/internal/ssagen/ssa.go:555 +0x1f34
cmd/compile/internal/ssagen.Compile(0x40004c8fc0, 0x3)
./src/cmd/compile/internal/ssagen/pgen.go:216 +0x30
cmd/compile/internal/gc.compileFunctions.func5.1(0x40004d2080?)
./src/cmd/compile/internal/gc/compile.go:182 +0x3c
cmd/compile/internal/gc.compileFunctions.func3.1()
./src/cmd/compile/internal/gc/compile.go:164 +0x3c
created by cmd/compile/internal/gc.compileFunctions.func3 in goroutine 20
./src/cmd/compile/internal/gc/compile.go:163 +0x1e0
What did you expect to see?
This code should probably show a regular compiler error because the integer is out of range.
This is what the specification says:
For an integer value n, the iteration values 0 through n-1 are produced in increasing order, with the same type as n. If n <= 0, the loop does not run any iterations.
This doesn't explicitly say which type should be used for untyped integers. My assumption would be that it would be the same as this for example:
n := 5...meaning that it would default to int (not uint as the stack trace suggests). uint would also seem reasonable to me for range loops, which would be a bit inconsistent but would make sense for range loops.
In fact, the following code does compile, but I'm not sure it should (it is out of range for int):
package main
func main() {
for range 1 << 63 {
}
}