There is an issue for this: https://github.com/golang/go/issues/17378
On Sunday, November 14, 2021 at 1:46:29 AM UTC+8 arthurwil...@gmail.com
wrote:
> On a 64bit Mac, this code:
>
> package main
>
> var X [^uint(0)>>14]byte
> func main() {
> }
>
> produces a compile time error:
> main.X: symbol too large (1125899906842623 bytes > 2000000000 bytes)
>
> But this compiles and crashes at runtime.
>
> package main
>
> func main() {
> var X [^uint(0) >> 14]byte
> _ = X
> }
>
> runtime: out of memory: cannot allocate 1125899906842624-byte block
> (3997696 in use)
> fatal error: out of memory
>
> goroutine 1 [running]:
> runtime.throw({0x1061335, 0x11})
> /usr/local/go/src/runtime/panic.go:1198 +0x71 fp=0xc000042658
> sp=0xc000042628 pc=0x102b031
> runtime.(*mcache).allocLarge(0x100a734, 0x3ffffffffffff, 0x11, 0x1)
> /usr/local/go/src/runtime/mcache.go:229 +0x22e fp=0xc0000426b8
> sp=0xc000042658 pc=0x101086e
> runtime.mallocgc(0x3ffffffffffff, 0x1059300, 0x1)
> /usr/local/go/src/runtime/malloc.go:1082 +0x5c5 fp=0xc000042738
> sp=0xc0000426b8 pc=0x100a645
> runtime.newobject(0x1058a00)
> /usr/local/go/src/runtime/malloc.go:1228 +0x27 fp=0xc000042760
> sp=0xc000042738 pc=0x100aa87
> main.main()
> /Users/billmorgan/git/tmp/main.go:5 +0x25 fp=0xc000042780
> sp=0xc000042760 pc=0x1054c65
> runtime.main()
> /usr/local/go/src/runtime/proc.go:255 +0x227 fp=0xc0000427e0
> sp=0xc000042780 pc=0x102d6c7
> runtime.goexit()
> /usr/local/go/src/runtime/asm_amd64.s:1581 +0x1 fp=0xc0000427e8
> sp=0xc0000427e0 pc=0x1051fa1
>
>
> Why does the 2nd program succeed compilation of the same array that failed
> compilation in the 1st program?
>
> It was known ahead of time that the allocation would fail so I think the
> 2nd program should have failed to compile too.
>
>
>
>
>
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