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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