cmd/cgo: limit of C.CBytes #53965
Description
What version of Go are you using (go version)?
$ go version go version go1.15.6 windows/amd64
Does this issue reproduce with the latest release?
yes
What operating system and processor architecture are you using (go env)?
go env Output
$ go env GOROOT/bin/go version: go version go1.15.6 windows/amd64 GOROOT/bin/go tool compile -V: compile version go1.15.6 gdb --version: GNU gdb (GDB) 8.1
What did you do?
package main
/*
#include <stdio.h>
void cprint(char * s) {
printf("char %c\n", s[1024*1024*1024-1]);
printf("char %c\n", s[1024*1024*1024]);
}
*/
import "C"
func main() {
bs := make([]byte, 1<<30+10)
bs[1024*1024*1024-1] = 'a'
bs[1024*1024*1024] = 'b'
t := C.CBytes(bs)
C.cprint((*C.char)(t))
}
What did you expect to see?
char a
char b
What did you see instead?
char a
char