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misc/cgo/gmp: update for Go 1

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1. make the program go buildable
2. update os.EINVAL and runtime.Cgocalls()
3. wrap mpz_div_2exp() and mpz_mul_2exp to support both
   pre-5.0 and post-5.0 gmp (we really have no reason to
   restrict ourselves to gmp 5.0+)

R=golang-dev, remyoudompheng, iant
CC=golang-dev
https://golang.org/cl/5847061
This commit is contained in:
Shenghou Ma 2012-03-21 00:51:48 +08:00
parent 4b1933dfb2
commit 1abd8d8fd0
2 changed files with 19 additions and 7 deletions
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24
misc/cgo/gmp/gmp.go
View File

@ -98,8 +98,20 @@ Go to hang on to a reference to the pointer until C is done with it.
*/
package gmp
// #include <gmp.h>
// #include <stdlib.h>
/*
#cgo LDFLAGS: -lgmp
#include <gmp.h>
#include <stdlib.h>
// gmp 5.0.0+ changed the type of the 3rd argument to mp_bitcnt_t,
// so, to support older versions, we wrap these two functions.
void _mpz_mul_2exp(mpz_ptr a, mpz_ptr b, unsigned long n) {
mpz_mul_2exp(a, b, n);
}
void _mpz_div_2exp(mpz_ptr a, mpz_ptr b, unsigned long n) {
mpz_div_2exp(a, b, n);
}
*/
import "C"
import (
@ -182,12 +194,12 @@ func (z *Int) SetInt64(x int64) *Int {
func (z *Int) SetString(s string, base int) error {
z.doinit()
if base < 2 || base > 36 {
return os.EINVAL
return os.ErrInvalid
}
p := C.CString(s)
defer C.free(unsafe.Pointer(p))
if C.mpz_set_str(&z.i[0], p, C.int(base)) < 0 {
return os.EINVAL
return os.ErrInvalid
}
return nil
}
@ -265,7 +277,7 @@ func (z *Int) Mod(x, y *Int) *Int {
func (z *Int) Lsh(x *Int, s uint) *Int {
x.doinit()
z.doinit()
C.mpz_mul_2exp(&z.i[0], &x.i[0], C.mp_bitcnt_t(s))
C._mpz_mul_2exp(&z.i[0], &x.i[0], C.ulong(s))
return z
}
@ -273,7 +285,7 @@ func (z *Int) Lsh(x *Int, s uint) *Int {
func (z *Int) Rsh(x *Int, s uint) *Int {
x.doinit()
z.doinit()
C.mpz_div_2exp(&z.i[0], &x.i[0], C.mp_bitcnt_t(s))
C._mpz_div_2exp(&z.i[0], &x.i[0], C.ulong(s))
return z
}

2
misc/cgo/gmp/pi.go
View File

@ -102,5 +102,5 @@ func main() {
}
}
fmt.Printf("\n%d calls; bit sizes: %d %d %d\n", runtime.Cgocalls(), numer.Len(), accum.Len(), denom.Len())
fmt.Printf("\n%d calls; bit sizes: %d %d %d\n", runtime.NumCgoCall(), numer.Len(), accum.Len(), denom.Len())
}