cmd/objdump: print Go code alongside assembly
Added -S flag to print go source file line above corresponding disassembly:
$ go tool objdump -S -s main.main fmthello
TEXT main.main(SB) /home/rugginoso/Documents/src/go/src/cmd/objdump/testdata/fmthello.go
func main() {
0x47d450
64488b0c25f8ffffff FS MOVQ FS:0xfffffff8, CX
0x47d459
483b6110 CMPQ 0x10(CX), SP
0x47d45d 7631 JBE 0x47d490
0x47d45f
4883ec18 SUBQ $0x18, SP
0x47d463
48896c2410 MOVQ BP, 0x10(SP)
0x47d468
488d6c2410 LEAQ 0x10(SP), BP
Println("hello, world")
0x47d46d
488d0563b00200 LEAQ 0x2b063(IP), AX
0x47d474
48890424 MOVQ AX, 0(SP)
0x47d478
48c74424080c000000 MOVQ $0xc, 0x8(SP)
0x47d481
e81a000000 CALL main.Println(SB)
}
0x47d486
488b6c2410 MOVQ 0x10(SP), BP
0x47d48b
4883c418 ADDQ $0x18, SP
0x47d48f c3 RET
func main() {
0x47d490
e8ebf1fcff CALL runtime.morestack_noctxt(SB)
0x47d495 ebb9 JMP main.main(SB)
Execution time:
$ time go tool objdump testdata/fmthello > /dev/null
real 0m0.430s
user 0m0.440s
sys 0m0.000s
$ time go tool objdump -S testdata/fmthello > /dev/null
real 0m0.471s
user 0m0.476s
sys 0m0.012s
Fixes #18245
Change-Id: I9b2f8338f9ee443c1352efd270d3ba85e3dd9b78
Reviewed-on: https://go-review.googlesource.com/37953
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>