63 lines
1.3 KiB
Go
63 lines
1.3 KiB
Go
|
// Copyright 2009 The Go Authors. All rights reserved.
|
||
|
// Use of this source code is governed by a BSD-style
|
||
|
// license that can be found in the LICENSE file.
|
||
|
|
||
|
package dwarf
|
||
|
|
||
|
import (
|
||
|
"os"
|
||
|
"strconv"
|
||
|
)
|
||
|
|
||
|
// DWARF debug info is split into a sequence of compilation units.
|
||
|
// Each unit has its own abbreviation table and address size.
|
||
|
|
||
|
type unit struct {
|
||
|
base Offset // byte offset of header within the aggregate info
|
||
|
off Offset // byte offset of data within the aggregate info
|
||
|
data []byte
|
||
|
atable abbrevTable
|
||
|
addrsize int
|
||
|
}
|
||
|
|
||
|
func (d *Data) parseUnits() ([]unit, os.Error) {
|
||
|
// Count units.
|
||
|
nunit := 0
|
||
|
b := makeBuf(d, "info", 0, d.info, 0)
|
||
|
for len(b.data) > 0 {
|
||
|
b.skip(int(b.uint32()))
|
||
|
nunit++
|
||
|
}
|
||
|
if b.err != nil {
|
||
|
return nil, b.err
|
||
|
}
|
||
|
|
||
|
// Again, this time writing them down.
|
||
|
b = makeBuf(d, "info", 0, d.info, 0)
|
||
|
units := make([]unit, nunit)
|
||
|
for i := range units {
|
||
|
u := &units[i]
|
||
|
u.base = b.off
|
||
|
n := b.uint32()
|
||
|
if vers := b.uint16(); vers != 2 {
|
||
|
b.error("unsupported DWARF version " + strconv.Itoa(int(vers)))
|
||
|
break
|
||
|
}
|
||
|
atable, err := d.parseAbbrev(b.uint32())
|
||
|
if err != nil {
|
||
|
if b.err == nil {
|
||
|
b.err = err
|
||
|
}
|
||
|
break
|
||
|
}
|
||
|
u.atable = atable
|
||
|
u.addrsize = int(b.uint8())
|
||
|
u.off = b.off
|
||
|
u.data = b.bytes(int(n - (2 + 4 + 1)))
|
||
|
}
|
||
|
if b.err != nil {
|
||
|
return nil, b.err
|
||
|
}
|
||
|
return units, nil
|
||
|
}
|