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// 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
}
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