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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 "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, 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
}