diff options
Diffstat (limited to 'src/pkg/debug/dwarf/buf.go')
| -rw-r--r-- | src/pkg/debug/dwarf/buf.go | 48 |
1 files changed, 38 insertions, 10 deletions
diff --git a/src/pkg/debug/dwarf/buf.go b/src/pkg/debug/dwarf/buf.go index 6dc28d256..53c46eb4b 100644 --- a/src/pkg/debug/dwarf/buf.go +++ b/src/pkg/debug/dwarf/buf.go @@ -13,17 +13,45 @@ import ( // Data buffer being decoded. type buf struct { - dwarf *Data - order binary.ByteOrder - name string - off Offset - data []byte - addrsize int - err error + dwarf *Data + order binary.ByteOrder + format dataFormat + name string + off Offset + data []byte + err error } -func makeBuf(d *Data, name string, off Offset, data []byte, addrsize int) buf { - return buf{d, d.order, name, off, data, addrsize, nil} +// Data format, other than byte order. This affects the handling of +// certain field formats. +type dataFormat interface { + // DWARF version number. Zero means unknown. + version() int + + // 64-bit DWARF format? + dwarf64() (dwarf64 bool, isKnown bool) + + // Size of an address, in bytes. Zero means unknown. + addrsize() int +} + +// Some parts of DWARF have no data format, e.g., abbrevs. +type unknownFormat struct{} + +func (u unknownFormat) version() int { + return 0 +} + +func (u unknownFormat) dwarf64() (bool, bool) { + return false, false +} + +func (u unknownFormat) addrsize() int { + return 0 +} + +func makeBuf(d *Data, format dataFormat, name string, off Offset, data []byte) buf { + return buf{d, d.order, format, name, off, data, nil} } func (b *buf) uint8() uint8 { @@ -121,7 +149,7 @@ func (b *buf) int() int64 { // Address-sized uint. func (b *buf) addr() uint64 { - switch b.addrsize { + switch b.format.addrsize() { case 1: return uint64(b.uint8()) case 2: |