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path: root/src/pkg/debug/gosym/pclntab.go
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Diffstat (limited to 'src/pkg/debug/gosym/pclntab.go')
-rw-r--r--src/pkg/debug/gosym/pclntab.go82
1 files changed, 0 insertions, 82 deletions
diff --git a/src/pkg/debug/gosym/pclntab.go b/src/pkg/debug/gosym/pclntab.go
deleted file mode 100644
index 9d7b0d15f..000000000
--- a/src/pkg/debug/gosym/pclntab.go
+++ /dev/null
@@ -1,82 +0,0 @@
-// 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.
-
-/*
- * Line tables
- */
-
-package gosym
-
-import "encoding/binary"
-
-type LineTable struct {
- Data []byte
- PC uint64
- Line int
-}
-
-// TODO(rsc): Need to pull in quantum from architecture definition.
-const quantum = 1
-
-func (t *LineTable) parse(targetPC uint64, targetLine int) (b []byte, pc uint64, line int) {
- // The PC/line table can be thought of as a sequence of
- // <pc update>* <line update>
- // batches. Each update batch results in a (pc, line) pair,
- // where line applies to every PC from pc up to but not
- // including the pc of the next pair.
- //
- // Here we process each update individually, which simplifies
- // the code, but makes the corner cases more confusing.
- b, pc, line = t.Data, t.PC, t.Line
- for pc <= targetPC && line != targetLine && len(b) > 0 {
- code := b[0]
- b = b[1:]
- switch {
- case code == 0:
- if len(b) < 4 {
- b = b[0:0]
- break
- }
- val := binary.BigEndian.Uint32(b)
- b = b[4:]
- line += int(val)
- case code <= 64:
- line += int(code)
- case code <= 128:
- line -= int(code - 64)
- default:
- pc += quantum * uint64(code-128)
- continue
- }
- pc += quantum
- }
- return b, pc, line
-}
-
-func (t *LineTable) slice(pc uint64) *LineTable {
- data, pc, line := t.parse(pc, -1)
- return &LineTable{data, pc, line}
-}
-
-func (t *LineTable) PCToLine(pc uint64) int {
- _, _, line := t.parse(pc, -1)
- return line
-}
-
-func (t *LineTable) LineToPC(line int, maxpc uint64) uint64 {
- _, pc, line1 := t.parse(maxpc, line)
- if line1 != line {
- return 0
- }
- // Subtract quantum from PC to account for post-line increment
- return pc - quantum
-}
-
-// NewLineTable returns a new PC/line table
-// corresponding to the encoded data.
-// Text must be the start address of the
-// corresponding text segment.
-func NewLineTable(data []byte, text uint64) *LineTable {
- return &LineTable{data, text, 0}
-}