summaryrefslogtreecommitdiffstats
path: root/vendor/github.com/google/gops/internal/obj/obj.go
diff options
context:
space:
mode:
authorWim <wim@42.be>2018-08-06 21:47:05 +0200
committerWim <wim@42.be>2018-08-06 21:47:05 +0200
commit51062863a5c34d81e296cf15c61140911037cf3b (patch)
tree9b5e044672486326c7a0ca8fb26430f37bf4d83c /vendor/github.com/google/gops/internal/obj/obj.go
parent4fb4b7aa6c02a54db8ad8dd98e4d321396926c0d (diff)
downloadmatterbridge-msglm-51062863a5c34d81e296cf15c61140911037cf3b.tar.gz
matterbridge-msglm-51062863a5c34d81e296cf15c61140911037cf3b.tar.bz2
matterbridge-msglm-51062863a5c34d81e296cf15c61140911037cf3b.zip
Use mod vendor for vendored directory (backwards compatible)
Diffstat (limited to 'vendor/github.com/google/gops/internal/obj/obj.go')
-rw-r--r--vendor/github.com/google/gops/internal/obj/obj.go306
1 files changed, 0 insertions, 306 deletions
diff --git a/vendor/github.com/google/gops/internal/obj/obj.go b/vendor/github.com/google/gops/internal/obj/obj.go
deleted file mode 100644
index 566263d3..00000000
--- a/vendor/github.com/google/gops/internal/obj/obj.go
+++ /dev/null
@@ -1,306 +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.
-
-package obj
-
-import (
- "fmt"
- "path/filepath"
- "sort"
- "strings"
-)
-
-// A LineHist records the history of the file input stack, which maps the virtual line number,
-// an incrementing count of lines processed in any input file and typically named lineno,
-// to a stack of file:line pairs showing the path of inclusions that led to that position.
-// The first line directive (//line in Go, #line in assembly) is treated as pushing
-// a new entry on the stack, so that errors can report both the actual and translated
-// line number.
-//
-// In typical use, the virtual lineno begins at 1, and file line numbers also begin at 1,
-// but the only requirements placed upon the numbers by this code are:
-// - calls to Push, Update, and Pop must be monotonically increasing in lineno
-// - except as specified by those methods, virtual and file line number increase
-// together, so that given (only) calls Push(10, "x.go", 1) and Pop(15),
-// virtual line 12 corresponds to x.go line 3.
-type LineHist struct {
- Top *LineStack // current top of stack
- Ranges []LineRange // ranges for lookup
- Dir string // directory to qualify relative paths
- TrimPathPrefix string // remove leading TrimPath from recorded file names
- PrintFilenameOnly bool // ignore path when pretty-printing a line; internal use only
- GOROOT string // current GOROOT
-}
-
-// A LineStack is an entry in the recorded line history.
-// Although the history at any given line number is a stack,
-// the record for all line processed forms a tree, with common
-// stack prefixes acting as parents.
-type LineStack struct {
- Parent *LineStack // parent in inclusion stack
- Lineno int // virtual line number where this entry takes effect
- File string // file name used to open source file, for error messages
- AbsFile string // absolute file name, for pcln tables
- FileLine int // line number in file at Lineno
- Directive bool
- Sym *LSym // for linkgetline - TODO(rsc): remove
-}
-
-func (stk *LineStack) fileLineAt(lineno int) int {
- return stk.FileLine + lineno - stk.Lineno
-}
-
-// The span of valid linenos in the recorded line history can be broken
-// into a set of ranges, each with a particular stack.
-// A LineRange records one such range.
-type LineRange struct {
- Start int // starting lineno
- Stack *LineStack // top of stack for this range
-}
-
-// startRange starts a new range with the given top of stack.
-func (h *LineHist) startRange(lineno int, top *LineStack) {
- h.Top = top
- h.Ranges = append(h.Ranges, LineRange{top.Lineno, top})
-}
-
-// setFile sets stk.File = file and also derives stk.AbsFile.
-func (h *LineHist) setFile(stk *LineStack, file string) {
- // Note: The exclusion of stk.Directive may be wrong but matches what we've done before.
- // The check for < avoids putting a path prefix on "<autogenerated>".
- abs := file
- if h.Dir != "" && !filepath.IsAbs(file) && !strings.HasPrefix(file, "<") && !stk.Directive {
- abs = filepath.Join(h.Dir, file)
- }
-
- // Remove leading TrimPathPrefix, or else rewrite $GOROOT to literal $GOROOT.
- if h.TrimPathPrefix != "" && hasPathPrefix(abs, h.TrimPathPrefix) {
- if abs == h.TrimPathPrefix {
- abs = ""
- } else {
- abs = abs[len(h.TrimPathPrefix)+1:]
- }
- } else if hasPathPrefix(abs, h.GOROOT) {
- abs = "$GOROOT" + abs[len(h.GOROOT):]
- }
- if abs == "" {
- abs = "??"
- }
- abs = filepath.Clean(abs)
- stk.AbsFile = abs
-
- if file == "" {
- file = "??"
- }
- stk.File = file
-}
-
-// Does s have t as a path prefix?
-// That is, does s == t or does s begin with t followed by a slash?
-// For portability, we allow ASCII case folding, so that hasPathPrefix("a/b/c", "A/B") is true.
-// Similarly, we allow slash folding, so that hasPathPrefix("a/b/c", "a\\b") is true.
-// We do not allow full Unicode case folding, for fear of causing more confusion
-// or harm than good. (For an example of the kinds of things that can go wrong,
-// see http://article.gmane.org/gmane.linux.kernel/1853266.)
-func hasPathPrefix(s string, t string) bool {
- if len(t) > len(s) {
- return false
- }
- var i int
- for i = 0; i < len(t); i++ {
- cs := int(s[i])
- ct := int(t[i])
- if 'A' <= cs && cs <= 'Z' {
- cs += 'a' - 'A'
- }
- if 'A' <= ct && ct <= 'Z' {
- ct += 'a' - 'A'
- }
- if cs == '\\' {
- cs = '/'
- }
- if ct == '\\' {
- ct = '/'
- }
- if cs != ct {
- return false
- }
- }
- return i >= len(s) || s[i] == '/' || s[i] == '\\'
-}
-
-// Push records that at that lineno a new file with the given name was pushed onto the input stack.
-func (h *LineHist) Push(lineno int, file string) {
- stk := &LineStack{
- Parent: h.Top,
- Lineno: lineno,
- FileLine: 1,
- }
- h.setFile(stk, file)
- h.startRange(lineno, stk)
-}
-
-// Pop records that at lineno the current file was popped from the input stack.
-func (h *LineHist) Pop(lineno int) {
- top := h.Top
- if top == nil {
- return
- }
- if top.Directive && top.Parent != nil { // pop #line level too
- top = top.Parent
- }
- next := top.Parent
- if next == nil {
- h.Top = nil
- h.Ranges = append(h.Ranges, LineRange{lineno, nil})
- return
- }
-
- // Popping included file. Update parent offset to account for
- // the virtual line number range taken by the included file.
- // Cannot modify the LineStack directly, or else lookups
- // for the earlier line numbers will get the wrong answers,
- // so make a new one.
- stk := new(LineStack)
- *stk = *next
- stk.Lineno = lineno
- stk.FileLine = next.fileLineAt(top.Lineno)
- h.startRange(lineno, stk)
-}
-
-// Update records that at lineno the file name and line number were changed using
-// a line directive (//line in Go, #line in assembly).
-func (h *LineHist) Update(lineno int, file string, line int) {
- top := h.Top
- if top == nil {
- return // shouldn't happen
- }
- var stk *LineStack
- if top.Directive {
- // Update existing entry, except make copy to avoid changing earlier history.
- stk = new(LineStack)
- *stk = *top
- } else {
- // Push new entry.
- stk = &LineStack{
- Parent: top,
- Directive: true,
- }
- }
- stk.Lineno = lineno
- if stk.File != file {
- h.setFile(stk, file) // only retain string if needed
- }
- stk.FileLine = line
- h.startRange(lineno, stk)
-}
-
-// AddImport adds a package to the list of imported packages.
-func (ctxt *Link) AddImport(pkg string) {
- ctxt.Imports = append(ctxt.Imports, pkg)
-}
-
-// At returns the input stack in effect at lineno.
-func (h *LineHist) At(lineno int) *LineStack {
- i := sort.Search(len(h.Ranges), func(i int) bool {
- return h.Ranges[i].Start > lineno
- })
- // Found first entry beyond lineno.
- if i == 0 {
- return nil
- }
- return h.Ranges[i-1].Stack
-}
-
-// LineString returns a string giving the file and line number
-// corresponding to lineno, for use in error messages.
-func (h *LineHist) LineString(lineno int) string {
- stk := h.At(lineno)
- if stk == nil {
- return "<unknown line number>"
- }
-
- filename := stk.File
- if h.PrintFilenameOnly {
- filename = filepath.Base(filename)
- }
- text := fmt.Sprintf("%s:%d", filename, stk.fileLineAt(lineno))
- if stk.Directive && stk.Parent != nil {
- stk = stk.Parent
- filename = stk.File
- if h.PrintFilenameOnly {
- filename = filepath.Base(filename)
- }
- text += fmt.Sprintf("[%s:%d]", filename, stk.fileLineAt(lineno))
- }
- const showFullStack = false // was used by old C compilers
- if showFullStack {
- for stk.Parent != nil {
- lineno = stk.Lineno - 1
- stk = stk.Parent
- text += fmt.Sprintf(" %s:%d", filename, stk.fileLineAt(lineno))
- if stk.Directive && stk.Parent != nil {
- stk = stk.Parent
- text += fmt.Sprintf("[%s:%d]", filename, stk.fileLineAt(lineno))
- }
- }
- }
- return text
-}
-
-// FileLine returns the file name and line number
-// at the top of the stack for the given lineno.
-func (h *LineHist) FileLine(lineno int) (file string, line int) {
- stk := h.At(lineno)
- if stk == nil {
- return "??", 0
- }
- return stk.File, stk.fileLineAt(lineno)
-}
-
-// AbsFileLine returns the absolute file name and line number
-// at the top of the stack for the given lineno.
-func (h *LineHist) AbsFileLine(lineno int) (file string, line int) {
- stk := h.At(lineno)
- if stk == nil {
- return "??", 0
- }
- return stk.AbsFile, stk.fileLineAt(lineno)
-}
-
-// This is a simplified copy of linklinefmt above.
-// It doesn't allow printing the full stack, and it returns the file name and line number separately.
-// TODO: Unify with linklinefmt somehow.
-func linkgetline(ctxt *Link, lineno int32) (f *LSym, l int32) {
- stk := ctxt.LineHist.At(int(lineno))
- if stk == nil || stk.AbsFile == "" {
- return Linklookup(ctxt, "??", HistVersion), 0
- }
- if stk.Sym == nil {
- stk.Sym = Linklookup(ctxt, stk.AbsFile, HistVersion)
- }
- return stk.Sym, int32(stk.fileLineAt(int(lineno)))
-}
-
-func Linkprfile(ctxt *Link, line int) {
- fmt.Printf("%s ", ctxt.LineHist.LineString(line))
-}
-
-func fieldtrack(ctxt *Link, cursym *LSym) {
- p := cursym.Text
- if p == nil || p.Link == nil { // handle external functions and ELF section symbols
- return
- }
- ctxt.Cursym = cursym
-
- for ; p != nil; p = p.Link {
- if p.As == AUSEFIELD {
- r := Addrel(ctxt.Cursym)
- r.Off = 0
- r.Siz = 0
- r.Sym = p.From.Sym
- r.Type = R_USEFIELD
- }
- }
-}