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[dev.inline] cmd/internal/obj: remove vestiges of LineHist - not used anymore

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Change-Id: I9d3fcdd5b002953fa9d2f001bf7a834073443794
Reviewed-on: https://go-review.googlesource.com/34722
TryBot-Result: Gobot Gobot <gobot@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Robert Griesemer 2016-12-28 17:58:51 -08:00
parent 472c792e0a
commit 33c036867f
5 changed files with 7 additions and 250 deletions
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9
src/cmd/compile/internal/gc/main.go
View file

@ -778,7 +778,8 @@ func importfile(f *Val, indent []byte) {
defer impf.Close()
imp := bufio.NewReader(impf)
if strings.HasSuffix(file, ".a") {
const pkgSuffix = ".a"
if strings.HasSuffix(file, pkgSuffix) {
if !skiptopkgdef(imp) {
yyerror("import %s: not a package file", file)
errorexit()
@ -826,9 +827,9 @@ func importfile(f *Val, indent []byte) {
yyerror("cannot import unsafe package %q", importpkg.Path)
}
// assume files move (get installed)
// so don't record the full path.
linehistpragma(file[len(file)-len(path_)-2:]) // acts as #pragma lib
// assume files move (get installed) so don't record the full path
// (e.g., for file "/Users/foo/go/pkg/darwin_amd64/math.a" record "math.a")
Ctxt.AddImport(file[len(file)-len(path_)-len(pkgSuffix):])
// In the importfile, if we find:
// $$\n (textual format): not supported anymore

8
src/cmd/compile/internal/gc/subr.go
View file

@ -180,14 +180,6 @@ func Fatalf(fmt_ string, args ...interface{}) {
errorexit()
}
// TODO(gri) rename this function
func linehistpragma(file string) {
// if Debug['i'] != 0 {
// fmt.Printf("pragma %s at line %v\n", file, linestr(lexlineno))
// }
Ctxt.AddImport(file)
}
func setlineno(n *Node) src.XPos {
lno := lineno
if n != nil {

232
src/cmd/internal/obj/line.go
View file

@ -6,86 +6,9 @@ package obj
import (
"cmd/internal/src"
"fmt"
"path/filepath"
"sort"
"strings"
)
// LineHists are not used anymore. This code is only here for reference during a transition period.
// TODO(gri) remove this eventually (we still need the LineHist independent functions, though).
// 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>".
dir := h.Dir
if stk.Directive || strings.HasPrefix(file, "<") {
dir = ""
}
stk.AbsFile = AbsFile(dir, file, h.TrimPathPrefix)
if file == "" {
file = "??"
}
stk.File = file
}
// AbsFile returns the absolute filename for file in the given directory.
// It also removes a leading pathPrefix, or else rewrites a leading $GOROOT
// prefix to the literal "$GOROOT".
@ -146,161 +69,11 @@ func hasPathPrefix(s string, t string) bool {
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) {
panic("defunct")
// 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)))
}
// This is modified copy of linkgetline to work from src.Pos.
func linkgetlineFromPos(ctxt *Link, xpos src.XPos) (f *LSym, l int32) {
pos := ctxt.PosTable.Pos(xpos)
filename := pos.AbsFilename()
@ -311,11 +84,6 @@ func linkgetlineFromPos(ctxt *Link, xpos src.XPos) (f *LSym, l int32) {
return Linklookup(ctxt, filename, HistVersion), int32(pos.RelLine())
}
func Linkprfile(ctxt *Link, line int) {
panic("defunct")
// 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

4
src/cmd/internal/obj/link.go
View file

@ -222,8 +222,8 @@ const (
// The Progs for a given function are arranged in a list linked through the Link field.
//
// Each Prog is charged to a specific source line in the debug information,
// specified by Pos.Line(), an index into the line history (see LineHist).
// Every Prog has a Ctxt field that defines various context, including the current LineHist.
// specified by Pos.Line().
// Every Prog has a Ctxt field that defines its context.
// Progs should be allocated using ctxt.NewProg(), not new(Prog).
//
// The other fields not yet mentioned are for use by the back ends and should

4
src/cmd/internal/obj/sym.go
View file

@ -56,10 +56,6 @@ func Linknew(arch *LinkArch) *Link {
ctxt.Version = HistVersion
ctxt.Pathname = WorkingDir()
// LineHist is not used anymore
// ctxt.LineHist.GOROOT = GOROOT
// ctxt.LineHist.Dir = ctxt.Pathname
ctxt.Headtype.Set(GOOS)
if ctxt.Headtype < 0 {
log.Fatalf("unknown goos %s", GOOS)