cmd/compile/internal/pgo: remove some unused fields

We intentionally don't use file path so it is resilient to code
moving. OrigName and Objfile are also not used currently. Remove
them. (We can add them back if it turns out to be useful.)

Change-Id: I7975d78c874bc21475b9119301088452a4426cb9
Reviewed-on: https://go-review.googlesource.com/c/go/+/447801
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

src/cmd/compile/internal/pgo/graph.go

@@ -21,7 +21,6 @@ import (
 	"fmt"
 	"internal/profile"
 	"math"
-	"path/filepath"
 	"sort"
 	"strings"
 )
@@ -30,9 +29,6 @@ import (
 type Options struct {
 	SampleValue       func(s []int64) int64 // Function to compute the value of a sample
 	SampleMeanDivisor func(s []int64) int64 // Function to compute the divisor for mean graphs, or nil
-	FormatTag         func(int64, string) string // Function to format a sample tag value into a string
-	ObjNames          bool                       // Always preserve obj filename
-	OrigFnNames       bool                       // Preserve original (eg mangled) function names
 
 	CallTree     bool // Build a tree instead of a graph
 	DropNegative bool // Drop nodes with overall negative values
@@ -122,11 +118,11 @@ func (n *Node) AddToEdgeDiv(to *Node, dv, v int64, residual, inline bool) {
 // NodeInfo contains the attributes for a node.
 type NodeInfo struct {
 	Name              string
-	OrigName          string
 	Address           uint64
-	File              string
 	StartLine, Lineno int
-	Objfile           string
+	//File            string
+	//OrigName        string
+	//Objfile         string
 }
 
 // PrintableName calls the Node's Formatter function with a single space separator.
@@ -147,15 +143,9 @@ func (i *NodeInfo) NameComponents() []string {
 	switch {
 	case i.Lineno != 0:
 		// User requested line numbers, provide what we have.
-		name = append(name, fmt.Sprintf("%s:%d", i.File, i.Lineno))
+		name = append(name, fmt.Sprintf(":%d", i.Lineno))
-	case i.File != "":
-		// User requested file name, provide it.
-		name = append(name, i.File)
 	case i.Name != "":
 		// User requested function name. It was already included.
-	case i.Objfile != "":
-		// Only binary name is available
-		name = append(name, "["+filepath.Base(i.Objfile)+"]")
 	default:
 		// Do not leave it empty if there is no information at all.
 		name = append(name, "<unknown>")
@@ -284,6 +274,7 @@ func newGraph(prof *profile.Profile, o *Options) (*Graph, map[uint64]Nodes) {
 					seenEdge[nodePair{n, parent}] = true
 					parent.AddToEdgeDiv(n, dw, w, residual, ni != len(locNodes)-1)
 				}
+
 				parent = n
 				residual = false
 			}
@@ -422,23 +413,14 @@ func (nm NodeMap) findOrInsertLine(l *profile.Location, li profile.Line, o *Opti
 
 func nodeInfo(l *profile.Location, line profile.Line, objfile string, o *Options) *NodeInfo {
 	if line.Function == nil {
-		return &NodeInfo{Address: l.Address, Objfile: objfile}
+		return &NodeInfo{Address: l.Address}
 	}
 	ni := &NodeInfo{
 		Address: l.Address,
 		Lineno:  int(line.Line),
 		Name:    line.Function.Name,
 	}
-	if fname := line.Function.Filename; fname != "" {
-		ni.File = filepath.Clean(fname)
-	}
-	if o.OrigFnNames {
-		ni.OrigName = line.Function.SystemName
-	}
-	if o.ObjNames || (ni.Name == "" && ni.OrigName == "") {
-		ni.Objfile = objfile
 	ni.StartLine = int(line.Function.StartLine)
-	}
 	return ni
 }
 
@@ -639,9 +621,6 @@ func (ns Nodes) Sort(o NodeOrder) error {
 	case FileOrder:
 		s = nodeSorter{ns,
 			func(l, r *Node) bool {
-				if iv, jv := l.Info.File, r.Info.File; iv != jv {
-					return iv < jv
-				}
 				if iv, jv := l.Info.StartLine, r.Info.StartLine; iv != jv {
 					return iv < jv
 				}