// Copyright 2015 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 ssa
import (
"bytes"
"cmd/internal/src"
"fmt"
"html"
"io"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
)
type HTMLWriter struct {
Logger
w io.WriteCloser
path string
dot *dotWriter
}
func NewHTMLWriter(path string, logger Logger, funcname, cfgMask string) *HTMLWriter {
out, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
logger.Fatalf(src.NoXPos, "%v", err)
}
pwd, err := os.Getwd()
if err != nil {
logger.Fatalf(src.NoXPos, "%v", err)
}
html := HTMLWriter{w: out, Logger: logger, path: filepath.Join(pwd, path)}
html.dot = newDotWriter(cfgMask)
html.start(funcname)
return &html
}
func (w *HTMLWriter) start(name string) {
if w == nil {
return
}
w.WriteString("<html>")
w.WriteString(`<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<style>
body {
font-size: 14px;
font-family: Arial, sans-serif;
}
h1 {
font-size: 18px;
display: inline-block;
margin: 0 1em .5em 0;
}
#helplink {
display: inline-block;
}
#help {
display: none;
}
.stats {
font-size: 60%;
}
table {
border: 1px solid black;
table-layout: fixed;
width: 300px;
}
th, td {
border: 1px solid black;
overflow: hidden;
width: 400px;
vertical-align: top;
padding: 5px;
}
td > h2 {
cursor: pointer;
font-size: 120%;
}
td.collapsed {
font-size: 12px;
width: 12px;
border: 0px;
padding: 0;
cursor: pointer;
background: #fafafa;
}
td.collapsed div {
-moz-transform: rotate(-90.0deg); /* FF3.5+ */
-o-transform: rotate(-90.0deg); /* Opera 10.5 */
-webkit-transform: rotate(-90.0deg); /* Saf3.1+, Chrome */
filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=0.083); /* IE6,IE7 */
-ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(rotation=0.083)"; /* IE8 */
margin-top: 10.3em;
margin-left: -10em;
margin-right: -10em;
text-align: right;
}
code, pre, .lines, .ast {
font-family: Menlo, monospace;
font-size: 12px;
}
pre {
-moz-tab-size: 4;
-o-tab-size: 4;
tab-size: 4;
}
.allow-x-scroll {
overflow-x: scroll;
}
.lines {
float: left;
overflow: hidden;
text-align: right;
}
.lines div {
padding-right: 10px;
color: gray;
}
div.line-number {
font-size: 12px;
}
.ast {
white-space: nowrap;
}
td.ssa-prog {
width: 600px;
word-wrap: break-word;
}
li {
list-style-type: none;
}
li.ssa-long-value {
text-indent: -2em; /* indent wrapped lines */
}
li.ssa-value-list {
display: inline;
}
li.ssa-start-block {
padding: 0;
margin: 0;
}
li.ssa-end-block {
padding: 0;
margin: 0;
}
ul.ssa-print-func {
padding-left: 0;
}
li.ssa-start-block button {
padding: 0 1em;
margin: 0;
border: none;
display: inline;
font-size: 14px;
float: right;
}
button:hover {
background-color: #eee;
cursor: pointer;
}
dl.ssa-gen {
padding-left: 0;
}
dt.ssa-prog-src {
padding: 0;
margin: 0;
float: left;
width: 4em;
}
dd.ssa-prog {
padding: 0;
margin-right: 0;
margin-left: 4em;
}
.dead-value {
color: gray;
}
.dead-block {
opacity: 0.5;
}
.depcycle {
font-style: italic;
}
.line-number {
font-size: 11px;
}
.no-line-number {
font-size: 11px;
color: gray;
}
.zoom {
position: absolute;
float: left;
white-space: nowrap;
background-color: #eee;
}
.zoom a:link, .zoom a:visited {
text-decoration: none;
color: blue;
font-size: 16px;
padding: 4px 2px;
}
svg {
cursor: default;
outline: 1px solid #eee;
}
.highlight-aquamarine { background-color: aquamarine; }
.highlight-coral { background-color: coral; }
.highlight-lightpink { background-color: lightpink; }
.highlight-lightsteelblue { background-color: lightsteelblue; }
.highlight-palegreen { background-color: palegreen; }
.highlight-skyblue { background-color: skyblue; }
.highlight-lightgray { background-color: lightgray; }
.highlight-yellow { background-color: yellow; }
.highlight-lime { background-color: lime; }
.highlight-khaki { background-color: khaki; }
.highlight-aqua { background-color: aqua; }
.highlight-salmon { background-color: salmon; }
.outline-blue { outline: blue solid 2px; }
.outline-red { outline: red solid 2px; }
.outline-blueviolet { outline: blueviolet solid 2px; }
.outline-darkolivegreen { outline: darkolivegreen solid 2px; }
.outline-fuchsia { outline: fuchsia solid 2px; }
.outline-sienna { outline: sienna solid 2px; }
.outline-gold { outline: gold solid 2px; }
.outline-orangered { outline: orangered solid 2px; }
.outline-teal { outline: teal solid 2px; }
.outline-maroon { outline: maroon solid 2px; }
.outline-black { outline: black solid 2px; }
ellipse.outline-blue { stroke-width: 2px; stroke: blue; }
ellipse.outline-red { stroke-width: 2px; stroke: red; }
ellipse.outline-blueviolet { stroke-width: 2px; stroke: blueviolet; }
ellipse.outline-darkolivegreen { stroke-width: 2px; stroke: darkolivegreen; }
ellipse.outline-fuchsia { stroke-width: 2px; stroke: fuchsia; }
ellipse.outline-sienna { stroke-width: 2px; stroke: sienna; }
ellipse.outline-gold { stroke-width: 2px; stroke: gold; }
ellipse.outline-orangered { stroke-width: 2px; stroke: orangered; }
ellipse.outline-teal { stroke-width: 2px; stroke: teal; }
ellipse.outline-maroon { stroke-width: 2px; stroke: maroon; }
ellipse.outline-black { stroke-width: 2px; stroke: black; }
</style>
<script type="text/javascript">
// ordered list of all available highlight colors
var highlights = [
"highlight-aquamarine",
"highlight-coral",
"highlight-lightpink",
"highlight-lightsteelblue",
"highlight-palegreen",
"highlight-skyblue",
"highlight-lightgray",
"highlight-yellow",
"highlight-lime",
"highlight-khaki",
"highlight-aqua",
"highlight-salmon"
];
// state: which value is highlighted this color?
var highlighted = {};
for (var i = 0; i < highlights.length; i++) {
highlighted[highlights[i]] = "";
}
// ordered list of all available outline colors
var outlines = [
"outline-blue",
"outline-red",
"outline-blueviolet",
"outline-darkolivegreen",
"outline-fuchsia",
"outline-sienna",
"outline-gold",
"outline-orangered",
"outline-teal",
"outline-maroon",
"outline-black"
];
// state: which value is outlined this color?
var outlined = {};
for (var i = 0; i < outlines.length; i++) {
outlined[outlines[i]] = "";
}
window.onload = function() {
var ssaElemClicked = function(elem, event, selections, selected) {
event.stopPropagation();
// TODO: pushState with updated state and read it on page load,
// so that state can survive across reloads
// find all values with the same name
var c = elem.classList.item(0);
var x = document.getElementsByClassName(c);
// if selected, remove selections from all of them
// otherwise, attempt to add
var remove = "";
for (var i = 0; i < selections.length; i++) {
var color = selections[i];
if (selected[color] == c) {
remove = color;
break;
}
}
if (remove != "") {
for (var i = 0; i < x.length; i++) {
x[i].classList.remove(remove);
}
selected[remove] = "";
return;
}
// we're adding a selection
// find first available color
var avail = "";
for (var i = 0; i < selections.length; i++) {
var color = selections[i];
if (selected[color] == "") {
avail = color;
break;
}
}
if (avail == "") {
alert("out of selection colors; go add more");
return;
}
// set that as the selection
for (var i = 0; i < x.length; i++) {
x[i].classList.add(avail);
}
selected[avail] = c;
};
var ssaValueClicked = function(event) {
ssaElemClicked(this, event, highlights, highlighted);
};
var ssaBlockClicked = function(event) {
ssaElemClicked(this, event, outlines, outlined);
};
var ssavalues = document.getElementsByClassName("ssa-value");
for (var i = 0; i < ssavalues.length; i++) {
ssavalues[i].addEventListener('click', ssaValueClicked);
}
var ssalongvalues = document.getElementsByClassName("ssa-long-value");
for (var i = 0; i < ssalongvalues.length; i++) {
// don't attach listeners to li nodes, just the spans they contain
if (ssalongvalues[i].nodeName == "SPAN") {
ssalongvalues[i].addEventListener('click', ssaValueClicked);
}
}
var ssablocks = document.getElementsByClassName("ssa-block");
for (var i = 0; i < ssablocks.length; i++) {
ssablocks[i].addEventListener('click', ssaBlockClicked);
}
var lines = document.getElementsByClassName("line-number");
for (var i = 0; i < lines.length; i++) {
lines[i].addEventListener('click', ssaValueClicked);
}
// Contains phase names which are expanded by default. Other columns are collapsed.
var expandedDefault = [
"start",
"deadcode",
"opt",
"lower",
"late deadcode",
"regalloc",
"genssa",
];
function toggler(phase) {
return function() {
toggle_cell(phase+'-col');
toggle_cell(phase+'-exp');
};
}
function toggle_cell(id) {
var e = document.getElementById(id);
if (e.style.display == 'table-cell') {
e.style.display = 'none';
} else {
e.style.display = 'table-cell';
}
}
// Go through all columns and collapse needed phases.
var td = document.getElementsByTagName("td");
for (var i = 0; i < td.length; i++) {
var id = td[i].id;
var phase = id.substr(0, id.length-4);
var show = expandedDefault.indexOf(phase) !== -1
if (id.endsWith("-exp")) {
var h2 = td[i].getElementsByTagName("h2");
if (h2 && h2[0]) {
h2[0].addEventListener('click', toggler(phase));
}
} else {
td[i].addEventListener('click', toggler(phase));
}
if (id.endsWith("-col") && show || id.endsWith("-exp") && !show) {
td[i].style.display = 'none';
continue;
}
td[i].style.display = 'table-cell';
}
// find all svg block nodes, add their block classes
var nodes = document.querySelectorAll('*[id^="graph_node_"]');
for (var i = 0; i < nodes.length; i++) {
var node = nodes[i];
var name = node.id.toString();
var block = name.substring(name.lastIndexOf("_")+1);
node.classList.remove("node");
node.classList.add(block);
node.addEventListener('click', ssaBlockClicked);
var ellipse = node.getElementsByTagName('ellipse')[0];
ellipse.classList.add(block);
ellipse.addEventListener('click', ssaBlockClicked);
}
// make big graphs smaller
var targetScale = 0.5;
var nodes = document.querySelectorAll('*[id^="svg_graph_"]');
// TODO: Implement smarter auto-zoom using the viewBox attribute
// and in case of big graphs set the width and height of the svg graph to
// maximum allowed.
for (var i = 0; i < nodes.length; i++) {
var node = nodes[i];
var name = node.id.toString();
var phase = name.substring(name.lastIndexOf("_")+1);
var gNode = document.getElementById("g_graph_"+phase);
var scale = gNode.transform.baseVal.getItem(0).matrix.a;
if (scale > targetScale) {
node.width.baseVal.value *= targetScale / scale;
node.height.baseVal.value *= targetScale / scale;
}
}
};
function toggle_visibility(id) {
var e = document.getElementById(id);
if (e.style.display == 'block') {
e.style.display = 'none';
} else {
e.style.display = 'block';
}
}
function hideBlock(el) {
var es = el.parentNode.parentNode.getElementsByClassName("ssa-value-list");
if (es.length===0)
return;
var e = es[0];
if (e.style.display === 'block' || e.style.display === '') {
e.style.display = 'none';
el.innerHTML = '+';
} else {
e.style.display = 'block';
el.innerHTML = '-';
}
}
// TODO: scale the graph with the viewBox attribute.
function graphReduce(id) {
var node = document.getElementById(id);
if (node) {
node.width.baseVal.value *= 0.9;
node.height.baseVal.value *= 0.9;
}
return false;
}
function graphEnlarge(id) {
var node = document.getElementById(id);
if (node) {
node.width.baseVal.value *= 1.1;
node.height.baseVal.value *= 1.1;
}
return false;
}
function makeDraggable(event) {
var svg = event.target;
if (window.PointerEvent) {
svg.addEventListener('pointerdown', startDrag);
svg.addEventListener('pointermove', drag);
svg.addEventListener('pointerup', endDrag);
svg.addEventListener('pointerleave', endDrag);
} else {
svg.addEventListener('mousedown', startDrag);
svg.addEventListener('mousemove', drag);
svg.addEventListener('mouseup', endDrag);
svg.addEventListener('mouseleave', endDrag);
}
var point = svg.createSVGPoint();
var isPointerDown = false;
var pointerOrigin;
var viewBox = svg.viewBox.baseVal;
function getPointFromEvent (event) {
point.x = event.clientX;
point.y = event.clientY;
// We get the current transformation matrix of the SVG and we inverse it
var invertedSVGMatrix = svg.getScreenCTM().inverse();
return point.matrixTransform(invertedSVGMatrix);
}
function startDrag(event) {
isPointerDown = true;
pointerOrigin = getPointFromEvent(event);
}
function drag(event) {
if (!isPointerDown) {
return;
}
event.preventDefault();
var pointerPosition = getPointFromEvent(event);
viewBox.x -= (pointerPosition.x - pointerOrigin.x);
viewBox.y -= (pointerPosition.y - pointerOrigin.y);
}
function endDrag(event) {
isPointerDown = false;
}
}</script>
</head>`)
w.WriteString("<body>")
w.WriteString("<h1>")
w.WriteString(html.EscapeString(name))
w.WriteString("</h1>")
w.WriteString(`
<a href="#" onclick="toggle_visibility('help');return false;" id="helplink">help</a>
<div id="help">
<p>
Click on a value or block to toggle highlighting of that value/block
and its uses. (Values and blocks are highlighted by ID, and IDs of
dead items may be reused, so not all highlights necessarily correspond
to the clicked item.)
</p>
<p>
Faded out values and blocks are dead code that has not been eliminated.
</p>
<p>
Values printed in italics have a dependency cycle.
</p>
<p>
<b>CFG</b>: Dashed edge is for unlikely branches. Blue color is for backward edges.
Edge with a dot means that this edge follows the order in which blocks were laidout.
</p>
</div>
`)
w.WriteString("<table>")
w.WriteString("<tr>")
}
func (w *HTMLWriter) Close() {
if w == nil {
return
}
io.WriteString(w.w, "</tr>")
io.WriteString(w.w, "</table>")
io.WriteString(w.w, "</body>")
io.WriteString(w.w, "</html>")
w.w.Close()
fmt.Printf("dumped SSA to %v\n", w.path)
}
// WriteFunc writes f in a column headed by title.
// phase is used for collapsing columns and should be unique across the table.
func (w *HTMLWriter) WriteFunc(phase, title string, f *Func) {
if w == nil {
return // avoid generating HTML just to discard it
}
//w.WriteColumn(phase, title, "", f.HTML())
w.WriteColumn(phase, title, "", f.HTML(phase, w.dot))
}
// FuncLines contains source code for a function to be displayed
// in sources column.
type FuncLines struct {
Filename string
StartLineno uint
Lines []string
}
// ByTopo sorts topologically: target function is on top,
// followed by inlined functions sorted by filename and line numbers.
type ByTopo []*FuncLines
func (x ByTopo) Len() int { return len(x) }
func (x ByTopo) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
func (x ByTopo) Less(i, j int) bool {
a := x[i]
b := x[j]
if a.Filename == b.Filename {
return a.StartLineno < b.StartLineno
}
return a.Filename < b.Filename
}
// WriteSources writes lines as source code in a column headed by title.
// phase is used for collapsing columns and should be unique across the table.
func (w *HTMLWriter) WriteSources(phase string, all []*FuncLines) {
if w == nil {
return // avoid generating HTML just to discard it
}
var buf bytes.Buffer
fmt.Fprint(&buf, "<div class=\"lines\" style=\"width: 8%\">")
filename := ""
for _, fl := range all {
fmt.Fprint(&buf, "<div> </div>")
if filename != fl.Filename {
fmt.Fprint(&buf, "<div> </div>")
filename = fl.Filename
}
for i := range fl.Lines {
ln := int(fl.StartLineno) + i
fmt.Fprintf(&buf, "<div class=\"l%v line-number\">%v</div>", ln, ln)
}
}
fmt.Fprint(&buf, "</div><div style=\"width: 92%\"><pre>")
filename = ""
for _, fl := range all {
fmt.Fprint(&buf, "<div> </div>")
if filename != fl.Filename {
fmt.Fprintf(&buf, "<div><strong>%v</strong></div>", fl.Filename)
filename = fl.Filename
}
for i, line := range fl.Lines {
ln := int(fl.StartLineno) + i
var escaped string
if strings.TrimSpace(line) == "" {
escaped = " "
} else {
escaped = html.EscapeString(line)
}
fmt.Fprintf(&buf, "<div class=\"l%v line-number\">%v</div>", ln, escaped)
}
}
fmt.Fprint(&buf, "</pre></div>")
w.WriteColumn(phase, phase, "allow-x-scroll", buf.String())
}
func (w *HTMLWriter) WriteAST(phase string, buf *bytes.Buffer) {
if w == nil {
return // avoid generating HTML just to discard it
}
lines := strings.Split(buf.String(), "\n")
var out bytes.Buffer
fmt.Fprint(&out, "<div>")
for _, l := range lines {
l = strings.TrimSpace(l)
var escaped string
var lineNo string
if l == "" {
escaped = " "
} else {
if strings.HasPrefix(l, "buildssa") {
escaped = fmt.Sprintf("<b>%v</b>", l)
} else {
// Parse the line number from the format l(123).
idx := strings.Index(l, " l(")
if idx != -1 {
subl := l[idx+3:]
idxEnd := strings.Index(subl, ")")
if idxEnd != -1 {
if _, err := strconv.Atoi(subl[:idxEnd]); err == nil {
lineNo = subl[:idxEnd]
}
}
}
escaped = html.EscapeString(l)
}
}
if lineNo != "" {
fmt.Fprintf(&out, "<div class=\"l%v line-number ast\">%v</div>", lineNo, escaped)
} else {
fmt.Fprintf(&out, "<div class=\"ast\">%v</div>", escaped)
}
}
fmt.Fprint(&out, "</div>")
w.WriteColumn(phase, phase, "allow-x-scroll", out.String())
}
// WriteColumn writes raw HTML in a column headed by title.
// It is intended for pre- and post-compilation log output.
func (w *HTMLWriter) WriteColumn(phase, title, class, html string) {
if w == nil {
return
}
id := strings.Replace(phase, " ", "-", -1)
// collapsed column
w.Printf("<td id=\"%v-col\" class=\"collapsed\"><div>%v</div></td>", id, phase)
if class == "" {
w.Printf("<td id=\"%v-exp\">", id)
} else {
w.Printf("<td id=\"%v-exp\" class=\"%v\">", id, class)
}
w.WriteString("<h2>" + title + "</h2>")
w.WriteString(html)
w.WriteString("</td>")
}
func (w *HTMLWriter) Printf(msg string, v ...interface{}) {
if _, err := fmt.Fprintf(w.w, msg, v...); err != nil {
w.Fatalf(src.NoXPos, "%v", err)
}
}
func (w *HTMLWriter) WriteString(s string) {
if _, err := io.WriteString(w.w, s); err != nil {
w.Fatalf(src.NoXPos, "%v", err)
}
}
func (v *Value) HTML() string {
// TODO: Using the value ID as the class ignores the fact
// that value IDs get recycled and that some values
// are transmuted into other values.
s := v.String()
return fmt.Sprintf("<span class=\"%s ssa-value\">%s</span>", s, s)
}
func (v *Value) LongHTML() string {
// TODO: Any intra-value formatting?
// I'm wary of adding too much visual noise,
// but a little bit might be valuable.
// We already have visual noise in the form of punctuation
// maybe we could replace some of that with formatting.
s := fmt.Sprintf("<span class=\"%s ssa-long-value\">", v.String())
linenumber := "<span class=\"no-line-number\">(?)</span>"
if v.Pos.IsKnown() {
linenumber = fmt.Sprintf("<span class=\"l%v line-number\">(%s)</span>", v.Pos.LineNumber(), v.Pos.LineNumberHTML())
}
s += fmt.Sprintf("%s %s = %s", v.HTML(), linenumber, v.Op.String())
s += " <" + html.EscapeString(v.Type.String()) + ">"
s += html.EscapeString(v.auxString())
for _, a := range v.Args {
s += fmt.Sprintf(" %s", a.HTML())
}
r := v.Block.Func.RegAlloc
if int(v.ID) < len(r) && r[v.ID] != nil {
s += " : " + html.EscapeString(r[v.ID].String())
}
var names []string
for name, values := range v.Block.Func.NamedValues {
for _, value := range values {
if value == v {
names = append(names, name.String())
break // drop duplicates.
}
}
}
if len(names) != 0 {
s += " (" + strings.Join(names, ", ") + ")"
}
s += "</span>"
return s
}
func (b *Block) HTML() string {
// TODO: Using the value ID as the class ignores the fact
// that value IDs get recycled and that some values
// are transmuted into other values.
s := html.EscapeString(b.String())
return fmt.Sprintf("<span class=\"%s ssa-block\">%s</span>", s, s)
}
func (b *Block) LongHTML() string {
// TODO: improve this for HTML?
s := fmt.Sprintf("<span class=\"%s ssa-block\">%s</span>", html.EscapeString(b.String()), html.EscapeString(b.Kind.String()))
if b.Aux != nil {
s += html.EscapeString(fmt.Sprintf(" {%v}", b.Aux))
}
if b.Control != nil {
s += fmt.Sprintf(" %s", b.Control.HTML())
}
if len(b.Succs) > 0 {
s += " →" // right arrow
for _, e := range b.Succs {
c := e.b
s += " " + c.HTML()
}
}
switch b.Likely {
case BranchUnlikely:
s += " (unlikely)"
case BranchLikely:
s += " (likely)"
}
if b.Pos.IsKnown() {
// TODO does not begin to deal with the full complexity of line numbers.
// Maybe we want a string/slice instead, of outer-inner when inlining.
s += fmt.Sprintf(" <span class=\"l%v line-number\">(%s)</span>", b.Pos.LineNumber(), b.Pos.LineNumberHTML())
}
return s
}
func (f *Func) HTML(phase string, dot *dotWriter) string {
buf := new(bytes.Buffer)
if dot != nil {
dot.writeFuncSVG(buf, phase, f)
}
fmt.Fprint(buf, "<code>")
p := htmlFuncPrinter{w: buf}
fprintFunc(p, f)
// fprintFunc(&buf, f) // TODO: HTML, not text, <br /> for line breaks, etc.
fmt.Fprint(buf, "</code>")
return buf.String()
}
func (d *dotWriter) writeFuncSVG(w io.Writer, phase string, f *Func) {
if d.broken {
return
}
if _, ok := d.phases[phase]; !ok {
return
}
cmd := exec.Command(d.path, "-Tsvg")
pipe, err := cmd.StdinPipe()
if err != nil {
d.broken = true
fmt.Println(err)
return
}
buf := new(bytes.Buffer)
cmd.Stdout = buf
bufErr := new(bytes.Buffer)
cmd.Stderr = bufErr
err = cmd.Start()
if err != nil {
d.broken = true
fmt.Println(err)
return
}
fmt.Fprint(pipe, `digraph "" { margin=0; size="4,40"; ranksep=.2; `)
id := strings.Replace(phase, " ", "-", -1)
fmt.Fprintf(pipe, `id="g_graph_%s";`, id)
fmt.Fprintf(pipe, `node [style=filled,fillcolor=white,fontsize=16,fontname="Menlo,Times,serif",margin="0.01,0.03"];`)
fmt.Fprintf(pipe, `edge [fontsize=16,fontname="Menlo,Times,serif"];`)
for i, b := range f.Blocks {
if b.Kind == BlockInvalid {
continue
}
layout := ""
if f.laidout {
layout = fmt.Sprintf(" #%d", i)
}
fmt.Fprintf(pipe, `%v [label="%v%s\n%v",id="graph_node_%v_%v",tooltip="%v"];`, b, b, layout, b.Kind.String(), id, b, b.LongString())
}
indexOf := make([]int, f.NumBlocks())
for i, b := range f.Blocks {
indexOf[b.ID] = i
}
layoutDrawn := make([]bool, f.NumBlocks())
ponums := make([]int32, f.NumBlocks())
_ = postorderWithNumbering(f, ponums)
isBackEdge := func(from, to ID) bool {
return ponums[from] <= ponums[to]
}
for _, b := range f.Blocks {
for i, s := range b.Succs {
style := "solid"
color := "black"
arrow := "vee"
if b.unlikelyIndex() == i {
style = "dashed"
}
if f.laidout && indexOf[s.b.ID] == indexOf[b.ID]+1 {
// Red color means ordered edge. It overrides other colors.
arrow = "dotvee"
layoutDrawn[s.b.ID] = true
} else if isBackEdge(b.ID, s.b.ID) {
color = "blue"
}
fmt.Fprintf(pipe, `%v -> %v [label=" %d ",style="%s",color="%s",arrowhead="%s"];`, b, s.b, i, style, color, arrow)
}
}
if f.laidout {
fmt.Fprintln(pipe, `edge[constraint=false,color=gray,style=solid,arrowhead=dot];`)
colors := [...]string{"#eea24f", "#f38385", "#f4d164", "#ca89fc", "gray"}
ci := 0
for i := 1; i < len(f.Blocks); i++ {
if layoutDrawn[f.Blocks[i].ID] {
continue
}
fmt.Fprintf(pipe, `%s -> %s [color="%s"];`, f.Blocks[i-1], f.Blocks[i], colors[ci])
ci = (ci + 1) % len(colors)
}
}
fmt.Fprint(pipe, "}")
pipe.Close()
err = cmd.Wait()
if err != nil {
d.broken = true
fmt.Printf("dot: %v\n%v\n", err, bufErr.String())
return
}
svgID := "svg_graph_" + id
fmt.Fprintf(w, `<div class="zoom"><button onclick="return graphReduce('%s');">-</button> <button onclick="return graphEnlarge('%s');">+</button></div>`, svgID, svgID)
// For now, an awful hack: edit the html as it passes through
// our fingers, finding '<svg ' and injecting needed attributes after it.
err = d.copyUntil(w, buf, `<svg `)
if err != nil {
fmt.Printf("injecting attributes: %v\n", err)
return
}
fmt.Fprintf(w, ` id="%s" onload="makeDraggable(evt)" `, svgID)
io.Copy(w, buf)
}
func (b *Block) unlikelyIndex() int {
switch b.Likely {
case BranchLikely:
return 1
case BranchUnlikely:
return 0
}
return -1
}
func (d *dotWriter) copyUntil(w io.Writer, buf *bytes.Buffer, sep string) error {
i := bytes.Index(buf.Bytes(), []byte(sep))
if i == -1 {
return fmt.Errorf("couldn't find dot sep %q", sep)
}
_, err := io.CopyN(w, buf, int64(i+len(sep)))
return err
}
type htmlFuncPrinter struct {
w io.Writer
}
func (p htmlFuncPrinter) header(f *Func) {}
func (p htmlFuncPrinter) startBlock(b *Block, reachable bool) {
var dead string
if !reachable {
dead = "dead-block"
}
fmt.Fprintf(p.w, "<ul class=\"%s ssa-print-func %s\">", b, dead)
fmt.Fprintf(p.w, "<li class=\"ssa-start-block\">%s:", b.HTML())
if len(b.Preds) > 0 {
io.WriteString(p.w, " ←") // left arrow
for _, e := range b.Preds {
pred := e.b
fmt.Fprintf(p.w, " %s", pred.HTML())
}
}
if len(b.Values) > 0 {
io.WriteString(p.w, `<button onclick="hideBlock(this)">-</button>`)
}
io.WriteString(p.w, "</li>")
if len(b.Values) > 0 { // start list of values
io.WriteString(p.w, "<li class=\"ssa-value-list\">")
io.WriteString(p.w, "<ul>")
}
}
func (p htmlFuncPrinter) endBlock(b *Block) {
if len(b.Values) > 0 { // end list of values
io.WriteString(p.w, "</ul>")
io.WriteString(p.w, "</li>")
}
io.WriteString(p.w, "<li class=\"ssa-end-block\">")
fmt.Fprint(p.w, b.LongHTML())
io.WriteString(p.w, "</li>")
io.WriteString(p.w, "</ul>")
}
func (p htmlFuncPrinter) value(v *Value, live bool) {
var dead string
if !live {
dead = "dead-value"
}
fmt.Fprintf(p.w, "<li class=\"ssa-long-value %s\">", dead)
fmt.Fprint(p.w, v.LongHTML())
io.WriteString(p.w, "</li>")
}
func (p htmlFuncPrinter) startDepCycle() {
fmt.Fprintln(p.w, "<span class=\"depcycle\">")
}
func (p htmlFuncPrinter) endDepCycle() {
fmt.Fprintln(p.w, "</span>")
}
func (p htmlFuncPrinter) named(n LocalSlot, vals []*Value) {
fmt.Fprintf(p.w, "<li>name %s: ", n)
for _, val := range vals {
fmt.Fprintf(p.w, "%s ", val.HTML())
}
fmt.Fprintf(p.w, "</li>")
}
type dotWriter struct {
path string
broken bool
phases map[string]bool // keys specify phases with CFGs
}
// newDotWriter returns non-nil value when mask is valid.
// dotWriter will generate SVGs only for the phases specified in the mask.
// mask can contain following patterns and combinations of them:
// * - all of them;
// x-y - x through y, inclusive;
// x,y - x and y, but not the passes between.
func newDotWriter(mask string) *dotWriter {
if mask == "" {
return nil
}
// User can specify phase name with _ instead of spaces.
mask = strings.Replace(mask, "_", " ", -1)
ph := make(map[string]bool)
ranges := strings.Split(mask, ",")
for _, r := range ranges {
spl := strings.Split(r, "-")
if len(spl) > 2 {
fmt.Printf("range is not valid: %v\n", mask)
return nil
}
var first, last int
if mask == "*" {
first = 0
last = len(passes) - 1
} else {
first = passIdxByName(spl[0])
last = passIdxByName(spl[len(spl)-1])
}
if first < 0 || last < 0 || first > last {
fmt.Printf("range is not valid: %v\n", r)
return nil
}
for p := first; p <= last; p++ {
ph[passes[p].name] = true
}
}
path, err := exec.LookPath("dot")
if err != nil {
fmt.Println(err)
return nil
}
return &dotWriter{path: path, phases: ph}
}
func passIdxByName(name string) int {
for i, p := range passes {
if p.name == name {
return i
}
}
return -1
}
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