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Commit 650a1ef6 authored by Rob Pike's avatar Rob Pike
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cmd/cov: delete 

It doesn't work, it's not portable, it's not part of the released
binaries, and a better tool is due.

Fixes #1319.
Fixes #4621.

R=golang-dev, bradfitz, dave, rsc
CC=golang-dev
https://golang.org/cl/9681044
parent ee78a707
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src/cmd/cov/Makefile deleted 100644 → 0
View file @ ee78a707
# Copyright 2012 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.
include ../../Make.dist
src/cmd/cov/doc.go deleted 100644 → 0
View file @ ee78a707
// 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.
// +build ignore
/*
Cov is a rudimentary code coverage tool.
Usage:
go tool cov [-lsv] [-g substring] [-m minlines] [6.out args]
Given a command to run, it runs the command while tracking which
sections of code have been executed. When the command finishes,
cov prints the line numbers of sections of code in the binary that
were not executed. With no arguments it assumes the command "6.out".
The options are:
-l
print full path names instead of paths relative to the current directory
-s
show the source code that didn't execute, in addition to the line numbers.
-v
print debugging information during the run.
-g substring
restrict the coverage analysis to functions or files whose names contain substring
-m minlines
only report uncovered sections of code larger than minlines lines
The program is the same for all architectures: 386, amd64, and arm.
*/
package main
src/cmd/cov/main.c deleted 100644 → 0
View file @ ee78a707
// 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.
/*
* code coverage
*/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include "tree.h"
#include <ureg_amd64.h>
#include <mach.h>
typedef struct Ureg Ureg;
void
usage(void)
{
fprint(2, "usage: cov [-lsv] [-g substring] [-m minlines] [6.out args...]\n");
fprint(2, "-g specifies pattern of interesting functions or files\n");
exits("usage");
}
typedef struct Range Range;
struct Range
{
uvlong pc;
uvlong epc;
};
int chatty;
int fd;
int longnames;
int pid;
int doshowsrc;
Map *mem;
Map *text;
Fhdr fhdr;
char *substring;
char cwd[1000];
int ncwd;
int minlines = -1000;
Tree breakpoints; // code ranges not run
/*
* comparison for Range structures
* they are "equal" if they overlap, so
* that a search for [pc, pc+1) finds the
* Range containing pc.
*/
int
rangecmp(void *va, void *vb)
{
Range *a = va, *b = vb;
if(a->epc <= b->pc)
return 1;
if(b->epc <= a->pc)
return -1;
return 0;
}
/*
* remember that we ran the section of code [pc, epc).
*/
void
ran(uvlong pc, uvlong epc)
{
Range key;
Range *r;
uvlong oldepc;
if(chatty)
print("run %#llux-%#llux\n", pc, epc);
key.pc = pc;
key.epc = pc+1;
r = treeget(&breakpoints, &key);
if(r == nil)
sysfatal("unchecked breakpoint at %#llux+%d", pc, (int)(epc-pc));
// Might be that the tail of the sequence
// was run already, so r->epc is before the end.
// Adjust len.
if(epc > r->epc)
epc = r->epc;
if(r->pc == pc) {
r->pc = epc;
} else {
// Chop r to before pc;
// add new entry for after if needed.
// Changing r->epc does not affect r's position in the tree.
oldepc = r->epc;
r->epc = pc;
if(epc < oldepc) {
Range *n;
n = malloc(sizeof *n);
if(n == nil)
sysfatal("out of memory");
n->pc = epc;
n->epc = oldepc;
treeput(&breakpoints, n, n);
}
}
}
void
showsrc(char *file, int line1, int line2)
{
Biobuf *b;
char *p;
int n, stop;
if((b = Bopen(file, OREAD)) == nil) {
print("\topen %s: %r\n", file);
return;
}
for(n=1; n<line1 && (p = Brdstr(b, '\n', 1)) != nil; n++)
free(p);
// print up to five lines (this one and 4 more).
// if there are more than five lines, print 4 and "..."
stop = n+4;
if(stop > line2)
stop = line2;
if(stop < line2)
stop--;
for(; n<=stop && (p = Brdstr(b, '\n', 1)) != nil; n++) {
print(" %d %s\n", n, p);
free(p);
}
if(n < line2)
print(" ...\n");
Bterm(b);
}
/*
* if s is in the current directory or below,
* return the relative path.
*/
char*
shortname(char *s)
{
if(!longnames && strlen(s) > ncwd && memcmp(s, cwd, ncwd) == 0 && s[ncwd] == '/')
return s+ncwd+1;
return s;
}
/*
* we've decided that [pc, epc) did not run.
* do something about it.
*/
void
missing(uvlong pc, uvlong epc)
{
char file[1000];
int line1, line2;
char buf[100];
Symbol s;
char *p;
uvlong uv;
if(!findsym(pc, CTEXT, &s) || !fileline(file, sizeof file, pc)) {
notfound:
print("%#llux-%#llux\n", pc, epc);
return;
}
p = strrchr(file, ':');
*p++ = 0;
line1 = atoi(p);
for(uv=pc; uv<epc; ) {
if(!fileline(file, sizeof file, epc-2))
goto notfound;
uv += machdata->instsize(text, uv);
}
p = strrchr(file, ':');
*p++ = 0;
line2 = atoi(p);
if(line2+1-line2 < minlines)
return;
if(pc == s.value) {
// never entered function
print("%s:%d %s never called (%#llux-%#llux)\n", shortname(file), line1, s.name, pc, epc);
return;
}
if(pc <= s.value+13) {
// probably stub for stack growth.
// check whether last instruction is call to morestack.
// the -5 below is the length of
// CALL sys.morestack.
buf[0] = 0;
machdata->das(text, epc-5, 0, buf, sizeof buf);
if(strstr(buf, "morestack"))
return;
}
if(epc - pc == 5) {
// check for CALL sys.panicindex
buf[0] = 0;
machdata->das(text, pc, 0, buf, sizeof buf);
if(strstr(buf, "panicindex"))
return;
}
if(epc - pc == 2 || epc -pc == 3) {
// check for XORL inside shift.
// (on x86 have to implement large left or unsigned right shift with explicit zeroing).
// f+90 0x00002c9f CMPL CX,$20
// f+93 0x00002ca2 JCS f+97(SB)
// f+95 0x00002ca4 XORL AX,AX <<<
// f+97 0x00002ca6 SHLL CL,AX
// f+99 0x00002ca8 MOVL $1,CX
//
// f+c8 0x00002cd7 CMPL CX,$40
// f+cb 0x00002cda JCS f+d0(SB)
// f+cd 0x00002cdc XORQ AX,AX <<<
// f+d0 0x00002cdf SHLQ CL,AX
// f+d3 0x00002ce2 MOVQ $1,CX
buf[0] = 0;
machdata->das(text, pc, 0, buf, sizeof buf);
if(strncmp(buf, "XOR", 3) == 0) {
machdata->das(text, epc, 0, buf, sizeof buf);
if(strncmp(buf, "SHL", 3) == 0 || strncmp(buf, "SHR", 3) == 0)
return;
}
}
if(epc - pc == 3) {
// check for SAR inside shift.
// (on x86 have to implement large signed right shift as >>31).
// f+36 0x00016216 CMPL CX,$20
// f+39 0x00016219 JCS f+3e(SB)
// f+3b 0x0001621b SARL $1f,AX <<<
// f+3e 0x0001621e SARL CL,AX
// f+40 0x00016220 XORL CX,CX
// f+42 0x00016222 CMPL CX,AX
buf[0] = 0;
machdata->das(text, pc, 0, buf, sizeof buf);
if(strncmp(buf, "SAR", 3) == 0) {
machdata->das(text, epc, 0, buf, sizeof buf);
if(strncmp(buf, "SAR", 3) == 0)
return;
}
}
// show first instruction to make clear where we were.
machdata->das(text, pc, 0, buf, sizeof buf);
if(line1 != line2)
print("%s:%d,%d %#llux-%#llux %s\n",
shortname(file), line1, line2, pc, epc, buf);
else
print("%s:%d %#llux-%#llux %s\n",
shortname(file), line1, pc, epc, buf);
if(doshowsrc)
showsrc(file, line1, line2);
}
/*
* walk the tree, calling missing for each non-empty
* section of missing code.
*/
void
walktree(TreeNode *t)
{
Range *n;
if(t == nil)
return;
walktree(t->left);
n = t->key;
if(n->pc < n->epc)
missing(n->pc, n->epc);
walktree(t->right);
}
/*
* set a breakpoint all over [pc, epc)
* and remember that we did.
*/
void
breakpoint(uvlong pc, uvlong epc)
{
Range *r;
r = malloc(sizeof *r);
if(r == nil)
sysfatal("out of memory");
r->pc = pc;
r->epc = epc;
treeput(&breakpoints, r, r);
for(; pc < epc; pc+=machdata->bpsize)
put1(mem, pc, machdata->bpinst, machdata->bpsize);
}
/*
* install breakpoints over all text symbols
* that match the pattern.
*/
void
cover(void)
{
Symbol s;
char *lastfn;
uvlong lastpc;
int i;
char buf[200];
lastfn = nil;
lastpc = 0;
for(i=0; textsym(&s, i); i++) {
switch(s.type) {
case 'T':
case 't':
if(lastpc != 0) {
breakpoint(lastpc, s.value);
lastpc = 0;
}
// Ignore second entry for a given name;
// that's the debugging blob.
if(lastfn && strcmp(s.name, lastfn) == 0)
break;
lastfn = s.name;
buf[0] = 0;
fileline(buf, sizeof buf, s.value);
if(substring == nil || strstr(buf, substring) || strstr(s.name, substring))
lastpc = s.value;
}
}
}
uvlong
rgetzero(Map *map, char *reg)
{
USED(map);
USED(reg);
return 0;
}
/*
* remove the breakpoints at pc and successive instructions,
* up to and including the first jump or other control flow transfer.
*/
void
uncover(uvlong pc)
{
uchar buf[1000];
int n, n1, n2;
uvlong foll[2];
// Double-check that we stopped at a breakpoint.
if(get1(mem, pc, buf, machdata->bpsize) < 0)
sysfatal("read mem inst at %#llux: %r", pc);
if(memcmp(buf, machdata->bpinst, machdata->bpsize) != 0)
sysfatal("stopped at %#llux; not at breakpoint %d", pc, machdata->bpsize);
// Figure out how many bytes of straight-line code
// there are in the text starting at pc.
n = 0;
while(n < sizeof buf) {
n1 = machdata->instsize(text, pc+n);
if(n+n1 > sizeof buf)
break;
n2 = machdata->foll(text, pc+n, rgetzero, foll);
n += n1;
if(n2 != 1 || foll[0] != pc+n)
break;
}
// Record that this section of code ran.
ran(pc, pc+n);
// Put original instructions back.
if(get1(text, pc, buf, n) < 0)
sysfatal("get1: %r");
if(put1(mem, pc, buf, n) < 0)
sysfatal("put1: %r");
}
int
startprocess(char **argv)
{
int pid;
if((pid = fork()) < 0)
sysfatal("fork: %r");
if(pid == 0) {
pid = getpid();
if(ctlproc(pid, "hang") < 0)
sysfatal("ctlproc hang: %r");
exec(argv[0], argv);
sysfatal("exec %s: %r", argv[0]);
}
if(ctlproc(pid, "attached") < 0 || ctlproc(pid, "waitstop") < 0)
sysfatal("attach %d %s: %r", pid, argv[0]);
return pid;
}
int
go(void)
{
uvlong pc;
char buf[100];
int n;
for(n = 0;; n++) {
ctlproc(pid, "startstop");
if(get8(mem, offsetof(Ureg, ip), &pc) < 0) {
rerrstr(buf, sizeof buf);
if(strstr(buf, "exited") || strstr(buf, "No such process"))
return n;
sysfatal("cannot read pc: %r");
}
pc--;
if(put8(mem, offsetof(Ureg, ip), pc) < 0)
sysfatal("cannot write pc: %r");
uncover(pc);
}
}
void
main(int argc, char **argv)
{
int n;
ARGBEGIN{
case 'g':
substring = EARGF(usage());
break;
case 'l':
longnames++;
break;
case 'n':
minlines = atoi(EARGF(usage()));
break;
case 's':
doshowsrc = 1;
break;
case 'v':
chatty++;
break;
default:
usage();
}ARGEND
getwd(cwd, sizeof cwd);
ncwd = strlen(cwd);
if(argc == 0) {
*--argv = "6.out";
}
fd = open(argv[0], OREAD);
if(fd < 0)
sysfatal("open %s: %r", argv[0]);
if(crackhdr(fd, &fhdr) <= 0)
sysfatal("crackhdr: %r");
machbytype(fhdr.type);
if(syminit(fd, &fhdr) <= 0)
sysfatal("syminit: %r");
text = loadmap(nil, fd, &fhdr);
if(text == nil)
sysfatal("loadmap: %r");
pid = startprocess(argv);
mem = attachproc(pid, &fhdr);
if(mem == nil)
sysfatal("attachproc: %r");
breakpoints.cmp = rangecmp;
cover();
n = go();
walktree(breakpoints.root);
if(chatty)
print("%d breakpoints\n", n);
detachproc(mem);
exits(0);
}
src/cmd/cov/tree.c deleted 100644 → 0
View file @ ee78a707
// Renamed from Map to Tree to avoid conflict with libmach.
/*
Copyright (c) 2003-2007 Russ Cox, Tom Bergan, Austin Clements,
Massachusetts Institute of Technology
Portions Copyright (c) 2009 The Go Authors. All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
// Mutable map structure, but still based on
// Okasaki, Red Black Trees in a Functional Setting, JFP 1999,
// which is a lot easier than the traditional red-black
// and plenty fast enough for me. (Also I could copy
// and edit fmap.c.)
#include <u.h>
#include <libc.h>
#include "tree.h"
enum
{
Red = 0,
Black = 1
};
// Red-black trees are binary trees with this property:
// 1. No red node has a red parent.
// 2. Every path from the root to a leaf contains the
// same number of black nodes.
static TreeNode*
rwTreeNode(TreeNode *p, int color, TreeNode *left, void *key, void *value, TreeNode *right)
{
if(p == nil)
p = malloc(sizeof *p);
if(p == nil)
sysfatal("out of memory");
p->color = color;
p->left = left;
p->key = key;
p->value = value;
p->right = right;
return p;
}
static TreeNode*
balance(TreeNode *m0)
{
void *xk, *xv, *yk, *yv, *zk, *zv;
TreeNode *a, *b, *c, *d;
TreeNode *m1, *m2;
int color;
TreeNode *left, *right;
void *key, *value;
color = m0->color;
left = m0->left;
key = m0->key;
value = m0->value;
right = m0->right;
// Okasaki notation: (T is mkTreeNode, B is Black, R is Red, x, y, z are key-value.
//
// balance B (T R (T R a x b) y c) z d
// balance B (T R a x (T R b y c)) z d
// balance B a x (T R (T R b y c) z d)
// balance B a x (T R b y (T R c z d))
//
// = T R (T B a x b) y (T B c z d)
if(color == Black){
if(left && left->color == Red){
if(left->left && left->left->color == Red){
a = left->left->left;
xk = left->left->key;
xv = left->left->value;
b = left->left->right;
yk = left->key;
yv = left->value;
c = left->right;
zk = key;
zv = value;
d = right;
m1 = left;
m2 = left->left;
goto hard;
}else if(left->right && left->right->color == Red){
a = left->left;
xk = left->key;
xv = left->value;
b = left->right->left;
yk = left->right->key;
yv = left->right->value;
c = left->right->right;
zk = key;
zv = value;
d = right;
m1 = left;
m2 = left->right;
goto hard;
}
}else if(right && right->color == Red){
if(right->left && right->left->color == Red){
a = left;
xk = key;
xv = value;
b = right->left->left;
yk = right->left->key;
yv = right->left->value;
c = right->left->right;
zk = right->key;
zv = right->value;
d = right->right;
m1 = right;
m2 = right->left;
goto hard;
}else if(right->right && right->right->color == Red){
a = left;
xk = key;
xv = value;
b = right->left;
yk = right->key;
yv = right->value;
c = right->right->left;
zk = right->right->key;
zv = right->right->value;
d = right->right->right;
m1 = right;
m2 = right->right;
goto hard;
}
}
}
return rwTreeNode(m0, color, left, key, value, right);
hard:
return rwTreeNode(m0, Red, rwTreeNode(m1, Black, a, xk, xv, b),
yk, yv, rwTreeNode(m2, Black, c, zk, zv, d));
}
static TreeNode*
ins0(TreeNode *p, void *k, void *v, TreeNode *rw)
{
if(p == nil)
return rwTreeNode(rw, Red, nil, k, v, nil);
if(p->key == k){
if(rw)
return rwTreeNode(rw, p->color, p->left, k, v, p->right);
p->value = v;
return p;
}
if(p->key < k)
p->left = ins0(p->left, k, v, rw);
else
p->right = ins0(p->right, k, v, rw);
return balance(p);
}
static TreeNode*
ins1(Tree *m, TreeNode *p, void *k, void *v, TreeNode *rw)
{
int i;
if(p == nil)
return rwTreeNode(rw, Red, nil, k, v, nil);
i = m->cmp(p->key, k);
if(i == 0){
if(rw)
return rwTreeNode(rw, p->color, p->left, k, v, p->right);
p->value = v;
return p;
}
if(i < 0)
p->left = ins1(m, p->left, k, v, rw);
else
p->right = ins1(m, p->right, k, v, rw);
return balance(p);
}
void
treeputelem(Tree *m, void *key, void *val, TreeNode *rw)
{
if(m->cmp)
m->root = ins1(m, m->root, key, val, rw);
else
m->root = ins0(m->root, key, val, rw);
}
void
treeput(Tree *m, void *key, void *val)
{
treeputelem(m, key, val, nil);
}
void*
treeget(Tree *m, void *key)
{
int i;
TreeNode *p;
p = m->root;
if(m->cmp){
for(;;){
if(p == nil)
return nil;
i = m->cmp(p->key, key);
if(i < 0)
p = p->left;
else if(i > 0)
p = p->right;
else
return p->value;
}
}else{
for(;;){
if(p == nil)
return nil;
if(p->key == key)
return p->value;
if(p->key < key)
p = p->left;
else
p = p->right;
}
}
}
src/cmd/cov/tree.h deleted 100644 → 0
View file @ ee78a707
// Renamed from Map to Tree to avoid conflict with libmach.
/*
Copyright (c) 2003-2007 Russ Cox, Tom Bergan, Austin Clements,
Massachusetts Institute of Technology
Portions Copyright (c) 2009 The Go Authors. All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
typedef struct Tree Tree;
typedef struct TreeNode TreeNode;
struct Tree
{
int (*cmp)(void*, void*);
TreeNode *root;
};
struct TreeNode
{
int color;
TreeNode *left;
void *key;
void *value;
TreeNode *right;
};
void *treeget(Tree*, void*);
void treeput(Tree*, void*, void*);
void treeputelem(Tree*, void*, void*, TreeNode*);
src/cmd/dist/build.c
View file @ 650a1ef6
......@@ -318,7 +318,6 @@ static char *oldtool[] = {
// Unreleased directories (relative to $GOROOT) that should
// not be in release branches.
static char *unreleased[] = {
"src/cmd/cov",
"src/cmd/prof",
"src/pkg/old",
};
......@@ -602,8 +601,8 @@ install(char *dir)
goto out;
}
// For release, cmd/prof and cmd/cov are not included.
if((streq(dir, "cmd/cov") || streq(dir, "cmd/prof")) && !isdir(bstr(&path))) {
// For release, cmd/prof is not included.
if((streq(dir, "cmd/prof")) && !isdir(bstr(&path))) {
if(vflag > 1)
errprintf("skipping %s - does not exist\n", dir);
goto out;
......@@ -1198,7 +1197,6 @@ static char *buildorder[] = {
"misc/pprof",
"cmd/addr2line",
"cmd/cov",
"cmd/nm",
"cmd/objdump",
"cmd/pack",
......@@ -1276,7 +1274,6 @@ static char *cleantab[] = {
"cmd/8l",
"cmd/addr2line",
"cmd/cc",
"cmd/cov",
"cmd/gc",
"cmd/go",
"cmd/nm",
......@@ -1339,7 +1336,7 @@ clean(void)
vinit(&dir);
for(i=0; i<nelem(cleantab); i++) {
if((streq(cleantab[i], "cmd/cov") || streq(cleantab[i], "cmd/prof")) && !isdir(cleantab[i]))
if((streq(cleantab[i], "cmd/prof")) && !isdir(cleantab[i]))
continue;
bpathf(&path, "%s/src/%s", goroot, cleantab[i]);
xreaddir(&dir, bstr(&path));
......
src/sudo.bash
View file @ 650a1ef6
......@@ -19,7 +19,7 @@ if ! go help >/dev/null 2>&1; then
fi
eval $(go env)
if ! [ -x $GOTOOLDIR/cov -a -x $GOTOOLDIR/prof ]; then
if ! [ -x $GOTOOLDIR/prof ]; then
echo "You don't need to run sudo.bash." >&2
exit 2
fi
......@@ -30,7 +30,7 @@ if [[ ! -d /usr/local/bin ]]; then
fi
cd $(dirname $0)
for i in prof cov
for i in prof
do
# Remove old binaries if present
sudo rm -f /usr/local/bin/6$i
......
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