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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package binutils
import (
"fmt"
"regexp"
"testing"
"github.com/google/pprof/internal/plugin"
)
// TestFindSymbols tests the FindSymbols routine using a hardcoded nm output.
func TestFindSymbols(t *testing.T) {
type testcase struct {
query, syms string
want []plugin.Sym
}
testsyms := `0000000000001000 t lineA001
0000000000001000 t lineA002
0000000000001000 t line1000
0000000000002000 t line200A
0000000000002000 t line2000
0000000000002000 t line200B
0000000000003000 t line3000
0000000000003000 t _ZNK4DumbclEPKc
0000000000003000 t lineB00C
0000000000003000 t line300D
0000000000004000 t _the_end
`
testcases := []testcase{
{
"line.*[AC]",
testsyms,
[]plugin.Sym{
{Name: []string{"lineA001"}, File: "object.o", Start: 0x1000, End: 0x1FFF},
{Name: []string{"line200A"}, File: "object.o", Start: 0x2000, End: 0x2FFF},
{Name: []string{"lineB00C"}, File: "object.o", Start: 0x3000, End: 0x3FFF},
},
},
{
"Dumb::operator",
testsyms,
[]plugin.Sym{
{Name: []string{"Dumb::operator()(char const*) const"}, File: "object.o", Start: 0x3000, End: 0x3FFF},
},
},
}
for _, tc := range testcases {
syms, err := findSymbols([]byte(tc.syms), "object.o", regexp.MustCompile(tc.query), 0)
if err != nil {
t.Fatalf("%q: findSymbols: %v", tc.query, err)
}
if err := checkSymbol(syms, tc.want); err != nil {
t.Errorf("%q: %v", tc.query, err)
}
}
}
func checkSymbol(got []*plugin.Sym, want []plugin.Sym) error {
if len(got) != len(want) {
return fmt.Errorf("unexpected number of symbols %d (want %d)", len(got), len(want))
}
for i, g := range got {
w := want[i]
if len(g.Name) != len(w.Name) {
return fmt.Errorf("names, got %d, want %d", len(g.Name), len(w.Name))
}
for n := range g.Name {
if g.Name[n] != w.Name[n] {
return fmt.Errorf("name %d, got %q, want %q", n, g.Name[n], w.Name[n])
}
}
if g.File != w.File {
return fmt.Errorf("filename, got %q, want %q", g.File, w.File)
}
if g.Start != w.Start {
return fmt.Errorf("start address, got %#x, want %#x", g.Start, w.Start)
}
if g.End != w.End {
return fmt.Errorf("end address, got %#x, want %#x", g.End, w.End)
}
}
return nil
}
// TestFunctionAssembly tests the FunctionAssembly routine by using a
// fake objdump script.
func TestFunctionAssembly(t *testing.T) {
type testcase struct {
s plugin.Sym
asm string
want []plugin.Inst
}
testcases := []testcase{
{
plugin.Sym{Name: []string{"symbol1"}, Start: 0x1000, End: 0x1FFF},
" 1000: instruction one\n 1001: instruction two\n 1002: instruction three\n 1003: instruction four",
[]plugin.Inst{
{Addr: 0x1000, Text: "instruction one"},
{Addr: 0x1001, Text: "instruction two"},
{Addr: 0x1002, Text: "instruction three"},
{Addr: 0x1003, Text: "instruction four"},
},
},
{
plugin.Sym{Name: []string{"symbol2"}, Start: 0x2000, End: 0x2FFF},
" 2000: instruction one\n 2001: instruction two",
[]plugin.Inst{
{Addr: 0x2000, Text: "instruction one"},
{Addr: 0x2001, Text: "instruction two"},
},
},
{
plugin.Sym{Name: []string{"_main"}, Start: 0x30000, End: 0x3FFF},
"_main:\n; /tmp/hello.c:3\n30001: push %rbp",
[]plugin.Inst{
{Addr: 0x30001, Text: "push %rbp", Function: "_main", File: "/tmp/hello.c", Line: 3},
},
},
{
plugin.Sym{Name: []string{"main"}, Start: 0x4000, End: 0x4FFF},
"000000000040052d <main>:\nmain():\n/tmp/hello.c:3\n40001: push %rbp",
[]plugin.Inst{
{Addr: 0x40001, Text: "push %rbp", Function: "main", File: "/tmp/hello.c", Line: 3},
},
},
}
for _, tc := range testcases {
insts, err := disassemble([]byte(tc.asm))
if err != nil {
t.Fatalf("FunctionAssembly: %v", err)
}
if len(insts) != len(tc.want) {
t.Errorf("Unexpected number of assembly instructions %d (want %d)\n", len(insts), len(tc.want))
}
for i := range insts {
if insts[i] != tc.want[i] {
t.Errorf("Expected symbol %v, got %v\n", tc.want[i], insts[i])
}
}
}
}
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