Current File : //usr/local/go119/src/runtime/traceback_test.go
// Copyright 2021 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 runtime_test
import (
"bytes"
"internal/abi"
"internal/testenv"
"runtime"
"strings"
"testing"
)
var testTracebackArgsBuf [1000]byte
func TestTracebackArgs(t *testing.T) {
if *flagQuick {
t.Skip("-quick")
}
optimized := !strings.HasSuffix(testenv.Builder(), "-noopt")
abiSel := func(x, y string) string {
// select expected output based on ABI
// In noopt build we always spill arguments so the output is the same as stack ABI.
if optimized && abi.IntArgRegs > 0 {
return x
}
return y
}
tests := []struct {
fn func() int
expect string
}{
// simple ints
{
func() int { return testTracebackArgs1(1, 2, 3, 4, 5) },
"testTracebackArgs1(0x1, 0x2, 0x3, 0x4, 0x5)",
},
// some aggregates
{
func() int {
return testTracebackArgs2(false, struct {
a, b, c int
x [2]int
}{1, 2, 3, [2]int{4, 5}}, [0]int{}, [3]byte{6, 7, 8})
},
"testTracebackArgs2(0x0, {0x1, 0x2, 0x3, {0x4, 0x5}}, {}, {0x6, 0x7, 0x8})",
},
{
func() int { return testTracebackArgs3([3]byte{1, 2, 3}, 4, 5, 6, [3]byte{7, 8, 9}) },
"testTracebackArgs3({0x1, 0x2, 0x3}, 0x4, 0x5, 0x6, {0x7, 0x8, 0x9})",
},
// too deeply nested type
{
func() int { return testTracebackArgs4(false, [1][1][1][1][1][1][1][1][1][1]int{}) },
"testTracebackArgs4(0x0, {{{{{...}}}}})",
},
// a lot of zero-sized type
{
func() int {
z := [0]int{}
return testTracebackArgs5(false, struct {
x int
y [0]int
z [2][0]int
}{1, z, [2][0]int{}}, z, z, z, z, z, z, z, z, z, z, z, z)
},
"testTracebackArgs5(0x0, {0x1, {}, {{}, {}}}, {}, {}, {}, {}, {}, ...)",
},
// edge cases for ...
// no ... for 10 args
{
func() int { return testTracebackArgs6a(1, 2, 3, 4, 5, 6, 7, 8, 9, 10) },
"testTracebackArgs6a(0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa)",
},
// has ... for 11 args
{
func() int { return testTracebackArgs6b(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11) },
"testTracebackArgs6b(0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, ...)",
},
// no ... for aggregates with 10 words
{
func() int { return testTracebackArgs7a([10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}) },
"testTracebackArgs7a({0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa})",
},
// has ... for aggregates with 11 words
{
func() int { return testTracebackArgs7b([11]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}) },
"testTracebackArgs7b({0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, ...})",
},
// no ... for aggregates, but with more args
{
func() int { return testTracebackArgs7c([10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, 11) },
"testTracebackArgs7c({0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa}, ...)",
},
// has ... for aggregates and also for more args
{
func() int { return testTracebackArgs7d([11]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}, 12) },
"testTracebackArgs7d({0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, ...}, ...)",
},
// nested aggregates, no ...
{
func() int { return testTracebackArgs8a(testArgsType8a{1, 2, 3, 4, 5, 6, 7, 8, [2]int{9, 10}}) },
"testTracebackArgs8a({0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, {0x9, 0xa}})",
},
// nested aggregates, ... in inner but not outer
{
func() int { return testTracebackArgs8b(testArgsType8b{1, 2, 3, 4, 5, 6, 7, 8, [3]int{9, 10, 11}}) },
"testTracebackArgs8b({0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, {0x9, 0xa, ...}})",
},
// nested aggregates, ... in outer but not inner
{
func() int { return testTracebackArgs8c(testArgsType8c{1, 2, 3, 4, 5, 6, 7, 8, [2]int{9, 10}, 11}) },
"testTracebackArgs8c({0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, {0x9, 0xa}, ...})",
},
// nested aggregates, ... in both inner and outer
{
func() int { return testTracebackArgs8d(testArgsType8d{1, 2, 3, 4, 5, 6, 7, 8, [3]int{9, 10, 11}, 12}) },
"testTracebackArgs8d({0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, {0x9, 0xa, ...}, ...})",
},
// Register argument liveness.
// 1, 3 are used and live, 2, 4 are dead (in register ABI).
// Address-taken (7) and stack ({5, 6}) args are always live.
{
func() int {
poisonStack() // poison arg area to make output deterministic
return testTracebackArgs9(1, 2, 3, 4, [2]int{5, 6}, 7)
},
abiSel(
"testTracebackArgs9(0x1, 0xffffffff?, 0x3, 0xff?, {0x5, 0x6}, 0x7)",
"testTracebackArgs9(0x1, 0x2, 0x3, 0x4, {0x5, 0x6}, 0x7)"),
},
// No live.
// (Note: this assume at least 5 int registers if register ABI is used.)
{
func() int {
poisonStack() // poison arg area to make output deterministic
return testTracebackArgs10(1, 2, 3, 4, 5)
},
abiSel(
"testTracebackArgs10(0xffffffff?, 0xffffffff?, 0xffffffff?, 0xffffffff?, 0xffffffff?)",
"testTracebackArgs10(0x1, 0x2, 0x3, 0x4, 0x5)"),
},
// Conditional spills.
// Spill in conditional, not executed.
{
func() int {
poisonStack() // poison arg area to make output deterministic
return testTracebackArgs11a(1, 2, 3)
},
abiSel(
"testTracebackArgs11a(0xffffffff?, 0xffffffff?, 0xffffffff?)",
"testTracebackArgs11a(0x1, 0x2, 0x3)"),
},
// 2 spills in conditional, not executed; 3 spills in conditional, executed, but not statically known.
// So print 0x3?.
{
func() int {
poisonStack() // poison arg area to make output deterministic
return testTracebackArgs11b(1, 2, 3, 4)
},
abiSel(
"testTracebackArgs11b(0xffffffff?, 0xffffffff?, 0x3?, 0x4)",
"testTracebackArgs11b(0x1, 0x2, 0x3, 0x4)"),
},
}
for _, test := range tests {
n := test.fn()
got := testTracebackArgsBuf[:n]
if !bytes.Contains(got, []byte(test.expect)) {
t.Errorf("traceback does not contain expected string: want %q, got\n%s", test.expect, got)
}
}
}
//go:noinline
func testTracebackArgs1(a, b, c, d, e int) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a < 0 {
// use in-reg args to keep them alive
return a + b + c + d + e
}
return n
}
//go:noinline
func testTracebackArgs2(a bool, b struct {
a, b, c int
x [2]int
}, _ [0]int, d [3]byte) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a {
// use in-reg args to keep them alive
return b.a + b.b + b.c + b.x[0] + b.x[1] + int(d[0]) + int(d[1]) + int(d[2])
}
return n
}
//go:noinline
//go:registerparams
func testTracebackArgs3(x [3]byte, a, b, c int, y [3]byte) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a < 0 {
// use in-reg args to keep them alive
return int(x[0]) + int(x[1]) + int(x[2]) + a + b + c + int(y[0]) + int(y[1]) + int(y[2])
}
return n
}
//go:noinline
func testTracebackArgs4(a bool, x [1][1][1][1][1][1][1][1][1][1]int) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a {
panic(x) // use args to keep them alive
}
return n
}
//go:noinline
func testTracebackArgs5(a bool, x struct {
x int
y [0]int
z [2][0]int
}, _, _, _, _, _, _, _, _, _, _, _, _ [0]int) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a {
panic(x) // use args to keep them alive
}
return n
}
//go:noinline
func testTracebackArgs6a(a, b, c, d, e, f, g, h, i, j int) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a < 0 {
// use in-reg args to keep them alive
return a + b + c + d + e + f + g + h + i + j
}
return n
}
//go:noinline
func testTracebackArgs6b(a, b, c, d, e, f, g, h, i, j, k int) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a < 0 {
// use in-reg args to keep them alive
return a + b + c + d + e + f + g + h + i + j + k
}
return n
}
//go:noinline
func testTracebackArgs7a(a [10]int) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a[0] < 0 {
// use in-reg args to keep them alive
return a[1] + a[2] + a[3] + a[4] + a[5] + a[6] + a[7] + a[8] + a[9]
}
return n
}
//go:noinline
func testTracebackArgs7b(a [11]int) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a[0] < 0 {
// use in-reg args to keep them alive
return a[1] + a[2] + a[3] + a[4] + a[5] + a[6] + a[7] + a[8] + a[9] + a[10]
}
return n
}
//go:noinline
func testTracebackArgs7c(a [10]int, b int) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a[0] < 0 {
// use in-reg args to keep them alive
return a[1] + a[2] + a[3] + a[4] + a[5] + a[6] + a[7] + a[8] + a[9] + b
}
return n
}
//go:noinline
func testTracebackArgs7d(a [11]int, b int) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a[0] < 0 {
// use in-reg args to keep them alive
return a[1] + a[2] + a[3] + a[4] + a[5] + a[6] + a[7] + a[8] + a[9] + a[10] + b
}
return n
}
type testArgsType8a struct {
a, b, c, d, e, f, g, h int
i [2]int
}
type testArgsType8b struct {
a, b, c, d, e, f, g, h int
i [3]int
}
type testArgsType8c struct {
a, b, c, d, e, f, g, h int
i [2]int
j int
}
type testArgsType8d struct {
a, b, c, d, e, f, g, h int
i [3]int
j int
}
//go:noinline
func testTracebackArgs8a(a testArgsType8a) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a.a < 0 {
// use in-reg args to keep them alive
return a.b + a.c + a.d + a.e + a.f + a.g + a.h + a.i[0] + a.i[1]
}
return n
}
//go:noinline
func testTracebackArgs8b(a testArgsType8b) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a.a < 0 {
// use in-reg args to keep them alive
return a.b + a.c + a.d + a.e + a.f + a.g + a.h + a.i[0] + a.i[1] + a.i[2]
}
return n
}
//go:noinline
func testTracebackArgs8c(a testArgsType8c) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a.a < 0 {
// use in-reg args to keep them alive
return a.b + a.c + a.d + a.e + a.f + a.g + a.h + a.i[0] + a.i[1] + a.j
}
return n
}
//go:noinline
func testTracebackArgs8d(a testArgsType8d) int {
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a.a < 0 {
// use in-reg args to keep them alive
return a.b + a.c + a.d + a.e + a.f + a.g + a.h + a.i[0] + a.i[1] + a.i[2] + a.j
}
return n
}
// nosplit to avoid preemption or morestack spilling registers.
//
//go:nosplit
//go:noinline
func testTracebackArgs9(a int64, b int32, c int16, d int8, x [2]int, y int) int {
if a < 0 {
println(&y) // take address, make y live, even if no longer used at traceback
}
n := runtime.Stack(testTracebackArgsBuf[:], false)
if a < 0 {
// use half of in-reg args to keep them alive, the other half are dead
return int(a) + int(c)
}
return n
}
// nosplit to avoid preemption or morestack spilling registers.
//
//go:nosplit
//go:noinline
func testTracebackArgs10(a, b, c, d, e int32) int {
// no use of any args
return runtime.Stack(testTracebackArgsBuf[:], false)
}
// norace to avoid race instrumentation changing spill locations.
// nosplit to avoid preemption or morestack spilling registers.
//
//go:norace
//go:nosplit
//go:noinline
func testTracebackArgs11a(a, b, c int32) int {
if a < 0 {
println(a, b, c) // spill in a conditional, may not execute
}
if b < 0 {
return int(a + b + c)
}
return runtime.Stack(testTracebackArgsBuf[:], false)
}
// norace to avoid race instrumentation changing spill locations.
// nosplit to avoid preemption or morestack spilling registers.
//
//go:norace
//go:nosplit
//go:noinline
func testTracebackArgs11b(a, b, c, d int32) int {
var x int32
if a < 0 {
print() // spill b in a conditional
x = b
} else {
print() // spill c in a conditional
x = c
}
if d < 0 { // d is always needed
return int(x + d)
}
return runtime.Stack(testTracebackArgsBuf[:], false)
}
// Poison the arg area with deterministic values.
//
//go:noinline
func poisonStack() [20]int {
return [20]int{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}
}
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