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package main
import (
"bytes"
"os/exec"
"path/filepath"
"runtime"
"testing"
"time"
"github.com/tinygo-org/tinygo/builder"
"github.com/tinygo-org/tinygo/compileopts"
)
func TestTraceback(t *testing.T) {
if runtime.GOOS != "linux" {
// We care about testing the ELF format, which is only used on Linux
// (not on MacOS or Windows).
t.Skip("Test only works on Linux")
}
// Build a small binary that only panics.
tmpdir := t.TempDir()
config, err := builder.NewConfig(&compileopts.Options{
GOOS: runtime.GOOS,
GOARCH: runtime.GOARCH,
Opt: "z",
InterpTimeout: time.Minute,
Debug: true,
})
if err != nil {
t.Fatal(err)
}
result, err := builder.Build("testdata/trivialpanic.go", ".elf", tmpdir, config)
if err != nil {
t.Fatal(err)
}
// Run this binary, and capture the output.
buf := &bytes.Buffer{}
cmd := exec.Command(result.Binary)
cmd.Stdout = buf
cmd.Stderr = buf
cmd.Run() // this will return an error because of the panic, ignore it
// Extract the "runtime error at" address.
line := bytes.TrimSpace(buf.Bytes())
address := extractPanicAddress(line)
if address == 0 {
t.Fatalf("could not extract panic address from %#v", string(line))
}
// Look up the source location for this address.
location, err := addressToLine(result.Executable, address)
if err != nil {
t.Fatal("could not read source location:", err)
}
// Verify that the source location is as expected.
if filepath.Base(location.Filename) != "trivialpanic.go" {
t.Errorf("expected path to end with trivialpanic.go, got %#v", location.Filename)
}
if location.Line != 6 {
t.Errorf("expected panic location to be line 6, got line %d", location.Line)
}
}
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