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package interp
import (
"io/ioutil"
"os"
"strings"
"testing"
"tinygo.org/x/go-llvm"
)
func TestInterp(t *testing.T) {
for _, name := range []string{
"basic",
"slice-copy",
} {
name := name // make tc local to this closure
t.Run(name, func(t *testing.T) {
t.Parallel()
runTest(t, "testdata/"+name)
})
}
}
func runTest(t *testing.T, pathPrefix string) {
// Read the input IR.
ctx := llvm.NewContext()
buf, err := llvm.NewMemoryBufferFromFile(pathPrefix + ".ll")
os.Stat(pathPrefix + ".ll") // make sure this file is tracked by `go test` caching
if err != nil {
t.Fatalf("could not read file %s: %v", pathPrefix+".ll", err)
}
mod, err := ctx.ParseIR(buf)
if err != nil {
t.Fatalf("could not load module:\n%v", err)
}
// Perform the transform.
err = Run(mod, false)
if err != nil {
t.Fatal(err)
}
// Run some cleanup passes to get easy-to-read outputs.
pm := llvm.NewPassManager()
defer pm.Dispose()
pm.AddGlobalOptimizerPass()
pm.AddDeadStoreEliminationPass()
pm.Run(mod)
// Read the expected output IR.
out, err := ioutil.ReadFile(pathPrefix + ".out.ll")
if err != nil {
t.Fatalf("could not read output file %s: %v", pathPrefix+".out.ll", err)
}
// See whether the transform output matches with the expected output IR.
expected := string(out)
actual := mod.String()
if !fuzzyEqualIR(expected, actual) {
t.Logf("output does not match expected output:\n%s", actual)
t.Fail()
}
}
// fuzzyEqualIR returns true if the two LLVM IR strings passed in are roughly
// equal. That means, only relevant lines are compared (excluding comments
// etc.).
func fuzzyEqualIR(s1, s2 string) bool {
lines1 := filterIrrelevantIRLines(strings.Split(s1, "\n"))
lines2 := filterIrrelevantIRLines(strings.Split(s2, "\n"))
if len(lines1) != len(lines2) {
return false
}
for i, line := range lines1 {
if line != lines2[i] {
return false
}
}
return true
}
// filterIrrelevantIRLines removes lines from the input slice of strings that
// are not relevant in comparing IR. For example, empty lines and comments are
// stripped out.
func filterIrrelevantIRLines(lines []string) []string {
var out []string
for _, line := range lines {
if line == "" || line[0] == ';' {
continue
}
if strings.HasPrefix(line, "source_filename = ") {
continue
}
out = append(out, line)
}
return out
}
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