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package builder
import (
"fmt"
"os"
"path/filepath"
"runtime"
"testing"
"github.com/tinygo-org/tinygo/compileopts"
"tinygo.org/x/go-llvm"
)
// Test whether the Clang generated "target-cpu" and "target-features"
// attributes match the CPU and Features property in TinyGo target files.
func TestClangAttributes(t *testing.T) {
var targetNames = []string{
// Please keep this list sorted!
"atmega328p",
"atmega1280",
"atmega1284p",
"atmega2560",
"attiny85",
"cortex-m0",
"cortex-m0plus",
"cortex-m3",
"cortex-m33",
"cortex-m4",
"cortex-m7",
"esp32c3",
"fe310",
"gameboy-advance",
"k210",
"nintendoswitch",
"riscv-qemu",
"wasip1",
"wasip2",
"wasm",
"wasm-unknown",
}
if hasBuiltinTools {
// hasBuiltinTools is set when TinyGo is statically linked with LLVM,
// which also implies it was built with Xtensa support.
targetNames = append(targetNames, "esp32", "esp8266")
}
for _, targetName := range targetNames {
targetName := targetName
t.Run(targetName, func(t *testing.T) {
testClangAttributes(t, &compileopts.Options{Target: targetName})
})
}
for _, options := range []*compileopts.Options{
{GOOS: "linux", GOARCH: "386"},
{GOOS: "linux", GOARCH: "amd64"},
{GOOS: "linux", GOARCH: "arm", GOARM: "5"},
{GOOS: "linux", GOARCH: "arm", GOARM: "6"},
{GOOS: "linux", GOARCH: "arm", GOARM: "7"},
{GOOS: "linux", GOARCH: "arm64"},
{GOOS: "linux", GOARCH: "mips"},
{GOOS: "linux", GOARCH: "mipsle"},
{GOOS: "darwin", GOARCH: "amd64"},
{GOOS: "darwin", GOARCH: "arm64"},
{GOOS: "windows", GOARCH: "amd64"},
{GOOS: "windows", GOARCH: "arm64"},
{GOOS: "wasip1", GOARCH: "wasm"},
{GOOS: "wasip2", GOARCH: "wasm"},
} {
name := "GOOS=" + options.GOOS + ",GOARCH=" + options.GOARCH
if options.GOARCH == "arm" {
name += ",GOARM=" + options.GOARM
}
t.Run(name, func(t *testing.T) {
testClangAttributes(t, options)
})
}
}
func testClangAttributes(t *testing.T, options *compileopts.Options) {
testDir := t.TempDir()
ctx := llvm.NewContext()
defer ctx.Dispose()
target, err := compileopts.LoadTarget(options)
if err != nil {
t.Fatalf("could not load target: %s", err)
}
config := compileopts.Config{
Options: options,
Target: target,
}
// Create a very simple C input file.
srcpath := filepath.Join(testDir, "test.c")
err = os.WriteFile(srcpath, []byte("int add(int a, int b) { return a + b; }"), 0o666)
if err != nil {
t.Fatalf("could not write target file %s: %s", srcpath, err)
}
// Compile this file using Clang.
outpath := filepath.Join(testDir, "test.bc")
flags := append([]string{"-c", "-emit-llvm", "-o", outpath, srcpath}, config.CFlags(false)...)
if config.GOOS() == "darwin" {
// Silence some warnings that happen when testing GOOS=darwin on
// something other than MacOS.
flags = append(flags, "-Wno-missing-sysroot", "-Wno-incompatible-sysroot")
}
err = runCCompiler(flags...)
if err != nil {
t.Fatalf("failed to compile %s: %s", srcpath, err)
}
// Read the resulting LLVM bitcode.
mod, err := ctx.ParseBitcodeFile(outpath)
if err != nil {
t.Fatalf("could not parse bitcode file %s: %s", outpath, err)
}
defer mod.Dispose()
// Check whether the LLVM target matches.
if mod.Target() != config.Triple() {
t.Errorf("target has LLVM triple %#v but Clang makes it LLVM triple %#v", config.Triple(), mod.Target())
}
// Check the "target-cpu" and "target-features" string attribute of the add
// function.
add := mod.NamedFunction("add")
var cpu, features string
cpuAttr := add.GetStringAttributeAtIndex(-1, "target-cpu")
featuresAttr := add.GetStringAttributeAtIndex(-1, "target-features")
if !cpuAttr.IsNil() {
cpu = cpuAttr.GetStringValue()
}
if !featuresAttr.IsNil() {
features = featuresAttr.GetStringValue()
}
if cpu != config.CPU() {
t.Errorf("target has CPU %#v but Clang makes it CPU %#v", config.CPU(), cpu)
}
if features != config.Features() {
if hasBuiltinTools || runtime.GOOS != "linux" {
// Skip this step when using an external Clang invocation on Linux.
// The reason is that Debian has patched Clang in a way that
// modifies the LLVM features string, changing lots of FPU/float
// related flags. We want to test vanilla Clang, not Debian Clang.
t.Errorf("target has LLVM features\n\t%#v\nbut Clang makes it\n\t%#v", config.Features(), features)
}
}
}
// This TestMain is necessary because TinyGo may also be invoked to run certain
// LLVM tools in a separate process. Not capturing these invocations would lead
// to recursive tests.
func TestMain(m *testing.M) {
if len(os.Args) >= 2 {
switch os.Args[1] {
case "clang", "ld.lld", "wasm-ld":
// Invoke a specific tool.
err := RunTool(os.Args[1], os.Args[2:]...)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
os.Exit(0)
}
}
// Run normal tests.
os.Exit(m.Run())
}
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