88 lines
2.6 KiB
Go
88 lines
2.6 KiB
Go
// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
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// SPDX-License-Identifier: BSD-3-Clause
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package verify
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import (
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"bytes"
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"os"
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"testing"
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"sourcedock.dev/petrbalvin/gasm-devkit/asm"
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"sourcedock.dev/petrbalvin/gasm-devkit/parser"
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)
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// TestGroundTruthARM64 assembles the arm64 test kernels with gasm and
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// compares them byte-for-byte against `go tool asm` (GOARCH=arm64). The
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// relocation fields of static-symbol references are masked before the
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// comparison, since the toolchain leaves them zero for the linker.
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func TestGroundTruthARM64(t *testing.T) {
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for _, path := range []string{
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"../testdata/verify/basic_arm64.s",
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"../testdata/verify/fp_arm64.s",
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"../testdata/verify/movimm_arm64.s",
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"../testdata/verify/branch_arm64.s",
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"../testdata/verify/call_arm64.s",
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"../testdata/verify/bigframe_arm64.s",
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"../testdata/verify/guard_arm64.s",
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"../testdata/verify/indirect_arm64.s",
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} {
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t.Run(path, func(t *testing.T) {
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src, err := os.ReadFile(path)
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if err != nil {
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t.Fatalf("read: %v", err)
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}
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f, errs := parser.Parse(path, string(src))
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if len(errs) > 0 {
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t.Fatalf("parse: %v", errs)
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}
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img, err := asm.AssembleFileARM64(f)
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if err != nil {
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t.Fatalf("AssembleFileARM64: %v", err)
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}
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gt, err := GroundTruthARM64(path)
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if err != nil {
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t.Fatalf("GroundTruthARM64: %v", err)
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}
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matched := 0
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for _, fn := range img.Funcs {
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gasmCode := maskRelocs(append([]byte(nil), img.Code[fn.Offset:fn.Offset+fn.Size]...), fn.Relocs)
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goCode, ok := gt[fn.Name]
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if !ok {
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t.Errorf("%s: not in ground truth (%d functions)", fn.Name, len(gt))
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continue
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}
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goCode = maskRelocs(goCode, fn.Relocs)
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// The Go toolchain may add zero padding at the end of
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// functions. Compare up to the shorter length, then
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// verify any trailing bytes are zero.
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cmpLen := min(len(goCode), len(gasmCode))
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if !bytes.Equal(gasmCode[:cmpLen], goCode[:cmpLen]) {
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t.Errorf("%s: MISMATCH gasm=%d go=%d bytes\n%s", fn.Name, len(gasmCode), len(goCode), diffHex(gasmCode, goCode))
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continue
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}
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// Check trailing padding is zero.
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trailingOK := true
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if len(goCode) > len(gasmCode) {
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for _, b := range goCode[len(gasmCode):] {
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if b != 0 {
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trailingOK = false
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break
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}
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}
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}
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if !trailingOK {
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t.Errorf("%s: non-zero trailing bytes in go tool asm output", fn.Name)
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continue
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}
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matched++
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t.Logf("%s: MATCH (%d bytes, go=%d)", fn.Name, fn.Size, len(goCode))
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}
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if matched == 0 {
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t.Fatal("no functions matched")
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}
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})
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}
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}
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