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mi: read elements without per-call allocations (#2652)

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>
This commit is contained in:
Jan-Otto Kröpke
2026-10-10 16:40:12 +02:00
committed by GitHub
co-authored by Claude Opus 5.5
parent 40d7514078
commit 5e397bb34d
10 changed files with 288 additions and 25 deletions
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internal/mi/unmarshal_test.go
+29 -1
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@@ -23,6 +23,7 @@ import (
"testing"
"github.com/stretchr/testify/require"
"golang.org/x/sys/windows"
)
// newField returns a settable reflect.Value holding the zero value of T.
@@ -112,7 +113,34 @@ func TestPrepareUnmarshal(t *testing.T) {
fields, err := prepareUnmarshal(&dst)
require.NoError(t, err)
require.Empty(t, dst)
require.Equal(t, []miField{{index: 0, tag: "Name"}, {index: 2, tag: "ProcessId"}}, fields)
require.Len(t, fields, 2)
require.Equal(t, 0, fields[0].index)
require.Equal(t, "Name", fields[0].tag)
require.Equal(t, "Name", windows.UTF16PtrToString(fields[0].name))
require.Equal(t, 2, fields[1].index)
require.Equal(t, "ProcessId", fields[1].tag)
require.Equal(t, "ProcessId", windows.UTF16PtrToString(fields[1].name))
})
t.Run("fields_are_cached", func(t *testing.T) {
t.Parallel()
first, err := prepareUnmarshal(new([]row))
require.NoError(t, err)
second, err := prepareUnmarshal(new([]row))
require.NoError(t, err)
require.Same(t, &first[0], &second[0])
})
t.Run("tag_with_nul", func(t *testing.T) {
t.Parallel()
_, err := prepareUnmarshal(new([]struct {
Name string `mi:"Na\x00me"`
}))
require.Error(t, err)
})
t.Run("nil_pointer", func(t *testing.T) {