1 files changed, 64 insertions, 0 deletions
diff --git a/src/cmd/covdata/argsmerge.go b/src/cmd/covdata/argsmerge.go
new file mode 100644
index 0000000..8815a4a
--- /dev/null
+++ b/src/cmd/covdata/argsmerge.go
@@ -0,0 +1,64 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import "fmt"
+
+type argvalues struct {
+	osargs []string
+	goos   string
+	goarch string
+}
+
+type argstate struct {
+	state       argvalues
+	initialized bool
+}
+
+func ssleq(s1 []string, s2 []string) bool {
+	if len(s1) != len(s2) {
+		return false
+	}
+	for i := range s1 {
+		if s1[i] != s2[i] {
+			return false
+		}
+	}
+	return true
+}
+
+func (a *argstate) Merge(state argvalues) {
+	if !a.initialized {
+		a.state = state
+		a.initialized = true
+		return
+	}
+	if !ssleq(a.state.osargs, state.osargs) {
+		a.state.osargs = nil
+	}
+	if state.goos != a.state.goos {
+		a.state.goos = ""
+	}
+	if state.goarch != a.state.goarch {
+		a.state.goarch = ""
+	}
+}
+
+func (a *argstate) ArgsSummary() map[string]string {
+	m := make(map[string]string)
+	if len(a.state.osargs) != 0 {
+		m["argc"] = fmt.Sprintf("%d", len(a.state.osargs))
+		for k, a := range a.state.osargs {
+			m[fmt.Sprintf("argv%d", k)] = a
+		}
+	}
+	if a.state.goos != "" {
+		m["GOOS"] = a.state.goos
+	}
+	if a.state.goarch != "" {
+		m["GOARCH"] = a.state.goarch
+	}
+	return m
+}