feat(lint): nonportable amd64 register name rule

2026-08-29 13:39:22 +02:00
parent d75e6bcae6
commit c92e6bed3a
3 changed files with 119 additions and 0 deletions
@@ -411,3 +411,28 @@ TEXT ·f(SB), NOSPLIT, $0
 		t.Fatalf("byte register in L op must be flagged: %+v", diags)
 	}
 }
+
+func TestNonportableRegisterName(t *testing.T) {
+	diags := lintSrc(t, `
+#include "textflag.h"
+TEXT ·f(SB), NOSPLIT, $0
+	MOVQ RAX, RBX
+	MOVQ EAX, R9
+	RET
+`)
+	// RAX and RBX (and EAX) are gasm aliases of AX/BX; R9 is canonical.
+	if got := codes(diags)[CodeNonportableRegister]; got != 3 {
+		t.Fatalf("want 3 nonportable-register-name, got %d: %+v", got, diags)
+	}
+
+	diags = lintSrc(t, `
+#include "textflag.h"
+TEXT ·f(SB), NOSPLIT, $0
+	MOVQ AX, BX
+	MOVQ (BX)(R9*4), R12
+	RET
+`)
+	if codes(diags)[CodeNonportableRegister] != 0 {
+		t.Fatalf("canonical names must not be flagged: %+v", diags)
+	}
+}