Replace $(call my-dir) with a string literal

This is so that we can set LOCAL_PATH to the result
of my-dir, as LOCAL_PATH can only be set to a string
literal of the exact value of LOCAL_PATH.

It's probably also the correct choice to start phasing
out LOCAL_PATH.

Bug: 214405650
Test: go test
Change-Id: Ia97d7fedf4ce62643921d90a176e65edd4e2fce6

mk2rbc/mk2rbc.go

@@ -1370,7 +1370,7 @@ func (p *myDirCallParser) parse(ctx *parseContext, node mkparser.Node, args *mkp
 	if !args.Empty() {
 		return ctx.newBadExpr(node, "my-dir function cannot have any arguments passed to it.")
 	}
-	return &variableRefExpr{ctx.addVariable("LOCAL_PATH"), true}
+	return &stringLiteralExpr{literal: filepath.Dir(ctx.script.mkFile)}
 }
 
 type isProductInListCallParser struct{}

mk2rbc/mk2rbc_test.go

@@ -1451,6 +1451,19 @@ def init(g, handle):
   rblf.mk2rbc_error("product.mk:19", "type_hint annotations must come before the first Makefile statement")
   g["MY_VAR_4"] = "foo"
   _my_local_var_with_dashes = ["foo"]
+`,
+	},
+	{
+		desc:   "Set LOCAL_PATH to my-dir",
+		mkname: "product.mk",
+		in: `
+LOCAL_PATH := $(call my-dir)
+`,
+		expected: `load("//build/make/core:product_config.rbc", "rblf")
+
+def init(g, handle):
+  cfg = rblf.cfg(handle)
+  
 `,
 	},
 }

mk2rbc/variable.go

@@ -319,15 +319,13 @@ func (ctx *parseContext) addVariable(name string) variable {
 			v = &localVariable{baseVariable{nam: name, typ: hintType}}
 		} else {
 			vt := hintType
-			if strings.HasPrefix(name, "LOCAL_") && vt == starlarkTypeUnknown {
-				// Heuristics: local variables that contribute to corresponding config variables
-				if cfgVarName, found := localProductConfigVariables[name]; found {
-					vi, found2 := KnownVariables[cfgVarName]
-					if !found2 {
-						panic(fmt.Errorf("unknown config variable %s for %s", cfgVarName, name))
-					}
-					vt = vi.valueType
+			// Heuristics: local variables that contribute to corresponding config variables
+			if cfgVarName, found := localProductConfigVariables[name]; found && vt == starlarkTypeUnknown {
+				vi, found2 := KnownVariables[cfgVarName]
+				if !found2 {
+					panic(fmt.Errorf("unknown config variable %s for %s", cfgVarName, name))
 				}
+				vt = vi.valueType
 			}
 			if strings.HasSuffix(name, "_LIST") && vt == starlarkTypeUnknown {
 				// Heuristics: Variables with "_LIST" suffix are lists