Prevent androidmk crash on art/tools/ahat/Android.mk

Because a directive can exist within a rule's recipe,
there may not exist an ordering of nodes such that
nodes[i].End() <= nodes[i+1].Start()

This disables that assertion.

Test: androidmk art/tools/ahat/Android.mk
Bug: 67906386

Change-Id: I84ea6ebdbc01c1600b1fa188463aae56270f0135

2 files changed, 51 insertions, 4 deletions

diff --git a/androidmk/cmd/androidmk/androidmk.go b/androidmk/cmd/androidmk/androidmk.go
index a49f6200..5cb3f7ac 100644
--- a/androidmk/cmd/androidmk/androidmk.go
+++ b/androidmk/cmd/androidmk/androidmk.go
@@ -80,11 +80,23 @@ func (f *bpFile) addErrorText(message string) {
 }
 
 func (f *bpFile) setMkPos(pos, end scanner.Position) {
-	if pos.Line < f.mkPos.Line {
-		panic(fmt.Errorf("out of order lines, %q after %q", pos, f.mkPos))
+	// It is unusual but not forbidden for pos.Line to be smaller than f.mkPos.Line
+	// For example:
+	//
+	// if true                       # this line is emitted 1st
+	// if true                       # this line is emitted 2nd
+	// some-target: some-file        # this line is emitted 3rd
+	//         echo doing something  # this recipe is emitted 6th
+	// endif #some comment           # this endif is emitted 4th; this comment is part of the recipe
+	//         echo doing more stuff # this is part of the recipe
+	// endif                         # this endif is emitted 5th
+	//
+	// However, if pos.Line < f.mkPos.Line, we treat it as though it were equal
+	if pos.Line >= f.mkPos.Line {
+		f.bpPos.Line += (pos.Line - f.mkPos.Line)
+		f.mkPos = end
 	}
-	f.bpPos.Line += (pos.Line - f.mkPos.Line)
-	f.mkPos = end
+
 }
 
 type conditional struct {
diff --git a/androidmk/cmd/androidmk/androidmk_test.go b/androidmk/cmd/androidmk/androidmk_test.go
index 4681a7d2..0b865409 100644
--- a/androidmk/cmd/androidmk/androidmk_test.go
+++ b/androidmk/cmd/androidmk/androidmk_test.go
@@ -425,6 +425,41 @@ cc_library_shared {
   }
 }`,
 	},
+	{
+		// the important part of this test case is that it confirms that androidmk doesn't
+		// panic in this case
+		desc: "multiple directives inside recipe",
+		in: `
+ifeq ($(a),true)
+ifeq ($(b),false)
+imABuildStatement: somefile
+	echo begin
+endif # a==true
+	echo middle
+endif # b==false
+	echo end
+`,
+		expected: `
+// ANDROIDMK TRANSLATION ERROR: unsupported conditional
+// ifeq ($(a),true)
+
+// ANDROIDMK TRANSLATION ERROR: unsupported conditional
+// ifeq ($(b),false)
+
+// ANDROIDMK TRANSLATION ERROR: unsupported line
+// rule:       imABuildStatement: somefile
+// echo begin
+//  # a==true
+// echo middle
+//  # b==false
+// echo end
+//
+// ANDROIDMK TRANSLATION ERROR: endif from unsupported contitional
+// endif
+// ANDROIDMK TRANSLATION ERROR: endif from unsupported contitional
+// endif
+		`,
+	},
 }
 
 func reformatBlueprint(input string) string {