Add "highlight returns" render layer example

Author: CouleeApps

python/examples/highlight_returns_render_layer.py

@@ -0,0 +1,61 @@
+from typing import List, Optional
+
+import binaryninja
+from binaryninja import RenderLayer, InstructionTextToken, \
+    InstructionTextTokenType, HighlightColor, ThemeColor
+from binaryninjaui import getThemeColor
+
+
+"""
+Render Layer that highlights all lines in Linear View that have a return statement
+"""
+
+
+class HighlightReturnsLayer(RenderLayer):
+    name = "Highlight Returns"
+
+    # Highlighting in all ILs includes handling both normal blocks (up to MLIL) and HLIL bodies,
+    # since HLIL is special and gets its own handler.
+    def apply_to_high_level_il_body(
+            self,
+            function: 'binaryninja.Function',
+            lines: List['binaryninja.LinearDisassemblyLine']
+    ):
+        ret_color = getThemeColor(ThemeColor.GraphExitNodeIndicatorColor)
+        noret_color = getThemeColor(ThemeColor.GraphExitNoreturnNodeIndicatorColor)
+        ret_highlight = HighlightColor(red=ret_color.red(), green=ret_color.green(), blue=ret_color.blue())
+        noret_highlight = HighlightColor(red=noret_color.red(), green=noret_color.green(), blue=noret_color.blue())
+
+        # Basic check: if the line has a keyword token which is "return" or "noreturn"
+        for i, line in enumerate(lines):
+            if any(token.type == InstructionTextTokenType.KeywordToken and token.text.startswith("return") for token in line.contents.tokens):
+                line.contents.highlight = ret_highlight
+            elif any(token.type == InstructionTextTokenType.KeywordToken and token.text == "noreturn" for token in line.contents.tokens):
+                line.contents.highlight = noret_highlight
+        return lines
+
+    # Applies to MLIL and lower
+    def apply_to_block(
+            self,
+            block: 'binaryninja.BasicBlock',
+            lines: List['binaryninja.DisassemblyTextLine']
+    ):
+        ret_color = getThemeColor(ThemeColor.GraphExitNodeIndicatorColor)
+        noret_color = getThemeColor(ThemeColor.GraphExitNoreturnNodeIndicatorColor)
+        ret_highlight = HighlightColor(red=ret_color.red(), green=ret_color.green(), blue=ret_color.blue())
+        noret_highlight = HighlightColor(red=noret_color.red(), green=noret_color.green(), blue=noret_color.blue())
+
+        # Basic check: if the line has a keyword token which is "return" or "noreturn"
+        for i, line in enumerate(lines):
+            if any(token.type == InstructionTextTokenType.KeywordToken and token.text.startswith("return") for token in line.tokens):
+                line.highlight = ret_highlight
+            elif any(token.type == InstructionTextTokenType.KeywordToken and token.text == "noreturn" for token in line.tokens):
+                line.highlight = noret_highlight
+        return lines
+
+    def apply_to_flow_graph(self, graph: 'binaryninja.FlowGraph'):
+        # Ignore flow graphs, as this Render Layer should only apply to Linear View.
+        pass
+
+
+HighlightReturnsLayer.register()