Don't instrument roots without sources

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/compiler/SourceMap.java

@@ -117,6 +117,9 @@ private static int readNum(ByteArrayInputStream offsets) {
     }
 
     public static SourceSection getSourceSection(Source source, int startLine, int startColumn, int endLine, int endColumn) {
+        if (source == null || !source.hasCharacters()) {
+            return null;
+        }
         /* Truffle columns are 1-based and it doesn't consider the newline a part of the line */
         startColumn = Math.max(startColumn + 1, 1);
         endColumn = Math.max(Math.min(endColumn + 1, source.getLineLength(endLine)), 1);

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/bytecode/instrumentation/InstrumentationRootImpl.java

@@ -57,9 +57,11 @@ public InstrumentableNode materializeInstrumentableNodes(Set<Class<? extends Tag
         if (materializedTags.contains(StandardTags.StatementTag.class)) {
             if (instrumentationSupport == null) {
                 PBytecodeRootNode rootNode = (PBytecodeRootNode) getParent();
-                instrumentationSupport = insert(new InstrumentationSupport(rootNode));
-                rootNode.materializeContainedFunctionsForInstrumentation(materializedTags);
-                notifyInserted(instrumentationSupport);
+                if (rootNode.getSource() != null && rootNode.getSource().hasCharacters()) {
+                    instrumentationSupport = insert(new InstrumentationSupport(rootNode));
+                    rootNode.materializeContainedFunctionsForInstrumentation(materializedTags);
+                    notifyInserted(instrumentationSupport);
+                }
             }
         }
         return this;

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/bytecode/instrumentation/InstrumentationSupport.java

@@ -57,6 +57,7 @@ public final class InstrumentationSupport extends Node {
     @CompilationFinal(dimensions = 1) public Node[] bciToHelperNode;
 
     public InstrumentationSupport(PBytecodeRootNode rootNode) {
+        assert rootNode.getSource() != null && rootNode.getSource().hasCharacters();
         code = rootNode.getCodeUnit();
         lineToNode = new InstrumentedBytecodeStatement[code.endLine + 1];
         bciToHelperNode = new Node[code.code.length];