Add IR parser of catch blocks

core/src/main/java/org/teavm/model/ValueType.java

@@ -321,7 +321,7 @@ public abstract class ValueType {
                 return VOID;
             case 'L':
                 if (!string.endsWith(";")) {
-                    throw new IllegalArgumentException("Wrong type descriptor");
+                    return null;
                 }
                 return object(string.substring(1, string.length() - 1).replace('/', '.'));
             default:

core/src/main/java/org/teavm/model/text/ListingBuilder.java

@@ -78,14 +78,17 @@ public class ListingBuilder {
                 sb.append(prefix).append("    ").append(insnSb).append("\n");
             }
             for (TryCatchBlockReader tryCatch : block.readTryCatchBlocks()) {
-                sb.append(prefix).append("    catch ").append(tryCatch.getExceptionType())
+                sb.append(prefix).append("    catch ");
-                        .append(" -> $").append(tryCatch.getHandler().getIndex());
+                if (tryCatch.getExceptionType() != null) {
+                    InstructionStringifier.escapeStringLiteral(tryCatch.getExceptionType(), sb);
+                }
+                sb.append(" goto $").append(tryCatch.getHandler().getIndex());
                 sb.append("\n");
                 for (TryCatchJointReader joint : tryCatch.readJoints()) {
-                    sb.append("      @").append(joint.getReceiver().getIndex()).append(" := e-phi(");
+                    sb.append("      @").append(joint.getReceiver().getIndex()).append(" := ephi ");
                     sb.append(joint.readSourceVariables().stream().map(sourceVar -> "@" + sourceVar.getIndex())
                             .collect(Collectors.joining(", ")));
-                    sb.append(")\n");
+                    sb.append("\n");
                 }
             }
         }

core/src/main/java/org/teavm/model/text/ListingParser.java

@@ -33,6 +33,8 @@ import org.teavm.model.MethodReference;
 import org.teavm.model.Phi;
 import org.teavm.model.Program;
 import org.teavm.model.TextLocation;
+import org.teavm.model.TryCatchBlock;
+import org.teavm.model.TryCatchJoint;
 import org.teavm.model.ValueType;
 import org.teavm.model.Variable;
 import org.teavm.model.instructions.ArrayElementType;
@@ -88,6 +90,7 @@ public class ListingParser {
     private Set<String> declaredBlocks = new HashSet<>();
     private TextLocation currentLocation;
     private BasicBlock currentBlock;
+    private TryCatchBlock currentTryCatch;
 
     public Program parse(Reader reader) throws IOException, ListingParseException {
         try {
@@ -173,6 +176,7 @@ public class ListingParser {
             b.setLabel(k);
             return b;
         });
+        currentTryCatch = null;
 
         currentLocation = null;
         do {
@@ -268,6 +272,11 @@ public class ListingParser {
                         parseSwitch();
                         break;
                     }
+                    case "catch": {
+                        lexer.nextToken();
+                        parseCatch();
+                        break;
+                    }
                     default:
                         unexpected();
                         break;
@@ -344,6 +353,10 @@ public class ListingParser {
                         lexer.nextToken();
                         parsePhi(receiver);
                         break;
+                    case "ephi":
+                        lexer.nextToken();
+                        parseExceptionPhi(receiver);
+                        break;
                     case "classOf":
                         lexer.nextToken();
                         parseClassLiteral(receiver);
@@ -402,6 +415,15 @@ public class ListingParser {
                         parseFieldGet(receiver);
                         break;
                     }
+                    case "exception": {
+                        lexer.nextToken();
+                        if (!currentBlock.getInstructions().isEmpty() || currentBlock.getExceptionVariable() != null) {
+                            throw new ListingParseException("Exception can be read as a first instruction",
+                                    lexer.getTokenStart());
+                        }
+                        currentBlock.setExceptionVariable(receiver);
+                        break;
+                    }
                     default:
                         unexpected();
                         break;
@@ -563,6 +585,24 @@ public class ListingParser {
         currentBlock.getPhis().add(phi);
     }
 
+    private void parseExceptionPhi(Variable receiver) throws IOException, ListingParseException {
+        int phiStart = lexer.getIndex();
+
+        TryCatchJoint joint = new TryCatchJoint();
+        joint.setReceiver(receiver);
+        joint.getSourceVariables().add(expectVariable());
+        while (lexer.getToken() == ListingToken.COMMA) {
+            lexer.nextToken();
+            joint.getSourceVariables().add(expectVariable());
+        }
+
+        if (currentTryCatch == null) {
+            throw new ListingParseException("Exception phi must appear right after catch block", phiStart);
+        }
+
+        currentTryCatch.getJoints().add(joint);
+    }
+
     private void parseClassLiteral(Variable receiver) throws IOException, ListingParseException {
         ValueType type = expectValueType();
         ClassConstantInstruction insn = new ClassConstantInstruction();
@@ -736,6 +776,18 @@ public class ListingParser {
         }
     }
 
+    private void parseCatch() throws IOException, ListingParseException {
+        TryCatchBlock tryCatch = new TryCatchBlock();
+        if (lexer.getToken() == ListingToken.IDENTIFIER) {
+            tryCatch.setExceptionType((String) lexer.getTokenValue());
+            lexer.nextToken();
+        }
+        expectKeyword("goto");
+        tryCatch.setHandler(expectBlock());
+        currentTryCatch = tryCatch;
+        currentBlock.getTryCatchBlocks().add(tryCatch);
+    }
+
     private void parseCast(Variable receiver) throws IOException, ListingParseException {
         lexer.nextToken();
         Variable value = expectVariable();
@@ -1109,7 +1161,8 @@ public class ListingParser {
         throw new ListingParseException("Unexpected token " + lexer.getToken(), lexer.getTokenStart());
     }
 
-    private void addInstruction(Instruction instruction) {
+    private void addInstruction(Instruction instruction) throws ListingParseException {
+        currentTryCatch = null;
         instruction.setLocation(currentLocation);
         currentBlock.getInstructions().add(instruction);
     }

core/src/test/java/org/teavm/model/text/ParserTest.java

@@ -146,6 +146,11 @@ public class ParserTest {
         runTest("switchInsn");
     }
 
+    @Test
+    public void exceptions() throws Exception {
+        runTest("exceptions");
+    }
+
     private Program runTest(String name) throws IOException {
         ClassLoader classLoader = ParserTest.class.getClassLoader();
         String path = "model/text/" + name + ".txt";

core/src/test/resources/model/text/exceptions.txt

@@ -0,0 +1,14 @@
+$start
+    @a_1 := 0
+    invokeStatic `foo.Bar.baz()I`
+    @a_2 := 1
+    invokeStatic `foo.Bar.baz()I`
+    @a_3 := 2
+    return @a_3
+catch java.lang.Exception goto $handler
+    @a_h := ephi @a_1, @a_2, @a_3
+$handler
+    @e := exception
+    @out := field `java.lang.String.out` as `Ljava/io/PrintStream;`
+    invokeVirtual `java.io.PrintStream.println(Ljava/lang/Object;)V` @out, @e
+    return @a_h