# HG changeset patch
# User Jaroslav Tulach <jaroslav.tulach@apidesign.org>
# Date 1350482344 -7200
# Node ID 3d5597011af098a7128a3ba510e95a798142bf2a
# Parent  a0505844750a9b9168f0dec0a48bd5010871be9a
Support for switch

diff -r a0505844750a -r 3d5597011af0 vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Tue Oct 16 18:04:11 2012 +0200
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Wed Oct 17 15:59:04 2012 +0200
@@ -569,6 +569,43 @@
                     i += 2;
                     break;
                 }
+                case bc_lookupswitch: {
+                    int table = (i - 1) / 4 * 4 + 4;
+                    int dflt = i + readInt4(byteCodes, table);
+                    table += 4;
+                    int n = readInt4(byteCodes, table);
+                    table += 4;
+                    out.append("switch (stack.pop()) {\n");
+                    while (n-- > 0) {
+                        int cnstnt = readInt4(byteCodes, table);
+                        table += 4;
+                        int offset = i + readInt4(byteCodes, table);
+                        table += 4;
+                        out.append("  case " + cnstnt).append(": gt = " + offset).append("; continue;\n");
+                    }
+                    out.append("  default: gt = " + dflt).append("; continue;\n}");
+                    i = table - 1;
+                    break;
+                }
+                case bc_tableswitch: {
+                    int table = (i - 1) / 4 * 4 + 4;
+                    int dflt = i + readInt4(byteCodes, table);
+                    table += 4;
+                    int low = readInt4(byteCodes, table);
+                    table += 4;
+                    int high = readInt4(byteCodes, table);
+                    table += 4;
+                    out.append("switch (stack.pop()) {\n");
+                    while (low <= high) {
+                        int offset = i + readInt4(byteCodes, table);
+                        table += 4;
+                        out.append("  case " + low).append(": gt = " + offset).append("; continue;\n");
+                        low++;
+                    }
+                    out.append("  default: gt = " + dflt).append("; continue;\n}");
+                    i = table - 1;
+                    break;
+                }
                 case bc_invokeinterface: {
                     i = invokeVirtualMethod(byteCodes, i) + 2;
                     break;
@@ -731,6 +768,13 @@
         final int indxLo = byteCodes[offsetInstruction + 2];
         return (indxHi & 0xffffff00) | (indxLo & 0xff);
     }
+    private int readInt4(byte[] byteCodes, int offsetInstruction) {
+        final int d = byteCodes[offsetInstruction + 0] << 24;
+        final int c = byteCodes[offsetInstruction + 1] << 16;
+        final int b = byteCodes[offsetInstruction + 2] << 8;
+        final int a = byteCodes[offsetInstruction + 3];
+        return (d & 0xff000000) | (c & 0xff0000) | (b & 0xff00) | (a & 0xff);
+    }
     
     private static int countArgs(String descriptor, boolean[] hasReturnType, StringBuilder sig) {
         int cnt = 0;
diff -r a0505844750a -r 3d5597011af0 vm/src/test/java/org/apidesign/vm4brwsr/StaticMethod.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/StaticMethod.java	Tue Oct 16 18:04:11 2012 +0200
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/StaticMethod.java	Wed Oct 17 15:59:04 2012 +0200
@@ -118,6 +118,23 @@
         throw new IllegalStateException();
     }
     
+    public static String swtch(int what) {
+        switch (what) {
+            case 0: return "Jarda";
+            case 1: return "Darda";
+            case 2: return "Parda";
+            default: return "Marda";
+        }
+    }
+    public static String swtch2(int what) {
+        switch (what) {
+            case 0: return "Jarda";
+            case 11: return "Darda";
+            case 22: return "Parda";
+            default: return "Marda";
+        }
+    }
+    
     static {
         // check order of initializers
         StaticUse.NON_NULL.equals(new Object());
diff -r a0505844750a -r 3d5597011af0 vm/src/test/java/org/apidesign/vm4brwsr/StaticMethodTest.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/StaticMethodTest.java	Tue Oct 16 18:04:11 2012 +0200
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/StaticMethodTest.java	Wed Oct 17 15:59:04 2012 +0200
@@ -211,6 +211,40 @@
         );
     }
     
+    @Test public void switchJarda() throws Exception {
+        assertExec(
+            "The expected value",
+            "org_apidesign_vm4brwsr_StaticMethod_swtchLjava_lang_StringI",
+            "Jarda",
+            0
+        );
+    }
+    
+    @Test public void switchDarda() throws Exception {
+        assertExec(
+            "The expected value",
+            "org_apidesign_vm4brwsr_StaticMethod_swtchLjava_lang_StringI",
+            "Darda",
+            1
+        );
+    }
+    @Test public void switchParda() throws Exception {
+        assertExec(
+            "The expected value",
+            "org_apidesign_vm4brwsr_StaticMethod_swtch2Ljava_lang_StringI",
+            "Parda",
+            22
+        );
+    }
+    @Test public void switchMarda() throws Exception {
+        assertExec(
+            "The expected value",
+            "org_apidesign_vm4brwsr_StaticMethod_swtchLjava_lang_StringI",
+            "Marda",
+            -433
+        );
+    }
+    
     private static CharSequence codeSeq;
     private static Invocable code;