handle odd llvm with branches in the middle of labels; all tests pass

src/analyzer.js

@@ -39,6 +39,7 @@ function analyzer(data, givenTypes) {
       });
       // Functions & labels
       item.functions = [];
+      var currLabelFinished; // Sometimes LLVM puts a branch in the middle of a label. We need to ignore all lines after that.
       for (var i = 0; i < item.items.length; i++) {
         var subItem = item.items[i];
         if (subItem.intertype == 'function') {
@@ -60,10 +61,18 @@ function analyzer(data, givenTypes) {
         } else if (subItem.intertype == 'label') {
           item.functions.slice(-1)[0].labels.push(subItem);
           subItem.lines = [];
+          currLabelFinished = false;
         } else if (item.functions.length > 0 && item.functions.slice(-1)[0].endLineNum === null) {
           // Internal line
-          item.functions.slice(-1)[0].lines.push(subItem);
-          item.functions.slice(-1)[0].labels.slice(-1)[0].lines.push(subItem);
+          if (!currLabelFinished) {
+            item.functions.slice(-1)[0].lines.push(subItem);
+            item.functions.slice(-1)[0].labels.slice(-1)[0].lines.push(subItem);
+            if (subItem.intertype === 'branch') {
+              currLabelFinished = true;
+            }
+          } else {
+            print('// WARNING: content after a branch in a label, line: ' + subItem.lineNum);
+          }
         } else {
           print("ERROR: what is this? " + JSON.stringify(subItem));
         }

src/jsifier.js

@@ -442,7 +442,7 @@ function JSify(data, functionsOnly, givenTypes, givenFunctions, givenGlobalVaria
         if (block.type == 'emulated') {
           if (block.labels.length > 1) {
             if (block.entries.length == 1) {
-              ret += indent + '__label__ = ' + getLabelId(block.entries[0]) + '; /* ' + block.entries[0] + ' */\n';
+              ret += indent + '__label__ = ' + getLabelId(block.entries[0]) + '; ' + (SHOW_LABELS ? '/* ' + block.entries[0] + ' */' : '') + '\n';
             } // otherwise, should have been set before!
             ret += indent + 'while(1) switch(__label__) {\n';
             ret += block.labels.map(function(label) {
@@ -451,11 +451,11 @@ function JSify(data, functionsOnly, givenTypes, givenFunctions, givenGlobalVaria
             }).join('\n');
             ret += '\n' + indent + '  default: assert(0, "bad label: " + __label__);\n' + indent + '}';
           } else {
-            ret += getLabelLines(block.labels[0], indent);
+            ret += (SHOW_LABELS ? indent + '/* ' + block.entries[0] + ' */' : '') + '\n' + getLabelLines(block.labels[0], indent);
           }
           ret += '\n';
         } else if (block.type == 'reloop') {
-          ret += indent + block.id + ': while(1) { // ' + block.entries + '\n';
+          ret += indent + block.id + ': while(1) { ' + (SHOW_LABELS ? ' /* ' + block.entries + + ' */' : '') + '\n';
           ret += walkBlock(block.inner, indent + '  ');
           ret += indent + '}\n';
         } else if (block.type == 'multiple') {
@@ -632,7 +632,7 @@ function JSify(data, functionsOnly, givenTypes, givenFunctions, givenGlobalVaria
       var parts = label.split('|');
       var trueLabel = parts[1];
       var oldLabel = parts[2];
-      var labelSetting = '__label__ = ' + getLabelId(oldLabel) + '; /* ' + cleanLabel(oldLabel) + ' */ '; // TODO: optimize away
+      var labelSetting = '__label__ = ' + getLabelId(oldLabel) + ';' + (SHOW_LABELS ? ' /* to: ' + cleanLabel(oldLabel) + ' */' : ''); // TODO: optimize away
       if (label[1] == 'R') {
         return pre + labelSetting + 'break ' + trueLabel + ';';
       } else if (label[1] == 'C') { // CONT
@@ -645,7 +645,7 @@ function JSify(data, functionsOnly, givenTypes, givenFunctions, givenGlobalVaria
         throw 'Invalid B-op in branch: ' + trueLabel + ',' + oldLabel;
       }
     } else {
-      return pre + '__label__ = ' + getLabelId(label) + '; /* ' + cleanLabel(label) + ' */ break;';
+      return pre + '__label__ = ' + getLabelId(label) + ';' + (SHOW_LABELS ? ' /* to: ' + cleanLabel(label) + ' */' : '') + ' break;';
     }
   }
 

src/settings.js

@@ -51,6 +51,8 @@ CORRECT_OVERFLOWS = 1; // Experimental code that tries to prevent unexpected JS
                        // not rely on overflows in your C/C++ code, as even if this option works,
                        // it slows things down.
 
+SHOW_LABELS = 0; // Show labels in the generated code
+
 // Compiler debugging options
 DEBUG_TAGS_SHOWING = [];
   // Some useful items:

tests/cases/breakinthemiddle.ll

@@ -0,0 +1,18 @@
+@.str = private constant [15 x i8] c"hello, world!\0A\00", align 1 ; [#uses=1]
+
+define linkonce_odr i32* @main() align 2 {
+  %199 = trunc i8 1 to i1                        ; [#uses=1]
+  br i1 %199, label %555, label %569
+
+; <label>:555                                     ; preds = %353
+  br label %569
+                                                  ; No predecessors!
+  br label %569
+
+; <label>:569                                     ; preds = %555
+  %333 = call i32 @printf(i8* getelementptr inbounds ([15 x i8]* @.str, i32 0, i32 0)) ; [#uses=0]
+  ret i32 0
+}
+
+declare i32 @printf(i8*)
+