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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/module/coverage/CoverageBuilder.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/module/coverage/CoverageBuilder.java
new file mode 100644
index 000000000..b3bfcd889
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/module/coverage/CoverageBuilder.java
@@ -0,0 +1,61 @@
+package org.simantics.scl.compiler.module.coverage;
+
+import org.simantics.scl.compiler.module.Module;
+import org.simantics.scl.runtime.profiling.BranchPoint;
+
+import gnu.trove.map.hash.THashMap;
+import gnu.trove.procedure.TObjectObjectProcedure;
+
+public class CoverageBuilder {
+    THashMap<String, THashMap<String, BranchPoint[]>> combined =
+            new THashMap<String, THashMap<String, BranchPoint[]>>();
+    
+    public void addCoverage(Module module) {
+        THashMap<String, BranchPoint[]> branchPointMap = module.getBranchPoints();
+        if(branchPointMap == null)
+            return;
+        THashMap<String, BranchPoint[]> oldBranchPointMap = combined.get(module.getName());
+        if(oldBranchPointMap == null) {
+            oldBranchPointMap = new THashMap<String, BranchPoint[]>();
+            combined.put(module.getName(), oldBranchPointMap);
+        }
+        THashMap<String, BranchPoint[]> oldBranchPointMap_ = oldBranchPointMap;
+        branchPointMap.forEachEntry(new TObjectObjectProcedure<String, BranchPoint[]>() {
+            @Override
+            public boolean execute(String name, BranchPoint[] branchPoints) {
+                BranchPoint[] oldBranchPoints = oldBranchPointMap_.get(name);
+                if(oldBranchPoints == null)
+                    oldBranchPointMap_.put(name, branchPoints);
+                else
+                    combineCounters(oldBranchPoints, branchPoints);
+                return true;
+            }
+        });
+    }
+    
+    private static void combineCounters(BranchPoint[] oldBranchPoints, BranchPoint[] branchPoints) {
+        if(oldBranchPoints.length != branchPoints.length)
+            throw new IllegalArgumentException("Incompatible branch points.");
+        for(int i=0;i<branchPoints.length;++i) {
+            BranchPoint oldBP = oldBranchPoints[i];
+            BranchPoint newBP = branchPoints[i];
+            if(oldBP.location != newBP.location)
+                throw new IllegalArgumentException("Incompatible branch points.");
+            oldBP.visitCounter += newBP.visitCounter;
+            combineCounters(oldBP.children, newBP.children);
+        }
+    }
+    
+    public CombinedCoverage getCoverage() {
+        THashMap<String,ModuleCoverage> moduleCoverages =
+                new THashMap<String,ModuleCoverage>();
+        combined.forEachEntry(new TObjectObjectProcedure<String, THashMap<String, BranchPoint[]>>() {
+            @Override
+            public boolean execute(String name, THashMap<String, BranchPoint[]> branchPoints) {
+                moduleCoverages.put(name, CoverageUtils.getCoverage(name, branchPoints));
+                return true;
+            }
+        });
+        return CoverageUtils.combineCoverages(moduleCoverages);
+    }
+}