(refs #7567) Added throw function to builtins

[simantics/platform.git] / bundles / org.simantics.scl.compiler / src / org / simantics / scl / compiler / constants / singletons / ThrowFunction.java

diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/constants/singletons/ThrowFunction.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/constants/singletons/ThrowFunction.java
new file mode 100644 (file)
index 0000000..f98e635
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/constants/singletons/ThrowFunction.java
@@ -0,0 +1,52 @@
+package org.simantics.scl.compiler.constants.singletons;
+
+import org.simantics.scl.compiler.constants.FunctionValue;
+import org.simantics.scl.compiler.internal.codegen.references.Val;
+import org.simantics.scl.compiler.internal.codegen.ssa.SSABlock;
+import org.simantics.scl.compiler.internal.codegen.ssa.SSAStatement;
+import org.simantics.scl.compiler.internal.codegen.ssa.exits.Throw2;
+import org.simantics.scl.compiler.internal.codegen.ssa.statements.LetApply;
+import org.simantics.scl.compiler.internal.codegen.utils.MethodBuilder;
+import org.simantics.scl.compiler.internal.codegen.utils.SSASimplificationContext;
+import org.simantics.scl.compiler.types.TVar;
+import org.simantics.scl.compiler.types.Type;
+import org.simantics.scl.compiler.types.Types;
+import org.simantics.scl.compiler.types.kinds.Kinds;
+
+public class ThrowFunction extends FunctionValue {
+
+    private static final TVar A = Types.var(Kinds.STAR);
+    private static final TVar B = Types.var(Kinds.STAR);
+    public static final ThrowFunction INSTANCE = 
+            new ThrowFunction();
+    
+    private ThrowFunction() {
+        super(new TVar[] {A, B}, Types.PROC, B, A);
+    }
+    
+    @Override
+    public Type applyExact(MethodBuilder mb, Val[] parameters) {
+        mb.pushBoxed(parameters[0]);
+        mb.throwObject();
+        return getReturnType();
+    }
+
+    @Override
+    public String toString() {
+         return "throw";
+    }
+    
+    @Override
+    public void inline(SSASimplificationContext context, LetApply apply) {
+        if(apply.getParameters().length != 1)
+            return; // shouldn't be possible
+        
+        SSABlock block = apply.getParent();
+        for(SSAStatement statement=apply.getNext();statement != null;statement=statement.getNext())
+            statement.destroy();
+        apply.getFunction().remove();
+        apply.detachThisAndSuccessors();
+        block.getExit().destroy();
+        block.setExit(new Throw2(apply.getParameters()[0]));
+    }
+}