--- /dev/null
+package org.simantics.scl.compiler.elaboration.expressions;\r
+\r
+import gnu.trove.map.hash.TObjectIntHashMap;\r
+import gnu.trove.set.hash.THashSet;\r
+import gnu.trove.set.hash.TIntHashSet;\r
+\r
+import java.util.ArrayList;\r
+\r
+import org.simantics.scl.compiler.elaboration.contexts.ReplaceContext;\r
+import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;\r
+import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;\r
+import org.simantics.scl.compiler.elaboration.contexts.TypingContext;\r
+import org.simantics.scl.compiler.environment.Environment;\r
+import org.simantics.scl.compiler.errors.Locations;\r
+import org.simantics.scl.compiler.internal.codegen.references.IVal;\r
+import org.simantics.scl.compiler.internal.codegen.writer.CodeWriter;\r
+import org.simantics.scl.compiler.internal.elaboration.matching.PatternMatchingCompiler;\r
+import org.simantics.scl.compiler.internal.elaboration.matching.Row;\r
+import org.simantics.scl.compiler.internal.elaboration.utils.ExpressionDecorator;\r
+import org.simantics.scl.compiler.types.Type;\r
+import org.simantics.scl.compiler.types.Types;\r
+import org.simantics.scl.compiler.types.kinds.Kinds;\r
+\r
+public class EMatch extends Expression {\r
+\r
+ public Expression[] scrutinee;\r
+ public Case[] cases;\r
+ \r
+ public EMatch(Expression[] scrutinee, Case ... cases) {\r
+ this.scrutinee = scrutinee;\r
+ this.cases = cases;\r
+ }\r
+ \r
+ public EMatch(Expression scrutinee, Case ... cases) {\r
+ this(new Expression[] {scrutinee}, cases);\r
+ }\r
+\r
+ public EMatch(long loc, Expression[] scrutinee, Case ... cases) {\r
+ super(loc);\r
+ this.scrutinee = scrutinee;\r
+ this.cases = cases;\r
+ }\r
+\r
+ public void collectRefs(TObjectIntHashMap<Object> allRefs, TIntHashSet refs) {\r
+ for(Expression s : scrutinee)\r
+ s.collectRefs(allRefs, refs);\r
+ for(Case case_ : cases)\r
+ case_.collectRefs(allRefs, refs);\r
+ }\r
+ \r
+ @Override\r
+ public void collectVars(TObjectIntHashMap<Variable> allVars,\r
+ TIntHashSet vars) {\r
+ for(Expression s : scrutinee)\r
+ s.collectVars(allVars, vars);\r
+ for(Case case_ : cases)\r
+ case_.collectVars(allVars, vars);\r
+ }\r
+ \r
+ @Override\r
+ protected void updateType() {\r
+ setType(cases[0].value.getType());\r
+ }\r
+\r
+ @Override\r
+ public IVal toVal(Environment env, CodeWriter w) {\r
+ ArrayList<Row> rows = new ArrayList<Row>(cases.length);\r
+ for(Case case_ : cases)\r
+ rows.add(new Row(case_.patterns, case_.value));\r
+ \r
+ IVal[] scrutineeVals = new IVal[scrutinee.length];\r
+ for(int i=0;i<scrutinee.length;++i)\r
+ scrutineeVals[i] = scrutinee[i].toVal(env, w);\r
+ \r
+ CodeWriter joinPoint = w.createBlock(getType());\r
+ CodeWriter failurePoint = w.createBlock(); // TODO generate only one failurePoint per function\r
+ PatternMatchingCompiler.split(w, env, scrutineeVals, joinPoint.getContinuation(), failurePoint.getContinuation(), rows);\r
+ failurePoint.throw_(location, "Matching failure at: " + toString());\r
+ w.continueAs(joinPoint);\r
+ return w.getParameters()[0];\r
+ }\r
+\r
+ @Override\r
+ public void collectFreeVariables(THashSet<Variable> vars) {\r
+ for(Expression s : scrutinee)\r
+ s.collectFreeVariables(vars);\r
+ for(Case case_ : cases)\r
+ case_.collectFreeVariables(vars);\r
+ }\r
+ \r
+ @Override\r
+ public Expression simplify(SimplificationContext context) {\r
+ for(int i=0;i<scrutinee.length;++i)\r
+ scrutinee[i] = scrutinee[i].simplify(context);\r
+ for(Case case_ : cases)\r
+ case_.simplify(context); \r
+ if(cases.length == 1 && scrutinee.length == 1) {\r
+ Case case_ = cases[0];\r
+ Expression pattern = case_.patterns[0];\r
+ if(case_.patterns[0] instanceof EVariable\r
+ && !(case_.value instanceof GuardedExpressionGroup)) {\r
+ Variable var = ((EVariable)pattern).variable;\r
+ return new ESimpleLet(var, scrutinee[0], case_.value);\r
+ }\r
+ }\r
+ return this;\r
+ }\r
+\r
+ @Override\r
+ public Expression resolve(TranslationContext context) {\r
+ for(int i=0;i<scrutinee.length;++i)\r
+ scrutinee[i] = scrutinee[i].resolve(context);\r
+ for(Case case_ : cases)\r
+ case_.resolve(context);\r
+ return this;\r
+ }\r
+ \r
+ @Override\r
+ public void setLocationDeep(long loc) {\r
+ if(location == Locations.NO_LOCATION) {\r
+ location = loc;\r
+ for(Case case_ : cases)\r
+ case_.setLocationDeep(loc);\r
+ for(Expression e : scrutinee)\r
+ e.setLocationDeep(loc);\r
+ }\r
+ }\r
+ \r
+ @Override\r
+ public Expression replace(ReplaceContext context) {\r
+ Expression[] newScrutinee = new Expression[scrutinee.length];\r
+ for(int i=0;i<scrutinee.length;++i)\r
+ newScrutinee[i] = scrutinee[i].replace(context);\r
+ Case[] newCases = new Case[cases.length];\r
+ for(int i=0;i<cases.length;++i)\r
+ newCases[i] = cases[i].replace(context);\r
+ return new EMatch(getLocation(), newScrutinee, newCases);\r
+ }\r
+ \r
+ @Override\r
+ public Expression checkBasicType(TypingContext context, Type requiredType) {\r
+ Type[] scrutineeTypes = new Type[scrutinee.length];\r
+ for(int i=0;i<scrutinee.length;++i) {\r
+ scrutinee[i] = scrutinee[i].checkType(context, Types.metaVar(Kinds.STAR));\r
+ scrutineeTypes[i] = scrutinee[i].getType();\r
+ }\r
+ for(Case case_ : cases)\r
+ case_.checkType(context, scrutineeTypes, requiredType);\r
+ setType(requiredType);\r
+ return this;\r
+ }\r
+\r
+ @Override\r
+ public Expression decorate(ExpressionDecorator decorator) {\r
+ for(int i=0;i<scrutinee.length;++i)\r
+ scrutinee[i] = scrutinee[i].decorate(decorator);\r
+ for(Case case_ : cases)\r
+ case_.decorate(decorator);\r
+ return decorator.decorate(this);\r
+ }\r
+\r
+ @Override\r
+ public void collectEffects(THashSet<Type> effects) {\r
+ for(Expression s : scrutinee)\r
+ s.collectEffects(effects);\r
+ for(Case case_ : cases) {\r
+ for(Expression pattern : case_.patterns)\r
+ pattern.collectEffects(effects);\r
+ case_.value.collectEffects(effects);\r
+ }\r
+ }\r
+ \r
+ @Override\r
+ public void accept(ExpressionVisitor visitor) {\r
+ visitor.visit(this);\r
+ }\r
+ \r
+ public Expression[] getScrutinee() {\r
+ return scrutinee;\r
+ }\r
+ \r
+ public Case[] getCases() {\r
+ return cases;\r
+ }\r
+\r
+ @Override\r
+ public void forVariables(VariableProcedure procedure) {\r
+ for(Expression s : scrutinee)\r
+ s.forVariables(procedure);\r
+ for(Case case_ : cases)\r
+ case_.forVariables(procedure);\r
+ }\r
+ \r
+ @Override\r
+ public Expression accept(ExpressionTransformer transformer) {\r
+ return transformer.transform(this);\r
+ }\r
+\r
+}\r
Code Review / simantics / platform.git / blobdiff