1 package org.simantics.scl.compiler.elaboration.expressions;
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3 import java.util.ArrayList;
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5 import org.simantics.scl.compiler.common.names.Name;
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6 import org.simantics.scl.compiler.common.precedence.Precedence;
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7 import org.simantics.scl.compiler.constants.Constant;
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8 import org.simantics.scl.compiler.elaboration.contexts.ReplaceContext;
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9 import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;
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10 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;
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11 import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
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12 import org.simantics.scl.compiler.elaboration.errors.NotPatternException;
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13 import org.simantics.scl.compiler.elaboration.expressions.lhstype.LhsType;
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14 import org.simantics.scl.compiler.elaboration.expressions.lhstype.PatternMatchingLhs;
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15 import org.simantics.scl.compiler.elaboration.modules.SCLValue;
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16 import org.simantics.scl.compiler.environment.Environment;
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17 import org.simantics.scl.compiler.errors.Locations;
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18 import org.simantics.scl.compiler.internal.codegen.references.IVal;
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19 import org.simantics.scl.compiler.internal.codegen.writer.CodeWriter;
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20 import org.simantics.scl.compiler.internal.elaboration.utils.ExpressionDecorator;
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21 import org.simantics.scl.compiler.internal.interpreted.IConstant;
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22 import org.simantics.scl.compiler.internal.interpreted.IExpression;
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23 import org.simantics.scl.compiler.top.ExpressionInterpretationContext;
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24 import org.simantics.scl.compiler.top.SCLCompilerConfiguration;
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25 import org.simantics.scl.compiler.top.ValueNotFound;
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26 import org.simantics.scl.compiler.types.TForAll;
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27 import org.simantics.scl.compiler.types.TMetaVar;
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28 import org.simantics.scl.compiler.types.Type;
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29 import org.simantics.scl.compiler.types.Types;
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30 import org.simantics.scl.compiler.types.exceptions.MatchException;
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31 import org.simantics.scl.compiler.types.util.MultiFunction;
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32 import org.simantics.scl.compiler.types.util.TypeUnparsingContext;
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34 import gnu.trove.map.hash.TObjectIntHashMap;
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35 import gnu.trove.set.hash.THashSet;
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36 import gnu.trove.set.hash.TIntHashSet;
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38 public class EConstant extends Expression {
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40 Type[] typeParameters;
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42 public EConstant(SCLValue value, Type ... typeParameters) {
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43 if(SCLCompilerConfiguration.DEBUG)
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45 throw new NullPointerException();
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47 this.typeParameters = typeParameters;
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50 public EConstant(SCLValue value) {
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51 if(SCLCompilerConfiguration.DEBUG)
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53 throw new NullPointerException();
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55 this.typeParameters = Type.EMPTY_ARRAY;
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58 public EConstant(long loc, SCLValue value) {
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60 if(SCLCompilerConfiguration.DEBUG)
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62 throw new NullPointerException();
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64 this.typeParameters = Type.EMPTY_ARRAY;
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67 public EConstant(long loc, SCLValue value, Type ... typeParameters) {
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69 if(SCLCompilerConfiguration.DEBUG)
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71 throw new NullPointerException();
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73 this.typeParameters = typeParameters;
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76 public void addTypeParameters(Type ... newTypeParameters) {
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77 typeParameters = Types.concat(typeParameters, newTypeParameters);
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80 public Expression applyType(Type type) {
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81 typeParameters = Types.concat(typeParameters, new Type[] {type});
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82 if(getType() != null)
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83 setType(Types.instantiate(getType(), type));
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87 public void collectRefs(TObjectIntHashMap<Object> allRefs, TIntHashSet refs) {
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88 int id = allRefs.get(value);
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94 public void collectVars(TObjectIntHashMap<Variable> allVars,
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95 TIntHashSet vars) {
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98 public void toString(StringBuilder b, TypeUnparsingContext tuc) {
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99 Name name = value.getName();
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100 if(name.module.equals("Builtin") || name.module.equals("Prelude"))
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101 b.append(name.name);
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104 /*for(Type type : typeParameters) {
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106 b.append(type.toString(tuc));
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112 protected void updateType() throws MatchException {
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113 setType(Types.instantiate(value.getType(), typeParameters));
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117 public IVal toVal(Environment env, CodeWriter w) {
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118 IVal val = value.getValue();
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119 if(typeParameters.length > 0) {
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120 val = val.createSpecialization(typeParameters);
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126 public void collectFreeVariables(THashSet<Variable> vars) {
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130 public Expression simplify(SimplificationContext context) {
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131 if(value.getInlineInSimplification()) {
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132 if(typeParameters.length > 0) {
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133 context.getErrorLog().log(location,
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134 "Inlining with type parameters not currently supported in simplification.");
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138 return value.getExpression().copy().simplify(context);
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144 public Expression resolve(TranslationContext context) {
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149 public void getParameters(TranslationContext translationContext,
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150 ArrayList<Expression> parameters) {
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153 public SCLValue getValue() {
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158 public Expression resolveAsPattern(TranslationContext context) {
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163 public void removeFreeVariables(THashSet<Variable> vars) {
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167 public Expression replace(ReplaceContext context) {
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168 Type[] newTypeParameters;
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169 if(typeParameters.length == 0)
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170 newTypeParameters = Type.EMPTY_ARRAY;
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172 newTypeParameters = new Type[typeParameters.length];
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173 for(int i=0;i<newTypeParameters.length;++i)
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174 newTypeParameters[i] = typeParameters[i].replace(context.tvarMap);
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176 return new EConstant(value, newTypeParameters);
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179 public Type[] getTypeParameters() {
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180 return typeParameters;
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184 public LhsType getLhsType() throws NotPatternException {
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185 return new PatternMatchingLhs();
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189 public IExpression toIExpression(ExpressionInterpretationContext target) {
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190 Name name = value.getName();
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192 return new IConstant(target.runtimeEnvironment.getRuntimeModule(name.module).getValue(name.name));
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193 } catch (ValueNotFound e) {
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194 throw new UnsupportedOperationException();
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199 public Expression inferType(TypingContext context) {
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200 if(context.recursiveValues != null &&
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201 context.recursiveValues.contains(value)) {
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202 // Handles the case where the constant is one of the recursive definitions we are currently checking
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203 // This kind of value is not yet generalized, i.e. it is not necessary to instantiate it.
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204 EPlaceholder placeholder = new EPlaceholder(location, this);
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205 placeholder.setType(value.getType());
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207 context.recursiveReferences.add(placeholder);
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208 return placeholder;
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210 else if(context.isInPattern()) {
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211 /* This is little hackish code that handles the following kind of constructors:
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212 * data Thunk a = Thunk s (a -> s)
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214 * match thunk with Thunk s f -> f s
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215 * We cannot assign s with an unbound metaVar because its type depends on
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216 * how it has been constructed. Therefore we parametrize the function with
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217 * existential variable.
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219 Type resultType = value.getType();
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220 if(resultType instanceof TForAll) {
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221 ArrayList<TMetaVar> vars = new ArrayList<TMetaVar>();
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222 resultType = Types.instantiate(resultType, vars);
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223 MultiFunction mfun = Types.matchFunction(resultType);
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224 resultType = mfun.returnType;
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226 for(TMetaVar var : vars) {
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227 if(resultType.contains(var))
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229 addTypeParameters(Types.var(var.getKind()));
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235 return applyPUnit(context);
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239 public Expression decorate(ExpressionDecorator decorator) {
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240 return decorator.decorate(this);
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244 public boolean isEffectful() {
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249 public void collectEffects(THashSet<Type> effects) {
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253 public void setLocationDeep(long loc) {
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254 if(location == Locations.NO_LOCATION)
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259 public void accept(ExpressionVisitor visitor) {
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260 visitor.visit(this);
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264 public Precedence getPrecedence() {
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265 return value.getPrecedence();
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269 public void forVariables(VariableProcedure procedure) {
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273 public boolean isPattern(int arity) {
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274 IVal val = value.getValue();
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275 if(!(val instanceof Constant))
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277 Constant constant = (Constant)val;
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278 return constant.constructorTag() >= 0 && constant.getArity() == arity;
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282 public Expression accept(ExpressionTransformer transformer) {
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283 return transformer.transform(this);
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