1 package org.simantics.scl.compiler.elaboration.expressions;
3 import java.util.ArrayList;
5 import org.simantics.scl.compiler.common.names.Name;
6 import org.simantics.scl.compiler.common.precedence.Precedence;
7 import org.simantics.scl.compiler.compilation.CompilationContext;
8 import org.simantics.scl.compiler.constants.Constant;
9 import org.simantics.scl.compiler.elaboration.contexts.ReplaceContext;
10 import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;
11 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;
12 import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
13 import org.simantics.scl.compiler.elaboration.errors.NotPatternException;
14 import org.simantics.scl.compiler.elaboration.expressions.lhstype.LhsType;
15 import org.simantics.scl.compiler.elaboration.expressions.lhstype.PatternMatchingLhs;
16 import org.simantics.scl.compiler.elaboration.modules.SCLValue;
17 import org.simantics.scl.compiler.errors.Locations;
18 import org.simantics.scl.compiler.internal.codegen.references.IVal;
19 import org.simantics.scl.compiler.internal.codegen.writer.CodeWriter;
20 import org.simantics.scl.compiler.internal.interpreted.IConstant;
21 import org.simantics.scl.compiler.internal.interpreted.IExpression;
22 import org.simantics.scl.compiler.top.ExpressionInterpretationContext;
23 import org.simantics.scl.compiler.top.SCLCompilerConfiguration;
24 import org.simantics.scl.compiler.top.ValueNotFound;
25 import org.simantics.scl.compiler.types.TForAll;
26 import org.simantics.scl.compiler.types.TMetaVar;
27 import org.simantics.scl.compiler.types.Type;
28 import org.simantics.scl.compiler.types.Types;
29 import org.simantics.scl.compiler.types.exceptions.MatchException;
30 import org.simantics.scl.compiler.types.util.MultiFunction;
31 import org.simantics.scl.compiler.types.util.TypeUnparsingContext;
33 import gnu.trove.map.hash.TObjectIntHashMap;
34 import gnu.trove.set.hash.THashSet;
35 import gnu.trove.set.hash.TIntHashSet;
37 public class EConstant extends Expression {
38 public SCLValue value;
39 Type[] typeParameters;
41 public EConstant(SCLValue value, Type ... typeParameters) {
42 if(SCLCompilerConfiguration.DEBUG)
44 throw new NullPointerException();
46 this.typeParameters = typeParameters;
49 public EConstant(SCLValue value) {
50 if(SCLCompilerConfiguration.DEBUG)
52 throw new NullPointerException();
54 this.typeParameters = Type.EMPTY_ARRAY;
57 public EConstant(long loc, SCLValue value) {
59 if(SCLCompilerConfiguration.DEBUG)
61 throw new NullPointerException();
63 this.typeParameters = Type.EMPTY_ARRAY;
66 public EConstant(long loc, SCLValue value, Type ... typeParameters) {
68 if(SCLCompilerConfiguration.DEBUG)
70 throw new NullPointerException();
72 this.typeParameters = typeParameters;
75 public void addTypeParameters(Type ... newTypeParameters) {
76 typeParameters = Types.concat(typeParameters, newTypeParameters);
79 public Expression applyType(Type type) {
80 typeParameters = Types.concat(typeParameters, new Type[] {type});
82 setType(Types.instantiate(getType(), type));
87 public void collectVars(TObjectIntHashMap<Variable> allVars,
91 public void toString(StringBuilder b, TypeUnparsingContext tuc) {
92 Name name = value.getName();
93 if(name.module.equals("Builtin") || name.module.equals("Prelude"))
97 /*for(Type type : typeParameters) {
99 b.append(type.toString(tuc));
105 protected void updateType() throws MatchException {
106 setType(Types.instantiate(value.getType(), typeParameters));
110 public IVal toVal(CompilationContext context, CodeWriter w) {
111 IVal val = value.getValue();
112 if(typeParameters.length > 0) {
113 val = val.createSpecialization(typeParameters);
119 public void collectFreeVariables(THashSet<Variable> vars) {
123 public Expression simplify(SimplificationContext context) {
124 if(value.getInlineInSimplification()) {
125 if(typeParameters.length > 0) {
126 context.getErrorLog().log(location,
127 "Inlining with type parameters not currently supported in simplification.");
131 return value.getExpression().copy().simplify(context);
137 public Expression resolve(TranslationContext context) {
142 public void getParameters(TranslationContext translationContext,
143 ArrayList<Expression> parameters) {
146 public SCLValue getValue() {
151 public Expression resolveAsPattern(TranslationContext context) {
156 public void removeFreeVariables(THashSet<Variable> vars) {
160 public Expression replace(ReplaceContext context) {
161 Type[] newTypeParameters;
162 if(typeParameters.length == 0)
163 newTypeParameters = Type.EMPTY_ARRAY;
165 newTypeParameters = new Type[typeParameters.length];
166 for(int i=0;i<newTypeParameters.length;++i)
167 newTypeParameters[i] = typeParameters[i].replace(context.tvarMap);
169 return new EConstant(value, newTypeParameters);
172 public Type[] getTypeParameters() {
173 return typeParameters;
177 public LhsType getLhsType() throws NotPatternException {
178 return new PatternMatchingLhs();
182 public IExpression toIExpression(ExpressionInterpretationContext target) {
183 Name name = value.getName();
185 return new IConstant(target.runtimeEnvironment.getRuntimeModule(name.module).getValue(name.name));
186 } catch (ValueNotFound e) {
187 throw new UnsupportedOperationException();
192 public Expression inferType(TypingContext context) {
193 if(context.recursiveValues != null &&
194 context.recursiveValues.contains(value)) {
195 // Handles the case where the constant is one of the recursive definitions we are currently checking
196 // This kind of value is not yet generalized, i.e. it is not necessary to instantiate it.
197 EPlaceholder placeholder = new EPlaceholder(location, this);
198 placeholder.setType(value.getType());
200 context.recursiveReferences.add(placeholder);
203 else if(context.isInPattern()) {
204 /* This is little hackish code that handles the following kind of constructors:
205 * data Thunk a = Thunk s (a -> s)
207 * match thunk with Thunk s f -> f s
208 * We cannot assign s with an unbound metaVar because its type depends on
209 * how it has been constructed. Therefore we parametrize the function with
210 * existential variable.
212 Type resultType = value.getType();
213 if(resultType instanceof TForAll) {
214 ArrayList<TMetaVar> vars = new ArrayList<TMetaVar>();
215 resultType = Types.instantiate(resultType, vars);
216 MultiFunction mfun = Types.matchFunction(resultType);
217 resultType = mfun.returnType;
219 for(TMetaVar var : vars) {
220 if(resultType.contains(var))
222 addTypeParameters(Types.var(var.getKind()));
228 return applyPUnit(context);
232 public boolean isEffectful() {
237 public void collectEffects(THashSet<Type> effects) {
241 public void setLocationDeep(long loc) {
242 if(location == Locations.NO_LOCATION)
247 public void accept(ExpressionVisitor visitor) {
252 public Precedence getPrecedence() {
253 return value.getPrecedence();
257 public boolean isPattern(int arity) {
258 IVal val = value.getValue();
259 if(!(val instanceof Constant))
261 Constant constant = (Constant)val;
262 return constant.constructorTag() >= 0 && constant.getArity() == arity;
266 public Expression accept(ExpressionTransformer transformer) {
267 return transformer.transform(this);
271 public boolean equalsExpression(Expression expression) {
272 if(expression.getClass() != getClass())
274 EConstant other = (EConstant)expression;
275 return value == other.value && Types.equals(typeParameters, other.typeParameters);