1 package org.simantics.scl.compiler.elaboration.expressions;
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3 import org.simantics.scl.compiler.elaboration.contexts.ReplaceContext;
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4 import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;
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5 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;
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6 import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
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7 import org.simantics.scl.compiler.environment.Environment;
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8 import org.simantics.scl.compiler.errors.Locations;
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9 import org.simantics.scl.compiler.internal.codegen.references.IVal;
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10 import org.simantics.scl.compiler.internal.codegen.writer.CodeWriter;
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11 import org.simantics.scl.compiler.internal.elaboration.utils.ExpressionDecorator;
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12 import org.simantics.scl.compiler.internal.interpreted.IConstant;
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13 import org.simantics.scl.compiler.internal.interpreted.IExpression;
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14 import org.simantics.scl.compiler.internal.interpreted.IIf;
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15 import org.simantics.scl.compiler.top.ExpressionInterpretationContext;
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16 import org.simantics.scl.compiler.types.Type;
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17 import org.simantics.scl.compiler.types.Types;
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18 import org.simantics.scl.compiler.types.exceptions.MatchException;
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19 import org.simantics.scl.runtime.tuple.Tuple0;
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21 import gnu.trove.map.hash.TObjectIntHashMap;
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22 import gnu.trove.set.hash.THashSet;
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23 import gnu.trove.set.hash.TIntHashSet;
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25 public class EIf extends Expression {
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26 public Expression condition;
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27 public Expression then_;
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28 public Expression else_; // may be null
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30 public EIf(Expression condition, Expression then_, Expression else_) {
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31 this.condition = condition;
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36 public EIf(long loc, Expression condition, Expression then_, Expression else_) {
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38 this.condition = condition;
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43 public void collectRefs(TObjectIntHashMap<Object> allRefs, TIntHashSet refs) {
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44 condition.collectRefs(allRefs, refs);
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45 then_.collectRefs(allRefs, refs);
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47 else_.collectRefs(allRefs, refs);
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51 public void collectVars(TObjectIntHashMap<Variable> allVars,
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53 condition.collectVars(allVars, vars);
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54 then_.collectVars(allVars, vars);
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56 else_.collectVars(allVars, vars);
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60 protected void updateType() throws MatchException {
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61 setType(then_.getType());
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65 public IVal toVal(Environment env, CodeWriter w) {
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66 IVal conditionVal = condition.toVal(env, w);
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67 CodeWriter joinPoint = w.createBlock(getType());
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68 CodeWriter thenBlock = w.createBlock();
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70 CodeWriter elseBlock = w.createBlock();
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71 w.if_(conditionVal, thenBlock.getContinuation(), elseBlock.getContinuation());
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73 IVal elseVal = else_.toVal(env, elseBlock);
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74 elseBlock.jump(joinPoint.getContinuation(), elseVal);
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77 w.if_(conditionVal, thenBlock.getContinuation(), joinPoint.getContinuation());
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79 IVal thenVal = then_.toVal(env, thenBlock);
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80 thenBlock.jump(joinPoint.getContinuation(), thenVal);
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81 w.continueAs(joinPoint);
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83 return w.getParameters()[0];
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87 public void collectFreeVariables(THashSet<Variable> vars) {
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88 condition.collectFreeVariables(vars);
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89 then_.collectFreeVariables(vars);
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91 else_.collectFreeVariables(vars);
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95 public Expression simplify(SimplificationContext context) {
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96 condition = condition.simplify(context);
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97 then_ = then_.simplify(context);
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99 else_ = else_.simplify(context);
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104 public Expression resolve(TranslationContext context) {
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105 condition = condition.resolve(context);
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106 then_ = then_.resolve(context);
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108 else_ = else_.resolve(context);
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113 public Expression replace(ReplaceContext context) {
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114 return new EIf(condition.replace(context),
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115 then_.replace(context),
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116 else_ == null ? null : else_.replace(context));
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120 public Expression checkBasicType(TypingContext context, Type requiredType) {
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121 condition = condition.checkType(context, Types.BOOLEAN);
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122 then_ = then_.checkType(context, requiredType);
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124 else_ = else_.checkType(context, requiredType);
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126 context.getErrorLog().log(location, "Else branch is required because the return value of the if expression is used.");
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131 public Expression checkIgnoredType(TypingContext context) {
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132 condition = condition.checkType(context, Types.BOOLEAN);
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133 then_ = then_.checkIgnoredType(context);
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135 else_ = else_.checkIgnoredType(context);
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140 public Expression decorate(ExpressionDecorator decorator) {
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141 condition = condition.decorate(decorator);
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142 then_ = then_.decorate(decorator);
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144 else_ = else_.decorate(decorator);
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145 return decorator.decorate(this);
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149 public boolean isEffectful() {
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150 return condition.isEffectful() || then_.isEffectful() || (else_ != null && else_.isEffectful());
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154 public void collectEffects(THashSet<Type> effects) {
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155 condition.collectEffects(effects);
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156 then_.collectEffects(effects);
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158 else_.collectEffects(effects);
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162 public void setLocationDeep(long loc) {
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163 if(location == Locations.NO_LOCATION) {
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165 condition.setLocationDeep(loc);
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166 then_.setLocationDeep(loc);
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168 else_.setLocationDeep(loc);
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173 public void accept(ExpressionVisitor visitor) {
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174 visitor.visit(this);
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178 public IExpression toIExpression(ExpressionInterpretationContext target) {
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179 return new IIf(condition.toIExpression(target), then_.toIExpression(target),
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180 else_ != null ? else_.toIExpression(target) : new IConstant(Tuple0.INSTANCE));
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184 public void forVariables(VariableProcedure procedure) {
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185 condition.forVariables(procedure);
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186 then_.forVariables(procedure);
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188 else_.forVariables(procedure);
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191 public Expression accept(ExpressionTransformer transformer) {
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192 return transformer.transform(this);
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