--- /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.common.exceptions.InternalCompilerError;\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.BoundVar;\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.codegen.writer.RecursiveDefinitionWriter;\r
+import org.simantics.scl.compiler.internal.elaboration.decomposed.DecomposedExpression;\r
+import org.simantics.scl.compiler.internal.elaboration.utils.ExpressionDecorator;\r
+import org.simantics.scl.compiler.internal.elaboration.utils.StronglyConnectedComponents;\r
+import org.simantics.scl.compiler.types.Type;\r
+import org.simantics.scl.compiler.types.Types;\r
+import org.simantics.scl.compiler.types.exceptions.MatchException;\r
+import org.simantics.scl.compiler.types.kinds.Kinds;\r
+\r
+public class ELet extends Expression {\r
+ public Assignment[] assignments;\r
+ public Expression in;\r
+ \r
+ public ELet(long loc, Assignment[] assignments, Expression in) {\r
+ super(loc);\r
+ this.assignments = assignments;\r
+ this.in = in;\r
+ }\r
+\r
+ @Override\r
+ public void collectRefs(final TObjectIntHashMap<Object> allRefs, final TIntHashSet refs) {\r
+ for(Assignment assign : assignments)\r
+ assign.value.collectRefs(allRefs, refs);\r
+ in.collectRefs(allRefs, refs);\r
+ }\r
+ \r
+ @Override\r
+ public void collectVars(TObjectIntHashMap<Variable> allVars,\r
+ TIntHashSet vars) {\r
+ for(Assignment assign : assignments)\r
+ assign.value.collectVars(allVars, vars);\r
+ in.collectVars(allVars, vars);\r
+ }\r
+ \r
+ @Override\r
+ protected void updateType() throws MatchException {\r
+ setType(in.getType());\r
+ }\r
+ \r
+ /**\r
+ * Splits let \r
+ */\r
+ @Override\r
+ public Expression simplify(SimplificationContext context) {\r
+ \r
+ // Simplify assignments\r
+ for(Assignment assignment : assignments) {\r
+ assignment.value = assignment.value.simplify(context);\r
+ }\r
+ \r
+ // Find strongly connected components\r
+ final TObjectIntHashMap<Variable> allVars = new TObjectIntHashMap<Variable>(\r
+ 2*assignments.length, 0.5f, -1);\r
+\r
+ for(int i=0;i<assignments.length;++i)\r
+ for(Variable var : assignments[i].pattern.getFreeVariables())\r
+ allVars.put(var, i);\r
+ final boolean isRecursive[] = new boolean[assignments.length];\r
+ final ArrayList<int[]> components = new ArrayList<int[]>(Math.max(10, assignments.length)); \r
+ new StronglyConnectedComponents(assignments.length) {\r
+ @Override\r
+ protected int[] findDependencies(int u) {\r
+ TIntHashSet vars = new TIntHashSet();\r
+ assignments[u].value.collectVars(allVars, vars);\r
+ if(vars.contains(u))\r
+ isRecursive[u] = true;\r
+ return vars.toArray();\r
+ }\r
+\r
+ @Override\r
+ protected void reportComponent(int[] component) {\r
+ components.add(component);\r
+ }\r
+\r
+ }.findComponents();\r
+\r
+ // Simplify in\r
+ Expression result = in.simplify(context);\r
+ \r
+ // Handle each component\r
+ for(int j=components.size()-1;j>=0;--j) {\r
+ int[] component = components.get(j);\r
+ boolean recursive = component.length > 1 || isRecursive[component[0]];\r
+ if(recursive) {\r
+ Assignment[] cAssignments = new Assignment[component.length];\r
+ for(int i=0;i<component.length;++i)\r
+ cAssignments[i] = assignments[component[i]];\r
+ result = new ELet(location, cAssignments, result);\r
+ }\r
+ else {\r
+ Assignment assignment = assignments[component[0]];\r
+ Expression pattern = assignment.pattern;\r
+ \r
+ if(pattern instanceof EVariable) {\r
+ EVariable pvar = (EVariable)pattern;\r
+ result = new ESimpleLet(location, pvar.variable, assignment.value, result);\r
+ }\r
+ else {\r
+ result = new EMatch(location, new Expression[] {assignment.value},\r
+ new Case(new Expression[] {pattern}, result));\r
+ }\r
+ }\r
+ }\r
+ \r
+ return result;\r
+ }\r
+\r
+ @Override\r
+ public void collectFreeVariables(THashSet<Variable> vars) {\r
+ in.collectFreeVariables(vars);\r
+ for(Assignment assign : assignments)\r
+ assign.value.collectFreeVariables(vars);\r
+ for(Assignment assign : assignments) \r
+ assign.pattern.removeFreeVariables(vars);\r
+ }\r
+\r
+ @Override\r
+ public Expression resolve(TranslationContext context) {\r
+ throw new InternalCompilerError("ELet should be already resolved.");\r
+ }\r
+ \r
+ @Override\r
+ public Expression replace(ReplaceContext context) {\r
+ Assignment[] newAssignments = new Assignment[assignments.length];\r
+ for(int i=0;i<assignments.length;++i)\r
+ newAssignments[i] = assignments[i].replace(context); \r
+ Expression newIn = in.replace(context);\r
+ return new ELet(getLocation(), newAssignments, newIn);\r
+ }\r
+ \r
+ @Override\r
+ public IVal toVal(Environment env, CodeWriter w) {\r
+ // Create bound variables\r
+ BoundVar[] vars = new BoundVar[assignments.length];\r
+ for(int i=0;i<assignments.length;++i) {\r
+ Expression pattern = assignments[i].pattern;\r
+ if(!(pattern instanceof EVariable))\r
+ throw new InternalCompilerError("Cannot handle pattern targets in recursive assignments.");\r
+ vars[i] = new BoundVar(pattern.getType());\r
+ ((EVariable)pattern).getVariable().setVal(vars[i]);\r
+ }\r
+ \r
+ // Create values\r
+ RecursiveDefinitionWriter rdw = w.createRecursiveDefinition();\r
+ long range = Locations.NO_LOCATION;\r
+ for(Assignment assign2 : assignments) {\r
+ range = Locations.combine(range, assign2.pattern.location);\r
+ range = Locations.combine(range, assign2.value.location);\r
+ }\r
+ rdw.setLocation(range);\r
+ for(int i=0;i<assignments.length;++i) {\r
+ DecomposedExpression decomposed = \r
+ DecomposedExpression.decompose(assignments[i].value);\r
+ CodeWriter newW = rdw.createFunction(vars[i], \r
+ decomposed.typeParameters,\r
+ decomposed.effect,\r
+ decomposed.returnType, \r
+ decomposed.parameterTypes);\r
+ IVal[] parameters = newW.getParameters();\r
+ for(int j=0;j<parameters.length;++j)\r
+ decomposed.parameters[j].setVal(parameters[j]);\r
+ newW.return_(decomposed.body.toVal(env, newW));\r
+ }\r
+ return in.toVal(env, w);\r
+ }\r
+ \r
+ private void checkAssignments(TypingContext context) {\r
+ for(Assignment assign : assignments)\r
+ assign.pattern = assign.pattern.checkTypeAsPattern(context, Types.metaVar(Kinds.STAR));\r
+ for(Assignment assign : assignments)\r
+ assign.value = assign.value.checkType(context, assign.pattern.getType());\r
+ }\r
+ \r
+ @Override\r
+ public Expression inferType(TypingContext context) {\r
+ checkAssignments(context);\r
+ in = in.inferType(context);\r
+ return this;\r
+ }\r
+ \r
+ @Override\r
+ public Expression checkBasicType(TypingContext context, Type requiredType) {\r
+ checkAssignments(context);\r
+ in = in.checkType(context, requiredType);\r
+ return this;\r
+ }\r
+\r
+ @Override\r
+ public Expression decorate(ExpressionDecorator decorator) {\r
+ in = in.decorate(decorator);\r
+ for(Assignment assignment : assignments)\r
+ assignment.decorate(decorator);\r
+ return decorator.decorate(this);\r
+ }\r
+\r
+ @Override\r
+ public void collectEffects(THashSet<Type> effects) {\r
+ for(Assignment assignment : assignments) {\r
+ assignment.pattern.collectEffects(effects);\r
+ assignment.value.collectEffects(effects);\r
+ }\r
+ in.collectEffects(effects);\r
+ }\r
+ \r
+ @Override\r
+ public void setLocationDeep(long loc) {\r
+ if(location == Locations.NO_LOCATION) {\r
+ location = loc;\r
+ for(Assignment assignment : assignments)\r
+ assignment.setLocationDeep(loc);\r
+ in.setLocationDeep(loc);\r
+ }\r
+ }\r
+ \r
+ @Override\r
+ public void accept(ExpressionVisitor visitor) {\r
+ visitor.visit(this);\r
+ }\r
+\r
+ @Override\r
+ public void forVariables(VariableProcedure procedure) {\r
+ for(Assignment assignment : assignments)\r
+ assignment.forVariables(procedure);\r
+ in.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