00001: package clogs.transform;
00002:
00003: import clogs.ast.*;
00004: import clogs.util.List;
00005: import clogs.util.Optional;
00006:
00007:
00008: public class EliminateInitializers extends Phase
00009: {
00010: public List<ExtDecl> transform (List<ExtDecl> edecls)
00011: {
00012: List<ExtDecl> result = List.nil ();
00013:
00014: for (ExtDecl edecl : edecls) {
00015: if (edecl instanceof Decl) {
00016: result = result.snoc (edecl);
00017:
00018: } else if (edecl instanceof FunDef) {
00019: FunDef fundef = (FunDef) edecl;
00020: result = result.snoc (new FunDef (fundef.type, fundef.name, fundef.params, transformBody (fundef.body)));
00021:
00022: } else {
00023: throw new RuntimeException ("Missing ExtDecl case: " + edecl.getClass ().getName ());
00024: }
00025: }
00026:
00027: return result;
00028: }
00029:
00030:
00031: StatCompound transformBody (StatCompound statC) {
00032: List<Decl> declsNew = List.nil ();
00033: List<Stat> statsNew = List.nil ();
00034:
00035: for (Decl decl : statC.decls) {
00036: if (decl.eo.isEmpty ()) {
00037: declsNew = declsNew.snoc (decl);
00038: } else {
00039: declsNew = declsNew.snoc (new Decl (decl.type, decl.name, new Optional<Exp> ()));
00040: statsNew = statsNew.snoc (new StatExp (new ExpAssign (new ExpVar (decl.name), decl.eo.get ())));
00041: }
00042: }
00043:
00044: for (Stat stat : statC.stats) {
00045: statsNew = statsNew.snoc (transformStat (stat));
00046: }
00047:
00048: return new StatCompound (declsNew, statsNew);
00049: }
00050:
00051:
00052: Stat transformStat (Stat stat)
00053: {
00054: if (stat instanceof StatCompound) {
00055: StatCompound statC = (StatCompound) stat;
00056: return transformBody (statC).addLabels (statC.labels);
00057:
00058: } else if (stat instanceof StatExp) {
00059: return stat;
00060:
00061: } else if (stat instanceof StatGoto) {
00062: return stat;
00063:
00064: } else if (stat instanceof StatIf) {
00065: StatIf statI = (StatIf) stat;
00066: return new StatIf (statI.exp, transformStat (statI.statT), transformStat (statI.statF)).addLabels (statI.labels);
00067:
00068: } else if (stat instanceof StatReturn) {
00069: return stat;
00070:
00071: } else if (stat instanceof StatSkip) {
00072: return stat;
00073:
00074: } else if (stat instanceof StatWhile) {
00075: StatWhile statW = (StatWhile) stat;
00076: return new StatWhile (statW.exp, transformStat (statW.stat)).addLabels (statW.labels);
00077:
00078: } else {
00079: throw new RuntimeException ("Missing Stat case: " + stat.getClass ().getName ());
00080: }
00081: }
00082: }
00083:
00084:
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