[svn r112] Fixed 'case 1,2,3:' style case statements.

Fixed a bunch of bugs with return/break/continue in loops.
Fixed support for the DMDFE hidden implicit return value variable. This can be needed for some foreach statements where the loop body is converted to a nested delegate, but also possibly returns from the function.
Added std.math to phobos.
Added AA runtime support code, done ground work for implementing AAs.
Several other bugfixes.

dmd/expression.c

@@ -5870,6 +5870,7 @@ Expression *AddrExp::semantic(Scope *sc)
 	{
 	    VarExp *dve = (VarExp *)e1;
 	    FuncDeclaration *f = dve->var->isFuncDeclaration();
+        VarDeclaration *v = dve->var->isVarDeclaration();
 
 	    if (f && f->isNested())
 	    {	Expression *e;
@@ -5878,6 +5879,10 @@ Expression *AddrExp::semantic(Scope *sc)
 		e = e->semantic(sc);
 		return e;
 	    }
+        else if (v)
+        {
+        v->llvmNeedsStorage = true;
+        }
 	}
 	else if (e1->op == TOKarray)
 	{
@@ -7543,6 +7548,7 @@ Expression *XorAssignExp::semantic(Scope *sc)
 AddExp::AddExp(Loc loc, Expression *e1, Expression *e2)
 	: BinExp(loc, TOKadd, sizeof(AddExp), e1, e2)
 {
+    llvmFieldIndex = false;
 }
 
 Expression *AddExp::semantic(Scope *sc)

dmd/expression.h

@@ -1121,6 +1121,9 @@ struct AddExp : BinExp
     Identifier *opId_r();
 
     elem *toElem(IRState *irs);
+
+    // LLVMDC
+    bool llvmFieldIndex;
 };
 
 struct MinExp : BinExp

dmd/mtype.c

@@ -4309,6 +4309,11 @@ L1:
 	b = new AddrExp(e->loc, e);
 	b->type = e->type->pointerTo();
 	b = new AddExp(e->loc, b, new IntegerExp(e->loc, v->offset, Type::tint32));
+#if IN_LLVM
+    // LLVMDC modification
+    // this is *essential*
+    ((AddExp*)b)->llvmFieldIndex = true;
+#endif
 	b->type = v->type->pointerTo();
 	e = new PtrExp(e->loc, b);
 	e->type = v->type;

dmd/statement.c

@@ -1437,7 +1437,7 @@ Statement *ForeachStatement::semantic(Scope *sc)
 		exps->push(aggr);
 		size_t keysize = taa->key->size();
 		keysize = (keysize + 3) & ~3;
-		exps->push(new IntegerExp(0, keysize, Type::tint32));
+		exps->push(new IntegerExp(0, keysize, Type::tsize_t));
 		exps->push(flde);
 		e = new CallExp(loc, ec, exps);
 		e->type = Type::tindex;	// don't run semantic() on e

dmd/statement.h

@@ -46,6 +46,7 @@ struct ScopeStatement;
 struct TryCatchStatement;
 struct HdrGenState;
 struct InterState;
+struct CaseStatement;
 
 enum TOK;
 
@@ -114,6 +115,7 @@ struct Statement : Object
     virtual CompoundStatement *isCompoundStatement() { return NULL; }
     virtual ReturnStatement *isReturnStatement() { return NULL; }
     virtual IfStatement *isIfStatement() { return NULL; }
+    virtual CaseStatement* isCaseStatement() { return NULL; }
 };
 
 struct ExpStatement : Statement
@@ -436,6 +438,8 @@ struct CaseStatement : Statement
     Statement *inlineScan(InlineScanState *iss);
 
     void toIR(IRState *irs);
+
+    CaseStatement* isCaseStatement() { return this; }
 };
 
 struct DefaultStatement : Statement