From 9f187b46ae761e8275362d6c1533e9fe79028c7b Mon Sep 17 00:00:00 2001
From: jsdelfino <jsdelfino@13f79535-47bb-0310-9956-ffa450edef68>
Date: Sun, 1 Nov 2009 05:24:54 +0000
Subject: Improved memory management using APR memory pools, changed frame
 allocation in eval library to support forward references and fixed memory
 leak in XML parsing code. Also simplified a bit the printing of lists to make
 them easier to read.

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@831639 13f79535-47bb-0310-9956-ffa450edef68
---
 cpp/sca/modules/eval/eval.hpp | 56 ++++++++++++++++++++++++-------------------
 1 file changed, 31 insertions(+), 25 deletions(-)

(limited to 'cpp/sca/modules/eval/eval.hpp')

diff --git a/cpp/sca/modules/eval/eval.hpp b/cpp/sca/modules/eval/eval.hpp
index 1496c3bd09..78051c5a2b 100644
--- a/cpp/sca/modules/eval/eval.hpp
+++ b/cpp/sca/modules/eval/eval.hpp
@@ -36,7 +36,7 @@
 namespace tuscany {
 namespace eval {
 
-const value evalApply(const value& exp, Env& env);
+const value evalExpr(const value& exp, Env& env, const gc_pool& pool);
 
 const value compoundProcedureSymbol("compound-procedure");
 const value procedureSymbol("procedure");
@@ -86,10 +86,10 @@ const list<value> operands(const value& exp) {
     return cdr((list<value> )exp);
 }
 
-const list<value> listOfValues(const list<value> exps, Env& env) {
+const list<value> listOfValues(const list<value> exps, Env& env, const gc_pool& pool) {
     if(isNil(exps))
         return list<value> ();
-    return cons(evalApply(car(exps), env), listOfValues(cdr(exps), env));
+    return cons(evalExpr(car(exps), env, pool), listOfValues(cdr(exps), env, pool));
 }
 
 const value applyOperat(const value& exp) {
@@ -132,19 +132,19 @@ const value makeBegin(const list<value> seq) {
     return cons(beginSymbol, seq);
 }
 
-const value evalSequence(const list<value>& exps, Env& env) {
+const value evalSequence(const list<value>& exps, Env& env, const gc_pool& pool) {
     if(isLastExp(exps))
-        return evalApply(firstExp(exps), env);
-    evalApply(firstExp(exps), env);
-    return evalSequence(restExp(exps), env);
+        return evalExpr(firstExp(exps), env, pool);
+    evalExpr(firstExp(exps), env, pool);
+    return evalSequence(restExp(exps), env, pool);
 }
 
-const value applyProcedure(const value& procedure, list<value>& arguments) {
+const value applyProcedure(const value& procedure, list<value>& arguments, const gc_pool& pool) {
     if(isPrimitiveProcedure(procedure))
         return applyPrimitiveProcedure(procedure, arguments);
     if(isCompoundProcedure(procedure)) {
-        Env env = extendEnvironment(procedureParameters(procedure), arguments, procedureEnvironment(procedure));
-        return evalSequence(procedureBody(procedure), env);
+        Env env = extendEnvironment(procedureParameters(procedure), arguments, procedureEnvironment(procedure), pool);
+        return evalSequence(procedureBody(procedure), env, pool);
     }
     std::cout << "Unknown procedure type " << procedure << "\n";
     return value();
@@ -218,46 +218,52 @@ value condToIf(const value& exp) {
     return expandClauses(condClauses(exp));
 }
 
-value evalIf(const value& exp, Env& env) {
-    if(isTrue(evalApply(ifPredicate(exp), env)))
-        return evalApply(ifConsequent(exp), env);
-    return evalApply(ifAlternative(exp), env);
+value evalIf(const value& exp, Env& env, const gc_pool& pool) {
+    if(isTrue(evalExpr(ifPredicate(exp), env, pool)))
+        return evalExpr(ifConsequent(exp), env, pool);
+    return evalExpr(ifAlternative(exp), env, pool);
 }
 
-const value evalDefinition(const value& exp, Env& env) {
-    defineVariable(definitionVariable(exp), evalApply(definitionValue(exp), env), env);
+const value evalDefinition(const value& exp, Env& env, const gc_pool& pool) {
+    defineVariable(definitionVariable(exp), evalExpr(definitionValue(exp), env, pool), env);
     return definitionVariable(exp);
 }
 
-const value evalApply(const value& exp, Env& env) {
+const value evalExpr(const value& exp, Env& env, const gc_pool& pool) {
     if(isSelfEvaluating(exp))
         return exp;
     if(isQuoted(exp))
         return textOfQuotation(exp);
     if(isDefinition(exp))
-        return evalDefinition(exp, env);
+        return evalDefinition(exp, env, pool);
     if(isIf(exp))
-        return evalIf(exp, env);
+        return evalIf(exp, env, pool);
     if(isBegin(exp))
-        return evalSequence(beginActions(exp), env);
+        return evalSequence(beginActions(exp), env, pool);
     if(isCond(exp))
-        return evalApply(condToIf(exp), env);
+        return evalExpr(condToIf(exp), env, pool);
     if(isLambda(exp))
         return makeProcedure(lambdaParameters(exp), lambdaBody(exp), env);
     if(isVariable(exp))
         return lookupVariableValue(exp, env);
     if(isApply(exp)) {
-        list<value> applyOperandValues = evalApply(applyOperand(exp), env);
-        return applyProcedure(evalApply(applyOperat(exp), env), applyOperandValues);
+        list<value> applyOperandValues = evalExpr(applyOperand(exp), env, pool);
+        return applyProcedure(evalExpr(applyOperat(exp), env, pool), applyOperandValues, pool);
     }
     if(isApplication(exp)) {
-        list<value> operandValues = listOfValues(operands(exp), env);
-        return applyProcedure(evalApply(operat(exp), env), operandValues);
+        list<value> operandValues = listOfValues(operands(exp), env, pool);
+        return applyProcedure(evalExpr(operat(exp), env, pool), operandValues, pool);
     }
     std::cout << "Unknown expression type " << exp << "\n";
     return value();
 }
 
+const list<value> quotedParameters(const list<value>& p) {
+    if (isNil(p))
+        return p;
+    return cons<value>(mklist<value>(quoteSymbol, car(p)), quotedParameters(cdr(p)));
+}
+
 }
 }
 #endif /* tuscany_eval_eval_hpp */
-- 
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