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Bug 479638 - Cache the result of EvalBinding.isConstantExpression()

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This helps avoid infinite recursion when a variable's initializer
references itself.

Change-Id: I4667536ebbefd2008afe9003617092a0a5693db0
Signed-off-by: Nathan Ridge <zeratul976@hotmail.com>
This commit is contained in:
Nathan Ridge 2015-11-26 14:43:50 -05:00 committed by Gerrit Code Review @ Eclipse.org
parent 56635a1b57
commit 5cd555717b
2 changed files with 22 additions and 2 deletions
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12
codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/core/internal/checkers/ReturnCheckerTest.java
View file

@ -417,7 +417,17 @@ public class ReturnCheckerTest extends CheckerTestCase {
// }
public void testSelfReferencingVariable_452325() throws Exception {
// Just check that codan runs without any exceptions being thrown.
checkSampleAbove();
checkSampleAboveCpp();
}
// int bar(int x) { return x; }
// int foo() { // error
// int waldo = bar(waldo);
// if (bar(waldo));
// }
public void testSelfReferencingVariable_479638() throws Exception {
// Just check that codan runs without any exceptions being thrown.
checkSampleAboveCpp();
}
// int foo(int x) { // error

12
core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/EvalBinding.java
View file

@ -70,8 +70,10 @@ public class EvalBinding extends CPPDependentEvaluation {
private IType fType;
private boolean fCheckedIsValueDependent;
private boolean fIsValueDependent;
private boolean fIsTypeDependent;
private boolean fCheckedIsTypeDependent;
private boolean fIsTypeDependent;
private boolean fCheckedIsConstantExpression;
private boolean fIsConstantExpression;
public EvalBinding(IBinding binding, IType type, IASTNode pointOfDefinition) {
this(binding, type, findEnclosingTemplate(pointOfDefinition));
@ -240,6 +242,14 @@ public class EvalBinding extends CPPDependentEvaluation {
@Override
public boolean isConstantExpression(IASTNode point) {
if (!fCheckedIsConstantExpression) {
fCheckedIsConstantExpression = true;
fIsConstantExpression = computeIsConstantExpression(point);
}
return fIsConstantExpression;
}
private boolean computeIsConstantExpression(IASTNode point) {
return fBinding instanceof IEnumerator
|| fBinding instanceof ICPPFunction
|| (fBinding instanceof IVariable && isConstexprValue(((IVariable) fBinding).getInitialValue(), point));