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HEAD
Added minimum size analysis.
[repair.git]
/
Repair
/
RepairCompiler
/
MCC
/
IR
/
SymbolTableStack.java
1
package MCC.IR;
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import java.util.*;
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public class SymbolTableStack {
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SymbolTable st;
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SymbolTableStack() {
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st = null;
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}
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SymbolTableStack(SymbolTable st) {
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this.st = st;
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}
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boolean empty() {
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return st == null;
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}
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SymbolTable peek() {
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return st;
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}
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SymbolTable pop() {
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if (st == null) {
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throw new IRException("SymbolTableStack: tried to pop empty stack.");
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}
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SymbolTable lastst = st;
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st = st.getParent();
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return lastst;
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}
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// Link and push.
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void push(SymbolTable st) {
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if (st != null) {
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st.setParent(this.st);
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}
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this.st = st;
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}
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}