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make the switch an ENV not property.

This commit is contained in:
parrt 2016-11-24 20:30:18 -08:00
parent e1a1867149
commit 933cc6e63c
1 changed files with 4 additions and 1 deletions
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5
runtime/Java/src/org/antlr/v4/runtime/atn/ParserATNSimulator.java
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@ -293,7 +293,8 @@ public class ParserATNSimulator extends ATNSimulator {
public static final boolean dfa_debug = false; public static final boolean dfa_debug = false;
public static final boolean retry_debug = false; public static final boolean retry_debug = false;
public static final boolean TURN_OFF_LR_LOOP_ENTRY_BRANCH_OPT = Boolean.parseBoolean(System.getProperty("TURN_OFF_LR_LOOP_ENTRY_BRANCH_OPT")); /** Just in case this optimization is bad, add an ENV variable to turn it off */
public static final boolean TURN_OFF_LR_LOOP_ENTRY_BRANCH_OPT = Boolean.parseBoolean(System.getenv("TURN_OFF_LR_LOOP_ENTRY_BRANCH_OPT"));
protected final Parser parser; protected final Parser parser;
@ -1694,6 +1695,8 @@ public class ParserATNSimulator extends ATNSimulator {
* making a decision in stat seeing through expr. It is only when * making a decision in stat seeing through expr. It is only when
* parsing rule expr that we must use the precedence to get the * parsing rule expr that we must use the precedence to get the
* right interpretation and, hence, parse tree. * right interpretation and, hence, parse tree.
*
* @since 4.6
*/ */
protected boolean canDropLoopEntryEdgeInLeftRecursiveRule(ATNConfig config) { protected boolean canDropLoopEntryEdgeInLeftRecursiveRule(ATNConfig config) {
if ( TURN_OFF_LR_LOOP_ENTRY_BRANCH_OPT ) return false; if ( TURN_OFF_LR_LOOP_ENTRY_BRANCH_OPT ) return false;