From cf5376c18d8e4d6b3ed2d7b341279cf65fc16418 Mon Sep 17 00:00:00 2001
From: Andrew Reynolds <andrew.j.reynolds@gmail.com>
Date: Tue, 17 Aug 2021 12:07:00 -0500
Subject: Fix policy for eliminating quantified formulas (#7017)

This also consolidates the option strictTriggers into userPatMode.

Fixes #6996.
---
 src/theory/quantifiers/ematching/inst_strategy_e_matching.cpp |  5 ++++-
 src/theory/quantifiers/ematching/instantiation_engine.cpp     | 10 +++++++---
 src/theory/quantifiers/quantifiers_attributes.cpp             |  3 +--
 src/theory/quantifiers/quantifiers_attributes.h               |  3 +--
 src/theory/quantifiers/quantifiers_rewriter.cpp               |  2 +-
 5 files changed, 14 insertions(+), 9 deletions(-)

(limited to 'src/theory')

diff --git a/src/theory/quantifiers/ematching/inst_strategy_e_matching.cpp b/src/theory/quantifiers/ematching/inst_strategy_e_matching.cpp
index ab237fc6c..8901ec314 100644
--- a/src/theory/quantifiers/ematching/inst_strategy_e_matching.cpp
+++ b/src/theory/quantifiers/ematching/inst_strategy_e_matching.cpp
@@ -111,7 +111,10 @@ InstStrategyStatus InstStrategyAutoGenTriggers::process(Node f,
                                                         int e)
 {
   options::UserPatMode upMode = getInstUserPatMode();
-  if (hasUserPatterns(f) && upMode == options::UserPatMode::TRUST)
+  // we don't auto-generate triggers if the mode is trust or strict
+  if (hasUserPatterns(f)
+      && (upMode == options::UserPatMode::TRUST
+          || upMode == options::UserPatMode::STRICT))
   {
     return InstStrategyStatus::STATUS_UNKNOWN;
   }
diff --git a/src/theory/quantifiers/ematching/instantiation_engine.cpp b/src/theory/quantifiers/ematching/instantiation_engine.cpp
index d490dce83..d9bec820c 100644
--- a/src/theory/quantifiers/ematching/instantiation_engine.cpp
+++ b/src/theory/quantifiers/ematching/instantiation_engine.cpp
@@ -200,11 +200,15 @@ bool InstantiationEngine::checkCompleteFor( Node q ) {
 
 void InstantiationEngine::checkOwnership(Node q)
 {
-  if( options::strictTriggers() && q.getNumChildren()==3 ){
+  if (options::userPatternsQuant() == options::UserPatMode::STRICT
+      && q.getNumChildren() == 3)
+  {
     //if strict triggers, take ownership of this quantified formula
     bool hasPat = false;
-    for( unsigned i=0; i<q[2].getNumChildren(); i++ ){
-      if( q[2][i].getKind()==INST_PATTERN || q[2][i].getKind()==INST_NO_PATTERN  ){
+    for (const Node& qc : q)
+    {
+      if (qc.getKind() == INST_PATTERN || qc.getKind() == INST_NO_PATTERN)
+      {
         hasPat = true;
         break;
       }
diff --git a/src/theory/quantifiers/quantifiers_attributes.cpp b/src/theory/quantifiers/quantifiers_attributes.cpp
index 1abbd1989..33ed6f536 100644
--- a/src/theory/quantifiers/quantifiers_attributes.cpp
+++ b/src/theory/quantifiers/quantifiers_attributes.cpp
@@ -30,8 +30,7 @@ namespace quantifiers {
 
 bool QAttributes::isStandard() const
 {
-  return !d_sygus && !d_quant_elim && !isFunDef() && d_name.isNull()
-         && !d_isInternal;
+  return !d_sygus && !d_quant_elim && !isFunDef() && !d_isInternal;
 }
 
 QuantAttributes::QuantAttributes() {}
diff --git a/src/theory/quantifiers/quantifiers_attributes.h b/src/theory/quantifiers/quantifiers_attributes.h
index b3fdd09da..910dbab5b 100644
--- a/src/theory/quantifiers/quantifiers_attributes.h
+++ b/src/theory/quantifiers/quantifiers_attributes.h
@@ -162,8 +162,7 @@ struct QAttributes
    * perform destructive updates (variable elimination, miniscoping, etc).
    *
    * A quantified formula is not standard if it is sygus, one for which
-   * we are performing quantifier elimination, is a function definition, or
-   * has a name.
+   * we are performing quantifier elimination, or is a function definition.
    */
   bool isStandard() const;
 };
diff --git a/src/theory/quantifiers/quantifiers_rewriter.cpp b/src/theory/quantifiers/quantifiers_rewriter.cpp
index 48106b858..aba2d79bf 100644
--- a/src/theory/quantifiers/quantifiers_rewriter.cpp
+++ b/src/theory/quantifiers/quantifiers_rewriter.cpp
@@ -1797,7 +1797,7 @@ bool QuantifiersRewriter::doOperation(Node q,
 {
   bool is_strict_trigger =
       qa.d_hasPattern
-      && options::userPatternsQuant() == options::UserPatMode::TRUST;
+      && options::userPatternsQuant() == options::UserPatMode::STRICT;
   bool is_std = qa.isStandard() && !is_strict_trigger;
   if (computeOption == COMPUTE_ELIM_SYMBOLS)
   {
-- 
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