Changeset 849720f for src/SynTree

Timestamp:

Sep 23, 2019, 4:59:33 PM (5 years ago)

Author:

Andrew Beach <ajbeach@…>

Branches:

ADT, arm-eh, ast-experimental, enum, forall-pointer-decay, jacob/cs343-translation, jenkins-sandbox, master, new-ast, new-ast-unique-expr, pthread-emulation, qualifiedEnum

Children:

4a60488, b4f8808

Parents:

abec2f8

Message:

lvalue should now always come directly from the expression.

Location:

src/SynTree

Files:

• ApplicationExpr.cc (modified) (2 diffs)
• CommaExpr.cc (modified) (1 diff)
• Expression.cc (modified) (11 diffs)
• Expression.h (modified) (1 diff)
• TupleExpr.cc (modified) (2 diffs)

src/SynTree/ApplicationExpr.cc

@@ -25 +25 @@
 #include "Declaration.h"         // for Declaration
 #include "Expression.h"          // for ParamEntry, ApplicationExpr, Expression
+#include "InitTweak/InitTweak.h" // for getFunction
 #include "ResolvExpr/typeops.h"  // for extractResultType
 #include "Type.h"                // for Type, PointerType, FunctionType
@@ -77 +78 @@
 
 bool ApplicationExpr::get_lvalue() const {
-        return result->get_lvalue();
+        // from src/GenPoly/Lvalue.cc: isIntrinsicReference
+        static std::set<std::string> lvalueFunctions = { "*?", "?[?]" };
+        if ( const DeclarationWithType * func = InitTweak::getFunction( this ) ) {
+                return func->linkage == LinkageSpec::Intrinsic && lvalueFunctions.count(func->name);
+        }
+        return false;
 }
 

src/SynTree/CommaExpr.cc

@@ -40 +40 @@
 
 bool CommaExpr::get_lvalue() const {
-        // xxx - as above, shouldn't be an lvalue but that information is used anyways.
-        return result->get_lvalue();
+        // This is wrong by C, but the current implementation uses it.
+        return arg2->get_lvalue();
 }
 

src/SynTree/Expression.cc

@@ -19 +19 @@
 #include <iostream>                  // for ostream, operator<<, basic_ostream
 #include <list>                      // for list, _List_iterator, list<>::co...
+#include <set>                       // for set
 
 #include "Common/utility.h"          // for maybeClone, cloneAll, deleteAll
@@ -64 +65 @@
 
 bool Expression::get_lvalue() const {
-        assert( !result->get_lvalue() );
         return false;
 }
@@ -140 +140 @@
 
 bool VariableExpr::get_lvalue() const {
-        return result->get_lvalue();
+        // It isn't always an lvalue, but it is never an rvalue.
+        return true;
 }
 
@@ -277 +278 @@
 
 bool CastExpr::get_lvalue() const {
-        return result->get_lvalue();
+        // This is actually wrong by C, but it works with our current set-up.
+        return arg->get_lvalue();
 }
 
@@ -360 +362 @@
 }
 
+bool UntypedMemberExpr::get_lvalue() const {
+        return aggregate->get_lvalue();
+}
+
 void UntypedMemberExpr::print( std::ostream & os, Indenter indent ) const {
         os << "Untyped Member Expression, with field: " << std::endl << indent+1;
@@ -392 +398 @@
 
 bool MemberExpr::get_lvalue() const {
-        assert( result->get_lvalue() );
+        // This is actually wrong by C, but it works with our current set-up.
         return true;
 }
@@ -447 +453 @@
 
 bool UntypedExpr::get_lvalue() const {
-        return result->get_lvalue();
+        // from src/GenPoly/Lvalue.cc: isIntrinsicReference
+        static std::set<std::string> lvalueFunctions = { "*?", "?[?]" };
+        std::string fname = InitTweak::getFunctionName( const_cast< UntypedExpr * >( this ) );
+        return lvalueFunctions.count(fname);
 }
 
@@ -510 +519 @@
 
 bool ConditionalExpr::get_lvalue() const {
-        return result->get_lvalue();
+        return false;
 }
 
@@ -570 +579 @@
 
 bool ConstructorExpr::get_lvalue() const {
-        return result->get_lvalue();
+        return false;
 }
 
@@ -593 +602 @@
 
 bool CompoundLiteralExpr::get_lvalue() const {
-        assert( result->get_lvalue() );
         return true;
 }
@@ -648 +656 @@
 }
 bool StmtExpr::get_lvalue() const {
-        return result->get_lvalue();
+        return false;
 }
 void StmtExpr::print( std::ostream & os, Indenter indent ) const {

src/SynTree/Expression.h

@@ -275 +275 @@
         virtual ~UntypedMemberExpr();
 
+        bool get_lvalue() const final;
+
         Expression * get_member() const { return member; }
         void set_member( Expression * newValue ) { member = newValue; }

src/SynTree/TupleExpr.cc

@@ -58 +58 @@
 
 bool TupleExpr::get_lvalue() const {
-        return result->get_lvalue();
+        return false;
 }
 
@@ -83 +83 @@
 
 bool TupleIndexExpr::get_lvalue() const {
-        assert( result->get_lvalue() );
-        return true;
+        return tuple->get_lvalue();
 }