Reduce size of StructLiteralExp (#20779)

compiler/src/dmd/expression.d

@@ -301,8 +301,14 @@ extern (C++) abstract class Expression : ASTNode
 
     Loc loc;        // file location
     const EXP op;   // to minimize use of dynamic_cast
-    bool parens;    // if this is a parenthesized expression
+
-    bool rvalue;    // true if this is considered to be an rvalue, even if it is an lvalue
+    static struct BitFields
+    {
+        bool parens;    // if this is a parenthesized expression
+        bool rvalue;    // true if this is considered to be an rvalue, even if it is an lvalue
+    }
+    import dmd.common.bitfields;
+    mixin(generateBitFields!(BitFields, ubyte));
 
     extern (D) this(const ref Loc loc, EXP op) scope @safe
     {
@@ -2126,6 +2132,16 @@ extern (C++) final class AssocArrayLiteralExp : Expression
  */
 extern (C++) final class StructLiteralExp : Expression
 {
+    struct BitFields
+    {
+        bool useStaticInit;     /// if this is true, use the StructDeclaration's init symbol
+        bool isOriginal = false; /// used when moving instances to indicate `this is this.origin`
+        OwnedBy ownedByCtfe = OwnedBy.code;
+    }
+    import dmd.common.bitfields;
+    mixin(generateBitFields!(BitFields, ubyte));
+    StageFlags stageflags;
+
     StructDeclaration sd;   /// which aggregate this is for
     Expressions* elements;  /// parallels sd.fields[] with null entries for fields to skip
     Type stype;             /// final type of result (can be different from sd's type)
@@ -2163,11 +2179,6 @@ extern (C++) final class StructLiteralExp : Expression
         inlineScan        = 0x10, /// inlineScan is running
         toCBuffer         = 0x20 /// toCBuffer is running
     }
-    StageFlags stageflags;
-
-    bool useStaticInit;     /// if this is true, use the StructDeclaration's init symbol
-    bool isOriginal = false; /// used when moving instances to indicate `this is this.origin`
-    OwnedBy ownedByCtfe = OwnedBy.code;
 
     extern (D) this(const ref Loc loc, StructDeclaration sd, Expressions* elements, Type stype = null) @safe
     {

compiler/src/dmd/expression.h

@@ -77,8 +77,12 @@ public:
     Type *type;                 // !=NULL means that semantic() has been run
     Loc loc;                    // file location
     EXP op;                     // to minimize use of dynamic_cast
-    d_bool parens;              // if this is a parenthesized expression
+    uint8_t bitFields;
-    d_bool rvalue;              // consider this an rvalue, even if it is an lvalue
+
+    bool parens() const;
+    bool parens(bool v);
+    bool rvalue() const;
+    bool rvalue(bool v);
 
     size_t size() const;
     static void _init();
@@ -431,6 +435,24 @@ public:
 class StructLiteralExp final : public Expression
 {
 public:
+    uint8_t bitFields;
+
+    // if this is true, use the StructDeclaration's init symbol
+    bool useStaticInit() const;
+    bool useStaticInit(bool v);
+    // used when moving instances to indicate `this is this.origin`
+    bool isOriginal() const;
+    bool isOriginal(bool v);
+    OwnedBy ownedByCtfe() const;
+    OwnedBy ownedByCtfe(OwnedBy v);
+
+    /** anytime when recursive function is calling, 'stageflags' marks with bit flag of
+     * current stage and unmarks before return from this function.
+     * 'inlinecopy' uses similar 'stageflags' and from multiple evaluation 'doInline'
+     * (with infinite recursion) of this expression.
+     */
+    uint8_t stageflags;
+
     StructDeclaration *sd;      // which aggregate this is for
     Expressions *elements;      // parallels sd->fields[] with NULL entries for fields to skip
     Type *stype;                // final type of result (can be different from sd's type)
@@ -451,17 +473,6 @@ public:
     StructLiteralExp *origin;
 
 
-    /** anytime when recursive function is calling, 'stageflags' marks with bit flag of
-     * current stage and unmarks before return from this function.
-     * 'inlinecopy' uses similar 'stageflags' and from multiple evaluation 'doInline'
-     * (with infinite recursion) of this expression.
-     */
-    uint8_t stageflags;
-
-    d_bool useStaticInit;         // if this is true, use the StructDeclaration's init symbol
-    d_bool isOriginal;            // used when moving instances to indicate `this is this.origin`
-    OwnedBy ownedByCtfe;
-
     static StructLiteralExp *create(const Loc &loc, StructDeclaration *sd, void *elements, Type *stype = nullptr);
     bool equals(const RootObject * const o) const override;
     StructLiteralExp *syntaxCopy() override;

compiler/src/dmd/frontend.h

@@ -2206,8 +2206,28 @@ public:
     Type* type;
     Loc loc;
     const EXP op;
-    bool parens;
+    struct BitFields final
-    bool rvalue;
+    {
+        bool parens;
+        bool rvalue;
+        BitFields() :
+            parens(),
+            rvalue()
+        {
+        }
+        BitFields(bool parens, bool rvalue = false) :
+            parens(parens),
+            rvalue(rvalue)
+            {}
+    };
+
+    bool parens() const;
+    bool parens(bool v);
+    bool rvalue() const;
+    bool rvalue(bool v);
+private:
+    uint8_t bitFields;
+public:
     size_t size() const;
     static void _init();
     static void deinitialize();
@@ -3450,6 +3470,34 @@ public:
 class StructLiteralExp final : public Expression
 {
 public:
+    struct BitFields final
+    {
+        bool useStaticInit;
+        bool isOriginal;
+        OwnedBy ownedByCtfe;
+        BitFields() :
+            useStaticInit(),
+            isOriginal(false),
+            ownedByCtfe((OwnedBy)0u)
+        {
+        }
+        BitFields(bool useStaticInit, bool isOriginal = false, OwnedBy ownedByCtfe = (OwnedBy)0u) :
+            useStaticInit(useStaticInit),
+            isOriginal(isOriginal),
+            ownedByCtfe(ownedByCtfe)
+            {}
+    };
+
+    bool useStaticInit() const;
+    bool useStaticInit(bool v);
+    bool isOriginal() const;
+    bool isOriginal(bool v);
+    OwnedBy ownedByCtfe() const;
+    OwnedBy ownedByCtfe(OwnedBy v);
+private:
+    uint8_t bitFields;
+public:
+    StageFlags stageflags;
     StructDeclaration* sd;
     Array<Expression* >* elements;
     Type* stype;
@@ -3470,10 +3518,6 @@ public:
         toCBuffer = 32u,
     };
 
-    StageFlags stageflags;
-    bool useStaticInit;
-    bool isOriginal;
-    OwnedBy ownedByCtfe;
     static StructLiteralExp* create(const Loc& loc, StructDeclaration* sd, void* elements, Type* stype = nullptr);
     bool equals(const RootObject* const o) const override;
     StructLiteralExp* syntaxCopy() override;
@@ -5358,18 +5402,18 @@ struct UnionExp final
 private:
     union _AnonStruct_u
     {
-        char exp[31LLU];
+        char exp[30LLU];
         char integerexp[40LLU];
-        char errorexp[31LLU];
+        char errorexp[30LLU];
         char realexp[48LLU];
         char complexexp[64LLU];
         char symoffexp[64LLU];
-        char stringexp[59LLU];
+        char stringexp[51LLU];
-        char arrayliteralexp[56LLU];
+        char arrayliteralexp[48LLU];
         char assocarrayliteralexp[56LLU];
-        char structliteralexp[76LLU];
+        char structliteralexp[72LLU];
         char compoundliteralexp[40LLU];
-        char nullexp[31LLU];
+        char nullexp[30LLU];
         char dotvarexp[49LLU];
         char addrexp[40LLU];
         char indexexp[58LLU];