fix Issue 9279 - Static array return value implicitly converted to im…

…mutable dynamic array

src/escape.c

@@ -153,16 +153,9 @@ bool checkEscape(Scope *sc, Expression *e, bool gag)
         {
             Type *tb = e->type->toBasetype();
             if (tb->ty == Tarray &&
-                e->e1->op == TOKvar &&
                 e->e1->type->toBasetype()->ty == Tsarray)
             {
-                VarExp *ve = (VarExp *)e->e1;
-                VarDeclaration *v = ve->var->isVarDeclaration();
-                if (v && v->toParent2() == sc->func)
-                {
-                    if (!v->isDataseg() && !v->isParameter())
-                        error(e->loc, "escaping reference to local %s", v);
-                }
+                result |= checkEscapeRef(sc, e->e1, gag);
             }
         }
 
@@ -252,10 +245,10 @@ bool checkEscapeRef(Scope *sc, Expression *e, bool gag)
         {
         }
 
-        void error(Loc loc, const char *format, Dsymbol *s)
+        void error(Loc loc, const char *format, RootObject *o)
         {
             if (!gag)
-                ::error(loc, format, s->toChars());
+                ::error(loc, format, o->toChars());
             result = true;
         }
 
@@ -399,15 +392,12 @@ bool checkEscapeRef(Scope *sc, Expression *e, bool gag)
             Type *t1 = e->e1->type->toBasetype();
             TypeFunction *tf;
             if (t1->ty == Tdelegate)
-            {
                 tf = (TypeFunction *)((TypeDelegate *)t1)->next;
-                assert(tf->ty == Tfunction);
-            }
             else if (t1->ty == Tfunction)
                 tf = (TypeFunction *)t1;
             else
-                tf = NULL;
-            if (tf && tf->isref)
+                return;
+            if (tf->isref)
             {
                 if (e->arguments && e->arguments->dim)
                 {
@@ -436,6 +426,11 @@ bool checkEscapeRef(Scope *sc, Expression *e, bool gag)
                     dve->e1->accept(this);
                 }
             }
+            else
+            {
+                error(e->loc, "escaping reference to stack allocated value returned by %s", e);
+                return;
+            }
         }
     };
     EscapeRefVisitor v(sc, gag);

src/magicport.json

@@ -3166,6 +3166,7 @@
                 "declaration",
                 "func",
                 "mtype",
+                "root.rootobject",
                 "tokens",
                 "errors",
                 "init"

test/fail_compilation/fail1313a.d

@@ -1,7 +1,7 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail1313a.d(13): Error: escaping reference to local a
+fail_compilation/fail1313a.d(13): Error: escaping reference to local variable a
 ---
 */
 

test/fail_compilation/fail1313b.d

@@ -1,7 +1,7 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail1313b.d(13): Error: escaping reference to local a
+fail_compilation/fail1313b.d(13): Error: escaping reference to local variable a
 ---
 */
 

test/fail_compilation/fail13902.d

@@ -128,14 +128,64 @@ int* testEscape3(
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail13902.d(151): Error: escaping reference to local variable x
-fail_compilation/fail13902.d(152): Error: escaping reference to local variable s1
-fail_compilation/fail13902.d(156): Error: escaping reference to local variable sa1
+fail_compilation/fail13902.d(150): Error: escaping reference to local variable sa1
+fail_compilation/fail13902.d(151): Error: escaping reference to local variable sa1
+fail_compilation/fail13902.d(152): Error: escaping reference to local variable sa1
+fail_compilation/fail13902.d(155): Error: escaping reference to local variable sa2
+fail_compilation/fail13902.d(156): Error: escaping reference to local variable sa2
 fail_compilation/fail13902.d(157): Error: escaping reference to local variable sa2
-fail_compilation/fail13902.d(158): Error: escaping reference to local variable x
-fail_compilation/fail13902.d(159): Error: escaping reference to local variable x
-fail_compilation/fail13902.d(160): Error: escaping reference to local variable s1
-fail_compilation/fail13902.d(161): Error: escaping reference to local variable s1
+fail_compilation/fail13902.d(161): Error: escaping reference to local variable s
+fail_compilation/fail13902.d(162): Error: escaping reference to local variable s
+fail_compilation/fail13902.d(163): Error: escaping reference to local variable s
+fail_compilation/fail13902.d(166): Error: escaping reference to stack allocated value returned by makeSA()
+fail_compilation/fail13902.d(167): Error: escaping reference to stack allocated value returned by makeSA()
+fail_compilation/fail13902.d(168): Error: escaping reference to stack allocated value returned by makeSA()
+fail_compilation/fail13902.d(171): Error: escaping reference to stack allocated value returned by makeS()
+fail_compilation/fail13902.d(172): Error: escaping reference to stack allocated value returned by makeS()
+fail_compilation/fail13902.d(173): Error: escaping reference to stack allocated value returned by makeS()
+---
+*/
+int[] testEscape4(int[3] sa1)       // Bugzilla 9279
+{
+    if (0) return sa1;                      // error <- no error
+    if (0) return cast(int[])sa1;           // error <- no error
+    if (0) return sa1[];                    // error
+
+    int[3] sa2;
+    if (0) return sa2;                      // error
+    if (0) return cast(int[])sa2;           // error
+    if (0) return sa2[];                    // error
+
+    struct S { int[3] sa; }
+    S s;
+    if (0) return s.sa;                     // error <- no error
+    if (0) return cast(int[])s.sa;          // error <- no error
+    if (0) return s.sa[];                   // error
+
+    int[3] makeSA() { int[3] ret; return ret; }
+    if (0) return makeSA();                 // error <- no error
+    if (0) return cast(int[])makeSA();      // error <- no error
+    if (0) return makeSA()[];               // error <- no error
+
+    S makeS() { S s; return s; }
+    if (0) return makeS().sa;               // error <- no error
+    if (0) return cast(int[])makeS().sa;    // error <- no error
+    if (0) return makeS().sa[];             // error <- no error
+
+    return null;
+}
+
+/*
+TEST_OUTPUT:
+---
+fail_compilation/fail13902.d(201): Error: escaping reference to local variable x
+fail_compilation/fail13902.d(202): Error: escaping reference to local variable s1
+fail_compilation/fail13902.d(206): Error: escaping reference to local variable sa1
+fail_compilation/fail13902.d(207): Error: escaping reference to local variable sa2
+fail_compilation/fail13902.d(208): Error: escaping reference to local variable x
+fail_compilation/fail13902.d(209): Error: escaping reference to local variable x
+fail_compilation/fail13902.d(210): Error: escaping reference to local variable s1
+fail_compilation/fail13902.d(211): Error: escaping reference to local variable s1
 ---
 */
 ref int testEscapeRef1()
@@ -167,14 +217,14 @@ ref int testEscapeRef1()
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail13902.d(190): Error: escaping reference to local variable x
-fail_compilation/fail13902.d(191): Error: escaping reference to local variable s1
-fail_compilation/fail13902.d(195): Error: escaping reference to local variable sa1
-fail_compilation/fail13902.d(196): Error: escaping reference to local variable sa2
-fail_compilation/fail13902.d(197): Error: escaping reference to local variable x
-fail_compilation/fail13902.d(198): Error: escaping reference to local variable x
-fail_compilation/fail13902.d(199): Error: escaping reference to local variable s1
-fail_compilation/fail13902.d(200): Error: escaping reference to local variable s1
+fail_compilation/fail13902.d(240): Error: escaping reference to local variable x
+fail_compilation/fail13902.d(241): Error: escaping reference to local variable s1
+fail_compilation/fail13902.d(245): Error: escaping reference to local variable sa1
+fail_compilation/fail13902.d(246): Error: escaping reference to local variable sa2
+fail_compilation/fail13902.d(247): Error: escaping reference to local variable x
+fail_compilation/fail13902.d(248): Error: escaping reference to local variable x
+fail_compilation/fail13902.d(249): Error: escaping reference to local variable s1
+fail_compilation/fail13902.d(250): Error: escaping reference to local variable s1
 ---
 */
 ref int testEscapeRef2(
@@ -237,8 +287,8 @@ ref int testEscapeRef2(
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail13902.d(244): Error: escaping reference to local x
-fail_compilation/fail13902.d(245): Error: escaping reference to local x
+fail_compilation/fail13902.d(294): Error: escaping reference to local x
+fail_compilation/fail13902.d(295): Error: escaping reference to local x
 ---
 */
 int*[]  testArrayLiteral1() { int x; return [&x]; }
@@ -247,8 +297,8 @@ int*[1] testArrayLiteral2() { int x; return [&x]; }
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail13902.d(254): Error: escaping reference to local x
-fail_compilation/fail13902.d(255): Error: escaping reference to local x
+fail_compilation/fail13902.d(304): Error: escaping reference to local x
+fail_compilation/fail13902.d(305): Error: escaping reference to local x
 ---
 */
 S2  testStructLiteral1() { int x; return     S2(&x); }
@@ -257,8 +307,8 @@ S2* testStructLiteral2() { int x; return new S2(&x); }
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail13902.d(264): Error: escaping reference to local variable sa
-fail_compilation/fail13902.d(265): Error: escaping reference to local variable sa
+fail_compilation/fail13902.d(314): Error: escaping reference to local variable sa
+fail_compilation/fail13902.d(315): Error: escaping reference to local variable sa
 ---
 */
 int[] testSlice1() { int[3] sa; return sa[]; }
@@ -267,8 +317,8 @@ int[] testSlice2() { int[3] sa; int n; return sa[n..2][1..2]; }
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail13902.d(274): Error: escaping reference to the payload of variadic parameter vda
-fail_compilation/fail13902.d(275): Error: escaping reference to the payload of variadic parameter vda
+fail_compilation/fail13902.d(324): Error: escaping reference to the payload of variadic parameter vda
+fail_compilation/fail13902.d(325): Error: escaping reference to the payload of variadic parameter vda
 ---
 */
 ref int testDynamicArrayVariadic1(int[] vda...) { return vda[0]; }
@@ -278,8 +328,8 @@ int[3]  testDynamicArrayVariadic3(int[] vda...) { return vda[0..3]; }   // no er
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail13902.d(285): Error: escaping reference to the payload of variadic parameter vsa
-fail_compilation/fail13902.d(286): Error: escaping reference to the payload of variadic parameter vsa
+fail_compilation/fail13902.d(335): Error: escaping reference to the payload of variadic parameter vsa
+fail_compilation/fail13902.d(336): Error: escaping reference to the payload of variadic parameter vsa
 ---
 */
 ref int testStaticArrayVariadic1(int[3] vsa...) { return vsa[0]; }

test/fail_compilation/fail140.d

@@ -1,7 +1,7 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail140.d(11): Error: escaping reference to local string
+fail_compilation/fail140.d(11): Error: escaping reference to local variable string
 ---
 */
 

test/fail_compilation/fail9279.d

@@ -0,0 +1,13 @@
+/*
+TEST_OUTPUT:
+---
+fail_compilation/fail9279.d(10): Error: escaping reference to stack allocated value returned by b()
+fail_compilation/fail9279.d(13): Error: escaping reference to stack allocated value returned by getArr()
+---
+*/
+
+char[2] b()() { char[2] ret; return ret; }
+string a() { return b(); }
+
+char[12] getArr() { return "Hello World!"; }
+string getString() { return getArr(); }

test/runnable/test34.d

@@ -49,7 +49,7 @@ struct Struct
 {
     int langID;
     long _force_nrvo;
-}       
+}
 
 Struct[1] table;
 
@@ -107,11 +107,11 @@ void test4()
 /************************************************/
 
 int status5;
- 
+
 struct MyStruct5
 {
 }
- 
+
 void rec5(int i, MyStruct5 s)
 {
     if( i > 0 )
@@ -120,7 +120,7 @@ void rec5(int i, MyStruct5 s)
 	rec5(i-1, s);
     }
 }
- 
+
 void test5()
 {
     assert(status5==0);
@@ -379,7 +379,7 @@ void test17()
     S17!(int).iterator i;
     auto x = insert17(a, i);
     assert(x == 3);
-} 
+}
 
 /************************************************/
 
@@ -619,7 +619,7 @@ class RangeCoder
     }
 
     void encode(uint symbol) {
-	uint total = cumCount[$ - 1];              
+	uint total = cumCount[$ - 1];
 	// "Error: Access Violation" in following line
 	upper = lower + cast(uint)((cumCount[symbol+1] * range) / total) - 1;
 	lower = lower + cast(uint)((cumCount[symbol]   * range) / total);
@@ -687,7 +687,7 @@ class Foo34
 }
 
 void test34()
-{   
+{
     Foo34 f = new Foo34();
     f.foo();
 }
@@ -797,7 +797,7 @@ void test39()
 
 /************************************************/
 
-void test40() 
+void test40()
 {
     int[char] x;
     x['b'] = 123;
@@ -1003,14 +1003,6 @@ void test49()
 
 /************************************************/
 
-int[] foo50(int[2] x) { return x; }
-
-void test50()
-{
-}
-
-/************************************************/
-
 struct S51
 {
     int i = 3;
@@ -1026,12 +1018,12 @@ void test51()
 
 void test52()
 {
-    struct Foo {  
+    struct Foo {
 	alias int Y;
-    }  
+    }
     with (Foo) {
-         Y y;  
-    }  
+         Y y;
+    }
 }
 
 /************************************************/
@@ -1284,7 +1276,6 @@ void main()
     test47();
     test48();
     test49();
-    test50();
     test51();
     test52();
     test53();