From 222e2a7620e6520ffaf4fc4e69d79c18da31542e Mon Sep 17 00:00:00 2001
From: "Zancanaro; Carlo" <czan8762@plang3.cs.usyd.edu.au>
Date: Mon, 24 Sep 2012 09:58:17 +1000
Subject: Add the clang library to the repo (with some of my changes, too).

---
 clang/test/SemaCXX/c99-variable-length-array.cpp | 141 +++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 clang/test/SemaCXX/c99-variable-length-array.cpp

(limited to 'clang/test/SemaCXX/c99-variable-length-array.cpp')

diff --git a/clang/test/SemaCXX/c99-variable-length-array.cpp b/clang/test/SemaCXX/c99-variable-length-array.cpp
new file mode 100644
index 0000000..7773c08
--- /dev/null
+++ b/clang/test/SemaCXX/c99-variable-length-array.cpp
@@ -0,0 +1,141 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -Wvla %s
+struct NonPOD {
+  NonPOD();
+};
+
+struct NonPOD2 {
+  NonPOD np;
+};
+
+struct POD {
+  int x;
+  int y;
+};
+
+// We allow VLAs of POD types, only.
+void vla(int N) {
+  int array1[N]; // expected-warning{{variable length arrays are a C99 feature}}
+  POD array2[N]; // expected-warning{{variable length arrays are a C99 feature}}
+  NonPOD array3[N]; // expected-error{{variable length array of non-POD element type 'NonPOD'}}
+  NonPOD2 array4[N][3]; // expected-error{{variable length array of non-POD element type 'NonPOD2'}}
+}
+
+/// Warn about VLAs in templates.
+template<typename T>
+void vla_in_template(int N, T t) {
+  int array1[N]; // expected-warning{{variable length arrays are a C99 feature}}
+}
+
+struct HasConstantValue {
+  static const unsigned int value = 2;
+};
+
+struct HasNonConstantValue {
+  static unsigned int value;
+};
+
+template<typename T>
+void vla_in_template(T t) {
+  int array2[T::value]; // expected-warning{{variable length arrays are a C99 feature}}
+}
+
+template void vla_in_template<HasConstantValue>(HasConstantValue);
+template void vla_in_template<HasNonConstantValue>(HasNonConstantValue); // expected-note{{instantiation of}}
+
+template<typename T> struct X0 { };
+
+// Cannot use any variably-modified type with a template parameter or
+// argument.
+void inst_with_vla(int N) {
+  int array[N]; // expected-warning{{variable length arrays are a C99 feature}}
+  X0<__typeof__(array)> x0a; // expected-error{{variably modified type 'typeof (array)' (aka 'int [N]') cannot be used as a template argument}}
+}
+
+template<typename T>
+struct X1 {
+  template<int (&Array)[T::value]> // expected-error{{non-type template parameter of variably modified type 'int (&)[HasNonConstantValue::value]'}}  \
+  // expected-warning{{variable length arrays are a C99 feature}}
+  struct Inner {
+    
+  };
+};
+
+X1<HasConstantValue> x1a;
+X1<HasNonConstantValue> x1b; // expected-note{{in instantiation of}}
+
+// Template argument deduction does not allow deducing a size from a VLA.
+template<typename T, unsigned N>
+void accept_array(T (&array)[N]); // expected-note{{candidate template ignored: failed template argument deduction}}
+
+void test_accept_array(int N) {
+  int array[N]; // expected-warning{{variable length arrays are a C99 feature}}
+  accept_array(array); // expected-error{{no matching function for call to 'accept_array'}}
+}
+
+// Variably-modified types cannot be used in local classes.
+void local_classes(int N) { // expected-note {{declared here}}
+  struct X {
+    int size;
+    int array[N]; // expected-error{{fields must have a constant size: 'variable length array in structure' extension will never be supported}} \
+                  // expected-error{{reference to local variable 'N' declared in enclosing function 'local_classes'}} \
+                  // expected-warning{{variable length arrays are a C99 feature}}
+  };
+}
+
+namespace PR7206 {
+  void f(int x) {
+    struct edge_info {
+      float left;
+      float right;
+    };
+    struct edge_info edgeInfo[x]; // expected-warning{{variable length arrays are a C99 feature}}
+  }
+}
+
+namespace rdar8020206 {
+  template<typename T>
+  void f(int i) {
+    const unsigned value = i;
+    int array[value * i]; // expected-warning 2{{variable length arrays are a C99 feature}}
+  }
+
+  template void f<int>(int); // expected-note{{instantiation of}}
+}
+
+namespace rdar8021385 {
+  typedef int my_int;
+  struct A { typedef int my_int; };
+  template<typename T>
+  struct B {
+    typedef typename T::my_int my_int;
+    void f0() {
+      int M = 4;
+      my_int a[M]; // expected-warning{{variable length arrays are a C99 feature}}
+    }
+  };
+  B<A> a;
+}
+
+namespace PR8209 {
+  void f(int n) {
+    typedef int vla_type[n]; // expected-warning{{variable length arrays are a C99 feature}}
+    (void)new vla_type; // expected-error{{variably}}
+  }
+}
+
+namespace rdar8733881 { // rdar://8733881
+
+static const int k_cVal3 = (int)(1000*0.2f);
+  int f() {
+    // Ok, fold to a constant size array as an extension.
+    char rgch[k_cVal3] = {0};
+  }
+}
+
+namespace PR11744 {
+  template<typename T> int f(int n) {
+    T arr[3][n]; // expected-warning 3 {{variable length arrays are a C99 feature}}
+    return 3;
+  }
+  int test = f<int>(0); // expected-note {{instantiation of}}
+}
-- 
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