Author: David Blaikie
Date: 2021-09-13T19:17:05-07:00
New Revision: 2bd84938470bf2e337801faafb8a67710f46429d

URL: 
https://github.com/llvm/llvm-project/commit/2bd84938470bf2e337801faafb8a67710f46429d
DIFF: 
https://github.com/llvm/llvm-project/commit/2bd84938470bf2e337801faafb8a67710f46429d.diff

LOG: Improve type printing of const arrays to normalize array-of-const and 
const-array

Since these map to the same effective type - render them the same/in the
more legible way (const x[n]).

Added: 
    

Modified: 
    clang/lib/AST/TypePrinter.cpp
    clang/test/ARCMT/cxx-checking.mm
    clang/test/AST/ast-dump-APValue-arithmetic.cpp
    clang/test/AST/ast-dump-APValue-array.cpp
    clang/test/CXX/basic/basic.types/p10.cpp
    clang/test/Sema/assign.c
    clang/test/Sema/typedef-retain.c
    clang/test/SemaCXX/reinterpret-cast.cpp
    clang/test/SemaCXX/static-assert-cxx17.cpp

Removed: 
    


################################################################################
diff  --git a/clang/lib/AST/TypePrinter.cpp b/clang/lib/AST/TypePrinter.cpp
index aef1e4f3f4953..251db97c7db08 100644
--- a/clang/lib/AST/TypePrinter.cpp
+++ b/clang/lib/AST/TypePrinter.cpp
@@ -200,11 +200,12 @@ bool TypePrinter::canPrefixQualifiers(const Type *T,
   // type expands to a simple string.
   bool CanPrefixQualifiers = false;
   NeedARCStrongQualifier = false;
-  Type::TypeClass TC = T->getTypeClass();
+  const Type *UnderlyingType = T;
   if (const auto *AT = dyn_cast<AutoType>(T))
-    TC = AT->desugar()->getTypeClass();
+    UnderlyingType = AT->desugar().getTypePtr();
   if (const auto *Subst = dyn_cast<SubstTemplateTypeParmType>(T))
-    TC = Subst->getReplacementType()->getTypeClass();
+    UnderlyingType = Subst->getReplacementType().getTypePtr();
+  Type::TypeClass TC = UnderlyingType->getTypeClass();
 
   switch (TC) {
     case Type::Auto:
@@ -243,6 +244,9 @@ bool TypePrinter::canPrefixQualifiers(const Type *T,
 
     case Type::ConstantArray:
     case Type::IncompleteArray:
+      return canPrefixQualifiers(
+          cast<ArrayType>(UnderlyingType)->getElementType().getTypePtr(),
+          NeedARCStrongQualifier);
     case Type::VariableArray:
     case Type::DependentSizedArray:
       NeedARCStrongQualifier = true;

diff  --git a/clang/test/ARCMT/cxx-checking.mm 
b/clang/test/ARCMT/cxx-checking.mm
index 952f3cdcbb79c..d6441def09b40 100644
--- a/clang/test/ARCMT/cxx-checking.mm
+++ b/clang/test/ARCMT/cxx-checking.mm
@@ -80,7 +80,7 @@
 
 struct FlexibleArrayMember0 {
   int length;
-  id array[]; // expected-error{{flexible array member 'array' of type 'id 
__strong[]' with non-trivial destruction}}
+  id array[]; // expected-error{{flexible array member 'array' of type 
'__strong id []' with non-trivial destruction}}
 };
 
 struct FlexibleArrayMember1 {

diff  --git a/clang/test/AST/ast-dump-APValue-arithmetic.cpp 
b/clang/test/AST/ast-dump-APValue-arithmetic.cpp
index 835d8c8108346..e51c1cee04cfe 100644
--- a/clang/test/AST/ast-dump-APValue-arithmetic.cpp
+++ b/clang/test/AST/ast-dump-APValue-arithmetic.cpp
@@ -36,13 +36,13 @@ void Test() {
   // CHECK-NEXT:  |   |-value: ComplexFloat 3.141500e+00 + 4.200000e+01i
 
   constexpr _Complex int ArrayOfComplexInt[10] = {ComplexInt, ComplexInt, 
ComplexInt, ComplexInt};
-  // CHECK:  | `-VarDecl {{.*}} <col:{{.*}}, col:{{.*}}> col:{{.*}} 
ArrayOfComplexInt '_Complex int const[10]' constexpr cinit
+  // CHECK:  | `-VarDecl {{.*}} <col:{{.*}}, col:{{.*}}> col:{{.*}} 
ArrayOfComplexInt 'const _Complex int [10]' constexpr cinit
   // CHECK-NEXT:  |   |-value: Array size=10
   // CHECK-NEXT:  |   | |-elements: ComplexInt 42 + 24i, ComplexInt 42 + 24i, 
ComplexInt 42 + 24i, ComplexInt 42 + 24i
   // CHECK-NEXT:  |   | `-filler: 6 x ComplexInt 0 + 0i
 
   constexpr _Complex float ArrayOfComplexFloat[10] = {ComplexFloat, 
ComplexFloat, ComplexInt, ComplexInt};
-  // CHECK:    `-VarDecl {{.*}} <col:{{.*}}, col:{{.*}}> col:{{.*}} 
ArrayOfComplexFloat '_Complex float const[10]' constexpr cinit
+  // CHECK:    `-VarDecl {{.*}} <col:{{.*}}, col:{{.*}}> col:{{.*}} 
ArrayOfComplexFloat 'const _Complex float [10]' constexpr cinit
   // CHECK-NEXT:      |-value: Array size=10
   // CHECK-NEXT:      | |-elements: ComplexFloat 3.141500e+00 + 4.200000e+01i, 
ComplexFloat 3.141500e+00 + 4.200000e+01i, ComplexFloat 4.200000e+01 + 
2.400000e+01i, ComplexFloat 4.200000e+01 + 2.400000e+01i
   // CHECK-NEXT:      | `-filler: 6 x ComplexFloat 0.000000e+00 + 0.000000e+00i

diff  --git a/clang/test/AST/ast-dump-APValue-array.cpp 
b/clang/test/AST/ast-dump-APValue-array.cpp
index f9b38ec332a5b..72e519208ac56 100644
--- a/clang/test/AST/ast-dump-APValue-array.cpp
+++ b/clang/test/AST/ast-dump-APValue-array.cpp
@@ -43,7 +43,7 @@ void Test() {
   constexpr float arr_f[3][5] = {
       {1, 2, 3, 4, 5},
   };
-  // CHECK:  | `-VarDecl {{.*}} <line:{{.*}}, line:{{.*}}> line:{{.*}} arr_f 
'float const[3][5]' constexpr cinit
+  // CHECK:  | `-VarDecl {{.*}} <line:{{.*}}, line:{{.*}}> line:{{.*}} arr_f 
'const float [3][5]' constexpr cinit
   // CHECK-NEXT:  |   |-value: Array size=3
   // CHECK-NEXT:  |   | |-element: Array size=5
   // CHECK-NEXT:  |   | | |-elements: Float 1.000000e+00, Float 2.000000e+00, 
Float 3.000000e+00, Float 4.000000e+00
@@ -52,7 +52,7 @@ void Test() {
   // CHECK-NEXT:  |   |   `-filler: 5 x Float 0.000000e+00
 
   constexpr S0 arr_s0[2] = {{1, 2}, {3, 4}};
-  // CHECK:  | `-VarDecl {{.*}} <col:{{.*}}, col:{{.*}}> col:{{.*}} arr_s0 'S0 
const[2]' constexpr cinit
+  // CHECK:  | `-VarDecl {{.*}} <col:{{.*}}, col:{{.*}}> col:{{.*}} arr_s0 
'const S0 [2]' constexpr cinit
   // CHECK-NEXT:  |   |-value: Array size=2
   // CHECK-NEXT:  |   | |-element: Struct
   // CHECK-NEXT:  |   | | `-field: Array size=2
@@ -62,12 +62,12 @@ void Test() {
   // CHECK-NEXT:  |   |     `-elements: Int 3, Int 4
 
   constexpr U0 arr_u0[2] = {{.i = 42}, {.f = 3.1415f}};
-  // CHECK:  | `-VarDecl {{.*}} <col:{{.*}}, col:{{.*}}> col:{{.*}} arr_u0 'U0 
const[2]' constexpr cinit
+  // CHECK:  | `-VarDecl {{.*}} <col:{{.*}}, col:{{.*}}> col:{{.*}} arr_u0 
'const U0 [2]' constexpr cinit
   // CHECK-NEXT:  |   |-value: Array size=2
   // CHECK-NEXT:  |   | `-elements: Union .i Int 42, Union .f Float 
3.141500e+00
 
   constexpr S1 arr_s1[2] = {};
-  // CHECK:    `-VarDecl {{.*}} <col:{{.*}}, col:{{.*}}> col:{{.*}} arr_s1 'S1 
const[2]' constexpr cinit
+  // CHECK:    `-VarDecl {{.*}} <col:{{.*}}, col:{{.*}}> col:{{.*}} arr_s1 
'const S1 [2]' constexpr cinit
   // CHECK-NEXT:      |-value: Array size=2
   // CHECK-NEXT:      | |-element: Struct
   // CHECK-NEXT:      | | |-field: Struct

diff  --git a/clang/test/CXX/basic/basic.types/p10.cpp 
b/clang/test/CXX/basic/basic.types/p10.cpp
index aac07c76bed2e..eae0c6513ac24 100644
--- a/clang/test/CXX/basic/basic.types/p10.cpp
+++ b/clang/test/CXX/basic/basic.types/p10.cpp
@@ -32,7 +32,7 @@ struct Incomplete; // expected-note 2{{forward declaration of 
'Incomplete'}}
 template<class T> struct ClassTemp {};
 
 constexpr Incomplete incomplete = {}; // expected-error {{constexpr variable 
cannot have non-literal type 'const Incomplete'}} expected-note {{incomplete 
type 'const Incomplete' is not a literal type}}
-constexpr Incomplete incomplete2[] = {}; // expected-error {{constexpr 
variable cannot have non-literal type 'Incomplete const[]'}} expected-note 
{{incomplete type 'Incomplete const[]' is not a literal type}}
+constexpr Incomplete incomplete2[] = {}; // expected-error {{constexpr 
variable cannot have non-literal type 'const Incomplete []'}} expected-note 
{{incomplete type 'const Incomplete []' is not a literal type}}
 constexpr ClassTemp<int> classtemplate = {};
 constexpr ClassTemp<int> classtemplate2[] = {};
 

diff  --git a/clang/test/Sema/assign.c b/clang/test/Sema/assign.c
index 3edd5d4feaf2e..d65f9bf26547e 100644
--- a/clang/test/Sema/assign.c
+++ b/clang/test/Sema/assign.c
@@ -13,7 +13,7 @@ typedef int arr[10];
 void test3() {
   const arr b;      // expected-note {{variable 'b' declared const here}}
   const int b2[10]; // expected-note {{variable 'b2' declared const here}}
-  b[4] = 1;         // expected-error {{cannot assign to variable 'b' with 
const-qualified type 'const arr' (aka 'int const[10]')}}
+  b[4] = 1;         // expected-error {{cannot assign to variable 'b' with 
const-qualified type 'const arr' (aka 'const int [10]')}}
   b2[4] = 1;        // expected-error {{cannot assign to variable 'b2' with 
const-qualified type 'const int [10]'}}
 }
 

diff  --git a/clang/test/Sema/typedef-retain.c 
b/clang/test/Sema/typedef-retain.c
index 70e2abc1da5b8..d4358bce5ee5b 100644
--- a/clang/test/Sema/typedef-retain.c
+++ b/clang/test/Sema/typedef-retain.c
@@ -17,7 +17,7 @@ typedef int a[5];
 void test3() {
   typedef const a b;
   b r;       // expected-note {{variable 'r' declared const here}}
-  r[0] = 10; // expected-error {{cannot assign to variable 'r' with 
const-qualified type 'b' (aka 'int const[5]')}}
+  r[0] = 10; // expected-error {{cannot assign to variable 'r' with 
const-qualified type 'b' (aka 'const int [5]')}}
 }
 
 int test4(const a y) {

diff  --git a/clang/test/SemaCXX/reinterpret-cast.cpp 
b/clang/test/SemaCXX/reinterpret-cast.cpp
index 6a4bc91665448..f427af1efbafc 100644
--- a/clang/test/SemaCXX/reinterpret-cast.cpp
+++ b/clang/test/SemaCXX/reinterpret-cast.cpp
@@ -132,7 +132,7 @@ void const_arrays() {
   const STRING *s;
   const char *c;
 
-  (void)reinterpret_cast<char *>(s); // expected-error {{reinterpret_cast from 
'const STRING *' (aka 'char const (*)[10]') to 'char *' casts away qualifiers}}
+  (void)reinterpret_cast<char *>(s); // expected-error {{reinterpret_cast from 
'const STRING *' (aka 'const char (*)[10]') to 'char *' casts away qualifiers}}
   (void)reinterpret_cast<const STRING *>(c);
 }
 

diff  --git a/clang/test/SemaCXX/static-assert-cxx17.cpp 
b/clang/test/SemaCXX/static-assert-cxx17.cpp
index fe02f8f29965f..d5601839bdd3e 100644
--- a/clang/test/SemaCXX/static-assert-cxx17.cpp
+++ b/clang/test/SemaCXX/static-assert-cxx17.cpp
@@ -94,7 +94,7 @@ void foo6() {
   static_assert(static_cast<const X<typename T::T> *>(nullptr));
   // expected-error@-1{{static_assert failed due to requirement 
'static_cast<const X<int> *>(nullptr)'}}
   static_assert((const X<typename T::T>[]){} == nullptr);
-  // expected-error@-1{{static_assert failed due to requirement '(X<int> 
const[0]){} == nullptr'}}
+  // expected-error@-1{{static_assert failed due to requirement '(const X<int> 
[0]){} == nullptr'}}
   static_assert(sizeof(X<decltype(X<typename T::T>().X<typename T::T>::~X())>) 
== 0);
   // expected-error@-1{{static_assert failed due to requirement 
'sizeof(X<void>) == 0'}}
   static_assert(constexpr_return_false<typename T::T, typename T::U>());


        
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