On 1/14/19 11:09 PM, Tom Honermann wrote:
On 1/4/19 7:25 PM, Martin Sebor wrote:
On 12/27/18 1:49 PM, Tom Honermann wrote:
As requested by Jason in the review of the P0482 (char8_t) core
language changes, this patch includes updates to the error messages
emitted for ill-formed cases of array initialization with a string
literal. With these changes, error messages that previously looked
something like these:
- "char-array initialized from wide string"
- "wide character array initialized from non-wide string"
- "wide character array initialized from incompatible wide string"
now look like:
- "cannot initialize array of type 'char' from a string literal with
type array of 'short unsigned int'"
The first word "type" doesn't quite work here. The type of every
array is "array of T" where T is the type of the element, so for
instance, "array of char." Saying "array of type X" makes it sound
like X is the type of the whole array, which is of course not
the case when X is char. I think you want to use the same wording
as for the second type:
"cannot initialize array of 'char' from a string literal with
type array of 'short unsigned int'"
or perhaps even better
"cannot initialize array of 'char' from a string literal with
type 'char16_t[N]'"
(i.e., show the actual type of the string, including its bound).
Thank you for the feedback, Martin; sorry for the delayed response. I'll
follow up with a revised patch within the next week or two.
I actually incorporated the C++ part of these changes into yesterday's
commit, using Martin's first suggestion. Here's the adjusted C patch,
which I'd like a C maintainer to approve.
Jason
commit dc77155cc9868b6b5e7c634fd46813b81361e7ee
Author: Jason Merrill <ja...@redhat.com>
Date: Wed Jan 9 15:01:53 2019 -0500
Improve the C error for mismatched array string literal initialization.
* c-typeck.c (digest_init): Revised the error message produced for
ill-formed cases of array initialization with a string literal.
diff --git a/gcc/c/c-typeck.c b/gcc/c/c-typeck.c
index 63d177f7a6f..c7c5c627c2e 100644
--- a/gcc/c/c-typeck.c
+++ b/gcc/c/c-typeck.c
@@ -7722,6 +7722,7 @@ digest_init (location_t init_loc, tree type, tree init, tree origtype,
{
struct c_expr expr;
tree typ2 = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init)));
+ bool incompat_string_cst = false;
expr.value = inside_init;
expr.original_code = (strict_string ? STRING_CST : ERROR_MARK);
expr.original_type = NULL;
@@ -7738,27 +7739,18 @@ digest_init (location_t init_loc, tree type, tree init, tree origtype,
if (char_array)
{
if (typ2 != char_type_node)
- {
- error_init (init_loc, "char-array initialized from wide "
- "string");
- return error_mark_node;
- }
- }
- else
- {
- if (typ2 == char_type_node)
- {
- error_init (init_loc, "wide character array initialized "
- "from non-wide string");
- return error_mark_node;
- }
- else if (!comptypes(typ1, typ2))
- {
- error_init (init_loc, "wide character array initialized "
- "from incompatible wide string");
- return error_mark_node;
- }
+ incompat_string_cst = true;
}
+ else if (!comptypes (typ1, typ2))
+ incompat_string_cst = true;
+
+ if (incompat_string_cst)
+ {
+ error_init (init_loc, "cannot initialize array of %qT from "
+ "a string literal with type array of %qT",
+ typ1, typ2);
+ return error_mark_node;
+ }
if (TYPE_DOMAIN (type) != NULL_TREE
&& TYPE_SIZE (type) != NULL_TREE
diff --git a/gcc/testsuite/gcc.dg/init-string-2.c b/gcc/testsuite/gcc.dg/init-string-2.c
index 9efd44b3d2f..9b11073c913 100644
--- a/gcc/testsuite/gcc.dg/init-string-2.c
+++ b/gcc/testsuite/gcc.dg/init-string-2.c
@@ -28,8 +28,8 @@ uchar a8[] = "foo"; /* { dg-error "string constant" "a8" } */
const schar a9[] = "foo"; /* { dg-error "string constant" "a9" } */
short a10[] = L"foo"; /* { dg-error "string constant" "a10" } */
const sshrt a11[] = L"foo"; /* { dg-error "string constant" "a11" } */
-char a12[] = L"foo"; /* { dg-error "from wide string" "a12" } */
-wchar_t a13[] = "foo"; /* { dg-error "non-wide string" "a13" } */
+char a12[] = L"foo"; /* { dg-error "from a string literal with type array of .short unsigned int." "a12" } */
+wchar_t a13[] = "foo"; /* { dg-error "from a string literal with type array of .char." "a13" } */
char b0[] = { "foo" };
const signed char b2[4] = { "foo" };
@@ -43,8 +43,8 @@ uchar b8[] = { "foo" }; /* { dg-error "string constant" "b8" } */
const schar b9[] = { "foo" }; /* { dg-error "string constant" "b9" } */
short b10[] = { L"foo" }; /* { dg-error "string constant" "b10" } */
const sshrt b11[] = { L"foo" }; /* { dg-error "string constant" "b11" } */
-char b12[] = { L"foo" }; /* { dg-error "from wide string" "b12" } */
-wchar_t b13[] = { "foo" }; /* { dg-error "non-wide string" "b13" } */
+char b12[] = { L"foo" }; /* { dg-error "from a string literal with type array of .short unsigned int." "b12" } */
+wchar_t b13[] = { "foo" }; /* { dg-error "from a string literal with type array of .char." "b13" } */
struct s { signed char a[10]; int b; ushrt c[10]; };
diff --git a/gcc/testsuite/gcc.dg/pr61096-1.c b/gcc/testsuite/gcc.dg/pr61096-1.c
index 6678d812eb5..4b9da582fe7 100644
--- a/gcc/testsuite/gcc.dg/pr61096-1.c
+++ b/gcc/testsuite/gcc.dg/pr61096-1.c
@@ -19,9 +19,9 @@ struct g
struct f f; /* { dg-warning "invalid use of structure with flexible array member" } */
};
-char w1[] = L"foo"; /* { dg-error "13:char-array initialized from wide string" } */
-__WCHAR_TYPE__ w2[] = "foo"; /* { dg-error "23:wide character array initialized from non-wide string" } */
-__WCHAR_TYPE__ w3[] = U"foo"; /* { dg-error "23:wide character array initialized from incompatible wide string" } */
+char w1[] = L"foo"; /* { dg-error "13:array of .char. from a string literal with type array of .short unsigned int." } */
+__WCHAR_TYPE__ w2[] = "foo"; /* { dg-error "23:array of .short unsigned int. from a string literal with type array of .char." } */
+__WCHAR_TYPE__ w3[] = U"foo"; /* { dg-error "23:array of .short unsigned int. from a string literal with type array of .unsigned int." } */
schar a1[] = "foo"; /* { dg-error "14:array of inappropriate type initialized from string constant" } */
int a2[] = (int[]) { 1 }; /* { dg-warning "12:initializer element is not constant" } */
diff --git a/gcc/testsuite/gcc.dg/utf-array-short-wchar.c b/gcc/testsuite/gcc.dg/utf-array-short-wchar.c
index ec478121a07..1691bbc0475 100644
--- a/gcc/testsuite/gcc.dg/utf-array-short-wchar.c
+++ b/gcc/testsuite/gcc.dg/utf-array-short-wchar.c
@@ -10,33 +10,37 @@ typedef __CHAR16_TYPE__ char16_t;
typedef __CHAR32_TYPE__ char32_t;
const char s_0[] = "ab";
-const char s_1[] = u"ab"; /* { dg-error "from wide string" } */
-const char s_2[] = U"ab"; /* { dg-error "from wide string" } */
-const char s_3[] = L"ab"; /* { dg-error "from wide string" } */
+const char s_1[] = u"ab"; /* { dg-error "from a string literal with type array of .short unsigned int." } */
+const char s_2[] = U"ab"; /* { dg-error "from a string literal with type array of .unsigned int." } */
+const char s_3[] = L"ab"; /* { dg-error "from a string literal with type array of .short unsigned int." } */
+const char s_4[] = u8"ab";
-const char16_t s16_0[] = "ab"; /* { dg-error "from non-wide" } */
+const char16_t s16_0[] = "ab"; /* { dg-error "from a string literal with type array of .char." } */
const char16_t s16_1[] = u"ab";
-const char16_t s16_2[] = U"ab"; /* { dg-error "from incompatible" } */
+const char16_t s16_2[] = U"ab"; /* { dg-error "from a string literal with type array of .unsigned int." } */
const char16_t s16_3[] = L"ab";
+const char16_t s16_4[] = u8"ab"; /* { dg-error "from a string literal with type array of .char." } */
-const char16_t s16_4[0] = u"ab"; /* { dg-warning "chars is too long" } */
-const char16_t s16_5[1] = u"ab"; /* { dg-warning "chars is too long" } */
-const char16_t s16_6[2] = u"ab";
-const char16_t s16_7[3] = u"ab";
-const char16_t s16_8[4] = u"ab";
+const char16_t s16_5[0] = u"ab"; /* { dg-warning "chars is too long" } */
+const char16_t s16_6[1] = u"ab"; /* { dg-warning "chars is too long" } */
+const char16_t s16_7[2] = u"ab";
+const char16_t s16_8[3] = u"ab";
+const char16_t s16_9[4] = u"ab";
-const char32_t s32_0[] = "ab"; /* { dg-error "from non-wide" } */
-const char32_t s32_1[] = u"ab"; /* { dg-error "from incompatible" } */
+const char32_t s32_0[] = "ab"; /* { dg-error "from a string literal with type array of .char." } */
+const char32_t s32_1[] = u"ab"; /* { dg-error "from a string literal with type array of .short unsigned int." } */
const char32_t s32_2[] = U"ab";
-const char32_t s32_3[] = L"ab"; /* { dg-error "from incompatible" } */
+const char32_t s32_3[] = L"ab"; /* { dg-error "from a string literal with type array of .short unsigned int." } */
+const char32_t s32_4[] = u8"ab"; /* { dg-error "from a string literal with type array of .char." } */
-const char32_t s32_4[0] = U"ab"; /* { dg-warning "chars is too long" } */
-const char32_t s32_5[1] = U"ab"; /* { dg-warning "chars is too long" } */
-const char32_t s32_6[2] = U"ab"; /* { dg-warning "chars is too long" "" { target "m32c-*-*" } } */
-const char32_t s32_7[3] = U"ab"; /* { dg-warning "chars is too long" "" { target "m32c-*-*" } } */
-const char32_t s32_8[4] = U"ab"; /* { dg-warning "chars is too long" "" { target "m32c-*-*" } } */
+const char32_t s32_5[0] = U"ab"; /* { dg-warning "chars is too long" } */
+const char32_t s32_6[1] = U"ab"; /* { dg-warning "chars is too long" } */
+const char32_t s32_7[2] = U"ab"; /* { dg-warning "chars is too long" "" { target "m32c-*-*" } } */
+const char32_t s32_8[3] = U"ab"; /* { dg-warning "chars is too long" "" { target "m32c-*-*" } } */
+const char32_t s32_9[4] = U"ab"; /* { dg-warning "chars is too long" "" { target "m32c-*-*" } } */
-const wchar_t sw_0[] = "ab"; /* { dg-error "from non-wide" } */
+const wchar_t sw_0[] = "ab"; /* { dg-error "from a string literal with type array of .char." } */
const wchar_t sw_1[] = u"ab";
-const wchar_t sw_2[] = U"ab"; /* { dg-error "from incompatible" } */
+const wchar_t sw_2[] = U"ab"; /* { dg-error "from a string literal with type array of .unsigned int." } */
const wchar_t sw_3[] = L"ab";
+const wchar_t sw_4[] = u8"ab"; /* { dg-error "from a string literal with type array of .char." } */
diff --git a/gcc/testsuite/gcc.dg/utf-array.c b/gcc/testsuite/gcc.dg/utf-array.c
index 433ddcfaf48..da6a0c9233a 100644
--- a/gcc/testsuite/gcc.dg/utf-array.c
+++ b/gcc/testsuite/gcc.dg/utf-array.c
@@ -10,33 +10,37 @@ typedef __CHAR16_TYPE__ char16_t;
typedef __CHAR32_TYPE__ char32_t;
const char s_0[] = "ab";
-const char s_1[] = u"ab"; /* { dg-error "from wide string" } */
-const char s_2[] = U"ab"; /* { dg-error "from wide string" } */
-const char s_3[] = L"ab"; /* { dg-error "from wide string" } */
+const char s_1[] = u"ab"; /* { dg-error "from a string literal with type array of .short unsigned int." } */
+const char s_2[] = U"ab"; /* { dg-error "from a string literal with type array of .unsigned int." } */
+const char s_3[] = L"ab"; /* { dg-error "from a string literal with type array of .int." } */
+const char s_4[] = u8"ab";
-const char16_t s16_0[] = "ab"; /* { dg-error "from non-wide" } */
+const char16_t s16_0[] = "ab"; /* { dg-error "from a string literal with type array of .char." } */
const char16_t s16_1[] = u"ab";
-const char16_t s16_2[] = U"ab"; /* { dg-error "from incompatible" } */
-const char16_t s16_3[] = L"ab"; /* { dg-error "from incompatible" "" { target { ! wchar_t_char16_t_compatible } } } */
+const char16_t s16_2[] = U"ab"; /* { dg-error "from a string literal with type array of .unsigned int." } */
+const char16_t s16_3[] = L"ab"; /* { dg-error "from a string literal with type array of .int." "" { target { ! wchar_t_char16_t_compatible } } } */
+const char16_t s16_4[] = u8"ab"; /* { dg-error "from a string literal with type array of .char." } */
-const char16_t s16_4[0] = u"ab"; /* { dg-warning "chars is too long" } */
-const char16_t s16_5[1] = u"ab"; /* { dg-warning "chars is too long" } */
-const char16_t s16_6[2] = u"ab";
-const char16_t s16_7[3] = u"ab";
-const char16_t s16_8[4] = u"ab";
+const char16_t s16_5[0] = u"ab"; /* { dg-warning "chars is too long" } */
+const char16_t s16_6[1] = u"ab"; /* { dg-warning "chars is too long" } */
+const char16_t s16_7[2] = u"ab";
+const char16_t s16_8[3] = u"ab";
+const char16_t s16_9[4] = u"ab";
-const char32_t s32_0[] = "ab"; /* { dg-error "from non-wide" } */
-const char32_t s32_1[] = u"ab"; /* { dg-error "from incompatible" } */
+const char32_t s32_0[] = "ab"; /* { dg-error "from a string literal with type array of .char." } */
+const char32_t s32_1[] = u"ab"; /* { dg-error "from a string literal with type array of .short unsigned int." } */
const char32_t s32_2[] = U"ab";
-const char32_t s32_3[] = L"ab"; /* { dg-error "from incompatible" "" { target { ! wchar_t_char32_t_compatible } } } */
+const char32_t s32_3[] = L"ab"; /* { dg-error "from a string literal with type array of .int." "" { target { ! wchar_t_char32_t_compatible } } } */
+const char32_t s32_4[] = u8"ab"; /* { dg-error "from a string literal with type array of .char." } */
-const char32_t s32_4[0] = U"ab"; /* { dg-warning "chars is too long" } */
-const char32_t s32_5[1] = U"ab"; /* { dg-warning "chars is too long" } */
-const char32_t s32_6[2] = U"ab"; /* { dg-warning "chars is too long" "" { target "m32c-*-*" } } */
-const char32_t s32_7[3] = U"ab"; /* { dg-warning "chars is too long" "" { target "m32c-*-*" } } */
-const char32_t s32_8[4] = U"ab"; /* { dg-warning "chars is too long" "" { target "m32c-*-*" } } */
+const char32_t s32_5[0] = U"ab"; /* { dg-warning "chars is too long" } */
+const char32_t s32_6[1] = U"ab"; /* { dg-warning "chars is too long" } */
+const char32_t s32_7[2] = U"ab"; /* { dg-warning "chars is too long" "" { target "m32c-*-*" } } */
+const char32_t s32_8[3] = U"ab"; /* { dg-warning "chars is too long" "" { target "m32c-*-*" } } */
+const char32_t s32_9[4] = U"ab"; /* { dg-warning "chars is too long" "" { target "m32c-*-*" } } */
-const wchar_t sw_0[] = "ab"; /* { dg-error "from non-wide" } */
-const wchar_t sw_1[] = u"ab"; /* { dg-error "from incompatible" "" { target { ! wchar_t_char16_t_compatible } } } */
-const wchar_t sw_2[] = U"ab"; /* { dg-error "from incompatible" "" { target { ! wchar_t_char32_t_compatible } } } */
+const wchar_t sw_0[] = "ab"; /* { dg-error "from a string literal with type array of .char." } */
+const wchar_t sw_1[] = u"ab"; /* { dg-error "from a string literal with type array of .short unsigned int." "" { target { ! wchar_t_char16_t_compatible } } } */
+const wchar_t sw_2[] = U"ab"; /* { dg-error "from a string literal with type array of .unsigned int." "" { target { ! wchar_t_char32_t_compatible } } } */
const wchar_t sw_3[] = L"ab";
+const wchar_t sw_4[] = u8"ab"; /* { dg-error "from a string literal with type array of .char." } */
diff --git a/gcc/testsuite/gcc.dg/utf8-2.c b/gcc/testsuite/gcc.dg/utf8-2.c
index f3b83fe3341..d96b15dccb7 100644
--- a/gcc/testsuite/gcc.dg/utf8-2.c
+++ b/gcc/testsuite/gcc.dg/utf8-2.c
@@ -8,9 +8,9 @@ typedef __CHAR16_TYPE__ char16_t;
typedef __CHAR32_TYPE__ char32_t;
const char s0[] = u8"ab";
-const char16_t s1[] = u8"ab"; /* { dg-error "from non-wide" } */
-const char32_t s2[] = u8"ab"; /* { dg-error "from non-wide" } */
-const wchar_t s3[] = u8"ab"; /* { dg-error "from non-wide" } */
+const char16_t s1[] = u8"ab"; /* { dg-error "from a string literal with type array of .char." } */
+const char32_t s2[] = u8"ab"; /* { dg-error "from a string literal with type array of .char." } */
+const wchar_t s3[] = u8"ab"; /* { dg-error "from a string literal with type array of .char." } */
const char t0[0] = u8"ab"; /* { dg-warning "chars is too long" } */
const char t1[1] = u8"ab"; /* { dg-warning "chars is too long" } */
