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58e5bee17a
COFF doesn't have mergeable sections so LLVM/clang's normal tactics for string deduplication will not have any effect. To remedy this we place each string inside it's own section and mark the section as IMAGE_COMDAT_SELECT_ANY. However, we can only do this if the string has an external name that we can generate from it's contents. To be compatible with MSVC, we must use their scheme. Otherwise identical strings in translation units from clang may not be deduplicated with translation units in MSVC. This fixes PR18248. N.B. We will not attempt to do anything with a string literal which is not of type 'char' or 'wchar_t' because their compiler does not support unicode string literals as of this date. Further, we avoid doing this if either -fwritable-strings or -fsanitize=address are present. This reverts commit r204596. llvm-svn: 204675
36 lines
1.3 KiB
C
36 lines
1.3 KiB
C
// RUN: %clang_cc1 -x c++ -triple %itanium_abi_triple -emit-llvm -fshort-wchar %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=ITANIUM
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// RUN: %clang_cc1 -x c++ -triple %ms_abi_triple -emit-llvm -fshort-wchar %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=MSABI
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// Runs in c++ mode so that wchar_t is available.
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int main() {
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// This should convert to utf8.
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// CHECK: private unnamed_addr constant [10 x i8] c"\E1\84\A0\C8\A0\F4\82\80\B0\00", align 1
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char b[10] = "\u1120\u0220\U00102030";
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// ITANIUM: private unnamed_addr constant [3 x i16] [i16 65, i16 66, i16 0]
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// MSABI: linkonce_odr unnamed_addr constant [3 x i16] [i16 65, i16 66, i16 0]
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const wchar_t *foo = L"AB";
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// This should convert to utf16.
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// ITANIUM: private unnamed_addr constant [5 x i16] [i16 4384, i16 544, i16 -9272, i16 -9168, i16 0]
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// MSABI: linkonce_odr unnamed_addr constant [5 x i16] [i16 4384, i16 544, i16 -9272, i16 -9168, i16 0]
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const wchar_t *bar = L"\u1120\u0220\U00102030";
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// Should pick second character.
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// CHECK: store i8 98
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char c = 'ab';
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// CHECK: store i16 97
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wchar_t wa = L'a';
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// Should pick second character.
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// CHECK: store i16 98
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wchar_t wb = L'ab';
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// -4085 == 0xf00b
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// CHECK: store i16 -4085
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wchar_t wc = L'\uF00B';
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}
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