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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
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
// RUN: %clang_cc1 -triple %itanium_abi_triple -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK --check-prefix=ITANIUM
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// RUN: %clang_cc1 -triple %ms_abi_triple -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK --check-prefix=MSABI
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// Should be 3 hello strings, two global (of different sizes), the rest are
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// shared.
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// CHECK: @align = global i8 [[ALIGN:[0-9]+]]
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// ITANIUM: @.str = private unnamed_addr constant [6 x i8] c"hello\00"
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// MSABI: @"\01??_C@_05CJBACGMB@hello?$AA@" = linkonce_odr unnamed_addr constant [6 x i8] c"hello\00", align 1
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// ITANIUM: @f1.x = internal global i8* getelementptr inbounds ([6 x i8]* @.str, i32 0, i32 0)
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// MSABI: @f1.x = internal global i8* getelementptr inbounds ([6 x i8]* @"\01??_C@_05CJBACGMB@hello?$AA@", i32 0, i32 0)
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// CHECK: @f2.x = internal global [6 x i8] c"hello\00", align [[ALIGN]]
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// CHECK: @f3.x = internal global [8 x i8] c"hello\00\00\00", align [[ALIGN]]
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// ITANIUM: @f4.x = internal global %struct.s { i8* getelementptr inbounds ([6 x i8]* @.str, i32 0, i32 0) }
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// MSABI: @f4.x = internal global %struct.s { i8* getelementptr inbounds ([6 x i8]* @"\01??_C@_05CJBACGMB@hello?$AA@", i32 0, i32 0) }
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// CHECK: @x = global [3 x i8] c"ola", align [[ALIGN]]
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#if defined(__s390x__)
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unsigned char align = 2;
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#else
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unsigned char align = 1;
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#endif
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void bar(const char *);
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// CHECK-LABEL: define void @f0()
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void f0() {
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bar("hello");
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// ITANIUM: call void @bar({{.*}} @.str
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// MSABI: call void @bar({{.*}} @"\01??_C@_05CJBACGMB@hello?$AA@"
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}
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// CHECK-LABEL: define void @f1()
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void f1() {
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static char *x = "hello";
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bar(x);
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// CHECK: [[T1:%.*]] = load i8** @f1.x
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// CHECK: call void @bar(i8* [[T1:%.*]])
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}
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// CHECK-LABEL: define void @f2()
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void f2() {
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static char x[] = "hello";
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bar(x);
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// CHECK: call void @bar({{.*}} @f2.x
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}
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// CHECK-LABEL: define void @f3()
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void f3() {
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static char x[8] = "hello";
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bar(x);
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// CHECK: call void @bar({{.*}} @f3.x
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}
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void gaz(void *);
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// CHECK-LABEL: define void @f4()
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void f4() {
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static struct s {
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char *name;
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} x = { "hello" };
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gaz(&x);
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// CHECK: call void @gaz({{.*}} @f4.x
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}
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char x[3] = "ola";
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