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0e4cf807ae
These actually can be automatically imported from another DLL. (This works properly as long as the actual implementation of emutls is linked dynamically from e.g. libgcc; if the implementation comes from compiler-rt or a statically linked libgcc, it doesn't work as intended.) This fixes PR50146 and https://github.com/msys2/MINGW-packages/issues/8706 (fixing calling std::call_once in a dynamically linked libstdc++); since f73183958482602c4588b0f4a1c3a096e7542947 the dso_local attribute on the TLS variable affected the actual generated code for accessing the emutls variable. The dso_local attribute on the emutls variable made those accesses to use 32 bit relative addressing in code, which requires runtime pseudo relocations in the text section, and breaks entirely if the actual other variable ends up loaded too far away in the virtual address space. Differential Revision: https://reviews.llvm.org/D102970
142 lines
7.2 KiB
C
142 lines
7.2 KiB
C
// RUN: %clang_cc1 -triple x86_64-pc-win32 -emit-llvm %s -o - | FileCheck --check-prefix=COFF %s
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// COFF: @baz = dso_local global i32 42
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// COFF-NEXT: @import_var = external dllimport global i32
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// COFF-NEXT: @weak_bar = extern_weak global i32
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// COFF-NEXT: @bar = external dso_local global i32
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// COFF-NEXT: @local_thread_var = dso_local thread_local global i32 42
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// COFF-NEXT: @thread_var = external dso_local thread_local global i32
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// COFF-DAG: declare dso_local void @foo()
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// COFF-DAG: define dso_local i32* @zed()
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// COFF-DAG: declare dllimport void @import_func()
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// RUN: %clang_cc1 -triple x86_64-w64-mingw32 -emit-llvm %s -o - | FileCheck --check-prefixes=MINGW,MINGW-NATIVE_TLS %s
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// RUN: %clang_cc1 -triple x86_64-w64-mingw32 -emit-llvm %s -o - -femulated-tls | FileCheck --check-prefixes=MINGW,MINGW-EMUTLS %s
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// MINGW: @baz = dso_local global i32 42
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// MINGW-NEXT: @import_var = external dllimport global i32
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// MINGW-NEXT: @weak_bar = extern_weak global i32
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// MINGW-NEXT: @bar = external global i32
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// MINGW-NEXT: @local_thread_var = dso_local thread_local global i32 42
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// MINGW-NATIVE_TLS-NEXT: @thread_var = external dso_local thread_local global i32
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// MINGW-EMUTLS-NEXT: @thread_var = external thread_local global i32
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// MINGW-DAG: declare dso_local void @foo()
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// MINGW-DAG: define dso_local i32* @zed()
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// MINGW-DAG: declare dllimport void @import_func()
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/// Static relocation model defaults to -fdirect-access-external-data and sets
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/// dso_local on most global objects.
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// RUN: %clang_cc1 -triple x86_64 -emit-llvm -mrelocation-model static %s -o - | FileCheck --check-prefix=STATIC %s
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// RUN: %clang_cc1 -triple x86_64 -emit-llvm -mrelocation-model static -fdirect-access-external-data %s -o - | FileCheck --check-prefix=STATIC %s
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// STATIC: @baz = dso_local global i32 42
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// STATIC-NEXT: @import_var = external dso_local global i32
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// STATIC-NEXT: @weak_bar = extern_weak dso_local global i32
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// STATIC-NEXT: @bar = external dso_local global i32
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// STATIC-NEXT: @local_thread_var = dso_local thread_local global i32 42
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// STATIC-NEXT: @thread_var = external thread_local global i32
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// STATIC-DAG: declare dso_local void @foo()
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// STATIC-DAG: define dso_local i32* @zed()
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// STATIC-DAG: declare dso_local void @import_func()
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/// If -fno-direct-access-external-data is set, drop dso_local from global variable
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/// declarations.
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// RUN: %clang_cc1 -triple x86_64 -emit-llvm %s -mrelocation-model static -fno-direct-access-external-data -o - | FileCheck --check-prefix=STATIC-INDIRECT %s
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// STATIC-INDIRECT: @baz = dso_local global i32 42
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// STATIC-INDIRECT-NEXT: @import_var = external global i32
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// STATIC-INDIRECT-NEXT: @weak_bar = extern_weak global i32
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// STATIC-INDIRECT-NEXT: @bar = external global i32
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// STATIC-INDIRECT-NEXT: @local_thread_var = dso_local thread_local global i32 42
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// STATIC-INDIRECT-NEXT: @thread_var = external thread_local global i32
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// STATIC-INDIRECT-DAG: declare void @import_func()
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// STATIC-INDIRECT-DAG: define dso_local i32* @zed()
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// STATIC-INDIRECT-DAG: declare void @foo()
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// RUN: %clang_cc1 -triple x86_64 -emit-llvm -pic-level 1 -pic-is-pie %s -o - | FileCheck --check-prefix=PIE %s
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// PIE: @baz = dso_local global i32 42
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// PIE-NEXT: @import_var = external global i32
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// PIE-NEXT: @weak_bar = extern_weak global i32
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// PIE-NEXT: @bar = external global i32
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// PIE-NEXT: @local_thread_var = dso_local thread_local global i32 42
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// PIE-NEXT: @thread_var = external thread_local global i32
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// PIE-DAG: declare void @foo()
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// PIE-DAG: define dso_local i32* @zed()
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// PIE-DAG: declare void @import_func()
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// RUN: %clang_cc1 -triple x86_64 -emit-llvm -pic-level 1 -pic-is-pie -fdirect-access-external-data %s -o - | FileCheck --check-prefix=PIE-DIRECT %s
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// PIE-DIRECT: @baz = dso_local global i32 42
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// PIE-DIRECT-NEXT: @import_var = external dso_local global i32
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// PIE-DIRECT-NEXT: @weak_bar = extern_weak global i32
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// PIE-DIRECT-NEXT: @bar = external dso_local global i32
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// PIE-DIRECT-NEXT: @local_thread_var = dso_local thread_local global i32 42
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// PIE-DIRECT-NEXT: @thread_var = external thread_local global i32
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// PIE-DIRECT-DAG: declare void @foo()
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// PIE-DIRECT-DAG: define dso_local i32* @zed()
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// PIE-DIRECT-DAG: declare void @import_func()
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// RUN: %clang_cc1 -triple x86_64 -emit-llvm -mrelocation-model static -fno-plt %s -o - | FileCheck --check-prefix=NOPLT %s
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// NOPLT: @baz = dso_local global i32 42
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// NOPLT-NEXT: @import_var = external dso_local global i32
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// NOPLT-NEXT: @weak_bar = extern_weak dso_local global i32
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// NOPLT-NEXT: @bar = external dso_local global i32
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// NOPLT-NEXT: @local_thread_var = dso_local thread_local global i32 42
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// NOPLT-NEXT: @thread_var = external thread_local global i32
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// NOPLT-DAG: declare void @foo()
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// NOPLT-DAG: define dso_local i32* @zed()
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// NOPLT-DAG: declare void @import_func()
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// RUN: %clang_cc1 -triple x86_64 -emit-llvm -fno-plt -pic-level 1 -pic-is-pie -fdirect-access-external-data %s -o - | FileCheck --check-prefix=PIE-DIRECT-NOPLT %s
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// PIE-DIRECT-NOPLT: @baz = dso_local global i32 42
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// PIE-DIRECT-NOPLT-NEXT: @import_var = external dso_local global i32
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// PIE-DIRECT-NOPLT-NEXT: @weak_bar = extern_weak global i32
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// PIE-DIRECT-NOPLT-NEXT: @bar = external dso_local global i32
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// PIE-DIRECT-NOPLT-NEXT: @local_thread_var = dso_local thread_local global i32 42
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// PIE-DIRECT-NOPLT-NEXT: @thread_var = external thread_local global i32
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// PIE-DIRECT-NOPLT-DAG: declare void @foo()
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// PIE-DIRECT-NOPLT-DAG: define dso_local i32* @zed()
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// PIE-DIRECT-NOPLT-DAG: declare void @import_func()
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// RUN: %clang_cc1 -triple x86_64 -emit-llvm -pic-level 1 -pic-is-pie -fno-plt %s -o - | FileCheck --check-prefix=PIE-NO-PLT %s
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// RUN: %clang_cc1 -triple powerpc64le -emit-llvm -mrelocation-model static %s -o - | FileCheck --check-prefix=PIE-NO-PLT %s
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// PIE-NO-PLT: @baz = dso_local global i32 42
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// PIE-NO-PLT-NEXT: @import_var = external global i32
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// PIE-NO-PLT-NEXT: @weak_bar = extern_weak global i32
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// PIE-NO-PLT-NEXT: @bar = external global i32
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// PIE-NO-PLT-NEXT: @local_thread_var = dso_local thread_local global i32 42
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// PIE-NO-PLT-NEXT: @thread_var = external thread_local global i32
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// PIE-NO-PLT-DAG: declare void @import_func()
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// PIE-NO-PLT-DAG: define dso_local i32* @zed()
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// PIE-NO-PLT-DAG: declare void @foo()
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/// -fdirect-access-external-data is currently ignored for -fPIC.
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// RUN: %clang_cc1 -triple x86_64 -emit-llvm -pic-level 2 %s -o - | FileCheck --check-prefix=SHARED %s
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// RUN: %clang_cc1 -triple x86_64 -emit-llvm -pic-level 2 -fdirect-access-external-data %s -o - | FileCheck --check-prefix=SHARED %s
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// SHARED-DAG: @bar = external global i32
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// SHARED-DAG: @weak_bar = extern_weak global i32
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// SHARED-DAG: declare void @foo()
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// SHARED-DAG: @baz ={{.*}} global i32 42
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// SHARED-DAG: define{{.*}} i32* @zed()
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// SHARED-DAG: @thread_var = external thread_local global i32
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// SHARED-DAG: @local_thread_var ={{.*}} thread_local global i32 42
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int baz = 42;
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__attribute__((dllimport)) extern int import_var;
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__attribute__((weak)) extern int weak_bar;
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extern int bar;
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__attribute__((dllimport)) void import_func(void);
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int *use_import() {
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import_func();
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return &import_var;
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}
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void foo(void);
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int *zed() {
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foo();
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return baz ? &weak_bar : &bar;
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}
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__thread int local_thread_var = 42;
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extern __thread int thread_var;
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int *get_thread_var(int a) {
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return a ? &thread_var : &local_thread_var;
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}
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