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-fvisibility=hidden: Only hide function *definitions*, don't touch declarations (#2923)

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Martin Kinkelin 2018-12-03 20:59:59 +01:00 • committed by GitHub
parent 7966987178
commit deaaab8cf3
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 73 additions and 59 deletions
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23
gen/functions.cpp
View file

@ -574,13 +574,6 @@ void DtoDeclareFunction(FuncDeclaration *fdecl) {
: LLGlobalValue::DLLExportStorageClass);
}
// Hide non-exported symbols
if (opts::defaultToHiddenVisibility &&
!fdecl->isImportedSymbol() &&
!fdecl->isExport()) {
func->setVisibility(LLGlobalValue::HiddenVisibility);
}
IF_LOG Logger::cout() << "func = " << *func << std::endl;
// add func to IRFunc
@ -981,12 +974,6 @@ void DtoDefineFunction(FuncDeclaration *fd, bool linkageAvailableExternally) {
}
}
// if this function is naked, we take over right away! no standard processing!
if (fd->naked) {
DtoDefineNakedFunction(fd);
return;
}
if (!fd->fbody) {
return;
}
@ -1002,6 +989,16 @@ void DtoDefineFunction(FuncDeclaration *fd, bool linkageAvailableExternally) {
return;
}
if (opts::defaultToHiddenVisibility && !fd->isExport()) {
func->setVisibility(LLGlobalValue::HiddenVisibility);
}
// if this function is naked, we take over right away! no standard processing!
if (fd->naked) {
DtoDefineNakedFunction(fd);
return;
}
SCOPE_EXIT {
if (irFunc->isDynamicCompiled()) {
defineDynamicCompiledFunction(gIR, irFunc);

38
tests/codegen/export_marked_symbols1.d
View file

@ -1,26 +1,24 @@
// Test that passing -fvisibility=hidden hides all unexported symbols
// Tests -fvisibility={default,hidden} for function definitions and
// (non-extern) globals on non-Windows targets.
// UNSUPPORTED: Windows
// RUN: ldc2 %s -betterC -shared -fvisibility=hidden -of=lib%t.so
// RUN: nm -g lib%t.so | FileCheck %s
// RUN: ldc2 %s -betterC -shared -fvisibility=default -of=lib%t_default%so
// RUN: nm -g lib%t_default%so | FileCheck -check-prefix=DEFAULT %s
// CHECK: test__exportedFunDef
// CHECK: test__exportedVarDef
// CHECK-NOT: test__nonExportedFunDecl
// CHECK-NOT: test__nonExportedFunDef
// CHECK-NOT: test__nonExportedVarDecl
// CHECK-NOT: test__nonExportedVarDef
// RUN: ldc2 %s -betterC -shared -fvisibility=hidden -of=lib%t_hidden%so
// RUN: nm -g lib%t_hidden%so | FileCheck -check-prefix=HIDDEN %s
extern(C) export int test__exportedFun() { return 42; }
// DEFAULT: test__exportedFun
// HIDDEN: test__exportedFun
extern(C) export int test__exportedVar;
// DEFAULT: test__exportedVar
// HIDDEN: test__exportedVar
extern(C) export int test__exportedFunDef() { return 42; }
extern(C) int test__nonExportedFunDef() { return 101; }
extern(C) export int test__exportedFunDecl();
extern(C) int test__nonExportedFunDecl();
extern(C) export int test__exportedVarDef;
extern(C) int test__nonExportedVarDef;
extern(C) extern export int test__exportedVarDecl;
extern(C) extern int test__nonExportedVarDecl;
extern(C) int test__nonExportedFun() { return 101; }
// DEFAULT: test__nonExportedFun
// HIDDEN-NOT: test__nonExportedFun
extern(C) int test__nonExportedVar;
// DEFAULT: test__nonExportedVar
// HIDDEN-NOT: test__nonExportedVar

42
tests/codegen/export_marked_symbols2.d
View file

@ -1,26 +1,32 @@
// Test that compiling with -fvisibility=default exports all symbols on non-Windows targets
// Tests that -fvisibility=hidden doesn't affect imported and fwd declared symbols,
// so that they can still be linked in from a shared library.
// UNSUPPORTED: Windows
// RUN: ldc2 %s -betterC -shared -fvisibility=default -of=lib%t.so
// RUN: nm -g lib%t.so | FileCheck %s
// RUN: ldc2 %S/inputs/export_marked_symbols_lib.d -shared -of=%t_lib%so
// RUN: ldc2 %s -I%S/inputs -fvisibility=hidden -of=%t%exe %t_lib%so
// RUN: ldc2 %s -I%S/inputs -fvisibility=hidden -of=%t%exe %t_lib%so -d-version=DECLARE_MANUALLY
// CHECK: test__exportedFunDef
// CHECK: test__exportedVarDef
// CHECK-NOT: test__nonExportedFunDecl
// CHECK: test__nonExportedFunDef
// CHECK-NOT: test__nonExportedVarDecl
// CHECK: test__nonExportedVarDef
version (DECLARE_MANUALLY)
{
extern(C++):
export extern __gshared int exportedGlobal;
extern __gshared int normalGlobal;
extern(C) export int test__exportedFunDef() { return 42; }
extern(C) int test__nonExportedFunDef() { return 101; }
export void exportedFoo();
void normalFoo();
}
else
{
import export_marked_symbols_lib;
}
extern(C) export int test__exportedFunDecl();
extern(C) int test__nonExportedFunDecl();
void main()
{
exportedGlobal = 1;
normalGlobal = 2;
extern(C) export int test__exportedVarDef;
extern(C) int test__nonExportedVarDef;
extern(C) extern export int test__exportedVarDecl;
extern(C) extern int test__nonExportedVarDecl;
exportedFoo();
normalFoo();
}

15
tests/codegen/export_marked_symbols_thin_lto.d
View file

@ -1,15 +1,18 @@
// Test that -fvisibility=hidden works with thin LTO
// Tests that mismatching symbol visibilities between declarations and definitions
// work with thin LTO.
// REQUIRES: LTO
// RUN: ldc2 %S/inputs/export_marked_symbols_thin_lto_lib.d -c -fvisibility=hidden -flto=thin -of=%t1%obj
// RUN: ldc2 %s -I%S/inputs -c -flto=thin -of=%t2%obj
// RUN: ldc2 %t1%obj %t2%obj -flto=thin
// RUN: ldc2 %S/inputs/export_marked_symbols_lib.d -c -fvisibility=hidden -flto=thin -of=%t_lib%obj
// RUN: ldc2 %s -I%S/inputs -flto=thin -of=%t%exe %t_lib%obj
import export_marked_symbols_thin_lto_lib;
import export_marked_symbols_lib;
void main()
{
exportedGlobal = 1;
normalGlobal = 2; // declared in this module with default visibility, defined as hidden
exportedFoo();
normalFoo();
normalFoo(); // ditto
}

7
tests/codegen/inputs/export_marked_symbols_lib.d Normal file
View file

@ -0,0 +1,7 @@
extern(C++): // so that we can manually declare the symbols in another module too
export __gshared int exportedGlobal;
__gshared int normalGlobal;
export void exportedFoo() {}
void normalFoo() {}

2
tests/codegen/inputs/export_marked_symbols_thin_lto_lib.d
View file

@ -1,2 +0,0 @@
export void exportedFoo() {}
void normalFoo() {} // hidden visibility

5
tests/lit.site.cfg.in
View file

@ -156,11 +156,16 @@ if (platform.system() == 'Windows'):
config.substitutions.append( ('%obj', '.obj') )
config.substitutions.append( ('%exe', '.exe') )
config.substitutions.append( ('%lib', '.lib') )
config.substitutions.append( ('%so', '.dll') )
config.substitutions.append( ('%diff_binary ', 'fc /b ') )
else:
config.substitutions.append( ('%obj', '.o') )
config.substitutions.append( ('%exe', '') )
config.substitutions.append( ('%lib', '.a') )
if (platform.system() == 'Darwin'):
config.substitutions.append( ('%so', '.dylib') )
else:
config.substitutions.append( ('%so', '.so') )
config.substitutions.append( ('%diff_binary ', 'cmp -s ') )
# Add cdb substitution