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[Driver] Export symbols needed to use profile runtime 

Apple's API verification tool (tapi) checks that the symbols exported
from a program match a whitelist. When the program uses the profile
runtime, some additional symbols which are typically not part of the
regular whitelist must be exported.

If we're using symbol export directives along with the profile runtime
on Darwin, the driver needs to export the additional symbols to avoid
verification failures.

rdar://problem/30067753

llvm-svn: 315518
This commit is contained in:
Vedant Kumar 2017-10-11 21:54:09 +00:00
parent 8c8e83a15f
commit f538018562
2 changed files with 43 additions and 0 deletions
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29
clang/lib/Driver/ToolChains/Darwin.cpp
View File

@ -986,6 +986,25 @@ StringRef Darwin::getOSLibraryNameSuffix() const {
llvm_unreachable("Unsupported platform");
}
/// Check if the link command contains a symbol export directive.
static bool hasExportSymbolDirective(const ArgList &Args) {
for (Arg *A : Args) {
if (!A->getOption().matches(options::OPT_Wl_COMMA) &&
!A->getOption().matches(options::OPT_Xlinker))
continue;
if (A->containsValue("-exported_symbols_list") ||
A->containsValue("-exported_symbol"))
return true;
}
return false;
}
/// Add an export directive for \p Symbol to the link command.
static void addExportedSymbol(ArgStringList &CmdArgs, const char *Symbol) {
CmdArgs.push_back("-exported_symbol");
CmdArgs.push_back(Symbol);
}
void Darwin::addProfileRTLibs(const ArgList &Args,
ArgStringList &CmdArgs) const {
if (!needsProfileRT(Args)) return;
@ -994,6 +1013,16 @@ void Darwin::addProfileRTLibs(const ArgList &Args,
Args, CmdArgs,
(Twine("libclang_rt.profile_") + getOSLibraryNameSuffix() + ".a").str(),
RuntimeLinkOptions(RLO_AlwaysLink | RLO_FirstLink));
// If we have a symbol export directive and we're linking in the profile
// runtime, automatically export symbols necessary to implement some of the
// runtime's functionality.
if (hasExportSymbolDirective(Args)) {
addExportedSymbol(CmdArgs, "_VPMergeHook");
addExportedSymbol(CmdArgs, "___llvm_profile_filename");
addExportedSymbol(CmdArgs, "___llvm_profile_raw_version");
addExportedSymbol(CmdArgs, "_lprofCurFilename");
}
}
void DarwinClang::AddLinkSanitizerLibArgs(const ArgList &Args,

14
clang/test/Driver/darwin-ld.c
View File

@ -351,3 +351,17 @@
// RUN: %clang -target arm64-apple-ios5.0 -miphoneos-version-min=5.0 -fprofile-instr-generate -### %t.o 2> %t.log
// RUN: FileCheck -check-prefix=LINK_PROFILE_FIRST %s < %t.log
// LINK_PROFILE_FIRST: {{ld(.exe)?"}} "{{[^"]+}}libclang_rt.profile_{{[a-z]+}}.a"
// RUN: %clang -target x86_64-apple-darwin12 -fprofile-instr-generate -Wl,-exported_symbols_list,/dev/null -### %t.o 2> %t.log
// RUN: FileCheck -check-prefix=PROFILE_EXPORT %s < %t.log
// RUN: %clang -target x86_64-apple-darwin12 -fprofile-instr-generate -Wl,-exported_symbol,foo -### %t.o 2> %t.log
// RUN: FileCheck -check-prefix=PROFILE_EXPORT %s < %t.log
// RUN: %clang -target x86_64-apple-darwin12 -fprofile-instr-generate -Xlinker -exported_symbol -Xlinker foo -### %t.o 2> %t.log
// RUN: FileCheck -check-prefix=PROFILE_EXPORT %s < %t.log
// RUN: %clang -target x86_64-apple-darwin12 -fprofile-instr-generate -Xlinker -exported_symbols_list -Xlinker /dev/null -### %t.o 2> %t.log
// RUN: FileCheck -check-prefix=PROFILE_EXPORT %s < %t.log
// PROFILE_EXPORT: "-exported_symbol" "_VPMergeHook" "-exported_symbol" "___llvm_profile_filename" "-exported_symbol" "___llvm_profile_raw_version" "-exported_symbol" "_lprofCurFilename"
//
// RUN: %clang -target x86_64-apple-darwin12 -fprofile-instr-generate -### %t.o 2> %t.log
// RUN: FileCheck -check-prefix=NO_PROFILE_EXPORT %s < %t.log
// NO_PROFILE_EXPORT-NOT: "-exported_symbol"