#include "LTOModule.h"
+#include "llvm/Constants.h"
#include "llvm/Module.h"
#include "llvm/ModuleProvider.h"
#include "llvm/ADT/OwningPtr.h"
LTOModule* LTOModule::makeLTOModule(const void* mem, size_t length,
- std::string& errMsg)
+ std::string& errMsg)
{
OwningPtr<MemoryBuffer> buffer(makeBuffer(mem, length));
if ( !buffer )
}
}
-void LTOModule::addDefinedDataSymbol(GlobalValue* v, Mangler &mangler)
+// get string that data pointer points to
+bool LTOModule::objcClassNameFromExpression(Constant* c, std::string& name)
+{
+ if (ConstantExpr* ce = dyn_cast<ConstantExpr>(c)) {
+ Constant* op = ce->getOperand(0);
+ if (GlobalVariable* gvn = dyn_cast<GlobalVariable>(op)) {
+ Constant* cn = gvn->getInitializer();
+ if (ConstantArray* ca = dyn_cast<ConstantArray>(cn)) {
+ if ( ca->isCString() ) {
+ name = ".objc_class_name_" + ca->getAsString();
+ return true;
+ }
+ }
+ }
+ }
+ return false;
+}
+
+// parse i386/ppc ObjC class data structure
+void LTOModule::addObjCClass(GlobalVariable* clgv)
+{
+ if (ConstantStruct* c = dyn_cast<ConstantStruct>(clgv->getInitializer())) {
+ // second slot in __OBJC,__class is pointer to superclass name
+ std::string superclassName;
+ if ( objcClassNameFromExpression(c->getOperand(1), superclassName) ) {
+ NameAndAttributes info;
+ if ( _undefines.find(superclassName.c_str()) == _undefines.end() ) {
+ const char* symbolName = ::strdup(superclassName.c_str());
+ info.name = ::strdup(symbolName);
+ info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
+ // string is owned by _undefines
+ _undefines[info.name] = info;
+ }
+ }
+ // third slot in __OBJC,__class is pointer to class name
+ std::string className;
+ if ( objcClassNameFromExpression(c->getOperand(2), className) ) {
+ const char* symbolName = ::strdup(className.c_str());
+ NameAndAttributes info;
+ info.name = symbolName;
+ info.attributes = (lto_symbol_attributes)
+ (LTO_SYMBOL_PERMISSIONS_DATA |
+ LTO_SYMBOL_DEFINITION_REGULAR |
+ LTO_SYMBOL_SCOPE_DEFAULT);
+ _symbols.push_back(info);
+ _defines[info.name] = 1;
+ }
+ }
+}
+
+
+// parse i386/ppc ObjC category data structure
+void LTOModule::addObjCCategory(GlobalVariable* clgv)
+{
+ if (ConstantStruct* c = dyn_cast<ConstantStruct>(clgv->getInitializer())) {
+ // second slot in __OBJC,__category is pointer to target class name
+ std::string targetclassName;
+ if ( objcClassNameFromExpression(c->getOperand(1), targetclassName) ) {
+ NameAndAttributes info;
+ if ( _undefines.find(targetclassName.c_str()) == _undefines.end() ){
+ const char* symbolName = ::strdup(targetclassName.c_str());
+ info.name = ::strdup(symbolName);
+ info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
+ // string is owned by _undefines
+ _undefines[info.name] = info;
+ }
+ }
+ }
+}
+
+
+// parse i386/ppc ObjC class list data structure
+void LTOModule::addObjCClassRef(GlobalVariable* clgv)
+{
+ std::string targetclassName;
+ if ( objcClassNameFromExpression(clgv->getInitializer(), targetclassName) ){
+ NameAndAttributes info;
+ if ( _undefines.find(targetclassName.c_str()) == _undefines.end() ) {
+ const char* symbolName = ::strdup(targetclassName.c_str());
+ info.name = ::strdup(symbolName);
+ info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
+ // string is owned by _undefines
+ _undefines[info.name] = info;
+ }
+ }
+}
+
+
+void LTOModule::addDefinedDataSymbol(GlobalValue* v, Mangler& mangler)
{
// add to list of defined symbols
addDefinedSymbol(v, mangler, false);
+ // Special case i386/ppc ObjC data structures in magic sections:
+ // The issue is that the old ObjC object format did some strange
+ // contortions to avoid real linker symbols. For instance, the
+ // ObjC class data structure is allocated statically in the executable
+ // that defines that class. That data structures contains a pointer to
+ // its superclass. But instead of just initializing that part of the
+ // struct to the address of its superclass, and letting the static and
+ // dynamic linkers do the rest, the runtime works by having that field
+ // instead point to a C-string that is the name of the superclass.
+ // At runtime the objc initialization updates that pointer and sets
+ // it to point to the actual super class. As far as the linker
+ // knows it is just a pointer to a string. But then someone wanted the
+ // linker to issue errors at build time if the superclass was not found.
+ // So they figured out a way in mach-o object format to use an absolute
+ // symbols (.objc_class_name_Foo = 0) and a floating reference
+ // (.reference .objc_class_name_Bar) to cause the linker into erroring when
+ // a class was missing.
+ // The following synthesizes the implicit .objc_* symbols for the linker
+ // from the ObjC data structures generated by the front end.
+ if ( v->hasSection() /* && isTargetDarwin */ ) {
+ // special case if this data blob is an ObjC class definition
+ if ( v->getSection().compare(0, 15, "__OBJC,__class,") == 0 ) {
+ if (GlobalVariable* gv = dyn_cast<GlobalVariable>(v)) {
+ addObjCClass(gv);
+ }
+ }
+
+ // special case if this data blob is an ObjC category definition
+ else if ( v->getSection().compare(0, 18, "__OBJC,__category,") == 0 ) {
+ if (GlobalVariable* gv = dyn_cast<GlobalVariable>(v)) {
+ addObjCCategory(gv);
+ }
+ }
+
+ // special case if this data blob is the list of referenced classes
+ else if ( v->getSection().compare(0, 18, "__OBJC,__cls_refs,") == 0 ) {
+ if (GlobalVariable* gv = dyn_cast<GlobalVariable>(v)) {
+ addObjCClassRef(gv);
+ }
+ }
+ }
+
// add external symbols referenced by this data.
for (unsigned count = 0, total = v->getNumOperands();
count != total; ++count) {
void LTOModule::addDefinedSymbol(GlobalValue* def, Mangler &mangler,
bool isFunction)
{
+ // ignore all llvm.* symbols
+ if ( strncmp(def->getNameStart(), "llvm.", 5) == 0 )
+ return;
+
// string is owned by _defines
const char* symbolName = ::strdup(mangler.getValueName(def).c_str());
-
+
// set alignment part log2() can have rounding errors
uint32_t align = def->getAlignment();
uint32_t attr = align ? CountTrailingZeros_32(def->getAlignment()) : 0;
// set scope part
if ( def->hasHiddenVisibility() )
attr |= LTO_SYMBOL_SCOPE_HIDDEN;
+ else if ( def->hasProtectedVisibility() )
+ attr |= LTO_SYMBOL_SCOPE_PROTECTED;
else if ( def->hasExternalLinkage() || def->hasWeakLinkage()
|| def->hasLinkOnceLinkage() || def->hasCommonLinkage() )
attr |= LTO_SYMBOL_SCOPE_DEFAULT;
}
void LTOModule::addAsmGlobalSymbol(const char *name) {
- // string is owned by _defines
- const char *symbolName = ::strdup(name);
- uint32_t attr = LTO_SYMBOL_DEFINITION_REGULAR;
- attr |= LTO_SYMBOL_SCOPE_DEFAULT;
-
- // add to table of symbols
- NameAndAttributes info;
- info.name = symbolName;
- info.attributes = (lto_symbol_attributes)attr;
- _symbols.push_back(info);
- _defines[info.name] = 1;
+ // only add new define if not already defined
+ if ( _defines.count(name, &name[strlen(name)+1]) == 0 )
+ return;
+
+ // string is owned by _defines
+ const char *symbolName = ::strdup(name);
+ uint32_t attr = LTO_SYMBOL_DEFINITION_REGULAR;
+ attr |= LTO_SYMBOL_SCOPE_DEFAULT;
+ NameAndAttributes info;
+ info.name = symbolName;
+ info.attributes = (lto_symbol_attributes)attr;
+ _symbols.push_back(info);
+ _defines[info.name] = 1;
}
void LTOModule::addPotentialUndefinedSymbol(GlobalValue* decl, Mangler &mangler)
{
- const char* name = mangler.getValueName(decl).c_str();
// ignore all llvm.* symbols
- if ( strncmp(name, "llvm.", 5) != 0 ) {
- _undefines[name] = 1;
- }
+ if ( strncmp(decl->getNameStart(), "llvm.", 5) == 0 )
+ return;
+
+ const char* name = mangler.getValueName(decl).c_str();
+
+ // we already have the symbol
+ if (_undefines.find(name) != _undefines.end())
+ return;
+
+ NameAndAttributes info;
+ // string is owned by _undefines
+ info.name = ::strdup(name);
+ if (decl->hasExternalWeakLinkage())
+ info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF;
+ else
+ info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
+ _undefines[name] = info;
}
// Use mangler to add GlobalPrefix to names to match linker names.
Mangler mangler(*_module, _target->getTargetAsmInfo()->getGlobalPrefix());
+ // add chars used in ObjC method names so method names aren't mangled
+ mangler.markCharAcceptable('[');
+ mangler.markCharAcceptable(']');
+ mangler.markCharAcceptable('(');
+ mangler.markCharAcceptable(')');
+ mangler.markCharAcceptable('-');
+ mangler.markCharAcceptable('+');
+ mangler.markCharAcceptable(' ');
// add functions
for (Module::iterator f = _module->begin(); f != _module->end(); ++f) {
}
// make symbols for all undefines
- for (StringSet::iterator it=_undefines.begin();
+ for (StringMap<NameAndAttributes>::iterator it=_undefines.begin();
it != _undefines.end(); ++it) {
// if this symbol also has a definition, then don't make an undefine
// because it is a tentative definition
if ( _defines.count(it->getKeyData(), it->getKeyData()+
it->getKeyLength()) == 0 ) {
- NameAndAttributes info;
- info.name = it->getKeyData();
- info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
- _symbols.push_back(info);
+ NameAndAttributes info = it->getValue();
+ _symbols.push_back(info);
}
}
}
projects / oota-llvm.git / blobdiff