//
//===----------------------------------------------------------------------===//
+#include "X86AsmPrinter.h"
#include "X86ATTAsmPrinter.h"
#include "X86IntelAsmPrinter.h"
+#include "X86MachineFunctionInfo.h"
#include "X86Subtarget.h"
-#include "X86.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/CallingConv.h"
#include "llvm/Constants.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/Support/Mangler.h"
-#include "llvm/Support/CommandLine.h"
-using namespace llvm;
-using namespace x86;
+#include "llvm/Target/TargetAsmInfo.h"
-Statistic<> llvm::x86::EmittedInsts("asm-printer",
- "Number of machine instrs printed");
+using namespace llvm;
-enum AsmWriterFlavorTy { att, intel };
-cl::opt<AsmWriterFlavorTy>
-AsmWriterFlavor("x86-asm-syntax",
- cl::desc("Choose style of code to emit from X86 backend:"),
- cl::values(
- clEnumVal(att, " Emit AT&T-style assembly"),
- clEnumVal(intel, " Emit Intel-style assembly"),
- clEnumValEnd),
- cl::init(att));
+Statistic<> llvm::EmittedInsts("asm-printer",
+ "Number of machine instrs printed");
-/// doInitialization
-bool X86SharedAsmPrinter::doInitialization(Module &M) {
- const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
+static X86FunctionInfo calculateFunctionInfo(const Function *F,
+ const TargetData *TD) {
+ X86FunctionInfo Info;
+ uint64_t Size = 0;
- forDarwin = false;
+ switch (F->getCallingConv()) {
+ case CallingConv::X86_StdCall:
+ Info.setDecorationStyle(StdCall);
+ break;
+ case CallingConv::X86_FastCall:
+ Info.setDecorationStyle(FastCall);
+ break;
+ default:
+ return Info;
+ }
+
+ for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
+ AI != AE; ++AI)
+ Size += TD->getTypeSize(AI->getType());
+
+ // Size should be aligned to DWORD boundary
+ Size = ((Size + 3)/4)*4;
- switch (Subtarget->TargetType) {
- case X86Subtarget::isDarwin:
- AlignmentIsInBytes = false;
- GlobalPrefix = "_";
- Data64bitsDirective = 0; // we can't emit a 64-bit unit
- ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
- PrivateGlobalPrefix = "L"; // Marker for constant pool idxs
- ConstantPoolSection = "\t.const\n";
- LCOMMDirective = "\t.lcomm\t";
- COMMDirectiveTakesAlignment = false;
- HasDotTypeDotSizeDirective = false;
- forDarwin = true;
+ // We're not supporting tooooo huge arguments :)
+ Info.setBytesToPopOnReturn((unsigned int)Size);
+ return Info;
+}
+
+
+/// decorateName - Query FunctionInfoMap and use this information for various
+/// name decoration.
+void X86SharedAsmPrinter::decorateName(std::string &Name,
+ const GlobalValue *GV) {
+ const Function *F = dyn_cast<Function>(GV);
+ if (!F) return;
+
+ // We don't want to decorate non-stdcall or non-fastcall functions right now
+ unsigned CC = F->getCallingConv();
+ if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
+ return;
+
+ FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
+
+ const X86FunctionInfo *Info;
+ if (info_item == FunctionInfoMap.end()) {
+ // Calculate apropriate function info and populate map
+ FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
+ Info = &FunctionInfoMap[F];
+ } else {
+ Info = &info_item->second;
+ }
+
+ switch (Info->getDecorationStyle()) {
+ case None:
break;
- case X86Subtarget::isCygwin:
- GlobalPrefix = "_";
- COMMDirectiveTakesAlignment = false;
- HasDotTypeDotSizeDirective = false;
+ case StdCall:
+ if (!F->isVarArg()) // Variadic functions do not receive @0 suffix.
+ Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
break;
- case X86Subtarget::isWindows:
- GlobalPrefix = "_";
- HasDotTypeDotSizeDirective = false;
+ case FastCall:
+ if (!F->isVarArg()) // Variadic functions do not receive @0 suffix.
+ Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
+
+ if (Name[0] == '_') {
+ Name[0] = '@';
+ } else {
+ Name = '@' + Name;
+ }
break;
- default: break;
+ default:
+ assert(0 && "Unsupported DecorationStyle");
}
-
- return AsmPrinter::doInitialization(M);
}
-/// EmitXXStructorList - Emit the ctor or dtor list. On darwin, this just
-/// prints out the function pointers.
-void X86SharedAsmPrinter::EmitXXStructorList(Constant *List) {
- // Should be an array of '{ int, void ()* }' structs. The first value is the
- // init priority, which we ignore.
- if (!isa<ConstantArray>(List)) return;
- ConstantArray *InitList = cast<ConstantArray>(List);
- for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
- if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
- if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
- // Emit the function pointer.
- EmitGlobalConstant(CS->getOperand(1));
- }
+/// doInitialization
+bool X86SharedAsmPrinter::doInitialization(Module &M) {
+ if (Subtarget->isTargetDarwin()) {
+ const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
+ if (!Subtarget->is64Bit())
+ X86PICStyle = PICStyle::Stub;
+
+ // Emit initial debug information.
+ DW.BeginModule(&M);
+ } else if (Subtarget->isTargetELF()) {
+ // Emit initial debug information.
+ DW.BeginModule(&M);
+ }
+
+ return AsmPrinter::doInitialization(M);
}
bool X86SharedAsmPrinter::doFinalization(Module &M) {
- const TargetData &TD = TM.getTargetData();
+ // Note: this code is not shared by the Intel printer as it is too different
+ // from how MASM does things. When making changes here don't forget to look
+ // at X86IntelAsmPrinter::doFinalization().
+ const TargetData *TD = TM.getTargetData();
// Print out module-level global variables here.
- for (Module::const_global_iterator I = M.global_begin(),
- E = M.global_end(); I != E; ++I) {
+ for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I) {
if (!I->hasInitializer()) continue; // External global require no code
- // Check to see if this is a special global used by LLVM.
- if (I->hasAppendingLinkage()) {
- if (I->getName() == "llvm.used")
- continue; // No need to emit this at all.
- if (I->getName() == "llvm.global_ctors") {
- if (forDarwin)
- SwitchSection(".mod_init_func", 0);
- else
- SwitchSection(".ctors,\"aw\",@progbits", 0);
- EmitAlignment(2, 0);
- EmitXXStructorList(I->getInitializer());
- continue;
- } else if (I->getName() == "llvm.global_dtors") {
- if (forDarwin)
- SwitchSection(".mod_term_func", 0);
- else
- SwitchSection(".dtors,\"aw\",@progbits", 0);
- EmitAlignment(2, 0);
- EmitXXStructorList(I->getInitializer());
- continue;
- }
- }
+ // Check to see if this is a special global used by LLVM, if so, emit it.
+ if (EmitSpecialLLVMGlobal(I))
+ continue;
- O << "\n\n";
std::string name = Mang->getValueName(I);
Constant *C = I->getInitializer();
- unsigned Size = TD.getTypeSize(C->getType());
- unsigned Align = TD.getTypeAlignmentShift(C->getType());
-
- switch (I->getLinkage()) {
- default: assert(0 && "Unknown linkage type!");
- case GlobalValue::LinkOnceLinkage:
- case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
- if (C->isNullValue()) {
- O << COMMDirective << name << "," << Size;
- if (COMMDirectiveTakesAlignment)
- O << "," << (1 << Align);
- O << "\t\t" << CommentString << " " << I->getName() << "\n";
- continue;
+ unsigned Size = TD->getTypeSize(C->getType());
+ unsigned Align = TD->getPreferredAlignmentLog(I);
+
+ if (C->isNullValue() && /* FIXME: Verify correct */
+ !I->hasSection() &&
+ (I->hasInternalLinkage() || I->hasWeakLinkage() ||
+ I->hasLinkOnceLinkage() ||
+ (Subtarget->isTargetDarwin() &&
+ I->hasExternalLinkage()))) {
+ if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
+ if (I->hasExternalLinkage()) {
+ O << "\t.globl\t" << name << "\n";
+ O << "\t.zerofill __DATA__, __common, " << name << ", "
+ << Size << ", " << Align;
+ } else {
+ SwitchToDataSection(TAI->getDataSection(), I);
+ if (TAI->getLCOMMDirective() != NULL) {
+ if (I->hasInternalLinkage()) {
+ O << TAI->getLCOMMDirective() << name << "," << Size;
+ if (Subtarget->isTargetDarwin())
+ O << "," << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
+ } else
+ O << TAI->getCOMMDirective() << name << "," << Size;
+ } else {
+ if (!Subtarget->isTargetCygwin()) {
+ if (I->hasInternalLinkage())
+ O << "\t.local\t" << name << "\n";
+ }
+ O << TAI->getCOMMDirective() << name << "," << Size;
+ if (TAI->getCOMMDirectiveTakesAlignment())
+ O << "," << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
+ }
}
-
- // Nonnull linkonce -> weak
- O << "\t.weak " << name << "\n";
- O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n";
- SwitchSection("", I);
- break;
- case GlobalValue::InternalLinkage:
- if (C->isNullValue()) {
- if (LCOMMDirective) {
- O << LCOMMDirective << name << "," << Size << "," << Align;
- continue;
+ O << "\t\t" << TAI->getCommentString() << " " << I->getName() << "\n";
+ } else {
+ switch (I->getLinkage()) {
+ case GlobalValue::LinkOnceLinkage:
+ case GlobalValue::WeakLinkage:
+ if (Subtarget->isTargetDarwin()) {
+ O << "\t.globl " << name << "\n"
+ << "\t.weak_definition " << name << "\n";
+ SwitchToDataSection(".section __DATA,__const_coal,coalesced", I);
+ } else if (Subtarget->isTargetCygwin()) {
+ std::string SectionName(".section\t.data$linkonce." +
+ name +
+ ",\"aw\"");
+ SwitchToDataSection(SectionName.c_str(), I);
+ O << "\t.globl " << name << "\n"
+ << "\t.linkonce same_size\n";
+ } else {
+ std::string SectionName("\t.section\t.llvm.linkonce.d." +
+ name +
+ ",\"aw\",@progbits");
+ SwitchToDataSection(SectionName.c_str(), I);
+ O << "\t.weak " << name << "\n";
+ }
+ break;
+ case GlobalValue::AppendingLinkage:
+ // FIXME: appending linkage variables should go into a section of
+ // their name or something. For now, just emit them as external.
+ case GlobalValue::DLLExportLinkage:
+ DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
+ // FALL THROUGH
+ case GlobalValue::ExternalLinkage:
+ // If external or appending, declare as a global symbol
+ O << "\t.globl " << name << "\n";
+ // FALL THROUGH
+ case GlobalValue::InternalLinkage: {
+ if (I->isConstant()) {
+ const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
+ if (TAI->getCStringSection() && CVA && CVA->isCString()) {
+ SwitchToDataSection(TAI->getCStringSection(), I);
+ break;
+ }
+ }
+ // FIXME: special handling for ".ctors" & ".dtors" sections
+ if (I->hasSection() &&
+ (I->getSection() == ".ctors" ||
+ I->getSection() == ".dtors")) {
+ std::string SectionName = ".section " + I->getSection();
+
+ if (Subtarget->isTargetCygwin()) {
+ SectionName += ",\"aw\"";
+ } else {
+ assert(!Subtarget->isTargetDarwin());
+ SectionName += ",\"aw\",@progbits";
+ }
+
+ SwitchToDataSection(SectionName.c_str());
} else {
- SwitchSection(".bss", I);
- O << "\t.local " << name << "\n";
- O << COMMDirective << name << "," << Size;
- if (COMMDirectiveTakesAlignment)
- O << "," << (1 << Align);
- O << "\t\t# ";
- WriteAsOperand(O, I, true, true, &M);
- O << "\n";
- continue;
+ SwitchToDataSection(TAI->getDataSection(), I);
}
+
+ break;
}
- SwitchSection(".data", I);
- break;
- case GlobalValue::AppendingLinkage:
- // FIXME: appending linkage variables should go into a section of
- // their name or something. For now, just emit them as external.
- case GlobalValue::ExternalLinkage:
- SwitchSection(C->isNullValue() ? ".bss" : ".data", I);
- // If external or appending, declare as a global symbol
- O << "\t.globl " << name << "\n";
- break;
- }
+ default:
+ assert(0 && "Unknown linkage type!");
+ }
+
+ EmitAlignment(Align, I);
+ O << name << ":\t\t\t\t" << TAI->getCommentString() << " " << I->getName()
+ << "\n";
+ if (TAI->hasDotTypeDotSizeDirective())
+ O << "\t.size " << name << ", " << Size << "\n";
- EmitAlignment(Align);
- if (HasDotTypeDotSizeDirective) {
- O << "\t.type " << name << ",@object\n";
- O << "\t.size " << name << "," << Size << "\n";
+ EmitGlobalConstant(C);
+ O << '\n';
}
- O << name << ":\t\t\t" << CommentString << ' ' << I->getName() << '\n';
- EmitGlobalConstant(C);
}
- if (forDarwin) {
- SwitchSection("", 0);
- // Output stubs for external global variables
- if (GVStubs.begin() != GVStubs.end())
- O << "\t.non_lazy_symbol_pointer\n";
- for (std::set<std::string>::iterator i = GVStubs.begin(), e = GVStubs.end();
+ // Output linker support code for dllexported globals
+ if (DLLExportedGVs.begin() != DLLExportedGVs.end()) {
+ SwitchToDataSection(".section .drectve", 0);
+ }
+
+ for (std::set<std::string>::iterator i = DLLExportedGVs.begin(),
+ e = DLLExportedGVs.end();
i != e; ++i) {
- O << "L" << *i << "$non_lazy_ptr:\n";
- O << "\t.indirect_symbol " << *i << "\n";
- O << "\t.long\t0\n";
- }
+ O << "\t.ascii \" -export:" << *i << ",data\"\n";
+ }
+
+ if (DLLExportedFns.begin() != DLLExportedFns.end()) {
+ SwitchToDataSection(".section .drectve", 0);
+ }
+
+ for (std::set<std::string>::iterator i = DLLExportedFns.begin(),
+ e = DLLExportedFns.end();
+ i != e; ++i) {
+ O << "\t.ascii \" -export:" << *i << "\"\n";
+ }
+
+ if (Subtarget->isTargetDarwin()) {
+ SwitchToDataSection("", 0);
// Output stubs for dynamically-linked functions
unsigned j = 1;
for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
i != e; ++i, ++j) {
- O << "\t.symbol_stub\n";
+ SwitchToDataSection(".section __IMPORT,__jump_table,symbol_stubs,"
+ "self_modifying_code+pure_instructions,5", 0);
O << "L" << *i << "$stub:\n";
O << "\t.indirect_symbol " << *i << "\n";
- O << "\tjmp\t*L" << j << "$lz\n";
- O << "L" << *i << "$stub_binder:\n";
- O << "\tpushl\t$L" << j << "$lz\n";
- O << "\tjmp\tdyld_stub_binding_helper\n";
- O << "\t.section __DATA, __la_sym_ptr3,lazy_symbol_pointers\n";
- O << "L" << j << "$lz:\n";
- O << "\t.indirect_symbol " << *i << "\n";
- O << "\t.long\tL" << *i << "$stub_binder\n";
+ O << "\thlt ; hlt ; hlt ; hlt ; hlt\n";
}
O << "\n";
- // Output stubs for link-once variables
- if (LinkOnceStubs.begin() != LinkOnceStubs.end())
- O << ".data\n.align 2\n";
- for (std::set<std::string>::iterator i = LinkOnceStubs.begin(),
- e = LinkOnceStubs.end(); i != e; ++i) {
- O << "L" << *i << "$non_lazy_ptr:\n"
- << "\t.long\t" << *i << '\n';
+ // Output stubs for external and common global variables.
+ if (GVStubs.begin() != GVStubs.end())
+ SwitchToDataSection(
+ ".section __IMPORT,__pointers,non_lazy_symbol_pointers", 0);
+ for (std::set<std::string>::iterator i = GVStubs.begin(), e = GVStubs.end();
+ i != e; ++i) {
+ O << "L" << *i << "$non_lazy_ptr:\n";
+ O << "\t.indirect_symbol " << *i << "\n";
+ O << "\t.long\t0\n";
}
+
+ // Emit final debug information.
+ DW.EndModule();
+
+ // Funny Darwin hack: This flag tells the linker that no global symbols
+ // contain code that falls through to other global symbols (e.g. the obvious
+ // implementation of multiple entry points). If this doesn't occur, the
+ // linker can safely perform dead code stripping. Since LLVM never
+ // generates code that does this, it is always safe to set.
+ O << "\t.subsections_via_symbols\n";
+ } else if (Subtarget->isTargetELF()) {
+ // Emit final debug information.
+ DW.EndModule();
}
AsmPrinter::doFinalization(M);
/// for a MachineFunction to the given output stream, using the given target
/// machine description.
///
-FunctionPass *llvm::createX86CodePrinterPass(std::ostream &o,TargetMachine &tm){
- switch (AsmWriterFlavor) {
- default:
- assert(0 && "Unknown asm flavor!");
- case intel:
- return new X86IntelAsmPrinter(o, tm);
- case att:
- return new X86ATTAsmPrinter(o, tm);
+FunctionPass *llvm::createX86CodePrinterPass(std::ostream &o,
+ X86TargetMachine &tm) {
+ const X86Subtarget *Subtarget = &tm.getSubtarget<X86Subtarget>();
+
+ if (Subtarget->isFlavorIntel()) {
+ return new X86IntelAsmPrinter(o, tm, tm.getTargetAsmInfo());
+ } else {
+ return new X86ATTAsmPrinter(o, tm, tm.getTargetAsmInfo());
}
}
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