//
//===----------------------------------------------------------------------===//
+#include "X86AsmPrinter.h"
#include "X86ATTAsmPrinter.h"
#include "X86IntelAsmPrinter.h"
-#include "X86.h"
+#include "X86Subtarget.h"
+#include "llvm/Constants.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/Assembly/Writer.h"
-#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/Support/Mangler.h"
-#include "llvm/Support/CommandLine.h"
+#include "llvm/Target/TargetAsmInfo.h"
using namespace llvm;
-using namespace x86;
-Statistic<> llvm::x86::EmittedInsts("asm-printer",
- "Number of machine instrs printed");
-
-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) {
- bool leadingUnderscore = false;
- forCygwin = false;
- const std::string& TT = M.getTargetTriple();
- if (TT.length() > 5) {
- forCygwin = TT.find("cygwin") != std::string::npos ||
- TT.find("mingw") != std::string::npos;
- forDarwin = TT.find("darwin") != std::string::npos;
- } else if (TT.empty()) {
-#if defined(__CYGWIN__) || defined(__MINGW32__)
- forCygwin = true;
-#elif defined(__APPLE__)
- forDarwin = true;
-#elif defined(_WIN32)
- leadingUnderscore = true;
-#else
- leadingUnderscore = false;
-#endif
- }
-
- if (leadingUnderscore || forCygwin || forDarwin)
- GlobalPrefix = "_";
-
- if (forDarwin) {
- AlignmentIsInBytes = false;
- 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
+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);
}
return AsmPrinter::doInitialization(M);
}
-/// printConstantPool - Print to the current output stream assembly
-/// representations of the constants in the constant pool MCP. This is
-/// used to print out constants which have been "spilled to memory" by
-/// the code generator.
-///
-void X86SharedAsmPrinter::printConstantPool(MachineConstantPool *MCP) {
- const std::vector<Constant*> &CP = MCP->getConstants();
- const TargetData &TD = TM.getTargetData();
-
- if (CP.empty()) return;
-
- if (forDarwin) {
- O << "\t.const\n";
- } else {
- O << "\t.section .rodata\n";
- }
-
- for (unsigned i = 0, e = CP.size(); i != e; ++i) {
- // FIXME: force doubles to be naturally aligned. We should handle this
- // more correctly in the future.
- if (CP[i]->getType() == Type::DoubleTy)
- emitAlignment(3);
- else
- emitAlignment(TD.getTypeAlignmentShift(CP[i]->getType()));
- O << PrivateGlobalPrefix << "CPI" << CurrentFnName << "_" << i
- << ":\t\t\t\t\t" << CommentString << *CP[i] << "\n";
- emitGlobalConstant(CP[i]);
- }
-}
-
bool X86SharedAsmPrinter::doFinalization(Module &M) {
- const TargetData &TD = TM.getTargetData();
- std::string CurSection;
+ // 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)
- if (I->hasInitializer()) { // External global require no code
- 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());
-
- if (C->isNullValue() &&
- (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
- I->hasWeakLinkage() /* FIXME: Verify correct */)) {
- switchSection(O, CurSection, ".data");
- if (!forCygwin && !forDarwin && I->hasInternalLinkage())
- O << "\t.local " << name << "\n";
- if (forDarwin && I->hasInternalLinkage())
- O << "\t.lcomm " << name << "," << Size << "," << Align;
- else
- O << "\t.comm " << name << "," << Size;
- if (!forCygwin && !forDarwin)
- O << "," << (1 << Align);
- O << "\t\t# ";
- WriteAsOperand(O, I, true, true, &M);
- O << "\n";
+ 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 so, emit it.
+ if (EmitSpecialLLVMGlobal(I))
+ continue;
+
+ std::string name = Mang->getValueName(I);
+ Constant *C = I->getInitializer();
+ unsigned Size = TD->getTypeSize(C->getType());
+ unsigned Align = getPreferredAlignmentLog(I);
+
+ if (C->isNullValue() && /* FIXME: Verify correct */
+ (I->hasInternalLinkage() || I->hasWeakLinkage() ||
+ I->hasLinkOnceLinkage() ||
+ (Subtarget->isTargetDarwin() &&
+ I->hasExternalLinkage() && !I->hasSection()))) {
+ 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 {
- switch (I->getLinkage()) {
- default: assert(0 && "Unknown linkage type!");
- case GlobalValue::LinkOnceLinkage:
- case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
- // Nonnull linkonce -> weak
- O << "\t.weak " << name << "\n";
- switchSection(O, CurSection, "");
- O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\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::ExternalLinkage:
- // If external or appending, declare as a global symbol
- O << "\t.globl " << name << "\n";
- // FALL THROUGH
- case GlobalValue::InternalLinkage:
- if (C->isNullValue())
- switchSection(O, CurSection, ".bss");
- else
- switchSection(O, CurSection, ".data");
- break;
+ 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->TargetType != X86Subtarget::isCygwin) {
+ if (I->hasInternalLinkage())
+ O << "\t.local\t" << name << "\n";
+ }
+ O << TAI->getCOMMDirective() << name << "," << Size;
+ if (TAI->getCOMMDirectiveTakesAlignment())
+ O << "," << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
}
-
- emitAlignment(Align);
- if (!forCygwin && !forDarwin) {
- O << "\t.type " << name << ",@object\n";
- O << "\t.size " << name << "," << Size << "\n";
+ }
+ 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->TargetType == X86Subtarget::isCygwin) {
+ O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\"\n"
+ << "\t.weak " << name << "\n";
+ } else {
+ O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n"
+ << "\t.weak " << name << "\n";
}
- O << name << ":\t\t\t\t# ";
- WriteAsOperand(O, I, true, true, &M);
- O << " = ";
- WriteAsOperand(O, C, false, false, &M);
- O << "\n";
- emitGlobalConstant(C);
+ 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:
+ SwitchToDataSection(TAI->getDataSection(), I);
+ 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";
+
+ EmitGlobalConstant(C);
+ O << '\n';
}
+ }
+
+ // Output linker support code for dllexported globals
+ if (DLLExportedGVs.begin() != DLLExportedGVs.end()) {
+ SwitchToDataSection(".section .drectve", 0);
+ }
- if (forDarwin) {
- // 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();
+ 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 initial 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";
}
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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