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https://github.com/c64scene-ar/llvm-6502.git
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b74ed07bfd
DLL* linkages got full (I hope) codegeneration support in C & both x86 assembler backends. External weak linkage added for future use, we don't provide any codegeneration, etc. support for it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30374 91177308-0d34-0410-b5e6-96231b3b80d8
217 lines
8.0 KiB
C++
217 lines
8.0 KiB
C++
//===-- X86AsmPrinter.cpp - Convert X86 LLVM IR to X86 assembly -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file the shared super class printer that converts from our internal
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// representation of machine-dependent LLVM code to Intel and AT&T format
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// assembly language.
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// This printer is the output mechanism used by `llc'.
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//
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//===----------------------------------------------------------------------===//
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#include "X86AsmPrinter.h"
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#include "X86ATTAsmPrinter.h"
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#include "X86IntelAsmPrinter.h"
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#include "X86Subtarget.h"
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#include "llvm/Constants.h"
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#include "llvm/Module.h"
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#include "llvm/Type.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Target/TargetAsmInfo.h"
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using namespace llvm;
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Statistic<> llvm::EmittedInsts("asm-printer",
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"Number of machine instrs printed");
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/// doInitialization
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bool X86SharedAsmPrinter::doInitialization(Module &M) {
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if (Subtarget->isTargetDarwin()) {
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const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
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if (!Subtarget->is64Bit())
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X86PICStyle = PICStyle::Stub;
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// Emit initial debug information.
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DW.BeginModule(&M);
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}
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return AsmPrinter::doInitialization(M);
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}
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bool X86SharedAsmPrinter::doFinalization(Module &M) {
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// Note: this code is not shared by the Intel printer as it is too different
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// from how MASM does things. When making changes here don't forget to look
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// at X86IntelAsmPrinter::doFinalization().
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const TargetData *TD = TM.getTargetData();
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// Print out module-level global variables here.
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for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
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I != E; ++I) {
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if (!I->hasInitializer()) continue; // External global require no code
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// Check to see if this is a special global used by LLVM, if so, emit it.
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if (EmitSpecialLLVMGlobal(I))
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continue;
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std::string name = Mang->getValueName(I);
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Constant *C = I->getInitializer();
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unsigned Size = TD->getTypeSize(C->getType());
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unsigned Align = getPreferredAlignmentLog(I);
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if (C->isNullValue() && /* FIXME: Verify correct */
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(I->hasInternalLinkage() || I->hasWeakLinkage() ||
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I->hasLinkOnceLinkage() ||
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(Subtarget->isTargetDarwin() &&
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I->hasExternalLinkage() && !I->hasSection()))) {
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if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
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if (I->hasExternalLinkage()) {
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O << "\t.globl\t" << name << "\n";
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O << "\t.zerofill __DATA__, __common, " << name << ", "
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<< Size << ", " << Align;
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} else {
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SwitchToDataSection(TAI->getDataSection(), I);
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if (TAI->getLCOMMDirective() != NULL) {
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if (I->hasInternalLinkage()) {
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O << TAI->getLCOMMDirective() << name << "," << Size;
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if (Subtarget->isTargetDarwin())
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O << "," << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
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} else
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O << TAI->getCOMMDirective() << name << "," << Size;
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} else {
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if (Subtarget->TargetType != X86Subtarget::isCygwin) {
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if (I->hasInternalLinkage())
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O << "\t.local\t" << name << "\n";
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}
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O << TAI->getCOMMDirective() << name << "," << Size;
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if (TAI->getCOMMDirectiveTakesAlignment())
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O << "," << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
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}
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}
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O << "\t\t" << TAI->getCommentString() << " " << I->getName() << "\n";
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} else {
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switch (I->getLinkage()) {
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case GlobalValue::LinkOnceLinkage:
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case GlobalValue::WeakLinkage:
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if (Subtarget->isTargetDarwin()) {
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O << "\t.globl " << name << "\n"
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<< "\t.weak_definition " << name << "\n";
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SwitchToDataSection(".section __DATA,__const_coal,coalesced", I);
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} else if (Subtarget->TargetType == X86Subtarget::isCygwin) {
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O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\"\n"
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<< "\t.weak " << name << "\n";
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} else {
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O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n"
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<< "\t.weak " << name << "\n";
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}
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break;
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case GlobalValue::AppendingLinkage:
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// FIXME: appending linkage variables should go into a section of
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// their name or something. For now, just emit them as external.
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case GlobalValue::DLLExportLinkage:
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DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
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// FALL THROUGH
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case GlobalValue::ExternalLinkage:
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// If external or appending, declare as a global symbol
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O << "\t.globl " << name << "\n";
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// FALL THROUGH
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case GlobalValue::InternalLinkage:
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SwitchToDataSection(TAI->getDataSection(), I);
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break;
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default:
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assert(0 && "Unknown linkage type!");
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}
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EmitAlignment(Align, I);
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O << name << ":\t\t\t\t" << TAI->getCommentString() << " " << I->getName()
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<< "\n";
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if (TAI->hasDotTypeDotSizeDirective())
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O << "\t.size " << name << ", " << Size << "\n";
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EmitGlobalConstant(C);
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O << '\n';
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}
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}
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// Output linker support code for dllexported globals
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if (DLLExportedGVs.begin() != DLLExportedGVs.end()) {
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SwitchToDataSection(".section .drectve", 0);
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}
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for (std::set<std::string>::iterator i = DLLExportedGVs.begin(),
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e = DLLExportedGVs.end();
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i != e; ++i) {
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O << "\t.ascii \" -export:" << *i << ",data\"\n";
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}
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if (DLLExportedFns.begin() != DLLExportedFns.end()) {
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SwitchToDataSection(".section .drectve", 0);
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}
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for (std::set<std::string>::iterator i = DLLExportedFns.begin(),
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e = DLLExportedFns.end();
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i != e; ++i) {
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O << "\t.ascii \" -export:" << *i << "\"\n";
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}
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if (Subtarget->isTargetDarwin()) {
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SwitchToDataSection("", 0);
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// Output stubs for dynamically-linked functions
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unsigned j = 1;
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for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
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i != e; ++i, ++j) {
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SwitchToDataSection(".section __IMPORT,__jump_table,symbol_stubs,"
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"self_modifying_code+pure_instructions,5", 0);
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O << "L" << *i << "$stub:\n";
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O << "\t.indirect_symbol " << *i << "\n";
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O << "\thlt ; hlt ; hlt ; hlt ; hlt\n";
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}
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O << "\n";
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// Output stubs for external and common global variables.
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if (GVStubs.begin() != GVStubs.end())
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SwitchToDataSection(
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".section __IMPORT,__pointers,non_lazy_symbol_pointers", 0);
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for (std::set<std::string>::iterator i = GVStubs.begin(), e = GVStubs.end();
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i != e; ++i) {
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O << "L" << *i << "$non_lazy_ptr:\n";
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O << "\t.indirect_symbol " << *i << "\n";
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O << "\t.long\t0\n";
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}
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// Emit initial debug information.
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DW.EndModule();
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// Funny Darwin hack: This flag tells the linker that no global symbols
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// contain code that falls through to other global symbols (e.g. the obvious
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// implementation of multiple entry points). If this doesn't occur, the
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// linker can safely perform dead code stripping. Since LLVM never
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// generates code that does this, it is always safe to set.
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O << "\t.subsections_via_symbols\n";
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}
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AsmPrinter::doFinalization(M);
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return false; // success
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}
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/// createX86CodePrinterPass - Returns a pass that prints the X86 assembly code
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/// for a MachineFunction to the given output stream, using the given target
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/// machine description.
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///
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FunctionPass *llvm::createX86CodePrinterPass(std::ostream &o,
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X86TargetMachine &tm) {
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const X86Subtarget *Subtarget = &tm.getSubtarget<X86Subtarget>();
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if (Subtarget->isFlavorIntel()) {
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return new X86IntelAsmPrinter(o, tm, tm.getTargetAsmInfo());
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} else {
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return new X86ATTAsmPrinter(o, tm, tm.getTargetAsmInfo());
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}
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}
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