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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25572 91177308-0d34-0410-b5e6-96231b3b80d8
450 lines
16 KiB
C++
450 lines
16 KiB
C++
//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
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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 implements the AsmPrinter class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DerivedTypes.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/Constants.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Target/TargetMachine.h"
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#include <iostream>
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using namespace llvm;
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AsmPrinter::AsmPrinter(std::ostream &o, TargetMachine &tm)
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: FunctionNumber(0), O(o), TM(tm),
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CommentString("#"),
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GlobalPrefix(""),
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PrivateGlobalPrefix("."),
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GlobalVarAddrPrefix(""),
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GlobalVarAddrSuffix(""),
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FunctionAddrPrefix(""),
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FunctionAddrSuffix(""),
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ZeroDirective("\t.zero\t"),
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AsciiDirective("\t.ascii\t"),
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AscizDirective("\t.asciz\t"),
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Data8bitsDirective("\t.byte\t"),
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Data16bitsDirective("\t.short\t"),
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Data32bitsDirective("\t.long\t"),
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Data64bitsDirective("\t.quad\t"),
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AlignDirective("\t.align\t"),
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AlignmentIsInBytes(true),
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SwitchToSectionDirective("\t.section\t"),
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ConstantPoolSection("\t.section .rodata\n"),
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StaticCtorsSection("\t.section .ctors,\"aw\",@progbits"),
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StaticDtorsSection("\t.section .dtors,\"aw\",@progbits"),
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LCOMMDirective(0),
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COMMDirective("\t.comm\t"),
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COMMDirectiveTakesAlignment(true),
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HasDotTypeDotSizeDirective(true) {
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}
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/// SwitchSection - Switch to the specified section of the executable if we
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/// are not already in it!
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///
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void AsmPrinter::SwitchSection(const char *NewSection, const GlobalValue *GV) {
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std::string NS;
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if (GV && GV->hasSection())
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NS = SwitchToSectionDirective + GV->getSection();
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else
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NS = std::string("\t")+NewSection;
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if (CurrentSection != NS) {
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CurrentSection = NS;
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if (!CurrentSection.empty())
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O << CurrentSection << '\n';
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}
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}
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bool AsmPrinter::doInitialization(Module &M) {
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Mang = new Mangler(M, GlobalPrefix);
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if (!M.getModuleInlineAsm().empty())
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O << CommentString << " Start of file scope inline assembly\n"
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<< M.getModuleInlineAsm()
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<< "\n" << CommentString << " End of file scope inline assembly\n";
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SwitchSection("", 0); // Reset back to no section.
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return false;
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}
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bool AsmPrinter::doFinalization(Module &M) {
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delete Mang; Mang = 0;
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return false;
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}
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void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
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// What's my mangled name?
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CurrentFnName = Mang->getValueName(MF.getFunction());
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IncrementFunctionNumber();
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}
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/// EmitConstantPool - Print to the current output stream assembly
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/// representations of the constants in the constant pool MCP. This is
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/// used to print out constants which have been "spilled to memory" by
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/// the code generator.
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///
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void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
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const std::vector<Constant*> &CP = MCP->getConstants();
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if (CP.empty()) return;
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const TargetData &TD = TM.getTargetData();
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SwitchSection(ConstantPoolSection, 0);
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for (unsigned i = 0, e = CP.size(); i != e; ++i) {
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// FIXME: force doubles to be naturally aligned. We should handle this
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// more correctly in the future.
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unsigned Alignment = TD.getTypeAlignmentShift(CP[i]->getType());
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if (CP[i]->getType() == Type::DoubleTy && Alignment < 3) Alignment = 3;
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EmitAlignment(Alignment);
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O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << '_' << i
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<< ":\t\t\t\t\t" << CommentString << *CP[i] << '\n';
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EmitGlobalConstant(CP[i]);
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}
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}
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/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
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/// special global used by LLVM. If so, emit it and return true, otherwise
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/// do nothing and return false.
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bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
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assert(GV->hasInitializer() && GV->hasAppendingLinkage() &&
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"Not a special LLVM global!");
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if (GV->getName() == "llvm.used")
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return true; // No need to emit this at all.
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if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
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SwitchSection(StaticCtorsSection, 0);
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EmitAlignment(2, 0);
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EmitXXStructorList(GV->getInitializer());
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return true;
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}
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if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
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SwitchSection(StaticDtorsSection, 0);
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EmitAlignment(2, 0);
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EmitXXStructorList(GV->getInitializer());
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return true;
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}
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return false;
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}
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/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
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/// function pointers, ignoring the init priority.
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void AsmPrinter::EmitXXStructorList(Constant *List) {
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// Should be an array of '{ int, void ()* }' structs. The first value is the
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// init priority, which we ignore.
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if (!isa<ConstantArray>(List)) return;
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ConstantArray *InitList = cast<ConstantArray>(List);
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for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
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if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
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if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
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if (CS->getOperand(1)->isNullValue())
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return; // Found a null terminator, exit printing.
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// Emit the function pointer.
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EmitGlobalConstant(CS->getOperand(1));
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}
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}
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// EmitAlignment - Emit an alignment directive to the specified power of two.
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void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
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if (GV && GV->getAlignment())
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NumBits = Log2_32(GV->getAlignment());
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if (NumBits == 0) return; // No need to emit alignment.
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if (AlignmentIsInBytes) NumBits = 1 << NumBits;
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O << AlignDirective << NumBits << "\n";
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}
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/// EmitZeros - Emit a block of zeros.
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///
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void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
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if (NumZeros) {
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if (ZeroDirective)
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O << ZeroDirective << NumZeros << "\n";
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else {
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for (; NumZeros; --NumZeros)
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O << Data8bitsDirective << "0\n";
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}
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}
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}
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// Print out the specified constant, without a storage class. Only the
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// constants valid in constant expressions can occur here.
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void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
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if (CV->isNullValue() || isa<UndefValue>(CV))
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O << "0";
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else if (const ConstantBool *CB = dyn_cast<ConstantBool>(CV)) {
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assert(CB == ConstantBool::True);
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O << "1";
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} else if (const ConstantSInt *CI = dyn_cast<ConstantSInt>(CV))
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if (((CI->getValue() << 32) >> 32) == CI->getValue())
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O << CI->getValue();
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else
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O << (uint64_t)CI->getValue();
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else if (const ConstantUInt *CI = dyn_cast<ConstantUInt>(CV))
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O << CI->getValue();
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else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
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// This is a constant address for a global variable or function. Use the
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// name of the variable or function as the address value, possibly
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// decorating it with GlobalVarAddrPrefix/Suffix or
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// FunctionAddrPrefix/Suffix (these all default to "" )
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if (isa<Function>(GV))
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O << FunctionAddrPrefix << Mang->getValueName(GV) << FunctionAddrSuffix;
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else
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O << GlobalVarAddrPrefix << Mang->getValueName(GV) << GlobalVarAddrSuffix;
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} else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
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const TargetData &TD = TM.getTargetData();
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switch(CE->getOpcode()) {
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case Instruction::GetElementPtr: {
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// generate a symbolic expression for the byte address
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const Constant *ptrVal = CE->getOperand(0);
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std::vector<Value*> idxVec(CE->op_begin()+1, CE->op_end());
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if (int64_t Offset = TD.getIndexedOffset(ptrVal->getType(), idxVec)) {
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if (Offset)
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O << "(";
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EmitConstantValueOnly(ptrVal);
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if (Offset > 0)
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O << ") + " << Offset;
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else if (Offset < 0)
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O << ") - " << -Offset;
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} else {
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EmitConstantValueOnly(ptrVal);
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}
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break;
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}
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case Instruction::Cast: {
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// Support only non-converting or widening casts for now, that is, ones
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// that do not involve a change in value. This assertion is really gross,
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// and may not even be a complete check.
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Constant *Op = CE->getOperand(0);
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const Type *OpTy = Op->getType(), *Ty = CE->getType();
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// Remember, kids, pointers can be losslessly converted back and forth
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// into 32-bit or wider integers, regardless of signedness. :-P
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assert(((isa<PointerType>(OpTy)
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&& (Ty == Type::LongTy || Ty == Type::ULongTy
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|| Ty == Type::IntTy || Ty == Type::UIntTy))
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|| (isa<PointerType>(Ty)
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&& (OpTy == Type::LongTy || OpTy == Type::ULongTy
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|| OpTy == Type::IntTy || OpTy == Type::UIntTy))
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|| (((TD.getTypeSize(Ty) >= TD.getTypeSize(OpTy))
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&& OpTy->isLosslesslyConvertibleTo(Ty))))
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&& "FIXME: Don't yet support this kind of constant cast expr");
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EmitConstantValueOnly(Op);
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break;
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}
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case Instruction::Add:
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O << "(";
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EmitConstantValueOnly(CE->getOperand(0));
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O << ") + (";
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EmitConstantValueOnly(CE->getOperand(1));
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O << ")";
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break;
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default:
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assert(0 && "Unsupported operator!");
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}
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} else {
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assert(0 && "Unknown constant value!");
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}
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}
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/// toOctal - Convert the low order bits of X into an octal digit.
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///
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static inline char toOctal(int X) {
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return (X&7)+'0';
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}
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/// printAsCString - Print the specified array as a C compatible string, only if
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/// the predicate isString is true.
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///
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static void printAsCString(std::ostream &O, const ConstantArray *CVA,
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unsigned LastElt) {
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assert(CVA->isString() && "Array is not string compatible!");
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O << "\"";
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for (unsigned i = 0; i != LastElt; ++i) {
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unsigned char C =
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(unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getRawValue();
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if (C == '"') {
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O << "\\\"";
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} else if (C == '\\') {
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O << "\\\\";
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} else if (isprint(C)) {
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O << C;
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} else {
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switch(C) {
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case '\b': O << "\\b"; break;
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case '\f': O << "\\f"; break;
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case '\n': O << "\\n"; break;
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case '\r': O << "\\r"; break;
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case '\t': O << "\\t"; break;
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default:
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O << '\\';
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O << toOctal(C >> 6);
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O << toOctal(C >> 3);
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O << toOctal(C >> 0);
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break;
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}
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}
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}
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O << "\"";
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}
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/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
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///
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void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
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const TargetData &TD = TM.getTargetData();
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if (CV->isNullValue() || isa<UndefValue>(CV)) {
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EmitZeros(TD.getTypeSize(CV->getType()));
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return;
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} else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
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if (CVA->isString()) {
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unsigned NumElts = CVA->getNumOperands();
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if (AscizDirective && NumElts &&
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cast<ConstantInt>(CVA->getOperand(NumElts-1))->getRawValue() == 0) {
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O << AscizDirective;
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printAsCString(O, CVA, NumElts-1);
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} else {
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O << AsciiDirective;
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printAsCString(O, CVA, NumElts);
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}
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O << "\n";
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} else { // Not a string. Print the values in successive locations
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for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
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EmitGlobalConstant(CVA->getOperand(i));
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}
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return;
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} else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
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// Print the fields in successive locations. Pad to align if needed!
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const StructLayout *cvsLayout = TD.getStructLayout(CVS->getType());
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uint64_t sizeSoFar = 0;
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for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
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const Constant* field = CVS->getOperand(i);
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// Check if padding is needed and insert one or more 0s.
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uint64_t fieldSize = TD.getTypeSize(field->getType());
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uint64_t padSize = ((i == e-1? cvsLayout->StructSize
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: cvsLayout->MemberOffsets[i+1])
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- cvsLayout->MemberOffsets[i]) - fieldSize;
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sizeSoFar += fieldSize + padSize;
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// Now print the actual field value
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EmitGlobalConstant(field);
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// Insert the field padding unless it's zero bytes...
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EmitZeros(padSize);
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}
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assert(sizeSoFar == cvsLayout->StructSize &&
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"Layout of constant struct may be incorrect!");
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return;
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} else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
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// FP Constants are printed as integer constants to avoid losing
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// precision...
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double Val = CFP->getValue();
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if (CFP->getType() == Type::DoubleTy) {
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if (Data64bitsDirective)
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O << Data64bitsDirective << DoubleToBits(Val) << "\t" << CommentString
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<< " double value: " << Val << "\n";
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else if (TD.isBigEndian()) {
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O << Data32bitsDirective << unsigned(DoubleToBits(Val) >> 32)
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<< "\t" << CommentString << " double most significant word "
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<< Val << "\n";
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O << Data32bitsDirective << unsigned(DoubleToBits(Val))
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<< "\t" << CommentString << " double least significant word "
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<< Val << "\n";
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} else {
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O << Data32bitsDirective << unsigned(DoubleToBits(Val))
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<< "\t" << CommentString << " double least significant word " << Val
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<< "\n";
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O << Data32bitsDirective << unsigned(DoubleToBits(Val) >> 32)
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<< "\t" << CommentString << " double most significant word " << Val
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<< "\n";
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}
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return;
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} else {
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O << Data32bitsDirective << FloatToBits(Val) << "\t" << CommentString
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<< " float " << Val << "\n";
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return;
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}
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} else if (CV->getType() == Type::ULongTy || CV->getType() == Type::LongTy) {
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
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uint64_t Val = CI->getRawValue();
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if (Data64bitsDirective)
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O << Data64bitsDirective << Val << "\n";
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else if (TD.isBigEndian()) {
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O << Data32bitsDirective << unsigned(Val >> 32)
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<< "\t" << CommentString << " Double-word most significant word "
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<< Val << "\n";
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O << Data32bitsDirective << unsigned(Val)
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<< "\t" << CommentString << " Double-word least significant word "
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<< Val << "\n";
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} else {
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O << Data32bitsDirective << unsigned(Val)
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<< "\t" << CommentString << " Double-word least significant word "
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<< Val << "\n";
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O << Data32bitsDirective << unsigned(Val >> 32)
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<< "\t" << CommentString << " Double-word most significant word "
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<< Val << "\n";
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}
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return;
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}
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} else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(CV)) {
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const PackedType *PTy = CP->getType();
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for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
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EmitGlobalConstant(CP->getOperand(I));
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return;
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}
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const Type *type = CV->getType();
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switch (type->getTypeID()) {
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case Type::BoolTyID:
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case Type::UByteTyID: case Type::SByteTyID:
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O << Data8bitsDirective;
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break;
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case Type::UShortTyID: case Type::ShortTyID:
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O << Data16bitsDirective;
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break;
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case Type::PointerTyID:
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if (TD.getPointerSize() == 8) {
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O << Data64bitsDirective;
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break;
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}
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//Fall through for pointer size == int size
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case Type::UIntTyID: case Type::IntTyID:
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O << Data32bitsDirective;
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break;
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case Type::ULongTyID: case Type::LongTyID:
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assert(Data64bitsDirective &&"Target cannot handle 64-bit constant exprs!");
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O << Data64bitsDirective;
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break;
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case Type::FloatTyID: case Type::DoubleTyID:
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assert (0 && "Should have already output floating point constant.");
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default:
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assert (0 && "Can't handle printing this type of thing");
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break;
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}
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EmitConstantValueOnly(CV);
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O << "\n";
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}
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