mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33946 91177308-0d34-0410-b5e6-96231b3b80d8
1146 lines
39 KiB
C++
1146 lines
39 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/CodeGen/AsmPrinter.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/DerivedTypes.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/CodeGen/MachineJumpTableInfo.h"
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#include "llvm/Support/CommandLine.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/Support/Streams.h"
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#include "llvm/Target/TargetAsmInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/TargetMachine.h"
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#include <cerrno>
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using namespace llvm;
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static cl::opt<bool>
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AsmVerbose("asm-verbose", cl::Hidden, cl::desc("Add comments to directives."));
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AsmPrinter::AsmPrinter(std::ostream &o, TargetMachine &tm,
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const TargetAsmInfo *T)
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: FunctionNumber(0), O(o), TM(tm), TAI(T)
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{}
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std::string AsmPrinter::getSectionForFunction(const Function &F) const {
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return TAI->getTextSection();
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}
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/// SwitchToTextSection - Switch to the specified text section of the executable
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/// if we are not already in it!
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///
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void AsmPrinter::SwitchToTextSection(const char *NewSection,
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const GlobalValue *GV) {
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std::string NS;
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if (GV && GV->hasSection())
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NS = TAI->getSwitchToSectionDirective() + GV->getSection();
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else
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NS = NewSection;
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// If we're already in this section, we're done.
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if (CurrentSection == NS) return;
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// Close the current section, if applicable.
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if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
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O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << "\n";
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CurrentSection = NS;
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if (!CurrentSection.empty())
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O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n';
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}
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/// SwitchToDataSection - Switch to the specified data section of the executable
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/// if we are not already in it!
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///
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void AsmPrinter::SwitchToDataSection(const char *NewSection,
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const GlobalValue *GV) {
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std::string NS;
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if (GV && GV->hasSection())
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NS = TAI->getSwitchToSectionDirective() + GV->getSection();
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else
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NS = NewSection;
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// If we're already in this section, we're done.
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if (CurrentSection == NS) return;
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// Close the current section, if applicable.
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if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
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O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << "\n";
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CurrentSection = NS;
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if (!CurrentSection.empty())
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O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n';
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}
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bool AsmPrinter::doInitialization(Module &M) {
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Mang = new Mangler(M, TAI->getGlobalPrefix());
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if (!M.getModuleInlineAsm().empty())
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O << TAI->getCommentString() << " Start of file scope inline assembly\n"
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<< M.getModuleInlineAsm()
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<< "\n" << TAI->getCommentString()
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<< " End of file scope inline assembly\n";
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SwitchToDataSection(""); // Reset back to no section.
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if (MachineModuleInfo *MMI = getAnalysisToUpdate<MachineModuleInfo>()) {
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MMI->AnalyzeModule(M);
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}
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return false;
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}
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bool AsmPrinter::doFinalization(Module &M) {
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if (TAI->getWeakRefDirective()) {
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if (ExtWeakSymbols.begin() != ExtWeakSymbols.end())
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SwitchToDataSection("");
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for (std::set<const GlobalValue*>::iterator i = ExtWeakSymbols.begin(),
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e = ExtWeakSymbols.end(); i != e; ++i) {
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const GlobalValue *GV = *i;
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std::string Name = Mang->getValueName(GV);
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O << TAI->getWeakRefDirective() << Name << "\n";
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}
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}
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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<MachineConstantPoolEntry> &CP = MCP->getConstants();
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if (CP.empty()) return;
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// Some targets require 4-, 8-, and 16- byte constant literals to be placed
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// in special sections.
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std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs;
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std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs;
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std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs;
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std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs;
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std::vector<std::pair<MachineConstantPoolEntry,unsigned> > TargetCPs;
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for (unsigned i = 0, e = CP.size(); i != e; ++i) {
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MachineConstantPoolEntry CPE = CP[i];
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const Type *Ty = CPE.getType();
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if (TAI->getFourByteConstantSection() &&
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TM.getTargetData()->getTypeSize(Ty) == 4)
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FourByteCPs.push_back(std::make_pair(CPE, i));
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else if (TAI->getEightByteConstantSection() &&
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TM.getTargetData()->getTypeSize(Ty) == 8)
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EightByteCPs.push_back(std::make_pair(CPE, i));
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else if (TAI->getSixteenByteConstantSection() &&
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TM.getTargetData()->getTypeSize(Ty) == 16)
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SixteenByteCPs.push_back(std::make_pair(CPE, i));
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else
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OtherCPs.push_back(std::make_pair(CPE, i));
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}
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unsigned Alignment = MCP->getConstantPoolAlignment();
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EmitConstantPool(Alignment, TAI->getFourByteConstantSection(), FourByteCPs);
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EmitConstantPool(Alignment, TAI->getEightByteConstantSection(), EightByteCPs);
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EmitConstantPool(Alignment, TAI->getSixteenByteConstantSection(),
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SixteenByteCPs);
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EmitConstantPool(Alignment, TAI->getConstantPoolSection(), OtherCPs);
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}
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void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section,
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std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) {
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if (CP.empty()) return;
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SwitchToDataSection(Section);
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EmitAlignment(Alignment);
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for (unsigned i = 0, e = CP.size(); i != e; ++i) {
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O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
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<< CP[i].second << ":\t\t\t\t\t" << TAI->getCommentString() << " ";
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WriteTypeSymbolic(O, CP[i].first.getType(), 0) << '\n';
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if (CP[i].first.isMachineConstantPoolEntry())
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EmitMachineConstantPoolValue(CP[i].first.Val.MachineCPVal);
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else
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EmitGlobalConstant(CP[i].first.Val.ConstVal);
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if (i != e-1) {
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const Type *Ty = CP[i].first.getType();
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unsigned EntSize =
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TM.getTargetData()->getTypeSize(Ty);
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unsigned ValEnd = CP[i].first.getOffset() + EntSize;
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// Emit inter-object padding for alignment.
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EmitZeros(CP[i+1].first.getOffset()-ValEnd);
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}
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}
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}
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/// EmitJumpTableInfo - Print assembly representations of the jump tables used
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/// by the current function to the current output stream.
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///
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void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
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MachineFunction &MF) {
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const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
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if (JT.empty()) return;
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bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
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// Use JumpTableDirective otherwise honor the entry size from the jump table
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// info.
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const char *JTEntryDirective = TAI->getJumpTableDirective();
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bool HadJTEntryDirective = JTEntryDirective != NULL;
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if (!HadJTEntryDirective) {
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JTEntryDirective = MJTI->getEntrySize() == 4 ?
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TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
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}
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// Pick the directive to use to print the jump table entries, and switch to
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// the appropriate section.
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TargetLowering *LoweringInfo = TM.getTargetLowering();
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const char* JumpTableDataSection = TAI->getJumpTableDataSection();
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if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
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!JumpTableDataSection) {
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// In PIC mode, we need to emit the jump table to the same section as the
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// function body itself, otherwise the label differences won't make sense.
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// We should also do if the section name is NULL.
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const Function *F = MF.getFunction();
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SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
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} else {
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SwitchToDataSection(JumpTableDataSection);
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}
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EmitAlignment(Log2_32(MJTI->getAlignment()));
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for (unsigned i = 0, e = JT.size(); i != e; ++i) {
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const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
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// If this jump table was deleted, ignore it.
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if (JTBBs.empty()) continue;
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// For PIC codegen, if possible we want to use the SetDirective to reduce
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// the number of relocations the assembler will generate for the jump table.
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// Set directives are all printed before the jump table itself.
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std::set<MachineBasicBlock*> EmittedSets;
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if (TAI->getSetDirective() && IsPic)
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for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
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if (EmittedSets.insert(JTBBs[ii]).second)
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printSetLabel(i, JTBBs[ii]);
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// On some targets (e.g. darwin) we want to emit two consequtive labels
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// before each jump table. The first label is never referenced, but tells
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// the assembler and linker the extents of the jump table object. The
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// second label is actually referenced by the code.
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if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
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O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
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O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
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<< '_' << i << ":\n";
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for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
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O << JTEntryDirective << ' ';
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// If we have emitted set directives for the jump table entries, print
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// them rather than the entries themselves. If we're emitting PIC, then
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// emit the table entries as differences between two text section labels.
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// If we're emitting non-PIC code, then emit the entries as direct
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// references to the target basic blocks.
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if (!EmittedSets.empty()) {
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O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
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<< '_' << i << "_set_" << JTBBs[ii]->getNumber();
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} else if (IsPic) {
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printBasicBlockLabel(JTBBs[ii], false, false);
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// If the arch uses custom Jump Table directives, don't calc relative to
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// JT
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if (!HadJTEntryDirective)
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O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
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<< getFunctionNumber() << '_' << i;
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} else {
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printBasicBlockLabel(JTBBs[ii], false, false);
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}
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O << '\n';
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}
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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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// Ignore debug and non-emitted data.
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if (GV->getSection() == "llvm.metadata") return true;
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if (!GV->hasAppendingLinkage()) return false;
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assert(GV->hasInitializer() && "Not a special LLVM global!");
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if (GV->getName() == "llvm.used") {
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if (TAI->getUsedDirective() != 0) // No need to emit this at all.
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EmitLLVMUsedList(GV->getInitializer());
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return true;
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}
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if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
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SwitchToDataSection(TAI->getStaticCtorsSection());
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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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SwitchToDataSection(TAI->getStaticDtorsSection());
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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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/// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
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/// global in the specified llvm.used list as being used with this directive.
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void AsmPrinter::EmitLLVMUsedList(Constant *List) {
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const char *Directive = TAI->getUsedDirective();
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// Should be an array of 'sbyte*'.
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ConstantArray *InitList = dyn_cast<ConstantArray>(List);
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if (InitList == 0) return;
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for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
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O << Directive;
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EmitConstantValueOnly(InitList->getOperand(i));
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O << "\n";
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}
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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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/// getGlobalLinkName - Returns the asm/link name of of the specified
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/// global variable. Should be overridden by each target asm printer to
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/// generate the appropriate value.
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const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{
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std::string LinkName;
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if (isa<Function>(GV)) {
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LinkName += TAI->getFunctionAddrPrefix();
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LinkName += Mang->getValueName(GV);
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LinkName += TAI->getFunctionAddrSuffix();
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} else {
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LinkName += TAI->getGlobalVarAddrPrefix();
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LinkName += Mang->getValueName(GV);
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LinkName += TAI->getGlobalVarAddrSuffix();
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}
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return LinkName;
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}
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//===----------------------------------------------------------------------===//
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/// LEB 128 number encoding.
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/// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
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/// representing an unsigned leb128 value.
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void AsmPrinter::PrintULEB128(unsigned Value) const {
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do {
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unsigned Byte = Value & 0x7f;
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Value >>= 7;
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if (Value) Byte |= 0x80;
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O << "0x" << std::hex << Byte << std::dec;
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if (Value) O << ", ";
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} while (Value);
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}
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/// SizeULEB128 - Compute the number of bytes required for an unsigned leb128
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/// value.
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unsigned AsmPrinter::SizeULEB128(unsigned Value) {
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unsigned Size = 0;
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do {
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Value >>= 7;
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Size += sizeof(int8_t);
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} while (Value);
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return Size;
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}
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/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
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/// representing a signed leb128 value.
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void AsmPrinter::PrintSLEB128(int Value) const {
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int Sign = Value >> (8 * sizeof(Value) - 1);
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bool IsMore;
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do {
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unsigned Byte = Value & 0x7f;
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Value >>= 7;
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IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
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if (IsMore) Byte |= 0x80;
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O << "0x" << std::hex << Byte << std::dec;
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if (IsMore) O << ", ";
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} while (IsMore);
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}
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/// SizeSLEB128 - Compute the number of bytes required for a signed leb128
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/// value.
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unsigned AsmPrinter::SizeSLEB128(int Value) {
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unsigned Size = 0;
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int Sign = Value >> (8 * sizeof(Value) - 1);
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bool IsMore;
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do {
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unsigned Byte = Value & 0x7f;
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Value >>= 7;
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IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
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Size += sizeof(int8_t);
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} while (IsMore);
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return Size;
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}
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//===--------------------------------------------------------------------===//
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// Emission and print routines
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//
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/// PrintHex - Print a value as a hexidecimal value.
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///
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void AsmPrinter::PrintHex(int Value) const {
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O << "0x" << std::hex << Value << std::dec;
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}
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/// EOL - Print a newline character to asm stream. If a comment is present
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/// then it will be printed first. Comments should not contain '\n'.
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void AsmPrinter::EOL(const std::string &Comment) const {
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if (AsmVerbose && !Comment.empty()) {
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O << "\t"
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<< TAI->getCommentString()
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<< " "
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<< Comment;
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}
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O << "\n";
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}
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/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
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/// unsigned leb128 value.
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void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
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if (TAI->hasLEB128()) {
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O << "\t.uleb128\t"
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<< Value;
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} else {
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O << TAI->getData8bitsDirective();
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PrintULEB128(Value);
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}
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}
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/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
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/// signed leb128 value.
|
|
void AsmPrinter::EmitSLEB128Bytes(int Value) const {
|
|
if (TAI->hasLEB128()) {
|
|
O << "\t.sleb128\t"
|
|
<< Value;
|
|
} else {
|
|
O << TAI->getData8bitsDirective();
|
|
PrintSLEB128(Value);
|
|
}
|
|
}
|
|
|
|
/// EmitInt8 - Emit a byte directive and value.
|
|
///
|
|
void AsmPrinter::EmitInt8(int Value) const {
|
|
O << TAI->getData8bitsDirective();
|
|
PrintHex(Value & 0xFF);
|
|
}
|
|
|
|
/// EmitInt16 - Emit a short directive and value.
|
|
///
|
|
void AsmPrinter::EmitInt16(int Value) const {
|
|
O << TAI->getData16bitsDirective();
|
|
PrintHex(Value & 0xFFFF);
|
|
}
|
|
|
|
/// EmitInt32 - Emit a long directive and value.
|
|
///
|
|
void AsmPrinter::EmitInt32(int Value) const {
|
|
O << TAI->getData32bitsDirective();
|
|
PrintHex(Value);
|
|
}
|
|
|
|
/// EmitInt64 - Emit a long long directive and value.
|
|
///
|
|
void AsmPrinter::EmitInt64(uint64_t Value) const {
|
|
if (TAI->getData64bitsDirective()) {
|
|
O << TAI->getData64bitsDirective();
|
|
PrintHex(Value);
|
|
} else {
|
|
if (TM.getTargetData()->isBigEndian()) {
|
|
EmitInt32(unsigned(Value >> 32)); O << "\n";
|
|
EmitInt32(unsigned(Value));
|
|
} else {
|
|
EmitInt32(unsigned(Value)); O << "\n";
|
|
EmitInt32(unsigned(Value >> 32));
|
|
}
|
|
}
|
|
}
|
|
|
|
/// toOctal - Convert the low order bits of X into an octal digit.
|
|
///
|
|
static inline char toOctal(int X) {
|
|
return (X&7)+'0';
|
|
}
|
|
|
|
/// printStringChar - Print a char, escaped if necessary.
|
|
///
|
|
static void printStringChar(std::ostream &O, unsigned char C) {
|
|
if (C == '"') {
|
|
O << "\\\"";
|
|
} else if (C == '\\') {
|
|
O << "\\\\";
|
|
} else if (isprint(C)) {
|
|
O << C;
|
|
} else {
|
|
switch(C) {
|
|
case '\b': O << "\\b"; break;
|
|
case '\f': O << "\\f"; break;
|
|
case '\n': O << "\\n"; break;
|
|
case '\r': O << "\\r"; break;
|
|
case '\t': O << "\\t"; break;
|
|
default:
|
|
O << '\\';
|
|
O << toOctal(C >> 6);
|
|
O << toOctal(C >> 3);
|
|
O << toOctal(C >> 0);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// EmitString - Emit a string with quotes and a null terminator.
|
|
/// Special characters are emitted properly.
|
|
/// \literal (Eg. '\t') \endliteral
|
|
void AsmPrinter::EmitString(const std::string &String) const {
|
|
O << TAI->getAsciiDirective()
|
|
<< "\"";
|
|
for (unsigned i = 0, N = String.size(); i < N; ++i) {
|
|
unsigned char C = String[i];
|
|
printStringChar(O, C);
|
|
}
|
|
O << "\\0\"";
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// EmitAlignment - Emit an alignment directive to the specified power of two.
|
|
void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
|
|
if (GV && GV->getAlignment())
|
|
NumBits = Log2_32(GV->getAlignment());
|
|
if (NumBits == 0) return; // No need to emit alignment.
|
|
if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
|
|
O << TAI->getAlignDirective() << NumBits << "\n";
|
|
}
|
|
|
|
/// EmitZeros - Emit a block of zeros.
|
|
///
|
|
void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
|
|
if (NumZeros) {
|
|
if (TAI->getZeroDirective()) {
|
|
O << TAI->getZeroDirective() << NumZeros;
|
|
if (TAI->getZeroDirectiveSuffix())
|
|
O << TAI->getZeroDirectiveSuffix();
|
|
O << "\n";
|
|
} else {
|
|
for (; NumZeros; --NumZeros)
|
|
O << TAI->getData8bitsDirective() << "0\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
// Print out the specified constant, without a storage class. Only the
|
|
// constants valid in constant expressions can occur here.
|
|
void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
|
|
if (CV->isNullValue() || isa<UndefValue>(CV))
|
|
O << "0";
|
|
else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
|
|
O << CI->getZExtValue();
|
|
} else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
|
|
// This is a constant address for a global variable or function. Use the
|
|
// name of the variable or function as the address value, possibly
|
|
// decorating it with GlobalVarAddrPrefix/Suffix or
|
|
// FunctionAddrPrefix/Suffix (these all default to "" )
|
|
if (isa<Function>(GV)) {
|
|
O << TAI->getFunctionAddrPrefix()
|
|
<< Mang->getValueName(GV)
|
|
<< TAI->getFunctionAddrSuffix();
|
|
} else {
|
|
O << TAI->getGlobalVarAddrPrefix()
|
|
<< Mang->getValueName(GV)
|
|
<< TAI->getGlobalVarAddrSuffix();
|
|
}
|
|
} else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
|
|
const TargetData *TD = TM.getTargetData();
|
|
unsigned Opcode = CE->getOpcode();
|
|
switch (Opcode) {
|
|
case Instruction::GetElementPtr: {
|
|
// generate a symbolic expression for the byte address
|
|
const Constant *ptrVal = CE->getOperand(0);
|
|
std::vector<Value*> idxVec(CE->op_begin()+1, CE->op_end());
|
|
if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), idxVec)) {
|
|
if (Offset)
|
|
O << "(";
|
|
EmitConstantValueOnly(ptrVal);
|
|
if (Offset > 0)
|
|
O << ") + " << Offset;
|
|
else if (Offset < 0)
|
|
O << ") - " << -Offset;
|
|
} else {
|
|
EmitConstantValueOnly(ptrVal);
|
|
}
|
|
break;
|
|
}
|
|
case Instruction::Trunc:
|
|
case Instruction::ZExt:
|
|
case Instruction::SExt:
|
|
case Instruction::FPTrunc:
|
|
case Instruction::FPExt:
|
|
case Instruction::UIToFP:
|
|
case Instruction::SIToFP:
|
|
case Instruction::FPToUI:
|
|
case Instruction::FPToSI:
|
|
assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
|
|
break;
|
|
case Instruction::BitCast:
|
|
return EmitConstantValueOnly(CE->getOperand(0));
|
|
|
|
case Instruction::IntToPtr: {
|
|
// Handle casts to pointers by changing them into casts to the appropriate
|
|
// integer type. This promotes constant folding and simplifies this code.
|
|
Constant *Op = CE->getOperand(0);
|
|
Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
|
|
return EmitConstantValueOnly(Op);
|
|
}
|
|
|
|
|
|
case Instruction::PtrToInt: {
|
|
// Support only foldable casts to/from pointers that can be eliminated by
|
|
// changing the pointer to the appropriately sized integer type.
|
|
Constant *Op = CE->getOperand(0);
|
|
const Type *Ty = CE->getType();
|
|
|
|
// We can emit the pointer value into this slot if the slot is an
|
|
// integer slot greater or equal to the size of the pointer.
|
|
if (Ty->isInteger() &&
|
|
TD->getTypeSize(Ty) >= TD->getTypeSize(Op->getType()))
|
|
return EmitConstantValueOnly(Op);
|
|
|
|
assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
|
|
EmitConstantValueOnly(Op);
|
|
break;
|
|
}
|
|
case Instruction::Add:
|
|
case Instruction::Sub:
|
|
O << "(";
|
|
EmitConstantValueOnly(CE->getOperand(0));
|
|
O << (Opcode==Instruction::Add ? ") + (" : ") - (");
|
|
EmitConstantValueOnly(CE->getOperand(1));
|
|
O << ")";
|
|
break;
|
|
default:
|
|
assert(0 && "Unsupported operator!");
|
|
}
|
|
} else {
|
|
assert(0 && "Unknown constant value!");
|
|
}
|
|
}
|
|
|
|
/// printAsCString - Print the specified array as a C compatible string, only if
|
|
/// the predicate isString is true.
|
|
///
|
|
static void printAsCString(std::ostream &O, const ConstantArray *CVA,
|
|
unsigned LastElt) {
|
|
assert(CVA->isString() && "Array is not string compatible!");
|
|
|
|
O << "\"";
|
|
for (unsigned i = 0; i != LastElt; ++i) {
|
|
unsigned char C =
|
|
(unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
|
|
printStringChar(O, C);
|
|
}
|
|
O << "\"";
|
|
}
|
|
|
|
/// EmitString - Emit a zero-byte-terminated string constant.
|
|
///
|
|
void AsmPrinter::EmitString(const ConstantArray *CVA) const {
|
|
unsigned NumElts = CVA->getNumOperands();
|
|
if (TAI->getAscizDirective() && NumElts &&
|
|
cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
|
|
O << TAI->getAscizDirective();
|
|
printAsCString(O, CVA, NumElts-1);
|
|
} else {
|
|
O << TAI->getAsciiDirective();
|
|
printAsCString(O, CVA, NumElts);
|
|
}
|
|
O << "\n";
|
|
}
|
|
|
|
/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
|
|
///
|
|
void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
|
|
const TargetData *TD = TM.getTargetData();
|
|
|
|
if (CV->isNullValue() || isa<UndefValue>(CV)) {
|
|
EmitZeros(TD->getTypeSize(CV->getType()));
|
|
return;
|
|
} else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
|
|
if (CVA->isString()) {
|
|
EmitString(CVA);
|
|
} else { // Not a string. Print the values in successive locations
|
|
for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
|
|
EmitGlobalConstant(CVA->getOperand(i));
|
|
}
|
|
return;
|
|
} else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
|
|
// Print the fields in successive locations. Pad to align if needed!
|
|
const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
|
|
uint64_t sizeSoFar = 0;
|
|
for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
|
|
const Constant* field = CVS->getOperand(i);
|
|
|
|
// Check if padding is needed and insert one or more 0s.
|
|
uint64_t fieldSize = TD->getTypeSize(field->getType());
|
|
uint64_t padSize = ((i == e-1? cvsLayout->StructSize
|
|
: cvsLayout->MemberOffsets[i+1])
|
|
- cvsLayout->MemberOffsets[i]) - fieldSize;
|
|
sizeSoFar += fieldSize + padSize;
|
|
|
|
// Now print the actual field value
|
|
EmitGlobalConstant(field);
|
|
|
|
// Insert the field padding unless it's zero bytes...
|
|
EmitZeros(padSize);
|
|
}
|
|
assert(sizeSoFar == cvsLayout->StructSize &&
|
|
"Layout of constant struct may be incorrect!");
|
|
return;
|
|
} else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
|
|
// FP Constants are printed as integer constants to avoid losing
|
|
// precision...
|
|
double Val = CFP->getValue();
|
|
if (CFP->getType() == Type::DoubleTy) {
|
|
if (TAI->getData64bitsDirective())
|
|
O << TAI->getData64bitsDirective() << DoubleToBits(Val) << "\t"
|
|
<< TAI->getCommentString() << " double value: " << Val << "\n";
|
|
else if (TD->isBigEndian()) {
|
|
O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
|
|
<< "\t" << TAI->getCommentString()
|
|
<< " double most significant word " << Val << "\n";
|
|
O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
|
|
<< "\t" << TAI->getCommentString()
|
|
<< " double least significant word " << Val << "\n";
|
|
} else {
|
|
O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
|
|
<< "\t" << TAI->getCommentString()
|
|
<< " double least significant word " << Val << "\n";
|
|
O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
|
|
<< "\t" << TAI->getCommentString()
|
|
<< " double most significant word " << Val << "\n";
|
|
}
|
|
return;
|
|
} else {
|
|
O << TAI->getData32bitsDirective() << FloatToBits(Val)
|
|
<< "\t" << TAI->getCommentString() << " float " << Val << "\n";
|
|
return;
|
|
}
|
|
} else if (CV->getType() == Type::Int64Ty) {
|
|
if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
|
|
uint64_t Val = CI->getZExtValue();
|
|
|
|
if (TAI->getData64bitsDirective())
|
|
O << TAI->getData64bitsDirective() << Val << "\n";
|
|
else if (TD->isBigEndian()) {
|
|
O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
|
|
<< "\t" << TAI->getCommentString()
|
|
<< " Double-word most significant word " << Val << "\n";
|
|
O << TAI->getData32bitsDirective() << unsigned(Val)
|
|
<< "\t" << TAI->getCommentString()
|
|
<< " Double-word least significant word " << Val << "\n";
|
|
} else {
|
|
O << TAI->getData32bitsDirective() << unsigned(Val)
|
|
<< "\t" << TAI->getCommentString()
|
|
<< " Double-word least significant word " << Val << "\n";
|
|
O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
|
|
<< "\t" << TAI->getCommentString()
|
|
<< " Double-word most significant word " << Val << "\n";
|
|
}
|
|
return;
|
|
}
|
|
} else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(CV)) {
|
|
const PackedType *PTy = CP->getType();
|
|
|
|
for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
|
|
EmitGlobalConstant(CP->getOperand(I));
|
|
|
|
return;
|
|
}
|
|
|
|
const Type *type = CV->getType();
|
|
printDataDirective(type);
|
|
EmitConstantValueOnly(CV);
|
|
O << "\n";
|
|
}
|
|
|
|
void
|
|
AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
|
|
// Target doesn't support this yet!
|
|
abort();
|
|
}
|
|
|
|
/// PrintSpecial - Print information related to the specified machine instr
|
|
/// that is independent of the operand, and may be independent of the instr
|
|
/// itself. This can be useful for portably encoding the comment character
|
|
/// or other bits of target-specific knowledge into the asmstrings. The
|
|
/// syntax used is ${:comment}. Targets can override this to add support
|
|
/// for their own strange codes.
|
|
void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) {
|
|
if (!strcmp(Code, "private")) {
|
|
O << TAI->getPrivateGlobalPrefix();
|
|
} else if (!strcmp(Code, "comment")) {
|
|
O << TAI->getCommentString();
|
|
} else if (!strcmp(Code, "uid")) {
|
|
// Assign a unique ID to this machine instruction.
|
|
static const MachineInstr *LastMI = 0;
|
|
static const Function *F = 0;
|
|
static unsigned Counter = 0U-1;
|
|
|
|
// Comparing the address of MI isn't sufficient, because machineinstrs may
|
|
// be allocated to the same address across functions.
|
|
const Function *ThisF = MI->getParent()->getParent()->getFunction();
|
|
|
|
// If this is a new machine instruction, bump the counter.
|
|
if (LastMI != MI || F != ThisF) {
|
|
++Counter;
|
|
LastMI = MI;
|
|
F = ThisF;
|
|
}
|
|
O << Counter;
|
|
} else {
|
|
cerr << "Unknown special formatter '" << Code
|
|
<< "' for machine instr: " << *MI;
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
|
|
/// printInlineAsm - This method formats and prints the specified machine
|
|
/// instruction that is an inline asm.
|
|
void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
|
|
unsigned NumOperands = MI->getNumOperands();
|
|
|
|
// Count the number of register definitions.
|
|
unsigned NumDefs = 0;
|
|
for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
|
|
++NumDefs)
|
|
assert(NumDefs != NumOperands-1 && "No asm string?");
|
|
|
|
assert(MI->getOperand(NumDefs).isExternalSymbol() && "No asm string?");
|
|
|
|
// Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
|
|
const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
|
|
|
|
// If this asmstr is empty, don't bother printing the #APP/#NOAPP markers.
|
|
if (AsmStr[0] == 0) {
|
|
O << "\n"; // Tab already printed, avoid double indenting next instr.
|
|
return;
|
|
}
|
|
|
|
O << TAI->getInlineAsmStart() << "\n\t";
|
|
|
|
// The variant of the current asmprinter.
|
|
int AsmPrinterVariant = TAI->getAssemblerDialect();
|
|
|
|
int CurVariant = -1; // The number of the {.|.|.} region we are in.
|
|
const char *LastEmitted = AsmStr; // One past the last character emitted.
|
|
|
|
while (*LastEmitted) {
|
|
switch (*LastEmitted) {
|
|
default: {
|
|
// Not a special case, emit the string section literally.
|
|
const char *LiteralEnd = LastEmitted+1;
|
|
while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
|
|
*LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
|
|
++LiteralEnd;
|
|
if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
|
|
O.write(LastEmitted, LiteralEnd-LastEmitted);
|
|
LastEmitted = LiteralEnd;
|
|
break;
|
|
}
|
|
case '\n':
|
|
++LastEmitted; // Consume newline character.
|
|
O << "\n\t"; // Indent code with newline.
|
|
break;
|
|
case '$': {
|
|
++LastEmitted; // Consume '$' character.
|
|
bool Done = true;
|
|
|
|
// Handle escapes.
|
|
switch (*LastEmitted) {
|
|
default: Done = false; break;
|
|
case '$': // $$ -> $
|
|
if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
|
|
O << '$';
|
|
++LastEmitted; // Consume second '$' character.
|
|
break;
|
|
case '(': // $( -> same as GCC's { character.
|
|
++LastEmitted; // Consume '(' character.
|
|
if (CurVariant != -1) {
|
|
cerr << "Nested variants found in inline asm string: '"
|
|
<< AsmStr << "'\n";
|
|
exit(1);
|
|
}
|
|
CurVariant = 0; // We're in the first variant now.
|
|
break;
|
|
case '|':
|
|
++LastEmitted; // consume '|' character.
|
|
if (CurVariant == -1) {
|
|
cerr << "Found '|' character outside of variant in inline asm "
|
|
<< "string: '" << AsmStr << "'\n";
|
|
exit(1);
|
|
}
|
|
++CurVariant; // We're in the next variant.
|
|
break;
|
|
case ')': // $) -> same as GCC's } char.
|
|
++LastEmitted; // consume ')' character.
|
|
if (CurVariant == -1) {
|
|
cerr << "Found '}' character outside of variant in inline asm "
|
|
<< "string: '" << AsmStr << "'\n";
|
|
exit(1);
|
|
}
|
|
CurVariant = -1;
|
|
break;
|
|
}
|
|
if (Done) break;
|
|
|
|
bool HasCurlyBraces = false;
|
|
if (*LastEmitted == '{') { // ${variable}
|
|
++LastEmitted; // Consume '{' character.
|
|
HasCurlyBraces = true;
|
|
}
|
|
|
|
const char *IDStart = LastEmitted;
|
|
char *IDEnd;
|
|
errno = 0;
|
|
long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
|
|
if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
|
|
cerr << "Bad $ operand number in inline asm string: '"
|
|
<< AsmStr << "'\n";
|
|
exit(1);
|
|
}
|
|
LastEmitted = IDEnd;
|
|
|
|
char Modifier[2] = { 0, 0 };
|
|
|
|
if (HasCurlyBraces) {
|
|
// If we have curly braces, check for a modifier character. This
|
|
// supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
|
|
if (*LastEmitted == ':') {
|
|
++LastEmitted; // Consume ':' character.
|
|
if (*LastEmitted == 0) {
|
|
cerr << "Bad ${:} expression in inline asm string: '"
|
|
<< AsmStr << "'\n";
|
|
exit(1);
|
|
}
|
|
|
|
Modifier[0] = *LastEmitted;
|
|
++LastEmitted; // Consume modifier character.
|
|
}
|
|
|
|
if (*LastEmitted != '}') {
|
|
cerr << "Bad ${} expression in inline asm string: '"
|
|
<< AsmStr << "'\n";
|
|
exit(1);
|
|
}
|
|
++LastEmitted; // Consume '}' character.
|
|
}
|
|
|
|
if ((unsigned)Val >= NumOperands-1) {
|
|
cerr << "Invalid $ operand number in inline asm string: '"
|
|
<< AsmStr << "'\n";
|
|
exit(1);
|
|
}
|
|
|
|
// Okay, we finally have a value number. Ask the target to print this
|
|
// operand!
|
|
if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
|
|
unsigned OpNo = 1;
|
|
|
|
bool Error = false;
|
|
|
|
// Scan to find the machine operand number for the operand.
|
|
for (; Val; --Val) {
|
|
if (OpNo >= MI->getNumOperands()) break;
|
|
unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
|
|
OpNo += (OpFlags >> 3) + 1;
|
|
}
|
|
|
|
if (OpNo >= MI->getNumOperands()) {
|
|
Error = true;
|
|
} else {
|
|
unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
|
|
++OpNo; // Skip over the ID number.
|
|
|
|
AsmPrinter *AP = const_cast<AsmPrinter*>(this);
|
|
if ((OpFlags & 7) == 4 /*ADDR MODE*/) {
|
|
Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
|
|
Modifier[0] ? Modifier : 0);
|
|
} else {
|
|
Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
|
|
Modifier[0] ? Modifier : 0);
|
|
}
|
|
}
|
|
if (Error) {
|
|
cerr << "Invalid operand found in inline asm: '"
|
|
<< AsmStr << "'\n";
|
|
MI->dump();
|
|
exit(1);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
O << "\n\t" << TAI->getInlineAsmEnd() << "\n";
|
|
}
|
|
|
|
/// printLabel - This method prints a local label used by debug and
|
|
/// exception handling tables.
|
|
void AsmPrinter::printLabel(const MachineInstr *MI) const {
|
|
O << "\n"
|
|
<< TAI->getPrivateGlobalPrefix()
|
|
<< "label_"
|
|
<< MI->getOperand(0).getImmedValue()
|
|
<< ":\n";
|
|
}
|
|
|
|
/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
|
|
/// instruction, using the specified assembler variant. Targets should
|
|
/// overried this to format as appropriate.
|
|
bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
|
|
unsigned AsmVariant, const char *ExtraCode) {
|
|
// Target doesn't support this yet!
|
|
return true;
|
|
}
|
|
|
|
bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
|
|
unsigned AsmVariant,
|
|
const char *ExtraCode) {
|
|
// Target doesn't support this yet!
|
|
return true;
|
|
}
|
|
|
|
/// printBasicBlockLabel - This method prints the label for the specified
|
|
/// MachineBasicBlock
|
|
void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
|
|
bool printColon,
|
|
bool printComment) const {
|
|
O << TAI->getPrivateGlobalPrefix() << "BB" << FunctionNumber << "_"
|
|
<< MBB->getNumber();
|
|
if (printColon)
|
|
O << ':';
|
|
if (printComment && MBB->getBasicBlock())
|
|
O << '\t' << TAI->getCommentString() << MBB->getBasicBlock()->getName();
|
|
}
|
|
|
|
/// printSetLabel - This method prints a set label for the specified
|
|
/// MachineBasicBlock
|
|
void AsmPrinter::printSetLabel(unsigned uid,
|
|
const MachineBasicBlock *MBB) const {
|
|
if (!TAI->getSetDirective())
|
|
return;
|
|
|
|
O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
|
|
<< getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
|
|
printBasicBlockLabel(MBB, false, false);
|
|
O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
|
|
<< '_' << uid << '\n';
|
|
}
|
|
|
|
void AsmPrinter::printSetLabel(unsigned uid, unsigned uid2,
|
|
const MachineBasicBlock *MBB) const {
|
|
if (!TAI->getSetDirective())
|
|
return;
|
|
|
|
O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
|
|
<< getFunctionNumber() << '_' << uid << '_' << uid2
|
|
<< "_set_" << MBB->getNumber() << ',';
|
|
printBasicBlockLabel(MBB, false, false);
|
|
O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
|
|
<< '_' << uid << '_' << uid2 << '\n';
|
|
}
|
|
|
|
/// printDataDirective - This method prints the asm directive for the
|
|
/// specified type.
|
|
void AsmPrinter::printDataDirective(const Type *type) {
|
|
const TargetData *TD = TM.getTargetData();
|
|
switch (type->getTypeID()) {
|
|
case Type::IntegerTyID: {
|
|
unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
|
|
if (BitWidth <= 8)
|
|
O << TAI->getData8bitsDirective();
|
|
else if (BitWidth <= 16)
|
|
O << TAI->getData16bitsDirective();
|
|
else if (BitWidth <= 32)
|
|
O << TAI->getData32bitsDirective();
|
|
else if (BitWidth <= 64) {
|
|
assert(TAI->getData64bitsDirective() &&
|
|
"Target cannot handle 64-bit constant exprs!");
|
|
O << TAI->getData64bitsDirective();
|
|
}
|
|
break;
|
|
}
|
|
case Type::PointerTyID:
|
|
if (TD->getPointerSize() == 8) {
|
|
assert(TAI->getData64bitsDirective() &&
|
|
"Target cannot handle 64-bit pointer exprs!");
|
|
O << TAI->getData64bitsDirective();
|
|
} else {
|
|
O << TAI->getData32bitsDirective();
|
|
}
|
|
break;
|
|
case Type::FloatTyID: case Type::DoubleTyID:
|
|
assert (0 && "Should have already output floating point constant.");
|
|
default:
|
|
assert (0 && "Can't handle printing this type of thing");
|
|
break;
|
|
}
|
|
}
|