#include "llvm/Constants.h"
#include "llvm/Module.h"
#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/MathExtras.h"
+#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include <iostream>
#include <cerrno>
GlobalVarAddrSuffix(""),
FunctionAddrPrefix(""),
FunctionAddrSuffix(""),
- InlineAsmStart("#APP\n"),
- InlineAsmEnd("#NO_APP\n"),
+ InlineAsmStart("#APP"),
+ InlineAsmEnd("#NO_APP"),
ZeroDirective("\t.zero\t"),
+ ZeroDirectiveSuffix(0),
AsciiDirective("\t.ascii\t"),
AscizDirective("\t.asciz\t"),
Data8bitsDirective("\t.byte\t"),
AlignDirective("\t.align\t"),
AlignmentIsInBytes(true),
SwitchToSectionDirective("\t.section\t"),
+ TextSectionStartSuffix(""),
+ DataSectionStartSuffix(""),
+ SectionEndDirectiveSuffix(0),
ConstantPoolSection("\t.section .rodata\n"),
+ JumpTableDataSection("\t.section .rodata\n"),
+ JumpTableTextSection("\t.text\n"),
StaticCtorsSection("\t.section .ctors,\"aw\",@progbits"),
StaticDtorsSection("\t.section .dtors,\"aw\",@progbits"),
+ FourByteConstantSection(0),
+ EightByteConstantSection(0),
+ SixteenByteConstantSection(0),
+ SetDirective(0),
LCOMMDirective(0),
COMMDirective("\t.comm\t"),
COMMDirectiveTakesAlignment(true),
}
-/// SwitchSection - Switch to the specified section of the executable if we
-/// are not already in it!
+/// SwitchToTextSection - Switch to the specified text section of the executable
+/// if we are not already in it!
///
-void AsmPrinter::SwitchSection(const char *NewSection, const GlobalValue *GV) {
+void AsmPrinter::SwitchToTextSection(const char *NewSection,
+ const GlobalValue *GV) {
std::string NS;
+ if (GV && GV->hasSection())
+ NS = SwitchToSectionDirective + GV->getSection();
+ else
+ NS = NewSection;
+ // If we're already in this section, we're done.
+ if (CurrentSection == NS) return;
+
+ // Close the current section, if applicable.
+ if (SectionEndDirectiveSuffix && !CurrentSection.empty())
+ O << CurrentSection << SectionEndDirectiveSuffix << "\n";
+
+ CurrentSection = NS;
+
+ if (!CurrentSection.empty())
+ O << CurrentSection << TextSectionStartSuffix << '\n';
+}
+
+/// SwitchToDataSection - Switch to the specified data section of the executable
+/// if we are not already in it!
+///
+void AsmPrinter::SwitchToDataSection(const char *NewSection,
+ const GlobalValue *GV) {
+ std::string NS;
if (GV && GV->hasSection())
NS = SwitchToSectionDirective + GV->getSection();
else
- NS = std::string("\t")+NewSection;
+ NS = NewSection;
- if (CurrentSection != NS) {
- CurrentSection = NS;
- if (!CurrentSection.empty())
- O << CurrentSection << '\n';
- }
+ // If we're already in this section, we're done.
+ if (CurrentSection == NS) return;
+
+ // Close the current section, if applicable.
+ if (SectionEndDirectiveSuffix && !CurrentSection.empty())
+ O << CurrentSection << SectionEndDirectiveSuffix << "\n";
+
+ CurrentSection = NS;
+
+ if (!CurrentSection.empty())
+ O << CurrentSection << DataSectionStartSuffix << '\n';
}
+
bool AsmPrinter::doInitialization(Module &M) {
Mang = new Mangler(M, GlobalPrefix);
<< M.getModuleInlineAsm()
<< "\n" << CommentString << " End of file scope inline assembly\n";
- SwitchSection("", 0); // Reset back to no section.
+ SwitchToDataSection("", 0); // Reset back to no section.
if (MachineDebugInfo *DebugInfo = getAnalysisToUpdate<MachineDebugInfo>()) {
DebugInfo->AnalyzeModule(M);
void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
if (CP.empty()) return;
- const TargetData &TD = TM.getTargetData();
-
- SwitchSection(ConstantPoolSection, 0);
- EmitAlignment(MCP->getConstantPoolAlignment());
+
+ // Some targets require 4-, 8-, and 16- byte constant literals to be placed
+ // in special sections.
+ std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs;
+ std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs;
+ std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs;
+ std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs;
for (unsigned i = 0, e = CP.size(); i != e; ++i) {
- O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << '_' << i
- << ":\t\t\t\t\t" << CommentString << " ";
- WriteTypeSymbolic(O, CP[i].Val->getType(), 0) << '\n';
- EmitGlobalConstant(CP[i].Val);
+ MachineConstantPoolEntry CPE = CP[i];
+ const Constant *CV = CPE.Val;
+ const Type *Ty = CV->getType();
+ if (FourByteConstantSection &&
+ TM.getTargetData()->getTypeSize(Ty) == 4)
+ FourByteCPs.push_back(std::make_pair(CPE, i));
+ else if (EightByteConstantSection &&
+ TM.getTargetData()->getTypeSize(Ty) == 8)
+ EightByteCPs.push_back(std::make_pair(CPE, i));
+ else if (SixteenByteConstantSection &&
+ TM.getTargetData()->getTypeSize(Ty) == 16)
+ SixteenByteCPs.push_back(std::make_pair(CPE, i));
+ else
+ OtherCPs.push_back(std::make_pair(CPE, i));
+ }
+
+ unsigned Alignment = MCP->getConstantPoolAlignment();
+ EmitConstantPool(Alignment, FourByteConstantSection, FourByteCPs);
+ EmitConstantPool(Alignment, EightByteConstantSection, EightByteCPs);
+ EmitConstantPool(Alignment, SixteenByteConstantSection, SixteenByteCPs);
+ EmitConstantPool(Alignment, ConstantPoolSection, OtherCPs);
+}
+
+void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section,
+ std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) {
+ if (CP.empty()) return;
+
+ SwitchToDataSection(Section, 0);
+ EmitAlignment(Alignment);
+ for (unsigned i = 0, e = CP.size(); i != e; ++i) {
+ O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << '_'
+ << CP[i].second << ":\t\t\t\t\t" << CommentString << " ";
+ WriteTypeSymbolic(O, CP[i].first.Val->getType(), 0) << '\n';
+ EmitGlobalConstant(CP[i].first.Val);
if (i != e-1) {
- unsigned EntSize = TM.getTargetData().getTypeSize(CP[i].Val->getType());
- unsigned ValEnd = CP[i].Offset + EntSize;
+ unsigned EntSize =
+ TM.getTargetData()->getTypeSize(CP[i].first.Val->getType());
+ unsigned ValEnd = CP[i].first.Offset + EntSize;
// Emit inter-object padding for alignment.
- EmitZeros(CP[i+1].Offset-ValEnd);
+ EmitZeros(CP[i+1].first.Offset-ValEnd);
+ }
+ }
+}
+
+/// EmitJumpTableInfo - Print assembly representations of the jump tables used
+/// by the current function to the current output stream.
+///
+void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI) {
+ const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
+ if (JT.empty()) return;
+ const TargetData *TD = TM.getTargetData();
+
+ // JTEntryDirective is a string to print sizeof(ptr) for non-PIC jump tables,
+ // and 32 bits for PIC since PIC jump table entries are differences, not
+ // pointers to blocks.
+ const char *JTEntryDirective = Data32bitsDirective;
+
+ // Pick the directive to use to print the jump table entries, and switch to
+ // the appropriate section.
+ if (TM.getRelocationModel() == Reloc::PIC_) {
+ SwitchToTextSection(JumpTableTextSection, 0);
+ } else {
+ SwitchToDataSection(JumpTableDataSection, 0);
+ if (TD->getPointerSize() == 8)
+ JTEntryDirective = Data64bitsDirective;
+ }
+ EmitAlignment(Log2_32(TD->getPointerAlignment()));
+
+ for (unsigned i = 0, e = JT.size(); i != e; ++i) {
+ const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
+
+ // For PIC codegen, if possible we want to use the SetDirective to reduce
+ // the number of relocations the assembler will generate for the jump table.
+ // Set directives are all printed before the jump table itself.
+ std::set<MachineBasicBlock*> EmittedSets;
+ if (SetDirective && TM.getRelocationModel() == Reloc::PIC_)
+ for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
+ if (EmittedSets.insert(JTBBs[ii]).second)
+ printSetLabel(i, JTBBs[ii]);
+
+ O << PrivateGlobalPrefix << "JTI" << getFunctionNumber() << '_' << i
+ << ":\n";
+
+ for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
+ O << JTEntryDirective << ' ';
+ // If we have emitted set directives for the jump table entries, print
+ // them rather than the entries themselves. If we're emitting PIC, then
+ // emit the table entries as differences between two text section labels.
+ // If we're emitting non-PIC code, then emit the entries as direct
+ // references to the target basic blocks.
+ if (!EmittedSets.empty()) {
+ O << PrivateGlobalPrefix << getFunctionNumber() << '_' << i << "_set_"
+ << JTBBs[ii]->getNumber();
+ } else if (TM.getRelocationModel() == Reloc::PIC_) {
+ printBasicBlockLabel(JTBBs[ii], false, false);
+ O << '-' << PrivateGlobalPrefix << "JTI" << getFunctionNumber()
+ << '_' << i;
+ } else {
+ printBasicBlockLabel(JTBBs[ii], false, false);
+ }
+ O << '\n';
}
}
}
/// special global used by LLVM. If so, emit it and return true, otherwise
/// do nothing and return false.
bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
- assert(GV->hasInitializer() && GV->hasAppendingLinkage() &&
- "Not a special LLVM global!");
+ // Ignore debug and non-emitted data.
+ if (GV->getSection() == "llvm.metadata") return true;
+
+ if (!GV->hasAppendingLinkage()) return false;
+
+ assert(GV->hasInitializer() && "Not a special LLVM global!");
if (GV->getName() == "llvm.used")
return true; // No need to emit this at all.
if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
- SwitchSection(StaticCtorsSection, 0);
+ SwitchToDataSection(StaticCtorsSection, 0);
EmitAlignment(2, 0);
EmitXXStructorList(GV->getInitializer());
return true;
}
if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
- SwitchSection(StaticDtorsSection, 0);
+ SwitchToDataSection(StaticDtorsSection, 0);
EmitAlignment(2, 0);
EmitXXStructorList(GV->getInitializer());
return true;
/// specified global, returned in log form. This includes an explicitly
/// requested alignment (if the global has one).
unsigned AsmPrinter::getPreferredAlignmentLog(const GlobalVariable *GV) const {
- unsigned Alignment = TM.getTargetData().getTypeAlignmentShift(GV->getType());
+ const Type *ElemType = GV->getType()->getElementType();
+ unsigned Alignment = TM.getTargetData()->getTypeAlignmentShift(ElemType);
if (GV->getAlignment() > (1U << Alignment))
Alignment = Log2_32(GV->getAlignment());
if (Alignment < 4) {
// If the global is not external, see if it is large. If so, give it a
// larger alignment.
- if (TM.getTargetData().getTypeSize(GV->getType()->getElementType()) > 128)
+ if (TM.getTargetData()->getTypeSize(ElemType) > 128)
Alignment = 4; // 16-byte alignment.
}
}
///
void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
if (NumZeros) {
- if (ZeroDirective)
- O << ZeroDirective << NumZeros << "\n";
- else {
+ if (ZeroDirective) {
+ O << ZeroDirective << NumZeros;
+ if (ZeroDirectiveSuffix)
+ O << ZeroDirectiveSuffix;
+ O << "\n";
+ } else {
for (; NumZeros; --NumZeros)
O << Data8bitsDirective << "0\n";
}
else
O << GlobalVarAddrPrefix << Mang->getValueName(GV) << GlobalVarAddrSuffix;
} else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
- const TargetData &TD = TM.getTargetData();
+ const TargetData *TD = TM.getTargetData();
switch(CE->getOpcode()) {
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 (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), idxVec)) {
if (Offset)
O << "(";
EmitConstantValueOnly(ptrVal);
break;
}
case Instruction::Cast: {
- // Support only non-converting or widening casts for now, that is, ones
- // that do not involve a change in value. This assertion is really gross,
- // and may not even be a complete check.
+ // 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 *OpTy = Op->getType(), *Ty = CE->getType();
- // Remember, kids, pointers can be losslessly converted back and forth
- // into 32-bit or wider integers, regardless of signedness. :-P
- assert(((isa<PointerType>(OpTy)
- && (Ty == Type::LongTy || Ty == Type::ULongTy
- || Ty == Type::IntTy || Ty == Type::UIntTy))
- || (isa<PointerType>(Ty)
- && (OpTy == Type::LongTy || OpTy == Type::ULongTy
- || OpTy == Type::IntTy || OpTy == Type::UIntTy))
- || (((TD.getTypeSize(Ty) >= TD.getTypeSize(OpTy))
- && OpTy->isLosslesslyConvertibleTo(Ty))))
- && "FIXME: Don't yet support this kind of constant cast expr");
+ // Handle casts to pointers by changing them into casts to the appropriate
+ // integer type. This promotes constant folding and simplifies this code.
+ if (isa<PointerType>(Ty)) {
+ const Type *IntPtrTy = TD->getIntPtrType();
+ Op = ConstantExpr::getCast(Op, IntPtrTy);
+ return EmitConstantValueOnly(Op);
+ }
+
+ // We know the dest type is not a pointer. Is the src value a pointer or
+ // integral?
+ if (isa<PointerType>(OpTy) || OpTy->isIntegral()) {
+ // 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->isIntegral() && TD->getTypeSize(Ty) >= TD->getTypeSize(OpTy))
+ return EmitConstantValueOnly(Op);
+ }
+
+ assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
EmitConstantValueOnly(Op);
break;
}
O << "\"";
}
+/// EmitString - Emit a zero-byte-terminated string constant.
+///
+void AsmPrinter::EmitString(const ConstantArray *CVA) const {
+ unsigned NumElts = CVA->getNumOperands();
+ if (AscizDirective && NumElts &&
+ cast<ConstantInt>(CVA->getOperand(NumElts-1))->getRawValue() == 0) {
+ O << AscizDirective;
+ printAsCString(O, CVA, NumElts-1);
+ } else {
+ O << AsciiDirective;
+ 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();
+ const TargetData *TD = TM.getTargetData();
if (CV->isNullValue() || isa<UndefValue>(CV)) {
- EmitZeros(TD.getTypeSize(CV->getType()));
+ EmitZeros(TD->getTypeSize(CV->getType()));
return;
} else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
if (CVA->isString()) {
- unsigned NumElts = CVA->getNumOperands();
- if (AscizDirective && NumElts &&
- cast<ConstantInt>(CVA->getOperand(NumElts-1))->getRawValue() == 0) {
- O << AscizDirective;
- printAsCString(O, CVA, NumElts-1);
- } else {
- O << AsciiDirective;
- printAsCString(O, CVA, NumElts);
- }
- O << "\n";
+ 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());
+ 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 fieldSize = TD->getTypeSize(field->getType());
uint64_t padSize = ((i == e-1? cvsLayout->StructSize
: cvsLayout->MemberOffsets[i+1])
- cvsLayout->MemberOffsets[i]) - fieldSize;
if (Data64bitsDirective)
O << Data64bitsDirective << DoubleToBits(Val) << "\t" << CommentString
<< " double value: " << Val << "\n";
- else if (TD.isBigEndian()) {
+ else if (TD->isBigEndian()) {
O << Data32bitsDirective << unsigned(DoubleToBits(Val) >> 32)
<< "\t" << CommentString << " double most significant word "
<< Val << "\n";
if (Data64bitsDirective)
O << Data64bitsDirective << Val << "\n";
- else if (TD.isBigEndian()) {
+ else if (TD->isBigEndian()) {
O << Data32bitsDirective << unsigned(Val >> 32)
<< "\t" << CommentString << " Double-word most significant word "
<< Val << "\n";
O << Data16bitsDirective;
break;
case Type::PointerTyID:
- if (TD.getPointerSize() == 8) {
+ if (TD->getPointerSize() == 8) {
+ assert(Data64bitsDirective &&
+ "Target cannot handle 64-bit pointer exprs!");
O << Data64bitsDirective;
break;
}
/// printInlineAsm - This method formats and prints the specified machine
/// instruction that is an inline asm.
void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
- O << InlineAsmStart;
unsigned NumOperands = MI->getNumOperands();
// Count the number of register definitions.
// 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 << InlineAsmStart << "\n\t";
+
// The variant of the current asmprinter: FIXME: change.
int AsmPrinterVariant = 0;
// Not a special case, emit the string section literally.
const char *LiteralEnd = LastEmitted+1;
while (*LiteralEnd && *LiteralEnd != '{' && *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.
if (*LastEmitted == '$') { // $$ -> $
// 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;
}
-
- unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
- ++OpNo; // Skip over the ID number.
-
- bool Error;
- AsmPrinter *AP = const_cast<AsmPrinter*>(this);
- if ((OpFlags & 7) == 4 /*ADDR MODE*/) {
- Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
- Modifier[0] ? Modifier : 0);
+
+ if (OpNo >= MI->getNumOperands()) {
+ Error = true;
} else {
- Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
- Modifier[0] ? Modifier : 0);
+ 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) {
std::cerr << "Invalid operand found in inline asm: '"
break;
}
}
- O << "\n" << InlineAsmEnd;
+ O << "\n\t" << InlineAsmEnd << "\n";
}
/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
// 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 << PrivateGlobalPrefix << "BB" << FunctionNumber << "_"
+ << MBB->getNumber();
+ if (printColon)
+ O << ':';
+ if (printComment)
+ O << '\t' << CommentString << MBB->getBasicBlock()->getName();
+}
+
+/// printSetLabel - This method prints a set label for the specified
+/// MachineBasicBlock
+void AsmPrinter::printSetLabel(unsigned uid,
+ const MachineBasicBlock *MBB) const {
+ if (!SetDirective)
+ return;
+
+ O << SetDirective << ' ' << PrivateGlobalPrefix << getFunctionNumber()
+ << '_' << uid << "_set_" << MBB->getNumber() << ',';
+ printBasicBlockLabel(MBB, false, false);
+ O << '-' << PrivateGlobalPrefix << "JTI" << getFunctionNumber()
+ << '_' << uid << '\n';
+}
projects / oota-llvm.git / blobdiff