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llvm-project/llvm/lib/Target/PTX/PTXAsmPrinter.cpp

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//===-- PTXAsmPrinter.cpp - PTX LLVM assembly writer ----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a printer that converts from our internal representation
// of machine-dependent LLVM code to PTX assembly language.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "ptx-asm-printer"
#include "PTX.h"
#include "PTXMachineFunctionInfo.h"
#include "PTXTargetMachine.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Analysis/DebugInfo.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Target/Mangler.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
class PTXAsmPrinter : public AsmPrinter {
public:
explicit PTXAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
: AsmPrinter(TM, Streamer) {}
const char *getPassName() const { return "PTX Assembly Printer"; }
bool doFinalization(Module &M);
virtual void EmitStartOfAsmFile(Module &M);
virtual bool runOnMachineFunction(MachineFunction &MF);
virtual void EmitFunctionBodyStart();
virtual void EmitFunctionBodyEnd() { OutStreamer.EmitRawText(Twine("}")); }
virtual void EmitInstruction(const MachineInstr *MI);
void printOperand(const MachineInstr *MI, int opNum, raw_ostream &OS);
void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &OS,
const char *Modifier = 0);
void printParamOperand(const MachineInstr *MI, int opNum, raw_ostream &OS,
const char *Modifier = 0);
void printReturnOperand(const MachineInstr *MI, int opNum, raw_ostream &OS,
const char *Modifier = 0);
void printPredicateOperand(const MachineInstr *MI, raw_ostream &O);
unsigned GetOrCreateSourceID(StringRef FileName,
StringRef DirName);
// autogen'd.
void printInstruction(const MachineInstr *MI, raw_ostream &OS);
static const char *getRegisterName(unsigned RegNo);
private:
void EmitVariableDeclaration(const GlobalVariable *gv);
void EmitFunctionDeclaration();
StringMap<unsigned> SourceIdMap;
}; // class PTXAsmPrinter
} // namespace
static const char PARAM_PREFIX[] = "__param_";
static const char RETURN_PREFIX[] = "__ret_";
static const char *getRegisterTypeName(unsigned RegNo) {
#define TEST_REGCLS(cls, clsstr) \
if (PTX::cls ## RegisterClass->contains(RegNo)) return # clsstr;
TEST_REGCLS(RegPred, pred);
TEST_REGCLS(RegI16, b16);
TEST_REGCLS(RegI32, b32);
TEST_REGCLS(RegI64, b64);
TEST_REGCLS(RegF32, b32);
TEST_REGCLS(RegF64, b64);
#undef TEST_REGCLS
llvm_unreachable("Not in any register class!");
return NULL;
}
static const char *getStateSpaceName(unsigned addressSpace) {
switch (addressSpace) {
default: llvm_unreachable("Unknown state space");
case PTX::GLOBAL: return "global";
case PTX::CONSTANT: return "const";
case PTX::LOCAL: return "local";
case PTX::PARAMETER: return "param";
case PTX::SHARED: return "shared";
}
return NULL;
}
static const char *getTypeName(const Type* type) {
while (true) {
switch (type->getTypeID()) {
default: llvm_unreachable("Unknown type");
case Type::FloatTyID: return ".f32";
case Type::DoubleTyID: return ".f64";
case Type::IntegerTyID:
switch (type->getPrimitiveSizeInBits()) {
default: llvm_unreachable("Unknown integer bit-width");
case 16: return ".u16";
case 32: return ".u32";
case 64: return ".u64";
}
case Type::ArrayTyID:
case Type::PointerTyID:
type = dyn_cast<const SequentialType>(type)->getElementType();
break;
}
}
return NULL;
}
bool PTXAsmPrinter::doFinalization(Module &M) {
// XXX Temproarily remove global variables so that doFinalization() will not
// emit them again (global variables are emitted at beginning).
Module::GlobalListType &global_list = M.getGlobalList();
int i, n = global_list.size();
GlobalVariable **gv_array = new GlobalVariable* [n];
// first, back-up GlobalVariable in gv_array
i = 0;
for (Module::global_iterator I = global_list.begin(), E = global_list.end();
I != E; ++I)
gv_array[i++] = &*I;
// second, empty global_list
while (!global_list.empty())
global_list.remove(global_list.begin());
// call doFinalization
bool ret = AsmPrinter::doFinalization(M);
// now we restore global variables
for (i = 0; i < n; i ++)
global_list.insert(global_list.end(), gv_array[i]);
delete[] gv_array;
return ret;
}
void PTXAsmPrinter::EmitStartOfAsmFile(Module &M)
{
const PTXSubtarget& ST = TM.getSubtarget<PTXSubtarget>();
OutStreamer.EmitRawText(Twine("\t.version " + ST.getPTXVersionString()));
OutStreamer.EmitRawText(Twine("\t.target " + ST.getTargetString() +
(ST.supportsDouble() ? ""
: ", map_f64_to_f32")));
// .address_size directive is optional, but it must immediately follow
// the .target directive if present within a module
if (ST.supportsPTX23()) {
std::string addrSize = ST.is64Bit() ? "64" : "32";
OutStreamer.EmitRawText(Twine("\t.address_size " + addrSize));
}
OutStreamer.AddBlankLine();
// Define any .file directives
DebugInfoFinder DbgFinder;
DbgFinder.processModule(M);
for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
E = DbgFinder.compile_unit_end(); I != E; ++I) {
DICompileUnit DIUnit(*I);
StringRef FN = DIUnit.getFilename();
StringRef Dir = DIUnit.getDirectory();
GetOrCreateSourceID(FN, Dir);
}
OutStreamer.AddBlankLine();
// declare global variables
for (Module::const_global_iterator i = M.global_begin(), e = M.global_end();
i != e; ++i)
EmitVariableDeclaration(i);
}
bool PTXAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
SetupMachineFunction(MF);
EmitFunctionDeclaration();
EmitFunctionBody();
return false;
}
void PTXAsmPrinter::EmitFunctionBodyStart() {
OutStreamer.EmitRawText(Twine("{"));
const PTXMachineFunctionInfo *MFI = MF->getInfo<PTXMachineFunctionInfo>();
// Print local variable definition
for (PTXMachineFunctionInfo::reg_iterator
i = MFI->localVarRegBegin(), e = MFI->localVarRegEnd(); i != e; ++ i) {
unsigned reg = *i;
std::string def = "\t.reg .";
def += getRegisterTypeName(reg);
def += ' ';
def += getRegisterName(reg);
def += ';';
OutStreamer.EmitRawText(Twine(def));
}
const MachineFrameInfo* FrameInfo = MF->getFrameInfo();
DEBUG(dbgs() << "Have " << FrameInfo->getNumObjects()
<< " frame object(s)\n");
for (unsigned i = 0, e = FrameInfo->getNumObjects(); i != e; ++i) {
DEBUG(dbgs() << "Size of object: " << FrameInfo->getObjectSize(i) << "\n");
if (FrameInfo->getObjectSize(i) > 0) {
std::string def = "\t.reg .b";
def += utostr(FrameInfo->getObjectSize(i)*8); // Convert to bits
def += " s";
def += utostr(i);
def += ";";
OutStreamer.EmitRawText(Twine(def));
}
}
}
void PTXAsmPrinter::EmitInstruction(const MachineInstr *MI) {
std::string str;
str.reserve(64);
raw_string_ostream OS(str);
DebugLoc DL = MI->getDebugLoc();
if (!DL.isUnknown()) {
const MDNode *S = DL.getScope(MF->getFunction()->getContext());
// This is taken from DwarfDebug.cpp, which is conveniently not a public
// LLVM class.
StringRef Fn;
StringRef Dir;
unsigned Src = 1;
if (S) {
DIDescriptor Scope(S);
if (Scope.isCompileUnit()) {
DICompileUnit CU(S);
Fn = CU.getFilename();
Dir = CU.getDirectory();
} else if (Scope.isFile()) {
DIFile F(S);
Fn = F.getFilename();
Dir = F.getDirectory();
} else if (Scope.isSubprogram()) {
DISubprogram SP(S);
Fn = SP.getFilename();
Dir = SP.getDirectory();
} else if (Scope.isLexicalBlock()) {
DILexicalBlock DB(S);
Fn = DB.getFilename();
Dir = DB.getDirectory();
} else
assert(0 && "Unexpected scope info");
Src = GetOrCreateSourceID(Fn, Dir);
}
OutStreamer.EmitDwarfLocDirective(Src, DL.getLine(), DL.getCol(),
0, 0, 0, Fn);
const MCDwarfLoc& MDL = OutContext.getCurrentDwarfLoc();
OS << "\t.loc ";
OS << utostr(MDL.getFileNum());
OS << " ";
OS << utostr(MDL.getLine());
OS << " ";
OS << utostr(MDL.getColumn());
OS << "\n";
}
// Emit predicate
printPredicateOperand(MI, OS);
// Write instruction to str
printInstruction(MI, OS);
OS << ';';
OS.flush();
StringRef strref = StringRef(str);
OutStreamer.EmitRawText(strref);
}
void PTXAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
raw_ostream &OS) {
const MachineOperand &MO = MI->getOperand(opNum);
switch (MO.getType()) {
default:
llvm_unreachable("<unknown operand type>");
break;
case MachineOperand::MO_GlobalAddress:
OS << *Mang->getSymbol(MO.getGlobal());
break;
case MachineOperand::MO_Immediate:
OS << (long) MO.getImm();
break;
case MachineOperand::MO_MachineBasicBlock:
OS << *MO.getMBB()->getSymbol();
break;
case MachineOperand::MO_Register:
OS << getRegisterName(MO.getReg());
break;
case MachineOperand::MO_FPImmediate:
APInt constFP = MO.getFPImm()->getValueAPF().bitcastToAPInt();
bool isFloat = MO.getFPImm()->getType()->getTypeID() == Type::FloatTyID;
// Emit 0F for 32-bit floats and 0D for 64-bit doubles.
if (isFloat) {
OS << "0F";
}
else {
OS << "0D";
}
// Emit the encoded floating-point value.
if (constFP.getZExtValue() > 0) {
OS << constFP.toString(16, false);
}
else {
OS << "00000000";
// If We have a double-precision zero, pad to 8-bytes.
if (!isFloat) {
OS << "00000000";
}
}
break;
}
}
void PTXAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
raw_ostream &OS, const char *Modifier) {
printOperand(MI, opNum, OS);
if (MI->getOperand(opNum+1).isImm() && MI->getOperand(opNum+1).getImm() == 0)
return; // don't print "+0"
OS << "+";
printOperand(MI, opNum+1, OS);
}
void PTXAsmPrinter::printParamOperand(const MachineInstr *MI, int opNum,
raw_ostream &OS, const char *Modifier) {
OS << PARAM_PREFIX << (int) MI->getOperand(opNum).getImm() + 1;
}
void PTXAsmPrinter::printReturnOperand(const MachineInstr *MI, int opNum,
raw_ostream &OS, const char *Modifier) {
OS << RETURN_PREFIX << (int) MI->getOperand(opNum).getImm() + 1;
}
void PTXAsmPrinter::EmitVariableDeclaration(const GlobalVariable *gv) {
// Check to see if this is a special global used by LLVM, if so, emit it.
if (EmitSpecialLLVMGlobal(gv))
return;
MCSymbol *gvsym = Mang->getSymbol(gv);
assert(gvsym->isUndefined() && "Cannot define a symbol twice!");
std::string decl;
// check if it is defined in some other translation unit
if (gv->isDeclaration())
decl += ".extern ";
// state space: e.g., .global
decl += ".";
decl += getStateSpaceName(gv->getType()->getAddressSpace());
decl += " ";
// alignment (optional)
unsigned alignment = gv->getAlignment();
if (alignment != 0) {
decl += ".align ";
decl += utostr(Log2_32(gv->getAlignment()));
decl += " ";
}
if (PointerType::classof(gv->getType())) {
const PointerType* pointerTy = dyn_cast<const PointerType>(gv->getType());
const Type* elementTy = pointerTy->getElementType();
decl += ".b8 ";
decl += gvsym->getName();
decl += "[";
if (elementTy->isArrayTy())
{
assert(elementTy->isArrayTy() && "Only pointers to arrays are supported");
const ArrayType* arrayTy = dyn_cast<const ArrayType>(elementTy);
elementTy = arrayTy->getElementType();
unsigned numElements = arrayTy->getNumElements();
while (elementTy->isArrayTy()) {
arrayTy = dyn_cast<const ArrayType>(elementTy);
elementTy = arrayTy->getElementType();
numElements *= arrayTy->getNumElements();
}
// FIXME: isPrimitiveType() == false for i16?
assert(elementTy->isSingleValueType() &&
"Non-primitive types are not handled");
// Compute the size of the array, in bytes.
uint64_t arraySize = (elementTy->getPrimitiveSizeInBits() >> 3)
* numElements;
decl += utostr(arraySize);
}
decl += "]";
// handle string constants (assume ConstantArray means string)
if (gv->hasInitializer())
{
const Constant *C = gv->getInitializer();
if (const ConstantArray *CA = dyn_cast<ConstantArray>(C))
{
decl += " = {";
for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
{
if (i > 0) decl += ",";
decl += "0x" +
utohexstr(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
}
decl += "}";
}
}
}
else {
// Note: this is currently the fall-through case and most likely generates
// incorrect code.
decl += getTypeName(gv->getType());
decl += " ";
decl += gvsym->getName();
if (ArrayType::classof(gv->getType()) ||
PointerType::classof(gv->getType()))
decl += "[]";
}
decl += ";";
OutStreamer.EmitRawText(Twine(decl));
OutStreamer.AddBlankLine();
}
void PTXAsmPrinter::EmitFunctionDeclaration() {
// The function label could have already been emitted if two symbols end up
// conflicting due to asm renaming. Detect this and emit an error.
if (!CurrentFnSym->isUndefined()) {
report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
"' label emitted multiple times to assembly file");
return;
}
const PTXMachineFunctionInfo *MFI = MF->getInfo<PTXMachineFunctionInfo>();
const bool isKernel = MFI->isKernel();
const PTXSubtarget& ST = TM.getSubtarget<PTXSubtarget>();
std::string decl = isKernel ? ".entry" : ".func";
unsigned cnt = 0;
if (!isKernel) {
decl += " (";
for (PTXMachineFunctionInfo::ret_iterator
i = MFI->retRegBegin(), e = MFI->retRegEnd(), b = i;
i != e; ++i) {
if (i != b) {
decl += ", ";
}
decl += ".reg .";
decl += getRegisterTypeName(*i);
decl += " ";
decl += getRegisterName(*i);
}
decl += ")";
}
// Print function name
decl += " ";
decl += CurrentFnSym->getName().str();
decl += " (";
cnt = 0;
// Print parameters
for (PTXMachineFunctionInfo::reg_iterator
i = MFI->argRegBegin(), e = MFI->argRegEnd(), b = i;
i != e; ++i) {
if (i != b) {
decl += ", ";
}
if (isKernel || ST.useParamSpaceForDeviceArgs()) {
decl += ".param .b";
decl += utostr(*i);
decl += " ";
decl += PARAM_PREFIX;
decl += utostr(++cnt);
} else {
decl += ".reg .";
decl += getRegisterTypeName(*i);
decl += " ";
decl += getRegisterName(*i);
}
}
decl += ")";
OutStreamer.EmitRawText(Twine(decl));
}
void PTXAsmPrinter::
printPredicateOperand(const MachineInstr *MI, raw_ostream &O) {
int i = MI->findFirstPredOperandIdx();
if (i == -1)
llvm_unreachable("missing predicate operand");
unsigned reg = MI->getOperand(i).getReg();
int predOp = MI->getOperand(i+1).getImm();
DEBUG(dbgs() << "predicate: (" << reg << ", " << predOp << ")\n");
if (reg != PTX::NoRegister) {
O << '@';
if (predOp == PTX::PRED_NEGATE)
O << '!';
O << getRegisterName(reg);
}
}
unsigned PTXAsmPrinter::GetOrCreateSourceID(StringRef FileName,
StringRef DirName) {
// If FE did not provide a file name, then assume stdin.
if (FileName.empty())
return GetOrCreateSourceID("<stdin>", StringRef());
// MCStream expects full path name as filename.
if (!DirName.empty() && !sys::path::is_absolute(FileName)) {
SmallString<128> FullPathName = DirName;
sys::path::append(FullPathName, FileName);
// Here FullPathName will be copied into StringMap by GetOrCreateSourceID.
return GetOrCreateSourceID(StringRef(FullPathName), StringRef());
}
StringMapEntry<unsigned> &Entry = SourceIdMap.GetOrCreateValue(FileName);
if (Entry.getValue())
return Entry.getValue();
unsigned SrcId = SourceIdMap.size();
Entry.setValue(SrcId);
// Print out a .file directive to specify files for .loc directives.
OutStreamer.EmitDwarfFileDirective(SrcId, Entry.getKey());
return SrcId;
}
#include "PTXGenAsmWriter.inc"
// Force static initialization.
extern "C" void LLVMInitializePTXAsmPrinter() {
RegisterAsmPrinter<PTXAsmPrinter> X(ThePTX32Target);
RegisterAsmPrinter<PTXAsmPrinter> Y(ThePTX64Target);
}
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