mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-30 21:29:28 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135375 91177308-0d34-0410-b5e6-96231b3b80d8
606 lines
17 KiB
C++
606 lines
17 KiB
C++
//===-- PTXAsmPrinter.cpp - PTX LLVM assembly writer ----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a printer that converts from our internal representation
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// of machine-dependent LLVM code to PTX assembly language.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "ptx-asm-printer"
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#include "PTX.h"
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#include "PTXMachineFunctionInfo.h"
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#include "PTXTargetMachine.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Analysis/DebugInfo.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Target/Mangler.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetRegistry.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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namespace {
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class PTXAsmPrinter : public AsmPrinter {
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public:
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explicit PTXAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
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: AsmPrinter(TM, Streamer) {}
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const char *getPassName() const { return "PTX Assembly Printer"; }
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bool doFinalization(Module &M);
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virtual void EmitStartOfAsmFile(Module &M);
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virtual bool runOnMachineFunction(MachineFunction &MF);
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virtual void EmitFunctionBodyStart();
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virtual void EmitFunctionBodyEnd() { OutStreamer.EmitRawText(Twine("}")); }
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virtual void EmitInstruction(const MachineInstr *MI);
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void printOperand(const MachineInstr *MI, int opNum, raw_ostream &OS);
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void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &OS,
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const char *Modifier = 0);
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void printParamOperand(const MachineInstr *MI, int opNum, raw_ostream &OS,
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const char *Modifier = 0);
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void printReturnOperand(const MachineInstr *MI, int opNum, raw_ostream &OS,
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const char *Modifier = 0);
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void printPredicateOperand(const MachineInstr *MI, raw_ostream &O);
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unsigned GetOrCreateSourceID(StringRef FileName,
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StringRef DirName);
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// autogen'd.
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void printInstruction(const MachineInstr *MI, raw_ostream &OS);
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static const char *getRegisterName(unsigned RegNo);
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private:
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void EmitVariableDeclaration(const GlobalVariable *gv);
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void EmitFunctionDeclaration();
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StringMap<unsigned> SourceIdMap;
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}; // class PTXAsmPrinter
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} // namespace
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static const char PARAM_PREFIX[] = "__param_";
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static const char RETURN_PREFIX[] = "__ret_";
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static const char *getRegisterTypeName(unsigned RegNo) {
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#define TEST_REGCLS(cls, clsstr) \
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if (PTX::cls ## RegisterClass->contains(RegNo)) return # clsstr;
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TEST_REGCLS(RegPred, pred);
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TEST_REGCLS(RegI16, b16);
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TEST_REGCLS(RegI32, b32);
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TEST_REGCLS(RegI64, b64);
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TEST_REGCLS(RegF32, b32);
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TEST_REGCLS(RegF64, b64);
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#undef TEST_REGCLS
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llvm_unreachable("Not in any register class!");
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return NULL;
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}
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static const char *getStateSpaceName(unsigned addressSpace) {
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switch (addressSpace) {
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default: llvm_unreachable("Unknown state space");
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case PTX::GLOBAL: return "global";
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case PTX::CONSTANT: return "const";
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case PTX::LOCAL: return "local";
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case PTX::PARAMETER: return "param";
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case PTX::SHARED: return "shared";
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}
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return NULL;
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}
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static const char *getTypeName(Type* type) {
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while (true) {
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switch (type->getTypeID()) {
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default: llvm_unreachable("Unknown type");
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case Type::FloatTyID: return ".f32";
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case Type::DoubleTyID: return ".f64";
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case Type::IntegerTyID:
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switch (type->getPrimitiveSizeInBits()) {
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default: llvm_unreachable("Unknown integer bit-width");
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case 16: return ".u16";
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case 32: return ".u32";
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case 64: return ".u64";
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}
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case Type::ArrayTyID:
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case Type::PointerTyID:
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type = dyn_cast<SequentialType>(type)->getElementType();
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break;
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}
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}
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return NULL;
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}
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bool PTXAsmPrinter::doFinalization(Module &M) {
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// XXX Temproarily remove global variables so that doFinalization() will not
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// emit them again (global variables are emitted at beginning).
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Module::GlobalListType &global_list = M.getGlobalList();
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int i, n = global_list.size();
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GlobalVariable **gv_array = new GlobalVariable* [n];
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// first, back-up GlobalVariable in gv_array
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i = 0;
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for (Module::global_iterator I = global_list.begin(), E = global_list.end();
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I != E; ++I)
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gv_array[i++] = &*I;
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// second, empty global_list
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while (!global_list.empty())
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global_list.remove(global_list.begin());
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// call doFinalization
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bool ret = AsmPrinter::doFinalization(M);
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// now we restore global variables
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for (i = 0; i < n; i ++)
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global_list.insert(global_list.end(), gv_array[i]);
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delete[] gv_array;
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return ret;
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}
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void PTXAsmPrinter::EmitStartOfAsmFile(Module &M)
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{
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const PTXSubtarget& ST = TM.getSubtarget<PTXSubtarget>();
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OutStreamer.EmitRawText(Twine("\t.version " + ST.getPTXVersionString()));
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OutStreamer.EmitRawText(Twine("\t.target " + ST.getTargetString() +
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(ST.supportsDouble() ? ""
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: ", map_f64_to_f32")));
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// .address_size directive is optional, but it must immediately follow
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// the .target directive if present within a module
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if (ST.supportsPTX23()) {
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std::string addrSize = ST.is64Bit() ? "64" : "32";
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OutStreamer.EmitRawText(Twine("\t.address_size " + addrSize));
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}
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OutStreamer.AddBlankLine();
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// Define any .file directives
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DebugInfoFinder DbgFinder;
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DbgFinder.processModule(M);
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for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
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E = DbgFinder.compile_unit_end(); I != E; ++I) {
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DICompileUnit DIUnit(*I);
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StringRef FN = DIUnit.getFilename();
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StringRef Dir = DIUnit.getDirectory();
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GetOrCreateSourceID(FN, Dir);
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}
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OutStreamer.AddBlankLine();
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// declare global variables
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for (Module::const_global_iterator i = M.global_begin(), e = M.global_end();
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i != e; ++i)
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EmitVariableDeclaration(i);
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}
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bool PTXAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
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SetupMachineFunction(MF);
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EmitFunctionDeclaration();
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EmitFunctionBody();
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return false;
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}
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void PTXAsmPrinter::EmitFunctionBodyStart() {
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OutStreamer.EmitRawText(Twine("{"));
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const PTXMachineFunctionInfo *MFI = MF->getInfo<PTXMachineFunctionInfo>();
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// Print local variable definition
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for (PTXMachineFunctionInfo::reg_iterator
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i = MFI->localVarRegBegin(), e = MFI->localVarRegEnd(); i != e; ++ i) {
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unsigned reg = *i;
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std::string def = "\t.reg .";
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def += getRegisterTypeName(reg);
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def += ' ';
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def += getRegisterName(reg);
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def += ';';
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OutStreamer.EmitRawText(Twine(def));
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}
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const MachineFrameInfo* FrameInfo = MF->getFrameInfo();
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DEBUG(dbgs() << "Have " << FrameInfo->getNumObjects()
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<< " frame object(s)\n");
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for (unsigned i = 0, e = FrameInfo->getNumObjects(); i != e; ++i) {
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DEBUG(dbgs() << "Size of object: " << FrameInfo->getObjectSize(i) << "\n");
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if (FrameInfo->getObjectSize(i) > 0) {
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std::string def = "\t.reg .b";
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def += utostr(FrameInfo->getObjectSize(i)*8); // Convert to bits
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def += " s";
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def += utostr(i);
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def += ";";
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OutStreamer.EmitRawText(Twine(def));
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}
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}
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}
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void PTXAsmPrinter::EmitInstruction(const MachineInstr *MI) {
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std::string str;
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str.reserve(64);
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raw_string_ostream OS(str);
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DebugLoc DL = MI->getDebugLoc();
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if (!DL.isUnknown()) {
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const MDNode *S = DL.getScope(MF->getFunction()->getContext());
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// This is taken from DwarfDebug.cpp, which is conveniently not a public
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// LLVM class.
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StringRef Fn;
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StringRef Dir;
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unsigned Src = 1;
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if (S) {
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DIDescriptor Scope(S);
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if (Scope.isCompileUnit()) {
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DICompileUnit CU(S);
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Fn = CU.getFilename();
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Dir = CU.getDirectory();
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} else if (Scope.isFile()) {
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DIFile F(S);
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Fn = F.getFilename();
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Dir = F.getDirectory();
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} else if (Scope.isSubprogram()) {
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DISubprogram SP(S);
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Fn = SP.getFilename();
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Dir = SP.getDirectory();
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} else if (Scope.isLexicalBlock()) {
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DILexicalBlock DB(S);
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Fn = DB.getFilename();
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Dir = DB.getDirectory();
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} else
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assert(0 && "Unexpected scope info");
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Src = GetOrCreateSourceID(Fn, Dir);
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}
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OutStreamer.EmitDwarfLocDirective(Src, DL.getLine(), DL.getCol(),
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0, 0, 0, Fn);
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const MCDwarfLoc& MDL = OutContext.getCurrentDwarfLoc();
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OS << "\t.loc ";
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OS << utostr(MDL.getFileNum());
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OS << " ";
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OS << utostr(MDL.getLine());
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OS << " ";
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OS << utostr(MDL.getColumn());
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OS << "\n";
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}
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// Emit predicate
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printPredicateOperand(MI, OS);
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// Write instruction to str
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printInstruction(MI, OS);
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OS << ';';
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OS.flush();
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StringRef strref = StringRef(str);
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OutStreamer.EmitRawText(strref);
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}
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void PTXAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
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raw_ostream &OS) {
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const MachineOperand &MO = MI->getOperand(opNum);
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switch (MO.getType()) {
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default:
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llvm_unreachable("<unknown operand type>");
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break;
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case MachineOperand::MO_GlobalAddress:
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OS << *Mang->getSymbol(MO.getGlobal());
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break;
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case MachineOperand::MO_Immediate:
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OS << (long) MO.getImm();
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break;
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case MachineOperand::MO_MachineBasicBlock:
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OS << *MO.getMBB()->getSymbol();
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break;
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case MachineOperand::MO_Register:
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OS << getRegisterName(MO.getReg());
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break;
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case MachineOperand::MO_FPImmediate:
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APInt constFP = MO.getFPImm()->getValueAPF().bitcastToAPInt();
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bool isFloat = MO.getFPImm()->getType()->getTypeID() == Type::FloatTyID;
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// Emit 0F for 32-bit floats and 0D for 64-bit doubles.
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if (isFloat) {
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OS << "0F";
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}
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else {
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OS << "0D";
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}
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// Emit the encoded floating-point value.
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if (constFP.getZExtValue() > 0) {
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OS << constFP.toString(16, false);
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}
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else {
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OS << "00000000";
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// If We have a double-precision zero, pad to 8-bytes.
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if (!isFloat) {
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OS << "00000000";
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}
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}
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break;
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}
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}
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void PTXAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
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raw_ostream &OS, const char *Modifier) {
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printOperand(MI, opNum, OS);
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if (MI->getOperand(opNum+1).isImm() && MI->getOperand(opNum+1).getImm() == 0)
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return; // don't print "+0"
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OS << "+";
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printOperand(MI, opNum+1, OS);
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}
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void PTXAsmPrinter::printParamOperand(const MachineInstr *MI, int opNum,
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raw_ostream &OS, const char *Modifier) {
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OS << PARAM_PREFIX << (int) MI->getOperand(opNum).getImm() + 1;
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}
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void PTXAsmPrinter::printReturnOperand(const MachineInstr *MI, int opNum,
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raw_ostream &OS, const char *Modifier) {
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OS << RETURN_PREFIX << (int) MI->getOperand(opNum).getImm() + 1;
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}
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void PTXAsmPrinter::EmitVariableDeclaration(const GlobalVariable *gv) {
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// Check to see if this is a special global used by LLVM, if so, emit it.
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if (EmitSpecialLLVMGlobal(gv))
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return;
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MCSymbol *gvsym = Mang->getSymbol(gv);
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assert(gvsym->isUndefined() && "Cannot define a symbol twice!");
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std::string decl;
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// check if it is defined in some other translation unit
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if (gv->isDeclaration())
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decl += ".extern ";
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// state space: e.g., .global
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decl += ".";
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decl += getStateSpaceName(gv->getType()->getAddressSpace());
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decl += " ";
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// alignment (optional)
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unsigned alignment = gv->getAlignment();
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if (alignment != 0) {
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decl += ".align ";
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decl += utostr(Log2_32(gv->getAlignment()));
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decl += " ";
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}
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if (PointerType::classof(gv->getType())) {
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PointerType* pointerTy = dyn_cast<PointerType>(gv->getType());
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Type* elementTy = pointerTy->getElementType();
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decl += ".b8 ";
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decl += gvsym->getName();
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decl += "[";
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if (elementTy->isArrayTy())
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{
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assert(elementTy->isArrayTy() && "Only pointers to arrays are supported");
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ArrayType* arrayTy = dyn_cast<ArrayType>(elementTy);
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elementTy = arrayTy->getElementType();
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unsigned numElements = arrayTy->getNumElements();
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while (elementTy->isArrayTy()) {
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arrayTy = dyn_cast<ArrayType>(elementTy);
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elementTy = arrayTy->getElementType();
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numElements *= arrayTy->getNumElements();
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}
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// FIXME: isPrimitiveType() == false for i16?
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assert(elementTy->isSingleValueType() &&
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"Non-primitive types are not handled");
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// Compute the size of the array, in bytes.
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uint64_t arraySize = (elementTy->getPrimitiveSizeInBits() >> 3)
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* numElements;
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decl += utostr(arraySize);
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}
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decl += "]";
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// handle string constants (assume ConstantArray means string)
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if (gv->hasInitializer())
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{
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const Constant *C = gv->getInitializer();
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if (const ConstantArray *CA = dyn_cast<ConstantArray>(C))
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{
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decl += " = {";
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for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
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{
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if (i > 0) decl += ",";
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decl += "0x" +
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utohexstr(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
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}
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decl += "}";
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}
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}
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}
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else {
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// Note: this is currently the fall-through case and most likely generates
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// incorrect code.
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decl += getTypeName(gv->getType());
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decl += " ";
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decl += gvsym->getName();
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if (ArrayType::classof(gv->getType()) ||
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PointerType::classof(gv->getType()))
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decl += "[]";
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}
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decl += ";";
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OutStreamer.EmitRawText(Twine(decl));
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OutStreamer.AddBlankLine();
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}
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void PTXAsmPrinter::EmitFunctionDeclaration() {
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// The function label could have already been emitted if two symbols end up
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// conflicting due to asm renaming. Detect this and emit an error.
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if (!CurrentFnSym->isUndefined()) {
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report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
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"' label emitted multiple times to assembly file");
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return;
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}
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const PTXMachineFunctionInfo *MFI = MF->getInfo<PTXMachineFunctionInfo>();
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const bool isKernel = MFI->isKernel();
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const PTXSubtarget& ST = TM.getSubtarget<PTXSubtarget>();
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std::string decl = isKernel ? ".entry" : ".func";
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unsigned cnt = 0;
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if (!isKernel) {
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decl += " (";
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for (PTXMachineFunctionInfo::ret_iterator
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i = MFI->retRegBegin(), e = MFI->retRegEnd(), b = i;
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i != e; ++i) {
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if (i != b) {
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decl += ", ";
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}
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decl += ".reg .";
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decl += getRegisterTypeName(*i);
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decl += " ";
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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);
|
|
}
|