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      1 //===- NVPTXUtilities.cpp - Utility Functions -----------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This file contains miscellaneous utility functions
     11 //===----------------------------------------------------------------------===//
     12 
     13 #include "NVPTXUtilities.h"
     14 #include "NVPTX.h"
     15 #include "llvm/IR/Constants.h"
     16 #include "llvm/IR/Function.h"
     17 #include "llvm/IR/GlobalVariable.h"
     18 #include "llvm/IR/InstIterator.h"
     19 #include "llvm/IR/Module.h"
     20 #include "llvm/IR/Operator.h"
     21 #include "llvm/Support/ManagedStatic.h"
     22 #include "llvm/Support/MutexGuard.h"
     23 #include <algorithm>
     24 #include <cstring>
     25 #include <map>
     26 #include <string>
     27 #include <vector>
     28 
     29 using namespace llvm;
     30 
     31 typedef std::map<std::string, std::vector<unsigned> > key_val_pair_t;
     32 typedef std::map<const GlobalValue *, key_val_pair_t> global_val_annot_t;
     33 typedef std::map<const Module *, global_val_annot_t> per_module_annot_t;
     34 
     35 ManagedStatic<per_module_annot_t> annotationCache;
     36 static sys::Mutex Lock;
     37 
     38 void llvm::clearAnnotationCache(const llvm::Module *Mod) {
     39   MutexGuard Guard(Lock);
     40   annotationCache->erase(Mod);
     41 }
     42 
     43 static void cacheAnnotationFromMD(const MDNode *md, key_val_pair_t &retval) {
     44   MutexGuard Guard(Lock);
     45   assert(md && "Invalid mdnode for annotation");
     46   assert((md->getNumOperands() % 2) == 1 && "Invalid number of operands");
     47   // start index = 1, to skip the global variable key
     48   // increment = 2, to skip the value for each property-value pairs
     49   for (unsigned i = 1, e = md->getNumOperands(); i != e; i += 2) {
     50     // property
     51     const MDString *prop = dyn_cast<MDString>(md->getOperand(i));
     52     assert(prop && "Annotation property not a string");
     53 
     54     // value
     55     ConstantInt *Val = mdconst::dyn_extract<ConstantInt>(md->getOperand(i + 1));
     56     assert(Val && "Value operand not a constant int");
     57 
     58     std::string keyname = prop->getString().str();
     59     if (retval.find(keyname) != retval.end())
     60       retval[keyname].push_back(Val->getZExtValue());
     61     else {
     62       std::vector<unsigned> tmp;
     63       tmp.push_back(Val->getZExtValue());
     64       retval[keyname] = tmp;
     65     }
     66   }
     67 }
     68 
     69 static void cacheAnnotationFromMD(const Module *m, const GlobalValue *gv) {
     70   MutexGuard Guard(Lock);
     71   NamedMDNode *NMD = m->getNamedMetadata(llvm::NamedMDForAnnotations);
     72   if (!NMD)
     73     return;
     74   key_val_pair_t tmp;
     75   for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
     76     const MDNode *elem = NMD->getOperand(i);
     77 
     78     GlobalValue *entity =
     79         mdconst::dyn_extract_or_null<GlobalValue>(elem->getOperand(0));
     80     // entity may be null due to DCE
     81     if (!entity)
     82       continue;
     83     if (entity != gv)
     84       continue;
     85 
     86     // accumulate annotations for entity in tmp
     87     cacheAnnotationFromMD(elem, tmp);
     88   }
     89 
     90   if (tmp.empty()) // no annotations for this gv
     91     return;
     92 
     93   if ((*annotationCache).find(m) != (*annotationCache).end())
     94     (*annotationCache)[m][gv] = std::move(tmp);
     95   else {
     96     global_val_annot_t tmp1;
     97     tmp1[gv] = std::move(tmp);
     98     (*annotationCache)[m] = std::move(tmp1);
     99   }
    100 }
    101 
    102 bool llvm::findOneNVVMAnnotation(const GlobalValue *gv, const std::string &prop,
    103                                  unsigned &retval) {
    104   MutexGuard Guard(Lock);
    105   const Module *m = gv->getParent();
    106   if ((*annotationCache).find(m) == (*annotationCache).end())
    107     cacheAnnotationFromMD(m, gv);
    108   else if ((*annotationCache)[m].find(gv) == (*annotationCache)[m].end())
    109     cacheAnnotationFromMD(m, gv);
    110   if ((*annotationCache)[m][gv].find(prop) == (*annotationCache)[m][gv].end())
    111     return false;
    112   retval = (*annotationCache)[m][gv][prop][0];
    113   return true;
    114 }
    115 
    116 bool llvm::findAllNVVMAnnotation(const GlobalValue *gv, const std::string &prop,
    117                                  std::vector<unsigned> &retval) {
    118   MutexGuard Guard(Lock);
    119   const Module *m = gv->getParent();
    120   if ((*annotationCache).find(m) == (*annotationCache).end())
    121     cacheAnnotationFromMD(m, gv);
    122   else if ((*annotationCache)[m].find(gv) == (*annotationCache)[m].end())
    123     cacheAnnotationFromMD(m, gv);
    124   if ((*annotationCache)[m][gv].find(prop) == (*annotationCache)[m][gv].end())
    125     return false;
    126   retval = (*annotationCache)[m][gv][prop];
    127   return true;
    128 }
    129 
    130 bool llvm::isTexture(const llvm::Value &val) {
    131   if (const GlobalValue *gv = dyn_cast<GlobalValue>(&val)) {
    132     unsigned annot;
    133     if (llvm::findOneNVVMAnnotation(
    134             gv, llvm::PropertyAnnotationNames[llvm::PROPERTY_ISTEXTURE],
    135             annot)) {
    136       assert((annot == 1) && "Unexpected annotation on a texture symbol");
    137       return true;
    138     }
    139   }
    140   return false;
    141 }
    142 
    143 bool llvm::isSurface(const llvm::Value &val) {
    144   if (const GlobalValue *gv = dyn_cast<GlobalValue>(&val)) {
    145     unsigned annot;
    146     if (llvm::findOneNVVMAnnotation(
    147             gv, llvm::PropertyAnnotationNames[llvm::PROPERTY_ISSURFACE],
    148             annot)) {
    149       assert((annot == 1) && "Unexpected annotation on a surface symbol");
    150       return true;
    151     }
    152   }
    153   return false;
    154 }
    155 
    156 bool llvm::isSampler(const llvm::Value &val) {
    157   if (const GlobalValue *gv = dyn_cast<GlobalValue>(&val)) {
    158     unsigned annot;
    159     if (llvm::findOneNVVMAnnotation(
    160             gv, llvm::PropertyAnnotationNames[llvm::PROPERTY_ISSAMPLER],
    161             annot)) {
    162       assert((annot == 1) && "Unexpected annotation on a sampler symbol");
    163       return true;
    164     }
    165   }
    166   if (const Argument *arg = dyn_cast<Argument>(&val)) {
    167     const Function *func = arg->getParent();
    168     std::vector<unsigned> annot;
    169     if (llvm::findAllNVVMAnnotation(
    170             func, llvm::PropertyAnnotationNames[llvm::PROPERTY_ISSAMPLER],
    171             annot)) {
    172       if (std::find(annot.begin(), annot.end(), arg->getArgNo()) != annot.end())
    173         return true;
    174     }
    175   }
    176   return false;
    177 }
    178 
    179 bool llvm::isImageReadOnly(const llvm::Value &val) {
    180   if (const Argument *arg = dyn_cast<Argument>(&val)) {
    181     const Function *func = arg->getParent();
    182     std::vector<unsigned> annot;
    183     if (llvm::findAllNVVMAnnotation(func,
    184                                     llvm::PropertyAnnotationNames[
    185                                         llvm::PROPERTY_ISREADONLY_IMAGE_PARAM],
    186                                     annot)) {
    187       if (std::find(annot.begin(), annot.end(), arg->getArgNo()) != annot.end())
    188         return true;
    189     }
    190   }
    191   return false;
    192 }
    193 
    194 bool llvm::isImageWriteOnly(const llvm::Value &val) {
    195   if (const Argument *arg = dyn_cast<Argument>(&val)) {
    196     const Function *func = arg->getParent();
    197     std::vector<unsigned> annot;
    198     if (llvm::findAllNVVMAnnotation(func,
    199                                     llvm::PropertyAnnotationNames[
    200                                         llvm::PROPERTY_ISWRITEONLY_IMAGE_PARAM],
    201                                     annot)) {
    202       if (std::find(annot.begin(), annot.end(), arg->getArgNo()) != annot.end())
    203         return true;
    204     }
    205   }
    206   return false;
    207 }
    208 
    209 bool llvm::isImageReadWrite(const llvm::Value &val) {
    210   if (const Argument *arg = dyn_cast<Argument>(&val)) {
    211     const Function *func = arg->getParent();
    212     std::vector<unsigned> annot;
    213     if (llvm::findAllNVVMAnnotation(func,
    214                                     llvm::PropertyAnnotationNames[
    215                                         llvm::PROPERTY_ISREADWRITE_IMAGE_PARAM],
    216                                     annot)) {
    217       if (std::find(annot.begin(), annot.end(), arg->getArgNo()) != annot.end())
    218         return true;
    219     }
    220   }
    221   return false;
    222 }
    223 
    224 bool llvm::isImage(const llvm::Value &val) {
    225   return llvm::isImageReadOnly(val) || llvm::isImageWriteOnly(val) ||
    226          llvm::isImageReadWrite(val);
    227 }
    228 
    229 bool llvm::isManaged(const llvm::Value &val) {
    230   if(const GlobalValue *gv = dyn_cast<GlobalValue>(&val)) {
    231     unsigned annot;
    232     if(llvm::findOneNVVMAnnotation(gv,
    233                           llvm::PropertyAnnotationNames[llvm::PROPERTY_MANAGED],
    234                                    annot)) {
    235       assert((annot == 1) && "Unexpected annotation on a managed symbol");
    236       return true;
    237     }
    238   }
    239   return false;
    240 }
    241 
    242 std::string llvm::getTextureName(const llvm::Value &val) {
    243   assert(val.hasName() && "Found texture variable with no name");
    244   return val.getName();
    245 }
    246 
    247 std::string llvm::getSurfaceName(const llvm::Value &val) {
    248   assert(val.hasName() && "Found surface variable with no name");
    249   return val.getName();
    250 }
    251 
    252 std::string llvm::getSamplerName(const llvm::Value &val) {
    253   assert(val.hasName() && "Found sampler variable with no name");
    254   return val.getName();
    255 }
    256 
    257 bool llvm::getMaxNTIDx(const Function &F, unsigned &x) {
    258   return (llvm::findOneNVVMAnnotation(
    259       &F, llvm::PropertyAnnotationNames[llvm::PROPERTY_MAXNTID_X], x));
    260 }
    261 
    262 bool llvm::getMaxNTIDy(const Function &F, unsigned &y) {
    263   return (llvm::findOneNVVMAnnotation(
    264       &F, llvm::PropertyAnnotationNames[llvm::PROPERTY_MAXNTID_Y], y));
    265 }
    266 
    267 bool llvm::getMaxNTIDz(const Function &F, unsigned &z) {
    268   return (llvm::findOneNVVMAnnotation(
    269       &F, llvm::PropertyAnnotationNames[llvm::PROPERTY_MAXNTID_Z], z));
    270 }
    271 
    272 bool llvm::getReqNTIDx(const Function &F, unsigned &x) {
    273   return (llvm::findOneNVVMAnnotation(
    274       &F, llvm::PropertyAnnotationNames[llvm::PROPERTY_REQNTID_X], x));
    275 }
    276 
    277 bool llvm::getReqNTIDy(const Function &F, unsigned &y) {
    278   return (llvm::findOneNVVMAnnotation(
    279       &F, llvm::PropertyAnnotationNames[llvm::PROPERTY_REQNTID_Y], y));
    280 }
    281 
    282 bool llvm::getReqNTIDz(const Function &F, unsigned &z) {
    283   return (llvm::findOneNVVMAnnotation(
    284       &F, llvm::PropertyAnnotationNames[llvm::PROPERTY_REQNTID_Z], z));
    285 }
    286 
    287 bool llvm::getMinCTASm(const Function &F, unsigned &x) {
    288   return (llvm::findOneNVVMAnnotation(
    289       &F, llvm::PropertyAnnotationNames[llvm::PROPERTY_MINNCTAPERSM], x));
    290 }
    291 
    292 bool llvm::isKernelFunction(const Function &F) {
    293   unsigned x = 0;
    294   bool retval = llvm::findOneNVVMAnnotation(
    295       &F, llvm::PropertyAnnotationNames[llvm::PROPERTY_ISKERNEL_FUNCTION], x);
    296   if (!retval) {
    297     // There is no NVVM metadata, check the calling convention
    298     return F.getCallingConv() == llvm::CallingConv::PTX_Kernel;
    299   }
    300   return (x == 1);
    301 }
    302 
    303 bool llvm::getAlign(const Function &F, unsigned index, unsigned &align) {
    304   std::vector<unsigned> Vs;
    305   bool retval = llvm::findAllNVVMAnnotation(
    306       &F, llvm::PropertyAnnotationNames[llvm::PROPERTY_ALIGN], Vs);
    307   if (!retval)
    308     return false;
    309   for (int i = 0, e = Vs.size(); i < e; i++) {
    310     unsigned v = Vs[i];
    311     if ((v >> 16) == index) {
    312       align = v & 0xFFFF;
    313       return true;
    314     }
    315   }
    316   return false;
    317 }
    318 
    319 bool llvm::getAlign(const CallInst &I, unsigned index, unsigned &align) {
    320   if (MDNode *alignNode = I.getMetadata("callalign")) {
    321     for (int i = 0, n = alignNode->getNumOperands(); i < n; i++) {
    322       if (const ConstantInt *CI =
    323               mdconst::dyn_extract<ConstantInt>(alignNode->getOperand(i))) {
    324         unsigned v = CI->getZExtValue();
    325         if ((v >> 16) == index) {
    326           align = v & 0xFFFF;
    327           return true;
    328         }
    329         if ((v >> 16) > index) {
    330           return false;
    331         }
    332       }
    333     }
    334   }
    335   return false;
    336 }
    337 
    338 // The following are some useful utilities for debugging
    339 
    340 BasicBlock *llvm::getParentBlock(Value *v) {
    341   if (BasicBlock *B = dyn_cast<BasicBlock>(v))
    342     return B;
    343 
    344   if (Instruction *I = dyn_cast<Instruction>(v))
    345     return I->getParent();
    346 
    347   return nullptr;
    348 }
    349 
    350 Function *llvm::getParentFunction(Value *v) {
    351   if (Function *F = dyn_cast<Function>(v))
    352     return F;
    353 
    354   if (Instruction *I = dyn_cast<Instruction>(v))
    355     return I->getParent()->getParent();
    356 
    357   if (BasicBlock *B = dyn_cast<BasicBlock>(v))
    358     return B->getParent();
    359 
    360   return nullptr;
    361 }
    362 
    363 // Dump a block by name
    364 void llvm::dumpBlock(Value *v, char *blockName) {
    365   Function *F = getParentFunction(v);
    366   if (!F)
    367     return;
    368 
    369   for (Function::iterator it = F->begin(), ie = F->end(); it != ie; ++it) {
    370     BasicBlock *B = &*it;
    371     if (strcmp(B->getName().data(), blockName) == 0) {
    372       B->dump();
    373       return;
    374     }
    375   }
    376 }
    377 
    378 // Find an instruction by name
    379 Instruction *llvm::getInst(Value *base, char *instName) {
    380   Function *F = getParentFunction(base);
    381   if (!F)
    382     return nullptr;
    383 
    384   for (inst_iterator it = inst_begin(F), ie = inst_end(F); it != ie; ++it) {
    385     Instruction *I = &*it;
    386     if (strcmp(I->getName().data(), instName) == 0) {
    387       return I;
    388     }
    389   }
    390 
    391   return nullptr;
    392 }
    393 
    394 // Dump an instruction by name
    395 void llvm::dumpInst(Value *base, char *instName) {
    396   Instruction *I = getInst(base, instName);
    397   if (I)
    398     I->dump();
    399 }
    400 
    401 // Dump an instruction and all dependent instructions
    402 void llvm::dumpInstRec(Value *v, std::set<Instruction *> *visited) {
    403   if (Instruction *I = dyn_cast<Instruction>(v)) {
    404 
    405     if (visited->find(I) != visited->end())
    406       return;
    407 
    408     visited->insert(I);
    409 
    410     for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
    411       dumpInstRec(I->getOperand(i), visited);
    412 
    413     I->dump();
    414   }
    415 }
    416 
    417 // Dump an instruction and all dependent instructions
    418 void llvm::dumpInstRec(Value *v) {
    419   std::set<Instruction *> visited;
    420 
    421   //BasicBlock *B = getParentBlock(v);
    422 
    423   dumpInstRec(v, &visited);
    424 }
    425 
    426 // Dump the parent for Instruction, block or function
    427 void llvm::dumpParent(Value *v) {
    428   if (Instruction *I = dyn_cast<Instruction>(v)) {
    429     I->getParent()->dump();
    430     return;
    431   }
    432 
    433   if (BasicBlock *B = dyn_cast<BasicBlock>(v)) {
    434     B->getParent()->dump();
    435     return;
    436   }
    437 
    438   if (Function *F = dyn_cast<Function>(v)) {
    439     F->getParent()->dump();
    440     return;
    441   }
    442 }
    443