LCOV - code coverage report
Current view: top level - lib/CodeGen/AsmPrinter - DebugLocEntry.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 29 43 67.4 %
Date: 2018-09-23 13:06:45 Functions: 5 12 41.7 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===-- llvm/CodeGen/DebugLocEntry.h - Entry in debug_loc list -*- C++ -*--===//
       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             : #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H
      11             : #define LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H
      12             : 
      13             : #include "DebugLocStream.h"
      14             : #include "llvm/Config/llvm-config.h"
      15             : #include "llvm/IR/Constants.h"
      16             : #include "llvm/IR/DebugInfo.h"
      17             : #include "llvm/MC/MCSymbol.h"
      18             : #include "llvm/MC/MachineLocation.h"
      19             : #include "llvm/Support/Debug.h"
      20             : 
      21             : namespace llvm {
      22             : class AsmPrinter;
      23             : 
      24             : /// This struct describes location entries emitted in the .debug_loc
      25             : /// section.
      26      275330 : class DebugLocEntry {
      27             :   /// Begin and end symbols for the address range that this location is valid.
      28             :   const MCSymbol *Begin;
      29             :   const MCSymbol *End;
      30             : 
      31             : public:
      32             :   /// A single location or constant.
      33             :   struct Value {
      34             :     Value(const DIExpression *Expr, int64_t i)
      35        1428 :         : Expression(Expr), EntryKind(E_Integer) {
      36         714 :       Constant.Int = i;
      37             :     }
      38             :     Value(const DIExpression *Expr, const ConstantFP *CFP)
      39          11 :         : Expression(Expr), EntryKind(E_ConstantFP) {
      40          11 :       Constant.CFP = CFP;
      41             :     }
      42             :     Value(const DIExpression *Expr, const ConstantInt *CIP)
      43           0 :         : Expression(Expr), EntryKind(E_ConstantInt) {
      44           0 :       Constant.CIP = CIP;
      45             :     }
      46             :     Value(const DIExpression *Expr, MachineLocation Loc)
      47      180908 :         : Expression(Expr), EntryKind(E_Location), Loc(Loc) {
      48             :       assert(cast<DIExpression>(Expr)->isValid());
      49             :     }
      50             : 
      51             :     /// Any complex address location expression for this Value.
      52             :     const DIExpression *Expression;
      53             : 
      54             :     /// Type of entry that this represents.
      55             :     enum EntryType { E_Location, E_Integer, E_ConstantFP, E_ConstantInt };
      56             :     enum EntryType EntryKind;
      57             : 
      58             :     /// Either a constant,
      59             :     union {
      60             :       int64_t Int;
      61             :       const ConstantFP *CFP;
      62             :       const ConstantInt *CIP;
      63             :     } Constant;
      64             : 
      65             :     // Or a location in the machine frame.
      66             :     MachineLocation Loc;
      67             : 
      68           0 :     bool isLocation() const { return EntryKind == E_Location; }
      69           0 :     bool isInt() const { return EntryKind == E_Integer; }
      70           0 :     bool isConstantFP() const { return EntryKind == E_ConstantFP; }
      71             :     bool isConstantInt() const { return EntryKind == E_ConstantInt; }
      72           0 :     int64_t getInt() const { return Constant.Int; }
      73           0 :     const ConstantFP *getConstantFP() const { return Constant.CFP; }
      74             :     const ConstantInt *getConstantInt() const { return Constant.CIP; }
      75           0 :     MachineLocation getLoc() const { return Loc; }
      76       79592 :     bool isFragment() const { return getExpression()->isFragment(); }
      77           0 :     const DIExpression *getExpression() const { return Expression; }
      78             :     friend bool operator==(const Value &, const Value &);
      79             :     friend bool operator<(const Value &, const Value &);
      80             : #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
      81             :     LLVM_DUMP_METHOD void dump() const {
      82             :       if (isLocation()) {
      83             :         llvm::dbgs() << "Loc = { reg=" << Loc.getReg() << " ";
      84             :         if (Loc.isIndirect())
      85             :           llvm::dbgs() << "+0";
      86             :         llvm::dbgs() << "} ";
      87             :       }
      88             :       else if (isConstantInt())
      89             :         Constant.CIP->dump();
      90             :       else if (isConstantFP())
      91             :         Constant.CFP->dump();
      92             :       if (Expression)
      93             :         Expression->dump();
      94             :     }
      95             : #endif
      96             :   };
      97             : 
      98             : private:
      99             :   /// A nonempty list of locations/constants belonging to this entry,
     100             :   /// sorted by offset.
     101             :   SmallVector<Value, 1> Values;
     102             : 
     103             : public:
     104             :   DebugLocEntry(const MCSymbol *B, const MCSymbol *E, Value Val)
     105      181633 :       : Begin(B), End(E) {
     106      181633 :     Values.push_back(std::move(Val));
     107             :   }
     108             : 
     109             :   /// If this and Next are describing different pieces of the same
     110             :   /// variable, merge them by appending Next's values to the current
     111             :   /// list of values.
     112             :   /// Return true if the merge was successful.
     113             :   bool MergeValues(const DebugLocEntry &Next);
     114             : 
     115             :   /// Attempt to merge this DebugLocEntry with Next and return
     116             :   /// true if the merge was successful. Entries can be merged if they
     117             :   /// share the same Loc/Constant and if Next immediately follows this
     118             :   /// Entry.
     119             :   bool MergeRanges(const DebugLocEntry &Next) {
     120             :     // If this and Next are describing the same variable, merge them.
     121      134590 :     if ((End == Next.Begin && Values == Next.Values)) {
     122      101922 :       End = Next.End;
     123             :       return true;
     124             :     }
     125             :     return false;
     126             :   }
     127             : 
     128             :   const MCSymbol *getBeginSym() const { return Begin; }
     129             :   const MCSymbol *getEndSym() const { return End; }
     130             :   ArrayRef<Value> getValues() const { return Values; }
     131         731 :   void addValues(ArrayRef<DebugLocEntry::Value> Vals) {
     132        1462 :     Values.append(Vals.begin(), Vals.end());
     133         731 :     sortUniqueValues();
     134             :     assert(all_of(Values, [](DebugLocEntry::Value V) {
     135             :           return V.isFragment();
     136             :         }) && "value must be a piece");
     137         731 :   }
     138             : 
     139             :   // Sort the pieces by offset.
     140             :   // Remove any duplicate entries by dropping all but the first.
     141         731 :   void sortUniqueValues() {
     142             :     llvm::sort(Values.begin(), Values.end());
     143             :     Values.erase(
     144             :         std::unique(
     145             :             Values.begin(), Values.end(), [](const Value &A, const Value &B) {
     146         984 :               return A.getExpression() == B.getExpression();
     147             :             }),
     148             :         Values.end());
     149         731 :   }
     150             : 
     151             :   /// Lower this entry into a DWARF expression.
     152             :   void finalize(const AsmPrinter &AP, DebugLocStream::ListBuilder &List,
     153             :                 const DIBasicType *BT);
     154             : };
     155             : 
     156             : /// Compare two Values for equality.
     157      121879 : inline bool operator==(const DebugLocEntry::Value &A,
     158             :                        const DebugLocEntry::Value &B) {
     159      121879 :   if (A.EntryKind != B.EntryKind)
     160             :     return false;
     161             : 
     162      121673 :   if (A.Expression != B.Expression)
     163             :     return false;
     164             : 
     165      115542 :   switch (A.EntryKind) {
     166      115504 :   case DebugLocEntry::Value::E_Location:
     167      115504 :     return A.Loc == B.Loc;
     168          38 :   case DebugLocEntry::Value::E_Integer:
     169          38 :     return A.Constant.Int == B.Constant.Int;
     170           0 :   case DebugLocEntry::Value::E_ConstantFP:
     171           0 :     return A.Constant.CFP == B.Constant.CFP;
     172           0 :   case DebugLocEntry::Value::E_ConstantInt:
     173           0 :     return A.Constant.CIP == B.Constant.CIP;
     174             :   }
     175           0 :   llvm_unreachable("unhandled EntryKind");
     176             : }
     177             : 
     178             : /// Compare two fragments based on their offset.
     179        2005 : inline bool operator<(const DebugLocEntry::Value &A,
     180             :                       const DebugLocEntry::Value &B) {
     181        2005 :   return A.getExpression()->getFragmentInfo()->OffsetInBits <
     182        2005 :          B.getExpression()->getFragmentInfo()->OffsetInBits;
     183             : }
     184             : 
     185             : }
     186             : 
     187             : #endif

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