index 5bc9ebc893ae2dc855ec415bc730dbc0d42b4534..a4e37e13841db51e7ed2b79a6c8ab23146b599ce 100644 (file)
#ifndef CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H__
#define CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H__
#include "llvm/IR/Constants.h"
+#include "llvm/IR/DebugInfo.h"
#include "llvm/MC/MachineLocation.h"
#include "llvm/MC/MCSymbol.h"
namespace llvm {
-class DwarfCompileUnit;
class MDNode;
/// \brief This struct describes location entries emitted in the .debug_loc
/// section.
const MCSymbol *Begin;
const MCSymbol *End;
- // Type of entry that this represents.
- enum EntryType { E_Location, E_Integer, E_ConstantFP, E_ConstantInt };
- enum EntryType EntryKind;
-
- union {
- int64_t Int;
- const ConstantFP *CFP;
- const ConstantInt *CIP;
- } Constants;
-
- // The location in the machine frame.
- MachineLocation Loc;
-
- // The variable to which this location entry corresponds.
- const MDNode *Variable;
-
- // The compile unit to which this location entry is referenced by.
- const DwarfCompileUnit *Unit;
-
- bool hasSameValueOrLocation(const DebugLocEntry &Next) {
- if (EntryKind != Next.EntryKind)
- return false;
-
- switch (EntryKind) {
- case E_Location:
- if (Loc != Next.Loc) return false;
- case E_Integer:
- if (Constants.Int != Next.Constants.Int) return false;
- case E_ConstantFP:
- if (Constants.CFP != Next.Constants.CFP) return false;
- case E_ConstantInt:
- if (Constants.CIP != Next.Constants.CIP) return false;
+public:
+ /// A single location or constant.
+ struct Value {
+ Value(const MDNode *Var, int64_t i)
+ : Variable(Var), EntryKind(E_Integer) {
+ Constant.Int = i;
+ }
+ Value(const MDNode *Var, const ConstantFP *CFP)
+ : Variable(Var), EntryKind(E_ConstantFP) {
+ Constant.CFP = CFP;
+ }
+ Value(const MDNode *Var, const ConstantInt *CIP)
+ : Variable(Var), EntryKind(E_ConstantInt) {
+ Constant.CIP = CIP;
+ }
+ Value(const MDNode *Var, MachineLocation Loc)
+ : Variable(Var), EntryKind(E_Location), Loc(Loc) {
}
- return true;
- }
+ // The variable to which this location entry corresponds.
+ const MDNode *Variable;
+
+ // Type of entry that this represents.
+ enum EntryType { E_Location, E_Integer, E_ConstantFP, E_ConstantInt };
+ enum EntryType EntryKind;
+
+ // Either a constant,
+ union {
+ int64_t Int;
+ const ConstantFP *CFP;
+ const ConstantInt *CIP;
+ } Constant;
+
+ // Or a location in the machine frame.
+ MachineLocation Loc;
+
+ bool isLocation() const { return EntryKind == E_Location; }
+ bool isInt() const { return EntryKind == E_Integer; }
+ bool isConstantFP() const { return EntryKind == E_ConstantFP; }
+ bool isConstantInt() const { return EntryKind == E_ConstantInt; }
+ int64_t getInt() const { return Constant.Int; }
+ const ConstantFP *getConstantFP() const { return Constant.CFP; }
+ const ConstantInt *getConstantInt() const { return Constant.CIP; }
+ MachineLocation getLoc() const { return Loc; }
+ const MDNode *getVariableNode() const { return Variable; }
+ DIVariable getVariable() const { return DIVariable(Variable); }
+ bool isVariablePiece() const { return getVariable().isVariablePiece(); }
+ friend bool operator==(const Value &, const Value &);
+ friend bool operator<(const Value &, const Value &);
+ };
+
+private:
+ /// A nonempty list of locations/constants belonging to this entry,
+ /// sorted by offset.
+ SmallVector<Value, 1> Values;
public:
- DebugLocEntry() : Begin(0), End(0), Variable(0), Unit(0) {
- Constants.Int = 0;
- }
- DebugLocEntry(const MCSymbol *B, const MCSymbol *E, MachineLocation &L,
- const MDNode *V, const DwarfCompileUnit *U)
- : Begin(B), End(E), Loc(L), Variable(V), Unit(U) {
- Constants.Int = 0;
- EntryKind = E_Location;
+ DebugLocEntry(const MCSymbol *B, const MCSymbol *E, Value Val)
+ : Begin(B), End(E) {
+ Values.push_back(std::move(Val));
}
- DebugLocEntry(const MCSymbol *B, const MCSymbol *E, int64_t i,
- const DwarfCompileUnit *U)
- : Begin(B), End(E), Variable(0), Unit(U) {
- Constants.Int = i;
- EntryKind = E_Integer;
- }
- DebugLocEntry(const MCSymbol *B, const MCSymbol *E, const ConstantFP *FPtr,
- const DwarfCompileUnit *U)
- : Begin(B), End(E), Variable(0), Unit(U) {
- Constants.CFP = FPtr;
- EntryKind = E_ConstantFP;
- }
- DebugLocEntry(const MCSymbol *B, const MCSymbol *E, const ConstantInt *IPtr,
- const DwarfCompileUnit *U)
- : Begin(B), End(E), Variable(0), Unit(U) {
- Constants.CIP = IPtr;
- EntryKind = E_ConstantInt;
+
+ /// \brief If this and Next are describing different pieces of the same
+ // variable, merge them by appending Next's values to the current
+ // list of values.
+ // Return true if the merge was successful.
+ bool MergeValues(const DebugLocEntry &Next) {
+ if (Begin == Next.Begin && Values.size() > 0 && Next.Values.size() > 0) {
+ DIVariable Var(Values[0].Variable);
+ DIVariable NextVar(Next.Values[0].Variable);
+ if (Var.getName() == NextVar.getName() &&
+ Var.isVariablePiece() && NextVar.isVariablePiece()) {
+ addValues(Next.Values);
+ End = Next.End;
+ return true;
+ }
+ }
+ return false;
}
- /// \brief Empty entries are also used as a trigger to emit temp label. Such
- /// labels are referenced is used to find debug_loc offset for a given DIE.
- bool isEmpty() const { return Begin == 0 && End == 0; }
- bool Merge(const DebugLocEntry &Next) {
- return End == Next.Begin && hasSameValueOrLocation(Next);
+ /// \brief Attempt to merge this DebugLocEntry with Next and return
+ /// true if the merge was successful. Entries can be merged if they
+ /// share the same Loc/Constant and if Next immediately follows this
+ /// Entry.
+ bool MergeRanges(const DebugLocEntry &Next) {
+ // If this and Next are describing the same variable, merge them.
+ if ((End == Next.Begin && Values == Next.Values)) {
+ End = Next.End;
+ return true;
+ }
+ return false;
}
- bool isLocation() const { return EntryKind == E_Location; }
- bool isInt() const { return EntryKind == E_Integer; }
- bool isConstantFP() const { return EntryKind == E_ConstantFP; }
- bool isConstantInt() const { return EntryKind == E_ConstantInt; }
- int64_t getInt() const { return Constants.Int; }
- const ConstantFP *getConstantFP() const { return Constants.CFP; }
- const ConstantInt *getConstantInt() const { return Constants.CIP; }
- const MDNode *getVariable() const { return Variable; }
+
const MCSymbol *getBeginSym() const { return Begin; }
const MCSymbol *getEndSym() const { return End; }
- const DwarfCompileUnit *getCU() const { return Unit; }
- MachineLocation getLoc() const { return Loc; }
+ const ArrayRef<Value> getValues() const { return Values; }
+ void addValues(ArrayRef<DebugLocEntry::Value> Vals) {
+ Values.append(Vals.begin(), Vals.end());
+ sortUniqueValues();
+ assert(std::all_of(Values.begin(), Values.end(), [](DebugLocEntry::Value V){
+ return V.isVariablePiece();
+ }) && "value must be a piece");
+ }
+
+ // Sort the pieces by offset.
+ // Remove any duplicate entries by dropping all but the first.
+ void sortUniqueValues() {
+ std::sort(Values.begin(), Values.end());
+ Values.erase(std::unique(Values.begin(), Values.end()), Values.end());
+ }
};
+/// Compare two Values for equality.
+inline bool operator==(const DebugLocEntry::Value &A,
+ const DebugLocEntry::Value &B) {
+ if (A.EntryKind != B.EntryKind)
+ return false;
+
+ if (A.getVariable() != B.getVariable())
+ return false;
+
+ switch (A.EntryKind) {
+ case DebugLocEntry::Value::E_Location:
+ return A.Loc == B.Loc;
+ case DebugLocEntry::Value::E_Integer:
+ return A.Constant.Int == B.Constant.Int;
+ case DebugLocEntry::Value::E_ConstantFP:
+ return A.Constant.CFP == B.Constant.CFP;
+ case DebugLocEntry::Value::E_ConstantInt:
+ return A.Constant.CIP == B.Constant.CIP;
+ }
+ llvm_unreachable("unhandled EntryKind");
+}
+
+/// Compare two pieces based on their offset.
+inline bool operator<(const DebugLocEntry::Value &A,
+ const DebugLocEntry::Value &B) {
+ return A.getVariable().getPieceOffset() < B.getVariable().getPieceOffset();
}
+
+}
+
#endif