//
//===----------------------------------------------------------------------===//
-#ifndef CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H__
-#define CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H__
+#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H
+#define LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H
+
+#include "DebugLocStream.h"
+#include "llvm/ADT/SmallString.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfo.h"
-#include "llvm/MC/MachineLocation.h"
#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MachineLocation.h"
namespace llvm {
-class MDNode;
+class AsmPrinter;
+
/// \brief This struct describes location entries emitted in the .debug_loc
/// section.
class DebugLocEntry {
- // Begin and end symbols for the address range that this location is valid.
+ /// Begin and end symbols for the address range that this location is valid.
const MCSymbol *Begin;
const MCSymbol *End;
public:
- /// A single location or constant.
+ /// \brief A single location or constant.
struct Value {
- Value(const MDNode *Var, int64_t i)
- : Variable(Var), EntryKind(E_Integer) {
+ Value(const DIExpression *Expr, int64_t i)
+ : Expression(Expr), EntryKind(E_Integer) {
Constant.Int = i;
}
- Value(const MDNode *Var, const ConstantFP *CFP)
- : Variable(Var), EntryKind(E_ConstantFP) {
+ Value(const DIExpression *Expr, const ConstantFP *CFP)
+ : Expression(Expr), EntryKind(E_ConstantFP) {
Constant.CFP = CFP;
}
- Value(const MDNode *Var, const ConstantInt *CIP)
- : Variable(Var), EntryKind(E_ConstantInt) {
+ Value(const DIExpression *Expr, const ConstantInt *CIP)
+ : Expression(Expr), EntryKind(E_ConstantInt) {
Constant.CIP = CIP;
}
- Value(const MDNode *Var, MachineLocation Loc)
- : Variable(Var), EntryKind(E_Location), Loc(Loc) {
+ Value(const DIExpression *Expr, MachineLocation Loc)
+ : Expression(Expr), EntryKind(E_Location), Loc(Loc) {
+ assert(cast<DIExpression>(Expr)->isValid());
}
- // The variable to which this location entry corresponds.
- const MDNode *Variable;
+ /// Any complex address location expression for this Value.
+ const DIExpression *Expression;
- // Type of entry that this represents.
+ /// Type of entry that this represents.
enum EntryType { E_Location, E_Integer, E_ConstantFP, E_ConstantInt };
enum EntryType EntryKind;
- // Either a constant,
+ /// Either a constant,
union {
int64_t Int;
const ConstantFP *CFP;
// Or a location in the machine frame.
MachineLocation Loc;
- bool operator==(const Value &other) const {
- if (EntryKind != other.EntryKind)
- return false;
-
- switch (EntryKind) {
- case E_Location:
- return Loc == other.Loc;
- case E_Integer:
- return Constant.Int == other.Constant.Int;
- case E_ConstantFP:
- return Constant.CFP == other.Constant.CFP;
- case E_ConstantInt:
- return Constant.CIP == other.Constant.CIP;
- }
- llvm_unreachable("unhandled EntryKind");
- }
-
bool isLocation() const { return EntryKind == E_Location; }
bool isInt() const { return EntryKind == E_Integer; }
bool isConstantFP() const { return EntryKind == E_ConstantFP; }
const ConstantFP *getConstantFP() const { return Constant.CFP; }
const ConstantInt *getConstantInt() const { return Constant.CIP; }
MachineLocation getLoc() const { return Loc; }
- const MDNode *getVariable() const { return Variable; }
+ bool isBitPiece() const { return getExpression()->isBitPiece(); }
+ const DIExpression *getExpression() const { return Expression; }
+ friend bool operator==(const Value &, const Value &);
+ friend bool operator<(const Value &, const Value &);
};
+
private:
- /// A list of locations/constants belonging to this entry.
+ /// A nonempty list of locations/constants belonging to this entry,
+ /// sorted by offset.
SmallVector<Value, 1> Values;
public:
- DebugLocEntry() : Begin(nullptr), End(nullptr) {}
DebugLocEntry(const MCSymbol *B, const MCSymbol *E, Value Val)
: Begin(B), End(E) {
Values.push_back(std::move(Val));
}
+ /// \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);
+
/// \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 Merge(const DebugLocEntry &Next) {
- // 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.
- 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()) {
- Values.append(Next.Values.begin(), Next.Values.end());
- End = Next.End;
- return true;
- }
- }
+ 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;
const MCSymbol *getBeginSym() const { return Begin; }
const MCSymbol *getEndSym() const { return End; }
- const ArrayRef<Value> getValues() const { return Values; }
- void addValue(Value Val) {
- assert(DIVariable(Val.Variable).isVariablePiece() &&
- "multi-value DebugLocEntries must be pieces");
- Values.push_back(Val);
+ 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.isBitPiece();
+ }) && "value must be a piece");
+ }
+
+ // \brief 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(), [](const Value &A, const Value &B) {
+ return A.getExpression() == B.getExpression();
+ }),
+ Values.end());
}
+
+ /// \brief Lower this entry into a DWARF expression.
+ void finalize(const AsmPrinter &AP, DebugLocStream::ListBuilder &List,
+ const DIBasicType *BT);
};
+/// \brief 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.Expression != B.Expression)
+ 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");
}
+
+/// \brief Compare two pieces based on their offset.
+inline bool operator<(const DebugLocEntry::Value &A,
+ const DebugLocEntry::Value &B) {
+ return A.getExpression()->getBitPieceOffset() <
+ B.getExpression()->getBitPieceOffset();
+}
+
+}
+
#endif
projects / oota-llvm.git / blobdiff