mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 04:02:41 +01:00
782c047ef4
This is a partial reapply of the original commit and the followup commit that were previously reverted; this reapply also includes a small fix for a potential source of non-determinism, but also has a small change to turn off variadic debug value salvaging, to ensure that any future revert/reapply steps to disable and renable this feature do not risk causing conflicts. Differential Revision: https://reviews.llvm.org/D91722 This reverts commit 386b66b2fc297cda121a3cc8a36887a6ecbcfc68.
268 lines
8.9 KiB
C++
268 lines
8.9 KiB
C++
//===-- llvm/CodeGen/DebugLocEntry.h - Entry in debug_loc list -*- C++ -*--===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H
|
|
#define LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H
|
|
|
|
#include "DebugLocStream.h"
|
|
#include "llvm/Config/llvm-config.h"
|
|
#include "llvm/IR/Constants.h"
|
|
#include "llvm/IR/DebugInfo.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/MC/MachineLocation.h"
|
|
#include "llvm/Support/Debug.h"
|
|
|
|
namespace llvm {
|
|
class AsmPrinter;
|
|
|
|
/// This struct describes target specific location.
|
|
struct TargetIndexLocation {
|
|
int Index;
|
|
int Offset;
|
|
|
|
TargetIndexLocation() = default;
|
|
TargetIndexLocation(unsigned Idx, int64_t Offset)
|
|
: Index(Idx), Offset(Offset) {}
|
|
|
|
bool operator==(const TargetIndexLocation &Other) const {
|
|
return Index == Other.Index && Offset == Other.Offset;
|
|
}
|
|
};
|
|
|
|
/// A single location or constant within a variable location description, with
|
|
/// either a single entry (with an optional DIExpression) used for a DBG_VALUE,
|
|
/// or a list of entries used for a DBG_VALUE_LIST.
|
|
class DbgValueLocEntry {
|
|
|
|
/// Type of entry that this represents.
|
|
enum EntryType {
|
|
E_Location,
|
|
E_Integer,
|
|
E_ConstantFP,
|
|
E_ConstantInt,
|
|
E_TargetIndexLocation
|
|
};
|
|
enum EntryType EntryKind;
|
|
|
|
/// Either a constant,
|
|
union {
|
|
int64_t Int;
|
|
const ConstantFP *CFP;
|
|
const ConstantInt *CIP;
|
|
} Constant;
|
|
|
|
union {
|
|
/// Or a location in the machine frame.
|
|
MachineLocation Loc;
|
|
/// Or a location from target specific location.
|
|
TargetIndexLocation TIL;
|
|
};
|
|
|
|
public:
|
|
DbgValueLocEntry(int64_t i) : EntryKind(E_Integer) { Constant.Int = i; }
|
|
DbgValueLocEntry(const ConstantFP *CFP) : EntryKind(E_ConstantFP) {
|
|
Constant.CFP = CFP;
|
|
}
|
|
DbgValueLocEntry(const ConstantInt *CIP) : EntryKind(E_ConstantInt) {
|
|
Constant.CIP = CIP;
|
|
}
|
|
DbgValueLocEntry(MachineLocation Loc) : EntryKind(E_Location), Loc(Loc) {}
|
|
DbgValueLocEntry(TargetIndexLocation Loc)
|
|
: EntryKind(E_TargetIndexLocation), TIL(Loc) {}
|
|
|
|
bool isLocation() const { return EntryKind == E_Location; }
|
|
bool isTargetIndexLocation() const {
|
|
return EntryKind == E_TargetIndexLocation;
|
|
}
|
|
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; }
|
|
TargetIndexLocation getTargetIndexLocation() const { return TIL; }
|
|
friend bool operator==(const DbgValueLocEntry &, const DbgValueLocEntry &);
|
|
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
|
|
LLVM_DUMP_METHOD void dump() const {
|
|
if (isLocation()) {
|
|
llvm::dbgs() << "Loc = { reg=" << Loc.getReg() << " ";
|
|
if (Loc.isIndirect())
|
|
llvm::dbgs() << "+0";
|
|
llvm::dbgs() << "} ";
|
|
} else if (isConstantInt())
|
|
Constant.CIP->dump();
|
|
else if (isConstantFP())
|
|
Constant.CFP->dump();
|
|
}
|
|
#endif
|
|
};
|
|
|
|
/// The location of a single variable, composed of an expression and 0 or more
|
|
/// DbgValueLocEntries.
|
|
class DbgValueLoc {
|
|
/// Any complex address location expression for this DbgValueLoc.
|
|
const DIExpression *Expression;
|
|
|
|
SmallVector<DbgValueLocEntry, 2> ValueLocEntries;
|
|
|
|
bool IsVariadic;
|
|
|
|
public:
|
|
DbgValueLoc(const DIExpression *Expr, ArrayRef<DbgValueLocEntry> Locs)
|
|
: Expression(Expr), ValueLocEntries(Locs.begin(), Locs.end()),
|
|
IsVariadic(true) {
|
|
#ifndef NDEBUG
|
|
// Currently, DBG_VALUE_VAR expressions must use stack_value.
|
|
assert(Expr && Expr->isValid() &&
|
|
is_contained(Locs, dwarf::DW_OP_stack_value));
|
|
#endif
|
|
}
|
|
|
|
DbgValueLoc(const DIExpression *Expr, ArrayRef<DbgValueLocEntry> Locs,
|
|
bool IsVariadic)
|
|
: Expression(Expr), ValueLocEntries(Locs.begin(), Locs.end()),
|
|
IsVariadic(IsVariadic) {
|
|
#ifndef NDEBUG
|
|
assert(cast<DIExpression>(Expr)->isValid() ||
|
|
!any_of(Locs, [](auto LE) { return LE.isLocation(); }));
|
|
if (!IsVariadic) {
|
|
assert(ValueLocEntries.size() == 1);
|
|
} else {
|
|
// Currently, DBG_VALUE_VAR expressions must use stack_value.
|
|
assert(Expr && Expr->isValid() &&
|
|
is_contained(Expr->getElements(), dwarf::DW_OP_stack_value));
|
|
}
|
|
#endif
|
|
}
|
|
|
|
DbgValueLoc(const DIExpression *Expr, DbgValueLocEntry Loc)
|
|
: Expression(Expr), ValueLocEntries(1, Loc), IsVariadic(false) {
|
|
assert(((Expr && Expr->isValid()) || !Loc.isLocation()) &&
|
|
"DBG_VALUE with a machine location must have a valid expression.");
|
|
}
|
|
|
|
bool isFragment() const { return getExpression()->isFragment(); }
|
|
bool isEntryVal() const { return getExpression()->isEntryValue(); }
|
|
bool isVariadic() const { return IsVariadic; }
|
|
const DIExpression *getExpression() const { return Expression; }
|
|
const ArrayRef<DbgValueLocEntry> getLocEntries() const {
|
|
return ValueLocEntries;
|
|
}
|
|
friend bool operator==(const DbgValueLoc &, const DbgValueLoc &);
|
|
friend bool operator<(const DbgValueLoc &, const DbgValueLoc &);
|
|
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
|
|
LLVM_DUMP_METHOD void dump() const {
|
|
for (DbgValueLocEntry DV : ValueLocEntries)
|
|
DV.dump();
|
|
if (Expression)
|
|
Expression->dump();
|
|
}
|
|
#endif
|
|
};
|
|
|
|
/// 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.
|
|
const MCSymbol *Begin;
|
|
const MCSymbol *End;
|
|
|
|
/// A nonempty list of locations/constants belonging to this entry,
|
|
/// sorted by offset.
|
|
SmallVector<DbgValueLoc, 1> Values;
|
|
|
|
public:
|
|
/// Create a location list entry for the range [\p Begin, \p End).
|
|
///
|
|
/// \param Vals One or more values describing (parts of) the variable.
|
|
DebugLocEntry(const MCSymbol *Begin, const MCSymbol *End,
|
|
ArrayRef<DbgValueLoc> Vals)
|
|
: Begin(Begin), End(End) {
|
|
addValues(Vals);
|
|
}
|
|
|
|
/// 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;
|
|
}
|
|
|
|
const MCSymbol *getBeginSym() const { return Begin; }
|
|
const MCSymbol *getEndSym() const { return End; }
|
|
ArrayRef<DbgValueLoc> getValues() const { return Values; }
|
|
void addValues(ArrayRef<DbgValueLoc> Vals) {
|
|
Values.append(Vals.begin(), Vals.end());
|
|
sortUniqueValues();
|
|
assert((Values.size() == 1 || all_of(Values, [](DbgValueLoc V) {
|
|
return V.isFragment();
|
|
})) && "must either have a single value or multiple pieces");
|
|
}
|
|
|
|
// Sort the pieces by offset.
|
|
// Remove any duplicate entries by dropping all but the first.
|
|
void sortUniqueValues() {
|
|
llvm::sort(Values);
|
|
Values.erase(std::unique(Values.begin(), Values.end(),
|
|
[](const DbgValueLoc &A, const DbgValueLoc &B) {
|
|
return A.getExpression() == B.getExpression();
|
|
}),
|
|
Values.end());
|
|
}
|
|
|
|
/// Lower this entry into a DWARF expression.
|
|
void finalize(const AsmPrinter &AP,
|
|
DebugLocStream::ListBuilder &List,
|
|
const DIBasicType *BT,
|
|
DwarfCompileUnit &TheCU);
|
|
};
|
|
|
|
/// Compare two DbgValueLocEntries for equality.
|
|
inline bool operator==(const DbgValueLocEntry &A, const DbgValueLocEntry &B) {
|
|
if (A.EntryKind != B.EntryKind)
|
|
return false;
|
|
|
|
switch (A.EntryKind) {
|
|
case DbgValueLocEntry::E_Location:
|
|
return A.Loc == B.Loc;
|
|
case DbgValueLocEntry::E_TargetIndexLocation:
|
|
return A.TIL == B.TIL;
|
|
case DbgValueLocEntry::E_Integer:
|
|
return A.Constant.Int == B.Constant.Int;
|
|
case DbgValueLocEntry::E_ConstantFP:
|
|
return A.Constant.CFP == B.Constant.CFP;
|
|
case DbgValueLocEntry::E_ConstantInt:
|
|
return A.Constant.CIP == B.Constant.CIP;
|
|
}
|
|
llvm_unreachable("unhandled EntryKind");
|
|
}
|
|
|
|
/// Compare two DbgValueLocs for equality.
|
|
inline bool operator==(const DbgValueLoc &A, const DbgValueLoc &B) {
|
|
return A.ValueLocEntries == B.ValueLocEntries &&
|
|
A.Expression == B.Expression && A.IsVariadic == B.IsVariadic;
|
|
}
|
|
|
|
/// Compare two fragments based on their offset.
|
|
inline bool operator<(const DbgValueLoc &A,
|
|
const DbgValueLoc &B) {
|
|
return A.getExpression()->getFragmentInfo()->OffsetInBits <
|
|
B.getExpression()->getFragmentInfo()->OffsetInBits;
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|