forked from OSchip/llvm-project
188 lines
6.1 KiB
C++
188 lines
6.1 KiB
C++
//===-- llvm/CodeGen/DebugLocEntry.h - Entry in debug_loc list -*- C++ -*--===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H
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#define LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H
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#include "DebugLocStream.h"
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#include "llvm/Config/llvm-config.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DebugInfo.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MachineLocation.h"
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#include "llvm/Support/Debug.h"
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namespace llvm {
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class AsmPrinter;
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/// This struct describes location entries emitted in the .debug_loc
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/// section.
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class DebugLocEntry {
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/// Begin and end symbols for the address range that this location is valid.
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const MCSymbol *Begin;
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const MCSymbol *End;
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public:
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/// A single location or constant.
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struct Value {
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Value(const DIExpression *Expr, int64_t i)
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: Expression(Expr), EntryKind(E_Integer) {
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Constant.Int = i;
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}
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Value(const DIExpression *Expr, const ConstantFP *CFP)
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: Expression(Expr), EntryKind(E_ConstantFP) {
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Constant.CFP = CFP;
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}
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Value(const DIExpression *Expr, const ConstantInt *CIP)
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: Expression(Expr), EntryKind(E_ConstantInt) {
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Constant.CIP = CIP;
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}
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Value(const DIExpression *Expr, MachineLocation Loc)
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: Expression(Expr), EntryKind(E_Location), Loc(Loc) {
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assert(cast<DIExpression>(Expr)->isValid());
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}
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/// Any complex address location expression for this Value.
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const DIExpression *Expression;
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/// Type of entry that this represents.
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enum EntryType { E_Location, E_Integer, E_ConstantFP, E_ConstantInt };
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enum EntryType EntryKind;
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/// Either a constant,
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union {
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int64_t Int;
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const ConstantFP *CFP;
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const ConstantInt *CIP;
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} Constant;
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// Or a location in the machine frame.
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MachineLocation Loc;
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bool isLocation() const { return EntryKind == E_Location; }
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bool isInt() const { return EntryKind == E_Integer; }
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bool isConstantFP() const { return EntryKind == E_ConstantFP; }
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bool isConstantInt() const { return EntryKind == E_ConstantInt; }
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int64_t getInt() const { return Constant.Int; }
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const ConstantFP *getConstantFP() const { return Constant.CFP; }
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const ConstantInt *getConstantInt() const { return Constant.CIP; }
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MachineLocation getLoc() const { return Loc; }
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bool isFragment() const { return getExpression()->isFragment(); }
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const DIExpression *getExpression() const { return Expression; }
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friend bool operator==(const Value &, const Value &);
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friend bool operator<(const Value &, const Value &);
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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LLVM_DUMP_METHOD void dump() const {
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if (isLocation()) {
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llvm::dbgs() << "Loc = { reg=" << Loc.getReg() << " ";
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if (Loc.isIndirect())
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llvm::dbgs() << "+0";
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llvm::dbgs() << "} ";
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}
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else if (isConstantInt())
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Constant.CIP->dump();
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else if (isConstantFP())
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Constant.CFP->dump();
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if (Expression)
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Expression->dump();
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}
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#endif
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};
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private:
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/// A nonempty list of locations/constants belonging to this entry,
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/// sorted by offset.
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SmallVector<Value, 1> Values;
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public:
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DebugLocEntry(const MCSymbol *B, const MCSymbol *E, Value Val)
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: Begin(B), End(E) {
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Values.push_back(std::move(Val));
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}
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/// If this and Next are describing different pieces of the same
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/// variable, merge them by appending Next's values to the current
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/// list of values.
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/// Return true if the merge was successful.
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bool MergeValues(const DebugLocEntry &Next);
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/// Attempt to merge this DebugLocEntry with Next and return
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/// true if the merge was successful. Entries can be merged if they
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/// share the same Loc/Constant and if Next immediately follows this
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/// Entry.
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bool MergeRanges(const DebugLocEntry &Next) {
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// If this and Next are describing the same variable, merge them.
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if ((End == Next.Begin && Values == Next.Values)) {
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End = Next.End;
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return true;
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}
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return false;
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}
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const MCSymbol *getBeginSym() const { return Begin; }
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const MCSymbol *getEndSym() const { return End; }
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ArrayRef<Value> getValues() const { return Values; }
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void addValues(ArrayRef<DebugLocEntry::Value> Vals) {
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Values.append(Vals.begin(), Vals.end());
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sortUniqueValues();
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assert(all_of(Values, [](DebugLocEntry::Value V) {
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return V.isFragment();
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}) && "value must be a piece");
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}
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// Sort the pieces by offset.
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// Remove any duplicate entries by dropping all but the first.
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void sortUniqueValues() {
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llvm::sort(Values.begin(), Values.end());
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Values.erase(
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std::unique(
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Values.begin(), Values.end(), [](const Value &A, const Value &B) {
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return A.getExpression() == B.getExpression();
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}),
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Values.end());
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}
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/// Lower this entry into a DWARF expression.
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void finalize(const AsmPrinter &AP, DebugLocStream::ListBuilder &List,
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const DIBasicType *BT);
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};
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/// Compare two Values for equality.
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inline bool operator==(const DebugLocEntry::Value &A,
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const DebugLocEntry::Value &B) {
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if (A.EntryKind != B.EntryKind)
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return false;
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if (A.Expression != B.Expression)
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return false;
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switch (A.EntryKind) {
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case DebugLocEntry::Value::E_Location:
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return A.Loc == B.Loc;
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case DebugLocEntry::Value::E_Integer:
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return A.Constant.Int == B.Constant.Int;
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case DebugLocEntry::Value::E_ConstantFP:
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return A.Constant.CFP == B.Constant.CFP;
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case DebugLocEntry::Value::E_ConstantInt:
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return A.Constant.CIP == B.Constant.CIP;
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}
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llvm_unreachable("unhandled EntryKind");
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}
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/// Compare two fragments based on their offset.
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inline bool operator<(const DebugLocEntry::Value &A,
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const DebugLocEntry::Value &B) {
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return A.getExpression()->getFragmentInfo()->OffsetInBits <
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B.getExpression()->getFragmentInfo()->OffsetInBits;
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}
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}
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#endif
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