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2a39c993eb
variables (for example, by-value struct arguments passed in registers, or large integer values split across several smaller registers). On the IR level, this adds a new type of complex address operation OpPiece to DIVariable that describes size and offset of a variable fragment. On the DWARF emitter level, all pieces describing the same variable are collected, sorted and emitted as DWARF expressions using the DW_OP_piece and DW_OP_bit_piece operators. http://reviews.llvm.org/D3373 rdar://problem/15928306 What this patch doesn't do / Future work: - This patch only adds the backend machinery to make this work, patches that change SROA and SelectionDAG's type legalizer to actually create such debug info will follow. (http://reviews.llvm.org/D2680) - Making the DIVariable complex expressions into an argument of dbg.value will reduce the memory footprint of the debug metadata. - The sorting/uniquing of pieces should be moved into DebugLocEntry, to facilitate the merging of multi-piece entries. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214576 91177308-0d34-0410-b5e6-96231b3b80d8
57 lines
2.1 KiB
C++
57 lines
2.1 KiB
C++
//===-- llvm/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h ----*- 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 CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H_
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#define CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H_
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#include "llvm/ADT/MapVector.h"
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#include "llvm/ADT/SmallVector.h"
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namespace llvm {
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class MachineFunction;
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class MachineInstr;
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class MDNode;
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class TargetRegisterInfo;
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// For each user variable, keep a list of instruction ranges where this variable
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// is accessible. The variables are listed in order of appearance.
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class DbgValueHistoryMap {
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// Each instruction range starts with a DBG_VALUE instruction, specifying the
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// location of a variable, which is assumed to be valid until the end of the
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// range. If end is not specified, location is valid until the start
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// instruction of the next instruction range, or until the end of the
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// function.
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public:
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typedef std::pair<const MachineInstr *, const MachineInstr *> InstrRange;
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typedef SmallVector<InstrRange, 4> InstrRanges;
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typedef MapVector<const MDNode *, InstrRanges> InstrRangesMap;
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private:
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InstrRangesMap VarInstrRanges;
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public:
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void startInstrRange(const MDNode *Var, const MachineInstr &MI);
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void endInstrRange(const MDNode *Var, const MachineInstr &MI);
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// Returns register currently describing @Var. If @Var is currently
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// unaccessible or is not described by a register, returns 0.
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unsigned getRegisterForVar(const MDNode *Var) const;
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bool empty() const { return VarInstrRanges.empty(); }
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void clear() { VarInstrRanges.clear(); }
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InstrRangesMap::const_iterator begin() const { return VarInstrRanges.begin(); }
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InstrRangesMap::const_iterator end() const { return VarInstrRanges.end(); }
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};
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void calculateDbgValueHistory(const MachineFunction *MF,
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const TargetRegisterInfo *TRI,
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DbgValueHistoryMap &Result);
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}
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#endif
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