Eugene Zelenko | 1df42fa | 2017-04-24 23:21:38 +0000 | [diff] [blame] | 1 | //===- RecordStreamer.h - Record asm defined and used symbols ---*- C++ -*-===// |
Rafael Espindola | 13b69d6 | 2014-07-03 18:59:23 +0000 | [diff] [blame] | 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
Benjamin Kramer | a7c40ef | 2014-08-13 16:26:38 +0000 | [diff] [blame] | 10 | #ifndef LLVM_LIB_OBJECT_RECORDSTREAMER_H |
| 11 | #define LLVM_LIB_OBJECT_RECORDSTREAMER_H |
Rafael Espindola | 13b69d6 | 2014-07-03 18:59:23 +0000 | [diff] [blame] | 12 | |
Eugene Zelenko | 1df42fa | 2017-04-24 23:21:38 +0000 | [diff] [blame] | 13 | #include "llvm/ADT/DenseMap.h" |
| 14 | #include "llvm/ADT/StringMap.h" |
| 15 | #include "llvm/MC/MCDirectives.h" |
Rafael Espindola | 13b69d6 | 2014-07-03 18:59:23 +0000 | [diff] [blame] | 16 | #include "llvm/MC/MCStreamer.h" |
Eugene Zelenko | 1df42fa | 2017-04-24 23:21:38 +0000 | [diff] [blame] | 17 | #include "llvm/MC/MCSymbol.h" |
| 18 | #include "llvm/Support/SMLoc.h" |
| 19 | #include <vector> |
Rafael Espindola | 13b69d6 | 2014-07-03 18:59:23 +0000 | [diff] [blame] | 20 | |
| 21 | namespace llvm { |
Eugene Zelenko | 1df42fa | 2017-04-24 23:21:38 +0000 | [diff] [blame] | 22 | |
Rafael Espindola | 13b69d6 | 2014-07-03 18:59:23 +0000 | [diff] [blame] | 23 | class RecordStreamer : public MCStreamer { |
| 24 | public: |
Davide Italiano | f751849 | 2016-09-15 17:54:22 +0000 | [diff] [blame] | 25 | enum State { NeverSeen, Global, Defined, DefinedGlobal, DefinedWeak, Used, |
| 26 | UndefinedWeak}; |
Rafael Espindola | 13b69d6 | 2014-07-03 18:59:23 +0000 | [diff] [blame] | 27 | |
| 28 | private: |
| 29 | StringMap<State> Symbols; |
Teresa Johnson | d820447 | 2017-03-09 00:19:49 +0000 | [diff] [blame] | 30 | // Map of aliases created by .symver directives, saved so we can update |
| 31 | // their symbol binding after parsing complete. This maps from each |
| 32 | // aliasee to its list of aliases. |
| 33 | DenseMap<const MCSymbol *, std::vector<MCSymbol *>> SymverAliasMap; |
Eugene Zelenko | 1df42fa | 2017-04-24 23:21:38 +0000 | [diff] [blame] | 34 | |
Rafael Espindola | 13b69d6 | 2014-07-03 18:59:23 +0000 | [diff] [blame] | 35 | void markDefined(const MCSymbol &Symbol); |
Davide Italiano | ec7e29e | 2016-06-22 20:48:15 +0000 | [diff] [blame] | 36 | void markGlobal(const MCSymbol &Symbol, MCSymbolAttr Attribute); |
Rafael Espindola | 13b69d6 | 2014-07-03 18:59:23 +0000 | [diff] [blame] | 37 | void markUsed(const MCSymbol &Symbol); |
| 38 | void visitUsedSymbol(const MCSymbol &Sym) override; |
| 39 | |
| 40 | public: |
Eugene Zelenko | 1df42fa | 2017-04-24 23:21:38 +0000 | [diff] [blame] | 41 | RecordStreamer(MCContext &Context); |
| 42 | |
| 43 | using const_iterator = StringMap<State>::const_iterator; |
| 44 | |
Rafael Espindola | 13b69d6 | 2014-07-03 18:59:23 +0000 | [diff] [blame] | 45 | const_iterator begin(); |
| 46 | const_iterator end(); |
Andrew V. Tischenko | 75745d0 | 2017-04-14 07:44:23 +0000 | [diff] [blame] | 47 | void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI, |
| 48 | bool) override; |
Rafael Espindola | be99157 | 2017-02-10 15:13:12 +0000 | [diff] [blame] | 49 | void EmitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override; |
Rafael Espindola | 13b69d6 | 2014-07-03 18:59:23 +0000 | [diff] [blame] | 50 | void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override; |
| 51 | bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override; |
Rafael Espindola | 0709a7b | 2015-05-21 19:20:38 +0000 | [diff] [blame] | 52 | void EmitZerofill(MCSection *Section, MCSymbol *Symbol, uint64_t Size, |
Rafael Espindola | 13b69d6 | 2014-07-03 18:59:23 +0000 | [diff] [blame] | 53 | unsigned ByteAlignment) override; |
| 54 | void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, |
| 55 | unsigned ByteAlignment) override; |
Teresa Johnson | d820447 | 2017-03-09 00:19:49 +0000 | [diff] [blame] | 56 | /// Record .symver aliases for later processing. |
| 57 | void emitELFSymverDirective(MCSymbol *Alias, |
| 58 | const MCSymbol *Aliasee) override; |
| 59 | /// Return the map of .symver aliasee to associated aliases. |
| 60 | DenseMap<const MCSymbol *, std::vector<MCSymbol *>> &symverAliases() { |
| 61 | return SymverAliasMap; |
| 62 | } |
Eugene Zelenko | 1df42fa | 2017-04-24 23:21:38 +0000 | [diff] [blame] | 63 | |
Teresa Johnson | d820447 | 2017-03-09 00:19:49 +0000 | [diff] [blame] | 64 | /// Get the state recorded for the given symbol. |
| 65 | State getSymbolState(const MCSymbol *Sym) { |
| 66 | auto SI = Symbols.find(Sym->getName()); |
| 67 | if (SI == Symbols.end()) |
| 68 | return NeverSeen; |
| 69 | return SI->second; |
| 70 | } |
Rafael Espindola | 13b69d6 | 2014-07-03 18:59:23 +0000 | [diff] [blame] | 71 | }; |
Eugene Zelenko | 1df42fa | 2017-04-24 23:21:38 +0000 | [diff] [blame] | 72 | |
| 73 | } // end namespace llvm |
| 74 | |
| 75 | #endif // LLVM_LIB_OBJECT_RECORDSTREAMER_H |