lib/CodeGen/ELFCodeEmitter.h

   1 //===-- lib/CodeGen/ELFCodeEmitter.h ----------------------------*- C++ -*-===//
   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
  10 #ifndef ELFCODEEMITTER_H
  11 #define ELFCODEEMITTER_H
  12
  13 #include "llvm/CodeGen/ObjectCodeEmitter.h"
  14 #include <vector>
  15
  16 namespace llvm {
  17   class ELFWriter;
  18   class ELFSection;
  19
  20   /// ELFCodeEmitter - This class is used by the ELFWriter to
  21   /// emit the code for functions to the ELF file.
  22   class ELFCodeEmitter : public ObjectCodeEmitter {
  23     ELFWriter &EW;
  24
  25     /// Target machine description
  26     TargetMachine &TM;
  27
  28     /// Section containing code for functions
  29     ELFSection *ES;
  30
  31     /// Relocations - Record relocations needed by the current function
  32     std::vector<MachineRelocation> Relocations;
  33
  34     /// JTRelocations - Record relocations needed by the relocation
  35     /// section.
  36     std::vector<MachineRelocation> JTRelocations;
  37
  38     /// FnStartPtr - Function offset from the beginning of ELFSection 'ES'
  39     uintptr_t FnStartOff;
  40   public:
  41     explicit ELFCodeEmitter(ELFWriter &ew) : EW(ew), TM(EW.TM) {}
  42
  43     /// addRelocation - Register new relocations for this function
  44     void addRelocation(const MachineRelocation &MR) {
  45       Relocations.push_back(MR);
  46     }
  47
  48     /// emitConstantPool - For each constant pool entry, figure out which
  49     /// section the constant should live in and emit data to it
  50     void emitConstantPool(MachineConstantPool *MCP);
  51
  52     /// emitJumpTables - Emit all the jump tables for a given jump table
  53     /// info and record them to the appropriate section.
  54     void emitJumpTables(MachineJumpTableInfo *MJTI);
  55
  56     void startFunction(MachineFunction &F);
  57     bool finishFunction(MachineFunction &F);
  58
  59     /// emitLabel - Emits a label
  60     virtual void emitLabel(MCSymbol *Label) {
  61       assert("emitLabel not implemented");
  62     }
  63
  64     /// getLabelAddress - Return the address of the specified LabelID,
  65     /// only usable after the LabelID has been emitted.
  66     virtual uintptr_t getLabelAddress(MCSymbol *Label) const {
  67       assert("getLabelAddress not implemented");
  68       return 0;
  69     }
  70
  71     virtual void setModuleInfo(llvm::MachineModuleInfo* MMI) {}
  72
  73 };  // end class ELFCodeEmitter
  74
  75 } // end namespace llvm
  76
  77 #endif
  78