//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Bill Wendling and is distributed under the
-// University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
namespace llvm {
- class MachineBasicBlock;
-
//===--------------------------------------------------------------------===//
// TargetELFWriterInfo
//===--------------------------------------------------------------------===//
class TargetELFWriterInfo {
+ protected:
// EMachine - This field is the target specific value to emit as the
// e_machine member of the ELF header.
unsigned short EMachine;
+ bool is64Bit, isLittleEndian;
public:
+
+ // Machine architectures
enum MachineType {
- NoMachine,
- EM_386 = 3
+ EM_NONE = 0, // No machine
+ EM_M32 = 1, // AT&T WE 32100
+ EM_SPARC = 2, // SPARC
+ EM_386 = 3, // Intel 386
+ EM_68K = 4, // Motorola 68000
+ EM_88K = 5, // Motorola 88000
+ EM_486 = 6, // Intel 486 (deprecated)
+ EM_860 = 7, // Intel 80860
+ EM_MIPS = 8, // MIPS R3000
+ EM_PPC = 20, // PowerPC
+ EM_ARM = 40, // ARM
+ EM_ALPHA = 41, // DEC Alpha
+ EM_SPARCV9 = 43, // SPARC V9
+ EM_X86_64 = 62, // AMD64
+ EM_HEXAGON = 164 // Qualcomm Hexagon
};
- explicit TargetELFWriterInfo(MachineType machine) : EMachine(machine) {}
- virtual ~TargetELFWriterInfo() {}
+ // ELF File classes
+ enum {
+ ELFCLASS32 = 1, // 32-bit object file
+ ELFCLASS64 = 2 // 64-bit object file
+ };
+
+ // ELF Endianess
+ enum {
+ ELFDATA2LSB = 1, // Little-endian object file
+ ELFDATA2MSB = 2 // Big-endian object file
+ };
+
+ explicit TargetELFWriterInfo(bool is64Bit_, bool isLittleEndian_);
+ virtual ~TargetELFWriterInfo();
unsigned short getEMachine() const { return EMachine; }
+ unsigned getEFlags() const { return 0; }
+ unsigned getEIClass() const { return is64Bit ? ELFCLASS64 : ELFCLASS32; }
+ unsigned getEIData() const {
+ return isLittleEndian ? ELFDATA2LSB : ELFDATA2MSB;
+ }
+
+ /// ELF Header and ELF Section Header Info
+ unsigned getHdrSize() const { return is64Bit ? 64 : 52; }
+ unsigned getSHdrSize() const { return is64Bit ? 64 : 40; }
+
+ /// Symbol Table Info
+ unsigned getSymTabEntrySize() const { return is64Bit ? 24 : 16; }
+
+ /// getPrefELFAlignment - Returns the preferred alignment for ELF. This
+ /// is used to align some sections.
+ unsigned getPrefELFAlignment() const { return is64Bit ? 8 : 4; }
+
+ /// getRelocationEntrySize - Entry size used in the relocation section
+ unsigned getRelocationEntrySize() const {
+ return is64Bit ? (hasRelocationAddend() ? 24 : 16)
+ : (hasRelocationAddend() ? 12 : 8);
+ }
+
+ /// getRelocationType - Returns the target specific ELF Relocation type.
+ /// 'MachineRelTy' contains the object code independent relocation type
+ virtual unsigned getRelocationType(unsigned MachineRelTy) const = 0;
+
+ /// hasRelocationAddend - True if the target uses an addend in the
+ /// ELF relocation entry.
+ virtual bool hasRelocationAddend() const = 0;
+
+ /// getDefaultAddendForRelTy - Gets the default addend value for a
+ /// relocation entry based on the target ELF relocation type.
+ virtual long int getDefaultAddendForRelTy(unsigned RelTy,
+ long int Modifier = 0) const = 0;
+
+ /// getRelTySize - Returns the size of relocatable field in bits
+ virtual unsigned getRelocationTySize(unsigned RelTy) const = 0;
+
+ /// isPCRelativeRel - True if the relocation type is pc relative
+ virtual bool isPCRelativeRel(unsigned RelTy) const = 0;
+
+ /// getJumpTableRelocationTy - Returns the machine relocation type used
+ /// to reference a jumptable.
+ virtual unsigned getAbsoluteLabelMachineRelTy() const = 0;
+
+ /// computeRelocation - Some relocatable fields could be relocated
+ /// directly, avoiding the relocation symbol emission, compute the
+ /// final relocation value for this symbol.
+ virtual long int computeRelocation(unsigned SymOffset, unsigned RelOffset,
+ unsigned RelTy) const = 0;
};
} // end llvm namespace