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diff --git a/src/vm/gdbjit.h b/src/vm/gdbjit.h
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+//*****************************************************************************
+// File: gdbjit.h
+//
+
+//
+// Header file for GDB JIT interface implemenation.
+//
+//*****************************************************************************
+
+
+#ifndef __GDBJIT_H__
+#define __GDBJIT_H__
+
+#include <stdint.h>
+#include "method.hpp"
+#include "../inc/llvm/ELF.h"
+#include "../inc/llvm/Dwarf.h"
+
+#if defined(_TARGET_X86_) || defined(_TARGET_ARM_)
+ typedef Elf32_Ehdr Elf_Ehdr;
+ typedef Elf32_Shdr Elf_Shdr;
+#define ADDRESS_SIZE 4
+#elif defined(_TARGET_AMD64_) || defined(_TARGET_ARM64_)
+ typedef Elf64_Ehdr Elf_Ehdr;
+ typedef Elf64_Shdr Elf_Shdr;
+#define ADDRESS_SIZE 8
+#else
+#error "Target is not supported"
+#endif
+
+struct __attribute__((packed)) DwarfCompUnit
+{
+ uint32_t m_length;
+ uint16_t m_version;
+ uint32_t m_abbrev_offset;
+ uint8_t m_addr_size;
+};
+
+struct __attribute__((packed)) DwarfPubHeader
+{
+ uint32_t m_length;
+ uint16_t m_version;
+ uint32_t m_debug_info_off;
+ uint32_t m_debug_info_len;
+};
+
+#define DW_LNS_MAX DW_LNS_set_isa
+
+struct __attribute__((packed)) DwarfLineNumHeader
+{
+ uint32_t m_length;
+ uint16_t m_version;
+ uint32_t m_hdr_length;
+ uint8_t m_min_instr_len;
+ uint8_t m_def_is_stmt;
+ int8_t m_line_base;
+ uint8_t m_line_range;
+ uint8_t m_opcode_base;
+ uint8_t m_std_num_arg[DW_LNS_MAX];
+};
+
+struct SymbolsInfo
+{
+ int lineNumber, ilOffset, nativeOffset, fileIndex;
+ char fileName[2*MAX_PATH_FNAME];
+};
+
+
+class NotifyGdb
+{
+public:
+ static void MethodCompiled(MethodDesc* MethodDescPtr);
+ static void MethodDropped(MethodDesc* MethodDescPtr);
+private:
+ struct MemBuf
+ {
+ NewArrayHolder<char> MemPtr;
+ unsigned MemSize;
+ MemBuf() : MemPtr(0), MemSize(0)
+ {}
+ };
+
+ static bool BuildELFHeader(MemBuf& buf);
+ static bool BuildSectionNameTable(MemBuf& buf);
+ static bool BuildSectionTable(MemBuf& buf);
+ static bool BuildDebugStrings(MemBuf& buf);
+ static bool BuildDebugAbbrev(MemBuf& buf);
+ static bool BuildDebugInfo(MemBuf& buf);
+ static bool BuildDebugPub(MemBuf& buf, const char* name, uint32_t size, uint32_t dieOffset);
+ static bool BuildLineTable(MemBuf& buf, PCODE startAddr, SymbolsInfo* lines, unsigned nlines);
+ static bool BuildFileTable(MemBuf& buf, SymbolsInfo* lines, unsigned nlines);
+ static bool BuildLineProg(MemBuf& buf, PCODE startAddr, SymbolsInfo* lines, unsigned nlines);
+ static bool FitIntoSpecialOpcode(int8_t line_shift, uint8_t addr_shift);
+ static void IssueSetAddress(char*& ptr, PCODE addr);
+ static void IssueEndOfSequence(char*& ptr);
+ static void IssueSimpleCommand(char*& ptr, uint8_t command);
+ static void IssueParamCommand(char*& ptr, uint8_t command, char* param, int param_len);
+ static void IssueSpecialCommand(char*& ptr, int8_t line_shift, uint8_t addr_shift);
+ static void SplitPathname(const char* path, const char*& pathName, const char*& fileName);
+ static int Leb128Encode(uint32_t num, char* buf, int size);
+ static int Leb128Encode(int32_t num, char* buf, int size);
+};
+
+#endif // #ifndef __GDBJIT_H__