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/* LTO routines for Mach-O object files.

   Copyright 2010 Free Software Foundation, Inc.

   Contributed by Steven Bosscher.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under

the terms of the GNU General Public License as published by the Free

Software Foundation; either version 3, or (at your option) any later

version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY

WARRANTY; without even the implied warranty of MERCHANTABILITY or

FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

for more details.

You should have received a copy of the GNU General Public License

along with GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

#ifndef LTO_MACH_O_H

#define LTO_MACH_O_H

/* On-disk file structures.  */

/* Mach-O header (32 bits version).  */

struct mach_o_header_32

{

  unsigned char magic[4];       /* Magic number.  */

  unsigned char cputype[4];     /* CPU that this object is for.  */

  unsigned char cpusubtype[4];  /* CPU subtype.  */

  unsigned char filetype[4];    /* Type of file.  */

  unsigned char ncmds[4];       /* Number of load commands.  */

  unsigned char sizeofcmds[4];  /* Total size of load commands.  */

  unsigned char flags[4];       /* Flags for special featues.  */

};

typedef struct mach_o_header_32 mach_o_header_32;

/* Mach-O header (64 bits version).  */

struct mach_o_header_64

{

  unsigned char magic[4];       /* Magic number.  */

  unsigned char cputype[4];     /* CPU that this object is for.  */

  unsigned char cpusubtype[4];  /* CPU subtype.  */

  unsigned char filetype[4];    /* Type of file.  */

  unsigned char ncmds[4];       /* Number of load commands.  */

  unsigned char sizeofcmds[4];  /* Total size of load commands.  */

  unsigned char flags[4];       /* Flags for special featues.  */

  unsigned char reserved[4];    /* Reserved.  Duh.  */

};

typedef struct mach_o_header_64 mach_o_header_64;

/* Magic number.  */

#define MACH_O_MH_MAGIC                 0xfeedface

#define MACH_O_MH_CIGAM                 0xcefaedfe

#define MACH_O_MH_MAGIC_64              0xfeedfacf

#define MACH_O_MH_CIGAM_64              0xcffaedfe

/* Supported CPU types.  */

#define MACH_O_CPU_TYPE_I386            7

#define MACH_O_CPU_TYPE_X86_64          7 + 0x1000000

#define MACH_O_CPU_TYPE_POWERPC         18

#define MACH_O_CPU_TYPE_POWERPC_64      18 + 0x1000000

/* Supported file types.  */

#define MACH_O_MH_OBJECT                0x01

/* Mach-O load command data structure.  */

struct mach_o_load_command

{

  unsigned char cmd[4];         /* The type of load command.  */

  unsigned char cmdsize[4];     /* Size in bytes of load command data structure.  */

};

typedef struct mach_o_load_command mach_o_load_command;

/* Supported load commands.  We support only the segment load commands.  */

#define MACH_O_LC_SEGMENT               0x01

#define MACH_O_LC_SEGMENT_64            0x19

/* LC_SEGMENT load command.  */

struct mach_o_segment_command_32

{

  unsigned char cmd[4];         /* The type of load command (LC_SEGMENT).  */

  unsigned char cmdsize[4];     /* Size in bytes of load command data structure.  */

  unsigned char segname[16];    /* Name of this segment.  */

  unsigned char vmaddr[4];      /* Virtual memory address of this segment.  */

  unsigned char vmsize[4];      /* Size there, in bytes.  */

  unsigned char fileoff[4];     /* Offset in bytes of the data to be mapped.  */

  unsigned char filesize[4];    /* Size in bytes on disk.  */

  unsigned char maxprot[4];     /* Maximum permitted vmem protection.  */

  unsigned char initprot[4];    /* Initial vmem protection.  */

  unsigned char nsects[4];      /* Number of sections in this segment.  */

  unsigned char flags[4];       /* Flags that affect the loading.  */

};

typedef struct mach_o_segment_command_32 mach_o_segment_command_32;

/* LC_SEGMENT_64 load command.  Only nsects matters for us, really.  */

struct mach_o_segment_command_64

{

  unsigned char cmd[4];         /* The type of load command (LC_SEGMENT_64).  */

  unsigned char cmdsize[4];     /* Size in bytes of load command data structure.  */

  unsigned char segname[16];    /* Name of this segment.  */

  unsigned char vmaddr[8];      /* Virtual memory address of this segment.  */

  unsigned char vmsize[8];      /* Size there, in bytes.  */

  unsigned char fileoff[8];     /* Offset in bytes of the data to be mapped.  */

  unsigned char filesize[8];    /* Size in bytes on disk.  */

  unsigned char maxprot[4];     /* Maximum permitted vmem protection.  */

  unsigned char initprot[4];    /* Initial vmem protection.  */

  unsigned char nsects[4];      /* Number of sections in this segment.  */

  unsigned char flags[4];       /* Flags that affect the loading.  */

};

typedef struct mach_o_segment_command_64 mach_o_segment_command_64;

/* A Mach-O 32-bits section.  */

struct mach_o_section_32

{

  unsigned char sectname[16];   /* Section name.  */

  unsigned char segname[16];    /* Segment that the section belongs to.  */

  unsigned char addr[4];        /* Address of this section in memory.  */

  unsigned char size[4];        /* Size in bytes of this section.  */

  unsigned char offset[4];      /* File offset of this section.  */

  unsigned char align[4];       /* log2 of this section's alignment.  */

  unsigned char reloff[4];      /* File offset of this section's relocs.  */

  unsigned char nreloc[4];      /* Number of relocs for this section.  */

  unsigned char flags[4];       /* Section flags/attributes.  */

  unsigned char reserved1[4];

  unsigned char reserved2[4];

};

typedef struct mach_o_section_32 mach_o_section_32;

/* A Mach-O 64-bits section.  */

struct mach_o_section_64

{

  unsigned char sectname[16];   /* Section name.  */

  unsigned char segname[16];    /* Segment that the section belongs to.  */

  unsigned char addr[8];        /* Address of this section in memory.  */

  unsigned char size[8];        /* Size in bytes of this section.  */

  unsigned char offset[4];      /* File offset of this section.  */

  unsigned char align[4];       /* log2 of this section's alignment.  */

  unsigned char reloff[4];      /* File offset of this section's relocs.  */

  unsigned char nreloc[4];      /* Number of relocs for this section.  */

  unsigned char flags[4];       /* Section flags/attributes.  */

  unsigned char reserved1[4];

  unsigned char reserved2[4];

  unsigned char reserved3[4];

};

typedef struct mach_o_section_64 mach_o_section_64;

/* Flags for Mach-O sections.  LTO sections are marked with S_ATTR_DEBUG

   to instruct the linker to ignore the sections.  */

#define MACH_O_S_ATTR_DEBUG                     0x02000000

/* In-memory file structures.  */

/* Section data in output files is made of these.  */

struct lto_mach_o_data_d

{

  /* Pointer to data block.  */

  void *d_buf;

  /* Size of data block.  */

  ssize_t d_size;

  /* Next data block for this section.  */

  struct lto_mach_o_data_d *next;

};

typedef struct lto_mach_o_data_d *lto_mach_o_data;

/* This struct tracks the data for a section.  */

struct lto_mach_o_section_d

{

  /* Singly-linked list of section's data blocks.  */

  lto_mach_o_data data_chain;

  /* Offset in string table of the section name.  */

  size_t strtab_offs;

  /* Section name.  */

  const char *name;

  /* Number of trailing padding bytes needed.  */

  ssize_t pad_needed;

  /* Raw section header data.  */

  size_t section_size;

  union {

    struct {

      char sectname[16];

      char segname[16];

    } section;

    mach_o_section_32 section_32;

    mach_o_section_64 section_64;

  } u;

  /* Next section for this file.  */

  struct lto_mach_o_section_d *next;

};

typedef struct lto_mach_o_section_d *lto_mach_o_section;

DEF_VEC_P (lto_mach_o_section);

DEF_VEC_ALLOC_P (lto_mach_o_section, heap);

/* A Mach-O file.  */

struct lto_mach_o_file_d

{

  /* The base information.  */

  lto_file base;

  /* Common file members:  */

  /* The system file descriptor for the file.  */

  int fd;

  /* The file's overall header.  */

  union {

    /* We make use here of the fact that section_32 and section_64

       have the same layout (except for section_64.reserved3).  We

       read the struct of proper size, but only address the first

       member of this union.  */

    mach_o_header_64 header;

    mach_o_header_32 header_32;

    mach_o_header_64 header_64;

  } u;

  /* All sections in a varray.  */

  VEC(lto_mach_o_section, heap) *section_vec;

  /* Readable file members:  */

  /* File total size.  */

  off_t file_size;

  /* True if this file is open for writing.  */

  bool writable;

  /* Section containing the __section_names section.  */

  lto_mach_o_section section_names_section;

  /* Writable file members:  */

  /* The currently active section.  */

  lto_mach_o_section scn;

  /* Linked list of data which must be freed *after* the file has been

     closed.  This is an annoying limitation of libelf.  Which has been

     faithfully reproduced here.  */

  struct lto_char_ptr_base *data;

};

typedef struct lto_mach_o_file_d lto_mach_o_file;

#endif /* LTO_MACH_O_H */