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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [lto/] [lto-macho.h] - Blame information for rev 455

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1 288 jeremybenn
/* LTO routines for Mach-O object files.
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   Copyright 2010 Free Software Foundation, Inc.
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   Contributed by Steven Bosscher.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3.  If not see
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<http://www.gnu.org/licenses/>.  */
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#ifndef LTO_MACH_O_H
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#define LTO_MACH_O_H
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/* On-disk file structures.  */
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/* Mach-O header (32 bits version).  */
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struct mach_o_header_32
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{
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  unsigned char magic[4];       /* Magic number.  */
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  unsigned char cputype[4];     /* CPU that this object is for.  */
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  unsigned char cpusubtype[4];  /* CPU subtype.  */
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  unsigned char filetype[4];    /* Type of file.  */
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  unsigned char ncmds[4];       /* Number of load commands.  */
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  unsigned char sizeofcmds[4];  /* Total size of load commands.  */
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  unsigned char flags[4];       /* Flags for special featues.  */
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};
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typedef struct mach_o_header_32 mach_o_header_32;
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/* Mach-O header (64 bits version).  */
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struct mach_o_header_64
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{
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  unsigned char magic[4];       /* Magic number.  */
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  unsigned char cputype[4];     /* CPU that this object is for.  */
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  unsigned char cpusubtype[4];  /* CPU subtype.  */
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  unsigned char filetype[4];    /* Type of file.  */
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  unsigned char ncmds[4];       /* Number of load commands.  */
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  unsigned char sizeofcmds[4];  /* Total size of load commands.  */
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  unsigned char flags[4];       /* Flags for special featues.  */
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  unsigned char reserved[4];    /* Reserved.  Duh.  */
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};
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typedef struct mach_o_header_64 mach_o_header_64;
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/* Magic number.  */
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#define MACH_O_MH_MAGIC                 0xfeedface
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#define MACH_O_MH_CIGAM                 0xcefaedfe
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#define MACH_O_MH_MAGIC_64              0xfeedfacf
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#define MACH_O_MH_CIGAM_64              0xcffaedfe
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/* Supported CPU types.  */
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#define MACH_O_CPU_TYPE_I386            7
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#define MACH_O_CPU_TYPE_X86_64          7 + 0x1000000
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#define MACH_O_CPU_TYPE_POWERPC         18
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#define MACH_O_CPU_TYPE_POWERPC_64      18 + 0x1000000
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/* Supported file types.  */
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#define MACH_O_MH_OBJECT                0x01
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/* Mach-O load command data structure.  */
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struct mach_o_load_command
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{
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  unsigned char cmd[4];         /* The type of load command.  */
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  unsigned char cmdsize[4];     /* Size in bytes of load command data structure.  */
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};
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typedef struct mach_o_load_command mach_o_load_command;
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/* Supported load commands.  We support only the segment load commands.  */
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#define MACH_O_LC_SEGMENT               0x01
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#define MACH_O_LC_SEGMENT_64            0x19
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/* LC_SEGMENT load command.  */
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struct mach_o_segment_command_32
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{
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  unsigned char cmd[4];         /* The type of load command (LC_SEGMENT).  */
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  unsigned char cmdsize[4];     /* Size in bytes of load command data structure.  */
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  unsigned char segname[16];    /* Name of this segment.  */
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  unsigned char vmaddr[4];      /* Virtual memory address of this segment.  */
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  unsigned char vmsize[4];      /* Size there, in bytes.  */
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  unsigned char fileoff[4];     /* Offset in bytes of the data to be mapped.  */
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  unsigned char filesize[4];    /* Size in bytes on disk.  */
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  unsigned char maxprot[4];     /* Maximum permitted vmem protection.  */
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  unsigned char initprot[4];    /* Initial vmem protection.  */
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  unsigned char nsects[4];      /* Number of sections in this segment.  */
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  unsigned char flags[4];       /* Flags that affect the loading.  */
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};
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typedef struct mach_o_segment_command_32 mach_o_segment_command_32;
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/* LC_SEGMENT_64 load command.  Only nsects matters for us, really.  */
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struct mach_o_segment_command_64
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{
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  unsigned char cmd[4];         /* The type of load command (LC_SEGMENT_64).  */
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  unsigned char cmdsize[4];     /* Size in bytes of load command data structure.  */
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  unsigned char segname[16];    /* Name of this segment.  */
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  unsigned char vmaddr[8];      /* Virtual memory address of this segment.  */
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  unsigned char vmsize[8];      /* Size there, in bytes.  */
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  unsigned char fileoff[8];     /* Offset in bytes of the data to be mapped.  */
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  unsigned char filesize[8];    /* Size in bytes on disk.  */
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  unsigned char maxprot[4];     /* Maximum permitted vmem protection.  */
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  unsigned char initprot[4];    /* Initial vmem protection.  */
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  unsigned char nsects[4];      /* Number of sections in this segment.  */
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  unsigned char flags[4];       /* Flags that affect the loading.  */
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};
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typedef struct mach_o_segment_command_64 mach_o_segment_command_64;
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/* A Mach-O 32-bits section.  */
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struct mach_o_section_32
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{
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  unsigned char sectname[16];   /* Section name.  */
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  unsigned char segname[16];    /* Segment that the section belongs to.  */
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  unsigned char addr[4];        /* Address of this section in memory.  */
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  unsigned char size[4];        /* Size in bytes of this section.  */
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  unsigned char offset[4];      /* File offset of this section.  */
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  unsigned char align[4];       /* log2 of this section's alignment.  */
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  unsigned char reloff[4];      /* File offset of this section's relocs.  */
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  unsigned char nreloc[4];      /* Number of relocs for this section.  */
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  unsigned char flags[4];       /* Section flags/attributes.  */
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  unsigned char reserved1[4];
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  unsigned char reserved2[4];
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};
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typedef struct mach_o_section_32 mach_o_section_32;
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/* A Mach-O 64-bits section.  */
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struct mach_o_section_64
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{
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  unsigned char sectname[16];   /* Section name.  */
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  unsigned char segname[16];    /* Segment that the section belongs to.  */
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  unsigned char addr[8];        /* Address of this section in memory.  */
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  unsigned char size[8];        /* Size in bytes of this section.  */
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  unsigned char offset[4];      /* File offset of this section.  */
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  unsigned char align[4];       /* log2 of this section's alignment.  */
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  unsigned char reloff[4];      /* File offset of this section's relocs.  */
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  unsigned char nreloc[4];      /* Number of relocs for this section.  */
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  unsigned char flags[4];       /* Section flags/attributes.  */
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  unsigned char reserved1[4];
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  unsigned char reserved2[4];
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  unsigned char reserved3[4];
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};
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typedef struct mach_o_section_64 mach_o_section_64;
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/* Flags for Mach-O sections.  LTO sections are marked with S_ATTR_DEBUG
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   to instruct the linker to ignore the sections.  */
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#define MACH_O_S_ATTR_DEBUG                     0x02000000
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/* In-memory file structures.  */
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/* Section data in output files is made of these.  */
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struct lto_mach_o_data_d
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{
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  /* Pointer to data block.  */
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  void *d_buf;
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  /* Size of data block.  */
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  ssize_t d_size;
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  /* Next data block for this section.  */
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  struct lto_mach_o_data_d *next;
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};
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typedef struct lto_mach_o_data_d *lto_mach_o_data;
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/* This struct tracks the data for a section.  */
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struct lto_mach_o_section_d
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{
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  /* Singly-linked list of section's data blocks.  */
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  lto_mach_o_data data_chain;
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  /* Offset in string table of the section name.  */
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  size_t strtab_offs;
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  /* Section name.  */
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  const char *name;
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  /* Number of trailing padding bytes needed.  */
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  ssize_t pad_needed;
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  /* Raw section header data.  */
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  size_t section_size;
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  union {
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    struct {
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      char sectname[16];
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      char segname[16];
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    } section;
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    mach_o_section_32 section_32;
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    mach_o_section_64 section_64;
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  } u;
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  /* Next section for this file.  */
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  struct lto_mach_o_section_d *next;
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};
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typedef struct lto_mach_o_section_d *lto_mach_o_section;
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DEF_VEC_P (lto_mach_o_section);
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DEF_VEC_ALLOC_P (lto_mach_o_section, heap);
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/* A Mach-O file.  */
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struct lto_mach_o_file_d
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{
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  /* The base information.  */
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  lto_file base;
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  /* Common file members:  */
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  /* The system file descriptor for the file.  */
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  int fd;
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  /* The file's overall header.  */
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  union {
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    /* We make use here of the fact that section_32 and section_64
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       have the same layout (except for section_64.reserved3).  We
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       read the struct of proper size, but only address the first
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       member of this union.  */
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    mach_o_header_64 header;
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    mach_o_header_32 header_32;
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    mach_o_header_64 header_64;
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  } u;
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  /* All sections in a varray.  */
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  VEC(lto_mach_o_section, heap) *section_vec;
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  /* Readable file members:  */
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  /* File total size.  */
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  off_t file_size;
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  /* True if this file is open for writing.  */
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  bool writable;
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  /* Section containing the __section_names section.  */
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  lto_mach_o_section section_names_section;
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  /* Writable file members:  */
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  /* The currently active section.  */
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  lto_mach_o_section scn;
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  /* Linked list of data which must be freed *after* the file has been
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     closed.  This is an annoying limitation of libelf.  Which has been
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     faithfully reproduced here.  */
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  struct lto_char_ptr_base *data;
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};
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typedef struct lto_mach_o_file_d lto_mach_o_file;
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#endif /* LTO_MACH_O_H */
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