#include "config.h"#include "system.h"#include "coretypes.h"#include "tm.h"#include "filenames.h"#include "file-find.h"#include "collect2.h"#include "collect2-aix.h"#include "diagnostic.h"#include "demangle.h"#include "obstack.h"#include "intl.h"#include "version.h"
Data Structures | |
| struct | id |
| struct | head |
| struct | lto_object |
| struct | lto_object_list |
Macros | |
| #define | TARGET_64BIT TARGET_64BIT_DEFAULT |
| #define | LIBRARY_PATH_ENV "LIBRARY_PATH" |
| #define | COLLECT |
| #define | OBJECT_FORMAT_NONE |
| #define | NM_FLAGS "-n" |
| #define | NAME__MAIN "__main" |
| #define | DEFAULT_INIT_PRIORITY 65535 |
| #define | COLLECT_SHARED_INIT_FUNC(STREAM, FUNC) fprintf ((STREAM), "void _GLOBAL__DI() {\n\t%s();\n}\n", (FUNC)) |
| #define | COLLECT_SHARED_FINI_FUNC(STREAM, FUNC) fprintf ((STREAM), "void _GLOBAL__DD() {\n\t%s();\n}\n", (FUNC)) |
| #define | SHLIB_SUFFIX ".so" |
| #define | DO_COLLECT_EXPORT_LIST 0 |
Typedefs | |
| typedef int | scanfilter |
Enumerations | |
| enum | lto_mode_d { LTO_MODE_NONE, LTO_MODE_LTO, LTO_MODE_WHOPR, LTO_MODE_NONE, LTO_MODE_LTO, LTO_MODE_WHOPR } |
| enum | symkind { SYM_REGULAR = 0, SYM_CTOR = 1, SYM_DTOR = 2, SYM_INIT = 3, SYM_FINI = 4, SYM_DWEH = 5 } |
| enum | scanpass { PASS_FIRST, PASS_OBJ, PASS_LIB, PASS_SECOND, PASS_LTOINFO } |
| enum | scanfilter_masks { SCAN_NOTHING = 0, SCAN_CTOR = 1 << SYM_CTOR, SCAN_DTOR = 1 << SYM_DTOR, SCAN_INIT = 1 << SYM_INIT, SCAN_FINI = 1 << SYM_FINI, SCAN_DWEH = 1 << SYM_DWEH, SCAN_ALL = ~0 } |
Functions | |
| static symkind | is_ctor_dtor (const char *) |
| static void | handler (int) |
| static void | do_wait (const char *, struct pex_obj *) |
| static void | fork_execute (const char *, char **) |
| static void | maybe_unlink (const char *) |
| static void | maybe_unlink_list (char **) |
| static void | add_to_list (struct head *, const char *) |
| static int | extract_init_priority (const char *) |
| static void | sort_ids (struct head *) |
| static void | write_list (FILE *, const char *, struct id *) |
| static void | write_list_with_asm (FILE *, const char *, struct id *) |
| static void | write_c_file (FILE *, const char *) |
| static void | write_c_file_stat (FILE *, const char *) |
| static void | write_c_file_glob (FILE *, const char *) |
| static char * | extract_string (const char **) |
| static void | post_ld_pass (bool) |
| static void | process_args (int *argcp, char **argv) |
| static void | scan_prog_file (const char *, scanpass, scanfilter) |
| static void | collect_atexit () |
| void | notice () |
| void | notice_translated () |
| static void | handler () |
| int | file_exists () |
| static char * | extract_string () |
| void | dump_ld_file () |
| static symkind | is_ctor_dtor () |
| static void | add_lto_object () |
| static void | maybe_run_lto_and_relink (char **lto_ld_argv, char **object_lst, const char **object, bool force) |
| int | main () |
| int | collect_wait () |
| static void | do_wait () |
| static void | fork_execute () |
| static void | maybe_unlink () |
| static void | maybe_unlink_list () |
| static void | add_to_list () |
| static int | extract_init_priority () |
| static void | sort_ids () |
| static void | write_list () |
| static void | write_list_with_asm () |
| static void | write_c_file_stat () |
| static void | write_c_file_glob () |
| static void | write_c_file () |
| static bool | maybe_lto_object_file () |
Variables | |
| int | do_collecting = 0 |
| int | no_demangle |
| bool | vflag |
| static int | rflag |
| static int | strip_flag |
| static enum lto_mode_d | lto_mode = LTO_MODE_NONE |
| bool | debug |
| bool | helpflag |
| static int | shared_obj |
| static const char * | c_file |
| static const char * | o_file |
| static char ** | lto_o_files |
| const char * | ldout |
| const char * | lderrout |
| static const char * | output_file |
| static const char * | nm_file_name |
| static const char * | strip_file_name |
| const char * | c_file_name |
| static char * | initname |
| static char * | fininame |
| static struct head | constructors |
| static struct head | destructors |
| static struct head | frame_tables |
| static bool | at_file_supplied |
| static char * | response_file |
| struct obstack | temporary_obstack |
| char * | temporary_firstobj |
| static const char * | target_system_root = "" |
| bool | may_unlink_output_file = false |
| static struct lto_object_list | lto_objects |
| static struct path_prefix cpath | path |
| static long | sequence_number = 0 |
Macro Definition Documentation
| #define COLLECT |
| #define COLLECT_SHARED_FINI_FUNC | ( | STREAM, | |
| FUNC | |||
| ) | fprintf ((STREAM), "void _GLOBAL__DD() {\n\t%s();\n}\n", (FUNC)) |
| #define COLLECT_SHARED_INIT_FUNC | ( | STREAM, | |
| FUNC | |||
| ) | fprintf ((STREAM), "void _GLOBAL__DI() {\n\t%s();\n}\n", (FUNC)) |
| #define DEFAULT_INIT_PRIORITY 65535 |
This must match tree.h.
Referenced by output_section_asm_op().
| #define DO_COLLECT_EXPORT_LIST 0 |
Cook up an always defined indication of whether we proceed the "EXPORT_LIST" way.
| #define LIBRARY_PATH_ENV "LIBRARY_PATH" |
| #define NAME__MAIN "__main" |
Some systems use main in a way incompatible with its use in gcc, in these cases use the macros NAMEMAIN to give a quoted symbol and SYMBOL__MAIN to give the same symbol without quotes for an alternative entry point.
| #define NM_FLAGS "-n" |
Default flags to pass to nm.
| #define OBJECT_FORMAT_NONE |
On certain systems, we have code that works by scanning the object file directly. But this code uses system-specific header files and library functions, so turn it off in a cross-compiler. Likewise, the names of the utilities are not correct for a cross-compiler; we have to hope that cross-versions are in the proper directories. If we cannot use a special method, use the ordinary one: run nm to find what symbols are present. In a cross-compiler, this means you need a cross nm, but that is not quite as unpleasant as special headers.
| #define SHLIB_SUFFIX ".so" |
| #define TARGET_64BIT TARGET_64BIT_DEFAULT |
Collect static initialization info into data structures that can be traversed by C++ initialization and finalization routines. Copyright (C) 1992-2013 Free Software Foundation, Inc. Contributed by Chris Smith (csmith@convex.com). Heavily modified by Michael Meissner (meissner@cygnus.com), Per Bothner (bothner@cygnus.com), and John Gilmore (gnu@cygnus.com).
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/. Build tables of static constructors and destructors and run ld. TARGET_64BIT may be defined to use driver specific functionality.
Typedef Documentation
| typedef int scanfilter |
This type is used for parameters and variables which hold combinations of the flags in enum scanfilter_masks.
Enumeration Type Documentation
| enum lto_mode_d |
| enum scanfilter_masks |
| enum scanpass |
| enum symkind |
Function Documentation
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Search for NAME using prefix list PPREFIX. We only look for executable files.
Return 0 if not found, otherwise return its name, allocated with malloc. Add an entry for the object file NAME to object file list LIST. New entries are added at the end of the list. The original pointer value of NAME is preserved, i.e., no string copy is performed.
References CONST_CAST2, lto_object_list::first, lto_objects, PASS_LTOINFO, SCAN_ALL, and scan_prog_file().
Referenced by maybe_lto_object_file().
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Referenced by scan_prog_file().
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Delete tempfiles and exit function.
| int collect_wait | ( | ) |
Wait for a process to finish, and exit if a nonzero status is found.
References errno.
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| void dump_ld_file | ( | ) |
Make sure we output at least one space, or the demangled symbol name will run into whatever text follows.
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Grab the init priority number from an init function name that looks like "_GLOBAL_.I.12345.foo".
Extract init_p number from ctor/dtor name.
References frame_tables, head::number, and output_file.
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Parse a reasonable subset of shell quoting syntax.
| int file_exists | ( | ) |
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Return the kind of symbol denoted by name S.
| int main | ( | ) |
Main program.
The kinds of symbols we will have to consider when scanning the outcome of a first pass link. This is ALL to start with, then might be adjusted before getting to the first pass link per se, typically on AIX where we perform an early scan of objects and libraries to fetch the list of global ctors/dtors and make sure they are not garbage collected.
Suppress demangling by the real linker, which may be broken.
Unlock the stdio streams.
Do not invoke xcalloc before this point, since locale needs to be set first, in case a diagnostic is issued.
Parse command line early for instances of -debug. This allows the debug flag to be set before functions like find_a_file() are called. We also look for the -flto or -flto-partition=none flag to know what LTO mode we are in.
-fno-profile-arcs -fno-test-coverage -fno-branch-probabilities -fno-exceptions -w -fno-whole-program
Extract COMPILER_PATH and PATH into our prefix list.
Try to discover a valid linker/nm/strip to use.
Maybe we know the right file to use (if not cross).
Search the (target-specific) compiler dirs for ld'.
Likewise for `collect-ld'.
Search the compiler directories for `ld'. We have protection against recursive calls in find_a_file.
Search the ordinary system bin directories for `ld' (if native linking) or `TARGET-ld' (if cross).
Determine the full path name of the C compiler to use.
Here it should be safe to use the system search path since we should have already qualified the name of the compiler when it is needed.
Make temp file names.
Get any options that the upper GCC wants to pass to the sub-GCC. AIX support needs to know if -shared has been specified before parsing commandline arguments.
!!! When GCC calls collect2, it does not know whether it is calling collect2 or ld. So collect2 cannot meaningfully understand any options except those ld understands. If you propose to make GCC pass some other option, just imagine what will happen if ld is really ld!!!
Parse arguments. Remember output file spec, pass the rest to ld.
After the first file, put in the c++ rt0.
Already parsed.
Do not pass -fuse-ld={bfd|gold} to the linker. place o_file BEFORE this argument!
We must strip after the nm run, otherwise C++ linking
will not work. Thus we strip in the second ld run, or
else with strip if there is no second ld run. place o_file BEFORE this argument!
Load the program, searching all libraries and attempting to provide undefined symbols from repository information. If -r or they will be run via some other method, do not build the constructor or destructor list, just return now.
Perform the first pass link now, if we're about to exit or if we need to scan for things we haven't collected yet before pursuing further. On AIX, the latter typically includes nothing for shared objects or frame tables for an executable, out of what the required early scan on objects and libraries has performed above. In the !shared_obj case, we expect the relevant tables to be dragged together with their associated functions from precise cross reference insertions by the compiler.
Unless we have done it all already, examine the namelist and search for static constructors and destructors to call. Write the constructor and destructor tables to a .s file and reload.
If the scan exposed nothing of special interest, there's no need to generate the glue code and relink so return now.
Do tlink without additional code generation now if we didn't
do it earlier for scanning purposes. Strip now if it was requested on the command line.
Sort ctor and dtor lists by priority.
Tell the linker that we have initializer and finalizer functions.
End of arguments to second link phase.
Assemble the constructor and destructor tables. Link the tables in with the rest of the program.
Otherwise, simply call ld because tlink is already done.
Let scan_prog_file do any final mods (OSF/rose needs this for constructors/destructors in shared libraries.
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Check to make sure the file is an LTO object file.
References add_lto_object(), and lto_objects.
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Perform a link-time recompilation and relink if any of the object files contain LTO info. The linker command line LTO_LD_ARGV represents the linker command that would produce a final executable without the use of LTO. OBJECT_LST is a vector of object file names appearing in LTO_LD_ARGV that are to be considered for link-time recompilation, where OBJECT is a pointer to the last valid element. (This awkward convention avoids an impedance mismatch with the usage of similarly-named variables in main().) The elements of OBJECT_LST must be identical, i.e., pointer equal, to the corresponding arguments in LTO_LD_ARGV.
Upon entry, at least one linker run has been performed without the use of any LTO info that might be present. Any recompilations necessary for template instantiations have been performed, and initializer/finalizer tables have been created if needed and included in the linker command line LTO_LD_ARGV. If any of the object files contain LTO info, we run the LTO back end on all such files, and perform the final link with the LTO back end output substituted for the LTO-optimized files. In some cases, a final link with all link-time generated code has already been performed, so there is no need to relink if no LTO info is found. In other cases, our caller has not produced the final executable, and is relying on us to perform the required link whether LTO info is present or not. In that case, the FORCE argument should be true. Note that the linker command line argument LTO_LD_ARGV passed into this function may be modified in place.
If file contains LTO info, add it to the list of LTO objects.
Increment the argument count by the number of object file arguments we will add. An upper bound suffices, so just count all of the object files regardless of whether they contain LTO info.
There is at least one object file containing LTO info,
so we need to run the LTO back end and relink.
To do so we build updated ld arguments with first
LTO object replaced by all partitions and other LTO
objects removed. Add LTO objects to the wrapper command line.
Run the LTO back end.
Compute memory needed for new LD arguments. At most number of original arguemtns
plus number of partitions. After running the LTO back end, we will relink, substituting
the LTO output for the object files that we submitted to the
LTO. Here, we modify the linker command line for the relink. Copy all arguments until we find first LTO file.
Now insert all LTO partitions.
... and copy the rest.
Run the linker again, this time replacing the object files
optimized by the LTO with the temporary file generated by the LTO. Our caller is relying on us to do the link
even though there is no LTO back end work to be done.
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Unlink FILE unless we are debugging or this is the output_file and we may not unlink it.
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| void notice | ( | ) |
Notify user of a non-error.
| void notice_translated | ( | ) |
Notify user of a non-error, without translating the format string.
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Scan the name list of the loaded program for the symbols g++ uses for static constructors and destructors.
The SCANPASS argument tells which collect processing pass this is for and the SCANFILTER argument tells which kinds of symbols to consider in this pass. Symbols of a special kind not in the filter mask are considered as regular ones.
The constructor table begins at CTOR_LIST and contains a count of the number of pointers (or -1 if the constructors are built in a separate section by the linker), followed by the pointers to the constructor functions, terminated with a null pointer. The destructor table has the same format, and begins at DTOR_LIST.
Generic version to scan the name list of the loaded program for the symbols g++ uses for static constructors and destructors.
LTO objects must be in a known format. This check prevents us from accepting an archive containing LTO objects, which gcc cannot currently handle.
If we do not have an `nm', complain.
Trace if needed.
Read each line of nm output.
Look for the LTO info marker symbol, and add filename to
the LTO objects list if found. We need to read all the input, so we can't just
return here. But we can avoid useless work. If it contains a constructor or destructor name, add the name
to the appropriate list unless this is a kind of symbol we're
not supposed to even consider. Find the end of the symbol name.
Do not include `|', because Encore nm can tack that on the end.
References add_to_list(), constructors, destructors, fatal_error(), frame_tables, PASS_LIB, SCAN_CTOR, SCAN_DTOR, SCAN_DWEH, SCAN_FINI, SCAN_INIT, SYM_CTOR, SYM_DTOR, SYM_DWEH, SYM_FINI, and SYM_INIT.
Referenced by add_lto_object().
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Insertion sort the ids from ctor/dtor list HEAD_PTR in descending order. ctors will be run from right to left, dtors from left to right.
id holds the current element to insert. id_next holds the next element to insert. id_ptr iterates through the already sorted elements looking for the place to insert id.
We don't have any sorted elements yet.
If the sequence numbers are the same, we put the id from the
file later on the command line later in the list. Hack: do lexical compare, too.
|| (id->sequence == (*id_ptr)->sequence
&& strcmp (id->name, (*id_ptr)->name) > 0) Now set the sequence numbers properly so write_c_file works.
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Write the constructor/destructor tables.
Write the tables as C code.
This must match what's in frame.h.
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Write out the constructor and destructor tables statically (for a shared object), along with the functions to execute them.
Figure out name of output_file, stripping off .so version.
q points to null at end of the string (or . of the .so version)
Write the tables as C code.
This must match what's in frame.h.
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Write: `prefix', the names on list LIST, `suffix'.
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Added for debugging purpose.
Variable Documentation
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| const char* c_file_name |
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Referenced by scan_prog_file().
| DEBUG_FUNCTION void debug |
Unified dump function for a DATA_REFERENCE structure.
Generic dump for the above.
Print the slot this node is in, and its code, and address.
Referenced by debug(), find_a_file(), find_file_set_debug(), and prefix_from_string().
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Referenced by scan_prog_file().
| int do_collecting = 0 |
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Referenced by extract_init_priority(), and scan_prog_file().
| bool helpflag |
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| const char* lderrout |
| const char* ldout |
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Current LTO mode.
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Referenced by add_lto_object(), and maybe_lto_object_file().
Whether we may unlink the output file, which should be set as soon as we know we have successfully produced it. This is typically useful to prevent blindly attempting to unlink a read-only output that the target linker would leave untouched.
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| int no_demangle |
Nonzero if we should suppress the automatic demangling of identifiers in linker error messages. Set from COLLECT_NO_DEMANGLE.
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Referenced by extract_init_priority().
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We maintain two prefix lists: one from COMPILER_PATH environment variable and one from the PATH variable.
Referenced by create_block_for_threading(), and read_state_type().
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A string that must be prepended to a target OS path in order to find it on the host system.
| char* temporary_firstobj |
| struct obstack temporary_obstack |
Referenced by obstack_fgets(), and tlink_execute().
| bool vflag |
