From: Nick Alcock Date: Thu, 4 Jun 2020 18:28:52 +0000 (+0100) Subject: libctf, link: add lazy linking: clean up input members: err/warn cleanup X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=8d2229ad1e779fbdecfe1d68c02706d075eb81c6;p=binutils-gdb.git libctf, link: add lazy linking: clean up input members: err/warn cleanup This rather large and intertwined pile of changes does three things: First, it transitions from dprintf to ctf_err_warn for things the user might care about: this one file is the major impetus for the ctf_err_warn infrastructure, because things like file names are crucial in linker error messages, and errno values are utterly incapable of communicating them Second, it stabilizes the ctf_link APIs: you can now call ctf_link_add_ctf without a CTF argument (only a NAME), to lazily ctf_open the file with the given NAME when needed, and close it as soon as possible, to save memory. This is not an API change because a null CTF argument was prohibited before now. Since getting CTF directly from files uses ctf_open, passing in only a NAME requires use of libctf, not libctf-nobfd. The linker's behaviour is unchanged, as it still passes in a ctf_archive_t as before. This also let us fix a leak: we were opening ctf_archives and their containing ctf_files, then only closing the files and leaving the archives open. Third, this commit restructures the ctf_link_in_member argument used by the CTF linking machinery and adjusts its users accordingly. We drop two members: - arcname, which is difficult to construct and then only used in error messages (that were only dprintf()ed, so never seen!) - share_mode, since we store the flags passed to ctf_link (including the share mode) in a new ctf_file_t.ctf_link_flags to help dedup get hold of it We rename others whose existing names were fairly dreadful: - done_main_member -> done_parent, using consistent terminology for .ctf as the parent of all archive members - main_input_fp -> in_fp_parent, likewise - file_name -> in_file_name, likewise We add one new member, cu_mapped. Finally, we move the various frees of things like mapping table data to the top-level ctf_link, since deduplicating links will want to do that too. include/ * ctf-api.h (ECTF_NEEDSBFD): New. (ECTF_NERR): Adjust. (ctf_link): Rename share_mode arg to flags. libctf/ * Makefile.am: Set -DNOBFD=1 in libctf-nobfd, and =0 elsewhere. * Makefile.in: Regenerated. * ctf-impl.h (ctf_link_input_name): New. (ctf_file_t) : New. * ctf-create.c (ctf_serialize): Adjust accordingly. * ctf-link.c: Define ctf_open as weak when PIC. (ctf_arc_close_thunk): Remove unnecessary thunk. (ctf_file_close_thunk): Likewise. (ctf_link_input_name): New. (ctf_link_input_t): New value of the ctf_file_t.ctf_link_input. (ctf_link_input_close): Adjust accordingly. (ctf_link_add_ctf_internal): New, split from... (ctf_link_add_ctf): ... here. Return error if lazy loading of CTF is not possible. Change to just call... (ctf_link_add): ... this new function. (ctf_link_add_cu_mapping): Transition to ctf_err_warn. Drop the ctf_file_close_thunk. (ctf_link_in_member_cb_arg_t) Rename to... : ... this. : Drop. : Likewise (migrated to ctf_link_flags). : Rename to... : ... this. : Rename to... : ... this. : New. (ctf_link_one_type): Adjuwt accordingly. Transition to ctf_err_warn, removing a TODO. (ctf_link_one_variable): Note a case too common to warn about. Report in the debug stream if a cu-mapped link prevents addition of a conflicting variable. (ctf_link_one_input_archive_member): Adjust. (ctf_link_lazy_open): New, open a CTF archive for linking when needed. (ctf_link_close_one_input_archive): New, close it again. (ctf_link_one_input_archive): Adjust for lazy opening, member renames, and ctf_err_warn transition. Move the empty_link_type_mapping call to... (ctf_link): ... here. Adjut for renamings and thunk removal. Don't spuriously fail if some input contains no CTF data. (ctf_link_write): ctf_err_warn transition. * libctf.ver: Remove not-yet-stable comment. --- diff --git a/include/ChangeLog b/include/ChangeLog index d76ac8fbffc..6358ec6c78f 100644 --- a/include/ChangeLog +++ b/include/ChangeLog @@ -1,3 +1,9 @@ +2020-07-22 Nick Alcock + + * ctf-api.h (ECTF_NEEDSBFD): New. + (ECTF_NERR): Adjust. + (ctf_link): Rename share_mode arg to flags. + 2020-07-22 Nick Alcock * ctf-api.h (ECTF_INTERNAL): Adjust error text. diff --git a/include/ctf-api.h b/include/ctf-api.h index e061b7022b6..7d3e1c8bfcd 100644 --- a/include/ctf-api.h +++ b/include/ctf-api.h @@ -208,10 +208,11 @@ enum ECTF_NEXT_END, /* End of iteration. */ ECTF_NEXT_WRONGFUN, /* Wrong iteration function called. */ ECTF_NEXT_WRONGFP, /* Iteration entity changed in mid-iterate. */ - ECTF_FLAGS /* CTF header contains flags unknown to libctf. */ + ECTF_FLAGS, /* CTF header contains flags unknown to libctf. */ + ECTF_NEEDSBFD /* This feature needs a libctf with BFD support. */ }; -#define ECTF_NERR (ECTF_FLAGS - ECTF_BASE + 1) /* Count of CTF errors. */ +#define ECTF_NERR (ECTF_NEEDSBFD - ECTF_BASE + 1) /* Count of CTF errors. */ /* The CTF data model is inferred to be the caller's data model or the data model of the given object, unless ctf_setmodel() is explicitly called. */ @@ -452,10 +453,8 @@ extern int ctf_gzwrite (ctf_file_t *fp, gzFile fd); extern int ctf_compress_write (ctf_file_t * fp, int fd); extern unsigned char *ctf_write_mem (ctf_file_t *, size_t *, size_t threshold); -/* The ctf_link interfaces are not stable yet. No guarantees! */ - extern int ctf_link_add_ctf (ctf_file_t *, ctf_archive_t *, const char *); -extern int ctf_link (ctf_file_t *, int share_mode); +extern int ctf_link (ctf_file_t *, int flags); typedef const char *ctf_link_strtab_string_f (uint32_t *offset, void *arg); extern int ctf_link_add_strtab (ctf_file_t *, ctf_link_strtab_string_f *, void *); diff --git a/libctf/ChangeLog b/libctf/ChangeLog index d54af359ec5..c3451ee5aa6 100644 --- a/libctf/ChangeLog +++ b/libctf/ChangeLog @@ -1,3 +1,48 @@ +2020-07-22 Nick Alcock + + * Makefile.am: Set -DNOBFD=1 in libctf-nobfd, and =0 elsewhere. + * Makefile.in: Regenerated. + * ctf-impl.h (ctf_link_input_name): New. + (ctf_file_t) : New. + * ctf-create.c (ctf_serialize): Adjust accordingly. + * ctf-link.c: Define ctf_open as weak when PIC. + (ctf_arc_close_thunk): Remove unnecessary thunk. + (ctf_file_close_thunk): Likewise. + (ctf_link_input_name): New. + (ctf_link_input_t): New value of the ctf_file_t.ctf_link_input. + (ctf_link_input_close): Adjust accordingly. + (ctf_link_add_ctf_internal): New, split from... + (ctf_link_add_ctf): ... here. Return error if lazy loading of + CTF is not possible. Change to just call... + (ctf_link_add): ... this new function. + (ctf_link_add_cu_mapping): Transition to ctf_err_warn. Drop the + ctf_file_close_thunk. + (ctf_link_in_member_cb_arg_t) Rename to... + : ... this. + : Drop. + : Likewise (migrated to ctf_link_flags). + : Rename to... + : ... this. + : Rename to... + : ... this. + : New. + (ctf_link_one_type): Adjuwt accordingly. Transition to + ctf_err_warn, removing a TODO. + (ctf_link_one_variable): Note a case too common to warn about. + Report in the debug stream if a cu-mapped link prevents addition + of a conflicting variable. + (ctf_link_one_input_archive_member): Adjust. + (ctf_link_lazy_open): New, open a CTF archive for linking when + needed. + (ctf_link_close_one_input_archive): New, close it again. + (ctf_link_one_input_archive): Adjust for lazy opening, member + renames, and ctf_err_warn transition. Move the + empty_link_type_mapping call to... + (ctf_link): ... here. Adjut for renamings and thunk removal. + Don't spuriously fail if some input contains no CTF data. + (ctf_link_write): ctf_err_warn transition. + * libctf.ver: Remove not-yet-stable comment. + 2020-07-22 Nick Alcock * ctf-impl.h (ctf_strerror): Delete. diff --git a/libctf/Makefile.am b/libctf/Makefile.am index cdd3a5c55d6..de27cf82394 100644 --- a/libctf/Makefile.am +++ b/libctf/Makefile.am @@ -41,6 +41,7 @@ endif libctf_nobfd_la_LIBADD = @SHARED_LIBADD@ $(ZLIB) libctf_nobfd_la_LDFLAGS = -version-info 0:0:0 @SHARED_LDFLAGS@ @VERSION_FLAGS@ +libctf_nobfd_la_CPPFLAGS = $(AM_CPPFLAGS) -DNOBFD=1 libctf_nobfd_la_SOURCES = ctf-archive.c ctf-dump.c ctf-create.c ctf-decl.c ctf-error.c \ ctf-hash.c ctf-labels.c ctf-link.c ctf-lookup.c ctf-open.c \ ctf-string.c ctf-subr.c ctf-types.c ctf-util.c @@ -49,6 +50,7 @@ libctf_nobfd_la_SOURCES += ctf-qsort_r.c endif libctf_la_LIBADD = @BFD_LIBADD@ $(libctf_nobfd_la_LIBADD) +libctf_la_CPPFLAGS = $(AM_CPPFLAGS) -DNOBFD=0 libctf_la_DEPENDENCIES = @BFD_DEPENDENCIES@ libctf_la_LDFLAGS = $(libctf_nobfd_la_LDFLAGS) libctf_la_SOURCES = $(libctf_nobfd_la_SOURCES) ctf-open-bfd.c diff --git a/libctf/Makefile.in b/libctf/Makefile.in index a26fa31da49..3b7feea02d2 100644 --- a/libctf/Makefile.in +++ b/libctf/Makefile.in @@ -167,11 +167,15 @@ am__libctf_nobfd_la_SOURCES_DIST = ctf-archive.c ctf-dump.c \ ctf-create.c ctf-decl.c ctf-error.c ctf-hash.c ctf-labels.c \ ctf-link.c ctf-lookup.c ctf-open.c ctf-string.c ctf-subr.c \ ctf-types.c ctf-util.c ctf-qsort_r.c -@NEED_CTF_QSORT_R_TRUE@am__objects_1 = ctf-qsort_r.lo -am_libctf_nobfd_la_OBJECTS = ctf-archive.lo ctf-dump.lo ctf-create.lo \ - ctf-decl.lo ctf-error.lo ctf-hash.lo ctf-labels.lo ctf-link.lo \ - ctf-lookup.lo ctf-open.lo ctf-string.lo ctf-subr.lo \ - ctf-types.lo ctf-util.lo $(am__objects_1) +@NEED_CTF_QSORT_R_TRUE@am__objects_1 = libctf_nobfd_la-ctf-qsort_r.lo +am_libctf_nobfd_la_OBJECTS = libctf_nobfd_la-ctf-archive.lo \ + libctf_nobfd_la-ctf-dump.lo libctf_nobfd_la-ctf-create.lo \ + libctf_nobfd_la-ctf-decl.lo libctf_nobfd_la-ctf-error.lo \ + libctf_nobfd_la-ctf-hash.lo libctf_nobfd_la-ctf-labels.lo \ + libctf_nobfd_la-ctf-link.lo libctf_nobfd_la-ctf-lookup.lo \ + libctf_nobfd_la-ctf-open.lo libctf_nobfd_la-ctf-string.lo \ + libctf_nobfd_la-ctf-subr.lo libctf_nobfd_la-ctf-types.lo \ + libctf_nobfd_la-ctf-util.lo $(am__objects_1) libctf_nobfd_la_OBJECTS = $(am_libctf_nobfd_la_OBJECTS) AM_V_lt = $(am__v_lt_@AM_V@) am__v_lt_ = $(am__v_lt_@AM_DEFAULT_V@) @@ -188,11 +192,15 @@ am__libctf_la_SOURCES_DIST = ctf-archive.c ctf-dump.c ctf-create.c \ ctf-decl.c ctf-error.c ctf-hash.c ctf-labels.c ctf-link.c \ ctf-lookup.c ctf-open.c ctf-string.c ctf-subr.c ctf-types.c \ ctf-util.c ctf-qsort_r.c ctf-open-bfd.c -am__objects_2 = ctf-archive.lo ctf-dump.lo ctf-create.lo ctf-decl.lo \ - ctf-error.lo ctf-hash.lo ctf-labels.lo ctf-link.lo \ - ctf-lookup.lo ctf-open.lo ctf-string.lo ctf-subr.lo \ - ctf-types.lo ctf-util.lo $(am__objects_1) -am_libctf_la_OBJECTS = $(am__objects_2) ctf-open-bfd.lo +@NEED_CTF_QSORT_R_TRUE@am__objects_2 = libctf_la-ctf-qsort_r.lo +am__objects_3 = libctf_la-ctf-archive.lo libctf_la-ctf-dump.lo \ + libctf_la-ctf-create.lo libctf_la-ctf-decl.lo \ + libctf_la-ctf-error.lo libctf_la-ctf-hash.lo \ + libctf_la-ctf-labels.lo libctf_la-ctf-link.lo \ + libctf_la-ctf-lookup.lo libctf_la-ctf-open.lo \ + libctf_la-ctf-string.lo libctf_la-ctf-subr.lo \ + libctf_la-ctf-types.lo libctf_la-ctf-util.lo $(am__objects_2) +am_libctf_la_OBJECTS = $(am__objects_3) libctf_la-ctf-open-bfd.lo libctf_la_OBJECTS = $(am_libctf_la_OBJECTS) libctf_la_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \ $(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \ @@ -444,11 +452,13 @@ AM_CFLAGS = -std=gnu99 @ac_libctf_warn_cflags@ @warn@ @c_warn@ @WARN_PEDANTIC@ @ @INSTALL_LIBBFD_FALSE@noinst_LTLIBRARIES = libctf.la libctf-nobfd.la libctf_nobfd_la_LIBADD = @SHARED_LIBADD@ $(ZLIB) libctf_nobfd_la_LDFLAGS = -version-info 0:0:0 @SHARED_LDFLAGS@ @VERSION_FLAGS@ +libctf_nobfd_la_CPPFLAGS = $(AM_CPPFLAGS) -DNOBFD=1 libctf_nobfd_la_SOURCES = ctf-archive.c ctf-dump.c ctf-create.c \ ctf-decl.c ctf-error.c ctf-hash.c ctf-labels.c ctf-link.c \ ctf-lookup.c ctf-open.c ctf-string.c ctf-subr.c ctf-types.c \ ctf-util.c $(am__append_1) libctf_la_LIBADD = @BFD_LIBADD@ $(libctf_nobfd_la_LIBADD) +libctf_la_CPPFLAGS = $(AM_CPPFLAGS) -DNOBFD=0 libctf_la_DEPENDENCIES = @BFD_DEPENDENCIES@ libctf_la_LDFLAGS = $(libctf_nobfd_la_LDFLAGS) libctf_la_SOURCES = $(libctf_nobfd_la_SOURCES) ctf-open-bfd.c @@ -565,22 +575,37 @@ mostlyclean-compile: distclean-compile: -rm -f *.tab.c -@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-archive.Plo@am__quote@ -@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-create.Plo@am__quote@ -@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-decl.Plo@am__quote@ -@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-dump.Plo@am__quote@ -@AMDEP_TRUE@@am__include@ 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a964c20b9ed..85fd060262e 100644 --- a/libctf/ctf-create.c +++ b/libctf/ctf-create.c @@ -542,6 +542,7 @@ ctf_serialize (ctf_file_t *fp) nfp->ctf_link_type_mapping = fp->ctf_link_type_mapping; nfp->ctf_link_memb_name_changer = fp->ctf_link_memb_name_changer; nfp->ctf_link_memb_name_changer_arg = fp->ctf_link_memb_name_changer_arg; + nfp->ctf_link_flags = fp->ctf_link_flags; nfp->ctf_snapshot_lu = fp->ctf_snapshots; diff --git a/libctf/ctf-impl.h b/libctf/ctf-impl.h index 71b732a2775..cb7de23dbbb 100644 --- a/libctf/ctf-impl.h +++ b/libctf/ctf-impl.h @@ -314,6 +314,9 @@ struct ctf_file ctf_dynhash_t *ctf_link_type_mapping; /* Map input types to output types. */ ctf_dynhash_t *ctf_link_cu_mapping; /* Map CU names to CTF dict names. */ /* Allow the caller to Change the name of link archive members. */ + /* CTF linker flags. */ + int ctf_link_flags; + ctf_link_memb_name_changer_f *ctf_link_memb_name_changer; void *ctf_link_memb_name_changer_arg; /* Argument for it. */ ctf_dynhash_t *ctf_add_processing; /* Types ctf_add_type is working on now. */ @@ -560,6 +563,7 @@ _libctf_printflike_ (3, 4) extern void ctf_err_warn (ctf_file_t *, int is_warning, const char *, ...); extern void ctf_assert_fail_internal (ctf_file_t *, const char *, size_t, const char *); +extern const char *ctf_link_input_name (ctf_file_t *); extern Elf64_Sym *ctf_sym_to_elf64 (const Elf32_Sym *src, Elf64_Sym *dst); extern const char *ctf_lookup_symbol_name (ctf_file_t *fp, unsigned long symidx); diff --git a/libctf/ctf-link.c b/libctf/ctf-link.c index bcfd2564fbc..705701d0eb5 100644 --- a/libctf/ctf-link.c +++ b/libctf/ctf-link.c @@ -20,6 +20,10 @@ #include #include +#if defined (PIC) +#pragma weak ctf_open +#endif + /* Type tracking machinery. */ /* Record the correspondence between a source and ctf_add_type()-added @@ -137,45 +141,143 @@ ctf_type_mapping (ctf_file_t *src_fp, ctf_id_t src_type, ctf_file_t **dst_fp) (otherwise) and returns it, suitable for addition in the .ctf section of the output. */ -/* Add a file to a link. */ - -static void ctf_arc_close_thunk (void *arc) +/* Return the name of the compilation unit this CTF dict or its parent applies + to, or a non-null string otherwise: prefer the parent. Used in debugging + output. Sometimes used for outputs too. */ +const char * +ctf_link_input_name (ctf_file_t *fp) { - ctf_arc_close ((ctf_archive_t *) arc); + if (fp->ctf_parent && fp->ctf_parent->ctf_cuname) + return fp->ctf_parent->ctf_cuname; + else if (fp->ctf_cuname) + return fp->ctf_cuname; + else + return "(unnamed)"; } -static void ctf_file_close_thunk (void *file) +/* The linker inputs look like this. clin_fp is used for short-circuited + CU-mapped links that can entirely avoid the first link phase in some + situations in favour of just passing on the contained ctf_file_t: it is + always the sole ctf_file_t inside the corresponding clin_arc. If set, it + gets assigned directly to the final link inputs and freed from there, so it + never gets explicitly freed in the ctf_link_input. */ +typedef struct ctf_link_input +{ + const char *clin_filename; + ctf_archive_t *clin_arc; + ctf_file_t *clin_fp; + int n; +} ctf_link_input_t; + +static void +ctf_link_input_close (void *input) { - ctf_file_close ((ctf_file_t *) file); + ctf_link_input_t *i = (ctf_link_input_t *) input; + if (i->clin_arc) + ctf_arc_close (i->clin_arc); + free (i); } -int -ctf_link_add_ctf (ctf_file_t *fp, ctf_archive_t *ctf, const char *name) +/* Like ctf_link_add_ctf, below, but with no error-checking, so it can be called + in the middle of an ongoing link. */ +static int +ctf_link_add_ctf_internal (ctf_file_t *fp, ctf_archive_t *ctf, + ctf_file_t *fp_input, const char *name) { + ctf_link_input_t *input = NULL; char *dupname = NULL; - if (fp->ctf_link_outputs) - return (ctf_set_errno (fp, ECTF_LINKADDEDLATE)); - if (fp->ctf_link_inputs == NULL) - fp->ctf_link_inputs = ctf_dynhash_create (ctf_hash_string, - ctf_hash_eq_string, free, - ctf_arc_close_thunk); - - if (fp->ctf_link_inputs == NULL) + if ((input = calloc (1, sizeof (ctf_link_input_t))) == NULL) goto oom; if ((dupname = strdup (name)) == NULL) goto oom; - if (ctf_dynhash_insert (fp->ctf_link_inputs, dupname, ctf) < 0) + input->clin_arc = ctf; + input->clin_fp = fp_input; + input->clin_filename = dupname; + input->n = ctf_dynhash_elements (fp->ctf_link_inputs); + + if (ctf_dynhash_insert (fp->ctf_link_inputs, dupname, input) < 0) goto oom; return 0; oom: - free (fp->ctf_link_inputs); - fp->ctf_link_inputs = NULL; + free (input); free (dupname); - return (ctf_set_errno (fp, ENOMEM)); + return ctf_set_errno (fp, ENOMEM); +} + +/* Add a file, memory buffer, or unopened file (by name) to a link. + + You can call this with: + + CTF and NAME: link the passed ctf_archive_t, with the given NAME. + NAME alone: open NAME as a CTF file when needed. + BUF and NAME: open the BUF (of length N) as CTF, with the given NAME. (Not + yet implemented.) + + Passed in CTF args are owned by the dictionary and will be freed by it. + The BUF arg is *not* owned by the dictionary, and the user should not free + its referent until the link is done. + + The order of calls to this function influences the order of types in the + final link output, but otherwise is not important. + + Private for now, but may in time become public once support for BUF is + implemented. */ + +static int +ctf_link_add (ctf_file_t *fp, ctf_archive_t *ctf, const char *name, + void *buf _libctf_unused_, size_t n _libctf_unused_) +{ + if (buf) + return (ctf_set_errno (fp, ECTF_NOTYET)); + + if (!((ctf && name && !buf) + || (name && !buf && !ctf) + || (buf && name && !ctf))) + return (ctf_set_errno (fp, EINVAL)); + + /* We can only lazily open files if libctf.so is in use rather than + libctf-nobfd.so. This is a little tricky: in shared libraries, we can use + a weak symbol so that -lctf -lctf-nobfd works, but in static libraries we + must distinguish between the two libraries explicitly. */ + +#if defined (PIC) + if (!buf && !ctf && name && !ctf_open) + return (ctf_set_errno (fp, ECTF_NEEDSBFD)); +#elif NOBFD + if (!buf && !ctf && name) + return (ctf_set_errno (fp, ECTF_NEEDSBFD)); +#endif + + if (fp->ctf_link_outputs) + return (ctf_set_errno (fp, ECTF_LINKADDEDLATE)); + if (fp->ctf_link_inputs == NULL) + fp->ctf_link_inputs = ctf_dynhash_create (ctf_hash_string, + ctf_hash_eq_string, free, + ctf_link_input_close); + + if (fp->ctf_link_inputs == NULL) + return (ctf_set_errno (fp, ENOMEM)); + + return ctf_link_add_ctf_internal (fp, ctf, NULL, name); +} + +/* Add an opened CTF archive or unopened file (by name) to a link. + If CTF is NULL and NAME is non-null, an unopened file is meant: + otherwise, the specified archive is assumed to have the given NAME. + + Passed in CTF args are owned by the dictionary and will be freed by it. + + The order of calls to this function influences the order of types in the + final link output, but otherwise is not important. */ + +int +ctf_link_add_ctf (ctf_file_t *fp, ctf_archive_t *ctf, const char *name) +{ + return ctf_link_add (fp, ctf, name, NULL, 0); } /* Return a per-CU output CTF dictionary suitable for the given CU, creating and @@ -210,9 +312,9 @@ ctf_create_per_cu (ctf_file_t *fp, const char *filename, const char *cuname) if ((cu_fp = ctf_create (&err)) == NULL) { - ctf_dprintf ("Cannot create per-CU CTF archive for CU %s from " - "input file %s: %s\n", cuname, filename, - ctf_errmsg (err)); + ctf_err_warn (fp, 0, "Cannot create per-CU CTF archive for " + "CU %s from input file %s: %s", cuname, filename, + ctf_errmsg (err)); ctf_set_errno (fp, err); return NULL; } @@ -262,7 +364,8 @@ ctf_link_add_cu_mapping (ctf_file_t *fp, const char *from, const char *to) if (fp->ctf_link_outputs == NULL) fp->ctf_link_outputs = ctf_dynhash_create (ctf_hash_string, ctf_hash_eq_string, free, - ctf_file_close_thunk); + (ctf_hash_free_fun) + ctf_file_close); if (fp->ctf_link_outputs == NULL) return ctf_set_errno (fp, ENOMEM); @@ -310,15 +413,27 @@ ctf_link_set_memb_name_changer (ctf_file_t *fp, typedef struct ctf_link_in_member_cb_arg { + /* The shared output dictionary. */ ctf_file_t *out_fp; - const char *file_name; + + /* The filename of the input file, and an fp to each dictionary in that file + in turn. */ + const char *in_file_name; ctf_file_t *in_fp; - ctf_file_t *main_input_fp; + + /* The CU name of the dict being processed. */ const char *cu_name; - char *arcname; - int done_main_member; - int share_mode; int in_input_cu_file; + + /* The parent dictionary in the input, and whether it's been processed yet. + Not needed by ctf_link_one_type / ctf_link_one_variable, only by higher + layers. */ + ctf_file_t *in_fp_parent; + int done_parent; + + /* If true, this is the CU-mapped portion of a deduplicating link: no child + dictionaries should be created. */ + int cu_mapped; } ctf_link_in_member_cb_arg_t; /* Link one type into the link. We rely on ctf_add_type() to detect @@ -332,9 +447,9 @@ ctf_link_one_type (ctf_id_t type, int isroot _libctf_unused_, void *arg_) ctf_file_t *per_cu_out_fp; int err; - if (arg->share_mode != CTF_LINK_SHARE_UNCONFLICTED) + if (arg->in_fp->ctf_link_flags != CTF_LINK_SHARE_UNCONFLICTED) { - ctf_dprintf ("Share-duplicated mode not yet implemented.\n"); + ctf_err_warn (arg->out_fp, 0, "Share-duplicated mode not yet implemented"); return ctf_set_errno (arg->out_fp, ECTF_NOTYET); } @@ -352,19 +467,18 @@ ctf_link_one_type (ctf_id_t type, int isroot _libctf_unused_, void *arg_) if (err != ECTF_CONFLICT) { if (err != ECTF_NONREPRESENTABLE) - ctf_dprintf ("Cannot link type %lx from archive member %s, input file %s " - "into output link: %s\n", type, arg->arcname, arg->file_name, - ctf_errmsg (err)); + ctf_err_warn (arg->out_fp, 1, "Cannot link type %lx from input file %s, " + "CU %s into output link: %s", type, arg->cu_name, + arg->in_file_name, ctf_errmsg (err)); /* We must ignore this problem or we end up losing future types, then trying to link the variables in, then exploding. Better to link as - much as possible. XXX when we add a proper link warning - infrastructure, we should report the error here! */ + much as possible. */ return 0; } ctf_set_errno (arg->out_fp, 0); } - if ((per_cu_out_fp = ctf_create_per_cu (arg->out_fp, arg->file_name, + if ((per_cu_out_fp = ctf_create_per_cu (arg->out_fp, arg->in_file_name, arg->cu_name)) == NULL) return -1; /* Errno is set for us. */ @@ -373,10 +487,10 @@ ctf_link_one_type (ctf_id_t type, int isroot _libctf_unused_, void *arg_) err = ctf_errno (per_cu_out_fp); if (err != ECTF_NONREPRESENTABLE) - ctf_dprintf ("Cannot link type %lx from CTF archive member %s, input file %s " - "into output per-CU CTF archive member %s: %s: skipped\n", type, - arg->arcname, arg->file_name, arg->arcname, - ctf_errmsg (err)); + ctf_err_warn (arg->out_fp, 1, "Cannot link type %lx from input file %s, CU %s " + "into output per-CU CTF archive member %s: %s: skipped", type, + ctf_link_input_name (arg->in_fp), arg->in_file_name, + ctf_link_input_name (per_cu_out_fp), ctf_errmsg (err)); if (err == ECTF_CONFLICT) /* Conflicts are possible at this stage only if a non-ld user has combined multiple TUs into a single output dictionary. Even in this case we do not @@ -402,8 +516,9 @@ check_variable (const char *name, ctf_file_t *fp, ctf_id_t type, if (dvd->dvd_type != type) { /* Variable here. Wrong type: cannot add. Just skip it, because there is - no way to express this in CTF. (This might be the parent, in which - case we'll try adding in the child first, and only then give up.) */ + no way to express this in CTF. Don't even warn: this case is too + common. (This might be the parent, in which case we'll try adding in + the child first, and only then give up.) */ ctf_dprintf ("Inexpressible duplicate variable %s skipped.\n", name); } @@ -448,9 +563,18 @@ ctf_link_one_variable (const char *name, ctf_id_t type, void *arg_) /* Can't add to the parent due to a name clash, or because it references a type only present in the child. Try adding to the child, creating if need - be. */ + be. If we can't do that, skip it. Don't add to a child if we're doing a + CU-mapped link, since that has only one output. */ + + if (arg->cu_mapped) + { + ctf_dprintf ("Variable %s in input file %s depends on a type %lx hidden " + "due to conflicts: skipped.\n", name, arg->in_file_name, + type); + return 0; + } - if ((per_cu_out_fp = ctf_create_per_cu (arg->out_fp, arg->file_name, + if ((per_cu_out_fp = ctf_create_per_cu (arg->out_fp, arg->in_file_name, arg->cu_name)) == NULL) return -1; /* Errno is set for us. */ @@ -462,8 +586,9 @@ ctf_link_one_variable (const char *name, ctf_id_t type, void *arg_) if (dst_type == 0) { - ctf_dprintf ("Type %lx for variable %s in input file %s not " - "found: skipped.\n", type, name, arg->file_name); + ctf_err_warn (arg->out_fp, 1, "Type %lx for variable %s in input " + "file %s not found: skipped", type, name, + arg->in_file_name); /* Do not terminate the link: just skip the variable. */ return 0; } @@ -475,11 +600,11 @@ ctf_link_one_variable (const char *name, ctf_id_t type, void *arg_) return 0; } -/* Merge every type and variable in this archive member into the link, so we can - relink things that have already had ld run on them. We use the archive - member name, sans any leading '.ctf.', as the CU name for ambiguous types if - there is one and it's not the default: otherwise, we use the name of the - input file. */ +/* Merge every type (and optionally, variable) in this archive member into the + link, so we can relink things that have already had ld run on them. We use + the archive member name, sans any leading '.ctf.', as the CU name for + ambiguous types if there is one and it's not the default: otherwise, we use + the name of the input file. */ static int ctf_link_one_input_archive_member (ctf_file_t *in_fp, const char *name, void *arg_) { @@ -497,32 +622,16 @@ ctf_link_one_input_archive_member (ctf_file_t *in_fp, const char *name, void *ar causes the system to erroneously conclude that all types are duplicated and should be shared, even if they are not. */ - if (arg->done_main_member) + if (arg->done_parent) return 0; - arg->arcname = strdup (".ctf."); - if (arg->arcname) - { - char *new_name; - - new_name = ctf_str_append (arg->arcname, arg->file_name); - if (new_name) - arg->arcname = new_name; - else - free (arg->arcname); - } } else { - arg->arcname = strdup (name); - /* Get ambiguous types from our parent. */ - ctf_import (in_fp, arg->main_input_fp); + ctf_import (in_fp, arg->in_fp_parent); arg->in_input_cu_file = 1; } - if (!arg->arcname) - return ctf_set_errno (in_fp, ENOMEM); - arg->cu_name = name; if (strncmp (arg->cu_name, ".ctf.", strlen (".ctf.")) == 0) arg->cu_name += strlen (".ctf."); @@ -532,7 +641,6 @@ ctf_link_one_input_archive_member (ctf_file_t *in_fp, const char *name, void *ar err = ctf_variable_iter (in_fp, ctf_link_one_variable, arg); arg->in_input_cu_file = 0; - free (arg->arcname); if (err < 0) return -1; /* Errno is set for us. */ @@ -551,61 +659,128 @@ empty_link_type_mapping (void *key _libctf_unused_, void *value, ctf_dynhash_empty (fp->ctf_link_type_mapping); } +/* Lazily open a CTF archive for linking, if not already open. + + Returns the number of files contained within the opened archive (0 for none), + or -1 on error, as usual. */ +static ssize_t +ctf_link_lazy_open (ctf_file_t *fp, ctf_link_input_t *input) +{ + size_t count; + int err; + + if (input->clin_arc) + return ctf_archive_count (input->clin_arc); + + if (input->clin_fp) + return 1; + + /* See ctf_link_add_ctf. */ +#if defined (PIC) || !NOBFD + input->clin_arc = ctf_open (input->clin_filename, NULL, &err); +#else + ctf_err_warn (fp, 0, "Cannot open %s lazily: %s", input->clin_filename, + ctf_errmsg (ECTF_NEEDSBFD)); + ctf_set_errno (fp, ECTF_NEEDSBFD); + return -1; +#endif + + /* Having no CTF sections is not an error. We just don't need to do + anything. */ + + if (!input->clin_arc) + { + if (err == ECTF_NOCTFDATA) + return 0; + + ctf_err_warn (fp, 0, "Opening CTF %s failed: %s", + input->clin_filename, ctf_errmsg (err)); + ctf_set_errno (fp, err); + return -1; + } + + if ((count = ctf_archive_count (input->clin_arc)) == 0) + ctf_arc_close (input->clin_arc); + + return (ssize_t) count; +} + +/* Close an input, as a ctf_dynhash_iter iterator. */ +static void +ctf_link_close_one_input_archive (void *key _libctf_unused_, void *value, + void *arg _libctf_unused_) +{ + ctf_link_input_t *input = (ctf_link_input_t *) value; + if (input->clin_arc) + ctf_arc_close (input->clin_arc); + input->clin_arc = NULL; +} + /* Link one input file's types into the output file. */ static void ctf_link_one_input_archive (void *key, void *value, void *arg_) { const char *file_name = (const char *) key; - ctf_archive_t *arc = (ctf_archive_t *) value; + ctf_link_input_t *input = (ctf_link_input_t *)value; ctf_link_in_member_cb_arg_t *arg = (ctf_link_in_member_cb_arg_t *) arg_; - int err; + int err = 0; + + if (!input->clin_arc) + { + err = ctf_link_lazy_open (arg->out_fp, input); + if (err == 0) /* Just no CTF. */ + return; + + if (err < 0) + return; /* errno is set for us. */ + } - arg->file_name = file_name; - arg->done_main_member = 0; - if ((arg->main_input_fp = ctf_arc_open_by_name (arc, NULL, &err)) == NULL) + arg->in_file_name = file_name; + arg->done_parent = 0; + if ((arg->in_fp_parent = ctf_arc_open_by_name (input->clin_arc, NULL, + &err)) == NULL) if (err != ECTF_ARNNAME) { - ctf_dprintf ("Cannot open main archive member in input file %s in the " - "link: skipping: %s.\n", arg->file_name, - ctf_errmsg (err)); - return; + ctf_err_warn (arg->out_fp, 0, "Cannot open main archive member in " + "input file %s in the link: skipping: %s", + arg->in_file_name, ctf_errmsg (err)); + goto out; } - if (ctf_link_one_input_archive_member (arg->main_input_fp, + if (ctf_link_one_input_archive_member (arg->in_fp_parent, _CTF_SECTION, arg) < 0) { - ctf_file_close (arg->main_input_fp); - return; + ctf_file_close (arg->in_fp_parent); + goto out; } - arg->done_main_member = 1; - if (ctf_archive_iter (arc, ctf_link_one_input_archive_member, arg) < 0) - ctf_dprintf ("Cannot traverse archive in input file %s: link " - "cannot continue: %s.\n", arg->file_name, - ctf_errmsg (ctf_errno (arg->out_fp))); + arg->done_parent = 1; + if (ctf_archive_iter (input->clin_arc, ctf_link_one_input_archive_member, + arg) < 0) + ctf_err_warn (arg->out_fp, 0, "Cannot traverse archive in input file %s: " + "link cannot continue: %s", arg->in_file_name, + ctf_errmsg (ctf_errno (arg->out_fp))); else { /* The only error indication to the caller is the errno: so ensure that it is zero if there was no actual error from the caller. */ ctf_set_errno (arg->out_fp, 0); } - ctf_file_close (arg->main_input_fp); + ctf_file_close (arg->in_fp_parent); - /* Discard the now-unnecessary mapping table data. */ - if (arg->out_fp->ctf_link_type_mapping) - ctf_dynhash_empty (arg->out_fp->ctf_link_type_mapping); - ctf_dynhash_iter (arg->out_fp->ctf_link_outputs, empty_link_type_mapping, NULL); + out: + ctf_link_close_one_input_archive (key, value, NULL); } /* Merge types and variable sections in all files added to the link - together. */ + together. All the added files are closed. */ int -ctf_link (ctf_file_t *fp, int share_mode) +ctf_link (ctf_file_t *fp, int flags) { ctf_link_in_member_cb_arg_t arg; memset (&arg, 0, sizeof (struct ctf_link_in_member_cb_arg)); arg.out_fp = fp; - arg.share_mode = share_mode; + fp->ctf_link_flags = flags; if (fp->ctf_link_inputs == NULL) return 0; /* Nothing to do. */ @@ -613,7 +788,8 @@ ctf_link (ctf_file_t *fp, int share_mode) if (fp->ctf_link_outputs == NULL) fp->ctf_link_outputs = ctf_dynhash_create (ctf_hash_string, ctf_hash_eq_string, free, - ctf_file_close_thunk); + (ctf_hash_free_fun) + ctf_file_close); if (fp->ctf_link_outputs == NULL) return ctf_set_errno (fp, ENOMEM); @@ -621,7 +797,12 @@ ctf_link (ctf_file_t *fp, int share_mode) ctf_dynhash_iter (fp->ctf_link_inputs, ctf_link_one_input_archive, &arg); - if (ctf_errno (fp) != 0) + /* Discard the now-unnecessary mapping table data from all the outputs. */ + if (fp->ctf_link_type_mapping) + ctf_dynhash_empty (fp->ctf_link_type_mapping); + ctf_dynhash_iter (fp->ctf_link_outputs, empty_link_type_mapping, NULL); + + if ((ctf_errno (fp) != 0) && (ctf_errno (fp) != ECTF_NOCTFDATA)) return -1; return 0; } @@ -908,7 +1089,7 @@ ctf_link_write (ctf_file_t *fp, size_t *size, size_t threshold) free (arg.dynames[i]); free (arg.dynames); } - ctf_dprintf ("Cannot write archive in link: %s failure: %s\n", errloc, - ctf_errmsg (ctf_errno (fp))); + ctf_err_warn (fp, 0, "Cannot write archive in link: %s failure: %s", errloc, + ctf_errmsg (ctf_errno (fp))); return NULL; } diff --git a/libctf/libctf.ver b/libctf/libctf.ver index f1c9b2bf003..7eed14ae54d 100644 --- a/libctf/libctf.ver +++ b/libctf/libctf.ver @@ -156,8 +156,6 @@ LIBCTF_1.0 { ctf_getdebug; ctf_errwarning_next; - /* Not yet part of the stable API. */ - ctf_link_add_ctf; ctf_link_add_cu_mapping; ctf_link_set_memb_name_changer;