ld: Limit cache size and add --max-cache-size=SIZE

When link_info.keep_memory is true, linker caches the relocation
information and symbol tables of input files in memory.  When there
are many input files with many relocations, we may run out of memory.
Add --max-cache-size=SIZE to set the maximum cache size.

bfd/

	PR ld/18028
	* bfd.c (bfd): Add alloc_size.
	* elf-bfd.h (_bfd_elf_link_info_read_relocs): New.
	* elf32-i386.c (elf_i386_check_relocs): Use _bfd_link_keep_memory.
	Update cache_size.
	* elf64-x86-64.c (elf_x86_64_check_relocs): Likewise.
	* elflink.c (_bfd_elf_link_read_relocs): Renamed to ...
	(_bfd_elf_link_info_read_relocs): This.  Update cache_size.
	(_bfd_elf_link_read_relocs): New.
	(_bfd_elf_link_check_relocs): Call _bfd_elf_link_info_read_relocs
	instead of _bfd_elf_link_read_relocs.
	(elf_link_add_object_symbols): Likewise.
	(elf_link_input_bfd): Likewise.
	(init_reloc_cookie_rels): Likewise.
	(init_reloc_cookie): Update cache_size.  Call
	_bfd_elf_link_info_read_relocs instead of
	_bfd_elf_link_read_relocs.
	(link_info_ok): New.
	(elf_gc_smash_unused_vtentry_relocs): Updated.  Call
	_bfd_elf_link_info_read_relocs instead of
	_bfd_elf_link_read_relocs.
	(bfd_elf_gc_sections): Use link_info_ok.  Pass &link_info_ok
	to elf_gc_smash_unused_vtentry_relocs.
	* libbfd-in.h (_bfd_link_keep_memory): New.
	* linker.c (_bfd_link_keep_memory): New.
	* opncls.c (bfd_alloc): Update alloc_size.
	* bfd-in2.h: Regenerated.
	* libbfd.h: Likewise.

include/

	PR ld/18028
	* bfdlink.h (bfd_link_info): Add cache_size and max_cache_size.

ld/

	PR ld/18028
	* NEWS: Mention --max-cache-size=SIZE.
	* ld.texi: Document --max-cache-size=SIZE.
	* ldlex.h (option_values): Add OPTION_MAX_CACHE_SIZE.
	* ldmain.c: (main): Set link_info.max_cache_size to -1.
	* lexsup.c (ld_options): Add --max-cache-size=SIZE.
	(parse_args): Support OPTION_MAX_CACHE_SIZE.
	* testsuite/ld-bootstrap/bootstrap.exp: Add test for
	--max-cache-size=-1.

6 files changed, 28 insertions, 1 deletions

diff --git a/ld/NEWS b/ld/NEWS
index 11bc5745ebf..92dd4fd97cd 100644
--- a/ld/NEWS
+++ b/ld/NEWS
@@ -1,5 +1,8 @@
 -*- text -*-
 
+* Add --max-cache-size=SIZE to set the the maximum cache size to SIZE
+  bytes.
+
 Changes in 2.37:
 
 * arm-symbianelf support removed.
diff --git a/ld/ld.texi b/ld/ld.texi
index dd8f571d4e4..67c50839b37 100644
--- a/ld/ld.texi
+++ b/ld/ld.texi
@@ -2839,6 +2839,12 @@ has been used.
 The @option{--reduce-memory-overheads} switch may be also be used to
 enable other tradeoffs in future versions of the linker.
 
+@kindex --max-cache-size=@var{size}
+@item --max-cache-size=@var{size}
+@command{ld} normally caches the relocation information and symbol tables
+of input files in memory with the unlimited size.  This option sets the
+maximum cache size to @var{size}.
+
 @kindex --build-id
 @kindex --build-id=@var{style}
 @item --build-id
diff --git a/ld/ldlex.h b/ld/ldlex.h
index 9e8bf5fb835..9707d57caf8 100644
--- a/ld/ldlex.h
+++ b/ld/ldlex.h
@@ -140,6 +140,7 @@ enum option_values
   OPTION_WARN_TEXTREL,
   OPTION_WARN_ALTERNATE_EM,
   OPTION_REDUCE_MEMORY_OVERHEADS,
+  OPTION_MAX_CACHE_SIZE,
 #if BFD_SUPPORTS_PLUGINS
   OPTION_PLUGIN,
   OPTION_PLUGIN_OPT,
diff --git a/ld/ldmain.c b/ld/ldmain.c
index 42660eb9a3c..e4c67740e37 100644
--- a/ld/ldmain.c
+++ b/ld/ldmain.c
@@ -331,6 +331,7 @@ main (int argc, char **argv)
 
   link_info.allow_undefined_version = true;
   link_info.keep_memory = true;
+  link_info.max_cache_size = (bfd_size_type) -1;
   link_info.combreloc = true;
   link_info.strip_discarded = true;
   link_info.prohibit_multiple_definition_absolute = false;
diff --git a/ld/lexsup.c b/ld/lexsup.c
index 00274c500d0..c128fe3a96b 100644
--- a/ld/lexsup.c
+++ b/ld/lexsup.c
@@ -433,6 +433,10 @@ static const struct ld_option ld_options[] =
      OPTION_REDUCE_MEMORY_OVERHEADS},
     '\0', NULL, N_("Reduce memory overheads, possibly taking much longer"),
     TWO_DASHES },
+  { {"max-cache-size=SIZE", required_argument, NULL,
+    OPTION_MAX_CACHE_SIZE},
+    '\0', NULL, N_("Set the maximum cache size to SIZE bytes"),
+    TWO_DASHES },
   { {"relax", no_argument, NULL, OPTION_RELAX},
     '\0', NULL, N_("Reduce code size by using target specific optimizations"), TWO_DASHES },
   { {"no-relax", no_argument, NULL, OPTION_NO_RELAX},
@@ -1631,6 +1635,17 @@ parse_args (unsigned argc, char **argv)
 	    config.hash_table_size = 1021;
 	  break;
 
+	case OPTION_MAX_CACHE_SIZE:
+	  {
+	    char *end;
+	    bfd_size_type cache_size = strtoul (optarg, &end, 0);
+	    if (*end != '\0')
+	      einfo (_("%F%P: invalid cache memory size: %s\n"),
+		     optarg);
+	    link_info.max_cache_size = cache_size;
+	  }
+	  break;
+
 	case OPTION_HASH_SIZE:
 	  {
 	    bfd_size_type new_size;
diff --git a/ld/testsuite/ld-bootstrap/bootstrap.exp b/ld/testsuite/ld-bootstrap/bootstrap.exp
index b21b48ab20e..9c27c5ff5d9 100644
--- a/ld/testsuite/ld-bootstrap/bootstrap.exp
+++ b/ld/testsuite/ld-bootstrap/bootstrap.exp
@@ -55,7 +55,8 @@ if [check_plugin_api_available] {
 # really test -r.  Use ld1 to link a fresh ld, ld2.  Use ld2 to link a
 # new ld, ld3.  ld2 and ld3 should be identical.
 set test_flags {"" "strip" "--static" "-Wl,--traditional-format"
-		"-Wl,--no-keep-memory" "-Wl,--relax"}
+		"-Wl,--no-keep-memory" "-Wl,--relax"
+		"-Wl,--max-cache-size=-1"}
 if { [istarget "powerpc-*-*"] } {
     lappend test_flags "-Wl,--ppc476-workaround"
 }