* layout.cc (Layout::section_name_mapping): New array, replacing
Layout::linkonce_mapping. (Layout::section_name_mapping_count): New variable, replacing Layout::linkonce_mapping_count. (Layout::linkonce_output_name): Remove. (Layout::output_section_name): Rewrite. * layout.h (class Layout): Rename Linkonce_mapping to Section_name_mapping, linkonce_mapping to section_name_mapping, linkonce_mapping_count to section_name_mapping_count. Don't declare linkonce_output_name.
This commit is contained in:
Ian Lance Taylor
parent
db468abb98
commit
dff1629750
3 changed files with 77 additions and 108 deletions
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@ -1,3 +1,16 @@
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2009-06-03 Ian Lance Taylor <iant@google.com>
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* layout.cc (Layout::section_name_mapping): New array, replacing
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Layout::linkonce_mapping.
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(Layout::section_name_mapping_count): New variable, replacing
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Layout::linkonce_mapping_count.
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(Layout::linkonce_output_name): Remove.
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(Layout::output_section_name): Rewrite.
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* layout.h (class Layout): Rename Linkonce_mapping to
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Section_name_mapping, linkonce_mapping to section_name_mapping,
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linkonce_mapping_count to section_name_mapping_count. Don't
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declare linkonce_output_name.
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2009-06-03 Doug Kwan <dougkwan@google.com>
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* gold/arm.cc (namespace utils): New.
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159
gold/layout.cc
159
gold/layout.cc
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@ -2841,57 +2841,58 @@ Layout::finish_dynamic_section(const Input_objects* input_objects,
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odyn->add_constant(elfcpp::DT_FLAGS_1, flags);
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}
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// The mapping of .gnu.linkonce section names to real section names.
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// The mapping of input section name prefixes to output section names.
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// In some cases one prefix is itself a prefix of another prefix; in
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// such a case the longer prefix must come first. These prefixes are
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// based on the GNU linker default ELF linker script.
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#define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 }
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const Layout::Linkonce_mapping Layout::linkonce_mapping[] =
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const Layout::Section_name_mapping Layout::section_name_mapping[] =
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{
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MAPPING_INIT("d.rel.ro.local", ".data.rel.ro.local"), // Before "d.rel.ro".
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MAPPING_INIT("d.rel.ro", ".data.rel.ro"), // Before "d".
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MAPPING_INIT("t", ".text"),
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MAPPING_INIT("r", ".rodata"),
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MAPPING_INIT("d", ".data"),
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MAPPING_INIT("b", ".bss"),
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MAPPING_INIT("s", ".sdata"),
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MAPPING_INIT("sb", ".sbss"),
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MAPPING_INIT("s2", ".sdata2"),
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MAPPING_INIT("sb2", ".sbss2"),
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MAPPING_INIT("wi", ".debug_info"),
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MAPPING_INIT("td", ".tdata"),
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MAPPING_INIT("tb", ".tbss"),
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MAPPING_INIT("lr", ".lrodata"),
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MAPPING_INIT("l", ".ldata"),
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MAPPING_INIT("lb", ".lbss"),
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MAPPING_INIT(".text.", ".text"),
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MAPPING_INIT(".ctors.", ".ctors"),
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MAPPING_INIT(".dtors.", ".dtors"),
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MAPPING_INIT(".rodata.", ".rodata"),
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MAPPING_INIT(".data.rel.ro.local", ".data.rel.ro.local"),
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MAPPING_INIT(".data.rel.ro", ".data.rel.ro"),
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MAPPING_INIT(".data.", ".data"),
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MAPPING_INIT(".bss.", ".bss"),
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MAPPING_INIT(".tdata.", ".tdata"),
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MAPPING_INIT(".tbss.", ".tbss"),
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MAPPING_INIT(".init_array.", ".init_array"),
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MAPPING_INIT(".fini_array.", ".fini_array"),
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MAPPING_INIT(".sdata.", ".sdata"),
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MAPPING_INIT(".sbss.", ".sbss"),
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// FIXME: In the GNU linker, .sbss2 and .sdata2 are handled
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// differently depending on whether it is creating a shared library.
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MAPPING_INIT(".sdata2.", ".sdata"),
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MAPPING_INIT(".sbss2.", ".sbss"),
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MAPPING_INIT(".lrodata.", ".lrodata"),
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MAPPING_INIT(".ldata.", ".ldata"),
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MAPPING_INIT(".lbss.", ".lbss"),
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MAPPING_INIT(".gcc_except_table.", ".gcc_except_table"),
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MAPPING_INIT(".gnu.linkonce.d.rel.ro.local.", ".data.rel.ro.local"),
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MAPPING_INIT(".gnu.linkonce.d.rel.ro.", ".data.rel.ro"),
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MAPPING_INIT(".gnu.linkonce.t.", ".text"),
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MAPPING_INIT(".gnu.linkonce.r.", ".rodata"),
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MAPPING_INIT(".gnu.linkonce.d.", ".data"),
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MAPPING_INIT(".gnu.linkonce.b.", ".bss"),
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MAPPING_INIT(".gnu.linkonce.s.", ".sdata"),
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MAPPING_INIT(".gnu.linkonce.sb.", ".sbss"),
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MAPPING_INIT(".gnu.linkonce.s2.", ".sdata"),
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MAPPING_INIT(".gnu.linkonce.sb2.", ".sbss"),
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MAPPING_INIT(".gnu.linkonce.wi.", ".debug_info"),
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MAPPING_INIT(".gnu.linkonce.td.", ".tdata"),
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MAPPING_INIT(".gnu.linkonce.tb.", ".tbss"),
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MAPPING_INIT(".gnu.linkonce.lr.", ".lrodata"),
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MAPPING_INIT(".gnu.linkonce.l.", ".ldata"),
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MAPPING_INIT(".gnu.linkonce.lb.", ".lbss"),
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};
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#undef MAPPING_INIT
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const int Layout::linkonce_mapping_count =
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sizeof(Layout::linkonce_mapping) / sizeof(Layout::linkonce_mapping[0]);
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// Return the name of the output section to use for a .gnu.linkonce
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// section. This is based on the default ELF linker script of the old
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// GNU linker. For example, we map a name like ".gnu.linkonce.t.foo"
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// to ".text". Set *PLEN to the length of the name. *PLEN is
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// initialized to the length of NAME.
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const char*
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Layout::linkonce_output_name(const char* name, size_t *plen)
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{
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const char* s = name + sizeof(".gnu.linkonce") - 1;
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if (*s != '.')
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return name;
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++s;
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const Linkonce_mapping* plm = linkonce_mapping;
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for (int i = 0; i < linkonce_mapping_count; ++i, ++plm)
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{
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if (strncmp(s, plm->from, plm->fromlen) == 0 && s[plm->fromlen] == '.')
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{
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*plen = plm->tolen;
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return plm->to;
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}
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}
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return name;
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}
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const int Layout::section_name_mapping_count =
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(sizeof(Layout::section_name_mapping)
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/ sizeof(Layout::section_name_mapping[0]));
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// Choose the output section name to use given an input section name.
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// Set *PLEN to the length of the name. *PLEN is initialized to the
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@ -2900,13 +2901,6 @@ Layout::linkonce_output_name(const char* name, size_t *plen)
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const char*
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Layout::output_section_name(const char* name, size_t* plen)
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{
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if (Layout::is_linkonce(name))
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{
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// .gnu.linkonce sections are laid out as though they were named
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// for the sections are placed into.
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return Layout::linkonce_output_name(name, plen);
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}
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// gcc 4.3 generates the following sorts of section names when it
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// needs a section name specific to a function:
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// .text.FN
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@ -2933,58 +2927,25 @@ Layout::output_section_name(const char* name, size_t* plen)
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// Also of interest: .rodata.strN.N, .rodata.cstN, both of which the
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// GNU linker maps to .rodata.
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// The .data.rel.ro sections enable a security feature triggered by
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// the -z relro option. Section which need to be relocated at
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// program startup time but which may be readonly after startup are
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// grouped into .data.rel.ro. They are then put into a PT_GNU_RELRO
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// segment. The dynamic linker will make that segment writable,
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// perform relocations, and then make it read-only. FIXME: We do
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// not yet implement this optimization.
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// The .data.rel.ro sections are used with -z relro. The sections
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// are recognized by name. We use the same names that the GNU
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// linker does for these sections.
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// It is hard to handle this in a principled way.
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// It is hard to handle this in a principled way, so we don't even
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// try. We use a table of mappings. If the input section name is
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// not found in the table, we simply use it as the output section
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// name.
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// These are the rules we follow:
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// If the section name has no initial '.', or no dot other than an
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// initial '.', we use the name unchanged (i.e., "mysection" and
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// ".text" are unchanged).
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// If the name starts with '.note', we keep it unchanged (e.g. to
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// avoid truncating '.note.ABI-tag' to '.note').
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// If the name starts with ".data.rel.ro.local" we use
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// ".data.rel.ro.local".
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// If the name starts with ".data.rel.ro" we use ".data.rel.ro".
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// Otherwise, we drop the second '.' and everything that comes after
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// it (i.e., ".text.XXX" becomes ".text").
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const char* s = name;
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if (*s != '.')
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return name;
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++s;
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const char* sdot = strchr(s, '.');
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if (sdot == NULL)
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return name;
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if (strncmp(name, ".note.", 6) == 0)
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return name;
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const char* const data_rel_ro_local = ".data.rel.ro.local";
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if (strncmp(name, data_rel_ro_local, strlen(data_rel_ro_local)) == 0)
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const Section_name_mapping* psnm = section_name_mapping;
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for (int i = 0; i < section_name_mapping_count; ++i, ++psnm)
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{
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*plen = strlen(data_rel_ro_local);
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return data_rel_ro_local;
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if (strncmp(name, psnm->from, psnm->fromlen) == 0)
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{
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*plen = psnm->tolen;
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return psnm->to;
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}
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}
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const char* const data_rel_ro = ".data.rel.ro";
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if (strncmp(name, data_rel_ro, strlen(data_rel_ro)) == 0)
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{
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*plen = strlen(data_rel_ro);
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return data_rel_ro;
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}
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*plen = sdot - name;
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return name;
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}
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@ -433,16 +433,16 @@ class Layout
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Layout(const Layout&);
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Layout& operator=(const Layout&);
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// Mapping from .gnu.linkonce section names to output section names.
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struct Linkonce_mapping
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// Mapping from input section names to output section names.
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struct Section_name_mapping
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{
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const char* from;
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int fromlen;
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const char* to;
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int tolen;
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};
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static const Linkonce_mapping linkonce_mapping[];
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static const int linkonce_mapping_count;
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static const Section_name_mapping section_name_mapping[];
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static const int section_name_mapping_count;
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// During a relocatable link, a list of group sections and
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// signatures.
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@ -556,11 +556,6 @@ class Layout
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static const char*
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output_section_name(const char* name, size_t* plen);
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// Return the output section name to use for a linkonce section
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// name. PLEN is as for output_section_name.
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static const char*
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linkonce_output_name(const char* name, size_t* plen);
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// Return the number of allocated output sections.
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size_t
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allocated_output_section_count() const;
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