@@ -18,6 +18,7 @@ along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include <sstream>
+#include <vector>
#define INCLUDE_STRING
#include "config.h"
@@ -122,6 +123,26 @@ const riscv_subset_list *riscv_current_subset_list ()
return current_subset_list;
}
+/* struct for recording multi-lib info. */
+struct riscv_multi_lib_info_t {
+ std::string path;
+ std::string arch_str;
+ std::string abi_str;
+ std::string other_cond;
+ riscv_subset_list *subset_list;
+
+ static bool parse (struct riscv_multi_lib_info_t *,
+ const std::string &,
+ const std::string &);
+};
+
+/* Flag for checking if there is no suitable multi-lib found. */
+static bool riscv_no_matched_multi_lib;
+
+/* Used for record value of -march and -mabi. */
+static std::string riscv_current_arch_str;
+static std::string riscv_current_abi_str;
+
riscv_subset_t::riscv_subset_t ()
: name (), major_version (0), minor_version (0), next (NULL),
explicit_version_p (false), implied_p (false)
@@ -147,6 +168,42 @@ riscv_subset_list::~riscv_subset_list ()
}
}
+/* Compute the match score of two arch string, return 0 if incompatible. */
+int
+riscv_subset_list::match_score (riscv_subset_list *list) const
+{
+ riscv_subset_t *s;
+ int score = 0;
+ bool has_a_ext, list_has_a_ext;
+
+ /* Impossible to match if XLEN is different. */
+ if (list->m_xlen != this->m_xlen)
+ return 0;
+
+ /* There is different code gen in libstdc++ and libatomic between w/ A-ext
+ and w/o A-ext, and it not work if using soft and hard atomic mechanism
+ at same time, so they are incompatible. */
+ has_a_ext = this->lookup ("a") != NULL;
+ list_has_a_ext = list->lookup ("a") != NULL;
+
+ if (has_a_ext != list_has_a_ext)
+ return 0;
+
+
+ /* list must be subset of current this list, otherwise it not safe to
+ link.
+ TODO: We might give different weigth for each extension, but the rule could
+ be complicated.
+ TODO: We might consider the version of each extension. */
+ for (s = list->m_head; s != NULL; s = s->next)
+ if (this->lookup (s->name.c_str ()) != NULL)
+ score++;
+ else
+ return 0;
+
+ return score;
+}
+
/* Get the rank for single-letter subsets, lower value meaning higher
priority. */
@@ -1054,6 +1111,358 @@ riscv_expand_arch_from_cpu (int argc ATTRIBUTE_UNUSED,
return xasprintf ("-march=%s", arch.c_str());
}
+/* Find last switch with the prefix, options are take last one in general,
+ return NULL if not found, and return the option value if found, it could
+ return empty string if the option has no value. */
+
+static const char *
+find_last_appear_switch (
+ const struct switchstr *switches,
+ int n_switches,
+ const char *prefix)
+{
+ int i;
+ size_t len = strlen (prefix);
+
+ for (i = 0; i < n_switches; ++i) {
+ const struct switchstr *this_switch = &switches[n_switches - i - 1];
+
+ if (this_switch->live_cond & SWITCH_FALSE)
+ continue;
+
+ if (strncmp (this_switch->part1, prefix, len) == 0)
+ return this_switch->part1 + len;
+ }
+
+ return NULL;
+}
+
+/* Parse the path and cond string into riscv_multi_lib_info_t, return false
+ if parsing failed. */
+
+bool
+riscv_multi_lib_info_t::parse (
+ struct riscv_multi_lib_info_t *multi_lib_info,
+ const std::string &path,
+ const std::string &cond)
+{
+ const char *default_arch_str = STRINGIZING (TARGET_RISCV_DEFAULT_ARCH);
+ const char *default_abi_str = STRINGIZING (TARGET_RISCV_DEFAULT_ABI);
+ multi_lib_info->other_cond = cond;
+ if (path == ".")
+ {
+ multi_lib_info->arch_str = default_arch_str;
+ multi_lib_info->abi_str = default_abi_str;
+ multi_lib_info->subset_list =
+ riscv_subset_list::parse(
+ STRINGIZING (TARGET_RISCV_DEFAULT_ARCH),
+ input_location);
+ }
+ else
+ {
+ /* XXX: Maybe we should parse that from cond string rather than path. */
+ /* The path rule for RISC-V multi-lib is <arch>/<abi>[/<others>]. */
+ size_t slash_pos = path.find ('/');
+
+ /* Parse failed if not found any `/`. */
+ if (slash_pos == std::string::npos)
+ return false;
+
+ /* Seeking if there is other part in the path. */
+ size_t end_of_abi = path.find ('/', slash_pos + 1);
+
+ multi_lib_info->arch_str = path.substr (0, slash_pos);
+ if (end_of_abi == std::string::npos) {
+ /* Only <arch>/<abi>. */
+ multi_lib_info->abi_str = path.substr (slash_pos + 1,
+ path.length () - 1);
+
+ /* Skip this multi-lib if this configuration is exactly same as
+ default multi-lib settings. */
+ if (multi_lib_info->arch_str == default_arch_str
+ && multi_lib_info->abi_str == default_abi_str)
+ return false;
+
+ } else
+ /* <arch>/<abi>/<others>.... */
+ multi_lib_info->abi_str = path.substr (slash_pos + 1,
+ end_of_abi - slash_pos - 1);
+ }
+
+ multi_lib_info->subset_list =
+ riscv_subset_list::parse(multi_lib_info->arch_str.c_str (), input_location);
+
+ return true;
+}
+
+/* Report error if not found suitable multilib. */
+const char *
+riscv_multi_lib_check (int argc ATTRIBUTE_UNUSED,
+ const char **argv ATTRIBUTE_UNUSED)
+{
+ if (riscv_no_matched_multi_lib)
+ fatal_error (
+ input_location,
+ "Can't found suitable multilib set for %<-march=%s%>/%<-mabi=%s%>",
+ riscv_current_arch_str.c_str (),
+ riscv_current_abi_str.c_str ());
+
+ return "";
+}
+
+static bool
+riscv_check_cond (
+ const struct switchstr *switches,
+ int n_switches,
+ const std::string &arg,
+ bool not_arg)
+{
+ int i;
+ for (i = 0; i < n_switches; ++i) {
+ const struct switchstr *this_switch = &switches[n_switches - i - 1];
+
+ if ((this_switch->live_cond & SWITCH_IGNORE) != 0)
+ continue;
+
+ if (this_switch->live_cond & SWITCH_FALSE)
+ continue;
+
+ if (arg == this_switch->part1)
+ return not_arg ? false : true;
+ }
+
+ /* Not found this arg, that's ok! */
+ return not_arg ? true : false;
+}
+
+/* Check the other cond is found or not, return */
+
+static int
+riscv_check_other_cond (
+ const struct switchstr *switches,
+ int n_switches,
+ int match_score,
+ const std::string &other_cond)
+{
+ const char *p = other_cond.c_str ();
+ const char *this_arg;
+ std::string arg;
+ bool not_arg;
+ bool ok;
+ int ok_count = 0;
+
+ if (match_score == 0)
+ return 0;
+
+ while (*p != '\0')
+ {
+ while (*p == ' ') p++;
+ this_arg = p;
+ while (*p != ' ' && *p != '\0')
+ ++p;
+
+ if (*this_arg != '!')
+ not_arg = false;
+ else
+ {
+ not_arg = true;
+ ++this_arg;
+ }
+
+ arg = std::string (this_arg, p - this_arg);
+
+ /* We might got empty arg when multi-lib is disabled. */
+ if (arg.empty ())
+ continue;
+
+ ok = riscv_check_cond (switches, n_switches, arg, not_arg);
+
+ if (!ok)
+ return -1;
+
+ ok_count++;
+
+ if (*p == '\0') break;
+
+ p++;
+ }
+
+ /* 100 is magic number, it's just used for make sure this multi-lib has
+ higher priority if we found any some option is listed in the option check
+ list. */
+ return match_score + ok_count * 100;
+}
+
+/* We only override this in bare-matel toolchain. */
+#ifdef RISCV_USE_CUSTOMISED_MULTI_LIB
+/* Implement TARGET_COMPUTE_MULTILIB. */
+
+static const char *
+riscv_compute_multilib (
+ const struct switchstr *switches,
+ int n_switches,
+ const char *multilib_dir,
+ const char *multilib_defaults ATTRIBUTE_UNUSED,
+ const char *multilib_select,
+ const char *multilib_matches ATTRIBUTE_UNUSED,
+ const char *multilib_exclusions ATTRIBUTE_UNUSED,
+ const char *multilib_reuse ATTRIBUTE_UNUSED)
+{
+ const char *p, *tp;
+ const char *this_path;
+ const char *this_cond;
+ size_t this_path_len;
+ size_t this_cond_len;
+ size_t offset;
+ bool skip_until_blank;
+ bool result;
+ riscv_no_matched_multi_lib = false;
+ riscv_subset_list *subset_list = NULL;
+
+ std::vector<riscv_multi_lib_info_t> multilib_infos;
+ riscv_multi_lib_info_t multilib_info;
+
+ /* Already found suitable, multi-lib, just use that. */
+ if (multilib_dir != NULL)
+ return multilib_dir;
+
+ /* Find last march. */
+ riscv_current_arch_str =
+ find_last_appear_switch (switches, n_switches, "march=");
+ /* Find mabi. */
+ riscv_current_abi_str =
+ find_last_appear_switch (switches, n_switches, "mabi=");
+
+ /* Failed to find -march or -mabi, but it should not happened since we have
+ set both in OPTION_DEFAULT_SPECS. */
+ if (riscv_current_arch_str.empty () || riscv_current_abi_str.empty ())
+ return multilib_dir;
+
+ subset_list = riscv_subset_list::parse (riscv_current_arch_str.c_str (),
+ input_location);
+
+ /* Failed to parse -march, fallback to using what gcc use. */
+ if (subset_list == NULL)
+ return multilib_dir;
+
+ /* Parsing MULTILIB_SELECT, ignore MULTILIB_REUSE here, we have our own rules.
+ TODO: most codes are grab from gcc.c, maybe we should refine that? */
+ p = multilib_select;
+
+ while (*p != '\0')
+ {
+ /* Ignore newlines. */
+ if (*p == '\n')
+ {
+ ++p;
+ continue;
+ }
+
+ /* Get the initial path. */
+ this_path = p;
+ while (*p != ' ')
+ {
+ if (*p == '\0')
+ {
+ fatal_error (input_location, "multilib select %qs %qs is invalid",
+ multilib_select, multilib_reuse);
+ }
+ ++p;
+ }
+ this_path_len = p - this_path;
+ multilib_info.path = std::string (this_path, this_path_len);
+
+ this_cond = p;
+ while (*p != ';')
+ {
+ if (*p == '\0')
+ {
+ fatal_error (input_location, "multilib select %qs %qs is invalid",
+ multilib_select, multilib_reuse);
+ }
+ ++p;
+ }
+
+ /* Ignore march or mabi option in cond string. */
+ tp = this_cond;
+ skip_until_blank = false;
+
+ while (*tp != ';')
+ {
+ offset = 0;
+ if (*tp == '!')
+ offset = 1;
+
+ if (skip_until_blank && *tp == ' ')
+ {
+ skip_until_blank = false;
+ this_cond = tp + 1;
+ }
+
+ if ((strncmp (tp + offset, "mabi", 4) == 0) ||
+ (strncmp (tp + offset, "march", 5) == 0))
+ skip_until_blank = true;
+
+ ++tp;
+ }
+
+ if (skip_until_blank)
+ this_cond_len = 0;
+ else
+ this_cond_len = p - this_cond;
+
+ result =
+ riscv_multi_lib_info_t::parse (
+ &multilib_info,
+ std::string (this_path, this_path_len),
+ std::string (this_cond, this_cond_len));
+
+ if (result)
+ multilib_infos.push_back (multilib_info);
+
+ p++;
+ }
+
+ int match_score = 0;
+ int max_match_score = 0;
+ int best_match_multi_lib = -1;
+ /* Try to decition which set we should used. */
+ /* We have 3 level dection tree here, ABI, A-ext, check input arch/ABI must be
+ superset of multi-lib arch. */
+ for (size_t i = 0; i < multilib_infos.size (); ++i)
+ {
+ /* Check ABI is same first. */
+ if (riscv_current_abi_str != multilib_infos[i].abi_str)
+ continue;
+
+ /* Found a potential compatible multi-lib setting!
+ Calculate the match score. */
+ match_score = subset_list->match_score (multilib_infos[i].subset_list);
+
+ /* Checking other cond in the multi-lib setting. */
+ match_score = riscv_check_other_cond (switches,
+ n_switches,
+ match_score,
+ multilib_infos[i].other_cond);
+
+ /* Record highest match score multi-lib setting. */
+ if (match_score > max_match_score)
+ best_match_multi_lib = i;
+ }
+
+ if (best_match_multi_lib == -1)
+ {
+ riscv_no_matched_multi_lib = true;
+ return multilib_dir;
+ }
+ else
+ return xstrdup (multilib_infos[best_match_multi_lib].path.c_str ());
+}
+
+#undef TARGET_COMPUTE_MULTILIB
+#define TARGET_COMPUTE_MULTILIB riscv_compute_multilib
+#endif
+
/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
static const struct default_options riscv_option_optimization_table[] =
@@ -27,10 +27,14 @@ along with GCC; see the file COPYING3. If not see
/* Link against Newlib libraries, because the ELF backend assumes Newlib.
Handle the circular dependence between libc and libgloss. */
#undef LIB_SPEC
-#define LIB_SPEC "--start-group -lc %{!specs=nosys.specs:-lgloss} --end-group"
+#define LIB_SPEC \
+ "--start-group -lc %{!specs=nosys.specs:-lgloss} --end-group " \
+ "%{!nostartfiles:%{!nodefaultlibs:%{!nolibc:%{!nostdlib:%:riscv_multi_lib_check()}}}}"
#undef STARTFILE_SPEC
#define STARTFILE_SPEC "crt0%O%s crtbegin%O%s"
#undef ENDFILE_SPEC
#define ENDFILE_SPEC "crtend%O%s"
+
+#define RISCV_USE_CUSTOMISED_MULTI_LIB 1
@@ -88,6 +88,8 @@ public:
const riscv_subset_t *begin () const {return m_head;};
const riscv_subset_t *end () const {return NULL;};
+
+ int match_score (riscv_subset_list *) const;
};
extern const riscv_subset_list *riscv_current_subset_list (void);
@@ -50,11 +50,13 @@ along with GCC; see the file COPYING3. If not see
extern const char *riscv_expand_arch (int argc, const char **argv);
extern const char *riscv_expand_arch_from_cpu (int argc, const char **argv);
extern const char *riscv_default_mtune (int argc, const char **argv);
+extern const char *riscv_multi_lib_check (int argc, const char **argv);
# define EXTRA_SPEC_FUNCTIONS \
{ "riscv_expand_arch", riscv_expand_arch }, \
{ "riscv_expand_arch_from_cpu", riscv_expand_arch_from_cpu }, \
- { "riscv_default_mtune", riscv_default_mtune },
+ { "riscv_default_mtune", riscv_default_mtune }, \
+ { "riscv_multi_lib_check", riscv_multi_lib_check },
/* Support for a compile-time default CPU, et cetera. The rules are:
--with-arch is ignored if -march or -mcpu is specified.