/* Top level of GCC compilers (cc1, cc1plus, etc.) Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. 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 2, 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 COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* This is the top level of cc1/c++. It parses command args, opens files, invokes the various passes in the proper order, and counts the time used by each. Error messages and low-level interface to malloc also handled here. */ #include "config.h" #undef FLOAT /* This is for hpux. They should change hpux. */ #undef FFS /* Some systems define this in param.h. */ #include "system.h" #include "coretypes.h" #include "tm.h" #include #ifdef HAVE_SYS_RESOURCE_H # include #endif #ifdef HAVE_SYS_TIMES_H # include #endif #include "line-map.h" #include "input.h" #include "tree.h" #include "version.h" #include "rtl.h" #include "tm_p.h" #include "flags.h" #include "insn-attr.h" #include "insn-config.h" #include "insn-flags.h" #include "hard-reg-set.h" #include "recog.h" #include "output.h" #include "except.h" #include "function.h" #include "toplev.h" #include "expr.h" #include "basic-block.h" #include "intl.h" #include "ggc.h" #include "graph.h" #include "loop.h" #include "regs.h" #include "timevar.h" #include "diagnostic.h" #include "params.h" #include "reload.h" #include "dwarf2asm.h" #include "integrate.h" #include "real.h" #include "debug.h" #include "target.h" #include "langhooks.h" #include "cfglayout.h" #include "cfgloop.h" #include "hosthooks.h" #include "cgraph.h" #include "opts.h" #include "coverage.h" #include "value-prof.h" #include "alloc-pool.h" #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO) #include "dwarf2out.h" #endif #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) #include "dbxout.h" #endif #ifdef SDB_DEBUGGING_INFO #include "sdbout.h" #endif #ifdef XCOFF_DEBUGGING_INFO #include "xcoffout.h" /* Needed for external data declarations for e.g. AIX 4.x. */ #endif static void general_init (const char *); static void do_compile (void); static void process_options (void); static void backend_init (void); static int lang_dependent_init (const char *); static void init_asm_output (const char *); static void finalize (void); static void crash_signal (int) ATTRIBUTE_NORETURN; static void setup_core_dumping (void); static void compile_file (void); static int print_single_switch (FILE *, int, int, const char *, const char *, const char *, const char *, const char *); static void print_switch_values (FILE *, int, int, const char *, const char *, const char *); /* Nonzero to dump debug info whilst parsing (-dy option). */ static int set_yydebug; /* True if we don't need a backend (e.g. preprocessing only). */ static bool no_backend; /* Length of line when printing switch values. */ #define MAX_LINE 75 /* Name of program invoked, sans directories. */ const char *progname; /* Copy of argument vector to toplev_main. */ static const char **save_argv; /* Name of top-level original source file (what was input to cpp). This comes from the #-command at the beginning of the actual input. If there isn't any there, then this is the cc1 input file name. */ const char *main_input_filename; #ifndef USE_MAPPED_LOCATION location_t unknown_location = { NULL, 0 }; #endif /* Used to enable -fvar-tracking, -fweb and -frename-registers according to optimize and default_debug_hooks in process_options (). */ #define AUTODETECT_FLAG_VAR_TRACKING 2 /* Current position in real source file. */ location_t input_location; struct line_maps line_table; /* Nonzero if it is unsafe to create any new pseudo registers. */ int no_new_pseudos; /* Stack of currently pending input files. */ struct file_stack *input_file_stack; /* Incremented on each change to input_file_stack. */ int input_file_stack_tick; /* Name to use as base of names for dump output files. */ const char *dump_base_name; /* Name to use as a base for auxiliary output files. */ const char *aux_base_name; /* Bit flags that specify the machine subtype we are compiling for. Bits are tested using macros TARGET_... defined in the tm.h file and set by `-m...' switches. Must be defined in rtlanal.c. */ extern int target_flags; /* A mask of target_flags that includes bit X if X was set or cleared on the command line. */ int target_flags_explicit; /* Debug hooks - dependent upon command line options. */ const struct gcc_debug_hooks *debug_hooks; /* Debug hooks - target default. */ static const struct gcc_debug_hooks *default_debug_hooks; /* Other flags saying which kinds of debugging dump have been requested. */ int rtl_dump_and_exit; int flag_print_asm_name; enum graph_dump_types graph_dump_format; /* Name for output file of assembly code, specified with -o. */ const char *asm_file_name; /* Nonzero means do optimizations. -O. Particular numeric values stand for particular amounts of optimization; thus, -O2 stores 2 here. However, the optimizations beyond the basic ones are not controlled directly by this variable. Instead, they are controlled by individual `flag_...' variables that are defaulted based on this variable. */ int optimize = 0; /* Nonzero means optimize for size. -Os. The only valid values are zero and nonzero. When optimize_size is nonzero, optimize defaults to 2, but certain individual code bloating optimizations are disabled. */ int optimize_size = 0; /* The FUNCTION_DECL for the function currently being compiled, or 0 if between functions. */ tree current_function_decl; /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE if none. */ tree current_function_func_begin_label; /* Temporarily suppress certain warnings. This is set while reading code from a system header file. */ int in_system_header = 0; /* Nonzero means to collect statistics which might be expensive and to print them when we are done. */ int flag_detailed_statistics = 0; /* A random sequence of characters, unless overridden by user. */ const char *flag_random_seed; /* A local time stamp derived from the time of compilation. It will be zero if the system cannot provide a time. It will be -1u, if the user has specified a particular random seed. */ unsigned local_tick; /* -f flags. */ /* Nonzero means `char' should be signed. */ int flag_signed_char; /* Nonzero means give an enum type only as many bytes as it needs. A value of 2 means it has not yet been initialized. */ int flag_short_enums; /* Nonzero if structures and unions should be returned in memory. This should only be defined if compatibility with another compiler or with an ABI is needed, because it results in slower code. */ #ifndef DEFAULT_PCC_STRUCT_RETURN #define DEFAULT_PCC_STRUCT_RETURN 1 #endif /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN; /* 0 means straightforward implementation of complex divide acceptable. 1 means wide ranges of inputs must work for complex divide. 2 means C99-like requirements for complex divide (not yet implemented). */ int flag_complex_divide_method = 0; /* Nonzero means performs web construction pass. When flag_web == AUTODETECT_FLAG_VAR_TRACKING it will be set according to optimize and default_debug_hooks in process_options (). */ int flag_web = AUTODETECT_FLAG_VAR_TRACKING; /* Nonzero means that we don't want inlining by virtue of -fno-inline, not just because the tree inliner turned us off. */ int flag_really_no_inline = 2; /* Nonzero means we should be saving declaration info into a .X file. */ int flag_gen_aux_info = 0; /* Specified name of aux-info file. */ const char *aux_info_file_name; /* Nonzero if we are compiling code for a shared library, zero for executable. */ int flag_shlib; /* Set to the default thread-local storage (tls) model to use. */ enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC; /* Nonzero means change certain warnings into errors. Usually these are warnings about failure to conform to some standard. */ int flag_pedantic_errors = 0; /* -dA causes debug commentary information to be produced in the generated assembly code (to make it more readable). This option is generally only of use to those who actually need to read the generated assembly code (perhaps while debugging the compiler itself). Currently, this switch is only used by dwarfout.c; however, it is intended to be a catchall for printing debug information in the assembler file. */ int flag_debug_asm = 0; /* -dP causes the rtl to be emitted as a comment in assembly. */ int flag_dump_rtl_in_asm = 0; /* When non-NULL, indicates that whenever space is allocated on the stack, the resulting stack pointer must not pass this address---that is, for stacks that grow downward, the stack pointer must always be greater than or equal to this address; for stacks that grow upward, the stack pointer must be less than this address. At present, the rtx may be either a REG or a SYMBOL_REF, although the support provided depends on the backend. */ rtx stack_limit_rtx; /* If one, renumber instruction UIDs to reduce the number of unused UIDs if there are a lot of instructions. If greater than one, unconditionally renumber instruction UIDs. */ int flag_renumber_insns = 1; /* Nonzero if we should track variables. When flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING it will be set according to optimize, debug_info_level and debug_hooks in process_options (). */ int flag_var_tracking = AUTODETECT_FLAG_VAR_TRACKING; /* True if the user has tagged the function with the 'section' attribute. */ bool user_defined_section_attribute = false; /* Values of the -falign-* flags: how much to align labels in code. 0 means `use default', 1 means `don't align'. For each variable, there is an _log variant which is the power of two not less than the variable, for .align output. */ int align_loops_log; int align_loops_max_skip; int align_jumps_log; int align_jumps_max_skip; int align_labels_log; int align_labels_max_skip; int align_functions_log; /* Like align_functions_log above, but used by front-ends to force the minimum function alignment. Zero means no alignment is forced. */ int force_align_functions_log; typedef struct { const char *const string; int *const variable; const int on_value; } lang_independent_options; /* Nonzero if subexpressions must be evaluated from left-to-right. */ int flag_evaluation_order = 0; /* The user symbol prefix after having resolved same. */ const char *user_label_prefix; static const param_info lang_independent_params[] = { #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \ { OPTION, DEFAULT, HELP }, #include "params.def" #undef DEFPARAM { NULL, 0, NULL } }; /* Here is a table, controlled by the tm.h file, listing each -m switch and which bits in `target_switches' it should set or clear. If VALUE is positive, it is bits to set. If VALUE is negative, -VALUE is bits to clear. (The sign bit is not used so there is no confusion.) */ static const struct { const char *const name; const int value; const char *const description; } target_switches[] = TARGET_SWITCHES; /* This table is similar, but allows the switch to have a value. */ #ifdef TARGET_OPTIONS static const struct { const char *const prefix; const char **const variable; const char *const description; const char *const value; } target_options[] = TARGET_OPTIONS; #endif /* Nonzero means warn about function definitions that default the return type or that use a null return and have a return-type other than void. */ int warn_return_type; /* Output files for assembler code (real compiler output) and debugging dumps. */ FILE *asm_out_file; FILE *aux_info_file; FILE *dump_file = NULL; FILE *cgraph_dump_file = NULL; char *dump_file_name; /* The current working directory of a translation. It's generally the directory from which compilation was initiated, but a preprocessed file may specify the original directory in which it was created. */ static const char *src_pwd; /* Initialize src_pwd with the given string, and return true. If it was already initialized, return false. As a special case, it may be called with a NULL argument to test whether src_pwd has NOT been initialized yet. */ bool set_src_pwd (const char *pwd) { if (src_pwd) { if (strcmp (src_pwd, pwd) == 0) return true; else return false; } src_pwd = xstrdup (pwd); return true; } /* Return the directory from which the translation unit was initiated, in case set_src_pwd() was not called before to assign it a different value. */ const char * get_src_pwd (void) { if (! src_pwd) src_pwd = getpwd (); return src_pwd; } /* Called when the start of a function definition is parsed, this function prints on stderr the name of the function. */ void announce_function (tree decl) { if (!quiet_flag) { if (rtl_dump_and_exit) verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl))); else verbatim (" %s", lang_hooks.decl_printable_name (decl, 2)); fflush (stderr); pp_needs_newline (global_dc->printer) = true; diagnostic_set_last_function (global_dc); } } /* Set up a default flag_random_seed and local_tick, unless the user already specified one. */ static void randomize (void) { if (!flag_random_seed) { unsigned HOST_WIDE_INT value; static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3]; /* Get some more or less random data. */ #ifdef HAVE_GETTIMEOFDAY { struct timeval tv; gettimeofday (&tv, NULL); local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000; } #else { time_t now = time (NULL); if (now != (time_t)-1) local_tick = (unsigned) now; } #endif value = local_tick ^ getpid (); sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value); flag_random_seed = random_seed; } else if (!local_tick) local_tick = -1; } /* Decode the string P as an integral parameter. If the string is indeed an integer return its numeric value else issue an Invalid Option error for the option PNAME and return DEFVAL. If PNAME is zero just return DEFVAL, do not call error. */ int read_integral_parameter (const char *p, const char *pname, const int defval) { const char *endp = p; while (*endp) { if (ISDIGIT (*endp)) endp++; else break; } if (*endp != 0) { if (pname != 0) error ("invalid option argument `%s'", pname); return defval; } return atoi (p); } /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X. If X is 0, return -1. This should be used via the floor_log2 macro. */ int floor_log2_wide (unsigned HOST_WIDE_INT x) { int t=0; if (x == 0) return -1; if (sizeof (HOST_WIDE_INT) * 8 > 64) if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64)) t += 64; if (sizeof (HOST_WIDE_INT) * 8 > 32) if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32)) t += 32; if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16)) t += 16; if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8)) t += 8; if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4)) t += 4; if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2)) t += 2; if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1)) t += 1; return t; } /* Return the logarithm of X, base 2, considering X unsigned, if X is a power of 2. Otherwise, returns -1. This should be used via the `exact_log2' macro. */ int exact_log2_wide (unsigned HOST_WIDE_INT x) { /* Test for 0 or a power of 2. */ if (x == 0 || x != (x & -x)) return -1; return floor_log2_wide (x); } /* Handler for fatal signals, such as SIGSEGV. These are transformed into ICE messages, which is much more user friendly. In case the error printer crashes, reset the signal to prevent infinite recursion. */ static void crash_signal (int signo) { signal (signo, SIG_DFL); /* If we crashed while processing an ASM statement, then be a little more graceful. It's most likely the user's fault. */ if (this_is_asm_operands) { output_operand_lossage ("unrecoverable error"); exit (FATAL_EXIT_CODE); } internal_error ("%s", strsignal (signo)); } /* Arrange to dump core on error. (The regular error message is still printed first, except in the case of abort().) */ static void setup_core_dumping (void) { #ifdef SIGABRT signal (SIGABRT, SIG_DFL); #endif #if defined(HAVE_SETRLIMIT) { struct rlimit rlim; if (getrlimit (RLIMIT_CORE, &rlim) != 0) fatal_error ("getting core file size maximum limit: %m"); rlim.rlim_cur = rlim.rlim_max; if (setrlimit (RLIMIT_CORE, &rlim) != 0) fatal_error ("setting core file size limit to maximum: %m"); } #endif diagnostic_abort_on_error (global_dc); } /* Strip off a legitimate source ending from the input string NAME of length LEN. Rather than having to know the names used by all of our front ends, we strip off an ending of a period followed by up to five characters. (Java uses ".class".) */ void strip_off_ending (char *name, int len) { int i; for (i = 2; i < 6 && len > i; i++) { if (name[len - i] == '.') { name[len - i] = '\0'; break; } } } /* Output a quoted string. */ void output_quoted_string (FILE *asm_file, const char *string) { #ifdef OUTPUT_QUOTED_STRING OUTPUT_QUOTED_STRING (asm_file, string); #else char c; putc ('\"', asm_file); while ((c = *string++) != 0) { if (ISPRINT (c)) { if (c == '\"' || c == '\\') putc ('\\', asm_file); putc (c, asm_file); } else fprintf (asm_file, "\\%03o", (unsigned char) c); } putc ('\"', asm_file); #endif } /* Output a file name in the form wanted by System V. */ void output_file_directive (FILE *asm_file, const char *input_name) { int len; const char *na; if (input_name == NULL) input_name = ""; len = strlen (input_name); na = input_name + len; /* NA gets INPUT_NAME sans directory names. */ while (na > input_name) { if (IS_DIR_SEPARATOR (na[-1])) break; na--; } #ifdef ASM_OUTPUT_SOURCE_FILENAME ASM_OUTPUT_SOURCE_FILENAME (asm_file, na); #else fprintf (asm_file, "\t.file\t"); output_quoted_string (asm_file, na); fputc ('\n', asm_file); #endif } /* Do any final processing required for the declarations in VEC, of which there are LEN. We write out inline functions and variables that have been deferred until this point, but which are required. Returns nonzero if anything was put out. */ int wrapup_global_declarations (tree *vec, int len) { tree decl; int i; int reconsider; int output_something = 0; for (i = 0; i < len; i++) { decl = vec[i]; /* We're not deferring this any longer. Assignment is conditional to avoid needlessly dirtying PCH pages. */ if (DECL_DEFER_OUTPUT (decl) != 0) DECL_DEFER_OUTPUT (decl) = 0; if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0) lang_hooks.finish_incomplete_decl (decl); } /* Now emit any global variables or functions that we have been putting off. We need to loop in case one of the things emitted here references another one which comes earlier in the list. */ do { reconsider = 0; for (i = 0; i < len; i++) { decl = vec[i]; if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)) continue; /* Don't write out static consts, unless we still need them. We also keep static consts if not optimizing (for debugging), unless the user specified -fno-keep-static-consts. ??? They might be better written into the debug information. This is possible when using DWARF. A language processor that wants static constants to be always written out (even if it is not used) is responsible for calling rest_of_decl_compilation itself. E.g. the C front-end calls rest_of_decl_compilation from finish_decl. One motivation for this is that is conventional in some environments to write things like: static const char rcsid[] = "... version string ..."; intending to force the string to be in the executable. A language processor that would prefer to have unneeded static constants "optimized away" would just defer writing them out until here. E.g. C++ does this, because static constants are often defined in header files. ??? A tempting alternative (for both C and C++) would be to force a constant to be written if and only if it is defined in a main file, as opposed to an include file. */ if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)) { struct cgraph_varpool_node *node; bool needed = 1; node = cgraph_varpool_node (decl); if (flag_unit_at_a_time && node->finalized) needed = 0; else if ((flag_unit_at_a_time && !cgraph_global_info_ready) && (TREE_USED (decl) || TREE_USED (DECL_ASSEMBLER_NAME (decl)))) /* needed */; else if (node->needed) /* needed */; else if (DECL_COMDAT (decl)) needed = 0; else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl) && (optimize || !flag_keep_static_consts || DECL_ARTIFICIAL (decl))) needed = 0; if (needed) { reconsider = 1; rest_of_decl_compilation (decl, 1, 1); } } } if (reconsider) output_something = 1; } while (reconsider); return output_something; } /* Issue appropriate warnings for the global declarations in VEC (of which there are LEN). Output debugging information for them. */ void check_global_declarations (tree *vec, int len) { tree decl; int i; for (i = 0; i < len; i++) { decl = vec[i]; if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl) && ! TREE_ASM_WRITTEN (decl)) /* Cancel the RTL for this decl so that, if debugging info output for global variables is still to come, this one will be omitted. */ SET_DECL_RTL (decl, NULL_RTX); /* Warn about any function declared static but not defined. We don't warn about variables, because many programs have static variables that exist only to get some text into the object file. */ if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl) == 0 && DECL_EXTERNAL (decl) && ! DECL_ARTIFICIAL (decl) && ! TREE_NO_WARNING (decl) && ! TREE_PUBLIC (decl) && (warn_unused_function || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))) { if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) pedwarn ("%J'%F' used but never defined", decl, decl); else warning ("%J'%F' declared `static' but never defined", decl, decl); /* This symbol is effectively an "extern" declaration now. */ TREE_PUBLIC (decl) = 1; assemble_external (decl); } /* Warn about static fns or vars defined but not used. */ if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL) /* We don't warn about "static const" variables because the "rcs_id" idiom uses that construction. */ || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl))) && ! DECL_IN_SYSTEM_HEADER (decl) && ! TREE_USED (decl) /* The TREE_USED bit for file-scope decls is kept in the identifier, to handle multiple external decls in different scopes. */ && ! TREE_USED (DECL_NAME (decl)) && ! DECL_EXTERNAL (decl) && ! TREE_PUBLIC (decl) /* A volatile variable might be used in some non-obvious way. */ && ! TREE_THIS_VOLATILE (decl) /* Global register variables must be declared to reserve them. */ && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl)) /* Otherwise, ask the language. */ && lang_hooks.decls.warn_unused_global (decl)) warning ("%J'%D' defined but not used", decl, decl); /* Avoid confusing the debug information machinery when there are errors. */ if (errorcount == 0 && sorrycount == 0) { timevar_push (TV_SYMOUT); (*debug_hooks->global_decl) (decl); timevar_pop (TV_SYMOUT); } } } /* Warn about a use of an identifier which was marked deprecated. */ void warn_deprecated_use (tree node) { if (node == 0 || !warn_deprecated_decl) return; if (DECL_P (node)) { expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node)); warning ("`%s' is deprecated (declared at %s:%d)", IDENTIFIER_POINTER (DECL_NAME (node)), xloc.file, xloc.line); } else if (TYPE_P (node)) { const char *what = NULL; tree decl = TYPE_STUB_DECL (node); if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE) what = IDENTIFIER_POINTER (TYPE_NAME (node)); else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL && DECL_NAME (TYPE_NAME (node))) what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node))); if (decl) { expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (decl)); if (what) warning ("`%s' is deprecated (declared at %s:%d)", what, xloc.file, xloc.line); else warning ("type is deprecated (declared at %s:%d)", xloc.file, xloc.line); } else { if (what) warning ("type is deprecated"); else warning ("`%s' is deprecated", what); } } } /* Save the current INPUT_LOCATION on the top entry in the INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the INPUT_LOCATION accordingly. */ void #ifdef USE_MAPPED_LOCATION push_srcloc (location_t fline) #else push_srcloc (const char *file, int line) #endif { struct file_stack *fs; fs = xmalloc (sizeof (struct file_stack)); fs->location = input_location; fs->next = input_file_stack; #ifdef USE_MAPPED_LOCATION input_location = fline; #else input_filename = file; input_line = line; #endif input_file_stack = fs; input_file_stack_tick++; } /* Pop the top entry off the stack of presently open source files. Restore the INPUT_LOCATION from the new topmost entry on the stack. */ void pop_srcloc (void) { struct file_stack *fs; fs = input_file_stack; input_location = fs->location; input_file_stack = fs->next; free (fs); input_file_stack_tick++; } /* Compile an entire translation unit. Write a file of assembly output and various debugging dumps. */ static void compile_file (void) { /* Initialize yet another pass. */ init_final (main_input_filename); coverage_init (aux_base_name); timevar_push (TV_PARSE); /* Call the parser, which parses the entire file (calling rest_of_compilation for each function). */ lang_hooks.parse_file (set_yydebug); /* In case there were missing block closers, get us back to the global binding level. */ lang_hooks.clear_binding_stack (); /* Compilation is now finished except for writing what's left of the symbol table output. */ timevar_pop (TV_PARSE); if (flag_syntax_only) return; lang_hooks.decls.final_write_globals (); cgraph_varpool_assemble_pending_decls (); /* This must occur after the loop to output deferred functions. Else the coverage initializer would not be emitted if all the functions in this compilation unit were deferred. */ coverage_finish (); /* Write out any pending weak symbol declarations. */ weak_finish (); /* Do dbx symbols. */ timevar_push (TV_SYMOUT); #ifdef DWARF2_UNWIND_INFO if (dwarf2out_do_frame ()) dwarf2out_frame_finish (); #endif (*debug_hooks->finish) (main_input_filename); timevar_pop (TV_SYMOUT); /* Output some stuff at end of file if nec. */ dw2_output_indirect_constants (); /* Attach a special .ident directive to the end of the file to identify the version of GCC which compiled this code. The format of the .ident string is patterned after the ones produced by native SVR4 compilers. */ #ifdef IDENT_ASM_OP if (!flag_no_ident) fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n", IDENT_ASM_OP, version_string); #endif /* This must be at the end. Some target ports emit end of file directives into the assembly file here, and hence we can not output anything to the assembly file after this point. */ targetm.asm_out.file_end (); } /* Display help for target options. */ void display_target_options (void) { int undoc, i; static bool displayed = false; /* Avoid double printing for --help --target-help. */ if (displayed) return; displayed = true; if (ARRAY_SIZE (target_switches) > 1 #ifdef TARGET_OPTIONS || ARRAY_SIZE (target_options) > 1 #endif ) { int doc = 0; undoc = 0; printf (_("\nTarget specific options:\n")); for (i = ARRAY_SIZE (target_switches); i--;) { const char *option = target_switches[i].name; const char *description = target_switches[i].description; if (option == NULL || *option == 0) continue; else if (description == NULL) { undoc = 1; if (extra_warnings) printf (_(" -m%-23s [undocumented]\n"), option); } else if (*description != 0) doc += printf (" -m%-23s %s\n", option, _(description)); } #ifdef TARGET_OPTIONS for (i = ARRAY_SIZE (target_options); i--;) { const char *option = target_options[i].prefix; const char *description = target_options[i].description; if (option == NULL || *option == 0) continue; else if (description == NULL) { undoc = 1; if (extra_warnings) printf (_(" -m%-23s [undocumented]\n"), option); } else if (*description != 0) doc += printf (" -m%-23s %s\n", option, _(description)); } #endif if (undoc) { if (doc) printf (_("\nThere are undocumented target specific options as well.\n")); else printf (_(" They exist, but they are not documented.\n")); } } } /* Parse a -d... command line switch. */ void decode_d_option (const char *arg) { int c; while (*arg) switch (c = *arg++) { case 'A': flag_debug_asm = 1; break; case 'p': flag_print_asm_name = 1; break; case 'P': flag_dump_rtl_in_asm = 1; flag_print_asm_name = 1; break; case 'v': graph_dump_format = vcg; break; case 'x': rtl_dump_and_exit = 1; break; case 'y': set_yydebug = 1; break; case 'D': /* These are handled by the preprocessor. */ case 'I': break; case 'H': setup_core_dumping(); break; case 'a': default: if (!enable_rtl_dump_file (c)) warning ("unrecognized gcc debugging option: %c", c); break; } } /* Indexed by enum debug_info_type. */ const char *const debug_type_names[] = { "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms" }; /* Decode -m switches. */ /* Decode the switch -mNAME. */ void set_target_switch (const char *name) { size_t j; int valid_target_option = 0; for (j = 0; j < ARRAY_SIZE (target_switches); j++) if (!strcmp (target_switches[j].name, name)) { if (target_switches[j].value < 0) target_flags &= ~-target_switches[j].value; else target_flags |= target_switches[j].value; if (name[0] != 0) { if (target_switches[j].value < 0) target_flags_explicit |= -target_switches[j].value; else target_flags_explicit |= target_switches[j].value; } valid_target_option = 1; } #ifdef TARGET_OPTIONS if (!valid_target_option) for (j = 0; j < ARRAY_SIZE (target_options); j++) { int len = strlen (target_options[j].prefix); if (target_options[j].value) { if (!strcmp (target_options[j].prefix, name)) { *target_options[j].variable = target_options[j].value; valid_target_option = 1; } } else { if (!strncmp (target_options[j].prefix, name, len)) { *target_options[j].variable = name + len; valid_target_option = 1; } } } #endif if (!valid_target_option) error ("invalid option `%s'", name); } /* Print version information to FILE. Each line begins with INDENT (for the case where FILE is the assembler output file). */ void print_version (FILE *file, const char *indent) { #ifndef __VERSION__ #define __VERSION__ "[?]" #endif fnotice (file, #ifdef __GNUC__ "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n" #else "%s%s%s version %s (%s) compiled by CC.\n" #endif , indent, *indent != 0 ? " " : "", lang_hooks.name, version_string, TARGET_NAME, indent, __VERSION__); fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n", indent, *indent != 0 ? " " : "", PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE)); } /* Print an option value and return the adjusted position in the line. ??? We don't handle error returns from fprintf (disk full); presumably other code will catch a disk full though. */ static int print_single_switch (FILE *file, int pos, int max, const char *indent, const char *sep, const char *term, const char *type, const char *name) { /* The ultrix fprintf returns 0 on success, so compute the result we want here since we need it for the following test. */ int len = strlen (sep) + strlen (type) + strlen (name); if (pos != 0 && pos + len > max) { fprintf (file, "%s", term); pos = 0; } if (pos == 0) { fprintf (file, "%s", indent); pos = strlen (indent); } fprintf (file, "%s%s%s", sep, type, name); pos += len; return pos; } /* Print active target switches to FILE. POS is the current cursor position and MAX is the size of a "line". Each line begins with INDENT and ends with TERM. Each switch is separated from the next by SEP. */ static void print_switch_values (FILE *file, int pos, int max, const char *indent, const char *sep, const char *term) { size_t j; const char **p; /* Fill in the -frandom-seed option, if the user didn't pass it, so that it can be printed below. This helps reproducibility. */ randomize (); /* Print the options as passed. */ pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term, _("options passed: "), ""); for (p = &save_argv[1]; *p != NULL; p++) if (**p == '-') { /* Ignore these. */ if (strcmp (*p, "-o") == 0) { if (p[1] != NULL) p++; continue; } if (strcmp (*p, "-quiet") == 0) continue; if (strcmp (*p, "-version") == 0) continue; if ((*p)[1] == 'd') continue; pos = print_single_switch (file, pos, max, indent, sep, term, *p, ""); } if (pos > 0) fprintf (file, "%s", term); /* Print the -f and -m options that have been enabled. We don't handle language specific options but printing argv should suffice. */ pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term, _("options enabled: "), ""); for (j = 0; j < cl_options_count; j++) { if (!cl_options[j].flag_var || !(cl_options[j].flags & CL_REPORT)) continue; if (cl_options[j].has_set_value) { if (*cl_options[j].flag_var != cl_options[j].set_value) continue; } else { if (!*cl_options[j].flag_var) continue; } pos = print_single_switch (file, pos, max, indent, sep, term, "", cl_options[j].opt_text); } /* Print target specific options. */ for (j = 0; j < ARRAY_SIZE (target_switches); j++) if (target_switches[j].name[0] != '\0' && target_switches[j].value > 0 && ((target_switches[j].value & target_flags) == target_switches[j].value)) { pos = print_single_switch (file, pos, max, indent, sep, term, "-m", target_switches[j].name); } #ifdef TARGET_OPTIONS for (j = 0; j < ARRAY_SIZE (target_options); j++) if (*target_options[j].variable != NULL) { char prefix[256]; sprintf (prefix, "-m%s", target_options[j].prefix); pos = print_single_switch (file, pos, max, indent, sep, term, prefix, *target_options[j].variable); } #endif fprintf (file, "%s", term); } /* Open assembly code output file. Do this even if -fsyntax-only is on, because then the driver will have provided the name of a temporary file or bit bucket for us. NAME is the file specified on the command line, possibly NULL. */ static void init_asm_output (const char *name) { if (name == NULL && asm_file_name == 0) asm_out_file = stdout; else { if (asm_file_name == 0) { int len = strlen (dump_base_name); char *dumpname = xmalloc (len + 6); memcpy (dumpname, dump_base_name, len + 1); strip_off_ending (dumpname, len); strcat (dumpname, ".s"); asm_file_name = dumpname; } if (!strcmp (asm_file_name, "-")) asm_out_file = stdout; else asm_out_file = fopen (asm_file_name, "w+b"); if (asm_out_file == 0) fatal_error ("can't open %s for writing: %m", asm_file_name); } #ifdef IO_BUFFER_SIZE setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE), _IOFBF, IO_BUFFER_SIZE); #endif if (!flag_syntax_only) { targetm.asm_out.file_start (); #ifdef ASM_COMMENT_START if (flag_verbose_asm) { /* Print the list of options in effect. */ print_version (asm_out_file, ASM_COMMENT_START); print_switch_values (asm_out_file, 0, MAX_LINE, ASM_COMMENT_START, " ", "\n"); /* Add a blank line here so it appears in assembler output but not screen output. */ fprintf (asm_out_file, "\n"); } #endif } } /* Default version of get_pch_validity. By default, every flag difference is fatal; that will be mostly right for most targets, but completely right for very few. */ void * default_get_pch_validity (size_t *len) { #ifdef TARGET_OPTIONS size_t i; #endif char *result, *r; *len = sizeof (target_flags) + 2; #ifdef TARGET_OPTIONS for (i = 0; i < ARRAY_SIZE (target_options); i++) { *len += 1; if (*target_options[i].variable) *len += strlen (*target_options[i].variable); } #endif result = r = xmalloc (*len); r[0] = flag_pic; r[1] = flag_pie; r += 2; memcpy (r, &target_flags, sizeof (target_flags)); r += sizeof (target_flags); #ifdef TARGET_OPTIONS for (i = 0; i < ARRAY_SIZE (target_options); i++) { const char *str = *target_options[i].variable; size_t l; if (! str) str = ""; l = strlen (str) + 1; memcpy (r, str, l); r += l; } #endif return result; } /* Default version of pch_valid_p. */ const char * default_pch_valid_p (const void *data_p, size_t len) { const char *data = (const char *)data_p; const char *flag_that_differs = NULL; size_t i; /* -fpic and -fpie also usually make a PCH invalid. */ if (data[0] != flag_pic) return _("created and used with different settings of -fpic"); if (data[1] != flag_pie) return _("created and used with different settings of -fpie"); data += 2; /* Check target_flags. */ if (memcmp (data, &target_flags, sizeof (target_flags)) != 0) { for (i = 0; i < ARRAY_SIZE (target_switches); i++) { int bits; int tf; memcpy (&tf, data, sizeof (target_flags)); bits = target_switches[i].value; if (bits < 0) bits = -bits; if ((target_flags & bits) != (tf & bits)) { flag_that_differs = target_switches[i].name; goto make_message; } } gcc_unreachable (); } data += sizeof (target_flags); len -= sizeof (target_flags); /* Check string options. */ #ifdef TARGET_OPTIONS for (i = 0; i < ARRAY_SIZE (target_options); i++) { const char *str = *target_options[i].variable; size_t l; if (! str) str = ""; l = strlen (str) + 1; if (len < l || memcmp (data, str, l) != 0) { flag_that_differs = target_options[i].prefix; goto make_message; } data += l; len -= l; } #endif return NULL; make_message: { char *r; asprintf (&r, _("created and used with differing settings of `-m%s'"), flag_that_differs); if (r == NULL) return _("out of memory"); return r; } } /* Default tree printer. Handles declarations only. */ static bool default_tree_printer (pretty_printer * pp, text_info *text) { switch (*text->format_spec) { case 'D': case 'F': case 'T': { tree t = va_arg (*text->args_ptr, tree); const char *n = DECL_NAME (t) ? lang_hooks.decl_printable_name (t, 2) : ""; pp_string (pp, n); } return true; default: return false; } } /* Initialization of the front end environment, before command line options are parsed. Signal handlers, internationalization etc. ARGV0 is main's argv[0]. */ static void general_init (const char *argv0) { const char *p; p = argv0 + strlen (argv0); while (p != argv0 && !IS_DIR_SEPARATOR (p[-1])) --p; progname = p; xmalloc_set_program_name (progname); hex_init (); gcc_init_libintl (); /* Initialize the diagnostics reporting machinery, so option parsing can give warnings and errors. */ diagnostic_initialize (global_dc); /* Set a default printer. Language specific initializations will override it later. */ pp_format_decoder (global_dc->printer) = &default_tree_printer; /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */ #ifdef SIGSEGV signal (SIGSEGV, crash_signal); #endif #ifdef SIGILL signal (SIGILL, crash_signal); #endif #ifdef SIGBUS signal (SIGBUS, crash_signal); #endif #ifdef SIGABRT signal (SIGABRT, crash_signal); #endif #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT) signal (SIGIOT, crash_signal); #endif #ifdef SIGFPE signal (SIGFPE, crash_signal); #endif /* Other host-specific signal setup. */ (*host_hooks.extra_signals)(); /* Initialize the garbage-collector, string pools and tree type hash table. */ init_ggc (); init_stringpool (); linemap_init (&line_table); init_ttree (); /* Initialize register usage now so switches may override. */ init_reg_sets (); /* Register the language-independent parameters. */ add_params (lang_independent_params, LAST_PARAM); /* This must be done after add_params but before argument processing. */ init_ggc_heuristics(); init_tree_optimization_passes (); } /* Process the options that have been parsed. */ static void process_options (void) { /* Allow the front end to perform consistency checks and do further initialization based on the command line options. This hook also sets the original filename if appropriate (e.g. foo.i -> foo.c) so we can correctly initialize debug output. */ no_backend = lang_hooks.post_options (&main_input_filename); #ifndef USE_MAPPED_LOCATION input_filename = main_input_filename; #endif #ifdef OVERRIDE_OPTIONS /* Some machines may reject certain combinations of options. */ OVERRIDE_OPTIONS; #endif if (flag_short_enums == 2) flag_short_enums = targetm.default_short_enums (); /* Set aux_base_name if not already set. */ if (aux_base_name) ; else if (main_input_filename) { char *name = xstrdup (lbasename (main_input_filename)); strip_off_ending (name, strlen (name)); aux_base_name = name; } else aux_base_name = "gccaux"; /* Set up the align_*_log variables, defaulting them to 1 if they were still unset. */ if (align_loops <= 0) align_loops = 1; if (align_loops_max_skip > align_loops || !align_loops) align_loops_max_skip = align_loops - 1; align_loops_log = floor_log2 (align_loops * 2 - 1); if (align_jumps <= 0) align_jumps = 1; if (align_jumps_max_skip > align_jumps || !align_jumps) align_jumps_max_skip = align_jumps - 1; align_jumps_log = floor_log2 (align_jumps * 2 - 1); if (align_labels <= 0) align_labels = 1; align_labels_log = floor_log2 (align_labels * 2 - 1); if (align_labels_max_skip > align_labels || !align_labels) align_labels_max_skip = align_labels - 1; if (align_functions <= 0) align_functions = 1; align_functions_log = floor_log2 (align_functions * 2 - 1); /* Unrolling all loops implies that standard loop unrolling must also be done. */ if (flag_unroll_all_loops) flag_unroll_loops = 1; if (flag_unroll_loops) { flag_old_unroll_loops = 0; flag_old_unroll_all_loops = 0; } if (flag_old_unroll_all_loops) flag_old_unroll_loops = 1; /* Old loop unrolling requires that strength_reduction be on also. Silently turn on strength reduction here if it isn't already on. Also, the loop unrolling code assumes that cse will be run after loop, so that must be turned on also. */ if (flag_old_unroll_loops) { flag_strength_reduce = 1; flag_rerun_cse_after_loop = 1; } if (flag_unroll_loops || flag_peel_loops) flag_rerun_cse_after_loop = 1; /* If explicitly asked to run new loop optimizer, switch off the old one. */ if (flag_loop_optimize2) flag_loop_optimize = 0; /* Enable new loop optimizer pass if any of its optimizations is called. */ if (flag_move_loop_invariants || flag_unswitch_loops || flag_peel_loops || flag_unroll_loops || flag_branch_on_count_reg) flag_loop_optimize2 = 1; if (flag_non_call_exceptions) flag_asynchronous_unwind_tables = 1; if (flag_asynchronous_unwind_tables) flag_unwind_tables = 1; /* Disable unit-at-a-time mode for frontends not supporting callgraph interface. */ if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function) flag_unit_at_a_time = 0; if (flag_value_profile_transformations) flag_profile_values = 1; /* Speculative prefetching implies the value profiling. We also switch off the prefetching in the loop optimizer, so that we do not emit double prefetches. TODO -- we should teach these two to cooperate; the loop based prefetching may sometimes do a better job, especially in connection with reuse analysis. */ if (flag_speculative_prefetching) { flag_profile_values = 1; flag_prefetch_loop_arrays = 0; } /* Warn about options that are not supported on this machine. */ #ifndef INSN_SCHEDULING if (flag_schedule_insns || flag_schedule_insns_after_reload) warning ("instruction scheduling not supported on this target machine"); #endif #ifndef DELAY_SLOTS if (flag_delayed_branch) warning ("this target machine does not have delayed branches"); #endif if (flag_tree_based_profiling && flag_test_coverage) sorry ("test-coverage not yet implemented in trees."); if (flag_tree_based_profiling && flag_profile_values) sorry ("value-based profiling not yet implemented in trees."); user_label_prefix = USER_LABEL_PREFIX; if (flag_leading_underscore != -1) { /* If the default prefix is more complicated than "" or "_", issue a warning and ignore this option. */ if (user_label_prefix[0] == 0 || (user_label_prefix[0] == '_' && user_label_prefix[1] == 0)) { user_label_prefix = flag_leading_underscore ? "_" : ""; } else warning ("-f%sleading-underscore not supported on this target machine", flag_leading_underscore ? "" : "no-"); } /* If we are in verbose mode, write out the version and maybe all the option flags in use. */ if (version_flag) { print_version (stderr, ""); if (! quiet_flag) print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n"); } if (flag_syntax_only) { write_symbols = NO_DEBUG; profile_flag = 0; } /* A lot of code assumes write_symbols == NO_DEBUG if the debugging level is 0. */ if (debug_info_level == DINFO_LEVEL_NONE) write_symbols = NO_DEBUG; /* Now we know write_symbols, set up the debug hooks based on it. By default we do nothing for debug output. */ if (PREFERRED_DEBUGGING_TYPE == NO_DEBUG) default_debug_hooks = &do_nothing_debug_hooks; #if defined(DBX_DEBUGGING_INFO) else if (PREFERRED_DEBUGGING_TYPE == DBX_DEBUG) default_debug_hooks = &dbx_debug_hooks; #endif #if defined(XCOFF_DEBUGGING_INFO) else if (PREFERRED_DEBUGGING_TYPE == XCOFF_DEBUG) default_debug_hooks = &xcoff_debug_hooks; #endif #ifdef SDB_DEBUGGING_INFO else if (PREFERRED_DEBUGGING_TYPE == SDB_DEBUG) default_debug_hooks = &sdb_debug_hooks; #endif #ifdef DWARF2_DEBUGGING_INFO else if (PREFERRED_DEBUGGING_TYPE == DWARF2_DEBUG) default_debug_hooks = &dwarf2_debug_hooks; #endif #ifdef VMS_DEBUGGING_INFO else if (PREFERRED_DEBUGGING_TYPE == VMS_DEBUG || PREFERRED_DEBUGGING_TYPE == VMS_AND_DWARF2_DEBUG) default_debug_hooks = &vmsdbg_debug_hooks; #endif debug_hooks = &do_nothing_debug_hooks; if (write_symbols == NO_DEBUG) ; #if defined(DBX_DEBUGGING_INFO) else if (write_symbols == DBX_DEBUG) debug_hooks = &dbx_debug_hooks; #endif #if defined(XCOFF_DEBUGGING_INFO) else if (write_symbols == XCOFF_DEBUG) debug_hooks = &xcoff_debug_hooks; #endif #ifdef SDB_DEBUGGING_INFO else if (write_symbols == SDB_DEBUG) debug_hooks = &sdb_debug_hooks; #endif #ifdef DWARF2_DEBUGGING_INFO else if (write_symbols == DWARF2_DEBUG) debug_hooks = &dwarf2_debug_hooks; #endif #ifdef VMS_DEBUGGING_INFO else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG) debug_hooks = &vmsdbg_debug_hooks; #endif else error ("target system does not support the \"%s\" debug format", debug_type_names[write_symbols]); /* Now we know which debug output will be used so we can set flag_var_tracking, flag_rename_registers and flag_web if the user has not specified them. */ if (debug_info_level < DINFO_LEVEL_NORMAL || debug_hooks->var_location == do_nothing_debug_hooks.var_location) { if (flag_var_tracking == 1) { if (debug_info_level < DINFO_LEVEL_NORMAL) warning ("variable tracking requested, but useless unless " "producing debug info"); else warning ("variable tracking requested, but not supported " "by this debug format"); } flag_var_tracking = 0; } if (flag_rename_registers == AUTODETECT_FLAG_VAR_TRACKING) flag_rename_registers = default_debug_hooks->var_location != do_nothing_debug_hooks.var_location; if (flag_web == AUTODETECT_FLAG_VAR_TRACKING) flag_web = optimize >= 2 && (default_debug_hooks->var_location != do_nothing_debug_hooks.var_location); if (flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING) flag_var_tracking = optimize >= 1; /* If auxiliary info generation is desired, open the output file. This goes in the same directory as the source file--unlike all the other output files. */ if (flag_gen_aux_info) { aux_info_file = fopen (aux_info_file_name, "w"); if (aux_info_file == 0) fatal_error ("can't open %s: %m", aux_info_file_name); } if (! targetm.have_named_sections) { if (flag_function_sections) { warning ("-ffunction-sections not supported for this target"); flag_function_sections = 0; } if (flag_data_sections) { warning ("-fdata-sections not supported for this target"); flag_data_sections = 0; } } if (flag_function_sections && profile_flag) { warning ("-ffunction-sections disabled; it makes profiling impossible"); flag_function_sections = 0; } #ifndef HAVE_prefetch if (flag_prefetch_loop_arrays) { warning ("-fprefetch-loop-arrays not supported for this target"); flag_prefetch_loop_arrays = 0; } if (flag_speculative_prefetching) { if (flag_speculative_prefetching_set) warning ("-fspeculative-prefetching not supported for this target"); flag_speculative_prefetching = 0; } #else if (flag_prefetch_loop_arrays && !HAVE_prefetch) { warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)"); flag_prefetch_loop_arrays = 0; } if (flag_speculative_prefetching && !HAVE_prefetch) { if (flag_speculative_prefetching_set) warning ("-fspeculative-prefetching not supported for this target (try -march switches)"); flag_speculative_prefetching = 0; } #endif /* This combination of options isn't handled for i386 targets and doesn't make much sense anyway, so don't allow it. */ if (flag_prefetch_loop_arrays && optimize_size) { warning ("-fprefetch-loop-arrays is not supported with -Os"); flag_prefetch_loop_arrays = 0; } #ifndef OBJECT_FORMAT_ELF if (flag_function_sections && write_symbols != NO_DEBUG) warning ("-ffunction-sections may affect debugging on some targets"); #endif /* The presence of IEEE signaling NaNs, implies all math can trap. */ if (flag_signaling_nans) flag_trapping_math = 1; } /* Initialize the compiler back end. */ static void backend_init (void) { init_adjust_machine_modes (); init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL || debug_info_level == DINFO_LEVEL_VERBOSE #ifdef VMS_DEBUGGING_INFO /* Enable line number info for traceback. */ || debug_info_level > DINFO_LEVEL_NONE #endif || flag_test_coverage); init_regs (); init_fake_stack_mems (); init_alias_once (); init_loop (); init_reload (); init_function_once (); init_varasm_once (); /* The following initialization functions need to generate rtl, so provide a dummy function context for them. */ init_dummy_function_start (); init_expmed (); if (flag_caller_saves) init_caller_save (); expand_dummy_function_end (); } /* Language-dependent initialization. Returns nonzero on success. */ static int lang_dependent_init (const char *name) { location_t save_loc = input_location; if (dump_base_name == 0) dump_base_name = name && name[0] ? name : "gccdump"; /* Other front-end initialization. */ #ifdef USE_MAPPED_LOCATION input_location = BUILTINS_LOCATION; #else input_filename = ""; input_line = 0; #endif if (lang_hooks.init () == 0) return 0; input_location = save_loc; init_asm_output (name); /* These create various _DECL nodes, so need to be called after the front end is initialized. */ init_eh (); init_optabs (); /* The following initialization functions need to generate rtl, so provide a dummy function context for them. */ init_dummy_function_start (); init_expr_once (); expand_dummy_function_end (); /* If dbx symbol table desired, initialize writing it and output the predefined types. */ timevar_push (TV_SYMOUT); #ifdef DWARF2_UNWIND_INFO if (dwarf2out_do_frame ()) dwarf2out_frame_init (); #endif /* Now we have the correct original filename, we can initialize debug output. */ (*debug_hooks->init) (name); timevar_pop (TV_SYMOUT); return 1; } /* Clean up: close opened files, etc. */ static void finalize (void) { /* Close the dump files. */ if (flag_gen_aux_info) { fclose (aux_info_file); if (errorcount) unlink (aux_info_file_name); } /* Close non-debugging input and output files. Take special care to note whether fclose returns an error, since the pages might still be on the buffer chain while the file is open. */ if (asm_out_file) { if (ferror (asm_out_file) != 0) fatal_error ("error writing to %s: %m", asm_file_name); if (fclose (asm_out_file) != 0) fatal_error ("error closing %s: %m", asm_file_name); } finish_optimization_passes (); if (mem_report) { ggc_print_statistics (); stringpool_statistics (); dump_tree_statistics (); dump_rtx_statistics (); dump_varray_statistics (); dump_alloc_pool_statistics (); dump_ggc_loc_statistics (); } /* Free up memory for the benefit of leak detectors. */ free_reg_info (); /* Language-specific end of compilation actions. */ lang_hooks.finish (); } /* Initialize the compiler, and compile the input file. */ static void do_compile (void) { /* Initialize timing first. The C front ends read the main file in the post_options hook, and C++ does file timings. */ if (time_report || !quiet_flag || flag_detailed_statistics) timevar_init (); timevar_start (TV_TOTAL); process_options (); /* Don't do any more if an error has already occurred. */ if (!errorcount) { /* Set up the back-end if requested. */ if (!no_backend) backend_init (); /* Language-dependent initialization. Returns true on success. */ if (lang_dependent_init (main_input_filename)) compile_file (); finalize (); } /* Stop timing and print the times. */ timevar_stop (TV_TOTAL); timevar_print (stderr); } /* Entry point of cc1, cc1plus, jc1, f771, etc. Exit code is FATAL_EXIT_CODE if can't open files or if there were any errors, or SUCCESS_EXIT_CODE if compilation succeeded. It is not safe to call this function more than once. */ int toplev_main (unsigned int argc, const char **argv) { save_argv = argv; /* Initialization of GCC's environment, and diagnostics. */ general_init (argv[0]); /* Parse the options and do minimal processing; basically just enough to default flags appropriately. */ decode_options (argc, argv); randomize (); /* Exit early if we can (e.g. -help). */ if (!exit_after_options) do_compile (); if (errorcount || sorrycount) return (FATAL_EXIT_CODE); return (SUCCESS_EXIT_CODE); }