blob: 8e8486d8a624875be0e8456beb0d8920790e3a26 [file] [log] [blame]
/* Top level of GNU C compiler
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
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 <signal.h>
# include <sys/resource.h>
# include <sys/times.h>
#include "input.h"
#include "tree.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 "ssa.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"
#if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
#include "dwarf2out.h"
#include "dbxout.h"
#include "sdbout.h"
#include "xcoffout.h" /* Needed for external data
declarations for e.g. AIX 4.x. */
/* Carry information from ASM_DECLARE_OBJECT_NAME
extern int size_directive_output;
extern tree last_assemble_variable_decl;
extern void reg_alloc PARAMS ((void));
static void general_init PARAMS ((char *));
static void parse_options_and_default_flags PARAMS ((int, char **));
static void do_compile PARAMS ((void));
static void process_options PARAMS ((void));
static void backend_init PARAMS ((void));
static int lang_dependent_init PARAMS ((const char *));
static void init_asm_output PARAMS ((const char *));
static void finalize PARAMS ((void));
static void set_target_switch PARAMS ((const char *));
static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
static void compile_file PARAMS ((void));
static void display_help PARAMS ((void));
static void display_target_options PARAMS ((void));
static void decode_d_option PARAMS ((const char *));
static int decode_f_option PARAMS ((const char *));
static int decode_W_option PARAMS ((const char *));
static int decode_g_option PARAMS ((const char *));
static unsigned int independent_decode_option PARAMS ((int, char **));
static void print_version PARAMS ((FILE *, const char *));
static int print_single_switch PARAMS ((FILE *, int, int, const char *,
const char *, const char *,
const char *, const char *));
static void print_switch_values PARAMS ((FILE *, int, int, const char *,
const char *, const char *));
/* Nonzero to dump debug info whilst parsing (-dy option). */
static int set_yydebug;
/* Length of line when printing switch values. */
#define MAX_LINE 75
/* Name of program invoked, sans directories. */
const char *progname;
/* Copy of arguments to toplev_main. */
int save_argc;
char **save_argv;
/* Name of current original source file (what was input to cpp).
This comes from each #-command in the actual input. */
const char *input_filename;
/* 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;
/* Current line number in real source file. */
int lineno;
/* 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;
/* Format to use to print dumpfile index value */
#define DUMPFILE_FORMAT ".%02d."
/* 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 = &do_nothing_debug_hooks;
/* Describes a dump file. */
struct dump_file_info
/* The unique extension to apply, e.g. ".jump". */
const char *const extension;
/* The -d<c> character that enables this dump file. */
char const debug_switch;
/* True if there is a corresponding graph dump file. */
char const graph_dump_p;
/* True if the user selected this dump. */
char enabled;
/* True if the files have been initialized (ie truncated). */
char initialized;
/* Enumerate the extant dump files. */
enum dump_file_index
/* Describes all the dump files. Should be kept in order of the
pass and in sync with dump_file_index above.
Remaining -d letters:
" o q "
static struct dump_file_info dump_file[DFI_MAX] =
{ "rtl", 'r', 0, 0, 0 },
{ "sibling", 'i', 0, 0, 0 },
{ "eh", 'h', 0, 0, 0 },
{ "jump", 'j', 0, 0, 0 },
{ "ssa", 'e', 1, 0, 0 },
{ "ssaccp", 'W', 1, 0, 0 },
{ "ssadce", 'X', 1, 0, 0 },
{ "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
{ "null", 'u', 0, 0, 0 },
{ "cse", 's', 0, 0, 0 },
{ "addressof", 'F', 0, 0, 0 },
{ "gcse", 'G', 1, 0, 0 },
{ "loop", 'L', 1, 0, 0 },
{ "cfg", 'f', 1, 0, 0 },
{ "bp", 'b', 1, 0, 0 },
{ "ce1", 'C', 1, 0, 0 },
{ "tracer", 'T', 1, 0, 0 },
{ "cse2", 't', 1, 0, 0 },
{ "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
{ "combine", 'c', 1, 0, 0 },
{ "ce2", 'C', 1, 0, 0 },
{ "regmove", 'N', 1, 0, 0 },
{ "sched", 'S', 1, 0, 0 },
{ "lreg", 'l', 1, 0, 0 },
{ "greg", 'g', 1, 0, 0 },
{ "postreload", 'o', 1, 0, 0 },
{ "flow2", 'w', 1, 0, 0 },
{ "peephole2", 'z', 1, 0, 0 },
{ "rnreg", 'n', 1, 0, 0 },
{ "ce3", 'E', 1, 0, 0 },
{ "sched2", 'R', 1, 0, 0 },
{ "stack", 'k', 1, 0, 0 },
{ "bbro", 'B', 1, 0, 0 },
{ "mach", 'M', 1, 0, 0 },
{ "dbr", 'd', 0, 0, 0 },
static int open_dump_file PARAMS ((enum dump_file_index, tree));
static void close_dump_file PARAMS ((enum dump_file_index,
void (*) (FILE *, rtx), rtx));
/* Other flags saying which kinds of debugging dump have been requested. */
int rtl_dump_and_exit;
int flag_print_asm_name;
static int version_flag;
static char *filename;
enum graph_dump_types graph_dump_format;
/* Name for output file of assembly code, specified with -o. */
char *asm_file_name;
/* Value of the -G xx switch, and whether it was passed or not. */
int g_switch_value;
int g_switch_set;
/* Type(s) of debugging information we are producing (if any).
See flags.h for the definitions of the different possible
types of debugging information. */
enum debug_info_type write_symbols = NO_DEBUG;
/* Level of debugging information we are producing. See flags.h
for the definitions of the different possible levels. */
enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
/* Nonzero means use GNU-only extensions in the generated symbolic
debugging information. */
/* Currently, this only has an effect when write_symbols is set to
int use_gnu_debug_info_extensions = 0;
/* 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;
/* Nonzero if we should exit after parsing options. */
static int exit_after_options = 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;
/* Nonzero if doing dwarf2 duplicate elimination. */
int flag_eliminate_dwarf2_dups = 0;
/* Nonzero if generating code to do profiling. */
int profile_flag = 0;
/* Nonzero if generating code to profile program flow graph arcs. */
int profile_arc_flag = 0;
/* Nonzero if generating info for gcov to calculate line test coverage. */
int flag_test_coverage = 0;
/* Nonzero indicates that branch taken probabilities should be calculated. */
int flag_branch_probabilities = 0;
/* Nonzero if basic blocks should be reordered. */
int flag_reorder_blocks = 0;
/* Nonzero if functions should be reordered. */
int flag_reorder_functions = 0;
/* Nonzero if registers should be renamed. */
int flag_rename_registers = 0;
int flag_cprop_registers = 0;
/* Nonzero for -pedantic switch: warn about anything
that standard spec forbids. */
int pedantic = 0;
/* Temporarily suppress certain warnings.
This is set while reading code from a system header file. */
int in_system_header = 0;
/* Don't print functions as they are compiled. -quiet. */
int quiet_flag = 0;
/* Print times taken by the various passes. -ftime-report. */
int time_report = 0;
/* Print memory still in use at end of compilation (which may have little
to do with peak memory consumption). -fmem-report. */
int mem_report = 0;
/* Non-zero means to collect statistics which might be expensive
and to print them when we are done. */
int flag_detailed_statistics = 0;
/* -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. */
int flag_short_enums;
/* Nonzero for -fcaller-saves: allocate values in regs that need to
be saved across function calls, if that produces overall better code.
Optional now, so people can test it. */
int flag_caller_saves = 1;
int flag_caller_saves = 0;
/* 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. */
/* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
/* Nonzero for -fforce-mem: load memory value into a register
before arithmetic on it. This makes better cse but slower compilation. */
int flag_force_mem = 0;
/* Nonzero for -fforce-addr: load memory address into a register before
reference to memory. This makes better cse but slower compilation. */
int flag_force_addr = 0;
/* Nonzero for -fdefer-pop: don't pop args after each function call;
instead save them up to pop many calls' args with one insns. */
int flag_defer_pop = 0;
/* Nonzero for -ffloat-store: don't allocate floats and doubles
in extended-precision registers. */
int flag_float_store = 0;
/* Nonzero for -fcse-follow-jumps:
have cse follow jumps to do a more extensive job. */
int flag_cse_follow_jumps;
/* Nonzero for -fcse-skip-blocks:
have cse follow a branch around a block. */
int flag_cse_skip_blocks;
/* Nonzero for -fexpensive-optimizations:
perform miscellaneous relatively-expensive optimizations. */
int flag_expensive_optimizations;
/* Nonzero for -fthread-jumps:
have jump optimize output of loop. */
int flag_thread_jumps;
/* Nonzero enables strength-reduction in loop.c. */
int flag_strength_reduce = 0;
/* Nonzero enables loop unrolling in unroll.c. Only loops for which the
number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
unrolled. */
int flag_unroll_loops;
/* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
This is generally not a win. */
int flag_unroll_all_loops;
/* Nonzero enables prefetch optimizations for arrays in loops. */
int flag_prefetch_loop_arrays;
/* Nonzero forces all invariant computations in loops to be moved
outside the loop. */
int flag_move_all_movables = 0;
/* Nonzero forces all general induction variables in loops to be
strength reduced. */
int flag_reduce_all_givs = 0;
/* Nonzero to perform full register move optimization passes. This is the
default for -O2. */
int flag_regmove = 0;
/* Nonzero for -fwritable-strings:
store string constants in data segment and don't uniquize them. */
int flag_writable_strings = 0;
/* Nonzero means don't put addresses of constant functions in registers.
Used for compiling the Unix kernel, where strange substitutions are
done on the assembly output. */
int flag_no_function_cse = 0;
/* Nonzero for -fomit-frame-pointer:
don't make a frame pointer in simple functions that don't require one. */
int flag_omit_frame_pointer = 0;
/* Nonzero means place each function into its own section on those platforms
which support arbitrary section names and unlimited numbers of sections. */
int flag_function_sections = 0;
/* ... and similar for data. */
int flag_data_sections = 0;
/* Nonzero to inhibit use of define_optimization peephole opts. */
int flag_no_peephole = 0;
/* Nonzero allows GCC to optimize sibling and tail recursive calls. */
int flag_optimize_sibling_calls = 0;
/* Nonzero means the front end generally wants `errno' maintained by math
operations, like built-in SQRT. */
int flag_errno_math = 1;
/* Nonzero means that unsafe floating-point math optimizations are allowed
for the sake of speed. IEEE compliance is not guaranteed, and operations
are allowed to assume that their arguments and results are "normal"
(e.g., nonnegative for SQRT). */
int flag_unsafe_math_optimizations = 0;
/* Nonzero means that no NaNs or +-Infs are expected. */
int flag_finite_math_only = 0;
/* Zero means that floating-point math operations cannot generate a
(user-visible) trap. This is the case, for example, in nonstop
IEEE 754 arithmetic. Trapping conditions include division by zero,
overflow, underflow, invalid and inexact, but does not include
operations on signaling NaNs (see below). */
int flag_trapping_math = 1;
/* Nonzero means disable transformations observable by signaling NaNs.
This option implies that any operation on a IEEE signaling NaN can
generate a (user-visible) trap. */
int flag_signaling_nans = 0;
/* 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 all references through pointers are volatile. */
int flag_volatile;
/* Nonzero means treat all global and extern variables as volatile. */
int flag_volatile_global;
/* Nonzero means treat all static variables as volatile. */
int flag_volatile_static;
/* Nonzero means just do syntax checking; don't output anything. */
int flag_syntax_only = 0;
/* Nonzero means perform global cse. */
static int flag_gcse;
/* Nonzero means perform loop optimizer. */
static int flag_loop_optimize;
/* Nonzero means perform crossjumping. */
static int flag_crossjumping;
/* Nonzero means perform if conversion. */
static int flag_if_conversion;
/* Nonzero means perform if conversion after reload. */
static int flag_if_conversion2;
/* Nonzero means to use global dataflow analysis to eliminate
useless null pointer tests. */
static int flag_delete_null_pointer_checks;
/* Nonzero means to do the enhanced load motion during gcse, which trys
to hoist loads by not killing them when a store to the same location
is seen. */
int flag_gcse_lm = 1;
/* Nonzero means to perform store motion after gcse, which will try to
move stores closer to the exit block. Its not very effective without
flag_gcse_lm. */
int flag_gcse_sm = 1;
/* Nonzero means to rerun cse after loop optimization. This increases
compilation time about 20% and picks up a few more common expressions. */
static int flag_rerun_cse_after_loop;
/* Nonzero means to run loop optimizations twice. */
int flag_rerun_loop_opt;
/* Nonzero for -finline-functions: ok to inline functions that look like
good inline candidates. */
int flag_inline_functions;
/* Nonzero for -fkeep-inline-functions: even if we make a function
go inline everywhere, keep its definition around for debugging
purposes. */
int flag_keep_inline_functions;
/* Nonzero means that functions will not be inlined. */
int flag_no_inline = 2;
/* 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 that we should emit static const variables
regardless of whether or not optimization is turned on. */
int flag_keep_static_consts = 1;
/* Nonzero means we should be saving declaration info into a .X file. */
int flag_gen_aux_info = 0;
/* Specified name of aux-info file. */
static char *aux_info_file_name;
/* Nonzero means make the text shared if supported. */
int flag_shared_data;
/* Nonzero means schedule into delayed branch slots if supported. */
int flag_delayed_branch;
/* Nonzero if we are compiling pure (sharable) code.
Value is 1 if we are doing "small" pic; value is 2 if we're doing
"large" pic. */
int flag_pic;
/* Set to the default thread-local storage (tls) model to use. */
enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
/* Nonzero means generate extra code for exception handling and enable
exception handling. */
int flag_exceptions;
/* Nonzero means generate frame unwind info table when supported. */
int flag_unwind_tables = 0;
/* Nonzero means generate frame unwind info table exact at each insn boundary */
int flag_asynchronous_unwind_tables = 0;
/* Nonzero means don't place uninitialized global data in common storage
by default. */
int flag_no_common;
/* Nonzero means change certain warnings into errors.
Usually these are warnings about failure to conform to some standard. */
int flag_pedantic_errors = 0;
/* flag_schedule_insns means schedule insns within basic blocks (before
flag_schedule_insns_after_reload means schedule insns after
global_alloc. */
int flag_schedule_insns = 0;
int flag_schedule_insns_after_reload = 0;
/* The following flags have effect only for scheduling before register
flag_schedule_interblock means schedule insns accross basic blocks.
flag_schedule_speculative means allow speculative motion of non-load insns.
flag_schedule_speculative_load means allow speculative motion of some
load insns.
flag_schedule_speculative_load_dangerous allows speculative motion of more
load insns. */
int flag_schedule_interblock = 1;
int flag_schedule_speculative = 1;
int flag_schedule_speculative_load = 0;
int flag_schedule_speculative_load_dangerous = 0;
int flag_single_precision_constant;
/* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
by a cheaper branch on a count register. */
int flag_branch_on_count_reg = 1;
/* -finhibit-size-directive inhibits output of .size for ELF.
This is used only for compiling crtstuff.c,
and it may be extended to other effects
needed for crtstuff.c on other systems. */
int flag_inhibit_size_directive = 0;
/* -fverbose-asm causes extra 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).
-fno-verbose-asm, the default, causes the extra information
to be omitted and is useful when comparing two assembler files. */
int flag_verbose_asm = 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;
/* -fgnu-linker specifies use of the GNU linker for initializations.
(Or, more generally, a linker that handles initializations.)
-fno-gnu-linker says that collect2 will be used. */
int flag_gnu_linker = 0;
int flag_gnu_linker = 1;
/* Nonzero means put zero initialized data in the bss section. */
int flag_zero_initialized_in_bss = 1;
/* Enable SSA. */
int flag_ssa = 0;
/* Enable ssa conditional constant propagation. */
int flag_ssa_ccp = 0;
/* Enable ssa aggressive dead code elimination. */
int flag_ssa_dce = 0;
/* Tag all structures with __attribute__(packed). */
int flag_pack_struct = 0;
/* Emit code to check for stack overflow; also may cause large objects
to be allocated dynamically. */
int flag_stack_check;
/* 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;
/* 0 if pointer arguments may alias each other. True in C.
1 if pointer arguments may not alias each other but may alias
global variables.
2 if pointer arguments may not alias each other and may not
alias global variables. True in Fortran.
This defaults to 0 for C. */
int flag_argument_noalias = 0;
/* Nonzero if we should do (language-dependent) alias analysis.
Typically, this analysis will assume that expressions of certain
types do not alias expressions of certain other types. Only used
if alias analysis (in general) is enabled. */
int flag_strict_aliasing = 0;
/* Instrument functions with calls at entry and exit, for profiling. */
int flag_instrument_function_entry_exit = 0;
/* Nonzero means ignore `#ident' directives. 0 means handle them.
On SVR4 targets, it also controls whether or not to emit a
string identifying the compiler. */
int flag_no_ident = 0;
/* This will perform a peephole pass before sched2. */
int flag_peephole2 = 0;
/* This will try to guess branch probabilities. */
int flag_guess_branch_prob = 0;
/* -fcheck-bounds causes gcc to generate array bounds checks.
For C, C++, ObjC: defaults to off.
For Java: defaults to on.
For Fortran: defaults to off. */
int flag_bounds_check = 0;
/* This will attempt to merge constant section constants, if 1 only
string constants and constants from constant pool, if 2 also constant
variables. */
int flag_merge_constants = 1;
/* 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;
/* If nonzero, use the graph coloring register allocator. */
int flag_new_regalloc = 0;
/* Nonzero if we perform superblock formation. */
int flag_tracer = 0;
/* 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;
int align_loops_log;
int align_loops_max_skip;
int align_jumps;
int align_jumps_log;
int align_jumps_max_skip;
int align_labels;
int align_labels_log;
int align_labels_max_skip;
int align_functions;
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;
/* Table of supported debugging formats. */
static const struct
const char *const arg;
/* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
constant expression, we use NO_DEBUG in its place. */
const enum debug_info_type debug_type;
const int use_extensions_p;
const char *const description;
} *da,
debug_args[] =
N_("Generate debugging info in default format") },
{ "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
{ "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
{ "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
{ "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
{ "dwarf+", DWARF_DEBUG, 1,
N_("Generate extended DWARF-1 format debug info") },
{ "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
{ "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
{ "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
{ "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
{ "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
{ 0, 0, 0, 0 }
typedef struct
const char *const string;
int *const variable;
const int on_value;
const char *const description;
int flag_trapv = 0;
/* Add or remove a leading underscore from user symbols. */
int flag_leading_underscore = -1;
/* The user symbol prefix after having resolved same. */
const char *user_label_prefix;
static const param_info lang_independent_params[] = {
#include "params.def"
{ NULL, 0, NULL }
/* Table of language-independent -f options.
STRING is the option name. VARIABLE is the address of the variable.
ON_VALUE is the value to store in VARIABLE
if `-fSTRING' is seen as an option.
(If `-fno-STRING' is seen as an option, the opposite value is stored.) */
static const lang_independent_options f_options[] =
{"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
N_("Perform DWARF2 duplicate elimination") },
{"float-store", &flag_float_store, 1,
N_("Do not store floats in registers") },
{"volatile", &flag_volatile, 1,
N_("Consider all mem refs through pointers as volatile") },
{"volatile-global", &flag_volatile_global, 1,
N_("Consider all mem refs to global data to be volatile") },
{"volatile-static", &flag_volatile_static, 1,
N_("Consider all mem refs to static data to be volatile") },
{"defer-pop", &flag_defer_pop, 1,
N_("Defer popping functions args from stack until later") },
{"omit-frame-pointer", &flag_omit_frame_pointer, 1,
N_("When possible do not generate stack frames") },
{"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
N_("Optimize sibling and tail recursive calls") },
{"tracer", &flag_tracer, 1,
N_("Perform superblock formation via tail duplication") },
{"cse-follow-jumps", &flag_cse_follow_jumps, 1,
N_("When running CSE, follow jumps to their targets") },
{"cse-skip-blocks", &flag_cse_skip_blocks, 1,
N_("When running CSE, follow conditional jumps") },
{"expensive-optimizations", &flag_expensive_optimizations, 1,
N_("Perform a number of minor, expensive optimizations") },
{"thread-jumps", &flag_thread_jumps, 1,
N_("Perform jump threading optimizations") },
{"strength-reduce", &flag_strength_reduce, 1,
N_("Perform strength reduction optimizations") },
{"unroll-loops", &flag_unroll_loops, 1,
N_("Perform loop unrolling when iteration count is known") },
{"unroll-all-loops", &flag_unroll_all_loops, 1,
N_("Perform loop unrolling for all loops") },
{"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
N_("Generate prefetch instructions, if available, for arrays in loops") },
{"move-all-movables", &flag_move_all_movables, 1,
N_("Force all loop invariant computations out of loops") },
{"reduce-all-givs", &flag_reduce_all_givs, 1,
N_("Strength reduce all loop general induction variables") },
{"writable-strings", &flag_writable_strings, 1,
N_("Store strings in writable data section") },
{"peephole", &flag_no_peephole, 0,
N_("Enable machine specific peephole optimizations") },
{"force-mem", &flag_force_mem, 1,
N_("Copy memory operands into registers before using") },
{"force-addr", &flag_force_addr, 1,
N_("Copy memory address constants into regs before using") },
{"function-cse", &flag_no_function_cse, 0,
N_("Allow function addresses to be held in registers") },
{"inline-functions", &flag_inline_functions, 1,
N_("Integrate simple functions into their callers") },
{"keep-inline-functions", &flag_keep_inline_functions, 1,
N_("Generate code for funcs even if they are fully inlined") },
{"inline", &flag_no_inline, 0,
N_("Pay attention to the 'inline' keyword") },
{"keep-static-consts", &flag_keep_static_consts, 1,
N_("Emit static const variables even if they are not used") },
{"syntax-only", &flag_syntax_only, 1,
N_("Check for syntax errors, then stop") },
{"shared-data", &flag_shared_data, 1,
N_("Mark data as shared rather than private") },
{"caller-saves", &flag_caller_saves, 1,
N_("Enable saving registers around function calls") },
{"pcc-struct-return", &flag_pcc_struct_return, 1,
N_("Return 'short' aggregates in memory, not registers") },
{"reg-struct-return", &flag_pcc_struct_return, 0,
N_("Return 'short' aggregates in registers") },
{"delayed-branch", &flag_delayed_branch, 1,
N_("Attempt to fill delay slots of branch instructions") },
{"gcse", &flag_gcse, 1,
N_("Perform the global common subexpression elimination") },
{"gcse-lm", &flag_gcse_lm, 1,
N_("Perform enhanced load motion during global subexpression elimination") },
{"gcse-sm", &flag_gcse_sm, 1,
N_("Perform store motion after global subexpression elimination") },
{"loop-optimize", &flag_loop_optimize, 1,
N_("Perform the loop optimizations") },
{"crossjumping", &flag_crossjumping, 1,
N_("Perform cross-jumping optimization") },
{"if-conversion", &flag_if_conversion, 1,
N_("Perform conversion of conditional jumps to branchless equivalents") },
{"if-conversion2", &flag_if_conversion2, 1,
N_("Perform conversion of conditional jumps to conditional execution") },
{"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
N_("Run CSE pass after loop optimizations") },
{"rerun-loop-opt", &flag_rerun_loop_opt, 1,
N_("Run the loop optimizer twice") },
{"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
N_("Delete useless null pointer checks") },
{"schedule-insns", &flag_schedule_insns, 1,
N_("Reschedule instructions before register allocation") },
{"schedule-insns2", &flag_schedule_insns_after_reload, 1,
N_("Reschedule instructions after register allocation") },
{"sched-interblock",&flag_schedule_interblock, 1,
N_("Enable scheduling across basic blocks") },
{"sched-spec",&flag_schedule_speculative, 1,
N_("Allow speculative motion of non-loads") },
{"sched-spec-load",&flag_schedule_speculative_load, 1,
N_("Allow speculative motion of some loads") },
{"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
N_("Allow speculative motion of more loads") },
{"branch-count-reg",&flag_branch_on_count_reg, 1,
N_("Replace add,compare,branch with branch on count reg") },
{"pic", &flag_pic, 1,
N_("Generate position independent code, if possible") },
{"PIC", &flag_pic, 2, ""},
{"exceptions", &flag_exceptions, 1,
N_("Enable exception handling") },
{"unwind-tables", &flag_unwind_tables, 1,
N_("Just generate unwind tables for exception handling") },
{"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
N_("Generate unwind tables exact at each instruction boundary") },
{"non-call-exceptions", &flag_non_call_exceptions, 1,
N_("Support synchronous non-call exceptions") },
{"profile-arcs", &profile_arc_flag, 1,
N_("Insert arc based program profiling code") },
{"test-coverage", &flag_test_coverage, 1,
N_("Create data files needed by gcov") },
{"branch-probabilities", &flag_branch_probabilities, 1,
N_("Use profiling information for branch probabilities") },
{"profile", &profile_flag, 1,
N_("Enable basic program profiling code") },
{"reorder-blocks", &flag_reorder_blocks, 1,
N_("Reorder basic blocks to improve code placement") },
{"reorder-functions", &flag_reorder_functions, 1,
N_("Reorder functions to improve code placement") },
{"rename-registers", &flag_rename_registers, 1,
N_("Do the register renaming optimization pass") },
{"cprop-registers", &flag_cprop_registers, 1,
N_("Do the register copy-propagation optimization pass") },
{"common", &flag_no_common, 0,
N_("Do not put uninitialized globals in the common section") },
{"inhibit-size-directive", &flag_inhibit_size_directive, 1,
N_("Do not generate .size directives") },
{"function-sections", &flag_function_sections, 1,
N_("place each function into its own section") },
{"data-sections", &flag_data_sections, 1,
N_("place data items into their own section") },
{"verbose-asm", &flag_verbose_asm, 1,
N_("Add extra commentary to assembler output") },
{"gnu-linker", &flag_gnu_linker, 1,
N_("Output GNU ld formatted global initializers") },
{"regmove", &flag_regmove, 1,
N_("Enables a register move optimization") },
{"optimize-register-move", &flag_regmove, 1,
N_("Do the full regmove optimization pass") },
{"pack-struct", &flag_pack_struct, 1,
N_("Pack structure members together without holes") },
{"stack-check", &flag_stack_check, 1,
N_("Insert stack checking code into the program") },
{"argument-alias", &flag_argument_noalias, 0,
N_("Specify that arguments may alias each other & globals") },
{"argument-noalias", &flag_argument_noalias, 1,
N_("Assume arguments may alias globals but not each other") },
{"argument-noalias-global", &flag_argument_noalias, 2,
N_("Assume arguments do not alias each other or globals") },
{"strict-aliasing", &flag_strict_aliasing, 1,
N_("Assume strict aliasing rules apply") },
{"align-loops", &align_loops, 0,
N_("Align the start of loops") },
{"align-jumps", &align_jumps, 0,
N_("Align labels which are only reached by jumping") },
{"align-labels", &align_labels, 0,
N_("Align all labels") },
{"align-functions", &align_functions, 0,
N_("Align the start of functions") },
{"merge-constants", &flag_merge_constants, 1,
N_("Attempt to merge identical constants across compilation units") },
{"merge-all-constants", &flag_merge_constants, 2,
N_("Attempt to merge identical constants and constant variables") },
{"dump-unnumbered", &flag_dump_unnumbered, 1,
N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
{"instrument-functions", &flag_instrument_function_entry_exit, 1,
N_("Instrument function entry/exit with profiling calls") },
{"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
N_("Put zero initialized data in the bss section") },
{"ssa", &flag_ssa, 1,
N_("Enable SSA optimizations") },
{"ssa-ccp", &flag_ssa_ccp, 1,
N_("Enable SSA conditional constant propagation") },
{"ssa-dce", &flag_ssa_dce, 1,
N_("Enable aggressive SSA dead code elimination") },
{"leading-underscore", &flag_leading_underscore, 1,
N_("External symbols have a leading underscore") },
{"ident", &flag_no_ident, 0,
N_("Process #ident directives") },
{ "peephole2", &flag_peephole2, 1,
N_("Enables an rtl peephole pass run before sched2") },
{"finite-math-only", &flag_finite_math_only, 1,
N_("Assume no NaNs or +-Infs are generated") },
{ "guess-branch-probability", &flag_guess_branch_prob, 1,
N_("Enables guessing of branch probabilities") },
{"math-errno", &flag_errno_math, 1,
N_("Set errno after built-in math functions") },
{"trapping-math", &flag_trapping_math, 1,
N_("Floating-point operations can trap") },
{"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
N_("Allow math optimizations that may violate IEEE or ANSI standards") },
{"signaling-nans", &flag_signaling_nans, 1,
N_("Disable optimizations observable by IEEE signaling NaNs") },
{"bounds-check", &flag_bounds_check, 1,
N_("Generate code to check bounds before indexing arrays") },
{"single-precision-constant", &flag_single_precision_constant, 1,
N_("Convert floating point constant to single precision constant") },
{"time-report", &time_report, 1,
N_("Report time taken by each compiler pass at end of run") },
{"mem-report", &mem_report, 1,
N_("Report on permanent memory allocation at end of run") },
{ "trapv", &flag_trapv, 1,
N_("Trap for signed overflow in addition / subtraction / multiplication") },
{ "new-ra", &flag_new_regalloc, 1,
N_("Use graph coloring register allocation.") },
/* Table of language-specific options. */
static const struct lang_opt
const char *const option;
const char *const description;
documented_lang_options[] =
/* In order not to overload the --help output, the convention
used here is to only describe those options which are not
enabled by default. */
{ "-ansi",
N_("Compile just for ISO C90") },
{ "-std= ",
N_("Determine language standard") },
{ "-fsigned-bitfields", "" },
{ "-funsigned-bitfields",
N_("Make bit-fields by unsigned by default") },
{ "-fno-signed-bitfields", "" },
{ "-fno-unsigned-bitfields","" },
{ "-fsigned-char",
N_("Make 'char' be signed by default") },
{ "-funsigned-char",
N_("Make 'char' be unsigned by default") },
{ "-fno-signed-char", "" },
{ "-fno-unsigned-char", "" },
{ "-fasm", "" },
{ "-fno-asm",
N_("Do not recognize the 'asm' keyword") },
{ "-fbuiltin", "" },
{ "-fno-builtin",
N_("Do not recognize any built in functions") },
{ "-fhosted",
N_("Assume normal C execution environment") },
{ "-fno-hosted", "" },
{ "-ffreestanding",
N_("Assume that standard libraries & main might not exist") },
{ "-fno-freestanding", "" },
{ "-fcond-mismatch",
N_("Allow different types as args of ? operator") },
{ "-fno-cond-mismatch", "" },
{ "-fdollars-in-identifiers",
N_("Allow the use of $ inside identifiers") },
{ "-fno-dollars-in-identifiers", "" },
{ "-fpreprocessed", "" },
{ "-fno-preprocessed", "" },
{ "-fshort-double",
N_("Use the same size for double as for float") },
{ "-fno-short-double", "" },
{ "-fshort-enums",
N_("Use the smallest fitting integer to hold enums") },
{ "-fno-short-enums", "" },
{ "-fshort-wchar",
N_("Override the underlying type for wchar_t to `unsigned short'") },
{ "-fno-short-wchar", "" },
{ "-Wall",
N_("Enable most warning messages") },
{ "-Wbad-function-cast",
N_("Warn about casting functions to incompatible types") },
{ "-Wno-bad-function-cast", "" },
{ "-Wmissing-format-attribute",
N_("Warn about functions which might be candidates for format attributes") },
{ "-Wno-missing-format-attribute", "" },
{ "-Wcast-qual",
N_("Warn about casts which discard qualifiers") },
{ "-Wno-cast-qual", "" },
{ "-Wchar-subscripts",
N_("Warn about subscripts whose type is 'char'") },
{ "-Wno-char-subscripts", "" },
{ "-Wcomment",
N_("Warn if nested comments are detected") },
{ "-Wno-comment", "" },
{ "-Wcomments",
N_("Warn if nested comments are detected") },
{ "-Wno-comments", "" },
{ "-Wconversion",
N_("Warn about possibly confusing type conversions") },
{ "-Wno-conversion", "" },
{ "-Wdiv-by-zero", "" },
{ "-Wno-div-by-zero",
N_("Do not warn about compile-time integer division by zero") },
{ "-Wfloat-equal",
N_("Warn about testing equality of floating point numbers") },
{ "-Wno-float-equal", "" },
{ "-Wformat",
N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
{ "-Wno-format", "" },
{ "-Wformat-extra-args", "" },
{ "-Wno-format-extra-args",
N_("Don't warn about too many arguments to format functions") },
{ "-Wformat-nonliteral",
N_("Warn about non-string-literal format strings") },
{ "-Wno-format-nonliteral", "" },
{ "-Wformat-security",
N_("Warn about possible security problems with format functions") },
{ "-Wno-format-security", "" },
{ "-Wformat-y2k", "" },
{ "-Wno-format-y2k",
N_("Don't warn about strftime formats yielding 2 digit years") },
{ "-Wimplicit-function-declaration",
N_("Warn about implicit function declarations") },
{ "-Wno-implicit-function-declaration", "" },
{ "-Werror-implicit-function-declaration", "" },
{ "-Wimplicit-int",
N_("Warn when a declaration does not specify a type") },
{ "-Wno-implicit-int", "" },
{ "-Wimplicit", "" },
{ "-Wno-implicit", "" },
{ "-Wimport",
N_("Warn about the use of the #import directive") },
{ "-Wno-import", "" },
{ "-Wlong-long","" },
{ "-Wno-long-long",
N_("Do not warn about using 'long long' when -pedantic") },
{ "-Wmain",
N_("Warn about suspicious declarations of main") },
{ "-Wno-main", "" },
{ "-Wmissing-braces",
N_("Warn about possibly missing braces around initializers") },
{ "-Wno-missing-braces", "" },
{ "-Wmissing-declarations",
N_("Warn about global funcs without previous declarations") },
{ "-Wno-missing-declarations", "" },
{ "-Wmissing-prototypes",
N_("Warn about global funcs without prototypes") },
{ "-Wno-missing-prototypes", "" },
{ "-Wmultichar",
N_("Warn about use of multicharacter literals") },
{ "-Wno-multichar", "" },
{ "-Wnested-externs",
N_("Warn about externs not at file scope level") },
{ "-Wno-nested-externs", "" },
{ "-Wparentheses",
N_("Warn about possible missing parentheses") },
{ "-Wno-parentheses", "" },
{ "-Wpointer-arith",
N_("Warn about function pointer arithmetic") },
{ "-Wno-pointer-arith", "" },
{ "-Wredundant-decls",
N_("Warn about multiple declarations of the same object") },
{ "-Wno-redundant-decls", "" },
{ "-Wreturn-type",
N_("Warn whenever a function's return-type defaults to int") },
{ "-Wno-return-type", "" },
{ "-Wsequence-point",
N_("Warn about possible violations of sequence point rules") },
{ "-Wno-sequence-point", "" },
{ "-Wsign-compare",
N_("Warn about signed/unsigned comparisons") },
{ "-Wno-sign-compare", "" },
{ "-Wstrict-prototypes",
N_("Warn about non-prototyped function decls") },
{ "-Wno-strict-prototypes", "" },
{ "-Wtraditional",
N_("Warn about constructs whose meanings change in ISO C") },
{ "-Wno-traditional", "" },
{ "-Wtrigraphs",
N_("Warn when trigraphs are encountered") },
{ "-Wno-trigraphs", "" },
{ "-Wundef", "" },
{ "-Wno-undef", "" },
{ "-Wunknown-pragmas",
N_("Warn about unrecognized pragmas") },
{ "-Wno-unknown-pragmas", "" },
{ "-Wwrite-strings",
N_("Mark strings as 'const char *'") },
{ "-Wno-write-strings", "" },
#include "options.h"
/* 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. */
static const struct
const char *const prefix;
const char **const variable;
const char *const description;
target_options[] = TARGET_OPTIONS;
/* Options controlling warnings. */
/* Don't print warning messages. -w. */
int inhibit_warnings = 0;
/* Don't suppress warnings from system headers. -Wsystem-headers. */
int warn_system_headers = 0;
/* Print various extra warnings. -W. */
int extra_warnings = 0;
/* Treat warnings as errors. -Werror. */
int warnings_are_errors = 0;
/* Nonzero to warn about unused variables, functions */
int warn_unused_function;
int warn_unused_label;
int warn_unused_parameter;
int warn_unused_variable;
int warn_unused_value;
/* Nonzero to warn about code which is never reached. */
int warn_notreached;
/* Nonzero to warn about variables used before they are initialized. */
int warn_uninitialized;
/* Nonzero means warn about all declarations which shadow others. */
int warn_shadow;
/* Warn if a switch on an enum, that does not have a default case,
fails to have a case for every enum value. */
int warn_switch;
/* Warn if a switch does not have a default case. */
int warn_switch_default;
/* Warn if a switch on an enum fails to have a case for every enum
value (regardless of the presence or otherwise of a default case). */
int warn_switch_enum;
/* 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;
/* Nonzero means warn about pointer casts that increase the required
alignment of the target type (and might therefore lead to a crash
due to a misaligned access). */
int warn_cast_align;
/* Nonzero means warn about any objects definitions whose size is larger
than N bytes. Also want about function definitions whose returned
values are larger than N bytes. The value N is in `larger_than_size'. */
int warn_larger_than;
HOST_WIDE_INT larger_than_size;
/* Nonzero means warn if inline function is too large. */
int warn_inline;
/* Warn if a function returns an aggregate,
since there are often incompatible calling conventions for doing this. */
int warn_aggregate_return;
/* Warn if packed attribute on struct is unnecessary and inefficient. */
int warn_packed;
/* Warn when gcc pads a structure to an alignment boundary. */
int warn_padded;
/* Warn when an optimization pass is disabled. */
int warn_disabled_optimization;
/* Warn about functions which might be candidates for attribute noreturn. */
int warn_missing_noreturn;
/* Nonzero means warn about uses of __attribute__((deprecated))
declarations. */
int warn_deprecated_decl = 1;
/* Nonzero means warn about constructs which might not be
strict-aliasing safe. */
int warn_strict_aliasing;
/* Likewise for -W. */
static const lang_independent_options W_options[] =
{"unused-function", &warn_unused_function, 1,
N_("Warn when a function is unused") },
{"unused-label", &warn_unused_label, 1,
N_("Warn when a label is unused") },
{"unused-parameter", &warn_unused_parameter, 1,
N_("Warn when a function parameter is unused") },
{"unused-variable", &warn_unused_variable, 1,
N_("Warn when a variable is unused") },
{"unused-value", &warn_unused_value, 1,
N_("Warn when an expression value is unused") },
{"system-headers", &warn_system_headers, 1,
N_("Do not suppress warnings from system headers") },
{"error", &warnings_are_errors, 1,
N_("Treat all warnings as errors") },
{"shadow", &warn_shadow, 1,
N_("Warn when one local variable shadows another") },
{"switch", &warn_switch, 1,
N_("Warn about enumerated switches, with no default, missing a case") },
{"switch-default", &warn_switch_default, 1,
N_("Warn about enumerated switches missing a default case") },
{"switch-enum", &warn_switch_enum, 1,
N_("Warn about all enumerated switches missing a specific case") },
{"aggregate-return", &warn_aggregate_return, 1,
N_("Warn about returning structures, unions or arrays") },
{"cast-align", &warn_cast_align, 1,
N_("Warn about pointer casts which increase alignment") },
{"unreachable-code", &warn_notreached, 1,
N_("Warn about code that will never be executed") },
{"uninitialized", &warn_uninitialized, 1,
N_("Warn about uninitialized automatic variables") },
{"inline", &warn_inline, 1,
N_("Warn when an inlined function cannot be inlined") },
{"packed", &warn_packed, 1,
N_("Warn when the packed attribute has no effect on struct layout") },
{"padded", &warn_padded, 1,
N_("Warn when padding is required to align struct members") },
{"disabled-optimization", &warn_disabled_optimization, 1,
N_("Warn when an optimization pass is disabled") },
{"deprecated-declarations", &warn_deprecated_decl, 1,
N_("Warn about uses of __attribute__((deprecated)) declarations") },
{"missing-noreturn", &warn_missing_noreturn, 1,
N_("Warn about functions which might be candidates for attribute noreturn") },
{"strict-aliasing", &warn_strict_aliasing, 1,
N_ ("Warn about code which might break the strict aliasing rules") }
set_Wunused (setting)
int setting;
warn_unused_function = setting;
warn_unused_label = setting;
/* Unused function parameter warnings are reported when either ``-W
-Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
-Wunused by setting WARN_UNUSED_PARAMETER to -1. */
if (!setting)
warn_unused_parameter = 0;
else if (!warn_unused_parameter)
warn_unused_parameter = -1;
warn_unused_variable = setting;
warn_unused_value = setting;
/* The following routines are useful in setting all the flags that
-ffast-math and -fno-fast-math imply. */
set_fast_math_flags (set)
int set;
flag_trapping_math = !set;
flag_unsafe_math_optimizations = set;
flag_finite_math_only = set;
flag_errno_math = !set;
if (set)
flag_signaling_nans = 0;
/* Return true iff flags are set as if -ffast-math. */
fast_math_flags_set_p ()
return (!flag_trapping_math
&& flag_unsafe_math_optimizations
&& flag_finite_math_only
&& !flag_errno_math);
/* Output files for assembler code (real compiler output)
and debugging dumps. */
FILE *asm_out_file;
FILE *aux_info_file;
FILE *rtl_dump_file = NULL;
/* 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. */
read_integral_parameter (p, pname, defval)
const char *p;
const char *pname;
const int defval;
const char *endp = p;
while (*endp)
if (ISDIGIT (*endp))
if (*endp != 0)
if (pname != 0)
error ("invalid option `%s'", pname);
return defval;
return atoi (p);
/* This calls abort and is used to avoid problems when abort is a macro.
It is used when we need to pass the address of abort. */
do_abort ()
abort ();
/* When `malloc.c' is compiled with `rcheck' defined,
it calls this function to report clobberage. */
botch (s)
const char *s ATTRIBUTE_UNUSED;
abort ();
/* 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. */
exact_log2_wide (x)
unsigned HOST_WIDE_INT x;
int log = 0;
/* Test for 0 or a power of 2. */
if (x == 0 || x != (x & -x))
return -1;
while ((x >>= 1) != 0)
return log;
/* 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. */
floor_log2_wide (x)
unsigned HOST_WIDE_INT x;
int log = -1;
while (x != 0)
x >>= 1;
return log;
/* Handler for fatal signals, such as SIGSEGV. These are transformed
into ICE messages, which is much more user friendly. */
static void
crash_signal (signo)
int signo;
internal_error ("%s", strsignal (signo));
/* 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".) */
strip_off_ending (name, len)
char *name;
int len;
int i;
for (i = 2; i < 6 && len > i; i++)
if (name[len - i] == '.')
name[len - i] = '\0';
/* Output a quoted string. */
output_quoted_string (asm_file, string)
FILE *asm_file;
const char *string;
OUTPUT_QUOTED_STRING (asm_file, string);
char c;
putc ('\"', asm_file);
while ((c = *string++) != 0)
if (ISPRINT (c))
if (c == '\"' || c == '\\')
putc ('\\', asm_file);
putc (c, asm_file);
fprintf (asm_file, "\\%03o", (unsigned char) c);
putc ('\"', asm_file);
/* Output NAME into FILE after having turned it into something
usable as an identifier in a target's assembly file. */
output_clean_symbol_name (file, name)
FILE *file;
const char *name;
/* Make a copy of NAME. */
char *id = xstrdup (name);
/* Make it look like a valid identifier for an assembler. */
clean_symbol_name (id);
fputs (id, file);
free (id);
/* Output a file name in the form wanted by System V. */
output_file_directive (asm_file, input_name)
FILE *asm_file;
const char *input_name;
int len = strlen (input_name);
const char *na = input_name + len;
/* NA gets INPUT_NAME sans directory names. */
while (na > input_name)
if (IS_DIR_SEPARATOR (na[-1]))
fprintf (asm_file, "\t.file\t");
output_quoted_string (asm_file, na);
fputc ('\n', asm_file);
/* Routine to open a dump file. Return true if the dump file is enabled. */
static int
open_dump_file (index, decl)
enum dump_file_index index;
tree decl;
char *dump_name;
const char *open_arg;
char seq[16];
if (! dump_file[index].enabled)
return 0;
timevar_push (TV_DUMP);
if (rtl_dump_file != NULL)
fclose (rtl_dump_file);
sprintf (seq, DUMPFILE_FORMAT, index);
if (! dump_file[index].initialized)
/* If we've not initialized the files, do so now. */
if (graph_dump_format != no_graph
&& dump_file[index].graph_dump_p)
dump_name = concat (seq, dump_file[index].extension, NULL);
clean_graph_dump_file (dump_base_name, dump_name);
free (dump_name);
dump_file[index].initialized = 1;
open_arg = "w";
open_arg = "a";
dump_name = concat (dump_base_name, seq,
dump_file[index].extension, NULL);
rtl_dump_file = fopen (dump_name, open_arg);
if (rtl_dump_file == NULL)
fatal_io_error ("can't open %s", dump_name);
free (dump_name);
if (decl)
fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
(*lang_hooks.decl_printable_name) (decl, 2),
cfun->function_frequency == FUNCTION_FREQUENCY_HOT
? " (hot)"
: cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
? " (unlikely executed)"
: "");
timevar_pop (TV_DUMP);
return 1;
/* Routine to close a dump file. */
static void
close_dump_file (index, func, insns)
enum dump_file_index index;
void (*func) PARAMS ((FILE *, rtx));
rtx insns;
if (! rtl_dump_file)
timevar_push (TV_DUMP);
if (insns
&& graph_dump_format != no_graph
&& dump_file[index].graph_dump_p)
char seq[16];
char *suffix;
sprintf (seq, DUMPFILE_FORMAT, index);
suffix = concat (seq, dump_file[index].extension, NULL);
print_rtl_graph_with_bb (dump_base_name, suffix, insns);
free (suffix);
if (func && insns)
func (rtl_dump_file, insns);
fflush (rtl_dump_file);
fclose (rtl_dump_file);
rtl_dump_file = NULL;
timevar_pop (TV_DUMP);
/* 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. */
wrapup_global_declarations (vec, len)
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)
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. */
reconsider = 0;
for (i = 0; i < len; i++)
decl = vec[i];
if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
/* 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))
bool needed = 1;
/* needed */;
else if (DECL_COMDAT (decl))
needed = 0;
else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
&& (optimize || !flag_keep_static_consts
needed = 0;
if (needed)
reconsider = 1;
rest_of_decl_compilation (decl, NULL, 1, 1);
&& DECL_INITIAL (decl) != 0
&& DECL_SAVED_INSNS (decl) != 0
&& (flag_keep_inline_functions
|| (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
reconsider = 1;
output_inline_function (decl);
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. */
check_global_declarations (vec, len)
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. */
/* 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. */
&& (warn_unused_function
&& DECL_INITIAL (decl) == 0
&& ! TREE_PUBLIC (decl))
pedwarn_with_decl (decl,
"`%s' used but never defined");
warning_with_decl (decl,
"`%s' declared `static' but never defined");
/* 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)))
&& ! 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)
/* 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_with_decl (decl, "`%s' defined but not used");
/* 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);
/* Save the current INPUT_FILENAME and LINENO on the top entry in the
INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
INPUT_FILENAME and LINENO accordingly. */
push_srcloc (file, line)
const char *file;
int line;
struct file_stack *fs;
if (input_file_stack)
input_file_stack->name = input_filename;
input_file_stack->line = lineno;
fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
fs->name = input_filename = file;
fs->line = lineno = line;
fs->next = input_file_stack;
input_file_stack = fs;
/* Pop the top entry off the stack of presently open source files.
Restore the INPUT_FILENAME and LINENO from the new topmost entry on
the stack. */
pop_srcloc ()
struct file_stack *fs;
fs = input_file_stack;
input_file_stack = fs->next;
free (fs);
/* The initial source file is never popped. */
if (!input_file_stack)
abort ();
input_filename = input_file_stack->name;
lineno = input_file_stack->line;
/* Compile an entire translation unit. Write a file of assembly
output and various debugging dumps. */
static void
compile_file ()
/* Initialize yet another pass. */
init_final (main_input_filename);
init_branch_prob (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)
/* This must occur after the loop to output deferred functions. Else
the profiler initializer would not be emitted if all the functions
in this compilation unit were deferred.
output_func_start_profiler can not cause any additional functions or
data to need to be output, so it need not be in the deferred function
loop above. */
output_func_start_profiler ();
/* Write out any pending weak symbol declarations. */
weak_finish ();
/* Do dbx symbols. */
timevar_push (TV_SYMOUT);
if (dwarf2out_do_frame ())
dwarf2out_frame_finish ();
(*debug_hooks->finish) (main_input_filename);
timevar_pop (TV_SYMOUT);
/* Output some stuff at end of file if nec. */
dw2_output_indirect_constants ();
end_final (aux_base_name);
if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
timevar_push (TV_DUMP);
open_dump_file (DFI_bp, NULL);
end_branch_prob ();
close_dump_file (DFI_bp, NULL, NULL_RTX);
timevar_pop (TV_DUMP);
ASM_FILE_END (asm_out_file);
/* 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. */
if (!flag_no_ident)
fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
IDENT_ASM_OP, version_string);
if (optimize > 0 && open_dump_file (DFI_combine, NULL))
timevar_push (TV_DUMP);
dump_combine_total_stats (rtl_dump_file);
close_dump_file (DFI_combine, NULL, NULL_RTX);
timevar_pop (TV_DUMP);
/* This is called from various places for FUNCTION_DECL, VAR_DECL,
and TYPE_DECL nodes.
This does nothing for local (non-static) variables, unless the
variable is a register variable with an ASMSPEC. In that case, or
if the variable is not an automatic, it sets up the RTL and
outputs any assembler code (label definition, storage allocation
and initialization).
DECL is the declaration. If ASMSPEC is nonzero, it specifies
the assembler symbol name to be used. TOP_LEVEL is nonzero
if this declaration is not within a function. */
rest_of_decl_compilation (decl, asmspec, top_level, at_end)
tree decl;
const char *asmspec;
int top_level;
int at_end;
/* Declarations of variables, and of functions defined elsewhere. */
/* The most obvious approach, to put an #ifndef around where
this macro is used, doesn't work since it's inside a macro call. */
/* We deferred calling assemble_alias so that we could collect
other attributes such as visibility. Emit the alias now. */
tree alias;
alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
if (alias)
alias = TREE_VALUE (TREE_VALUE (alias));
alias = get_identifier (TREE_STRING_POINTER (alias));
assemble_alias (decl, alias);
/* Forward declarations for nested functions are not "external",
but we need to treat them as if they were. */
if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
timevar_push (TV_VARCONST);
if (asmspec)
make_decl_rtl (decl, asmspec);
/* Don't output anything when a tentative file-scope definition
is seen. But at end of compilation, do output code for them. */
if (at_end || !DECL_DEFER_OUTPUT (decl))
assemble_variable (decl, top_level, at_end, 0);
if (decl == last_assemble_variable_decl)
ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
top_level, at_end);
timevar_pop (TV_VARCONST);
else if (DECL_REGISTER (decl) && asmspec != 0)
if (decode_reg_name (asmspec) >= 0)
make_decl_rtl (decl, asmspec);
error ("invalid register name `%s' for register variable", asmspec);
DECL_REGISTER (decl) = 0;
if (!top_level)
expand_decl (decl);
else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
&& TREE_CODE (decl) == TYPE_DECL)
timevar_push (TV_SYMOUT);
dbxout_symbol (decl, 0);
timevar_pop (TV_SYMOUT);
else if (write_symbols == SDB_DEBUG && top_level
&& TREE_CODE (decl) == TYPE_DECL)
timevar_push (TV_SYMOUT);
sdbout_symbol (decl, 0);
timevar_pop (TV_SYMOUT);
else if ((write_symbols == DWARF2_DEBUG
|| write_symbols == VMS_AND_DWARF2_DEBUG)
&& top_level
&& TREE_CODE (decl) == TYPE_DECL)
timevar_push (TV_SYMOUT);
dwarf2out_decl (decl);
timevar_pop (TV_SYMOUT);
/* Called after finishing a record, union or enumeral type. */
rest_of_type_compilation (type, toplev)
tree type;
int toplev;
/* Avoid confusing the debug information machinery when there are
errors. */
if (errorcount != 0 || sorrycount != 0)
timevar_push (TV_SYMOUT);
if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
if (write_symbols == SDB_DEBUG)
sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
if ((write_symbols == DWARF2_DEBUG
|| write_symbols == VMS_AND_DWARF2_DEBUG)
&& toplev)
dwarf2out_decl (TYPE_STUB_DECL (type));
timevar_pop (TV_SYMOUT);
/* This is called from finish_function (within langhooks.parse_file)
after each top-level definition is parsed.
It is supposed to compile that function or variable
and output the assembler code for it.
After we return, the tree storage is freed. */
rest_of_compilation (decl)
tree decl;
rtx insns;
int tem;
int failure = 0;
int rebuild_label_notes_after_reload;
int register_life_up_to_date;
timevar_push (TV_REST_OF_COMPILATION);
/* Now that we're out of the frontend, we shouldn't have any more
CONCATs anywhere. */
generating_concat_p = 0;
/* When processing delayed functions, prepare_function_start() won't
have been run to re-initialize it. */
cse_not_expected = ! optimize;
/* First, make sure that NOTE_BLOCK is set correctly for each
if (!cfun->x_whole_function_mode_p)
identify_blocks ();
/* In function-at-a-time mode, we do not attempt to keep the BLOCK
tree in sensible shape. So, we just recalculate it here. */
if (cfun->x_whole_function_mode_p)
reorder_blocks ();
init_flow ();
/* If we are reconsidering an inline function
at the end of compilation, skip the stuff for making it inline. */
if (DECL_SAVED_INSNS (decl) == 0)
int inlinable = 0;
tree parent;
const char *lose;
/* If this is nested inside an inlined external function, pretend
it was only declared. Since we cannot inline such functions,
generating code for this one is not only not necessary but will
confuse some debugging output writers. */
for (parent = DECL_CONTEXT (current_function_decl);
parent != NULL_TREE;
parent = get_containing_scope (parent))
&& DECL_INLINE (parent) && DECL_EXTERNAL (parent))
DECL_INITIAL (decl) = 0;
goto exit_rest_of_compilation;
else if (TYPE_P (parent))
/* A function in a local class should be treated normally. */
/* If requested, consider whether to make this function inline. */
if ((DECL_INLINE (decl) && !flag_no_inline)
|| flag_inline_functions)
timevar_push (TV_INTEGRATION);
lose = function_cannot_inline_p (decl);
timevar_pop (TV_INTEGRATION);
if (lose || ! optimize)
if (warn_inline && DECL_INLINE (decl))
warning_with_decl (decl, lose);
/* Don't really compile an extern inline function.
If we can't make it inline, pretend
it was only declared. */
if (DECL_EXTERNAL (decl))
DECL_INITIAL (decl) = 0;
goto exit_rest_of_compilation;
/* ??? Note that we used to just make it look like if
the "inline" keyword was specified when we decide
to inline it (because of -finline-functions).
garloff at suse dot de, 2002-04-24: Add another flag to
actually record this piece of information. */
if (!DECL_INLINE (decl))
DID_INLINE_FUNC (decl) = 1;
inlinable = DECL_INLINE (decl) = 1;
insns = get_insns ();
/* Dump the rtl code if we are dumping rtl. */
if (open_dump_file (DFI_rtl, decl))
if (DECL_SAVED_INSNS (decl))
fprintf (rtl_dump_file, ";; (integrable)\n\n");
close_dump_file (DFI_rtl, print_rtl, insns);
/* Convert from NOTE_INSN_EH_REGION style notes, and do other
sorts of eh initialization. Delay this until after the
initial rtl dump so that we can see the original nesting. */
convert_from_eh_region_ranges ();
/* If function is inline, and we don't yet know whether to
compile it by itself, defer decision till end of compilation.
wrapup_global_declarations will (indirectly) call
rest_of_compilation again for those functions that need to
be output. Also defer those functions that we are supposed
to defer. */
if (inlinable
|| (DECL_INLINE (decl)
&& ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
&& ! flag_keep_inline_functions)
|| DECL_EXTERNAL (decl))))
if (DECL_INLINE (decl))
/* DWARF wants separate debugging info for abstract and
concrete instances of all inline functions, including those
declared inline but not inlined, and those inlined even
though they weren't declared inline. Conveniently, that's
what DECL_INLINE means at this point. */
(*debug_hooks->deferred_inline_function) (decl);
/* If -Wreturn-type, we have to do a bit of compilation. We just
want to call cleanup the cfg to figure out whether or not we can
fall off the end of the function; we do the minimum amount of
work necessary to make that safe. */
if (warn_return_type)
int saved_optimize = optimize;
optimize = 0;
rebuild_jump_labels (insns);
find_exception_handler_labels ();
find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
optimize = saved_optimize;
/* CFG is no longer maintained up-to-date. */
free_bb_for_insn ();
set_nothrow_function_flags ();
if (current_function_nothrow)
/* Now we know that this can't throw; set the flag for the benefit
of other functions later in this translation unit. */
TREE_NOTHROW (current_function_decl) = 1;
timevar_push (TV_INTEGRATION);
save_for_inline (decl);
timevar_pop (TV_INTEGRATION);
DECL_SAVED_INSNS (decl)->inlinable = inlinable;
goto exit_rest_of_compilation;
/* If specified extern inline but we aren't inlining it, we are
done. This goes for anything that gets here with DECL_EXTERNAL
set, not just things with DECL_INLINE. */
if (DECL_EXTERNAL (decl))
goto exit_rest_of_compilation;
/* If we're emitting a nested function, make sure its parent gets
emitted as well. Doing otherwise confuses debug info. */
tree parent;
for (parent = DECL_CONTEXT (current_function_decl);
parent != NULL_TREE;
parent = get_containing_scope (parent))
if (TREE_CODE (parent) == FUNCTION_DECL)
/* We are now committed to emitting code for this function. Do any
preparation, such as emitting abstract debug info for the inline
before it gets mangled by optimization. */
if (DECL_INLINE (decl))
(*debug_hooks->outlining_inline_function) (decl);
/* Remove any notes we don't need. That will make iterating
over the instruction sequence faster, and allow the garbage
collector to reclaim the memory used by the notes. */
remove_unnecessary_notes ();
reorder_blocks ();
ggc_collect ();
/* Initialize some variables used by the optimizers. */
init_function_for_compilation ();
if (! DECL_DEFER_OUTPUT (decl))
TREE_ASM_WRITTEN (decl) = 1;
/* Now that integrate will no longer see our rtl, we need not
distinguish between the return value of this function and the
return value of called functions. Also, we can remove all SETs
of subregs of hard registers; they are only here because of
integrate. Also, we can now initialize pseudos intended to
carry magic hard reg data throughout the function. */
rtx_equal_function_value_matters = 0;
purge_hard_subreg_sets (get_insns ());
/* Early return if there were errors. We can run afoul of our
consistency checks, and there's not really much point in fixing them.
Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
|| errorcount || sorrycount)
goto exit_rest_of_compilation;
timevar_push (TV_JUMP);
open_dump_file (DFI_sibling, decl);
insns = get_insns ();
rebuild_jump_labels (insns);
find_exception_handler_labels ();
find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
delete_unreachable_blocks ();
/* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
if (flag_guess_branch_prob)
timevar_push (TV_BRANCH_PROB);
note_prediction_to_br_prob ();
timevar_pop (TV_BRANCH_PROB);
/* We may have potential sibling or tail recursion sites. Select one
(of possibly multiple) methods of performing the call. */
if (flag_optimize_sibling_calls)
rtx insn;
optimize_sibling_and_tail_recursive_calls ();
/* Recompute the CFG as sibling optimization clobbers it randomly. */
free_bb_for_insn ();
find_exception_handler_labels ();
rebuild_jump_labels (insns);
find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
/* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
notes before simplifying cfg and we must do lowering after sibcall
that unhides parts of RTL chain and cleans up the CFG.
Until sibcall is replaced by tree-level optimizer, lets just
sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
if (GET_CODE (insn) == NOTE
delete_insn (insn);
close_dump_file (DFI_sibling, print_rtl, get_insns ());
/* We have to issue these warnings now already, because CFG cleanups
further down may destroy the required information. However, this
must be done after the sibcall optimization pass because the barrier
emitted for noreturn calls that are candidate for the optimization
is folded into the CALL_PLACEHOLDER until after this pass, so the
CFG is inaccurate. */
check_function_return_warnings ();
timevar_pop (TV_JUMP);
scope_to_insns_initialize ();
/* Complete generation of exception handling code. */
if (doing_eh (0))
timevar_push (TV_JUMP);
open_dump_file (DFI_eh, decl);
finish_eh_generation ();
close_dump_file (DFI_eh, print_rtl, get_insns ());
timevar_pop (TV_JUMP);
/* Delay emitting hard_reg_initial_value sets until after EH landing pad
generation, which might create new sets. */
emit_initial_value_sets ();
/* If we are doing position-independent code generation, now
is the time to output special prologues and epilogues.
We do not want to do this earlier, because it just clutters
up inline functions with meaningless insns. */
if (flag_pic)
insns = get_insns ();
/* Copy any shared structure that should not be shared. */
unshare_all_rtl (current_function_decl, insns);
/* This must be performed before virtual register instantiation.
Please be aware the everything in the compiler that can look
at the RTL up to this point must understand that REG_SAVE_AREA
is just like a use of the REG contained inside. */
if (current_function_calls_alloca)
optimize_save_area_alloca (insns);
/* Instantiate all virtual registers. */
instantiate_virtual_regs (current_function_decl, insns);
open_dump_file (DFI_jump, decl);
/* Always do one jump optimization pass to ensure that JUMP_LABEL fields
are initialized and to compute whether control can drop off the end
of the function. */
timevar_push (TV_JUMP);
before jump optimization switches branch directions. */
if (flag_guess_branch_prob)
expected_value_to_br_prob ();
reg_scan (insns, max_reg_num (), 0);
rebuild_jump_labels (insns);
find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
delete_trivially_dead_insns (insns, max_reg_num ());
if (rtl_dump_file)
dump_flow_info (rtl_dump_file);
cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
| (flag_thread_jumps ? CLEANUP_THREADING : 0));
/* CFG is no longer maintained up-to-date. */
if (optimize)
free_bb_for_insn ();
copy_loop_headers (insns);
find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
purge_line_number_notes (insns);
timevar_pop (TV_JUMP);
close_dump_file (DFI_jump, print_rtl, insns);
/* Now is when we stop if -fsyntax-only and -Wreturn-type. */
if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
goto exit_rest_of_compilation;
/* Long term, this should probably move before the jump optimizer too,
but I didn't want to disturb the rtl_dump_and_exit and related
stuff at this time. */
if (optimize > 0 && flag_ssa)
/* Convert to SSA form. */
timevar_push (TV_TO_SSA);
open_dump_file (DFI_ssa, decl);
convert_to_ssa ();
close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
timevar_pop (TV_TO_SSA);
/* Perform sparse conditional constant propagation, if requested. */
if (flag_ssa_ccp)
timevar_push (TV_SSA_CCP);
open_dump_file (DFI_ssa_ccp, decl);
ssa_const_prop ();
close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
timevar_pop (TV_SSA_CCP);
/* It would be useful to cleanup the CFG at this point, but block
merging and possibly other transformations might leave a PHI
node in the middle of a basic block, which is a strict no-no. */
/* The SSA implementation uses basic block numbers in its phi
nodes. Thus, changing the control-flow graph or the basic
blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
may cause problems. */
if (flag_ssa_dce)
/* Remove dead code. */
timevar_push (TV_SSA_DCE);
open_dump_file (DFI_ssa_dce, decl);
insns = get_insns ();
ssa_eliminate_dead_code ();
close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
timevar_pop (TV_SSA_DCE);
/* Convert from SSA form. */
timevar_push (TV_FROM_SSA);
open_dump_file (DFI_ussa, decl);
convert_from_ssa ();
/* New registers have been created. Rescan their usage. */
reg_scan (insns, max_reg_num (), 1);
close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
timevar_pop (TV_FROM_SSA);
ggc_collect ();
timevar_push (TV_JUMP);
if (optimize)
/* Try to identify useless null pointer tests and delete them. */
if (flag_delete_null_pointer_checks)
open_dump_file (DFI_null, decl);
if (rtl_dump_file)
dump_flow_info (rtl_dump_file);
if (delete_null_pointer_checks (insns))
close_dump_file (DFI_null, print_rtl_with_bb, insns);
/* Jump optimization, and the removal of NULL pointer checks, may
have reduced the number of instructions substantially. CSE, and
future passes, allocate arrays whose dimensions involve the
maximum instruction UID, so if we can reduce the maximum UID
we'll save big on memory. */
renumber_insns (rtl_dump_file);
timevar_pop (TV_JUMP);
close_dump_file (DFI_jump, print_rtl_with_bb, insns);
ggc_collect ();
/* Perform common subexpression elimination.
Nonzero value from `cse_main' means that jumps were simplified
and some code may now be unreachable, so do
jump optimization again. */
if (optimize > 0)
open_dump_file (DFI_cse, decl);
if (rtl_dump_file)
dump_flow_info (rtl_dump_file);
timevar_push (TV_CSE);
reg_scan (insns, max_reg_num (), 1);
tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
if (tem)
rebuild_jump_labels (insns);
if (purge_all_dead_edges (0))
delete_unreachable_blocks ();
delete_trivially_dead_insns (insns, max_reg_num ());
/* If we are not running more CSE passes, then we are no longer
expecting CSE to be run. But always rerun it in a cheap mode. */
cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
if (tem || optimize > 1)
/* Try to identify useless null pointer tests and delete them. */
if (flag_delete_null_pointer_checks)
timevar_push (TV_JUMP);
if (delete_null_pointer_checks (insns))
timevar_pop (TV_JUMP);
/* The second pass of jump optimization is likely to have
removed a bunch more instructions. */
renumber_insns (rtl_dump_file);
timevar_pop (TV_CSE);
close_dump_file (DFI_cse, print_rtl_with_bb, insns);
open_dump_file (DFI_addressof, decl);
purge_addressof (insns);
if (optimize && purge_all_dead_edges (0))
delete_unreachable_blocks ();
reg_scan (insns, max_reg_num (), 1);
close_dump_file (DFI_addressof, print_rtl, insns);
ggc_collect ();
/* Perform global cse. */
if (optimize > 0 && flag_gcse)
int save_csb, save_cfj;
int tem2 = 0;
timevar_push (TV_GCSE);
open_dump_file (DFI_gcse, decl);
tem = gcse_main (insns, rtl_dump_file);
rebuild_jump_labels (insns);
delete_trivially_dead_insns (insns, max_reg_num ());
save_csb = flag_cse_skip_blocks;
save_cfj = flag_cse_follow_jumps;
flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
/* If -fexpensive-optimizations, re-run CSE to clean up things done
by gcse. */
if (flag_expensive_optimizations)
timevar_push (TV_CSE);
reg_scan (insns, max_reg_num (), 1);
tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
purge_all_dead_edges (0);
delete_trivially_dead_insns (insns, max_reg_num ());
timevar_pop (TV_CSE);
cse_not_expected = !flag_rerun_cse_after_loop;
/* If gcse or cse altered any jumps, rerun jump optimizations to clean
things up. Then possibly re-run CSE again. */
while (tem || tem2)
tem = tem2 = 0;
timevar_push (TV_JUMP);
rebuild_jump_labels (insns);
timevar_pop (TV_JUMP);
if (flag_expensive_optimizations)
timevar_push (TV_CSE);
reg_scan (insns, max_reg_num (), 1);
tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
purge_all_dead_edges (0);
delete_trivially_dead_insns (insns, max_reg_num ());
timevar_pop (TV_CSE);
close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
timevar_pop (TV_GCSE);
ggc_collect ();
flag_cse_skip_blocks = save_csb;
flag_cse_follow_jumps = save_cfj;
verify_flow_info ();
/* Move constant computations out of loops. */
if (optimize > 0 && flag_loop_optimize)
int do_unroll, do_prefetch;
timevar_push (TV_LOOP);
delete_dead_jumptables ();
open_dump_file (DFI_loop, decl);
/* CFG is no longer maintained up-to-date. */
free_bb_for_insn ();
do_unroll = flag_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
if (flag_rerun_loop_opt)
cleanup_barriers ();
/* We only want to perform unrolling once. */
loop_optimize (insns, rtl_dump_file, do_unroll);
do_unroll = 0;
/* The first call to loop_optimize makes some instructions
trivially dead. We delete those instructions now in the
hope that doing so will make the heuristics in loop work
better and possibly speed up compilation. */
delete_trivially_dead_insns (insns, max_reg_num ());
/* The regscan pass is currently necessary as the alias
analysis code depends on this information. */
reg_scan (insns, max_reg_num (), 1);
cleanup_barriers ();
loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
/* Loop can create trivially dead instructions. */
delete_trivially_dead_insns (insns, max_reg_num ());
close_dump_file (DFI_loop, print_rtl, insns);
timevar_pop (TV_LOOP);
find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
ggc_collect ();
/* Do control and data flow analysis; wrote some of the results to
the dump file. */
timevar_push (TV_FLOW);
open_dump_file (DFI_cfg, decl);
if (rtl_dump_file)
dump_flow_info (rtl_dump_file);
if (optimize)
| (flag_thread_jumps ? CLEANUP_THREADING : 0));
/* It may make more sense to mark constant functions after dead code is
eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
may insert code making function non-constant, but we still must consider
it as constant, otherwise -fbranch-probabilities will not read data back.
life_analyzis rarely eliminates modification of external memory.
if (optimize)
mark_constant_function ();
close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
/* Do branch profiling and static profile estimation passes. */
if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
struct loops loops;
timevar_push (TV_BRANCH_PROB);
open_dump_file (DFI_bp, decl);
if (cfun->arc_profile || flag_branch_probabilities)
branch_prob ();
/* Discover and record the loop depth at the head of each basic
block. The loop infrastructure does the real job for us. */
flow_loops_find (&loops, LOOP_TREE);
if (rtl_dump_file)
flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
/* Estimate using heuristics if no profiling info is available. */
if (flag_guess_branch_prob)
estimate_probability (&loops);
flow_loops_free (&loops);
close_dump_file (DFI_bp, print_rtl_with_bb, insns);
timevar_pop (TV_BRANCH_PROB);
if (optimize > 0)
open_dump_file (DFI_ce1, decl);
if (flag_if_conversion)
timevar_push (TV_IFCVT);
if (rtl_dump_file)
dump_flow_info (rtl_dump_file);
cleanup_cfg (CLEANUP_EXPENSIVE);
reg_scan (insns, max_reg_num (), 0);
if_convert (0);
timevar_pop (TV_IFCVT);
timevar_push (TV_JUMP);
cleanup_cfg (CLEANUP_EXPENSIVE);
reg_scan (insns, max_reg_num (), 0);
timevar_pop (TV_JUMP);
close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
if (flag_tracer)
timevar_push (TV_TRACER);
open_dump_file (DFI_tracer, decl);
if (rtl_dump_file)
dump_flow_info (rtl_dump_file);
tracer ();
cleanup_cfg (CLEANUP_EXPENSIVE);
reg_scan (insns, max_reg_num (), 0);
close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
timevar_pop (TV_TRACER);
if (flag_rerun_cse_after_loop)
timevar_push (TV_CSE2);
open_dump_file (DFI_cse2, decl);
if (rtl_dump_file)
dump_flow_info (rtl_dump_file);
/* CFG is no longer maintained up-to-date. */
tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
/* Run a pass to eliminate duplicated assignments to condition
code registers. We have to run this after bypass_jumps,
because it makes it harder for that pass to determine whether
a jump can be bypassed safely. */
cse_condition_code_reg ();
purge_all_dead_edges (0);
delete_trivially_dead_insns (insns, max_reg_num ());
if (tem)
timevar_push (TV_JUMP);
rebuild_jump_labels (insns);
cleanup_cfg (CLEANUP_EXPENSIVE);
timevar_pop (TV_JUMP);
reg_scan (insns, max_reg_num (), 0);
close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
ggc_collect ();
timevar_pop (TV_CSE2);
cse_not_expected = 1;
open_dump_file (DFI_life, decl);
regclass_init ();
verify_flow_info ();
life_analysis (insns, rtl_dump_file, PROP_FINAL);
if (optimize)
cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
| (flag_thread_jumps ? CLEANUP_THREADING : 0));
timevar_pop (TV_FLOW);
if (warn_uninitialized || extra_warnings)
uninitialized_vars_warning (DECL_INITIAL (decl));
if (extra_warnings)
setjmp_args_warning ();
if (optimize)
if (!flag_new_regalloc && initialize_uninitialized_subregs ())
/* Insns were inserted, and possibly pseudos created, so
things might look a bit different. */
insns = get_insns ();
allocate_reg_life_data ();
no_new_pseudos = 1;
close_dump_file (DFI_life, print_rtl_with_bb, insns);
ggc_collect ();
/* If -opt, try combining insns through substitution. */
if (optimize > 0)
int rebuild_jump_labels_after_combine = 0;
timevar_push (TV_COMBINE);
open_dump_file (DFI_combine, decl);
= combine_instructions (insns, max_reg_num ());
/* Combining insns may have turned an indirect jump into a
direct jump. Rebuid the JUMP_LABEL fields of jumping
instructions. */
if (rebuild_jump_labels_after_combine)
timevar_push (TV_JUMP);
rebuild_jump_labels (insns);
timevar_pop (TV_JUMP);
close_dump_file (DFI_combine, print_rtl_with_bb, insns);
timevar_pop (TV_COMBINE);
ggc_collect ();
/* Rerun if-conversion, as combine may have simplified things enough to
now meet sequence length restrictions. */
if (flag_if_conversion)
timevar_push (TV_IFCVT);
open_dump_file (DFI_ce2, decl);
no_new_pseudos = 0;
if_convert (1);
no_new_pseudos = 1;
close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
timevar_pop (TV_IFCVT);
/* Register allocation pre-pass, to reduce number of moves
necessary for two-address machines. */
if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
timevar_push (TV_REGMOVE);
open_dump_file (DFI_regmove, decl);
regmove_optimize (insns, max_reg_num (), rtl_dump_file);
close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
timevar_pop (TV_REGMOVE);
ggc_collect ();
/* Do unconditional splitting before register allocation to allow machine
description to add extra information not needed previously. */
split_all_insns (1);
/* Any of the several passes since flow1 will have munged register
lifetime data a bit. */
register_life_up_to_date = 0;
timevar_push (TV_MODE_SWITCH);
no_new_pseudos = 0;
optimize_mode_switching (NULL);
no_new_pseudos = 1;
timevar_pop (TV_MODE_SWITCH);
timevar_push (TV_SCHED);
/* Print function header into sched dump now
because doing the sched analysis makes some of the dump. */
if (optimize > 0 && flag_schedule_insns)
open_dump_file (DFI_sched, decl);
/* Do control and data sched analysis,
and write some of the results to dump file. */
schedule_insns (rtl_dump_file);
close_dump_file (DFI_sched, print_rtl_with_bb, insns);
/* Register lifetime information was updated as part of verifying
the schedule. */
register_life_up_to_date = 1;
timevar_pop (TV_SCHED);
ggc_collect ();
/* Determine if the current function is a leaf before running reload
since this can impact optimizations done by the prologue and
epilogue thus changing register elimination offsets. */
current_function_is_leaf = leaf_function_p ();
timevar_push (TV_LOCAL_ALLOC);
open_dump_file (DFI_lreg, decl);
/* Allocate pseudo-regs that are used only within 1 basic block.
RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
jump optimizer after register allocation and reloading are finished. */
if (! register_life_up_to_date)
recompute_reg_usage (insns, ! optimize_size);
if (flag_new_regalloc)
delete_trivially_dead_insns (insns, max_reg_num ());
reg_alloc ();
timevar_pop (TV_LOCAL_ALLOC);
if (dump_file[DFI_lreg].enabled)
timevar_push (TV_DUMP);
close_dump_file (DFI_lreg, NULL, NULL);
timevar_pop (TV_DUMP);
/* XXX clean up the whole mess to bring live info in shape again. */
timevar_push (TV_GLOBAL_ALLOC);
open_dump_file (DFI_greg, decl);
build_insn_chain (insns);
failure = reload (insns, 0);
timevar_pop (TV_GLOBAL_ALLOC);
if (dump_file[DFI_greg].enabled)
timevar_push (TV_DUMP);
dump_global_regs (rtl_dump_file);
close_dump_file (DFI_greg, print_rtl_with_bb, insns);
timevar_pop (TV_DUMP);
if (failure)
goto exit_rest_of_compilation;
reload_completed = 1;
rebuild_label_notes_after_reload = 0;
/* Allocate the reg_renumber array. */
allocate_reg_info (max_regno, FALSE, TRUE);
/* And the reg_equiv_memory_loc array. */
reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
allocate_initial_values (reg_equiv_memory_loc);
regclass (insns, max_reg_num (), rtl_dump_file);
rebuild_label_notes_after_reload = local_alloc ();
timevar_pop (TV_LOCAL_ALLOC);
if (dump_file[DFI_lreg].enabled)
timevar_push (TV_DUMP);
dump_flow_info (rtl_dump_file);
dump_local_alloc (rtl_dump_file);
close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
timevar_pop (TV_DUMP);
ggc_collect ();
timevar_push (TV_GLOBAL_ALLOC);
open_dump_file (DFI_greg, decl);
/* If optimizing, allocate remaining pseudo-regs. Do the reload
pass fixing up any insns that are invalid. */
if (optimize)
failure = global_alloc (rtl_dump_file);
build_insn_chain (insns);
failure = reload (insns, 0);
timevar_pop (TV_GLOBAL_ALLOC);
if (dump_file[DFI_greg].enabled)
timevar_push (TV_DUMP);
dump_global_regs (rtl_dump_file);
close_dump_file (DFI_greg, print_rtl_with_bb, insns);
timevar_pop (TV_DUMP);
if (failure)
goto exit_rest_of_compilation;
ggc_collect ();
open_dump_file (DFI_postreload, decl);
/* Do a very simple CSE pass over just the hard registers. */
if (optimize > 0)