From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/except.h | 339 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 339 insertions(+) create mode 100644 gcc/except.h (limited to 'gcc/except.h') diff --git a/gcc/except.h b/gcc/except.h new file mode 100644 index 000000000..14eca870a --- /dev/null +++ b/gcc/except.h @@ -0,0 +1,339 @@ +/* Exception Handling interface routines. + Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, + 2007, 2008, 2009, 2010 Free Software Foundation, Inc. + Contributed by Mike Stump . + +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 3, 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 COPYING3. If not see +. */ + +/* No include guards here, but define an include file marker anyway, so + that the compiler can keep track of where this file is included. This + is e.g. used to avoid including this file in front-end specific files. */ +#ifndef GCC_EXCEPT_H +# define GCC_EXCEPT_H +#endif + +#include "hashtab.h" +#include "vecprim.h" +#include "vecir.h" + +struct function; +struct eh_region_d; +struct pointer_map_t; + +/* The type of an exception region. */ +enum eh_region_type +{ + /* CLEANUP regions implement e.g. destructors run when exiting a block. + They can be generated from both GIMPLE_TRY_FINALLY and GIMPLE_TRY_CATCH + nodes. It is expected by the runtime that cleanup regions will *not* + resume normal program flow, but will continue propagation of the + exception. */ + ERT_CLEANUP, + + /* TRY regions implement catching an exception. The list of types associated + with the attached catch handlers is examined in order by the runtime and + control is transfered to the appropriate handler. Note that a NULL type + list is a catch-all handler, and that it will catch *all* exceptions + including those originating from a different language. */ + ERT_TRY, + + /* ALLOWED_EXCEPTIONS regions implement exception filtering, e.g. the + throw(type-list) specification that can be added to C++ functions. + The runtime examines the thrown exception vs the type list, and if + the exception does not match, transfers control to the handler. The + normal handler for C++ calls __cxa_call_unexpected. */ + ERT_ALLOWED_EXCEPTIONS, + + /* MUST_NOT_THROW regions prevent all exceptions from propagating. This + region type is used in C++ to surround destructors being run inside a + CLEANUP region. This differs from an ALLOWED_EXCEPTIONS region with + an empty type list in that the runtime is prepared to terminate the + program directly. We only generate code for MUST_NOT_THROW regions + along control paths that are already handling an exception within the + current function. */ + ERT_MUST_NOT_THROW +}; + + +/* A landing pad for a given exception region. Any transfer of control + from the EH runtime to the function happens at a landing pad. */ + +struct GTY(()) eh_landing_pad_d +{ + /* The linked list of all landing pads associated with the region. */ + struct eh_landing_pad_d *next_lp; + + /* The region with which this landing pad is associated. */ + struct eh_region_d *region; + + /* At the gimple level, the location to which control will be transfered + for this landing pad. There can be both EH and normal edges into the + block containing the post-landing-pad label. */ + tree post_landing_pad; + + /* At the rtl level, the location to which the runtime will transfer + control. This differs from the post-landing-pad in that the target's + EXCEPTION_RECEIVER pattern will be expanded here, as well as other + bookkeeping specific to exceptions. There must not be normal edges + into the block containing the landing-pad label. */ + rtx landing_pad; + + /* The index of this landing pad within fun->eh->lp_array. */ + int index; +}; + +/* A catch handler associated with an ERT_TRY region. */ + +struct GTY(()) eh_catch_d +{ + /* The double-linked list of all catch handlers for the region. */ + struct eh_catch_d *next_catch; + struct eh_catch_d *prev_catch; + + /* A TREE_LIST of runtime type objects that this catch handler + will catch, or NULL if all exceptions are caught. */ + tree type_list; + + /* A TREE_LIST of INTEGER_CSTs that correspond to the type_list entries, + having been mapped by assign_filter_values. These integers are to be + compared against the __builtin_eh_filter value. */ + tree filter_list; + + /* The code that should be executed if this catch handler matches the + thrown exception. This label is only maintained until + pass_lower_eh_dispatch, at which point it is cleared. */ + tree label; +}; + +/* Describes one exception region. */ + +struct GTY(()) eh_region_d +{ + /* The immediately surrounding region. */ + struct eh_region_d *outer; + + /* The list of immediately contained regions. */ + struct eh_region_d *inner; + struct eh_region_d *next_peer; + + /* The index of this region within fun->eh->region_array. */ + int index; + + /* Each region does exactly one thing. */ + enum eh_region_type type; + + /* Holds the action to perform based on the preceding type. */ + union eh_region_u { + struct eh_region_u_try { + /* The double-linked list of all catch handlers for this region. */ + struct eh_catch_d *first_catch; + struct eh_catch_d *last_catch; + } GTY ((tag ("ERT_TRY"))) eh_try; + + struct eh_region_u_allowed { + /* A TREE_LIST of runtime type objects allowed to pass. */ + tree type_list; + /* The code that should be executed if the thrown exception does + not match the type list. This label is only maintained until + pass_lower_eh_dispatch, at which point it is cleared. */ + tree label; + /* The integer that will be passed by the runtime to signal that + we should execute the code at LABEL. This integer is assigned + by assign_filter_values and is to be compared against the + __builtin_eh_filter value. */ + int filter; + } GTY ((tag ("ERT_ALLOWED_EXCEPTIONS"))) allowed; + + struct eh_region_u_must_not_throw { + /* A function decl to be invoked if this region is actually reachable + from within the function, rather than implementable from the runtime. + The normal way for this to happen is for there to be a CLEANUP region + contained within this MUST_NOT_THROW region. Note that if the + runtime handles the MUST_NOT_THROW region, we have no control over + what termination function is called; it will be decided by the + personality function in effect for this CIE. */ + tree failure_decl; + /* The location assigned to the call of FAILURE_DECL, if expanded. */ + location_t failure_loc; + } GTY ((tag ("ERT_MUST_NOT_THROW"))) must_not_throw; + } GTY ((desc ("%0.type"))) u; + + /* The list of landing pads associated with this region. */ + struct eh_landing_pad_d *landing_pads; + + /* EXC_PTR and FILTER values copied from the runtime for this region. + Each region gets its own psuedos so that if there are nested exceptions + we do not overwrite the values of the first exception. */ + rtx exc_ptr_reg, filter_reg; + + /* True if this region should use __cxa_end_cleanup instead + of _Unwind_Resume. */ + bool use_cxa_end_cleanup; +}; + +typedef struct eh_landing_pad_d *eh_landing_pad; +typedef struct eh_catch_d *eh_catch; +typedef struct eh_region_d *eh_region; + +DEF_VEC_P(eh_region); +DEF_VEC_ALLOC_P(eh_region, gc); +DEF_VEC_ALLOC_P(eh_region, heap); + +DEF_VEC_P(eh_landing_pad); +DEF_VEC_ALLOC_P(eh_landing_pad, gc); + + +/* The exception status for each function. */ + +struct GTY(()) eh_status +{ + /* The tree of all regions for this function. */ + eh_region region_tree; + + /* The same information as an indexable array. */ + VEC(eh_region,gc) *region_array; + + /* The landing pads as an indexable array. */ + VEC(eh_landing_pad,gc) *lp_array; + + /* At the gimple level, a mapping from gimple statement to landing pad + or must-not-throw region. See record_stmt_eh_region. */ + htab_t GTY((param_is (struct throw_stmt_node))) throw_stmt_table; + + /* All of the runtime type data used by the function. These objects + are emitted to the lang-specific-data-area for the function. */ + VEC(tree,gc) *ttype_data; + + /* The table of all action chains. These encode the eh_region tree in + a compact form for use by the runtime, and is also emitted to the + lang-specific-data-area. Note that the ARM EABI uses a different + format for the encoding than all other ports. */ + union eh_status_u { + VEC(tree,gc) * GTY((tag ("1"))) arm_eabi; + VEC(uchar,gc) * GTY((tag ("0"))) other; + } GTY ((desc ("targetm.arm_eabi_unwinder"))) ehspec_data; +}; + + +/* Invokes CALLBACK for every exception handler label. Only used by old + loop hackery; should not be used by new code. */ +extern void for_each_eh_label (void (*) (rtx)); + +extern void init_eh_for_function (void); + +extern void remove_eh_landing_pad (eh_landing_pad); +extern void remove_eh_handler (eh_region); + +extern bool current_function_has_exception_handlers (void); +extern void output_function_exception_table (const char *); + +extern rtx expand_builtin_eh_pointer (tree); +extern rtx expand_builtin_eh_filter (tree); +extern rtx expand_builtin_eh_copy_values (tree); +extern void expand_builtin_unwind_init (void); +extern rtx expand_builtin_eh_return_data_regno (tree); +extern rtx expand_builtin_extract_return_addr (tree); +extern void expand_builtin_init_dwarf_reg_sizes (tree); +extern rtx expand_builtin_frob_return_addr (tree); +extern rtx expand_builtin_dwarf_sp_column (void); +extern void expand_builtin_eh_return (tree, tree); +extern void expand_eh_return (void); +extern rtx expand_builtin_extend_pointer (tree); + +typedef tree (*duplicate_eh_regions_map) (tree, void *); +extern struct pointer_map_t *duplicate_eh_regions + (struct function *, eh_region, int, duplicate_eh_regions_map, void *); + +extern void sjlj_emit_function_exit_after (rtx); + +extern eh_region gen_eh_region_cleanup (eh_region); +extern eh_region gen_eh_region_try (eh_region); +extern eh_region gen_eh_region_allowed (eh_region, tree); +extern eh_region gen_eh_region_must_not_throw (eh_region); + +extern eh_catch gen_eh_region_catch (eh_region, tree); +extern eh_landing_pad gen_eh_landing_pad (eh_region); + +extern eh_region get_eh_region_from_number_fn (struct function *, int); +extern eh_region get_eh_region_from_number (int); +extern eh_landing_pad get_eh_landing_pad_from_number_fn (struct function*,int); +extern eh_landing_pad get_eh_landing_pad_from_number (int); +extern eh_region get_eh_region_from_lp_number_fn (struct function *, int); +extern eh_region get_eh_region_from_lp_number (int); + +extern eh_region eh_region_outermost (struct function *, eh_region, eh_region); + +extern void make_reg_eh_region_note (rtx insn, int ecf_flags, int lp_nr); +extern void make_reg_eh_region_note_nothrow_nononlocal (rtx); + +extern void verify_eh_tree (struct function *); +extern void dump_eh_tree (FILE *, struct function *); +void debug_eh_tree (struct function *); +extern void add_type_for_runtime (tree); +extern tree lookup_type_for_runtime (tree); +extern void assign_filter_values (void); + +extern eh_region get_eh_region_from_rtx (const_rtx); +extern eh_landing_pad get_eh_landing_pad_from_rtx (const_rtx); + +struct GTY(()) throw_stmt_node { + gimple stmt; + int lp_nr; +}; + +extern struct htab *get_eh_throw_stmt_table (struct function *); +extern void set_eh_throw_stmt_table (struct function *, struct htab *); + +enum eh_personality_kind { + eh_personality_none, + eh_personality_any, + eh_personality_lang +}; + +extern enum eh_personality_kind +function_needs_eh_personality (struct function *); + +/* Pre-order iteration within the eh_region tree. */ + +static inline eh_region +ehr_next (eh_region r, eh_region start) +{ + if (r->inner) + r = r->inner; + else if (r->next_peer && r != start) + r = r->next_peer; + else + { + do + { + r = r->outer; + if (r == start) + return NULL; + } + while (r->next_peer == NULL); + r = r->next_peer; + } + return r; +} + +#define FOR_ALL_EH_REGION_AT(R, START) \ + for ((R) = (START); (R) != NULL; (R) = ehr_next (R, START)) + +#define FOR_ALL_EH_REGION_FN(R, FN) \ + for ((R) = (FN)->eh->region_tree; (R) != NULL; (R) = ehr_next (R, NULL)) + +#define FOR_ALL_EH_REGION(R) FOR_ALL_EH_REGION_FN (R, cfun) -- cgit v1.2.3