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/* Gimple IR support functions. Copyright 2007, 2008, 2009, 2010 Free Software Foundation, Inc. Contributed by Aldy Hernandez <aldyh@redhat.com> 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 <http://www.gnu.org/licenses/>. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "target.h" #include "tree.h" #include "ggc.h" #include "hard-reg-set.h" #include "basic-block.h" #include "gimple.h" #include "toplev.h" #include "diagnostic.h" #include "tree-flow.h" #include "value-prof.h" #include "flags.h" #include "alias.h" #include "demangle.h" /* Global type table. FIXME lto, it should be possible to re-use some of the type hashing routines in tree.c (type_hash_canon, type_hash_lookup, etc), but those assume that types were built with the various build_*_type routines which is not the case with the streamer. */ static htab_t gimple_types; static struct pointer_map_t *type_hash_cache; /* Global type comparison cache. */ static htab_t gtc_visited; static struct obstack gtc_ob; /* All the tuples have their operand vector (if present) at the very bottom of the structure. Therefore, the offset required to find the operands vector the size of the structure minus the size of the 1 element tree array at the end (see gimple_ops). */ #define DEFGSSTRUCT(SYM, STRUCT, HAS_TREE_OP) \ (HAS_TREE_OP ? sizeof (struct STRUCT) - sizeof (tree) : 0), EXPORTED_CONST size_t gimple_ops_offset_[] = { #include "gsstruct.def" }; #undef DEFGSSTRUCT #define DEFGSSTRUCT(SYM, STRUCT, HAS_TREE_OP) sizeof(struct STRUCT), static const size_t gsstruct_code_size[] = { #include "gsstruct.def" }; #undef DEFGSSTRUCT #define DEFGSCODE(SYM, NAME, GSSCODE) NAME, const char *const gimple_code_name[] = { #include "gimple.def" }; #undef DEFGSCODE #define DEFGSCODE(SYM, NAME, GSSCODE) GSSCODE, EXPORTED_CONST enum gimple_statement_structure_enum gss_for_code_[] = { #include "gimple.def" }; #undef DEFGSCODE #ifdef GATHER_STATISTICS /* Gimple stats. */ int gimple_alloc_counts[(int) gimple_alloc_kind_all]; int gimple_alloc_sizes[(int) gimple_alloc_kind_all]; /* Keep in sync with gimple.h:enum gimple_alloc_kind. */ static const char * const gimple_alloc_kind_names[] = { "assignments", "phi nodes", "conditionals", "sequences", "everything else" }; #endif /* GATHER_STATISTICS */ /* A cache of gimple_seq objects. Sequences are created and destroyed fairly often during gimplification. */ static GTY ((deletable)) struct gimple_seq_d *gimple_seq_cache; /* Private API manipulation functions shared only with some other files. */ extern void gimple_set_stored_syms (gimple, bitmap, bitmap_obstack *); extern void gimple_set_loaded_syms (gimple, bitmap, bitmap_obstack *); /* Gimple tuple constructors. Note: Any constructor taking a ``gimple_seq'' as a parameter, can be passed a NULL to start with an empty sequence. */ /* Set the code for statement G to CODE. */ static inline void gimple_set_code (gimple g, enum gimple_code code) { g->gsbase.code = code; } /* Return the number of bytes needed to hold a GIMPLE statement with code CODE. */ static inline size_t gimple_size (enum gimple_code code) { return gsstruct_code_size[gss_for_code (code)]; } /* Allocate memory for a GIMPLE statement with code CODE and NUM_OPS operands. */ gimple gimple_alloc_stat (enum gimple_code code, unsigned num_ops MEM_STAT_DECL) { size_t size; gimple stmt; size = gimple_size (code); if (num_ops > 0) size += sizeof (tree) * (num_ops - 1); #ifdef GATHER_STATISTICS { enum gimple_alloc_kind kind = gimple_alloc_kind (code); gimple_alloc_counts[(int) kind]++; gimple_alloc_sizes[(int) kind] += size; } #endif stmt = (gimple) ggc_alloc_cleared_stat (size PASS_MEM_STAT); gimple_set_code (stmt, code); gimple_set_num_ops (stmt, num_ops); /* Do not call gimple_set_modified here as it has other side effects and this tuple is still not completely built. */ stmt->gsbase.modified = 1; return stmt; } /* Set SUBCODE to be the code of the expression computed by statement G. */ static inline void gimple_set_subcode (gimple g, unsigned subcode) { /* We only have 16 bits for the RHS code. Assert that we are not overflowing it. */ gcc_assert (subcode < (1 << 16)); g->gsbase.subcode = subcode; } /* Build a tuple with operands. CODE is the statement to build (which must be one of the GIMPLE_WITH_OPS tuples). SUBCODE is the sub-code for the new tuple. NUM_OPS is the number of operands to allocate. */ #define gimple_build_with_ops(c, s, n) \ gimple_build_with_ops_stat (c, s, n MEM_STAT_INFO) static gimple gimple_build_with_ops_stat (enum gimple_code code, unsigned subcode, unsigned num_ops MEM_STAT_DECL) { gimple s = gimple_alloc_stat (code, num_ops PASS_MEM_STAT); gimple_set_subcode (s, subcode); return s; } /* Build a GIMPLE_RETURN statement returning RETVAL. */ gimple gimple_build_return (tree retval) { gimple s = gimple_build_with_ops (GIMPLE_RETURN, ERROR_MARK, 1); if (retval) gimple_return_set_retval (s, retval); return s; } /* Helper for gimple_build_call, gimple_build_call_vec and gimple_build_call_from_tree. Build the basic components of a GIMPLE_CALL statement to function FN with NARGS arguments. */ static inline gimple gimple_build_call_1 (tree fn, unsigned nargs) { gimple s = gimple_build_with_ops (GIMPLE_CALL, ERROR_MARK, nargs + 3); if (TREE_CODE (fn) == FUNCTION_DECL) fn = build_fold_addr_expr (fn); gimple_set_op (s, 1, fn); return s; } /* Build a GIMPLE_CALL statement to function FN with the arguments specified in vector ARGS. */ gimple gimple_build_call_vec (tree fn, VEC(tree, heap) *args) { unsigned i; unsigned nargs = VEC_length (tree, args); gimple call = gimple_build_call_1 (fn, nargs); for (i = 0; i < nargs; i++) gimple_call_set_arg (call, i, VEC_index (tree, args, i)); return call; } /* Build a GIMPLE_CALL statement to function FN. NARGS is the number of arguments. The ... are the arguments. */ gimple gimple_build_call (tree fn, unsigned nargs, ...) { va_list ap; gimple call; unsigned i; gcc_assert (TREE_CODE (fn) == FUNCTION_DECL || is_gimple_call_addr (fn)); call = gimple_build_call_1 (fn, nargs); va_start (ap, nargs); for (i = 0; i < nargs; i++) gimple_call_set_arg (call, i, va_arg (ap, tree)); va_end (ap); return call; } /* Build a GIMPLE_CALL statement from CALL_EXPR T. Note that T is assumed to be in GIMPLE form already. Minimal checking is done of this fact. */ gimple gimple_build_call_from_tree (tree t) { unsigned i, nargs; gimple call; tree fndecl = get_callee_fndecl (t); gcc_assert (TREE_CODE (t) == CALL_EXPR); nargs = call_expr_nargs (t); call = gimple_build_call_1 (fndecl ? fndecl : CALL_EXPR_FN (t), nargs); for (i = 0; i < nargs; i++) gimple_call_set_arg (call, i, CALL_EXPR_ARG (t, i)); gimple_set_block (call, TREE_BLOCK (t)); /* Carry all the CALL_EXPR flags to the new GIMPLE_CALL. */ gimple_call_set_chain (call, CALL_EXPR_STATIC_CHAIN (t)); gimple_call_set_tail (call, CALL_EXPR_TAILCALL (t)); gimple_call_set_cannot_inline (call, CALL_CANNOT_INLINE_P (t)); gimple_call_set_return_slot_opt (call, CALL_EXPR_RETURN_SLOT_OPT (t)); gimple_call_set_from_thunk (call, CALL_FROM_THUNK_P (t)); gimple_call_set_va_arg_pack (call, CALL_EXPR_VA_ARG_PACK (t)); gimple_call_set_nothrow (call, TREE_NOTHROW (t)); gimple_set_no_warning (call, TREE_NO_WARNING (t)); return call; } /* Extract the operands and code for expression EXPR into *SUBCODE_P, *OP1_P and *OP2_P respectively. */ void extract_ops_from_tree (tree expr, enum tree_code *subcode_p, tree *op1_p, tree *op2_p) { enum gimple_rhs_class grhs_class; *subcode_p = TREE_CODE (expr); grhs_class = get_gimple_rhs_class (*subcode_p); if (grhs_class == GIMPLE_BINARY_RHS) { *op1_p = TREE_OPERAND (expr, 0); *op2_p = TREE_OPERAND (expr, 1); } else if (grhs_class == GIMPLE_UNARY_RHS) { *op1_p = TREE_OPERAND (expr, 0); *op2_p = NULL_TREE; } else if (grhs_class == GIMPLE_SINGLE_RHS) { *op1_p = expr; *op2_p = NULL_TREE; } else gcc_unreachable (); } /* Build a GIMPLE_ASSIGN statement. LHS of the assignment. RHS of the assignment which can be unary or binary. */ gimple gimple_build_assign_stat (tree lhs, tree rhs MEM_STAT_DECL) { enum tree_code subcode; tree op1, op2; extract_ops_from_tree (rhs, &subcode, &op1, &op2); return gimple_build_assign_with_ops_stat (subcode, lhs, op1, op2 PASS_MEM_STAT); } /* Build a GIMPLE_ASSIGN statement with sub-code SUBCODE and operands OP1 and OP2. If OP2 is NULL then SUBCODE must be of class GIMPLE_UNARY_RHS or GIMPLE_SINGLE_RHS. */ gimple gimple_build_assign_with_ops_stat (enum tree_code subcode, tree lhs, tree op1, tree op2 MEM_STAT_DECL) { unsigned num_ops; gimple p; /* Need 1 operand for LHS and 1 or 2 for the RHS (depending on the code). */ num_ops = get_gimple_rhs_num_ops (subcode) + 1; p = gimple_build_with_ops_stat (GIMPLE_ASSIGN, (unsigned)subcode, num_ops PASS_MEM_STAT); gimple_assign_set_lhs (p, lhs); gimple_assign_set_rhs1 (p, op1); if (op2) { gcc_assert (num_ops > 2); gimple_assign_set_rhs2 (p, op2); } return p; } /* Build a new GIMPLE_ASSIGN tuple and append it to the end of *SEQ_P. DST/SRC are the destination and source respectively. You can pass ungimplified trees in DST or SRC, in which case they will be converted to a gimple operand if necessary. This function returns the newly created GIMPLE_ASSIGN tuple. */ gimple gimplify_assign (tree dst, tree src, gimple_seq *seq_p) { tree t = build2 (MODIFY_EXPR, TREE_TYPE (dst), dst, src); gimplify_and_add (t, seq_p); ggc_free (t); return gimple_seq_last_stmt (*seq_p); } /* Build a GIMPLE_COND statement. PRED is the condition used to compare LHS and the RHS. T_LABEL is the label to jump to if the condition is true. F_LABEL is the label to jump to otherwise. */ gimple gimple_build_cond (enum tree_code pred_code, tree lhs, tree rhs, tree t_label, tree f_label) { gimple p; gcc_assert (TREE_CODE_CLASS (pred_code) == tcc_comparison); p = gimple_build_with_ops (GIMPLE_COND, pred_code, 4); gimple_cond_set_lhs (p, lhs); gimple_cond_set_rhs (p, rhs); gimple_cond_set_true_label (p, t_label); gimple_cond_set_false_label (p, f_label); return p; } /* Extract operands for a GIMPLE_COND statement out of COND_EXPR tree COND. */ void gimple_cond_get_ops_from_tree (tree cond, enum tree_code *code_p, tree *lhs_p, tree *rhs_p) { location_t loc = EXPR_LOCATION (cond); gcc_assert (TREE_CODE_CLASS (TREE_CODE (cond)) == tcc_comparison || TREE_CODE (cond) == TRUTH_NOT_EXPR || is_gimple_min_invariant (cond) || SSA_VAR_P (cond)); extract_ops_from_tree (cond, code_p, lhs_p, rhs_p); /* Canonicalize conditionals of the form 'if (!VAL)'. */ if (*code_p == TRUTH_NOT_EXPR) { *code_p = EQ_EXPR; gcc_assert (*lhs_p && *rhs_p == NULL_TREE); *rhs_p = fold_convert_loc (loc, TREE_TYPE (*lhs_p), integer_zero_node); } /* Canonicalize conditionals of the form 'if (VAL)' */ else if (TREE_CODE_CLASS (*code_p) != tcc_comparison) { *code_p = NE_EXPR; gcc_assert (*lhs_p && *rhs_p == NULL_TREE); *rhs_p = fold_convert_loc (loc, TREE_TYPE (*lhs_p), integer_zero_node); } } /* Build a GIMPLE_COND statement from the conditional expression tree COND. T_LABEL and F_LABEL are as in gimple_build_cond. */ gimple gimple_build_cond_from_tree (tree cond, tree t_label, tree f_label) { enum tree_code code; tree lhs, rhs; gimple_cond_get_ops_from_tree (cond, &code, &lhs, &rhs); return gimple_build_cond (code, lhs, rhs, t_label, f_label); } /* Set code, lhs, and rhs of a GIMPLE_COND from a suitable boolean expression tree COND. */ void gimple_cond_set_condition_from_tree (gimple stmt, tree cond) { enum tree_code code; tree lhs, rhs; gimple_cond_get_ops_from_tree (cond, &code, &lhs, &rhs); gimple_cond_set_condition (stmt, code, lhs, rhs); } /* Build a GIMPLE_LABEL statement for LABEL. */ gimple gimple_build_label (tree label) { gimple p = gimple_build_with_ops (GIMPLE_LABEL, ERROR_MARK, 1); gimple_label_set_label (p, label); return p; } /* Build a GIMPLE_GOTO statement to label DEST. */ gimple gimple_build_goto (tree dest) { gimple p = gimple_build_with_ops (GIMPLE_GOTO, ERROR_MARK, 1); gimple_goto_set_dest (p, dest); return p; } /* Build a GIMPLE_NOP statement. */ gimple gimple_build_nop (void) { return gimple_alloc (GIMPLE_NOP, 0); } /* Build a GIMPLE_BIND statement. VARS are the variables in BODY. BLOCK is the containing block. */ gimple gimple_build_bind (tree vars, gimple_seq body, tree block) { gimple p = gimple_alloc (GIMPLE_BIND, 0); gimple_bind_set_vars (p, vars); if (body) gimple_bind_set_body (p, body); if (block) gimple_bind_set_block (p, block); return p; } /* Helper function to set the simple fields of a asm stmt. STRING is a pointer to a string that is the asm blocks assembly code. NINPUT is the number of register inputs. NOUTPUT is the number of register outputs. NCLOBBERS is the number of clobbered registers. */ static inline gimple gimple_build_asm_1 (const char *string, unsigned ninputs, unsigned noutputs, unsigned nclobbers, unsigned nlabels) { gimple p; int size = strlen (string); /* ASMs with labels cannot have outputs. This should have been enforced by the front end. */ gcc_assert (nlabels == 0 || noutputs == 0); p = gimple_build_with_ops (GIMPLE_ASM, ERROR_MARK, ninputs + noutputs + nclobbers + nlabels); p->gimple_asm.ni = ninputs; p->gimple_asm.no = noutputs; p->gimple_asm.nc = nclobbers; p->gimple_asm.nl = nlabels; p->gimple_asm.string = ggc_alloc_string (string, size); #ifdef GATHER_STATISTICS gimple_alloc_sizes[(int) gimple_alloc_kind (GIMPLE_ASM)] += size; #endif return p; } /* Build a GIMPLE_ASM statement. STRING is the assembly code. NINPUT is the number of register inputs. NOUTPUT is the number of register outputs. NCLOBBERS is the number of clobbered registers. INPUTS is a vector of the input register parameters. OUTPUTS is a vector of the output register parameters. CLOBBERS is a vector of the clobbered register parameters. LABELS is a vector of destination labels. */ gimple gimple_build_asm_vec (const char *string, VEC(tree,gc)* inputs, VEC(tree,gc)* outputs, VEC(tree,gc)* clobbers, VEC(tree,gc)* labels) { gimple p; unsigned i; p = gimple_build_asm_1 (string, VEC_length (tree, inputs), VEC_length (tree, outputs), VEC_length (tree, clobbers), VEC_length (tree, labels)); for (i = 0; i < VEC_length (tree, inputs); i++) gimple_asm_set_input_op (p, i, VEC_index (tree, inputs, i)); for (i = 0; i < VEC_length (tree, outputs); i++) gimple_asm_set_output_op (p, i, VEC_index (tree, outputs, i)); for (i = 0; i < VEC_length (tree, clobbers); i++) gimple_asm_set_clobber_op (p, i, VEC_index (tree, clobbers, i)); for (i = 0; i < VEC_length (tree, labels); i++) gimple_asm_set_label_op (p, i, VEC_index (tree, labels, i)); return p; } /* Build a GIMPLE_CATCH statement. TYPES are the catch types. HANDLER is the exception handler. */ gimple gimple_build_catch (tree types, gimple_seq handler) { gimple p = gimple_alloc (GIMPLE_CATCH, 0); gimple_catch_set_types (p, types); if (handler) gimple_catch_set_handler (p, handler); return p; } /* Build a GIMPLE_EH_FILTER statement. TYPES are the filter's types. FAILURE is the filter's failure action. */ gimple gimple_build_eh_filter (tree types, gimple_seq failure) { gimple p = gimple_alloc (GIMPLE_EH_FILTER, 0); gimple_eh_filter_set_types (p, types); if (failure) gimple_eh_filter_set_failure (p, failure); return p; } /* Build a GIMPLE_EH_MUST_NOT_THROW statement. */ gimple gimple_build_eh_must_not_throw (tree decl) { gimple p = gimple_alloc (GIMPLE_EH_MUST_NOT_THROW, 0); gcc_assert (TREE_CODE (decl) == FUNCTION_DECL); gcc_assert (flags_from_decl_or_type (decl) & ECF_NORETURN); gimple_eh_must_not_throw_set_fndecl (p, decl); return p; } /* Build a GIMPLE_TRY statement. EVAL is the expression to evaluate. CLEANUP is the cleanup expression. KIND is either GIMPLE_TRY_CATCH or GIMPLE_TRY_FINALLY depending on whether this is a try/catch or a try/finally respectively. */ gimple gimple_build_try (gimple_seq eval, gimple_seq cleanup, enum gimple_try_flags kind) { gimple p; gcc_assert (kind == GIMPLE_TRY_CATCH || kind == GIMPLE_TRY_FINALLY); p = gimple_alloc (GIMPLE_TRY, 0); gimple_set_subcode (p, kind); if (eval) gimple_try_set_eval (p, eval); if (cleanup) gimple_try_set_cleanup (p, cleanup); return p; } /* Construct a GIMPLE_WITH_CLEANUP_EXPR statement. CLEANUP is the cleanup expression. */ gimple gimple_build_wce (gimple_seq cleanup) { gimple p = gimple_alloc (GIMPLE_WITH_CLEANUP_EXPR, 0); if (cleanup) gimple_wce_set_cleanup (p, cleanup); return p; } /* Build a GIMPLE_RESX statement. */ gimple gimple_build_resx (int region) { gimple p = gimple_build_with_ops (GIMPLE_RESX, ERROR_MARK, 0); p->gimple_eh_ctrl.region = region; return p; } /* The helper for constructing a gimple switch statement. INDEX is the switch's index. NLABELS is the number of labels in the switch excluding the default. DEFAULT_LABEL is the default label for the switch statement. */ gimple gimple_build_switch_nlabels (unsigned nlabels, tree index, tree default_label) { /* nlabels + 1 default label + 1 index. */ gimple p = gimple_build_with_ops (GIMPLE_SWITCH, ERROR_MARK, 1 + (default_label != NULL) + nlabels); gimple_switch_set_index (p, index); if (default_label) gimple_switch_set_default_label (p, default_label); return p; } /* Build a GIMPLE_SWITCH statement. INDEX is the switch's index. NLABELS is the number of labels in the switch excluding the DEFAULT_LABEL. ... are the labels excluding the default. */ gimple gimple_build_switch (unsigned nlabels, tree index, tree default_label, ...) { va_list al; unsigned i, offset; gimple p = gimple_build_switch_nlabels (nlabels, index, default_label); /* Store the rest of the labels. */ va_start (al, default_label); offset = (default_label != NULL); for (i = 0; i < nlabels; i++) gimple_switch_set_label (p, i + offset, va_arg (al, tree)); va_end (al); return p; } /* Build a GIMPLE_SWITCH statement. INDEX is the switch's index. DEFAULT_LABEL is the default label ARGS is a vector of labels excluding the default. */ gimple gimple_build_switch_vec (tree index, tree default_label, VEC(tree, heap) *args) { unsigned i, offset, nlabels = VEC_length (tree, args); gimple p = gimple_build_switch_nlabels (nlabels, index, default_label); /* Copy the labels from the vector to the switch statement. */ offset = (default_label != NULL); for (i = 0; i < nlabels; i++) gimple_switch_set_label (p, i + offset, VEC_index (tree, args, i)); return p; } /* Build a GIMPLE_EH_DISPATCH statement. */ gimple gimple_build_eh_dispatch (int region) { gimple p = gimple_build_with_ops (GIMPLE_EH_DISPATCH, ERROR_MARK, 0); p->gimple_eh_ctrl.region = region; return p; } /* Build a new GIMPLE_DEBUG_BIND statement. VAR is bound to VALUE; block and location are taken from STMT. */ gimple gimple_build_debug_bind_stat (tree var, tree value, gimple stmt MEM_STAT_DECL) { gimple p = gimple_build_with_ops_stat (GIMPLE_DEBUG, (unsigned)GIMPLE_DEBUG_BIND, 2 PASS_MEM_STAT); gimple_debug_bind_set_var (p, var); gimple_debug_bind_set_value (p, value); if (stmt) { gimple_set_block (p, gimple_block (stmt)); gimple_set_location (p, gimple_location (stmt)); } return p; } /* Build a GIMPLE_OMP_CRITICAL statement. BODY is the sequence of statements for which only one thread can execute. NAME is optional identifier for this critical block. */ gimple gimple_build_omp_critical (gimple_seq body, tree name) { gimple p = gimple_alloc (GIMPLE_OMP_CRITICAL, 0); gimple_omp_critical_set_name (p, name); if (body) gimple_omp_set_body (p, body); return p; } /* Build a GIMPLE_OMP_FOR statement. BODY is sequence of statements inside the for loop. CLAUSES, are any of the OMP loop construct's clauses: private, firstprivate, lastprivate, reductions, ordered, schedule, and nowait. COLLAPSE is the collapse count. PRE_BODY is the sequence of statements that are loop invariant. */ gimple gimple_build_omp_for (gimple_seq body, tree clauses, size_t collapse, gimple_seq pre_body) { gimple p = gimple_alloc (GIMPLE_OMP_FOR, 0); if (body) gimple_omp_set_body (p, body); gimple_omp_for_set_clauses (p, clauses); p->gimple_omp_for.collapse = collapse; p->gimple_omp_for.iter = GGC_CNEWVEC (struct gimple_omp_for_iter, collapse); if (pre_body) gimple_omp_for_set_pre_body (p, pre_body); return p; } /* Build a GIMPLE_OMP_PARALLEL statement. BODY is sequence of statements which are executed in parallel. CLAUSES, are the OMP parallel construct's clauses. CHILD_FN is the function created for the parallel threads to execute. DATA_ARG are the shared data argument(s). */ gimple gimple_build_omp_parallel (gimple_seq body, tree clauses, tree child_fn, tree data_arg) { gimple p = gimple_alloc (GIMPLE_OMP_PARALLEL, 0); if (body) gimple_omp_set_body (p, body); gimple_omp_parallel_set_clauses (p, clauses); gimple_omp_parallel_set_child_fn (p, child_fn); gimple_omp_parallel_set_data_arg (p, data_arg); return p; } /* Build a GIMPLE_OMP_TASK statement. BODY is sequence of statements which are executed by the explicit task. CLAUSES, are the OMP parallel construct's clauses. CHILD_FN is the function created for the parallel threads to execute. DATA_ARG are the shared data argument(s). COPY_FN is the optional function for firstprivate initialization. ARG_SIZE and ARG_ALIGN are size and alignment of the data block. */ gimple gimple_build_omp_task (gimple_seq body, tree clauses, tree child_fn, tree data_arg, tree copy_fn, tree arg_size, tree arg_align) { gimple p = gimple_alloc (GIMPLE_OMP_TASK, 0); if (body) gimple_omp_set_body (p, body); gimple_omp_task_set_clauses (p, clauses); gimple_omp_task_set_child_fn (p, child_fn); gimple_omp_task_set_data_arg (p, data_arg); gimple_omp_task_set_copy_fn (p, copy_fn); gimple_omp_task_set_arg_size (p, arg_size); gimple_omp_task_set_arg_align (p, arg_align); return p; } /* Build a GIMPLE_OMP_SECTION statement for a sections statement. BODY is the sequence of statements in the section. */ gimple gimple_build_omp_section (gimple_seq body) { gimple p = gimple_alloc (GIMPLE_OMP_SECTION, 0); if (body) gimple_omp_set_body (p, body); return p; } /* Build a GIMPLE_OMP_MASTER statement. BODY is the sequence of statements to be executed by just the master. */ gimple gimple_build_omp_master (gimple_seq body) { gimple p = gimple_alloc (GIMPLE_OMP_MASTER, 0); if (body) gimple_omp_set_body (p, body); return p; } /* Build a GIMPLE_OMP_CONTINUE statement. CONTROL_DEF is the definition of the control variable. CONTROL_USE is the use of the control variable. */ gimple gimple_build_omp_continue (tree control_def, tree control_use) { gimple p = gimple_alloc (GIMPLE_OMP_CONTINUE, 0); gimple_omp_continue_set_control_def (p, control_def); gimple_omp_continue_set_control_use (p, control_use); return p; } /* Build a GIMPLE_OMP_ORDERED statement. BODY is the sequence of statements inside a loop that will executed in sequence. */ gimple gimple_build_omp_ordered (gimple_seq body) { gimple p = gimple_alloc (GIMPLE_OMP_ORDERED, 0); if (body) gimple_omp_set_body (p, body); return p; } /* Build a GIMPLE_OMP_RETURN statement. WAIT_P is true if this is a non-waiting return. */ gimple gimple_build_omp_return (bool wait_p) { gimple p = gimple_alloc (GIMPLE_OMP_RETURN, 0); if (wait_p) gimple_omp_return_set_nowait (p); return p; } /* Build a GIMPLE_OMP_SECTIONS statement. BODY is a sequence of section statements. CLAUSES are any of the OMP sections contsruct's clauses: private, firstprivate, lastprivate, reduction, and nowait. */ gimple gimple_build_omp_sections (gimple_seq body, tree clauses) { gimple p = gimple_alloc (GIMPLE_OMP_SECTIONS, 0); if (body) gimple_omp_set_body (p, body); gimple_omp_sections_set_clauses (p, clauses); return p; } /* Build a GIMPLE_OMP_SECTIONS_SWITCH. */ gimple gimple_build_omp_sections_switch (void) { return gimple_alloc (GIMPLE_OMP_SECTIONS_SWITCH, 0); } /* Build a GIMPLE_OMP_SINGLE statement. BODY is the sequence of statements that will be executed once. CLAUSES are any of the OMP single construct's clauses: private, firstprivate, copyprivate, nowait. */ gimple gimple_build_omp_single (gimple_seq body, tree clauses) { gimple p = gimple_alloc (GIMPLE_OMP_SINGLE, 0); if (body) gimple_omp_set_body (p, body); gimple_omp_single_set_clauses (p, clauses); return p; } /* Build a GIMPLE_OMP_ATOMIC_LOAD statement. */ gimple gimple_build_omp_atomic_load (tree lhs, tree rhs) { gimple p = gimple_alloc (GIMPLE_OMP_ATOMIC_LOAD, 0); gimple_omp_atomic_load_set_lhs (p, lhs); gimple_omp_atomic_load_set_rhs (p, rhs); return p; } /* Build a GIMPLE_OMP_ATOMIC_STORE statement. VAL is the value we are storing. */ gimple gimple_build_omp_atomic_store (tree val) { gimple p = gimple_alloc (GIMPLE_OMP_ATOMIC_STORE, 0); gimple_omp_atomic_store_set_val (p, val); return p; } /* Build a GIMPLE_PREDICT statement. PREDICT is one of the predictors from predict.def, OUTCOME is NOT_TAKEN or TAKEN. */ gimple gimple_build_predict (enum br_predictor predictor, enum prediction outcome) { gimple p = gimple_alloc (GIMPLE_PREDICT, 0); /* Ensure all the predictors fit into the lower bits of the subcode. */ gcc_assert ((int) END_PREDICTORS <= GF_PREDICT_TAKEN); gimple_predict_set_predictor (p, predictor); gimple_predict_set_outcome (p, outcome); return p; } #if defined ENABLE_GIMPLE_CHECKING /* Complain of a gimple type mismatch and die. */ void gimple_check_failed (const_gimple gs, const char *file, int line, const char *function, enum gimple_code code, enum tree_code subcode) { internal_error ("gimple check: expected %s(%s), have %s(%s) in %s, at %s:%d", gimple_code_name[code], tree_code_name[subcode], gimple_code_name[gimple_code (gs)], gs->gsbase.subcode > 0 ? tree_code_name[gs->gsbase.subcode] : "", function, trim_filename (file), line); } #endif /* ENABLE_GIMPLE_CHECKING */ /* Allocate a new GIMPLE sequence in GC memory and return it. If there are free sequences in GIMPLE_SEQ_CACHE return one of those instead. */ gimple_seq gimple_seq_alloc (void) { gimple_seq seq = gimple_seq_cache; if (seq) { gimple_seq_cache = gimple_seq_cache->next_free; gcc_assert (gimple_seq_cache != seq); memset (seq, 0, sizeof (*seq)); } else { seq = (gimple_seq) ggc_alloc_cleared (sizeof (*seq)); #ifdef GATHER_STATISTICS gimple_alloc_counts[(int) gimple_alloc_kind_seq]++; gimple_alloc_sizes[(int) gimple_alloc_kind_seq] += sizeof (*seq); #endif } return seq; } /* Return SEQ to the free pool of GIMPLE sequences. */ void gimple_seq_free (gimple_seq seq) { if (seq == NULL) return; gcc_assert (gimple_seq_first (seq) == NULL); gcc_assert (gimple_seq_last (seq) == NULL); /* If this triggers, it's a sign that the same list is being freed twice. */ gcc_assert (seq != gimple_seq_cache || gimple_seq_cache == NULL); /* Add SEQ to the pool of free sequences. */ seq->next_free = gimple_seq_cache; gimple_seq_cache = seq; } /* Link gimple statement GS to the end of the sequence *SEQ_P. If *SEQ_P is NULL, a new sequence is allocated. */ void gimple_seq_add_stmt (gimple_seq *seq_p, gimple gs) { gimple_stmt_iterator si; if (gs == NULL) return; if (*seq_p == NULL) *seq_p = gimple_seq_alloc (); si = gsi_last (*seq_p); gsi_insert_after (&si, gs, GSI_NEW_STMT); } /* Append sequence SRC to the end of sequence *DST_P. If *DST_P is NULL, a new sequence is allocated. */ void gimple_seq_add_seq (gimple_seq *dst_p, gimple_seq src) { gimple_stmt_iterator si; if (src == NULL) return; if (*dst_p == NULL) *dst_p = gimple_seq_alloc (); si = gsi_last (*dst_p); gsi_insert_seq_after (&si, src, GSI_NEW_STMT); } /* Helper function of empty_body_p. Return true if STMT is an empty statement. */ static bool empty_stmt_p (gimple stmt) { if (gimple_code (stmt) == GIMPLE_NOP) return true; if (gimple_code (stmt) == GIMPLE_BIND) return empty_body_p (gimple_bind_body (stmt)); return false; } /* Return true if BODY contains nothing but empty statements. */ bool empty_body_p (gimple_seq body) { gimple_stmt_iterator i; if (gimple_seq_empty_p (body)) return true; for (i = gsi_start (body); !gsi_end_p (i); gsi_next (&i)) if (!empty_stmt_p (gsi_stmt (i)) && !is_gimple_debug (gsi_stmt (i))) return false; return true; } /* Perform a deep copy of sequence SRC and return the result. */ gimple_seq gimple_seq_copy (gimple_seq src) { gimple_stmt_iterator gsi; gimple_seq new_seq = gimple_seq_alloc (); gimple stmt; for (gsi = gsi_start (src); !gsi_end_p (gsi); gsi_next (&gsi)) { stmt = gimple_copy (gsi_stmt (gsi)); gimple_seq_add_stmt (&new_seq, stmt); } return new_seq; } /* Walk all the statements in the sequence SEQ calling walk_gimple_stmt on each one. WI is as in walk_gimple_stmt. If walk_gimple_stmt returns non-NULL, the walk is stopped, the value is stored in WI->CALLBACK_RESULT and the statement that produced the value is returned. Otherwise, all the statements are walked and NULL returned. */ gimple walk_gimple_seq (gimple_seq seq, walk_stmt_fn callback_stmt, walk_tree_fn callback_op, struct walk_stmt_info *wi) { gimple_stmt_iterator gsi; for (gsi = gsi_start (seq); !gsi_end_p (gsi); gsi_next (&gsi)) { tree ret = walk_gimple_stmt (&gsi, callback_stmt, callback_op, wi); if (ret) { /* If CALLBACK_STMT or CALLBACK_OP return a value, WI must exist to hold it. */ gcc_assert (wi); wi->callback_result = ret; return gsi_stmt (gsi); } } if (wi) wi->callback_result = NULL_TREE; return NULL; } /* Helper function for walk_gimple_stmt. Walk operands of a GIMPLE_ASM. */ static tree walk_gimple_asm (gimple stmt, walk_tree_fn callback_op, struct walk_stmt_info *wi) { tree ret, op; unsigned noutputs; const char **oconstraints; unsigned i, n; const char *constraint; bool allows_mem, allows_reg, is_inout; noutputs = gimple_asm_noutputs (stmt); oconstraints = (const char **) alloca ((noutputs) * sizeof (const char *)); if (wi) wi->is_lhs = true; for (i = 0; i < noutputs; i++) { op = gimple_asm_output_op (stmt, i); constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (op))); oconstraints[i] = constraint; parse_output_constraint (&constraint, i, 0, 0, &allows_mem, &allows_reg, &is_inout); if (wi) wi->val_only = (allows_reg || !allows_mem); ret = walk_tree (&TREE_VALUE (op), callback_op, wi, NULL); if (ret) return ret; } n = gimple_asm_ninputs (stmt); for (i = 0; i < n; i++) { op = gimple_asm_input_op (stmt, i); constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (op))); parse_input_constraint (&constraint, 0, 0, noutputs, 0, oconstraints, &allows_mem, &allows_reg); if (wi) { wi->val_only = (allows_reg || !allows_mem); /* Although input "m" is not really a LHS, we need a lvalue. */ wi->is_lhs = !wi->val_only; } ret = walk_tree (&TREE_VALUE (op), callback_op, wi, NULL); if (ret) return ret; } if (wi) { wi->is_lhs = false; wi->val_only = true; } n = gimple_asm_nlabels (stmt); for (i = 0; i < n; i++) { op = gimple_asm_label_op (stmt, i); ret = walk_tree (&TREE_VALUE (op), callback_op, wi, NULL); if (ret) return ret; } return NULL_TREE; } /* Helper function of WALK_GIMPLE_STMT. Walk every tree operand in STMT. CALLBACK_OP and WI are as in WALK_GIMPLE_STMT. CALLBACK_OP is called on each operand of STMT via walk_tree. Additional parameters to walk_tree must be stored in WI. For each operand OP, walk_tree is called as: walk_tree (&OP, CALLBACK_OP, WI, WI->PSET) If CALLBACK_OP returns non-NULL for an operand, the remaining operands are not scanned. The return value is that returned by the last call to walk_tree, or NULL_TREE if no CALLBACK_OP is specified. */ tree walk_gimple_op (gimple stmt, walk_tree_fn callback_op, struct walk_stmt_info *wi) { struct pointer_set_t *pset = (wi) ? wi->pset : NULL; unsigned i; tree ret = NULL_TREE; switch (gimple_code (stmt)) { case GIMPLE_ASSIGN: /* Walk the RHS operands. A formal temporary LHS may use a COMPONENT_REF RHS. */ if (wi) wi->val_only = !is_gimple_reg (gimple_assign_lhs (stmt)) || !gimple_assign_single_p (stmt); for (i = 1; i < gimple_num_ops (stmt); i++) { ret = walk_tree (gimple_op_ptr (stmt, i), callback_op, wi, pset); if (ret) return ret; } /* Walk the LHS. If the RHS is appropriate for a memory, we may use a COMPONENT_REF on the LHS. */ if (wi) { /* If the RHS has more than 1 operand, it is not appropriate for the memory. */ wi->val_only = !is_gimple_mem_rhs (gimple_assign_rhs1 (stmt)) || !gimple_assign_single_p (stmt); wi->is_lhs = true; } ret = walk_tree (gimple_op_ptr (stmt, 0), callback_op, wi, pset); if (ret) return ret; if (wi) { wi->val_only = true; wi->is_lhs = false; } break; case GIMPLE_CALL: if (wi) wi->is_lhs = false; ret = walk_tree (gimple_call_chain_ptr (stmt), callback_op, wi, pset); if (ret) return ret; ret = walk_tree (gimple_call_fn_ptr (stmt), callback_op, wi, pset); if (ret) return ret; for (i = 0; i < gimple_call_num_args (stmt); i++) { ret = walk_tree (gimple_call_arg_ptr (stmt, i), callback_op, wi, pset); if (ret) return ret; } if (wi) wi->is_lhs = true; ret = walk_tree (gimple_call_lhs_ptr (stmt), callback_op, wi, pset); if (ret) return ret; if (wi) wi->is_lhs = false; break; case GIMPLE_CATCH: ret = walk_tree (gimple_catch_types_ptr (stmt), callback_op, wi, pset); if (ret) return ret; break; case GIMPLE_EH_FILTER: ret = walk_tree (gimple_eh_filter_types_ptr (stmt), callback_op, wi, pset); if (ret) return ret; break; case GIMPLE_ASM: ret = walk_gimple_asm (stmt, callback_op, wi); if (ret) return ret; break; case GIMPLE_OMP_CONTINUE: ret = walk_tree (gimple_omp_continue_control_def_ptr (stmt), callback_op, wi, pset); if (ret) return ret; ret = walk_tree (gimple_omp_continue_control_use_ptr (stmt), callback_op, wi, pset); if (ret) return ret; break; case GIMPLE_OMP_CRITICAL: ret = walk_tree (gimple_omp_critical_name_ptr (stmt), callback_op, wi, pset); if (ret) return ret; break; case GIMPLE_OMP_FOR: ret = walk_tree (gimple_omp_for_clauses_ptr (stmt), callback_op, wi, pset); if (ret) return ret; for (i = 0; i < gimple_omp_for_collapse (stmt); i++) { ret = walk_tree (gimple_omp_for_index_ptr (stmt, i), callback_op, wi, pset); if (ret) return ret; ret = walk_tree (gimple_omp_for_initial_ptr (stmt, i), callback_op, wi, pset); if (ret) return ret; ret = walk_tree (gimple_omp_for_final_ptr (stmt, i), callback_op, wi, pset); if (ret) return ret; ret = walk_tree (gimple_omp_for_incr_ptr (stmt, i), callback_op, wi, pset); } if (ret) return ret; break; case GIMPLE_OMP_PARALLEL: ret = walk_tree (gimple_omp_parallel_clauses_ptr (stmt), callback_op, wi, pset); if (ret) return ret; ret = walk_tree (gimple_omp_parallel_child_fn_ptr (stmt), callback_op, wi, pset); if (ret) return ret; ret = walk_tree (gimple_omp_parallel_data_arg_ptr (stmt), callback_op, wi, pset); if (ret) return ret; break; case GIMPLE_OMP_TASK: ret = walk_tree (gimple_omp_task_clauses_ptr (stmt), callback_op, wi, pset); if (ret) return ret; ret = walk_tree (gimple_omp_task_child_fn_ptr (stmt), callback_op, wi, pset); if (ret) return ret; ret = walk_tree (gimple_omp_task_data_arg_ptr (stmt), callback_op, wi, pset); if (ret) return ret; ret = walk_tree (gimple_omp_task_copy_fn_ptr (stmt), callback_op, wi, pset); if (ret) return ret; ret = walk_tree (gimple_omp_task_arg_size_ptr (stmt), callback_op, wi, pset); if (ret) return ret; ret = walk_tree (gimple_omp_task_arg_align_ptr (stmt), callback_op, wi, pset); if (ret) return ret; break; case GIMPLE_OMP_SECTIONS: ret = walk_tree (gimple_omp_sections_clauses_ptr (stmt), callback_op, wi, pset); if (ret) return ret; ret = walk_tree (gimple_omp_sections_control_ptr (stmt), callback_op, wi, pset); if (ret) return ret; break; case GIMPLE_OMP_SINGLE: ret = walk_tree (gimple_omp_single_clauses_ptr (stmt), callback_op, wi, pset); if (ret) return ret; break; case GIMPLE_OMP_ATOMIC_LOAD: ret = walk_tree (gimple_omp_atomic_load_lhs_ptr (stmt), callback_op, wi, pset); if (ret) return ret; ret = walk_tree (gimple_omp_atomic_load_rhs_ptr (stmt), callback_op, wi, pset); if (ret) return ret; break; case GIMPLE_OMP_ATOMIC_STORE: ret = walk_tree (gimple_omp_atomic_store_val_ptr (stmt), callback_op, wi, pset); if (ret) return ret; break; /* Tuples that do not have operands. */ case GIMPLE_NOP: case GIMPLE_RESX: case GIMPLE_OMP_RETURN: case GIMPLE_PREDICT: break; default: { enum gimple_statement_structure_enum gss; gss = gimple_statement_structure (stmt); if (gss == GSS_WITH_OPS || gss == GSS_WITH_MEM_OPS) for (i = 0; i < gimple_num_ops (stmt); i++) { ret = walk_tree (gimple_op_ptr (stmt, i), callback_op, wi, pset); if (ret) return ret; } } break; } return NULL_TREE; } /* Walk the current statement in GSI (optionally using traversal state stored in WI). If WI is NULL, no state is kept during traversal. The callback CALLBACK_STMT is called. If CALLBACK_STMT indicates that it has handled all the operands of the statement, its return value is returned. Otherwise, the return value from CALLBACK_STMT is discarded and its operands are scanned. If CALLBACK_STMT is NULL or it didn't handle the operands, CALLBACK_OP is called on each operand of the statement via walk_gimple_op. If walk_gimple_op returns non-NULL for any operand, the remaining operands are not scanned. In this case, the return value from CALLBACK_OP is returned. In any other case, NULL_TREE is returned. */ tree walk_gimple_stmt (gimple_stmt_iterator *gsi, walk_stmt_fn callback_stmt, walk_tree_fn callback_op, struct walk_stmt_info *wi) { gimple ret; tree tree_ret; gimple stmt = gsi_stmt (*gsi); if (wi) wi->gsi = *gsi; if (wi && wi->want_locations && gimple_has_location (stmt)) input_location = gimple_location (stmt); ret = NULL; /* Invoke the statement callback. Return if the callback handled all of STMT operands by itself. */ if (callback_stmt) { bool handled_ops = false; tree_ret = callback_stmt (gsi, &handled_ops, wi); if (handled_ops) return tree_ret; /* If CALLBACK_STMT did not handle operands, it should not have a value to return. */ gcc_assert (tree_ret == NULL); /* Re-read stmt in case the callback changed it. */ stmt = gsi_stmt (*gsi); } /* If CALLBACK_OP is defined, invoke it on every operand of STMT. */ if (callback_op) { tree_ret = walk_gimple_op (stmt, callback_op, wi); if (tree_ret) return tree_ret; } /* If STMT can have statements inside (e.g. GIMPLE_BIND), walk them. */ switch (gimple_code (stmt)) { case GIMPLE_BIND: ret = walk_gimple_seq (gimple_bind_body (stmt), callback_stmt, callback_op, wi); if (ret) return wi->callback_result; break; case GIMPLE_CATCH: ret = walk_gimple_seq (gimple_catch_handler (stmt), callback_stmt, callback_op, wi); if (ret) return wi->callback_result; break; case GIMPLE_EH_FILTER: ret = walk_gimple_seq (gimple_eh_filter_failure (stmt), callback_stmt, callback_op, wi); if (ret) return wi->callback_result; break; case GIMPLE_TRY: ret = walk_gimple_seq (gimple_try_eval (stmt), callback_stmt, callback_op, wi); if (ret) return wi->callback_result; ret = walk_gimple_seq (gimple_try_cleanup (stmt), callback_stmt, callback_op, wi); if (ret) return wi->callback_result; break; case GIMPLE_OMP_FOR: ret = walk_gimple_seq (gimple_omp_for_pre_body (stmt), callback_stmt, callback_op, wi); if (ret) return wi->callback_result; /* FALL THROUGH. */ case GIMPLE_OMP_CRITICAL: case GIMPLE_OMP_MASTER: case GIMPLE_OMP_ORDERED: case GIMPLE_OMP_SECTION: case GIMPLE_OMP_PARALLEL: case GIMPLE_OMP_TASK: case GIMPLE_OMP_SECTIONS: case GIMPLE_OMP_SINGLE: ret = walk_gimple_seq (gimple_omp_body (stmt), callback_stmt, callback_op, wi); if (ret) return wi->callback_result; break; case GIMPLE_WITH_CLEANUP_EXPR: ret = walk_gimple_seq (gimple_wce_cleanup (stmt), callback_stmt, callback_op, wi); if (ret) return wi->callback_result; break; default: gcc_assert (!gimple_has_substatements (stmt)); break; } return NULL; } /* Set sequence SEQ to be the GIMPLE body for function FN. */ void gimple_set_body (tree fndecl, gimple_seq seq) { struct function *fn = DECL_STRUCT_FUNCTION (fndecl); if (fn == NULL) { /* If FNDECL still does not have a function structure associated with it, then it does not make sense for it to receive a GIMPLE body. */ gcc_assert (seq == NULL); } else fn->gimple_body = seq; } /* Return the body of GIMPLE statements for function FN. */ gimple_seq gimple_body (tree fndecl) { struct function *fn = DECL_STRUCT_FUNCTION (fndecl); return fn ? fn->gimple_body : NULL; } /* Return true when FNDECL has Gimple body either in unlowered or CFG form. */ bool gimple_has_body_p (tree fndecl) { struct function *fn = DECL_STRUCT_FUNCTION (fndecl); return (gimple_body (fndecl) || (fn && fn->cfg)); } /* Detect flags from a GIMPLE_CALL. This is just like call_expr_flags, but for gimple tuples. */ int gimple_call_flags (const_gimple stmt) { int flags; tree decl = gimple_call_fndecl (stmt); tree t; if (decl) flags = flags_from_decl_or_type (decl); else { t = TREE_TYPE (gimple_call_fn (stmt)); if (t && TREE_CODE (t) == POINTER_TYPE) flags = flags_from_decl_or_type (TREE_TYPE (t)); else flags = 0; } if (stmt->gsbase.subcode & GF_CALL_NOTHROW) flags |= ECF_NOTHROW; return flags; } /* Return true if GS is a copy assignment. */ bool gimple_assign_copy_p (gimple gs) { return gimple_code (gs) == GIMPLE_ASSIGN && get_gimple_rhs_class (gimple_assign_rhs_code (gs)) == GIMPLE_SINGLE_RHS && is_gimple_val (gimple_op (gs, 1)); } /* Return true if GS is a SSA_NAME copy assignment. */ bool gimple_assign_ssa_name_copy_p (gimple gs) { return (gimple_code (gs) == GIMPLE_ASSIGN && (get_gimple_rhs_class (gimple_assign_rhs_code (gs)) == GIMPLE_SINGLE_RHS) && TREE_CODE (gimple_assign_lhs (gs)) == SSA_NAME && TREE_CODE (gimple_assign_rhs1 (gs)) == SSA_NAME); } /* Return true if GS is an assignment with a singleton RHS, i.e., there is no operator associated with the assignment itself. Unlike gimple_assign_copy_p, this predicate returns true for any RHS operand, including those that perform an operation and do not have the semantics of a copy, such as COND_EXPR. */ bool gimple_assign_single_p (gimple gs) { return (gimple_code (gs) == GIMPLE_ASSIGN && get_gimple_rhs_class (gimple_assign_rhs_code (gs)) == GIMPLE_SINGLE_RHS); } /* Return true if GS is an assignment with a unary RHS, but the operator has no effect on the assigned value. The logic is adapted from STRIP_NOPS. This predicate is intended to be used in tuplifying instances in which STRIP_NOPS was previously applied to the RHS of an assignment. NOTE: In the use cases that led to the creation of this function and of gimple_assign_single_p, it is typical to test for either condition and to proceed in the same manner. In each case, the assigned value is represented by the single RHS operand of the assignment. I suspect there may be cases where gimple_assign_copy_p, gimple_assign_single_p, or equivalent logic is used where a similar treatment of unary NOPs is appropriate. */ bool gimple_assign_unary_nop_p (gimple gs) { return (gimple_code (gs) == GIMPLE_ASSIGN && (CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (gs)) || gimple_assign_rhs_code (gs) == NON_LVALUE_EXPR) && gimple_assign_rhs1 (gs) != error_mark_node && (TYPE_MODE (TREE_TYPE (gimple_assign_lhs (gs))) == TYPE_MODE (TREE_TYPE (gimple_assign_rhs1 (gs))))); } /* Set BB to be the basic block holding G. */ void gimple_set_bb (gimple stmt, basic_block bb) { stmt->gsbase.bb = bb; /* If the statement is a label, add the label to block-to-labels map so that we can speed up edge creation for GIMPLE_GOTOs. */ if (cfun->cfg && gimple_code (stmt) == GIMPLE_LABEL) { tree t; int uid; t = gimple_label_label (stmt); uid = LABEL_DECL_UID (t); if (uid == -1) { unsigned old_len = VEC_length (basic_block, label_to_block_map); LABEL_DECL_UID (t) = uid = cfun->cfg->last_label_uid++; if (old_len <= (unsigned) uid) { unsigned new_len = 3 * uid / 2 + 1; VEC_safe_grow_cleared (basic_block, gc, label_to_block_map, new_len); } } VEC_replace (basic_block, label_to_block_map, uid, bb); } } /* Modify the RHS of the assignment pointed-to by GSI using the operands in the expression tree EXPR. NOTE: The statement pointed-to by GSI may be reallocated if it did not have enough operand slots. This function is useful to convert an existing tree expression into the flat representation used for the RHS of a GIMPLE assignment. It will reallocate memory as needed to expand or shrink the number of operand slots needed to represent EXPR. NOTE: If you find yourself building a tree and then calling this function, you are most certainly doing it the slow way. It is much better to build a new assignment or to use the function gimple_assign_set_rhs_with_ops, which does not require an expression tree to be built. */ void gimple_assign_set_rhs_from_tree (gimple_stmt_iterator *gsi, tree expr) { enum tree_code subcode; tree op1, op2; extract_ops_from_tree (expr, &subcode, &op1, &op2); gimple_assign_set_rhs_with_ops (gsi, subcode, op1, op2); } /* Set the RHS of assignment statement pointed-to by GSI to CODE with operands OP1 and OP2. NOTE: The statement pointed-to by GSI may be reallocated if it did not have enough operand slots. */ void gimple_assign_set_rhs_with_ops (gimple_stmt_iterator *gsi, enum tree_code code, tree op1, tree op2) { unsigned new_rhs_ops = get_gimple_rhs_num_ops (code); gimple stmt = gsi_stmt (*gsi); /* If the new CODE needs more operands, allocate a new statement. */ if (gimple_num_ops (stmt) < new_rhs_ops + 1) { tree lhs = gimple_assign_lhs (stmt); gimple new_stmt = gimple_alloc (gimple_code (stmt), new_rhs_ops + 1); memcpy (new_stmt, stmt, gimple_size (gimple_code (stmt))); gsi_replace (gsi, new_stmt, true); stmt = new_stmt; /* The LHS needs to be reset as this also changes the SSA name on the LHS. */ gimple_assign_set_lhs (stmt, lhs); } gimple_set_num_ops (stmt, new_rhs_ops + 1); gimple_set_subcode (stmt, code); gimple_assign_set_rhs1 (stmt, op1); if (new_rhs_ops > 1) gimple_assign_set_rhs2 (stmt, op2); } /* Return the LHS of a statement that performs an assignment, either a GIMPLE_ASSIGN or a GIMPLE_CALL. Returns NULL_TREE for a call to a function that returns no value, or for a statement other than an assignment or a call. */ tree gimple_get_lhs (const_gimple stmt) { enum gimple_code code = gimple_code (stmt); if (code == GIMPLE_ASSIGN) return gimple_assign_lhs (stmt); else if (code == GIMPLE_CALL) return gimple_call_lhs (stmt); else return NULL_TREE; } /* Set the LHS of a statement that performs an assignment, either a GIMPLE_ASSIGN or a GIMPLE_CALL. */ void gimple_set_lhs (gimple stmt, tree lhs) { enum gimple_code code = gimple_code (stmt); if (code == GIMPLE_ASSIGN) gimple_assign_set_lhs (stmt, lhs); else if (code == GIMPLE_CALL) gimple_call_set_lhs (stmt, lhs); else gcc_unreachable(); } /* Replace the LHS of STMT, an assignment, either a GIMPLE_ASSIGN or a GIMPLE_CALL, with NLHS, in preparation for modifying the RHS to an expression with a different value. This will update any annotations (say debug bind stmts) referring to the original LHS, so that they use the RHS instead. This is done even if NLHS and LHS are the same, for it is understood that the RHS will be modified afterwards, and NLHS will not be assigned an equivalent value. Adjusting any non-annotation uses of the LHS, if needed, is a responsibility of the caller. The effect of this call should be pretty much the same as that of inserting a copy of STMT before STMT, and then removing the original stmt, at which time gsi_remove() would have update annotations, but using this function saves all the inserting, copying and removing. */ void gimple_replace_lhs (gimple stmt, tree nlhs) { if (MAY_HAVE_DEBUG_STMTS) { tree lhs = gimple_get_lhs (stmt); gcc_assert (SSA_NAME_DEF_STMT (lhs) == stmt); insert_debug_temp_for_var_def (NULL, lhs); } gimple_set_lhs (stmt, nlhs); } /* Return a deep copy of statement STMT. All the operands from STMT are reallocated and copied using unshare_expr. The DEF, USE, VDEF and VUSE operand arrays are set to empty in the new copy. */ gimple gimple_copy (gimple stmt) { enum gimple_code code = gimple_code (stmt); unsigned num_ops = gimple_num_ops (stmt); gimple copy = gimple_alloc (code, num_ops); unsigned i; /* Shallow copy all the fields from STMT. */ memcpy (copy, stmt, gimple_size (code)); /* If STMT has sub-statements, deep-copy them as well. */ if (gimple_has_substatements (stmt)) { gimple_seq new_seq; tree t; switch (gimple_code (stmt)) { case GIMPLE_BIND: new_seq = gimple_seq_copy (gimple_bind_body (stmt)); gimple_bind_set_body (copy, new_seq); gimple_bind_set_vars (copy, unshare_expr (gimple_bind_vars (stmt))); gimple_bind_set_block (copy, gimple_bind_block (stmt)); break; case GIMPLE_CATCH: new_seq = gimple_seq_copy (gimple_catch_handler (stmt)); gimple_catch_set_handler (copy, new_seq); t = unshare_expr (gimple_catch_types (stmt)); gimple_catch_set_types (copy, t); break; case GIMPLE_EH_FILTER: new_seq = gimple_seq_copy (gimple_eh_filter_failure (stmt)); gimple_eh_filter_set_failure (copy, new_seq); t = unshare_expr (gimple_eh_filter_types (stmt)); gimple_eh_filter_set_types (copy, t); break; case GIMPLE_TRY: new_seq = gimple_seq_copy (gimple_try_eval (stmt)); gimple_try_set_eval (copy, new_seq); new_seq = gimple_seq_copy (gimple_try_cleanup (stmt)); gimple_try_set_cleanup (copy, new_seq); break; case GIMPLE_OMP_FOR: new_seq = gimple_seq_copy (gimple_omp_for_pre_body (stmt)); gimple_omp_for_set_pre_body (copy, new_seq); t = unshare_expr (gimple_omp_for_clauses (stmt)); gimple_omp_for_set_clauses (copy, t); copy->gimple_omp_for.iter = GGC_NEWVEC (struct gimple_omp_for_iter, gimple_omp_for_collapse (stmt)); for (i = 0; i < gimple_omp_for_collapse (stmt); i++) { gimple_omp_for_set_cond (copy, i, gimple_omp_for_cond (stmt, i)); gimple_omp_for_set_index (copy, i, gimple_omp_for_index (stmt, i)); t = unshare_expr (gimple_omp_for_initial (stmt, i)); gimple_omp_for_set_initial (copy, i, t); t = unshare_expr (gimple_omp_for_final (stmt, i)); gimple_omp_for_set_final (copy, i, t); t = unshare_expr (gimple_omp_for_incr (stmt, i)); gimple_omp_for_set_incr (copy, i, t); } goto copy_omp_body; case GIMPLE_OMP_PARALLEL: t = unshare_expr (gimple_omp_parallel_clauses (stmt)); gimple_omp_parallel_set_clauses (copy, t); t = unshare_expr (gimple_omp_parallel_child_fn (stmt)); gimple_omp_parallel_set_child_fn (copy, t); t = unshare_expr (gimple_omp_parallel_data_arg (stmt)); gimple_omp_parallel_set_data_arg (copy, t); goto copy_omp_body; case GIMPLE_OMP_TASK: t = unshare_expr (gimple_omp_task_clauses (stmt)); gimple_omp_task_set_clauses (copy, t); t = unshare_expr (gimple_omp_task_child_fn (stmt)); gimple_omp_task_set_child_fn (copy, t); t = unshare_expr (gimple_omp_task_data_arg (stmt)); gimple_omp_task_set_data_arg (copy, t); t = unshare_expr (gimple_omp_task_copy_fn (stmt)); gimple_omp_task_set_copy_fn (copy, t); t = unshare_expr (gimple_omp_task_arg_size (stmt)); gimple_omp_task_set_arg_size (copy, t); t = unshare_expr (gimple_omp_task_arg_align (stmt)); gimple_omp_task_set_arg_align (copy, t); goto copy_omp_body; case GIMPLE_OMP_CRITICAL: t = unshare_expr (gimple_omp_critical_name (stmt)); gimple_omp_critical_set_name (copy, t); goto copy_omp_body; case GIMPLE_OMP_SECTIONS: t = unshare_expr (gimple_omp_sections_clauses (stmt)); gimple_omp_sections_set_clauses (copy, t); t = unshare_expr (gimple_omp_sections_control (stmt)); gimple_omp_sections_set_control (copy, t); /* FALLTHRU */ case GIMPLE_OMP_SINGLE: case GIMPLE_OMP_SECTION: case GIMPLE_OMP_MASTER: case GIMPLE_OMP_ORDERED: copy_omp_body: new_seq = gimple_seq_copy (gimple_omp_body (stmt)); gimple_omp_set_body (copy, new_seq); break; case GIMPLE_WITH_CLEANUP_EXPR: new_seq = gimple_seq_copy (gimple_wce_cleanup (stmt)); gimple_wce_set_cleanup (copy, new_seq); break; default: gcc_unreachable (); } } /* Make copy of operands. */ if (num_ops > 0) { for (i = 0; i < num_ops; i++) gimple_set_op (copy, i, unshare_expr (gimple_op (stmt, i))); /* Clear out SSA operand vectors on COPY. */ if (gimple_has_ops (stmt)) { gimple_set_def_ops (copy, NULL); gimple_set_use_ops (copy, NULL); } if (gimple_has_mem_ops (stmt)) { gimple_set_vdef (copy, gimple_vdef (stmt)); gimple_set_vuse (copy, gimple_vuse (stmt)); } /* SSA operands need to be updated. */ gimple_set_modified (copy, true); } return copy; } /* Set the MODIFIED flag to MODIFIEDP, iff the gimple statement G has a MODIFIED field. */ void gimple_set_modified (gimple s, bool modifiedp) { if (gimple_has_ops (s)) { s->gsbase.modified = (unsigned) modifiedp; if (modifiedp && cfun->gimple_df && is_gimple_call (s) && gimple_call_noreturn_p (s)) VEC_safe_push (gimple, gc, MODIFIED_NORETURN_CALLS (cfun), s); } } /* Return true if statement S has side-effects. We consider a statement to have side effects if: - It is a GIMPLE_CALL not marked with ECF_PURE or ECF_CONST. - Any of its operands are marked TREE_THIS_VOLATILE or TREE_SIDE_EFFECTS. */ bool gimple_has_side_effects (const_gimple s) { unsigned i; if (is_gimple_debug (s)) return false; /* We don't have to scan the arguments to check for volatile arguments, though, at present, we still do a scan to check for TREE_SIDE_EFFECTS. */ if (gimple_has_volatile_ops (s)) return true; if (is_gimple_call (s)) { unsigned nargs = gimple_call_num_args (s); if (!(gimple_call_flags (s) & (ECF_CONST | ECF_PURE))) return true; else if (gimple_call_flags (s) & ECF_LOOPING_CONST_OR_PURE) /* An infinite loop is considered a side effect. */ return true; if (gimple_call_lhs (s) && TREE_SIDE_EFFECTS (gimple_call_lhs (s))) { gcc_assert (gimple_has_volatile_ops (s)); return true; } if (TREE_SIDE_EFFECTS (gimple_call_fn (s))) return true; for (i = 0; i < nargs; i++) if (TREE_SIDE_EFFECTS (gimple_call_arg (s, i))) { gcc_assert (gimple_has_volatile_ops (s)); return true; } return false; } else { for (i = 0; i < gimple_num_ops (s); i++) if (TREE_SIDE_EFFECTS (gimple_op (s, i))) { gcc_assert (gimple_has_volatile_ops (s)); return true; } } return false; } /* Return true if the RHS of statement S has side effects. We may use it to determine if it is admissable to replace an assignment or call with a copy of a previously-computed value. In such cases, side-effects due the the LHS are preserved. */ bool gimple_rhs_has_side_effects (const_gimple s) { unsigned i; if (is_gimple_call (s)) { unsigned nargs = gimple_call_num_args (s); if (!(gimple_call_flags (s) & (ECF_CONST | ECF_PURE))) return true; /* We cannot use gimple_has_volatile_ops here, because we must ignore a volatile LHS. */ if (TREE_SIDE_EFFECTS (gimple_call_fn (s)) || TREE_THIS_VOLATILE (gimple_call_fn (s))) { gcc_assert (gimple_has_volatile_ops (s)); return true; } for (i = 0; i < nargs; i++) if (TREE_SIDE_EFFECTS (gimple_call_arg (s, i)) || TREE_THIS_VOLATILE (gimple_call_arg (s, i))) return true; return false; } else if (is_gimple_assign (s)) { /* Skip the first operand, the LHS. */ for (i = 1; i < gimple_num_ops (s); i++) if (TREE_SIDE_EFFECTS (gimple_op (s, i)) || TREE_THIS_VOLATILE (gimple_op (s, i))) { gcc_assert (gimple_has_volatile_ops (s)); return true; } } else if (is_gimple_debug (s)) return false; else { /* For statements without an LHS, examine all arguments. */ for (i = 0; i < gimple_num_ops (s); i++) if (TREE_SIDE_EFFECTS (gimple_op (s, i)) || TREE_THIS_VOLATILE (gimple_op (s, i))) { gcc_assert (gimple_has_volatile_ops (s)); return true; } } return false; } /* Helper for gimple_could_trap_p and gimple_assign_rhs_could_trap_p. Return true if S can trap. If INCLUDE_LHS is true and S is a GIMPLE_ASSIGN, the LHS of the assignment is also checked. Otherwise, only the RHS of the assignment is checked. */ static bool gimple_could_trap_p_1 (gimple s, bool include_lhs) { unsigned i, start; tree t, div = NULL_TREE; enum tree_code op; start = (is_gimple_assign (s) && !include_lhs) ? 1 : 0; for (i = start; i < gimple_num_ops (s); i++) if (tree_could_trap_p (gimple_op (s, i))) return true; switch (gimple_code (s)) { case GIMPLE_ASM: return gimple_asm_volatile_p (s); case GIMPLE_CALL: t = gimple_call_fndecl (s); /* Assume that calls to weak functions may trap. */ if (!t || !DECL_P (t) || DECL_WEAK (t)) return true; return false; case GIMPLE_ASSIGN: t = gimple_expr_type (s); op = gimple_assign_rhs_code (s); if (get_gimple_rhs_class (op) == GIMPLE_BINARY_RHS) div = gimple_assign_rhs2 (s); return (operation_could_trap_p (op, FLOAT_TYPE_P (t), (INTEGRAL_TYPE_P (t) && TYPE_OVERFLOW_TRAPS (t)), div)); default: break; } return false; } /* Return true if statement S can trap. */ bool gimple_could_trap_p (gimple s) { return gimple_could_trap_p_1 (s, true); } /* Return true if RHS of a GIMPLE_ASSIGN S can trap. */ bool gimple_assign_rhs_could_trap_p (gimple s) { gcc_assert (is_gimple_assign (s)); return gimple_could_trap_p_1 (s, false); } /* Print debugging information for gimple stmts generated. */ void dump_gimple_statistics (void) { #ifdef GATHER_STATISTICS int i, total_tuples = 0, total_bytes = 0; fprintf (stderr, "\nGIMPLE statements\n"); fprintf (stderr, "Kind Stmts Bytes\n"); fprintf (stderr, "---------------------------------------\n"); for (i = 0; i < (int) gimple_alloc_kind_all; ++i) { fprintf (stderr, "%-20s %7d %10d\n", gimple_alloc_kind_names[i], gimple_alloc_counts[i], gimple_alloc_sizes[i]); total_tuples += gimple_alloc_counts[i]; total_bytes += gimple_alloc_sizes[i]; } fprintf (stderr, "---------------------------------------\n"); fprintf (stderr, "%-20s %7d %10d\n", "Total", total_tuples, total_bytes); fprintf (stderr, "---------------------------------------\n"); #else fprintf (stderr, "No gimple statistics\n"); #endif } /* Return the number of operands needed on the RHS of a GIMPLE assignment for an expression with tree code CODE. */ unsigned get_gimple_rhs_num_ops (enum tree_code code) { enum gimple_rhs_class rhs_class = get_gimple_rhs_class (code); if (rhs_class == GIMPLE_UNARY_RHS || rhs_class == GIMPLE_SINGLE_RHS) return 1; else if (rhs_class == GIMPLE_BINARY_RHS) return 2; else gcc_unreachable (); } #define DEFTREECODE(SYM, STRING, TYPE, NARGS) \ (unsigned char) \ ((TYPE) == tcc_unary ? GIMPLE_UNARY_RHS \ : ((TYPE) == tcc_binary \ || (TYPE) == tcc_comparison) ? GIMPLE_BINARY_RHS \ : ((TYPE) == tcc_constant \ || (TYPE) == tcc_declaration \ || (TYPE) == tcc_reference) ? GIMPLE_SINGLE_RHS \ : ((SYM) == TRUTH_AND_EXPR \ || (SYM) == TRUTH_OR_EXPR \ || (SYM) == TRUTH_XOR_EXPR) ? GIMPLE_BINARY_RHS \ : (SYM) == TRUTH_NOT_EXPR ? GIMPLE_UNARY_RHS \ : ((SYM) == COND_EXPR \ || (SYM) == CONSTRUCTOR \ || (SYM) == OBJ_TYPE_REF \ || (SYM) == ASSERT_EXPR \ || (SYM) == ADDR_EXPR \ || (SYM) == WITH_SIZE_EXPR \ || (SYM) == SSA_NAME \ || (SYM) == POLYNOMIAL_CHREC \ || (SYM) == DOT_PROD_EXPR \ || (SYM) == VEC_COND_EXPR \ || (SYM) == REALIGN_LOAD_EXPR) ? GIMPLE_SINGLE_RHS \ : GIMPLE_INVALID_RHS), #define END_OF_BASE_TREE_CODES (unsigned char) GIMPLE_INVALID_RHS, const unsigned char gimple_rhs_class_table[] = { #include "all-tree.def" }; #undef DEFTREECODE #undef END_OF_BASE_TREE_CODES /* For the definitive definition of GIMPLE, see doc/tree-ssa.texi. */ /* Validation of GIMPLE expressions. */ /* Return true if OP is an acceptable tree node to be used as a GIMPLE operand. */ bool is_gimple_operand (const_tree op) { return op && get_gimple_rhs_class (TREE_CODE (op)) == GIMPLE_SINGLE_RHS; } /* Returns true iff T is a valid RHS for an assignment to a renamed user -- or front-end generated artificial -- variable. */ bool is_gimple_reg_rhs (tree t) { return get_gimple_rhs_class (TREE_CODE (t)) != GIMPLE_INVALID_RHS; } /* Returns true iff T is a valid RHS for an assignment to an un-renamed LHS, or for a call argument. */ bool is_gimple_mem_rhs (tree t) { /* If we're dealing with a renamable type, either source or dest must be a renamed variable. */ if (is_gimple_reg_type (TREE_TYPE (t))) return is_gimple_val (t); else return is_gimple_val (t) || is_gimple_lvalue (t); } /* Return true if T is a valid LHS for a GIMPLE assignment expression. */ bool is_gimple_lvalue (tree t) { return (is_gimple_addressable (t) || TREE_CODE (t) == WITH_SIZE_EXPR /* These are complex lvalues, but don't have addresses, so they go here. */ || TREE_CODE (t) == BIT_FIELD_REF); } /* Return true if T is a GIMPLE condition. */ bool is_gimple_condexpr (tree t) { return (is_gimple_val (t) || (COMPARISON_CLASS_P (t) && !tree_could_trap_p (t) && is_gimple_val (TREE_OPERAND (t, 0)) && is_gimple_val (TREE_OPERAND (t, 1)))); } /* Return true if T is something whose address can be taken. */ bool is_gimple_addressable (tree t) { return (is_gimple_id (t) || handled_component_p (t) || INDIRECT_REF_P (t)); } /* Return true if T is a valid gimple constant. */ bool is_gimple_constant (const_tree t) { switch (TREE_CODE (t)) { case INTEGER_CST: case REAL_CST: case FIXED_CST: case STRING_CST: case COMPLEX_CST: case VECTOR_CST: return true; /* Vector constant constructors are gimple invariant. */ case CONSTRUCTOR: if (TREE_TYPE (t) && TREE_CODE (TREE_TYPE (t)) == VECTOR_TYPE) return TREE_CONSTANT (t); else return false; default: return false; } } /* Return true if T is a gimple address. */ bool is_gimple_address (const_tree t) { tree op; if (TREE_CODE (t) != ADDR_EXPR) return false; op = TREE_OPERAND (t, 0); while (handled_component_p (op)) { if ((TREE_CODE (op) == ARRAY_REF || TREE_CODE (op) == ARRAY_RANGE_REF) && !is_gimple_val (TREE_OPERAND (op, 1))) return false; op = TREE_OPERAND (op, 0); } if (CONSTANT_CLASS_P (op) || INDIRECT_REF_P (op)) return true; switch (TREE_CODE (op)) { case PARM_DECL: case RESULT_DECL: case LABEL_DECL: case FUNCTION_DECL: case VAR_DECL: case CONST_DECL: return true; default: return false; } } /* Strip out all handled components that produce invariant offsets. */ static const_tree strip_invariant_refs (const_tree op) { while (handled_component_p (op)) { switch (TREE_CODE (op)) { case ARRAY_REF: case ARRAY_RANGE_REF: if (!is_gimple_constant (TREE_OPERAND (op, 1)) || TREE_OPERAND (op, 2) != NULL_TREE || TREE_OPERAND (op, 3) != NULL_TREE) return NULL; break; case COMPONENT_REF: if (TREE_OPERAND (op, 2) != NULL_TREE) return NULL; break; default:; } op = TREE_OPERAND (op, 0); } return op; } /* Return true if T is a gimple invariant address. */ bool is_gimple_invariant_address (const_tree t) { const_tree op; if (TREE_CODE (t) != ADDR_EXPR) return false; op = strip_invariant_refs (TREE_OPERAND (t, 0)); return op && (CONSTANT_CLASS_P (op) || decl_address_invariant_p (op)); } /* Return true if T is a gimple invariant address at IPA level (so addresses of variables on stack are not allowed). */ bool is_gimple_ip_invariant_address (const_tree t) { const_tree op; if (TREE_CODE (t) != ADDR_EXPR) return false; op = strip_invariant_refs (TREE_OPERAND (t, 0)); return op && (CONSTANT_CLASS_P (op) || decl_address_ip_invariant_p (op)); } /* Return true if T is a GIMPLE minimal invariant. It's a restricted form of function invariant. */ bool is_gimple_min_invariant (const_tree t) { if (TREE_CODE (t) == ADDR_EXPR) return is_gimple_invariant_address (t); return is_gimple_constant (t); } /* Return true if T is a GIMPLE interprocedural invariant. It's a restricted form of gimple minimal invariant. */ bool is_gimple_ip_invariant (const_tree t) { if (TREE_CODE (t) == ADDR_EXPR) return is_gimple_ip_invariant_address (t); return is_gimple_constant (t); } /* Return true if T looks like a valid GIMPLE statement. */ bool is_gimple_stmt (tree t) { const enum tree_code code = TREE_CODE (t); switch (code) { case NOP_EXPR: /* The only valid NOP_EXPR is the empty statement. */ return IS_EMPTY_STMT (t); case BIND_EXPR: case COND_EXPR: /* These are only valid if they're void. */ return TREE_TYPE (t) == NULL || VOID_TYPE_P (TREE_TYPE (t)); case SWITCH_EXPR: case GOTO_EXPR: case RETURN_EXPR: case LABEL_EXPR: case CASE_LABEL_EXPR: case TRY_CATCH_EXPR: case TRY_FINALLY_EXPR: case EH_FILTER_EXPR: case CATCH_EXPR: case ASM_EXPR: case STATEMENT_LIST: case OMP_PARALLEL: case OMP_FOR: case OMP_SECTIONS: case OMP_SECTION: case OMP_SINGLE: case OMP_MASTER: case OMP_ORDERED: case OMP_CRITICAL: case OMP_TASK: /* These are always void. */ return true; case CALL_EXPR: case MODIFY_EXPR: case PREDICT_EXPR: /* These are valid regardless of their type. */ return true; default: return false; } } /* Return true if T is a variable. */ bool is_gimple_variable (tree t) { return (TREE_CODE (t) == VAR_DECL || TREE_CODE (t) == PARM_DECL || TREE_CODE (t) == RESULT_DECL || TREE_CODE (t) == SSA_NAME); } /* Return true if T is a GIMPLE identifier (something with an address). */ bool is_gimple_id (tree t) { return (is_gimple_variable (t) || TREE_CODE (t) == FUNCTION_DECL || TREE_CODE (t) == LABEL_DECL || TREE_CODE (t) == CONST_DECL /* Allow string constants, since they are addressable. */ || TREE_CODE (t) == STRING_CST); } /* Return true if TYPE is a suitable type for a scalar register variable. */ bool is_gimple_reg_type (tree type) { return !AGGREGATE_TYPE_P (type); } /* Return true if T is a non-aggregate register variable. */ bool is_gimple_reg (tree t) { if (TREE_CODE (t) == SSA_NAME) t = SSA_NAME_VAR (t); if (!is_gimple_variable (t)) return false; if (!is_gimple_reg_type (TREE_TYPE (t))) return false; /* A volatile decl is not acceptable because we can't reuse it as needed. We need to copy it into a temp first. */ if (TREE_THIS_VOLATILE (t)) return false; /* We define "registers" as things that can be renamed as needed, which with our infrastructure does not apply to memory. */ if (needs_to_live_in_memory (t)) return false; /* Hard register variables are an interesting case. For those that are call-clobbered, we don't know where all the calls are, since we don't (want to) take into account which operations will turn into libcalls at the rtl level. For those that are call-saved, we don't currently model the fact that calls may in fact change global hard registers, nor do we examine ASM_CLOBBERS at the tree level, and so miss variable changes that might imply. All around, it seems safest to not do too much optimization with these at the tree level at all. We'll have to rely on the rtl optimizers to clean this up, as there we've got all the appropriate bits exposed. */ if (TREE_CODE (t) == VAR_DECL && DECL_HARD_REGISTER (t)) return false; /* Complex and vector values must have been put into SSA-like form. That is, no assignments to the individual components. */ if (TREE_CODE (TREE_TYPE (t)) == COMPLEX_TYPE || TREE_CODE (TREE_TYPE (t)) == VECTOR_TYPE) return DECL_GIMPLE_REG_P (t); return true; } /* Return true if T is a GIMPLE variable whose address is not needed. */ bool is_gimple_non_addressable (tree t) { if (TREE_CODE (t) == SSA_NAME) t = SSA_NAME_VAR (t); return (is_gimple_variable (t) && ! needs_to_live_in_memory (t)); } /* Return true if T is a GIMPLE rvalue, i.e. an identifier or a constant. */ bool is_gimple_val (tree t) { /* Make loads from volatiles and memory vars explicit. */ if (is_gimple_variable (t) && is_gimple_reg_type (TREE_TYPE (t)) && !is_gimple_reg (t)) return false; return (is_gimple_variable (t) || is_gimple_min_invariant (t)); } /* Similarly, but accept hard registers as inputs to asm statements. */ bool is_gimple_asm_val (tree t) { if (TREE_CODE (t) == VAR_DECL && DECL_HARD_REGISTER (t)) return true; return is_gimple_val (t); } /* Return true if T is a GIMPLE minimal lvalue. */ bool is_gimple_min_lval (tree t) { if (!(t = CONST_CAST_TREE (strip_invariant_refs (t)))) return false; return (is_gimple_id (t) || TREE_CODE (t) == INDIRECT_REF); } /* Return true if T is a typecast operation. */ bool is_gimple_cast (tree t) { return (CONVERT_EXPR_P (t) || TREE_CODE (t) == FIX_TRUNC_EXPR); } /* Return true if T is a valid function operand of a CALL_EXPR. */ bool is_gimple_call_addr (tree t) { return (TREE_CODE (t) == OBJ_TYPE_REF || is_gimple_val (t)); } /* If T makes a function call, return the corresponding CALL_EXPR operand. Otherwise, return NULL_TREE. */ tree get_call_expr_in (tree t) { if (TREE_CODE (t) == MODIFY_EXPR) t = TREE_OPERAND (t, 1); if (TREE_CODE (t) == WITH_SIZE_EXPR) t = TREE_OPERAND (t, 0); if (TREE_CODE (t) == CALL_EXPR) return t; return NULL_TREE; } /* Given a memory reference expression T, return its base address. The base address of a memory reference expression is the main object being referenced. For instance, the base address for 'array[i].fld[j]' is 'array'. You can think of this as stripping away the offset part from a memory address. This function calls handled_component_p to strip away all the inner parts of the memory reference until it reaches the base object. */ tree get_base_address (tree t) { while (handled_component_p (t)) t = TREE_OPERAND (t, 0); if (SSA_VAR_P (t) || TREE_CODE (t) == STRING_CST || TREE_CODE (t) == CONSTRUCTOR || INDIRECT_REF_P (t)) return t; else return NULL_TREE; } void recalculate_side_effects (tree t) { enum tree_code code = TREE_CODE (t); int len = TREE_OPERAND_LENGTH (t); int i; switch (TREE_CODE_CLASS (code)) { case tcc_expression: switch (code) { case INIT_EXPR: case MODIFY_EXPR: case VA_ARG_EXPR: case PREDECREMENT_EXPR: case PREINCREMENT_EXPR: case POSTDECREMENT_EXPR: case POSTINCREMENT_EXPR: /* All of these have side-effects, no matter what their operands are. */ return; default: break; } /* Fall through. */ case tcc_comparison: /* a comparison expression */ case tcc_unary: /* a unary arithmetic expression */ case tcc_binary: /* a binary arithmetic expression */ case tcc_reference: /* a reference */ case tcc_vl_exp: /* a function call */ TREE_SIDE_EFFECTS (t) = TREE_THIS_VOLATILE (t); for (i = 0; i < len; ++i) { tree op = TREE_OPERAND (t, i); if (op && TREE_SIDE_EFFECTS (op)) TREE_SIDE_EFFECTS (t) = 1; } break; case tcc_constant: /* No side-effects. */ return; default: gcc_unreachable (); } } /* Canonicalize a tree T for use in a COND_EXPR as conditional. Returns a canonicalized tree that is valid for a COND_EXPR or NULL_TREE, if we failed to create one. */ tree canonicalize_cond_expr_cond (tree t) { /* Strip conversions around boolean operations. */ if (CONVERT_EXPR_P (t) && truth_value_p (TREE_CODE (TREE_OPERAND (t, 0)))) t = TREE_OPERAND (t, 0); /* For (bool)x use x != 0. */ if (CONVERT_EXPR_P (t) && TREE_CODE (TREE_TYPE (t)) == BOOLEAN_TYPE) { tree top0 = TREE_OPERAND (t, 0); t = build2 (NE_EXPR, TREE_TYPE (t), top0, build_int_cst (TREE_TYPE (top0), 0)); } /* For !x use x == 0. */ else if (TREE_CODE (t) == TRUTH_NOT_EXPR) { tree top0 = TREE_OPERAND (t, 0); t = build2 (EQ_EXPR, TREE_TYPE (t), top0, build_int_cst (TREE_TYPE (top0), 0)); } /* For cmp ? 1 : 0 use cmp. */ else if (TREE_CODE (t) == COND_EXPR && COMPARISON_CLASS_P (TREE_OPERAND (t, 0)) && integer_onep (TREE_OPERAND (t, 1)) && integer_zerop (TREE_OPERAND (t, 2))) { tree top0 = TREE_OPERAND (t, 0); t = build2 (TREE_CODE (top0), TREE_TYPE (t), TREE_OPERAND (top0, 0), TREE_OPERAND (top0, 1)); } if (is_gimple_condexpr (t)) return t; return NULL_TREE; } /* Build a GIMPLE_CALL identical to STMT but skipping the arguments in the positions marked by the set ARGS_TO_SKIP. */ gimple gimple_call_copy_skip_args (gimple stmt, bitmap args_to_skip) { int i; tree fn = gimple_call_fn (stmt); int nargs = gimple_call_num_args (stmt); VEC(tree, heap) *vargs = VEC_alloc (tree, heap, nargs); gimple new_stmt; for (i = 0; i < nargs; i++) if (!bitmap_bit_p (args_to_skip, i)) VEC_quick_push (tree, vargs, gimple_call_arg (stmt, i)); new_stmt = gimple_build_call_vec (fn, vargs); VEC_free (tree, heap, vargs); if (gimple_call_lhs (stmt)) gimple_call_set_lhs (new_stmt, gimple_call_lhs (stmt)); gimple_set_vuse (new_stmt, gimple_vuse (stmt)); gimple_set_vdef (new_stmt, gimple_vdef (stmt)); gimple_set_block (new_stmt, gimple_block (stmt)); if (gimple_has_location (stmt)) gimple_set_location (new_stmt, gimple_location (stmt)); gimple_call_copy_flags (new_stmt, stmt); gimple_call_set_chain (new_stmt, gimple_call_chain (stmt)); gimple_set_modified (new_stmt, true); return new_stmt; } static hashval_t gimple_type_hash (const void *); /* Structure used to maintain a cache of some type pairs compared by gimple_types_compatible_p when comparing aggregate types. There are four possible values for SAME_P: -2: The pair (T1, T2) has just been inserted in the table. -1: The pair (T1, T2) is currently being compared. 0: T1 and T2 are different types. 1: T1 and T2 are the same type. This table is only used when comparing aggregate types to avoid infinite recursion due to self-referential types. */ struct type_pair_d { unsigned int uid1; unsigned int uid2; int same_p; }; typedef struct type_pair_d *type_pair_t; /* Return a hash value for the type pair pointed-to by P. */ static hashval_t type_pair_hash (const void *p) { const struct type_pair_d *pair = (const struct type_pair_d *) p; hashval_t val1 = pair->uid1; hashval_t val2 = pair->uid2; return (iterative_hash_hashval_t (val2, val1) ^ iterative_hash_hashval_t (val1, val2)); } /* Compare two type pairs pointed-to by P1 and P2. */ static int type_pair_eq (const void *p1, const void *p2) { const struct type_pair_d *pair1 = (const struct type_pair_d *) p1; const struct type_pair_d *pair2 = (const struct type_pair_d *) p2; return ((pair1->uid1 == pair2->uid1 && pair1->uid2 == pair2->uid2) || (pair1->uid1 == pair2->uid2 && pair1->uid2 == pair2->uid1)); } /* Lookup the pair of types T1 and T2 in *VISITED_P. Insert a new entry if none existed. */ static type_pair_t lookup_type_pair (tree t1, tree t2, htab_t *visited_p, struct obstack *ob_p) { struct type_pair_d pair; type_pair_t p; void **slot; if (*visited_p == NULL) { *visited_p = htab_create (251, type_pair_hash, type_pair_eq, NULL); gcc_obstack_init (ob_p); } pair.uid1 = TYPE_UID (t1); pair.uid2 = TYPE_UID (t2); slot = htab_find_slot (*visited_p, &pair, INSERT); if (*slot) p = *((type_pair_t *) slot); else { p = XOBNEW (ob_p, struct type_pair_d); p->uid1 = TYPE_UID (t1); p->uid2 = TYPE_UID (t2); p->same_p = -2; *slot = (void *) p; } return p; } /* Return true if T1 and T2 have the same name. If FOR_COMPLETION_P is true then if any type has no name return false, otherwise return true if both types have no names. */ static bool compare_type_names_p (tree t1, tree t2, bool for_completion_p) { tree name1 = TYPE_NAME (t1); tree name2 = TYPE_NAME (t2); /* Consider anonymous types all unique for completion. */ if (for_completion_p && (!name1 || !name2)) return false; if (name1 && TREE_CODE (name1) == TYPE_DECL) { name1 = DECL_NAME (name1); if (for_completion_p && !name1) return false; } gcc_assert (!name1 || TREE_CODE (name1) == IDENTIFIER_NODE); if (name2 && TREE_CODE (name2) == TYPE_DECL) { name2 = DECL_NAME (name2); if (for_completion_p && !name2) return false; } gcc_assert (!name2 || TREE_CODE (name2) == IDENTIFIER_NODE); /* Identifiers can be compared with pointer equality rather than a string comparison. */ if (name1 == name2) return true; return false; } /* Return true if the field decls F1 and F2 are at the same offset. */ bool compare_field_offset (tree f1, tree f2) { if (DECL_OFFSET_ALIGN (f1) == DECL_OFFSET_ALIGN (f2)) return (operand_equal_p (DECL_FIELD_OFFSET (f1), DECL_FIELD_OFFSET (f2), 0) && tree_int_cst_equal (DECL_FIELD_BIT_OFFSET (f1), DECL_FIELD_BIT_OFFSET (f2))); /* Fortran and C do not always agree on what DECL_OFFSET_ALIGN should be, so handle differing ones specially by decomposing the offset into a byte and bit offset manually. */ if (host_integerp (DECL_FIELD_OFFSET (f1), 0) && host_integerp (DECL_FIELD_OFFSET (f2), 0)) { unsigned HOST_WIDE_INT byte_offset1, byte_offset2; unsigned HOST_WIDE_INT bit_offset1, bit_offset2; bit_offset1 = TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (f1)); byte_offset1 = (TREE_INT_CST_LOW (DECL_FIELD_OFFSET (f1)) + bit_offset1 / BITS_PER_UNIT); bit_offset2 = TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (f2)); byte_offset2 = (TREE_INT_CST_LOW (DECL_FIELD_OFFSET (f2)) + bit_offset2 / BITS_PER_UNIT); if (byte_offset1 != byte_offset2) return false; return bit_offset1 % BITS_PER_UNIT == bit_offset2 % BITS_PER_UNIT; } return false; } /* Return 1 iff T1 and T2 are structurally identical. Otherwise, return 0. */ static int gimple_types_compatible_p (tree t1, tree t2) { type_pair_t p = NULL; /* Check first for the obvious case of pointer identity. */ if (t1 == t2) return 1; /* Check that we have two types to compare. */ if (t1 == NULL_TREE || t2 == NULL_TREE) return 0; /* Can't be the same type if the types don't have the same code. */ if (TREE_CODE (t1) != TREE_CODE (t2)) return 0; /* Can't be the same type if they have different CV qualifiers. */ if (TYPE_QUALS (t1) != TYPE_QUALS (t2)) return 0; /* Void types are always the same. */ if (TREE_CODE (t1) == VOID_TYPE) return 1; /* For numerical types do some simple checks before doing three hashtable queries. */ if (INTEGRAL_TYPE_P (t1) || SCALAR_FLOAT_TYPE_P (t1) || FIXED_POINT_TYPE_P (t1) || TREE_CODE (t1) == VECTOR_TYPE || TREE_CODE (t1) == COMPLEX_TYPE || TREE_CODE (t1) == OFFSET_TYPE) { /* Can't be the same type if they have different alignment, sign, precision or mode. */ if (TYPE_ALIGN (t1) != TYPE_ALIGN (t2) || TYPE_PRECISION (t1) != TYPE_PRECISION (t2) || TYPE_MODE (t1) != TYPE_MODE (t2) || TYPE_UNSIGNED (t1) != TYPE_UNSIGNED (t2)) return 0; if (TREE_CODE (t1) == INTEGER_TYPE && (TYPE_IS_SIZETYPE (t1) != TYPE_IS_SIZETYPE (t2) || TYPE_STRING_FLAG (t1) != TYPE_STRING_FLAG (t2))) return 0; /* That's all we need to check for float and fixed-point types. */ if (SCALAR_FLOAT_TYPE_P (t1) || FIXED_POINT_TYPE_P (t1)) return 1; /* Perform cheap tail-recursion for vector and complex types. */ if (TREE_CODE (t1) == VECTOR_TYPE || TREE_CODE (t1) == COMPLEX_TYPE) return gimple_types_compatible_p (TREE_TYPE (t1), TREE_TYPE (t2)); /* For integral types fall thru to more complex checks. */ } /* If the hash values of t1 and t2 are different the types can't possibly be the same. This helps keeping the type-pair hashtable small, only tracking comparisons for hash collisions. */ if (gimple_type_hash (t1) != gimple_type_hash (t2)) return 0; /* If we've visited this type pair before (in the case of aggregates with self-referential types), and we made a decision, return it. */ p = lookup_type_pair (t1, t2, >c_visited, >c_ob); if (p->same_p == 0 || p->same_p == 1) { /* We have already decided whether T1 and T2 are the same, return the cached result. */ return p->same_p == 1; } else if (p->same_p == -1) { /* We are currently comparing this pair of types, assume that they are the same and let the caller decide. */ return 1; } gcc_assert (p->same_p == -2); /* Mark the (T1, T2) comparison in progress. */ p->same_p = -1; /* If their attributes are not the same they can't be the same type. */ if (!attribute_list_equal (TYPE_ATTRIBUTES (t1), TYPE_ATTRIBUTES (t2))) goto different_types; /* Do type-specific comparisons. */ switch (TREE_CODE (t1)) { case ARRAY_TYPE: /* Array types are the same if the element types are the same and the number of elements are the same. */ if (!gimple_types_compatible_p (TREE_TYPE (t1), TREE_TYPE (t2)) || TYPE_STRING_FLAG (t1) != TYPE_STRING_FLAG (t2) || TYPE_NONALIASED_COMPONENT (t1) != TYPE_NONALIASED_COMPONENT (t2)) goto different_types; else { tree i1 = TYPE_DOMAIN (t1); tree i2 = TYPE_DOMAIN (t2); /* For an incomplete external array, the type domain can be NULL_TREE. Check this condition also. */ if (i1 == NULL_TREE && i2 == NULL_TREE) goto same_types; else if (i1 == NULL_TREE || i2 == NULL_TREE) goto different_types; /* If for a complete array type the possibly gimplified sizes are different the types are different. */ else if (((TYPE_SIZE (i1) != NULL) ^ (TYPE_SIZE (i2) != NULL)) || (TYPE_SIZE (i1) && TYPE_SIZE (i2) && !operand_equal_p (TYPE_SIZE (i1), TYPE_SIZE (i2), 0))) goto different_types; else { tree min1 = TYPE_MIN_VALUE (i1); tree min2 = TYPE_MIN_VALUE (i2); tree max1 = TYPE_MAX_VALUE (i1); tree max2 = TYPE_MAX_VALUE (i2); /* The minimum/maximum values have to be the same. */ if ((min1 == min2 || (min1 && min2 && operand_equal_p (min1, min2, 0))) && (max1 == max2 || (max1 && max2 && operand_equal_p (max1, max2, 0)))) goto same_types; else goto different_types; } } case METHOD_TYPE: /* Method types should belong to the same class. */ if (!gimple_types_compatible_p (TYPE_METHOD_BASETYPE (t1), TYPE_METHOD_BASETYPE (t2))) goto different_types; /* Fallthru */ case FUNCTION_TYPE: /* Function types are the same if the return type and arguments types are the same. */ if (!gimple_types_compatible_p (TREE_TYPE (t1), TREE_TYPE (t2))) goto different_types; else { if (!targetm.comp_type_attributes (t1, t2)) goto different_types; if (TYPE_ARG_TYPES (t1) == TYPE_ARG_TYPES (t2)) goto same_types; else { tree parms1, parms2; for (parms1 = TYPE_ARG_TYPES (t1), parms2 = TYPE_ARG_TYPES (t2); parms1 && parms2; parms1 = TREE_CHAIN (parms1), parms2 = TREE_CHAIN (parms2)) { if (!gimple_types_compatible_p (TREE_VALUE (parms1), TREE_VALUE (parms2))) goto different_types; } if (parms1 || parms2) goto different_types; goto same_types; } } case OFFSET_TYPE: { if (!gimple_types_compatible_p (TREE_TYPE (t1), TREE_TYPE (t2)) || !gimple_types_compatible_p (TYPE_OFFSET_BASETYPE (t1), TYPE_OFFSET_BASETYPE (t2))) goto different_types; goto same_types; } case POINTER_TYPE: case REFERENCE_TYPE: { /* If the two pointers have different ref-all attributes, they can't be the same type. */ if (TYPE_REF_CAN_ALIAS_ALL (t1) != TYPE_REF_CAN_ALIAS_ALL (t2)) goto different_types; /* If one pointer points to an incomplete type variant of the other pointed-to type they are the same. */ if (TREE_CODE (TREE_TYPE (t1)) == TREE_CODE (TREE_TYPE (t2)) && RECORD_OR_UNION_TYPE_P (TREE_TYPE (t1)) && (!COMPLETE_TYPE_P (TREE_TYPE (t1)) || !COMPLETE_TYPE_P (TREE_TYPE (t2))) && TYPE_QUALS (TREE_TYPE (t1)) == TYPE_QUALS (TREE_TYPE (t2)) && compare_type_names_p (TYPE_MAIN_VARIANT (TREE_TYPE (t1)), TYPE_MAIN_VARIANT (TREE_TYPE (t2)), true)) { /* Replace the pointed-to incomplete type with the complete one. ??? This simple name-based merging causes at least some of the ICEs in canonicalizing FIELD_DECLs during stmt read. For example in GCC we have two different struct deps and we mismatch the use in struct cpp_reader in sched-int.h vs. mkdeps.c. Of course the whole exercise is for TBAA with structs which contain pointers to incomplete types in one unit and to complete ones in another. So we probably should merge these types only with more context. */ if (COMPLETE_TYPE_P (TREE_TYPE (t2))) TREE_TYPE (t1) = TREE_TYPE (t2); else TREE_TYPE (t2) = TREE_TYPE (t1); goto same_types; } /* Otherwise, pointer and reference types are the same if the pointed-to types are the same. */ if (gimple_types_compatible_p (TREE_TYPE (t1), TREE_TYPE (t2))) goto same_types; goto different_types; } case INTEGER_TYPE: case BOOLEAN_TYPE: { tree min1 = TYPE_MIN_VALUE (t1); tree max1 = TYPE_MAX_VALUE (t1); tree min2 = TYPE_MIN_VALUE (t2); tree max2 = TYPE_MAX_VALUE (t2); bool min_equal_p = false; bool max_equal_p = false; /* If either type has a minimum value, the other type must have the same. */ if (min1 == NULL_TREE && min2 == NULL_TREE) min_equal_p = true; else if (min1 && min2 && operand_equal_p (min1, min2, 0)) min_equal_p = true; /* Likewise, if either type has a maximum value, the other type must have the same. */ if (max1 == NULL_TREE && max2 == NULL_TREE) max_equal_p = true; else if (max1 && max2 && operand_equal_p (max1, max2, 0)) max_equal_p = true; if (!min_equal_p || !max_equal_p) goto different_types; goto same_types; } case ENUMERAL_TYPE: { /* FIXME lto, we cannot check bounds on enumeral types because different front ends will produce different values. In C, enumeral types are integers, while in C++ each element will have its own symbolic value. We should decide how enums are to be represented in GIMPLE and have each front end lower to that. */ tree v1, v2; /* For enumeral types, all the values must be the same. */ if (TYPE_VALUES (t1) == TYPE_VALUES (t2)) goto same_types; for (v1 = TYPE_VALUES (t1), v2 = TYPE_VALUES (t2); v1 && v2; v1 = TREE_CHAIN (v1), v2 = TREE_CHAIN (v2)) { tree c1 = TREE_VALUE (v1); tree c2 = TREE_VALUE (v2); if (TREE_CODE (c1) == CONST_DECL) c1 = DECL_INITIAL (c1); if (TREE_CODE (c2) == CONST_DECL) c2 = DECL_INITIAL (c2); if (tree_int_cst_equal (c1, c2) != 1) goto different_types; } /* If one enumeration has more values than the other, they are not the same. */ if (v1 || v2) goto different_types; goto same_types; } case RECORD_TYPE: case UNION_TYPE: case QUAL_UNION_TYPE: { tree f1, f2; /* If one type requires structural equality checks and the other doesn't, do not merge the types. */ if (TYPE_STRUCTURAL_EQUALITY_P (t1) != TYPE_STRUCTURAL_EQUALITY_P (t2)) goto different_types; /* The struct tags shall compare equal. */ if (!compare_type_names_p (TYPE_MAIN_VARIANT (t1), TYPE_MAIN_VARIANT (t2), false)) goto different_types; /* For aggregate types, all the fields must be the same. */ for (f1 = TYPE_FIELDS (t1), f2 = TYPE_FIELDS (t2); f1 && f2; f1 = TREE_CHAIN (f1), f2 = TREE_CHAIN (f2)) { /* The fields must have the same name, offset and type. */ if (DECL_NAME (f1) != DECL_NAME (f2) || DECL_NONADDRESSABLE_P (f1) != DECL_NONADDRESSABLE_P (f2) || !compare_field_offset (f1, f2) || !gimple_types_compatible_p (TREE_TYPE (f1), TREE_TYPE (f2))) goto different_types; } /* If one aggregate has more fields than the other, they are not the same. */ if (f1 || f2) goto different_types; goto same_types; } default: gcc_unreachable (); } /* Common exit path for types that are not compatible. */ different_types: p->same_p = 0; return 0; /* Common exit path for types that are compatible. */ same_types: p->same_p = 1; return 1; } /* Per pointer state for the SCC finding. The on_sccstack flag is not strictly required, it is true when there is no hash value recorded for the type and false otherwise. But querying that is slower. */ struct sccs { unsigned int dfsnum; unsigned int low; bool on_sccstack; hashval_t hash; }; static unsigned int next_dfs_num; static hashval_t iterative_hash_gimple_type (tree, hashval_t, VEC(tree, heap) **, struct pointer_map_t *, struct obstack *); /* DFS visit the edge from the callers type with state *STATE to T. Update the callers type hash V with the hash for T if it is not part of the SCC containing the callers type and return it. SCCSTACK, SCCSTATE and SCCSTATE_OBSTACK are state for the DFS walk done. */ static hashval_t visit (tree t, struct sccs *state, hashval_t v, VEC (tree, heap) **sccstack, struct pointer_map_t *sccstate, struct obstack *sccstate_obstack) { struct sccs *cstate = NULL; void **slot; /* If there is a hash value recorded for this type then it can't possibly be part of our parent SCC. Simply mix in its hash. */ if ((slot = pointer_map_contains (type_hash_cache, t))) return iterative_hash_hashval_t ((hashval_t) (size_t) *slot, v); if ((slot = pointer_map_contains (sccstate, t)) != NULL) cstate = (struct sccs *)*slot; if (!cstate) { hashval_t tem; /* Not yet visited. DFS recurse. */ tem = iterative_hash_gimple_type (t, v, sccstack, sccstate, sccstate_obstack); if (!cstate) cstate = (struct sccs *)* pointer_map_contains (sccstate, t); state->low = MIN (state->low, cstate->low); /* If the type is no longer on the SCC stack and thus is not part of the parents SCC mix in its hash value. Otherwise we will ignore the type for hashing purposes and return the unaltered hash value. */ if (!cstate->on_sccstack) return tem; } if (cstate->dfsnum < state->dfsnum && cstate->on_sccstack) state->low = MIN (cstate->dfsnum, state->low); /* We are part of our parents SCC, skip this type during hashing and return the unaltered hash value. */ return v; } /* Hash NAME with the previous hash value V and return it. */ static hashval_t iterative_hash_name (tree name, hashval_t v) { if (!name) return v; if (TREE_CODE (name) == TYPE_DECL) name = DECL_NAME (name); if (!name) return v; gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE); return iterative_hash_object (IDENTIFIER_HASH_VALUE (name), v); } /* Returning a hash value for gimple type TYPE combined with VAL. SCCSTACK, SCCSTATE and SCCSTATE_OBSTACK are state for the DFS walk done. To hash a type we end up hashing in types that are reachable. Through pointers we can end up with cycles which messes up the required property that we need to compute the same hash value for structurally equivalent types. To avoid this we have to hash all types in a cycle (the SCC) in a commutative way. The easiest way is to not mix in the hashes of the SCC members at all. To make this work we have to delay setting the hash values of the SCC until it is complete. */ static hashval_t iterative_hash_gimple_type (tree type, hashval_t val, VEC(tree, heap) **sccstack, struct pointer_map_t *sccstate, struct obstack *sccstate_obstack) { hashval_t v; void **slot; struct sccs *state; #ifdef ENABLE_CHECKING /* Not visited during this DFS walk nor during previous walks. */ gcc_assert (!pointer_map_contains (type_hash_cache, type) && !pointer_map_contains (sccstate, type)); #endif state = XOBNEW (sccstate_obstack, struct sccs); *pointer_map_insert (sccstate, type) = state; VEC_safe_push (tree, heap, *sccstack, type); state->dfsnum = next_dfs_num++; state->low = state->dfsnum; state->on_sccstack = true; /* Combine a few common features of types so that types are grouped into smaller sets; when searching for existing matching types to merge, only existing types having the same features as the new type will be checked. */ v = iterative_hash_hashval_t (TREE_CODE (type), 0); v = iterative_hash_hashval_t (TYPE_QUALS (type), v); v = iterative_hash_hashval_t (TREE_ADDRESSABLE (type), v); /* Do not hash the types size as this will cause differences in hash values for the complete vs. the incomplete type variant. */ /* Incorporate common features of numerical types. */ if (INTEGRAL_TYPE_P (type) || SCALAR_FLOAT_TYPE_P (type) || FIXED_POINT_TYPE_P (type)) { v = iterative_hash_hashval_t (TYPE_PRECISION (type), v); v = iterative_hash_hashval_t (TYPE_MODE (type), v); v = iterative_hash_hashval_t (TYPE_UNSIGNED (type), v); } /* For pointer and reference types, fold in information about the type pointed to but do not recurse into possibly incomplete types to avoid hash differences for complete vs. incomplete types. */ if (POINTER_TYPE_P (type)) { if (RECORD_OR_UNION_TYPE_P (TREE_TYPE (type))) { v = iterative_hash_hashval_t (TREE_CODE (TREE_TYPE (type)), v); v = iterative_hash_name (TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (type))), v); } else v = visit (TREE_TYPE (type), state, v, sccstack, sccstate, sccstate_obstack); } /* For integer types hash the types min/max values and the string flag. */ if (TREE_CODE (type) == INTEGER_TYPE) { /* OMP lowering can introduce error_mark_node in place of random local decls in types. */ if (TYPE_MIN_VALUE (type) != error_mark_node) v = iterative_hash_expr (TYPE_MIN_VALUE (type), v); if (TYPE_MAX_VALUE (type) != error_mark_node) v = iterative_hash_expr (TYPE_MAX_VALUE (type), v); v = iterative_hash_hashval_t (TYPE_STRING_FLAG (type), v); } /* For array types hash their domain and the string flag. */ if (TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type)) { v = iterative_hash_hashval_t (TYPE_STRING_FLAG (type), v); v = visit (TYPE_DOMAIN (type), state, v, sccstack, sccstate, sccstate_obstack); } /* Recurse for aggregates with a single element type. */ if (TREE_CODE (type) == ARRAY_TYPE || TREE_CODE (type) == COMPLEX_TYPE || TREE_CODE (type) == VECTOR_TYPE) v = visit (TREE_TYPE (type), state, v, sccstack, sccstate, sccstate_obstack); /* Incorporate function return and argument types. */ if (TREE_CODE (type) == FUNCTION_TYPE || TREE_CODE (type) == METHOD_TYPE) { unsigned na; tree p; /* For method types also incorporate their parent class. */ if (TREE_CODE (type) == METHOD_TYPE) v = visit (TYPE_METHOD_BASETYPE (type), state, v, sccstack, sccstate, sccstate_obstack); v = visit (TREE_TYPE (type), state, v, sccstack, sccstate, sccstate_obstack); for (p = TYPE_ARG_TYPES (type), na = 0; p; p = TREE_CHAIN (p)) { v = visit (TREE_VALUE (p), state, v, sccstack, sccstate, sccstate_obstack); na++; } v = iterative_hash_hashval_t (na, v); } if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE || TREE_CODE (type) == QUAL_UNION_TYPE) { unsigned nf; tree f; v = iterative_hash_name (TYPE_NAME (TYPE_MAIN_VARIANT (type)), v); for (f = TYPE_FIELDS (type), nf = 0; f; f = TREE_CHAIN (f)) { v = iterative_hash_name (DECL_NAME (f), v); v = visit (TREE_TYPE (f), state, v, sccstack, sccstate, sccstate_obstack); nf++; } v = iterative_hash_hashval_t (nf, v); } /* Record hash for us. */ state->hash = v; /* See if we found an SCC. */ if (state->low == state->dfsnum) { tree x; /* Pop off the SCC and set its hash values. */ do { struct sccs *cstate; x = VEC_pop (tree, *sccstack); gcc_assert (!pointer_map_contains (type_hash_cache, x)); cstate = (struct sccs *)*pointer_map_contains (sccstate, x); cstate->on_sccstack = false; slot = pointer_map_insert (type_hash_cache, x); *slot = (void *) (size_t) cstate->hash; } while (x != type); } return iterative_hash_hashval_t (v, val); } /* Returns a hash value for P (assumed to be a type). The hash value is computed using some distinguishing features of the type. Note that we cannot use pointer hashing here as we may be dealing with two distinct instances of the same type. This function should produce the same hash value for two compatible types according to gimple_types_compatible_p. */ static hashval_t gimple_type_hash (const void *p) { const_tree t = (const_tree) p; VEC(tree, heap) *sccstack = NULL; struct pointer_map_t *sccstate; struct obstack sccstate_obstack; hashval_t val; void **slot; if (type_hash_cache == NULL) type_hash_cache = pointer_map_create (); if ((slot = pointer_map_contains (type_hash_cache, p)) != NULL) return iterative_hash_hashval_t ((hashval_t) (size_t) *slot, 0); /* Perform a DFS walk and pre-hash all reachable types. */ next_dfs_num = 1; sccstate = pointer_map_create (); gcc_obstack_init (&sccstate_obstack); val = iterative_hash_gimple_type (CONST_CAST_TREE (t), 0, &sccstack, sccstate, &sccstate_obstack); VEC_free (tree, heap, sccstack); pointer_map_destroy (sccstate); obstack_free (&sccstate_obstack, NULL); return val; } /* Returns nonzero if P1 and P2 are equal. */ static int gimple_type_eq (const void *p1, const void *p2) { const_tree t1 = (const_tree) p1; const_tree t2 = (const_tree) p2; return gimple_types_compatible_p (CONST_CAST_TREE (t1), CONST_CAST_TREE (t2)); } /* Register type T in the global type table gimple_types. If another type T', compatible with T, already existed in gimple_types then return T', otherwise return T. This is used by LTO to merge identical types read from different TUs. */ tree gimple_register_type (tree t) { void **slot; gcc_assert (TYPE_P (t)); /* Always register the main variant first. This is important so we pick up the non-typedef variants as canonical, otherwise we'll end up taking typedef ids for structure tags during comparison. */ if (TYPE_MAIN_VARIANT (t) != t) gimple_register_type (TYPE_MAIN_VARIANT (t)); if (gimple_types == NULL) gimple_types = htab_create (16381, gimple_type_hash, gimple_type_eq, 0); slot = htab_find_slot (gimple_types, t, INSERT); if (*slot && *(tree *)slot != t) { tree new_type = (tree) *((tree *) slot); /* Do not merge types with different addressability. */ gcc_assert (TREE_ADDRESSABLE (t) == TREE_ADDRESSABLE (new_type)); /* If t is not its main variant then make t unreachable from its main variant list. Otherwise we'd queue up a lot of duplicates there. */ if (t != TYPE_MAIN_VARIANT (t)) { tree tem = TYPE_MAIN_VARIANT (t); while (tem && TYPE_NEXT_VARIANT (tem) != t) tem = TYPE_NEXT_VARIANT (tem); if (tem) TYPE_NEXT_VARIANT (tem) = TYPE_NEXT_VARIANT (t); TYPE_NEXT_VARIANT (t) = NULL_TREE; } /* If we are a pointer then remove us from the pointer-to or reference-to chain. Otherwise we'd queue up a lot of duplicates there. */ if (TREE_CODE (t) == POINTER_TYPE) { if (TYPE_POINTER_TO (TREE_TYPE (t)) == t) TYPE_POINTER_TO (TREE_TYPE (t)) = TYPE_NEXT_PTR_TO (t); else { tree tem = TYPE_POINTER_TO (TREE_TYPE (t)); while (tem && TYPE_NEXT_PTR_TO (tem) != t) tem = TYPE_NEXT_PTR_TO (tem); if (tem) TYPE_NEXT_PTR_TO (tem) = TYPE_NEXT_PTR_TO (t); } TYPE_NEXT_PTR_TO (t) = NULL_TREE; } else if (TREE_CODE (t) == REFERENCE_TYPE) { if (TYPE_REFERENCE_TO (TREE_TYPE (t)) == t) TYPE_REFERENCE_TO (TREE_TYPE (t)) = TYPE_NEXT_REF_TO (t); else { tree tem = TYPE_REFERENCE_TO (TREE_TYPE (t)); while (tem && TYPE_NEXT_REF_TO (tem) != t) tem = TYPE_NEXT_REF_TO (tem); if (tem) TYPE_NEXT_REF_TO (tem) = TYPE_NEXT_REF_TO (t); } TYPE_NEXT_REF_TO (t) = NULL_TREE; } t = new_type; } else *slot = (void *) t; return t; } /* Show statistics on references to the global type table gimple_types. */ void print_gimple_types_stats (void) { if (gimple_types) fprintf (stderr, "GIMPLE type table: size %ld, %ld elements, " "%ld searches, %ld collisions (ratio: %f)\n", (long) htab_size (gimple_types), (long) htab_elements (gimple_types), (long) gimple_types->searches, (long) gimple_types->collisions, htab_collisions (gimple_types)); else fprintf (stderr, "GIMPLE type table is empty\n"); if (gtc_visited) fprintf (stderr, "GIMPLE type comparison table: size %ld, %ld " "elements, %ld searches, %ld collisions (ratio: %f)\n", (long) htab_size (gtc_visited), (long) htab_elements (gtc_visited), (long) gtc_visited->searches, (long) gtc_visited->collisions, htab_collisions (gtc_visited)); else fprintf (stderr, "GIMPLE type comparison table is empty\n"); } /* Free the gimple type hashtables used for LTO type merging. */ void free_gimple_type_tables (void) { /* Last chance to print stats for the tables. */ if (flag_lto_report) print_gimple_types_stats (); if (gimple_types) { htab_delete (gimple_types); gimple_types = NULL; } if (type_hash_cache) { pointer_map_destroy (type_hash_cache); type_hash_cache = NULL; } if (gtc_visited) { htab_delete (gtc_visited); obstack_free (>c_ob, NULL); gtc_visited = NULL; } } /* Return a type the same as TYPE except unsigned or signed according to UNSIGNEDP. */ static tree gimple_signed_or_unsigned_type (bool unsignedp, tree type) { tree type1; type1 = TYPE_MAIN_VARIANT (type); if (type1 == signed_char_type_node || type1 == char_type_node || type1 == unsigned_char_type_node) return unsignedp ? unsigned_char_type_node : signed_char_type_node; if (type1 == integer_type_node || type1 == unsigned_type_node) return unsignedp ? unsigned_type_node : integer_type_node; if (type1 == short_integer_type_node || type1 == short_unsigned_type_node) return unsignedp ? short_unsigned_type_node : short_integer_type_node; if (type1 == long_integer_type_node || type1 == long_unsigned_type_node) return unsignedp ? long_unsigned_type_node : long_integer_type_node; if (type1 == long_long_integer_type_node || type1 == long_long_unsigned_type_node) return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node; #if HOST_BITS_PER_WIDE_INT >= 64 if (type1 == intTI_type_node || type1 == unsigned_intTI_type_node) return unsignedp ? unsigned_intTI_type_node : intTI_type_node; #endif if (type1 == intDI_type_node || type1 == unsigned_intDI_type_node) return unsignedp ? unsigned_intDI_type_node : intDI_type_node; if (type1 == intSI_type_node || type1 == unsigned_intSI_type_node) return unsignedp ? unsigned_intSI_type_node : intSI_type_node; if (type1 == intHI_type_node || type1 == unsigned_intHI_type_node) return unsignedp ? unsigned_intHI_type_node : intHI_type_node; if (type1 == intQI_type_node || type1 == unsigned_intQI_type_node) return unsignedp ? unsigned_intQI_type_node : intQI_type_node; #define GIMPLE_FIXED_TYPES(NAME) \ if (type1 == short_ ## NAME ## _type_node \ || type1 == unsigned_short_ ## NAME ## _type_node) \ return unsignedp ? unsigned_short_ ## NAME ## _type_node \ : short_ ## NAME ## _type_node; \ if (type1 == NAME ## _type_node \ || type1 == unsigned_ ## NAME ## _type_node) \ return unsignedp ? unsigned_ ## NAME ## _type_node \ : NAME ## _type_node; \ if (type1 == long_ ## NAME ## _type_node \ || type1 == unsigned_long_ ## NAME ## _type_node) \ return unsignedp ? unsigned_long_ ## NAME ## _type_node \ : long_ ## NAME ## _type_node; \ if (type1 == long_long_ ## NAME ## _type_node \ || type1 == unsigned_long_long_ ## NAME ## _type_node) \ return unsignedp ? unsigned_long_long_ ## NAME ## _type_node \ : long_long_ ## NAME ## _type_node; #define GIMPLE_FIXED_MODE_TYPES(NAME) \ if (type1 == NAME ## _type_node \ || type1 == u ## NAME ## _type_node) \ return unsignedp ? u ## NAME ## _type_node \ : NAME ## _type_node; #define GIMPLE_FIXED_TYPES_SAT(NAME) \ if (type1 == sat_ ## short_ ## NAME ## _type_node \ || type1 == sat_ ## unsigned_short_ ## NAME ## _type_node) \ return unsignedp ? sat_ ## unsigned_short_ ## NAME ## _type_node \ : sat_ ## short_ ## NAME ## _type_node; \ if (type1 == sat_ ## NAME ## _type_node \ || type1 == sat_ ## unsigned_ ## NAME ## _type_node) \ return unsignedp ? sat_ ## unsigned_ ## NAME ## _type_node \ : sat_ ## NAME ## _type_node; \ if (type1 == sat_ ## long_ ## NAME ## _type_node \ || type1 == sat_ ## unsigned_long_ ## NAME ## _type_node) \ return unsignedp ? sat_ ## unsigned_long_ ## NAME ## _type_node \ : sat_ ## long_ ## NAME ## _type_node; \ if (type1 == sat_ ## long_long_ ## NAME ## _type_node \ || type1 == sat_ ## unsigned_long_long_ ## NAME ## _type_node) \ return unsignedp ? sat_ ## unsigned_long_long_ ## NAME ## _type_node \ : sat_ ## long_long_ ## NAME ## _type_node; #define GIMPLE_FIXED_MODE_TYPES_SAT(NAME) \ if (type1 == sat_ ## NAME ## _type_node \ || type1 == sat_ ## u ## NAME ## _type_node) \ return unsignedp ? sat_ ## u ## NAME ## _type_node \ : sat_ ## NAME ## _type_node; GIMPLE_FIXED_TYPES (fract); GIMPLE_FIXED_TYPES_SAT (fract); GIMPLE_FIXED_TYPES (accum); GIMPLE_FIXED_TYPES_SAT (accum); GIMPLE_FIXED_MODE_TYPES (qq); GIMPLE_FIXED_MODE_TYPES (hq); GIMPLE_FIXED_MODE_TYPES (sq); GIMPLE_FIXED_MODE_TYPES (dq); GIMPLE_FIXED_MODE_TYPES (tq); GIMPLE_FIXED_MODE_TYPES_SAT (qq); GIMPLE_FIXED_MODE_TYPES_SAT (hq); GIMPLE_FIXED_MODE_TYPES_SAT (sq); GIMPLE_FIXED_MODE_TYPES_SAT (dq); GIMPLE_FIXED_MODE_TYPES_SAT (tq); GIMPLE_FIXED_MODE_TYPES (ha); GIMPLE_FIXED_MODE_TYPES (sa); GIMPLE_FIXED_MODE_TYPES (da); GIMPLE_FIXED_MODE_TYPES (ta); GIMPLE_FIXED_MODE_TYPES_SAT (ha); GIMPLE_FIXED_MODE_TYPES_SAT (sa); GIMPLE_FIXED_MODE_TYPES_SAT (da); GIMPLE_FIXED_MODE_TYPES_SAT (ta); /* For ENUMERAL_TYPEs in C++, must check the mode of the types, not the precision; they have precision set to match their range, but may use a wider mode to match an ABI. If we change modes, we may wind up with bad conversions. For INTEGER_TYPEs in C, must check the precision as well, so as to yield correct results for bit-field types. C++ does not have these separate bit-field types, and producing a signed or unsigned variant of an ENUMERAL_TYPE may cause other problems as well. */ if (!INTEGRAL_TYPE_P (type) || TYPE_UNSIGNED (type) == unsignedp) return type; #define TYPE_OK(node) \ (TYPE_MODE (type) == TYPE_MODE (node) \ && TYPE_PRECISION (type) == TYPE_PRECISION (node)) if (TYPE_OK (signed_char_type_node)) return unsignedp ? unsigned_char_type_node : signed_char_type_node; if (TYPE_OK (integer_type_node)) return unsignedp ? unsigned_type_node : integer_type_node; if (TYPE_OK (short_integer_type_node)) return unsignedp ? short_unsigned_type_node : short_integer_type_node; if (TYPE_OK (long_integer_type_node)) return unsignedp ? long_unsigned_type_node : long_integer_type_node; if (TYPE_OK (long_long_integer_type_node)) return (unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node); #if HOST_BITS_PER_WIDE_INT >= 64 if (TYPE_OK (intTI_type_node)) return unsignedp ? unsigned_intTI_type_node : intTI_type_node; #endif if (TYPE_OK (intDI_type_node)) return unsignedp ? unsigned_intDI_type_node : intDI_type_node; if (TYPE_OK (intSI_type_node)) return unsignedp ? unsigned_intSI_type_node : intSI_type_node; if (TYPE_OK (intHI_type_node)) return unsignedp ? unsigned_intHI_type_node : intHI_type_node; if (TYPE_OK (intQI_type_node)) return unsignedp ? unsigned_intQI_type_node : intQI_type_node; #undef GIMPLE_FIXED_TYPES #undef GIMPLE_FIXED_MODE_TYPES #undef GIMPLE_FIXED_TYPES_SAT #undef GIMPLE_FIXED_MODE_TYPES_SAT #undef TYPE_OK return build_nonstandard_integer_type (TYPE_PRECISION (type), unsignedp); } /* Return an unsigned type the same as TYPE in other respects. */ tree gimple_unsigned_type (tree type) { return gimple_signed_or_unsigned_type (true, type); } /* Return a signed type the same as TYPE in other respects. */ tree gimple_signed_type (tree type) { return gimple_signed_or_unsigned_type (false, type); } /* Return the typed-based alias set for T, which may be an expression or a type. Return -1 if we don't do anything special. */ alias_set_type gimple_get_alias_set (tree t) { tree u; /* Permit type-punning when accessing a union, provided the access is directly through the union. For example, this code does not permit taking the address of a union member and then storing through it. Even the type-punning allowed here is a GCC extension, albeit a common and useful one; the C standard says that such accesses have implementation-defined behavior. */ for (u = t; TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF; u = TREE_OPERAND (u, 0)) if (TREE_CODE (u) == COMPONENT_REF && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE) return 0; /* That's all the expressions we handle specially. */ if (!TYPE_P (t)) return -1; /* For convenience, follow the C standard when dealing with character types. Any object may be accessed via an lvalue that has character type. */ if (t == char_type_node || t == signed_char_type_node || t == unsigned_char_type_node) return 0; /* Allow aliasing between signed and unsigned variants of the same type. We treat the signed variant as canonical. */ if (TREE_CODE (t) == INTEGER_TYPE && TYPE_UNSIGNED (t)) { tree t1 = gimple_signed_type (t); /* t1 == t can happen for boolean nodes which are always unsigned. */ if (t1 != t) return get_alias_set (t1); } else if (POINTER_TYPE_P (t)) { /* From the common C and C++ langhook implementation: Unfortunately, there is no canonical form of a pointer type. In particular, if we have `typedef int I', then `int *', and `I *' are different types. So, we have to pick a canonical representative. We do this below. Technically, this approach is actually more conservative that it needs to be. In particular, `const int *' and `int *' should be in different alias sets, according to the C and C++ standard, since their types are not the same, and so, technically, an `int **' and `const int **' cannot point at the same thing. But, the standard is wrong. In particular, this code is legal C++: int *ip; int **ipp = &ip; const int* const* cipp = ipp; And, it doesn't make sense for that to be legal unless you can dereference IPP and CIPP. So, we ignore cv-qualifiers on the pointed-to types. This issue has been reported to the C++ committee. */ /* In addition to the above canonicalization issue with LTO we should also canonicalize `T (*)[]' to `T *' avoiding alias issues with pointer-to element types and pointer-to array types. Likewise we need to deal with the situation of incomplete pointed-to types and make `*(struct X **)&a' and `*(struct X {} **)&a' alias. Otherwise we will have to guarantee that all pointer-to incomplete type variants will be replaced by pointer-to complete type variants if they are available. With LTO the convenient situation of using `void *' to access and store any pointer type will also become more apparent (and `void *' is just another pointer-to incomplete type). Assigning alias-set zero to `void *' and all pointer-to incomplete types is a not appealing solution. Assigning an effective alias-set zero only affecting pointers might be - by recording proper subset relationships of all pointer alias-sets. Pointer-to function types are another grey area which needs caution. Globbing them all into one alias-set or the above effective zero set would work. */ /* For now just assign the same alias-set to all pointers. That's simple and avoids all the above problems. */ if (t != ptr_type_node) return get_alias_set (ptr_type_node); } return -1; } /* Data structure used to count the number of dereferences to PTR inside an expression. */ struct count_ptr_d { tree ptr; unsigned num_stores; unsigned num_loads; }; /* Helper for count_uses_and_derefs. Called by walk_tree to look for (ALIGN/MISALIGNED_)INDIRECT_REF nodes for the pointer passed in DATA. */ static tree count_ptr_derefs (tree *tp, int *walk_subtrees, void *data) { struct walk_stmt_info *wi_p = (struct walk_stmt_info *) data; struct count_ptr_d *count_p = (struct count_ptr_d *) wi_p->info; /* Do not walk inside ADDR_EXPR nodes. In the expression &ptr->fld, pointer 'ptr' is *not* dereferenced, it is simply used to compute the address of 'fld' as 'ptr + offsetof(fld)'. */ if (TREE_CODE (*tp) == ADDR_EXPR) { *walk_subtrees = 0; return NULL_TREE; } if (INDIRECT_REF_P (*tp) && TREE_OPERAND (*tp, 0) == count_p->ptr) { if (wi_p->is_lhs) count_p->num_stores++; else count_p->num_loads++; } return NULL_TREE; } /* Count the number of direct and indirect uses for pointer PTR in statement STMT. The number of direct uses is stored in *NUM_USES_P. Indirect references are counted separately depending on whether they are store or load operations. The counts are stored in *NUM_STORES_P and *NUM_LOADS_P. */ void count_uses_and_derefs (tree ptr, gimple stmt, unsigned *num_uses_p, unsigned *num_loads_p, unsigned *num_stores_p) { ssa_op_iter i; tree use; *num_uses_p = 0; *num_loads_p = 0; *num_stores_p = 0; /* Find out the total number of uses of PTR in STMT. */ FOR_EACH_SSA_TREE_OPERAND (use, stmt, i, SSA_OP_USE) if (use == ptr) (*num_uses_p)++; /* Now count the number of indirect references to PTR. This is truly awful, but we don't have much choice. There are no parent pointers inside INDIRECT_REFs, so an expression like '*x_1 = foo (x_1, *x_1)' needs to be traversed piece by piece to find all the indirect and direct uses of x_1 inside. The only shortcut we can take is the fact that GIMPLE only allows INDIRECT_REFs inside the expressions below. */ if (is_gimple_assign (stmt) || gimple_code (stmt) == GIMPLE_RETURN || gimple_code (stmt) == GIMPLE_ASM || is_gimple_call (stmt)) { struct walk_stmt_info wi; struct count_ptr_d count; count.ptr = ptr; count.num_stores = 0; count.num_loads = 0; memset (&wi, 0, sizeof (wi)); wi.info = &count; walk_gimple_op (stmt, count_ptr_derefs, &wi); *num_stores_p = count.num_stores; *num_loads_p = count.num_loads; } gcc_assert (*num_uses_p >= *num_loads_p + *num_stores_p); } /* From a tree operand OP return the base of a load or store operation or NULL_TREE if OP is not a load or a store. */ static tree get_base_loadstore (tree op) { while (handled_component_p (op)) op = TREE_OPERAND (op, 0); if (DECL_P (op) || INDIRECT_REF_P (op) || TREE_CODE (op) == TARGET_MEM_REF) return op; return NULL_TREE; } /* For the statement STMT call the callbacks VISIT_LOAD, VISIT_STORE and VISIT_ADDR if non-NULL on loads, store and address-taken operands passing the STMT, the base of the operand and DATA to it. The base will be either a decl, an indirect reference (including TARGET_MEM_REF) or the argument of an address expression. Returns the results of these callbacks or'ed. */ bool walk_stmt_load_store_addr_ops (gimple stmt, void *data, bool (*visit_load)(gimple, tree, void *), bool (*visit_store)(gimple, tree, void *), bool (*visit_addr)(gimple, tree, void *)) { bool ret = false; unsigned i; if (gimple_assign_single_p (stmt)) { tree lhs, rhs; if (visit_store) { lhs = get_base_loadstore (gimple_assign_lhs (stmt)); if (lhs) ret |= visit_store (stmt, lhs, data); } rhs = gimple_assign_rhs1 (stmt); while (handled_component_p (rhs)) rhs = TREE_OPERAND (rhs, 0); if (visit_addr) { if (TREE_CODE (rhs) == ADDR_EXPR) ret |= visit_addr (stmt, TREE_OPERAND (rhs, 0), data); else if (TREE_CODE (rhs) == TARGET_MEM_REF && TMR_BASE (rhs) != NULL_TREE && TREE_CODE (TMR_BASE (rhs)) == ADDR_EXPR) ret |= visit_addr (stmt, TREE_OPERAND (TMR_BASE (rhs), 0), data); else if (TREE_CODE (rhs) == OBJ_TYPE_REF && TREE_CODE (OBJ_TYPE_REF_OBJECT (rhs)) == ADDR_EXPR) ret |= visit_addr (stmt, TREE_OPERAND (OBJ_TYPE_REF_OBJECT (rhs), 0), data); lhs = gimple_assign_lhs (stmt); if (TREE_CODE (lhs) == TARGET_MEM_REF && TMR_BASE (lhs) != NULL_TREE && TREE_CODE (TMR_BASE (lhs)) == ADDR_EXPR) ret |= visit_addr (stmt, TREE_OPERAND (TMR_BASE (lhs), 0), data); } if (visit_load) { rhs = get_base_loadstore (rhs); if (rhs) ret |= visit_load (stmt, rhs, data); } } else if (visit_addr && (is_gimple_assign (stmt) || gimple_code (stmt) == GIMPLE_COND)) { for (i = 0; i < gimple_num_ops (stmt); ++i) if (gimple_op (stmt, i) && TREE_CODE (gimple_op (stmt, i)) == ADDR_EXPR) ret |= visit_addr (stmt, TREE_OPERAND (gimple_op (stmt, i), 0), data); } else if (is_gimple_call (stmt)) { if (visit_store) { tree lhs = gimple_call_lhs (stmt); if (lhs) { lhs = get_base_loadstore (lhs); if (lhs) ret |= visit_store (stmt, lhs, data); } } if (visit_load || visit_addr) for (i = 0; i < gimple_call_num_args (stmt); ++i) { tree rhs = gimple_call_arg (stmt, i); if (visit_addr && TREE_CODE (rhs) == ADDR_EXPR) ret |= visit_addr (stmt, TREE_OPERAND (rhs, 0), data); else if (visit_load) { rhs = get_base_loadstore (rhs); if (rhs) ret |= visit_load (stmt, rhs, data); } } if (visit_addr && gimple_call_chain (stmt) && TREE_CODE (gimple_call_chain (stmt)) == ADDR_EXPR) ret |= visit_addr (stmt, TREE_OPERAND (gimple_call_chain (stmt), 0), data); if (visit_addr && gimple_call_return_slot_opt_p (stmt) && gimple_call_lhs (stmt) != NULL_TREE && TREE_ADDRESSABLE (TREE_TYPE (gimple_call_lhs (stmt)))) ret |= visit_addr (stmt, gimple_call_lhs (stmt), data); } else if (gimple_code (stmt) == GIMPLE_ASM) { unsigned noutputs; const char *constraint; const char **oconstraints; bool allows_mem, allows_reg, is_inout; noutputs = gimple_asm_noutputs (stmt); oconstraints = XALLOCAVEC (const char *, noutputs); if (visit_store || visit_addr) for (i = 0; i < gimple_asm_noutputs (stmt); ++i) { tree link = gimple_asm_output_op (stmt, i); tree op = get_base_loadstore (TREE_VALUE (link)); if (op && visit_store) ret |= visit_store (stmt, op, data); if (visit_addr) { constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); oconstraints[i] = constraint; parse_output_constraint (&constraint, i, 0, 0, &allows_mem, &allows_reg, &is_inout); if (op && !allows_reg && allows_mem) ret |= visit_addr (stmt, op, data); } } if (visit_load || visit_addr) for (i = 0; i < gimple_asm_ninputs (stmt); ++i) { tree link = gimple_asm_input_op (stmt, i); tree op = TREE_VALUE (link); if (visit_addr && TREE_CODE (op) == ADDR_EXPR) ret |= visit_addr (stmt, TREE_OPERAND (op, 0), data); else if (visit_load || visit_addr) { op = get_base_loadstore (op); if (op) { if (visit_load) ret |= visit_load (stmt, op, data); if (visit_addr) { constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); parse_input_constraint (&constraint, 0, 0, noutputs, 0, oconstraints, &allows_mem, &allows_reg); if (!allows_reg && allows_mem) ret |= visit_addr (stmt, op, data); } } } } } else if (gimple_code (stmt) == GIMPLE_RETURN) { tree op = gimple_return_retval (stmt); if (op) { if (visit_addr && TREE_CODE (op) == ADDR_EXPR) ret |= visit_addr (stmt, TREE_OPERAND (op, 0), data); else if (visit_load) { op = get_base_loadstore (op); if (op) ret |= visit_load (stmt, op, data); } } } else if (visit_addr && gimple_code (stmt) == GIMPLE_PHI) { for (i = 0; i < gimple_phi_num_args (stmt); ++i) { tree op = PHI_ARG_DEF (stmt, i); if (TREE_CODE (op) == ADDR_EXPR) ret |= visit_addr (stmt, TREE_OPERAND (op, 0), data); } } return ret; } /* Like walk_stmt_load_store_addr_ops but with NULL visit_addr. IPA-CP should make a faster clone for this case. */ bool walk_stmt_load_store_ops (gimple stmt, void *data, bool (*visit_load)(gimple, tree, void *), bool (*visit_store)(gimple, tree, void *)) { return walk_stmt_load_store_addr_ops (stmt, data, visit_load, visit_store, NULL); } /* Helper for gimple_ior_addresses_taken_1. */ static bool gimple_ior_addresses_taken_1 (gimple stmt ATTRIBUTE_UNUSED, tree addr, void *data) { bitmap addresses_taken = (bitmap)data; while (handled_component_p (addr)) addr = TREE_OPERAND (addr, 0); if (DECL_P (addr)) { bitmap_set_bit (addresses_taken, DECL_UID (addr)); return true; } return false; } /* Set the bit for the uid of all decls that have their address taken in STMT in the ADDRESSES_TAKEN bitmap. Returns true if there were any in this stmt. */ bool gimple_ior_addresses_taken (bitmap addresses_taken, gimple stmt) { return walk_stmt_load_store_addr_ops (stmt, addresses_taken, NULL, NULL, gimple_ior_addresses_taken_1); } /* Return a printable name for symbol DECL. */ const char * gimple_decl_printable_name (tree decl, int verbosity) { if (!DECL_NAME (decl)) return NULL; if (DECL_ASSEMBLER_NAME_SET_P (decl)) { const char *str, *mangled_str; int dmgl_opts = DMGL_NO_OPTS; if (verbosity >= 2) { dmgl_opts = DMGL_VERBOSE | DMGL_ANSI | DMGL_GNU_V3 | DMGL_RET_POSTFIX; if (TREE_CODE (decl) == FUNCTION_DECL) dmgl_opts |= DMGL_PARAMS; } mangled_str = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); str = cplus_demangle_v3 (mangled_str, dmgl_opts); return (str) ? str : mangled_str; } return IDENTIFIER_POINTER (DECL_NAME (decl)); } /* Fold a OBJ_TYPE_REF expression to the address of a function. KNOWN_TYPE carries the true type of OBJ_TYPE_REF_OBJECT(REF). Adapted from cp_fold_obj_type_ref, but it tolerates types with no binfo data. */ tree gimple_fold_obj_type_ref (tree ref, tree known_type) { HOST_WIDE_INT index; HOST_WIDE_INT i; tree v; tree fndecl; if (TYPE_BINFO (known_type) == NULL_TREE) return NULL_TREE; v = BINFO_VIRTUALS (TYPE_BINFO (known_type)); index = tree_low_cst (OBJ_TYPE_REF_TOKEN (ref), 1); i = 0; while (i != index) { i += (TARGET_VTABLE_USES_DESCRIPTORS ? TARGET_VTABLE_USES_DESCRIPTORS : 1); v = TREE_CHAIN (v); } fndecl = TREE_VALUE (v); #ifdef ENABLE_CHECKING gcc_assert (tree_int_cst_equal (OBJ_TYPE_REF_TOKEN (ref), DECL_VINDEX (fndecl))); #endif cgraph_node (fndecl)->local.vtable_method = true; return build_fold_addr_expr (fndecl); } #include "gt-gimple.h"
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