can be used. Therefore, GCC attempts to defer popping the arguments until absolutely necessary. (For example, at the end of a conditional, the arguments must be popped, since code outside the conditional won't know whether or not the arguments need to be popped.) When INHIBIT_DEFER_POP is nonzero, however, the compiler does not attempt to defer pops. Instead, the stack is popped immediately after each call. Rather then setting this variable directly, use NO_DEFER_POP and OK_DEFER_POP. */ int x_inhibit_defer_pop; /* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack boundary can be momentarily unaligned while pushing the arguments. Record the delta since last aligned boundary here in order to get stack alignment in the nested function calls working right. */ poly_int64_pod x_stack_pointer_delta; /* Nonzero means __builtin_saveregs has already been done in this function. The value is the pseudoreg containing the value __builtin_saveregs returned. */ rtx x_saveregs_value; /* Similarly for __builtin_apply_args. */ rtx x_apply_args_value; /* List of labels that must never be deleted. */ vec *x_forced_labels; }; typedef struct call_site_record_d *call_site_record; /* RTL representation of exception handling. */ struct GTY(()) rtl_eh { rtx ehr_stackadj; rtx ehr_handler; rtx_code_label *ehr_label; rtx sjlj_fc; rtx_insn *sjlj_exit_after; vec *action_record_data; vec *call_site_record_v[2]; }; #define pending_stack_adjust (crtl->expr.x_pending_stack_adjust) #define inhibit_defer_pop (crtl->expr.x_inhibit_defer_pop) #define saveregs_value (crtl->expr.x_saveregs_value) #define apply_args_value (crtl->expr.x_apply_args_value) #define forced_labels (crtl->expr.x_forced_labels) #define stack_pointer_delta (crtl->expr.x_stack_pointer_delta) struct gimple_df; struct call_site_record_d; struct dw_fde_node; struct GTY(()) varasm_status { /* If we're using a per-function constant pool, this is it. */ struct rtx_constant_pool *pool; /* Number of tree-constants deferred during the expansion of this function. */ unsigned int deferred_constants; }; /* Data for function partitioning. */ struct GTY(()) function_subsections { /* Assembly labels for the hot and cold text sections, to be used by debugger functions for determining the size of text sections. */ const char *hot_section_label; const char *cold_section_label; const char *hot_section_end_label; const char *cold_section_end_label; }; /* Describe an empty area of space in the stack frame. These can be chained into a list; this is used to keep track of space wasted for alignment reasons. */ struct GTY(()) frame_space { struct frame_space *next; poly_int64 start; poly_int64 length; }; struct GTY(()) stack_usage { /* # of bytes of static stack space allocated by the function. */ HOST_WIDE_INT static_stack_size; /* # of bytes of dynamic stack space allocated by the function. This is meaningful only if has_unbounded_dynamic_stack_size is zero. */ HOST_WIDE_INT dynamic_stack_size; /* Upper bound on the number of bytes pushed onto the stack after the prologue. If !ACCUMULATE_OUTGOING_ARGS, it contains the outgoing arguments. */ poly_int64 pushed_stack_size; /* Nonzero if the amount of stack space allocated dynamically cannot be bounded at compile-time. */ unsigned int has_unbounded_dynamic_stack_size : 1; }; #define current_function_static_stack_size (cfun->su->static_stack_size) #define current_function_dynamic_stack_size (cfun->su->dynamic_stack_size) #define current_function_pushed_stack_size (cfun->su->pushed_stack_size) #define current_function_has_unbounded_dynamic_stack_size \ (cfun->su->has_unbounded_dynamic_stack_size) #define current_function_allocates_dynamic_stack_space \ (current_function_dynamic_stack_size != 0 \ || current_function_has_unbounded_dynamic_stack_size) /* This structure can save all the important global and static variables describing the status of the current function. */ struct GTY(()) function { struct eh_status *eh; /* The control flow graph for this function. */ struct control_flow_graph *cfg; /* GIMPLE body for this function. */ gimple_seq gimple_body; /* SSA and dataflow information. */ struct gimple_df *gimple_df; /* The loops in this function. */ struct loops *x_current_loops; /* Filled by the GIMPLE and RTL FEs, pass to start compilation with. */ char *pass_startwith; /* The stack usage of this function. */ struct stack_usage *su; /* Value histograms attached to particular statements. */ htab_t GTY((skip)) value_histograms; /* For function.c. */ /* Points to the FUNCTION_DECL of this function. */ tree decl; /* A PARM_DECL that should contain the static chain for this function. It will be initialized at the beginning of the function. */ tree static_chain_decl; /* An expression that contains the non-local goto save area. The first word is the saved frame pointer and the second is the saved stack pointer. */ tree nonlocal_goto_save_area; /* Vector of function local variables, functions, types and constants. */ vec *local_decls; /* For md files. */ /* tm.h can use this to store whatever it likes. */ struct machine_function * GTY ((maybe_undef)) machine; /* Language-specific code can use this to store whatever it likes. */ struct language_function * language; /* Used types hash table. */ hash_set *GTY (()) used_types_hash; /* Dwarf2 Frame Description Entry, containing the Call Frame Instructions used for unwinding. Only set when either dwarf2 unwinding or dwarf2 debugging is enabled. */ struct dw_fde_node *fde; /* Last statement uid. */ int last_stmt_uid; /* Debug marker counter. Count begin stmt markers. We don't have to keep it exact, it's more of a rough estimate to enable us to decide whether they are too many to copy during inlining, or when expanding to RTL. */ int debug_marker_count; /* Function sequence number for profiling, debugging, etc. */ int funcdef_no; /* Line number of the start of the function for debugging purposes. */ location_t function_start_locus; /* Line number of the end of the function. */ location_t function_end_locus; /* Properties used by the pass manager. */ unsigned int curr_properties; unsigned int last_verified; /* Non-null if the function does something that would prevent it from being copied; this applies to both versioning and inlining. Set to a string describing the reason for failure. */ const char * GTY((skip)) cannot_be_copied_reason; /* Last assigned dependence info clique. */ unsigned short last_clique; /* Collected bit flags. */ /* Number of units of general registers that need saving in stdarg function. What unit is depends on the backend, either it is number of bytes, or it can be number of registers. */ unsigned int va_list_gpr_size : 8; /* Number of units of floating point registers that need saving in stdarg function. */ unsigned int va_list_fpr_size : 8; /* Nonzero if function being compiled can call setjmp. */ unsigned int calls_setjmp : 1; /* Nonzero if function being compiled can call alloca, either as a subroutine or builtin. */ unsigned int calls_alloca : 1; /* Nonzero if function being compiled receives nonlocal gotos from nested functions. */ unsigned int has_nonlocal_label : 1; /* Nonzero if function being compiled has a forced label placed into static storage. */ unsigned int has_forced_label_in_static : 1; /* Nonzero if we've set cannot_be_copied_reason. I.e. if (cannot_be_copied_set && !cannot_be_copied_reason), the function can in fact be copied. */ unsigned int cannot_be_copied_set : 1; /* Nonzero if current function uses stdarg.h or equivalent. */ unsigned int stdarg : 1; unsigned int after_inlining : 1; unsigned int always_inline_functions_inlined : 1; /* Nonzero if function being compiled can throw synchronous non-call exceptions. */ unsigned int can_throw_non_call_exceptions : 1; /* Nonzero if instructions that may throw exceptions but don't otherwise contribute to the execution of the program can be deleted. */ unsigned int can_delete_dead_exceptions : 1; /* Fields below this point are not set for abstract functions; see allocate_struct_function. */ /* Nonzero if function being compiled needs to be given an address where the value should be stored. */ unsigned int returns_struct : 1; /* Nonzero if function being compiled needs to return the address of where it has put a structure value. */ unsigned int returns_pcc_struct : 1; /* Nonzero if this function has local DECL_HARD_REGISTER variables. In this case code motion has to be done more carefully. */ unsigned int has_local_explicit_reg_vars : 1; /* Nonzero if the current function is a thunk, i.e., a lightweight function implemented by the output_mi_thunk hook) that just adjusts one of its arguments and forwards to another function. */ unsigned int is_thunk : 1; /* Nonzero if the current function contains any loops with loop->force_vectorize set. */ unsigned int has_force_vectorize_loops : 1; /* Nonzero if the current function contains any loops with nonzero value in loop->simduid. */ unsigned int has_simduid_loops : 1; /* Nonzero when the tail call has been identified. */ unsigned int tail_call_marked : 1; /* Nonzero if the current function contains a #pragma GCC unroll. */ unsigned int has_unroll : 1; /* Set when the function was compiled with generation of debug (begin stmt, inline entry, ...) markers enabled. */ unsigned int debug_nonbind_markers : 1; }; /* Add the decl D to the local_decls list of FUN. */ void add_local_decl (struct function *fun, tree d); #define FOR_EACH_LOCAL_DECL(FUN, I, D) \ FOR_EACH_VEC_SAFE_ELT_REVERSE ((FUN)->local_decls, I, D) /* If va_list_[gf]pr_size is set to this, it means we don't know how many units need to be saved. */ #define VA_LIST_MAX_GPR_SIZE 255 #define VA_LIST_MAX_FPR_SIZE 255 /* The function currently being compiled. */ extern GTY(()) struct function *cfun; /* In order to ensure that cfun is not set directly, we redefine it so that it is not an lvalue. Rather than assign to cfun, use push_cfun or set_cfun. */ #define cfun (cfun + 0) /* Nonzero if we've already converted virtual regs to hard regs. */ extern int virtuals_instantiated; /* Nonzero if at least one trampoline has been created. */ extern int trampolines_created; struct GTY((for_user)) types_used_by_vars_entry { tree type; tree var_decl; }; struct used_type_hasher : ggc_ptr_hash { static hashval_t hash (types_used_by_vars_entry *); static bool equal (types_used_by_vars_entry *, types_used_by_vars_entry *); }; /* Hash table making the relationship between a global variable and the types it references in its initializer. The key of the entry is a referenced type, and the value is the DECL of the global variable. types_use_by_vars_do_hash and types_used_by_vars_eq below are the hash and equality functions to use for this hash table. */ extern GTY(()) hash_table *types_used_by_vars_hash; void types_used_by_var_decl_insert (tree type, tree var_decl); /* During parsing of a global variable, this vector contains the types referenced by the global variable. */ extern GTY(()) vec *types_used_by_cur_var_decl; /* Return the loop tree of FN. */ inline struct loops * loops_for_fn (struct function *fn) { return fn->x_current_loops; } /* Set the loop tree of FN to LOOPS. */ inline void set_loops_for_fn (struct function *fn, struct loops *loops) { gcc_checking_assert (fn->x_current_loops == NULL || loops == NULL); fn->x_current_loops = loops; } /* For backward compatibility... eventually these should all go away. */ #define current_function_funcdef_no (cfun->funcdef_no) #define current_loops (cfun->x_current_loops) #define dom_computed (cfun->cfg->x_dom_computed) #define n_bbs_in_dom_tree (cfun->cfg->x_n_bbs_in_dom_tree) #define VALUE_HISTOGRAMS(fun) (fun)->value_histograms /* A pointer to a function to create target specific, per-function data structures. */ extern struct machine_function * (*init_machine_status) (void); /* Structure to record the size of a sequence of arguments as the sum of a tree-expression and a constant. This structure is also used to store offsets from the stack, which might be negative, so the variable part must be ssizetype, not sizetype. */ struct args_size { poly_int64_pod constant; tree var; }; /* Package up various arg related fields of struct args for locate_and_pad_parm. */ struct locate_and_pad_arg_data { /* Size of this argument on the stack, rounded up for any padding it gets. If REG_PARM_STACK_SPACE is defined, then register parms are counted here, otherwise they aren't. */ struct args_size size; /* Offset of this argument from beginning of stack-args. */ struct args_size offset; /* Offset to the start of the stack slot. Different from OFFSET if this arg pads downward. */ struct args_size slot_offset; /* The amount that the stack pointer needs to be adjusted to force alignment for the next argument. */ struct args_size alignment_pad; /* Which way we should pad this arg. */ pad_direction where_pad; /* slot_offset is at least this aligned. */ unsigned int boundary; }; /* Add the value of the tree INC to the `struct args_size' TO. */ #define ADD_PARM_SIZE(TO, INC) \ do { \ tree inc = (INC); \ if (tree_fits_shwi_p (inc)) \ (TO).constant += tree_to_shwi (inc); \ else if ((TO).var == 0) \ (TO).var = fold_convert (ssizetype, inc); \ else \ (TO).var = size_binop (PLUS_EXPR, (TO).var, \ fold_convert (ssizetype, inc)); \ } while (0) #define SUB_PARM_SIZE(TO, DEC) \ do { \ tree dec = (DEC); \ if (tree_fits_shwi_p (dec)) \ (TO).constant -= tree_to_shwi (dec); \ else if ((TO).var == 0) \ (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \ fold_convert (ssizetype, dec)); \ else \ (TO).var = size_binop (MINUS_EXPR, (TO).var, \ fold_convert (ssizetype, dec)); \ } while (0) /* Convert the implicit sum in a `struct args_size' into a tree of type ssizetype. */ #define ARGS_SIZE_TREE(SIZE) \ ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \ : size_binop (PLUS_EXPR, fold_convert (ssizetype, (SIZE).var), \ ssize_int ((SIZE).constant))) /* Convert the implicit sum in a `struct args_size' into an rtx. */ #define ARGS_SIZE_RTX(SIZE) \ ((SIZE).var == 0 ? gen_int_mode ((SIZE).constant, Pmode) \ : expand_normal (ARGS_SIZE_TREE (SIZE))) #define ASLK_REDUCE_ALIGN 1 #define ASLK_RECORD_PAD 2 /* If pointers to member functions use the least significant bit to indicate whether a function is virtual, ensure a pointer to this function will have that bit clear. */ #define MINIMUM_METHOD_BOUNDARY \ ((TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn) \ ? MAX (FUNCTION_BOUNDARY, 2 * BITS_PER_UNIT) : FUNCTION_BOUNDARY) enum stack_clash_probes { NO_PROBE_NO_FRAME, NO_PROBE_SMALL_FRAME, PROBE_INLINE, PROBE_LOOP }; extern void dump_stack_clash_frame_info (enum stack_clash_probes, bool);