/* Header for code translation functions Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. Contributed by Paul Brook This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef GFC_TRANS_H #define GFC_TRANS_H /* Mangled symbols take the form __module__name. */ #define GFC_MAX_MANGLED_SYMBOL_LEN (GFC_MAX_SYMBOL_LEN*2+4) /* Struct for holding a block of statements. It should be treated as an opaque entity and not modified directly. This allows us to change the underlying representation of statement lists. */ typedef struct { tree head; unsigned int has_scope:1; } stmtblock_t; /* a simplified expression */ typedef struct gfc_se { /* Code blocks to be executed before and after using the value. */ stmtblock_t pre; stmtblock_t post; /* the result of the expression */ tree expr; /* The length of a character string value. */ tree string_length; /* If set gfc_conv_variable will return an expression for the array descriptor. When set, want_pointer should also be set. If not set scalarizing variables will be substituted. */ unsigned descriptor_only:1; /* When this is set gfc_conv_expr returns the address of a variable. Only applies to EXPR_VARIABLE nodes. Also used by gfc_conv_array_parameter. When set this indicates a pointer to the descriptor should be returned, rather than the descriptor itself. */ unsigned want_pointer:1; /* An array function call returning without a temporary. Also used for array pointer assignments. */ unsigned direct_byref:1; /* Ignore absent optional arguments. Used for some intrinsics. */ unsigned ignore_optional:1; /* Scalarization parameters. */ struct gfc_se *parent; struct gfc_ss *ss; struct gfc_loopinfo *loop; } gfc_se; /* Scalarisation State chain. Created by walking an expression tree before creating the scalarization loops. Then passed as part of a gfc_se structure to translate the expression inside the loop. Note that these chains are terminated by gfc_se_terminator, not NULL. A NULL pointer in a gfc_se indicates to gfc_conv_* that this is a scalar expression. Note that some member arrays correspond to scalarizer rank and others are the variable rank. */ typedef struct gfc_ss_info { int dimen; /* The ref that holds information on this section. */ gfc_ref *ref; /* The descriptor of this array. */ tree descriptor; /* holds the pointer to the data array. */ tree data; /* To move some of the array index calculation out of the innermost loop. */ tree offset; tree saved_offset; tree stride0; /* Holds the SS for a subscript. Indexed by actual dimension. */ struct gfc_ss *subscript[GFC_MAX_DIMENSIONS]; /* stride and delta are used to access this inside a scalarization loop. start is used in the calculation of these. Indexed by scalarizer dimension. */ tree start[GFC_MAX_DIMENSIONS]; tree stride[GFC_MAX_DIMENSIONS]; tree delta[GFC_MAX_DIMENSIONS]; /* Translation from scalariser dimensions to actual dimensions. actual = dim[scalarizer] */ int dim[GFC_MAX_DIMENSIONS]; } gfc_ss_info; typedef enum { /* A scalar value. This will be evaluated before entering the scalarization loop. */ GFC_SS_SCALAR, /* Like GFC_SS_SCALAR except it evaluates a pointer the the expression. Used for elemental function parameters. */ GFC_SS_REFERENCE, /* An array section. Scalarization indices will be substituted during expression translation. */ GFC_SS_SECTION, /* A non-elemental function call returning an array. The call is executed before entering the scalarization loop, storing the result in a temporary. This temporary is then used inside the scalarization loop. Simple assignments, eg. a(:) = fn() are handles without a temporary as a special case. */ GFC_SS_FUNCTION, /* An array constructor. The current implementation is sub-optimal in many cases. It allocated a temporary, assigns the values to it, then uses this temporary inside the scalarization loop. */ GFC_SS_CONSTRUCTOR, /* A vector subscript. Only used as the SS chain for a subscript. Similar int format to a GFC_SS_SECTION. */ GFC_SS_VECTOR, /* A temporary array allocated by the scalarizer. Its rank can be less than that of the assignment expression. */ GFC_SS_TEMP, /* An intrinsic function call. Many intrinsic functions which map directly to library calls are created as GFC_SS_FUNCTION nodes. */ GFC_SS_INTRINSIC, /* A component of a derived type. */ GFC_SS_COMPONENT } gfc_ss_type; /* SS structures can only belong to a single loopinfo. They must be added otherwise they will not get freed. */ typedef struct gfc_ss { gfc_ss_type type; gfc_expr *expr; mpz_t *shape; tree string_length; union { /* If type is GFC_SS_SCALAR or GFC_SS_REFERENCE. */ struct { tree expr; } scalar; /* GFC_SS_TEMP. */ struct { /* The rank of the temporary. May be less than the rank of the assigned expression. */ int dimen; tree type; } temp; /* All other types. */ gfc_ss_info info; } data; /* All the SS in a loop and linked through loop_chain. The SS for an expression are linked by the next pointer. */ struct gfc_ss *loop_chain; struct gfc_ss *next; /* This is used by assignments requiring teporaries. The bits specify which loops the terms appear in. This will be 1 for the RHS expressions, 2 for the LHS expressions, and 3(=1|2) for the temporary. */ unsigned useflags:2; } gfc_ss; #define gfc_get_ss() gfc_getmem(sizeof(gfc_ss)) /* The contents of this aren't actually used. A NULL SS chain indicates a scalar expression, so this pointer is used to terminate SS chains. */ extern gfc_ss * const gfc_ss_terminator; /* Holds information about an expression while it is being scalarized. */ typedef struct gfc_loopinfo { stmtblock_t pre; stmtblock_t post; int dimen; /* All the SS involved with this loop. */ gfc_ss *ss; /* The SS describing the teporary used in an assignment. */ gfc_ss *temp_ss; /* The scalarization loop index variables. */ tree loopvar[GFC_MAX_DIMENSIONS]; /* The bounds of the scalarization loops. */ tree from[GFC_MAX_DIMENSIONS]; tree to[GFC_MAX_DIMENSIONS]; gfc_ss *specloop[GFC_MAX_DIMENSIONS]; /* The code member contains the code for the body of the next outer loop. */ stmtblock_t code[GFC_MAX_DIMENSIONS]; /* Order in which the dimensions should be looped, innermost first. */ int order[GFC_MAX_DIMENSIONS]; /* The number of dimensions for which a temporary is used. */ int temp_dim; /* If set we don't need the loop variables. */ unsigned array_parameter:1; } gfc_loopinfo; /* Information about a symbol that has been shadowed by a temporary. */ typedef struct { symbol_attribute attr; tree decl; } gfc_saved_var; /* Advance the SS chain to the next term. */ void gfc_advance_se_ss_chain (gfc_se *); /* Call this to initialise a gfc_se structure before use first parameter is structure to initialise, second is parent to get scalarization data from, or NULL. */ void gfc_init_se (gfc_se *, gfc_se *); /* Create an artificial variable decl and add it to the current scope. */ tree gfc_create_var (tree, const char *); /* Like above but doesn't add it to the current scope. */ tree gfc_create_var_np (tree, const char *); /* Store the result of an expression in a temp variable so it can be used repeatedly even if the original changes */ void gfc_make_safe_expr (gfc_se * se); /* Makes sure se is suitable for passing as a function string parameter. */ void gfc_conv_string_parameter (gfc_se * se); /* Add an item to the end of TREE_LIST. */ tree gfc_chainon_list (tree, tree); /* When using the gfc_conv_* make sure you understand what they do, i.e. when a POST chain may be created, and what the retured expression may be used for. Note that character strings have special handling. This should not be a problem as most statements/operations only deal with numeric/logical types. */ /* Entry point for expression translation. */ void gfc_conv_expr (gfc_se * se, gfc_expr * expr); /* Like gfc_conv_expr, but the POST block is guaranteed to be empty for numeric expressions. */ void gfc_conv_expr_val (gfc_se * se, gfc_expr * expr); /* Like gfc_conv_expr_val, but the value is also suitable for use in the lhs of an assignment. */ void gfc_conv_expr_lhs (gfc_se * se, gfc_expr * expr); /* Converts an expression so that it can be passed be reference. */ void gfc_conv_expr_reference (gfc_se * se, gfc_expr *); /* Equivalent to convert(type, gfc_conv_expr_val(se, expr)). */ void gfc_conv_expr_type (gfc_se * se, gfc_expr *, tree); /* If the value is not constant, Create a temporary and copy the value. */ tree gfc_evaluate_now (tree, stmtblock_t *); /* Intrinsic function handling. */ void gfc_conv_intrinsic_function (gfc_se *, gfc_expr *); /* Does an intrinsic map directly to an external library call. */ int gfc_is_intrinsic_libcall (gfc_expr *); /* Also used to CALL subroutines. */ void gfc_conv_function_call (gfc_se *, gfc_symbol *, gfc_actual_arglist *); /* gfc_trans_* shouldn't call push/poplevel, use gfc_push/pop_scope */ /* Generate code for a scalar assignment. */ tree gfc_trans_scalar_assign (gfc_se *, gfc_se *, bt); /* Translate COMMON blocks. */ void gfc_trans_common (gfc_namespace *); /* Translate a derived type constructor. */ void gfc_conv_structure (gfc_se *, gfc_expr *, int); /* Return an expression which determines if a dummy parameter is present. */ tree gfc_conv_expr_present (gfc_symbol *); /* Generate code to allocate a string temporary. */ tree gfc_conv_string_tmp (gfc_se *, tree, tree); /* Get the string length variable belonging to an expression. */ tree gfc_get_expr_charlen (gfc_expr *); /* Initialize a string length variable. */ void gfc_trans_init_string_length (gfc_charlen *, stmtblock_t *); /* Add an expression to the end of a block. */ void gfc_add_expr_to_block (stmtblock_t *, tree); /* Add a block to the end of a block. */ void gfc_add_block_to_block (stmtblock_t *, stmtblock_t *); /* Add a MODIFY_EXPR to a block. */ void gfc_add_modify_expr (stmtblock_t *, tree, tree); /* Initialize a statement block. */ void gfc_init_block (stmtblock_t *); /* Start a new satement block. Like gfc_init_block but also starts a new variable scope. */ void gfc_start_block (stmtblock_t *); /* Finish a statement block. Also closes the scope if the block was created with gfc_start_block. */ tree gfc_finish_block (stmtblock_t *); /* Merge the scope of a block with its parent. */ void gfc_merge_block_scope (stmtblock_t * block); /* Return the backend label decl. */ tree gfc_get_label_decl (gfc_st_label *); /* Return the decl for an external function. */ tree gfc_get_extern_function_decl (gfc_symbol *); /* Return the decl for a function. */ tree gfc_get_function_decl (gfc_symbol *); /* Build a CALL_EXPR. */ tree gfc_build_function_call (tree, tree); /* Build an ADDR_EXPR. */ tree gfc_build_addr_expr (tree, tree); /* Build an INDIRECT_REF. */ tree gfc_build_indirect_ref (tree); /* Build an ARRAY_REF. */ tree gfc_build_array_ref (tree, tree); /* Creates an label. Decl is artificial if label_id == NULL_TREE. */ tree gfc_build_label_decl (tree); /* Return the decl used to hold the function return value. Do not use if the function has an explicit result variable. */ tree gfc_get_fake_result_decl (gfc_symbol *); /* Get the return label for the current function. */ tree gfc_get_return_label (void); /* Add a decl to the binding level for the current function. */ void gfc_add_decl_to_function (tree); /* Make prototypes for runtime library functions. */ void gfc_build_builtin_function_decls (void); /* Set the backend source location of a decl. */ void gfc_set_decl_location (tree, locus *); /* Return the variable decl for a symbol. */ tree gfc_get_symbol_decl (gfc_symbol *); /* Build a static initializer. */ tree gfc_conv_initializer (gfc_expr *, gfc_typespec *, tree, bool, bool); /* Substitute a temporary variable in place of the real one. */ void gfc_shadow_sym (gfc_symbol *, tree, gfc_saved_var *); /* Restore the original variable. */ void gfc_restore_sym (gfc_symbol *, gfc_saved_var *); /* Allocate the lang-spcific part of a decl node. */ void gfc_allocate_lang_decl (tree); /* Advance along a TREE_CHAIN. */ tree gfc_advance_chain (tree, int); /* Create a decl for a function. */ void gfc_create_function_decl (gfc_namespace *); /* Generate the code for a function. */ void gfc_generate_function_code (gfc_namespace *); /* Output a BLOCK DATA program unit. */ void gfc_generate_block_data (gfc_namespace *); /* Output a decl for a module variable. */ void gfc_generate_module_vars (gfc_namespace *); /* Get and set the current location. */ void gfc_set_backend_locus (locus *); void gfc_get_backend_locus (locus *); /* Handle static constructor functions. */ extern GTY(()) tree gfc_static_ctors; void gfc_generate_constructors (void); /* Generate a runtime error check. */ void gfc_trans_runtime_check (tree, tree, stmtblock_t *); /* Generate code for an assignment, includes scalarization. */ tree gfc_trans_assignment (gfc_expr *, gfc_expr *); /* Generate code for an pointer assignment. */ tree gfc_trans_pointer_assignment (gfc_expr *, gfc_expr *); /* Initialize function decls for library functions. */ void gfc_build_intrinsic_lib_fndecls (void); /* Create function decls for IO library functions. */ void gfc_build_io_library_fndecls (void); /* Build a function decl for a library function. */ tree gfc_build_library_function_decl (tree, tree, int, ...); /* somewhere! */ tree pushdecl (tree); tree pushdecl_top_level (tree); void pushlevel (int); tree poplevel (int, int, int); tree getdecls (void); tree gfc_truthvalue_conversion (tree); tree builtin_function (const char *, tree, int, enum built_in_class, const char *, tree); /* Runtime library function decls. */ extern GTY(()) tree gfor_fndecl_internal_malloc; extern GTY(()) tree gfor_fndecl_internal_malloc64; extern GTY(()) tree gfor_fndecl_internal_free; extern GTY(()) tree gfor_fndecl_allocate; extern GTY(()) tree gfor_fndecl_allocate64; extern GTY(()) tree gfor_fndecl_deallocate; extern GTY(()) tree gfor_fndecl_pause_numeric; extern GTY(()) tree gfor_fndecl_pause_string; extern GTY(()) tree gfor_fndecl_stop_numeric; extern GTY(()) tree gfor_fndecl_stop_string; extern GTY(()) tree gfor_fndecl_select_string; extern GTY(()) tree gfor_fndecl_runtime_error; extern GTY(()) tree gfor_fndecl_in_pack; extern GTY(()) tree gfor_fndecl_in_unpack; extern GTY(()) tree gfor_fndecl_associated; /* Math functions. Many other math functions are handled in trans-intrinsic.c. */ typedef struct gfc_powdecl_list GTY(()) { tree integer; tree real; tree cmplx; } gfc_powdecl_list; extern GTY(()) gfc_powdecl_list gfor_fndecl_math_powi[3][2]; extern GTY(()) tree gfor_fndecl_math_cpowf; extern GTY(()) tree gfor_fndecl_math_cpow; extern GTY(()) tree gfor_fndecl_math_ishftc4; extern GTY(()) tree gfor_fndecl_math_ishftc8; extern GTY(()) tree gfor_fndecl_math_exponent4; extern GTY(()) tree gfor_fndecl_math_exponent8; /* String functions. */ extern GTY(()) tree gfor_fndecl_copy_string; extern GTY(()) tree gfor_fndecl_compare_string; extern GTY(()) tree gfor_fndecl_concat_string; extern GTY(()) tree gfor_fndecl_string_len_trim; extern GTY(()) tree gfor_fndecl_string_index; extern GTY(()) tree gfor_fndecl_string_scan; extern GTY(()) tree gfor_fndecl_string_verify; extern GTY(()) tree gfor_fndecl_string_trim; extern GTY(()) tree gfor_fndecl_string_repeat; extern GTY(()) tree gfor_fndecl_adjustl; extern GTY(()) tree gfor_fndecl_adjustr; /* Other misc. runtime library functions. */ extern GTY(()) tree gfor_fndecl_size0; extern GTY(()) tree gfor_fndecl_size1; extern GTY(()) tree gfor_fndecl_iargc; /* Implemented in FORTRAN. */ extern GTY(()) tree gfor_fndecl_si_kind; extern GTY(()) tree gfor_fndecl_sr_kind; /* True if node is an integer constant. */ #define INTEGER_CST_P(node) (TREE_CODE(node) == INTEGER_CST) /* G95-specific declaration information. */ /* Array types only. */ struct lang_type GTY(()) { int rank; tree lbound[GFC_MAX_DIMENSIONS]; tree ubound[GFC_MAX_DIMENSIONS]; tree stride[GFC_MAX_DIMENSIONS]; tree size; tree offset; tree dtype; tree dataptr_type; }; struct lang_decl GTY(()) { /* Dummy variables. */ tree saved_descriptor; /* Assigned integer nodes. Stringlength is the IO format string's length. Addr is the address of the string or the target label. Stringlength is initialized to -2 and assigned to -1 when addr is assigned to the address of target label. */ tree stringlen; tree addr; }; #define GFC_DECL_ASSIGN_ADDR(node) DECL_LANG_SPECIFIC(node)->addr #define GFC_DECL_STRING_LEN(node) DECL_LANG_SPECIFIC(node)->stringlen #define GFC_DECL_SAVED_DESCRIPTOR(node) \ (DECL_LANG_SPECIFIC(node)->saved_descriptor) #define GFC_DECL_PACKED_ARRAY(node) DECL_LANG_FLAG_0(node) #define GFC_DECL_PARTIAL_PACKED_ARRAY(node) DECL_LANG_FLAG_1(node) #define GFC_DECL_ASSIGN(node) DECL_LANG_FLAG_2(node) /* An array descriptor. */ #define GFC_DESCRIPTOR_TYPE_P(node) TYPE_LANG_FLAG_1(node) /* An array without a descriptor. */ #define GFC_ARRAY_TYPE_P(node) TYPE_LANG_FLAG_2(node) /* The GFC_TYPE_ARRAY_* members are present in both descriptor and descriptorless array types. */ #define GFC_TYPE_ARRAY_LBOUND(node, dim) \ (TYPE_LANG_SPECIFIC(node)->lbound[dim]) #define GFC_TYPE_ARRAY_UBOUND(node, dim) \ (TYPE_LANG_SPECIFIC(node)->ubound[dim]) #define GFC_TYPE_ARRAY_STRIDE(node, dim) \ (TYPE_LANG_SPECIFIC(node)->stride[dim]) #define GFC_TYPE_ARRAY_RANK(node) (TYPE_LANG_SPECIFIC(node)->rank) #define GFC_TYPE_ARRAY_SIZE(node) (TYPE_LANG_SPECIFIC(node)->size) #define GFC_TYPE_ARRAY_OFFSET(node) (TYPE_LANG_SPECIFIC(node)->offset) /* Code should use gfc_get_dtype instead of accesig this directly. It may not be known when the type is created. */ #define GFC_TYPE_ARRAY_DTYPE(node) (TYPE_LANG_SPECIFIC(node)->dtype) #define GFC_TYPE_ARRAY_DATAPTR_TYPE(node) \ (TYPE_LANG_SPECIFIC(node)->dataptr_type) /* I changed this from sorry(...) because it should not return. */ /* TODO: Remove gfc_todo_error before releasing version 1.0. */ #define gfc_todo_error(args...) fatal_error("gfc_todo: Not Implemented: " args) /* Build an expression with void type. */ #define build1_v(code, arg) build(code, void_type_node, arg) #define build2_v(code, arg1, arg2) build2(code, void_type_node, \ arg1, arg2) #define build3_v(code, arg1, arg2, arg3) build3(code, void_type_node, \ arg1, arg2, arg3) /* flag for alternative return labels. */ extern int has_alternate_specifier; /* for caller */ #endif /* GFC_TRANS_H */