| /* Routines for GCC for ARM/pe. |
| Copyright (C) 1995, 1996, 2000 Free Software Foundation, Inc. |
| Contributed by Doug Evans (dje@cygnus.com). |
| |
| This file is part of GNU CC. |
| |
| GNU CC 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. |
| |
| GNU CC 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 GNU CC; see the file COPYING. If not, write to |
| the Free Software Foundation, 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "rtl.h" |
| #include "output.h" |
| #include "flags.h" |
| #include "tree.h" |
| #include "expr.h" |
| #include "toplev.h" |
| #include "tm_p.h" |
| |
| extern int current_function_anonymous_args; |
| |
| /* ARM/PE specific attribute support. |
| |
| ARM/PE has three new attributes: |
| naked - for interrupt functions |
| dllexport - for exporting a function/variable that will live in a dll |
| dllimport - for importing a function/variable from a dll |
| |
| Microsoft allows multiple declspecs in one __declspec, separating |
| them with spaces. We do NOT support this. Instead, use __declspec |
| multiple times. |
| */ |
| |
| /* Return nonzero if ATTR is a valid attribute for DECL. |
| ATTRIBUTES are any existing attributes and ARGS are the arguments |
| supplied with ATTR. */ |
| |
| int |
| arm_pe_valid_machine_decl_attribute (decl, attributes, attr, args) |
| tree decl; |
| tree attributes ATTRIBUTE_UNUSED; |
| tree attr; |
| tree args; |
| { |
| if (args != NULL_TREE) |
| return 0; |
| |
| if (is_attribute_p ("dllexport", attr)) |
| return 1; |
| |
| if (is_attribute_p ("dllimport", attr)) |
| return 1; |
| |
| return arm_valid_machine_decl_attribute (decl, attr, args); |
| } |
| |
| /* Merge attributes in decls OLD and NEW. |
| |
| This handles the following situation: |
| |
| __declspec (dllimport) int foo; |
| int foo; |
| |
| The second instance of `foo' nullifies the dllimport. */ |
| |
| tree |
| arm_pe_merge_machine_decl_attributes (old, new) |
| tree old, new; |
| { |
| tree a; |
| int delete_dllimport_p; |
| |
| old = DECL_MACHINE_ATTRIBUTES (old); |
| new = DECL_MACHINE_ATTRIBUTES (new); |
| |
| /* What we need to do here is remove from `old' dllimport if it doesn't |
| appear in `new'. dllimport behaves like extern: if a declaration is |
| marked dllimport and a definition appears later, then the object |
| is not dllimport'd. */ |
| |
| if (lookup_attribute ("dllimport", old) != NULL_TREE |
| && lookup_attribute ("dllimport", new) == NULL_TREE) |
| delete_dllimport_p = 1; |
| else |
| delete_dllimport_p = 0; |
| |
| a = merge_attributes (old, new); |
| |
| if (delete_dllimport_p) |
| { |
| tree prev,t; |
| |
| /* Scan the list for dllimport and delete it. */ |
| for (prev = NULL_TREE, t = a; t; prev = t, t = TREE_CHAIN (t)) |
| { |
| if (is_attribute_p ("dllimport", TREE_PURPOSE (t))) |
| { |
| if (prev == NULL_TREE) |
| a = TREE_CHAIN (a); |
| else |
| TREE_CHAIN (prev) = TREE_CHAIN (t); |
| break; |
| } |
| } |
| } |
| |
| return a; |
| } |
| |
| /* Return non-zero if DECL is a dllexport'd object. */ |
| |
| tree current_class_type; /* FIXME */ |
| |
| int |
| arm_dllexport_p (decl) |
| tree decl; |
| { |
| tree exp; |
| |
| if (TREE_CODE (decl) != VAR_DECL |
| && TREE_CODE (decl) != FUNCTION_DECL) |
| return 0; |
| exp = lookup_attribute ("dllexport", DECL_MACHINE_ATTRIBUTES (decl)); |
| if (exp) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* Return non-zero if DECL is a dllimport'd object. */ |
| |
| int |
| arm_dllimport_p (decl) |
| tree decl; |
| { |
| tree imp; |
| |
| if (TREE_CODE (decl) == FUNCTION_DECL |
| && TARGET_NOP_FUN_DLLIMPORT) |
| return 0; |
| |
| if (TREE_CODE (decl) != VAR_DECL |
| && TREE_CODE (decl) != FUNCTION_DECL) |
| return 0; |
| imp = lookup_attribute ("dllimport", DECL_MACHINE_ATTRIBUTES (decl)); |
| if (imp) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* Return non-zero if SYMBOL is marked as being dllexport'd. */ |
| |
| int |
| arm_dllexport_name_p (symbol) |
| const char * symbol; |
| { |
| return symbol[0] == ARM_PE_FLAG_CHAR && symbol[1] == 'e' && symbol[2] == '.'; |
| } |
| |
| /* Return non-zero if SYMBOL is marked as being dllimport'd. */ |
| |
| int |
| arm_dllimport_name_p (symbol) |
| const char * symbol; |
| { |
| return symbol[0] == ARM_PE_FLAG_CHAR && symbol[1] == 'i' && symbol[2] == '.'; |
| } |
| |
| /* Mark a DECL as being dllexport'd. |
| Note that we override the previous setting (eg: dllimport). */ |
| |
| void |
| arm_mark_dllexport (decl) |
| tree decl; |
| { |
| const char * oldname; |
| char * newname; |
| rtx rtlname; |
| tree idp; |
| |
| rtlname = XEXP (DECL_RTL (decl), 0); |
| if (GET_CODE (rtlname) == SYMBOL_REF) |
| oldname = XSTR (rtlname, 0); |
| else if (GET_CODE (rtlname) == MEM |
| && GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF) |
| oldname = XSTR (XEXP (rtlname, 0), 0); |
| else |
| abort (); |
| if (arm_dllimport_name_p (oldname)) |
| oldname += 9; |
| else if (arm_dllexport_name_p (oldname)) |
| return; /* already done */ |
| |
| newname = alloca (strlen (oldname) + 4); |
| sprintf (newname, "%ce.%s", ARM_PE_FLAG_CHAR, oldname); |
| |
| /* We pass newname through get_identifier to ensure it has a unique |
| address. RTL processing can sometimes peek inside the symbol ref |
| and compare the string's addresses to see if two symbols are |
| identical. */ |
| /* ??? At least I think that's why we do this. */ |
| idp = get_identifier (newname); |
| |
| XEXP (DECL_RTL (decl), 0) = |
| gen_rtx (SYMBOL_REF, Pmode, IDENTIFIER_POINTER (idp)); |
| } |
| |
| /* Mark a DECL as being dllimport'd. */ |
| |
| void |
| arm_mark_dllimport (decl) |
| tree decl; |
| { |
| const char * oldname; |
| char * newname; |
| tree idp; |
| rtx rtlname, newrtl; |
| |
| rtlname = XEXP (DECL_RTL (decl), 0); |
| |
| if (GET_CODE (rtlname) == SYMBOL_REF) |
| oldname = XSTR (rtlname, 0); |
| else if (GET_CODE (rtlname) == MEM |
| && GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF) |
| oldname = XSTR (XEXP (rtlname, 0), 0); |
| else |
| abort (); |
| |
| if (arm_dllexport_name_p (oldname)) |
| abort (); /* this shouldn't happen */ |
| else if (arm_dllimport_name_p (oldname)) |
| return; /* already done */ |
| |
| /* ??? One can well ask why we're making these checks here, |
| and that would be a good question. */ |
| |
| /* Imported variables can't be initialized. */ |
| if (TREE_CODE (decl) == VAR_DECL |
| && !DECL_VIRTUAL_P (decl) |
| && DECL_INITIAL (decl)) |
| { |
| error_with_decl (decl, "initialized variable `%s' is marked dllimport"); |
| return; |
| } |
| /* Nor can they be static. */ |
| if (TREE_CODE (decl) == VAR_DECL |
| /* ??? Is this test for vtables needed? */ |
| && !DECL_VIRTUAL_P (decl) |
| && 0 /*???*/) |
| { |
| error_with_decl (decl, "static variable `%s' is marked dllimport"); |
| return; |
| } |
| |
| /* `extern' needn't be specified with dllimport. |
| Specify `extern' now and hope for the best. Sigh. */ |
| if (TREE_CODE (decl) == VAR_DECL |
| /* ??? Is this test for vtables needed? */ |
| && !DECL_VIRTUAL_P (decl)) |
| { |
| DECL_EXTERNAL (decl) = 1; |
| TREE_PUBLIC (decl) = 1; |
| } |
| |
| newname = alloca (strlen (oldname) + 11); |
| sprintf (newname, "%ci.__imp_%s", ARM_PE_FLAG_CHAR, oldname); |
| |
| /* We pass newname through get_identifier to ensure it has a unique |
| address. RTL processing can sometimes peek inside the symbol ref |
| and compare the string's addresses to see if two symbols are |
| identical. */ |
| /* ??? At least I think that's why we do this. */ |
| idp = get_identifier (newname); |
| |
| newrtl = gen_rtx (MEM, Pmode, |
| gen_rtx (SYMBOL_REF, Pmode, |
| IDENTIFIER_POINTER (idp))); |
| XEXP (DECL_RTL (decl), 0) = newrtl; |
| } |
| |
| /* Cover function to implement ENCODE_SECTION_INFO. */ |
| |
| void |
| arm_pe_encode_section_info (decl) |
| tree decl; |
| { |
| /* This bit is copied from arm.h. */ |
| if (optimize > 0 && TREE_CONSTANT (decl) |
| && (!flag_writable_strings || TREE_CODE (decl) != STRING_CST)) |
| { |
| rtx rtl = (TREE_CODE_CLASS (TREE_CODE (decl)) != 'd' |
| ? TREE_CST_RTL (decl) : DECL_RTL (decl)); |
| SYMBOL_REF_FLAG (XEXP (rtl, 0)) = 1; |
| } |
| |
| /* Mark the decl so we can tell from the rtl whether the object is |
| dllexport'd or dllimport'd. */ |
| if (arm_dllexport_p (decl)) |
| arm_mark_dllexport (decl); |
| else if (arm_dllimport_p (decl)) |
| arm_mark_dllimport (decl); |
| /* It might be that DECL has already been marked as dllimport, but a |
| subsequent definition nullified that. The attribute is gone but |
| DECL_RTL still has @i.__imp_foo. We need to remove that. */ |
| else if ((TREE_CODE (decl) == FUNCTION_DECL |
| || TREE_CODE (decl) == VAR_DECL) |
| && DECL_RTL (decl) != NULL_RTX |
| && GET_CODE (DECL_RTL (decl)) == MEM |
| && GET_CODE (XEXP (DECL_RTL (decl), 0)) == MEM |
| && GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == SYMBOL_REF |
| && arm_dllimport_name_p (XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0))) |
| { |
| const char *oldname = XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0); |
| tree idp = get_identifier (oldname + 9); |
| rtx newrtl = gen_rtx (SYMBOL_REF, Pmode, IDENTIFIER_POINTER (idp)); |
| |
| XEXP (DECL_RTL (decl), 0) = newrtl; |
| |
| /* We previously set TREE_PUBLIC and DECL_EXTERNAL. |
| ??? We leave these alone for now. */ |
| } |
| } |
| |
| /* Cover function for UNIQUE_SECTION. */ |
| |
| void |
| arm_pe_unique_section (decl, reloc) |
| tree decl; |
| int reloc; |
| { |
| int len; |
| const char * name; |
| char * string; |
| char * prefix; |
| |
| name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); |
| /* Strip off any encoding in fnname. */ |
| STRIP_NAME_ENCODING (name, name); |
| |
| /* The object is put in, for example, section .text$foo. |
| The linker will then ultimately place them in .text |
| (everything from the $ on is stripped). */ |
| if (TREE_CODE (decl) == FUNCTION_DECL) |
| prefix = ".text$"; |
| else if (DECL_READONLY_SECTION (decl, reloc)) |
| prefix = ".rdata$"; |
| else |
| prefix = ".data$"; |
| len = strlen (name) + strlen (prefix); |
| string = alloca (len + 1); |
| sprintf (string, "%s%s", prefix, name); |
| |
| DECL_SECTION_NAME (decl) = build_string (len, string); |
| } |