X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fconfig%2Favr%2Favr.h;h=67e0c8f04f1d30ac97d9787573e284d62f754b29;hb=dedfd6698f05d131adf09d2e5dcd443b8f200666;hp=308d9a4f94705e92f7d47e58a9fd332baff9f887;hpb=6f25240879fc6c52390b934bf19d341a6a33654c;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/config/avr/avr.h b/gcc/config/avr/avr.h index 308d9a4f947..67e0c8f04f1 100644 --- a/gcc/config/avr/avr.h +++ b/gcc/config/avr/avr.h @@ -1,8 +1,9 @@ /* Definitions of target machine for GNU compiler, for ATMEL AVR at90s8515, ATmega103/103L, ATmega603/603L microcontrollers. Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, - 2008 Free Software Foundation, Inc. - Contributed by Denis Chertykov (denisc@overta.ru) + 2008, 2009, 2010 + Free Software Foundation, Inc. + Contributed by Denis Chertykov (chertykov@gmail.com) This file is part of GCC. @@ -44,60 +45,67 @@ struct base_arch_s { /* Core have 'EICALL' and 'EIJMP' instructions. */ int have_eijmp_eicall; - /* Reserved. */ + /* Reserved for xmega architecture. */ int reserved; + + /* Reserved for xmega architecture. */ + int reserved2; + /* Default start of data section address for architecture. */ + int default_data_section_start; + const char *const macro; + + /* Architecture name. */ + const char *const arch_name; }; -extern const struct base_arch_s *avr_current_arch; +/* These names are used as the index into the avr_arch_types[] table + above. */ -#define TARGET_CPU_CPP_BUILTINS() \ - do \ - { \ - builtin_define_std ("AVR"); \ - if (avr_current_arch->macro) \ - builtin_define (avr_current_arch->macro); \ - if (avr_extra_arch_macro) \ - builtin_define (avr_extra_arch_macro); \ - if (avr_current_arch->have_elpm) \ - builtin_define ("__AVR_HAVE_RAMPZ__"); \ - if (avr_current_arch->have_elpm) \ - builtin_define ("__AVR_HAVE_ELPM__"); \ - if (avr_current_arch->have_elpmx) \ - builtin_define ("__AVR_HAVE_ELPMX__"); \ - if (avr_current_arch->have_movw_lpmx) \ - { \ - builtin_define ("__AVR_HAVE_MOVW__"); \ - builtin_define ("__AVR_HAVE_LPMX__"); \ - } \ - if (avr_current_arch->asm_only) \ - builtin_define ("__AVR_ASM_ONLY__"); \ - if (avr_current_arch->have_mul) \ - { \ - builtin_define ("__AVR_ENHANCED__"); \ - builtin_define ("__AVR_HAVE_MUL__"); \ - } \ - if (avr_current_arch->have_jmp_call) \ - { \ - builtin_define ("__AVR_MEGA__"); \ - builtin_define ("__AVR_HAVE_JMP_CALL__"); \ - } \ - if (avr_current_arch->have_eijmp_eicall) \ - { \ - builtin_define ("__AVR_HAVE_EIJMP_EICALL__"); \ - builtin_define ("__AVR_3_BYTE_PC__"); \ - } \ - else \ - { \ - builtin_define ("__AVR_2_BYTE_PC__"); \ - } \ - if (TARGET_NO_INTERRUPTS) \ - builtin_define ("__NO_INTERRUPTS__"); \ - } \ - while (0) +enum avr_arch +{ + ARCH_UNKNOWN, + ARCH_AVR1, + ARCH_AVR2, + ARCH_AVR25, + ARCH_AVR3, + ARCH_AVR31, + ARCH_AVR35, + ARCH_AVR4, + ARCH_AVR5, + ARCH_AVR51, + ARCH_AVR6 +}; + +struct mcu_type_s { + /* Device name. */ + const char *const name; + + /* Index in avr_arch_types[]. */ + int arch; + + /* Must lie outside user's namespace. NULL == no macro. */ + const char *const macro; + + /* Stack pointer have 8 bits width. */ + int short_sp; + + /* Start of data section. */ + int data_section_start; + + /* Name of device library. */ + const char *const library_name; +}; +/* Preprocessor macros to define depending on MCU type. */ extern const char *avr_extra_arch_macro; +extern const struct base_arch_s *avr_current_arch; +extern const struct mcu_type_s *avr_current_device; +extern const struct mcu_type_s avr_mcu_types[]; +extern const struct base_arch_s avr_arch_types[]; + +#define TARGET_CPU_CPP_BUILTINS() avr_cpu_cpp_builtins (pfile) #if !defined(IN_LIBGCC2) && !defined(IN_TARGET_LIBS) extern GTY(()) section *progmem_section; @@ -109,6 +117,7 @@ extern GTY(()) section *progmem_section; #define AVR_HAVE_LPMX (avr_current_arch->have_movw_lpmx) #define AVR_HAVE_RAMPZ (avr_current_arch->have_elpm) #define AVR_HAVE_EIJMP_EICALL (avr_current_arch->have_eijmp_eicall) +#define AVR_HAVE_8BIT_SP (avr_current_device->short_sp || TARGET_TINY_STACK) #define AVR_2_BYTE_PC (!AVR_HAVE_EIJMP_EICALL) #define AVR_3_BYTE_PC (AVR_HAVE_EIJMP_EICALL) @@ -223,7 +232,7 @@ extern GTY(()) section *progmem_section; 32,33,34,35 \ } -#define ORDER_REGS_FOR_LOCAL_ALLOC order_regs_for_local_alloc () +#define ADJUST_REG_ALLOC_ORDER order_regs_for_local_alloc () #define HARD_REGNO_NREGS(REGNO, MODE) ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) @@ -350,8 +359,6 @@ enum reg_class { #define STATIC_CHAIN_REGNUM 2 -#define FRAME_POINTER_REQUIRED frame_pointer_required_p() - /* Offset from the frame pointer register value to the top of the stack. */ #define FRAME_POINTER_CFA_OFFSET(FNDECL) 0 @@ -360,18 +367,10 @@ enum reg_class { {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM} \ ,{FRAME_POINTER_REGNUM+1,STACK_POINTER_REGNUM+1}} -#define CAN_ELIMINATE(FROM, TO) (((FROM) == ARG_POINTER_REGNUM \ - && (TO) == FRAME_POINTER_REGNUM) \ - || (((FROM) == FRAME_POINTER_REGNUM \ - || (FROM) == FRAME_POINTER_REGNUM+1) \ - && ! FRAME_POINTER_REQUIRED \ - )) - #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \ - OFFSET = initial_elimination_offset (FROM, TO) + OFFSET = avr_initial_elimination_offset (FROM, TO) -#define RETURN_ADDR_RTX(count, x) \ - gen_rtx_MEM (Pmode, memory_address (Pmode, plus_constant (tem, 1))) +#define RETURN_ADDR_RTX(count, tem) avr_return_addr_rtx (count, tem) /* Don't use Push rounding. expr.c: emit_single_push_insn is broken for POST_DEC targets (PR27386). */ @@ -409,46 +408,13 @@ extern int avr_reg_order[]; #define HAVE_POST_INCREMENT 1 #define HAVE_PRE_DECREMENT 1 -#define CONSTANT_ADDRESS_P(X) CONSTANT_P (X) - #define MAX_REGS_PER_ADDRESS 1 -#ifdef REG_OK_STRICT -# define GO_IF_LEGITIMATE_ADDRESS(mode, operand, ADDR) \ -{ \ - if (legitimate_address_p (mode, operand, 1)) \ - goto ADDR; \ -} -# else -# define GO_IF_LEGITIMATE_ADDRESS(mode, operand, ADDR) \ -{ \ - if (legitimate_address_p (mode, operand, 0)) \ - goto ADDR; \ -} -#endif - #define REG_OK_FOR_BASE_NOSTRICT_P(X) \ (REGNO (X) >= FIRST_PSEUDO_REGISTER || REG_OK_FOR_BASE_STRICT_P(X)) #define REG_OK_FOR_BASE_STRICT_P(X) REGNO_OK_FOR_BASE_P (REGNO (X)) -#ifdef REG_OK_STRICT -# define REG_OK_FOR_BASE_P(X) REG_OK_FOR_BASE_STRICT_P (X) -#else -# define REG_OK_FOR_BASE_P(X) REG_OK_FOR_BASE_NOSTRICT_P (X) -#endif - -#define REG_OK_FOR_INDEX_P(X) 0 - -#define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN) \ -{ \ - (X) = legitimize_address (X, OLDX, MODE); \ - if (memory_address_p (MODE, X)) \ - goto WIN; \ -} - -#define XEXP_(X,Y) (X) - /* LEGITIMIZE_RELOAD_ADDRESS will allow register R26/27 to be used, where it is no worse than normal base pointers R28/29 and R30/31. For example: If base offset is greater than 63 bytes or for R++ or --R addressing. */ @@ -494,8 +460,6 @@ do { \ } \ } while(0) -#define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR,LABEL) - #define LEGITIMATE_CONSTANT_P(X) 1 #define REGISTER_MOVE_COST(MODE, FROM, TO) ((FROM) == STACK_REG ? 6 \ @@ -590,10 +554,7 @@ do { \ specific tm.h file (depending upon the particulars of your assembler). */ #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ -do { \ - ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \ - ASM_OUTPUT_LABEL (FILE, NAME); \ -} while (0) +avr_asm_declare_function_name ((FILE), (NAME), (DECL)) #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \ do { \ @@ -735,11 +696,10 @@ fprintf (STREAM, "\t.skip %lu,0\n", (unsigned long)(N)) fprintf (STREAM, "\t.p2align\t%d\n", POWER); \ } while (0) -#define CASE_VECTOR_MODE HImode - -extern int avr_case_values_threshold; +#define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \ + default_elf_asm_output_external (FILE, DECL, NAME) -#define CASE_VALUES_THRESHOLD avr_case_values_threshold +#define CASE_VECTOR_MODE HImode #undef WORD_REGISTER_OPERATIONS @@ -755,16 +715,8 @@ extern int avr_case_values_threshold; #define NO_DOLLAR_IN_LABEL 1 -#define TRAMPOLINE_TEMPLATE(FILE) \ - internal_error ("trampolines not supported") - #define TRAMPOLINE_SIZE 4 -#define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \ -{ \ - emit_move_insn (gen_rtx_MEM (HImode, plus_constant ((TRAMP), 2)), CXT); \ - emit_move_insn (gen_rtx_MEM (HImode, plus_constant ((TRAMP), 6)), FNADDR); \ -} /* Store in cc_status the expressions that the condition codes will describe after execution of an instruction whose pattern is EXP. @@ -791,6 +743,17 @@ extern int avr_case_values_threshold; #define ADJUST_INSN_LENGTH(INSN, LENGTH) (LENGTH =\ adjust_insn_length (INSN, LENGTH)) +extern const char *avr_device_to_arch (int argc, const char **argv); +extern const char *avr_device_to_data_start (int argc, const char **argv); +extern const char *avr_device_to_startfiles (int argc, const char **argv); +extern const char *avr_device_to_devicelib (int argc, const char **argv); + +#define EXTRA_SPEC_FUNCTIONS \ + { "device_to_arch", avr_device_to_arch }, \ + { "device_to_data_start", avr_device_to_data_start }, \ + { "device_to_startfile", avr_device_to_startfiles }, \ + { "device_to_devicelib", avr_device_to_devicelib }, + #define CPP_SPEC "%{posix:-D_POSIX_SOURCE}" #define CC1_SPEC "%{profile:-p}" @@ -813,89 +776,8 @@ mmcu=*:-mmcu=%*}" %{mmcu=atmega64*|\ mmcu=at90can64*|\ mmcu=at90usb64*:--pmem-wrap-around=64k}}}\ -%{!mmcu*: -m avr2}\ -%{mmcu=at90s1200|\ - mmcu=attiny11|\ - mmcu=attiny12|\ - mmcu=attiny15|\ - mmcu=attiny28: -m avr1}\ -%{mmcu=attiny22|\ - mmcu=attiny26|\ - mmcu=at90s2*|\ - mmcu=at90s4*|\ - mmcu=at90s8*|\ - mmcu=at90c8*|\ - mmcu=at86rf401|\ - mmcu=attiny13*|\ - mmcu=attiny2313|\ - mmcu=attiny24|\ - mmcu=attiny25|\ - mmcu=attiny261|\ - mmcu=attiny4*|\ - mmcu=attiny8*: -m avr2}\ -%{mmcu=atmega103|\ - mmcu=at43*|\ - mmcu=at76*|\ - mmcu=at90usb82|\ - mmcu=at90usb162|\ - mmcu=attiny167: -m avr3}\ -%{mmcu=atmega8*|\ - mmcu=atmega4*|\ - mmcu=at90pwm1|\ - mmcu=at90pwm2|\ - mmcu=at90pwm2b|\ - mmcu=at90pwm3|\ - mmcu=at90pwm3b: -m avr4}\ -%{mmcu=atmega16*|\ - mmcu=atmega32*|\ - mmcu=atmega406|\ - mmcu=atmega64*|\ - mmcu=atmega128*|\ - mmcu=at90can*|\ - mmcu=at90pwm216|\ - mmcu=at90pwm316|\ - mmcu=at90usb64*|\ - mmcu=at90usb128*|\ - mmcu=at94k: -m avr5}\ -%{mmcu=atmega256*:-m avr6}\ -%{mmcu=atmega324*|\ - mmcu=atmega325*|\ - mmcu=atmega328p|\ - mmcu=atmega329*|\ - mmcu=atmega406|\ - mmcu=atmega48*|\ - mmcu=atmega88*|\ - mmcu=atmega64|\ - mmcu=atmega644*|\ - mmcu=atmega645*|\ - mmcu=atmega649*|\ - mmcu=atmega128|\ - mmcu=atmega1284p|\ - mmcu=atmega162|\ - mmcu=atmega164*|\ - mmcu=atmega165*|\ - mmcu=atmega168*|\ - mmcu=atmega169*|\ - mmcu=atmega4hv*|\ - mmcu=atmega8hv*|\ - mmcu=atmega16hv*|\ - mmcu=atmega32hv*|\ - mmcu=attiny48|\ - mmcu=attiny88|\ - mmcu=attiny167|\ - mmcu=at90can*|\ - mmcu=at90pwm*|\ - mmcu=atmega32c1|\ - mmcu=atmega64c1|\ - mmcu=atmega32m1|\ - mmcu=atmega64m1|\ - mmcu=atmega16u4|\ - mmcu=atmega32u*|\ - mmcu=at90usb*: -Tdata 0x800100}\ -%{mmcu=atmega640|\ - mmcu=atmega1280|\ - mmcu=atmega1281|\ - mmcu=atmega256*: -Tdata 0x800200} " +%:device_to_arch(%{mmcu=*:%*})\ +%:device_to_data_start(%{mmcu=*:%*})" #define LIB_SPEC \ "%{!mmcu=at90s1*:%{!mmcu=attiny11:%{!mmcu=attiny12:%{!mmcu=attiny15:%{!mmcu=attiny28: -lc }}}}}" @@ -906,133 +788,13 @@ mmcu=*:-mmcu=%*}" #define LIBGCC_SPEC \ "%{!mmcu=at90s1*:%{!mmcu=attiny11:%{!mmcu=attiny12:%{!mmcu=attiny15:%{!mmcu=attiny28: -lgcc }}}}}" -#define STARTFILE_SPEC "%(crt_binutils)" +#define STARTFILE_SPEC "%:device_to_startfile(%{mmcu=*:%*})" #define ENDFILE_SPEC "" -#define CRT_BINUTILS_SPECS "\ -%{mmcu=at90s1200|mmcu=avr1:crts1200.o%s} \ -%{mmcu=attiny11:crttn11.o%s} \ -%{mmcu=attiny12:crttn12.o%s} \ -%{mmcu=attiny15:crttn15.o%s} \ -%{mmcu=attiny28:crttn28.o%s} \ -%{!mmcu*|mmcu=at90s8515|mmcu=avr2:crts8515.o%s} \ -%{mmcu=at90s2313:crts2313.o%s} \ -%{mmcu=at90s2323:crts2323.o%s} \ -%{mmcu=at90s2333:crts2333.o%s} \ -%{mmcu=at90s2343:crts2343.o%s} \ -%{mmcu=attiny22:crttn22.o%s} \ -%{mmcu=attiny26:crttn26.o%s} \ -%{mmcu=at90s4433:crts4433.o%s} \ -%{mmcu=at90s4414:crts4414.o%s} \ -%{mmcu=at90s4434:crts4434.o%s} \ -%{mmcu=at90c8534:crtc8534.o%s} \ -%{mmcu=at90s8535:crts8535.o%s} \ -%{mmcu=at86rf401:crt86401.o%s} \ -%{mmcu=attiny13:crttn13.o%s} \ -%{mmcu=attiny13a:crttn13a.o%s} \ -%{mmcu=attiny2313|mmcu=avr25:crttn2313.o%s} \ -%{mmcu=attiny24:crttn24.o%s} \ -%{mmcu=attiny44:crttn44.o%s} \ -%{mmcu=attiny84:crttn84.o%s} \ -%{mmcu=attiny25:crttn25.o%s} \ -%{mmcu=attiny45:crttn45.o%s} \ -%{mmcu=attiny85:crttn85.o%s} \ -%{mmcu=attiny261:crttn261.o%s} \ -%{mmcu=attiny461:crttn461.o%s} \ -%{mmcu=attiny861:crttn861.o%s} \ -%{mmcu=attiny43u:crttn43u.o%s} \ -%{mmcu=attiny48:crttn48.o%s} \ -%{mmcu=attiny88:crttn88.o%s} \ -%{mmcu=attiny167:crttn167.o%s} \ -%{mmcu=at43usb355|mmcu=avr3:crt43355.o%s} \ -%{mmcu=at76c711:crt76711.o%s} \ -%{mmcu=atmega103|mmcu=avr31:crtm103.o%s} \ -%{mmcu=at43usb320:crt43320.o%s} \ -%{mmcu=at90usb162|mmcu=avr35:crtusb162.o%s} \ -%{mmcu=at90usb82:crtusb82.o%s} \ -%{mmcu=atmega8|mmcu=avr4:crtm8.o%s} \ -%{mmcu=atmega48:crtm48.o%s} \ -%{mmcu=atmega48p:crtm48p.o%s} \ -%{mmcu=atmega88:crtm88.o%s} \ -%{mmcu=atmega88p:crtm88p.o%s} \ -%{mmcu=atmega8515:crtm8515.o%s} \ -%{mmcu=atmega8535:crtm8535.o%s} \ -%{mmcu=at90pwm1:crt90pwm1.o%s} \ -%{mmcu=at90pwm2:crt90pwm2.o%s} \ -%{mmcu=at90pwm2b:crt90pwm2b.o%s} \ -%{mmcu=at90pwm3:crt90pwm3.o%s} \ -%{mmcu=at90pwm3b:crt90pwm3b.o%s} \ -%{mmcu=atmega16:crtm16.o%s} \ -%{mmcu=atmega161|mmcu=avr5:crtm161.o%s} \ -%{mmcu=atmega162:crtm162.o%s} \ -%{mmcu=atmega163:crtm163.o%s} \ -%{mmcu=atmega164p:crtm164p.o%s} \ -%{mmcu=atmega165:crtm165.o%s} \ -%{mmcu=atmega165p:crtm165p.o%s} \ -%{mmcu=atmega168:crtm168.o%s} \ -%{mmcu=atmega168p:crtm168p.o%s} \ -%{mmcu=atmega169:crtm169.o%s} \ -%{mmcu=atmega169p:crtm169p.o%s} \ -%{mmcu=atmega32:crtm32.o%s} \ -%{mmcu=atmega323:crtm323.o%s} \ -%{mmcu=atmega324p:crtm324p.o%s} \ -%{mmcu=atmega325:crtm325.o%s} \ -%{mmcu=atmega325p:crtm325p.o%s} \ -%{mmcu=atmega3250:crtm3250.o%s} \ -%{mmcu=atmega3250p:crtm3250p.o%s} \ -%{mmcu=atmega328p:crtm328p.o%s} \ -%{mmcu=atmega329:crtm329.o%s} \ -%{mmcu=atmega329p:crtm329p.o%s} \ -%{mmcu=atmega3290:crtm3290.o%s} \ -%{mmcu=atmega3290p:crtm3290p.o%s} \ -%{mmcu=atmega406:crtm406.o%s} \ -%{mmcu=atmega64:crtm64.o%s} \ -%{mmcu=atmega640:crtm640.o%s} \ -%{mmcu=atmega644:crtm644.o%s} \ -%{mmcu=atmega644p:crtm644p.o%s} \ -%{mmcu=atmega645:crtm645.o%s} \ -%{mmcu=atmega6450:crtm6450.o%s} \ -%{mmcu=atmega649:crtm649.o%s} \ -%{mmcu=atmega6490:crtm6490.o%s} \ -%{mmcu=atmega8hva:crtm8hva.o%s} \ -%{mmcu=atmega16hva:crtm16hva.o%s} \ -%{mmcu=atmega16hvb:crtm16hvb.o%s} \ -%{mmcu=atmega32hvb:crtm32hvb.o%s} \ -%{mmcu=atmega4hvd:crtm4hvd.o%s} \ -%{mmcu=atmega8hvd:crtm8hvd.o%s} \ -%{mmcu=at90can32:crtcan32.o%s} \ -%{mmcu=at90can64:crtcan64.o%s} \ -%{mmcu=at90pwm216:crt90pwm216.o%s} \ -%{mmcu=at90pwm316:crt90pwm316.o%s} \ -%{mmcu=atmega32c1:crtm32c1.o%s} \ -%{mmcu=atmega64c1:crtm64c1.o%s} \ -%{mmcu=atmega32m1:crtm32m1.o%s} \ -%{mmcu=atmega64m1:crtm64m1.o%s} \ -%{mmcu=atmega16u4:crtm16u4.o%s} \ -%{mmcu=atmega32u4:crtm32u4.o%s} \ -%{mmcu=atmega32u6:crtm32u6.o%s} \ -%{mmcu=at90usb646:crtusb646.o%s} \ -%{mmcu=at90usb647:crtusb647.o%s} \ -%{mmcu=at94k:crtat94k.o%s} \ -%{mmcu=atmega128|mmcu=avr51:crtm128.o%s} \ -%{mmcu=atmega1280:crtm1280.o%s} \ -%{mmcu=atmega1281:crtm1281.o%s} \ -%{mmcu=atmega1284p:crtm1284p.o%s} \ -%{mmcu=atmega2560:crtm2560.o%s} \ -%{mmcu=atmega2561:crtm2561.o%s} \ -%{mmcu=at90can128:crtcan128.o%s} \ -%{mmcu=at90usb1286:crtusb1286.o%s} \ -%{mmcu=at90usb1287:crtusb1287.o%s}" - -#define EXTRA_SPECS {"crt_binutils", CRT_BINUTILS_SPECS}, - /* This is the default without any -mmcu=* option (AT90S*). */ #define MULTILIB_DEFAULTS { "mmcu=avr2" } -/* This is undefined macro for collect2 disabling */ -#define LINKER_NAME "ld" - #define TEST_HARD_REG_CLASS(CLASS, REGNO) \ TEST_HARD_REG_BIT (reg_class_contents[ (int) (CLASS)], REGNO) @@ -1067,11 +829,8 @@ mmcu=*:-mmcu=%*}" /* A C structure for machine-specific, per-function data. This is added to the cfun structure. */ -struct machine_function GTY(()) +struct GTY(()) machine_function { - /* 'true' - if the current function is a leaf function. */ - int is_leaf; - /* 'true' - if current function is a naked function. */ int is_naked; @@ -1090,4 +849,7 @@ struct machine_function GTY(()) /* 'true' - if current function is a 'main' function as specified by the "OS_main" attribute. */ int is_OS_main; + + /* Current function stack size. */ + int stack_usage; };