X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fincludes%2FConstants.h;h=4f3c35b7448fe814facc595cc6bc31f47ec45212;hb=0372ac231bd18e993a2533f784805046876d5527;hp=4062bcaf638909d8a32e43a9f2113e3fedf6e88a;hpb=ecb14eb4fe9e0eb6cec0918cb9980a0026ad8466;p=ghc-hetmet.git diff --git a/ghc/includes/Constants.h b/ghc/includes/Constants.h index 4062bca..4f3c35b 100644 --- a/ghc/includes/Constants.h +++ b/ghc/includes/Constants.h @@ -1,7 +1,6 @@ /* ---------------------------------------------------------------------------- - * $Id: Constants.h,v 1.21 2002/09/23 14:33:50 simonmar Exp $ * - * (c) The GHC Team, 1998-1999 + * (c) The GHC Team, 1998-2002 * * Constants * @@ -21,38 +20,20 @@ /* ----------------------------------------------------------------------------- Minimum closure sizes - Here We define the minimum size for updatable closures. This must be at - least 2, to allow for cons cells and linked indirections. All updates - will be performed on closures of this size. For non-updatable closures - the minimum size is 1 to allow for a forwarding pointer. - - Linked indirections are UPD_OLDGEN things: see Closures.h - - o MIN_UPD_SIZE doesn't apply to stack closures, static closures - or non-updateable objects like PAPs or CONSTRs - o MIN_UPD_SIZE is big enough to contain any of the following: - o EVACUATED - o BLACKHOLE - o BLOCKING QUEUE - o IND, IND_PERM, IND_OLDGEN and IND_OLDGEN_PERM - (it need not be big enough for IND_STATIC - but it is) - o MIN_NONUPD_SIZE doesn't apply to stack closures, static closures - or updateable objects like APs, THUNKS or THUNK_SELECTORs - o MIN_NONUPD_SIZE is big enough to contain any of the following: - o EVACUATED + This is the minimum number of words in the payload of a + heap-allocated closure, so that the closure has enough room to be + overwritten with a forwarding pointer during garbage collection. -------------------------------------------------------------------------- */ -#define MIN_UPD_SIZE 2 -#define MIN_NONUPD_SIZE 1 +#define MIN_PAYLOAD_SIZE 1 /* ----------------------------------------------------------------------------- Constants to do with specialised closure types. -------------------------------------------------------------------------- */ -/* We have some pre-compiled selector thunks defined in - * StgSelectors.hc in the runtime system. This constant defines the - * highest selectee index that we can replace with a reference to the - * pre-compiled code. +/* We have some pre-compiled selector thunks defined in rts/StgStdThunks.hc. + * This constant defines the highest selectee index that we can replace with a + * reference to the pre-compiled code. */ #define MAX_SPEC_SELECTEE_SIZE 15 @@ -63,7 +44,7 @@ * space. */ -#define MAX_SPEC_AP_SIZE 8 +#define MAX_SPEC_AP_SIZE 7 /* Specialised FUN/THUNK/CONSTR closure types */ @@ -71,6 +52,17 @@ #define MAX_SPEC_FUN_SIZE 2 #define MAX_SPEC_CONSTR_SIZE 2 +/* Range of built-in table of static small int-like and char-like closures. + * + * NB. This corresponds with the number of actual INTLIKE/CHARLIKE + * closures defined in rts/StgMiscClosures.cmm. + */ +#define MAX_INTLIKE 16 +#define MIN_INTLIKE (-16) + +#define MAX_CHARLIKE 255 +#define MIN_CHARLIKE 0 + /* ----------------------------------------------------------------------------- STG Registers. @@ -81,24 +73,18 @@ #define MAX_VANILLA_REG 8 #define MAX_FLOAT_REG 4 #define MAX_DOUBLE_REG 2 -/* register is only used for returning (unboxed) 64-bit vals */ #define MAX_LONG_REG 1 -/*---- Maximum number of constructors in a data type for direct-returns. */ +/* ----------------------------------------------------------------------------- + * Maximum number of constructors in a data type for direct-returns. + * + * NB. There are various places that assume the value of this + * constant, such as the polymorphic return frames for updates + * (stg_upd_frame_info) and catch frames (stg_catch_frame_info). + * -------------------------------------------------------------------------- */ #define MAX_VECTORED_RTN 8 -/*---- Range of built-in table of static small int-like and char-like closures. */ - -#define MAX_INTLIKE 16 -#define MIN_INTLIKE (-16) - -#define MAX_CHARLIKE 255 -#define MIN_CHARLIKE 0 - -/* You can change these constants (I hope) but be sure to modify - rts/StgMiscClosures.hs accordingly. */ - /* ----------------------------------------------------------------------------- Semi-Tagging constants @@ -119,7 +105,7 @@ /* ----------------------------------------------------------------------------- How much C stack to reserve for local temporaries when in the STG - world. Used in StgRun.S and StgCRun.c. + world. Used in StgCRun.c. -------------------------------------------------------------------------- */ #define RESERVED_C_STACK_BYTES (2048 * SIZEOF_LONG) @@ -130,10 +116,16 @@ This must be large enough to accomodate the largest stack frame pushed in one of the heap check fragments in HeapStackCheck.hc - (ie. currently the generic heap checks - 19 words). + (ie. currently the generic heap checks - 3 words for StgRetDyn, + 18 words for the saved registers, see StgMacros.h). + + In the event of an unboxed tuple or let-no-escape stack/heap check + failure, there will be other words on the stack which are covered + by the RET_DYN frame. These will have been accounted for by stack + checks however, so we don't need to allow for them here. -------------------------------------------------------------------------- */ -#define RESERVED_STACK_WORDS 19 +#define RESERVED_STACK_WORDS 21 /* ----------------------------------------------------------------------------- Storage manager constants @@ -145,11 +137,122 @@ /* The size of a megablock (2^MBLOCK_SHIFT bytes) */ #define MBLOCK_SHIFT 20 -/* the largest size an object can be before we give it a block of its - * own and treat it as an immovable object during GC, expressed as a - * fraction of BLOCK_SIZE. +/* ----------------------------------------------------------------------------- + Bitmap/size fields (used in info tables) + -------------------------------------------------------------------------- */ + +/* In a 32-bit bitmap field, we use 5 bits for the size, and 27 bits + * for the bitmap. If the bitmap requires more than 27 bits, then we + * store it in a separate array, and leave a pointer in the bitmap + * field. On a 64-bit machine, the sizes are extended accordingly. */ -#define LARGE_OBJECT_THRESHOLD ((nat)(BLOCK_SIZE * 8 / 10)) +#if SIZEOF_VOID_P == 4 +#define BITMAP_SIZE_MASK 0x1f +#define BITMAP_BITS_SHIFT 5 +#elif SIZEOF_VOID_P == 8 +#define BITMAP_SIZE_MASK 0x3f +#define BITMAP_BITS_SHIFT 6 +#else +#error unknown SIZEOF_VOID_P +#endif -#endif /* CONSTANTS_H */ +/* ----------------------------------------------------------------------------- + Lag/Drag/Void constants + -------------------------------------------------------------------------- */ + +/* + An LDV word is divided into 3 parts: state bits (LDV_STATE_MASK), creation + time bits (LDV_CREATE_MASK), and last use time bits (LDV_LAST_MASK). + */ +#if SIZEOF_VOID_P == 8 +#define LDV_SHIFT 30 +#define LDV_STATE_MASK 0x1000000000000000 +#define LDV_CREATE_MASK 0x0FFFFFFFC0000000 +#define LDV_LAST_MASK 0x000000003FFFFFFF +#define LDV_STATE_CREATE 0x0000000000000000 +#define LDV_STATE_USE 0x1000000000000000 +#else +#define LDV_SHIFT 15 +#define LDV_STATE_MASK 0x40000000 +#define LDV_CREATE_MASK 0x3FFF8000 +#define LDV_LAST_MASK 0x00007FFF +#define LDV_STATE_CREATE 0x00000000 +#define LDV_STATE_USE 0x40000000 +#endif /* SIZEOF_VOID_P */ + +/* ----------------------------------------------------------------------------- + TSO related constants + -------------------------------------------------------------------------- */ + +/* + * Constants for the what_next field of a TSO, which indicates how it + * is to be run. + */ +#define ThreadRunGHC 1 /* return to address on top of stack */ +#define ThreadInterpret 2 /* interpret this thread */ +#define ThreadKilled 3 /* thread has died, don't run it */ +#define ThreadRelocated 4 /* thread has moved, link points to new locn */ +#define ThreadComplete 5 /* thread has finished */ + +/* + * Constants for the why_blocked field of a TSO + */ +#define NotBlocked 0 +#define BlockedOnMVar 1 +#define BlockedOnBlackHole 2 +#define BlockedOnException 3 +#define BlockedOnRead 4 +#define BlockedOnWrite 5 +#define BlockedOnDelay 6 +#define BlockedOnSTM 7 + +/* Win32 only: */ +#define BlockedOnDoProc 8 + +/* Only relevant for PAR: */ + /* blocked on a remote closure represented by a Global Address: */ +#define BlockedOnGA 9 + /* same as above but without sending a Fetch message */ +#define BlockedOnGA_NoSend 10 +/* Only relevant for THREADED_RTS: */ +#define BlockedOnCCall 11 +#define BlockedOnCCall_NoUnblockExc 12 + /* same as above but don't unblock async exceptions in resumeThread() */ + +/* + * These constants are returned to the scheduler by a thread that has + * stopped for one reason or another. See typedef StgThreadReturnCode + * in TSO.h. + */ +#define HeapOverflow 1 /* might also be StackOverflow */ +#define StackOverflow 2 +#define ThreadYielding 3 +#define ThreadBlocked 4 +#define ThreadFinished 5 +/* ----------------------------------------------------------------------------- + RET_DYN stack frames + -------------------------------------------------------------------------- */ + +/* VERY MAGIC CONSTANTS! + * must agree with code in HeapStackCheck.c, stg_gen_chk, and + * RESERVED_STACK_WORDS in Constants.h. + */ +#define RET_DYN_BITMAP_SIZE 8 +#define RET_DYN_NONPTR_REGS_SIZE 10 + +/* Sanity check that RESERVED_STACK_WORDS is reasonable. We can't + * just derive RESERVED_STACK_WORDS because it's used in Haskell code + * too. + */ +#if RESERVED_STACK_WORDS != (3 + RET_DYN_BITMAP_SIZE + RET_DYN_NONPTR_REGS_SIZE) +#error RESERVED_STACK_WORDS may be wrong! +#endif + +/* ----------------------------------------------------------------------------- + How often our context-switch timer ticks + -------------------------------------------------------------------------- */ + +#define TICK_FREQUENCY 50 /* ticks per second */ + +#endif /* CONSTANTS_H */