/* -----------------------------------------------------------------------------
- * $Id: Regs.h,v 1.11 2002/01/24 00:40:28 sof Exp $
*
- * (c) The GHC Team, 1998-1999
+ * (c) The GHC Team, 1998-2004
*
- * Registers used in STG code. Might or might not correspond to
- * actual machine registers.
+ * Registers in the STG machine.
+ *
+ * The STG machine has a collection of "registers", each one of which
+ * may or may not correspond to an actual machine register when
+ * running code.
+ *
+ * The register set is backed by a table in memory (struct
+ * StgRegTable). If a particular STG register is not mapped to a
+ * machine register, then the apprpriate slot in this table is used
+ * instead.
+ *
+ * This table is itself pointed to by another register, BaseReg. If
+ * BaseReg is not in a machine register, then the register table is
+ * used from an absolute location (MainCapability).
*
* ---------------------------------------------------------------------------*/
#ifndef REGS_H
#define REGS_H
-/*
- * This file should do the right thing if we have no machine-registers
- * defined, i.e. everything lives in the RegTable.
- */
/*
* This is the table that holds shadow-locations for all the STG
} StgSparkPool;
typedef struct {
- StgFunPtr stgChk0;
- StgFunPtr stgChk1;
StgFunPtr stgGCEnter1;
- StgFunPtr stgUpdatePAP;
+ StgFunPtr stgGCFun;
} StgFunTable;
+/*
+ * Vanilla registers are given this union type, which is purely so
+ * that we can cast the vanilla reg to a variety of types with the
+ * minimum of syntax. eg. R1.w instead of (StgWord)R1.
+ */
+typedef union {
+ StgWord w;
+ StgAddr a;
+ StgChar c;
+ StgInt8 i8;
+ StgFloat f;
+ StgInt i;
+ StgPtr p;
+ StgClosurePtr cl;
+ StgStackOffset offset; /* unused? */
+ StgByteArray b;
+ StgTSOPtr t;
+} StgUnion;
+
typedef struct StgRegTable_ {
StgUnion rR1;
StgUnion rR2;
StgDouble rD2;
StgWord64 rL1;
StgPtr rSp;
- StgUpdateFrame *rSu;
StgPtr rSpLim;
StgPtr rHp;
StgPtr rHpLim;
- StgTSO *rCurrentTSO;
- struct _bdescr *rNursery;
- struct _bdescr *rCurrentNursery;
- StgWord rHpAlloc; // number of words being allocated in heap
+ struct StgTSO_ *rCurrentTSO;
+ struct bdescr_ *rNursery;
+ struct bdescr_ *rCurrentNursery;
+ StgWord rHpAlloc; // number of *bytes* being allocated in heap
#if defined(SMP) || defined(PAR)
StgSparkPool rSparks; // per-task spark pool
#endif
#endif
} Capability;
-/* No such thing as a MainRegTable under SMP - each thread must
- * have its own MainRegTable.
+/* No such thing as a MainCapability under SMP - each thread must have
+ * its own Capability.
*/
#ifndef SMP
+#if IN_STG_CODE
+extern W_ MainCapability[];
+#else
extern DLL_IMPORT_RTS Capability MainCapability;
#endif
+#endif
#if IN_STG_CODE
* Registers Hp and HpLim are global across the entire system, and are
* copied into the RegTable before executing a thread.
*
- * Registers Sp, Su, and SpLim are saved in the TSO for the
+ * Registers Sp and SpLim are saved in the TSO for the
* thread, but are copied into the RegTable before executing a thread.
*
* All other registers are "general purpose", and are used for passing
*/
#define SAVE_Sp (CurrentTSO->sp)
-#define SAVE_Su (CurrentTSO->su)
#define SAVE_SpLim (CurrentTSO->splim)
#define SAVE_Hp (BaseReg->rHp)
#ifdef SMP
#error BaseReg must be in a register for SMP
#endif
-#define BaseReg (&MainCapability.r)
+#define BaseReg (&((Capability *)MainCapability)[0].r)
#endif
#ifdef REG_Sp
#define Sp (BaseReg->rSp)
#endif
-#ifdef REG_Su
-GLOBAL_REG_DECL(StgUpdateFrame *,Su,REG_Su)
-#else
-#define Su (BaseReg->rSu)
-#endif
-
#ifdef REG_SpLim
GLOBAL_REG_DECL(P_,SpLim,REG_SpLim)
#else
#endif
#ifdef REG_CurrentTSO
-GLOBAL_REG_DECL(StgTSO *,CurrentTSO,REG_CurrentTSO)
+GLOBAL_REG_DECL(struct _StgTSO *,CurrentTSO,REG_CurrentTSO)
#else
#define CurrentTSO (BaseReg->rCurrentTSO)
#endif
#define FunReg ((StgFunTable *)((void *)BaseReg - sizeof(StgFunTable)))
-#define stg_chk_0 (FunReg->stgChk0)
-#define stg_chk_1 (FunReg->stgChk1)
#define stg_gc_enter_1 (FunReg->stgGCEnter1)
-#define stg_update_PAP (FunReg->stgUpdatePAP)
+#define stg_gc_fun (FunReg->stgGCFun)
/* -----------------------------------------------------------------------------
For any registers which are denoted "caller-saves" by the C calling
#define CALLER_RESTORE_Sp /* nothing */
#endif
-#ifdef CALLER_SAVES_Su
-#define CALLER_SAVE_Su SAVE_Su = Su;
-#define CALLER_RESTORE_Su Su = SAVE_Su;
-#else
-#define CALLER_SAVE_Su /* nothing */
-#define CALLER_RESTORE_Su /* nothing */
-#endif
-
#ifdef CALLER_SAVES_SpLim
#define CALLER_SAVE_SpLim SAVE_SpLim = SpLim;
#define CALLER_RESTORE_SpLim SpLim = SAVE_SpLim;
be addressed relative to it */
#define CALLER_SAVE_SYSTEM \
CALLER_SAVE_Sp \
- CALLER_SAVE_Su \
CALLER_SAVE_SpLim \
CALLER_SAVE_Hp \
CALLER_SAVE_HpLim \
#define CALLER_RESTORE_SYSTEM \
CALLER_RESTORE_Base \
CALLER_RESTORE_Sp \
- CALLER_RESTORE_Su \
CALLER_RESTORE_SpLim \
CALLER_RESTORE_Hp \
CALLER_RESTORE_HpLim \
#define CALLER_RESTORE_SYSTEM /* nothing */
#endif /* IN_STG_CODE */
-
#define CALLER_SAVE_ALL \
CALLER_SAVE_SYSTEM \
CALLER_SAVE_USER
CALLER_RESTORE_USER
#endif /* REGS_H */
-
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