/* -----------------------------------------------------------------------------
- * $Id: Regs.h,v 1.10 2001/11/08 12:46:31 simonmar 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;
StgUnion rR6;
StgUnion rR7;
StgUnion rR8;
- StgUnion rR9; // used occasionally by heap/stack checks
- StgUnion rR10; // used occasionally by heap/stack checks
+ StgUnion rR9; /* used occasionally by heap/stack checks */
+ StgUnion rR10; /* used occasionally by heap/stack checks */
StgFloat rF1;
StgFloat rF2;
StgFloat rF3;
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
-#if defined(SMP)
- struct StgRegTable_ *link; // per-task register tables are linked together
+ StgSparkPool rSparks; /* per-task spark pool */
#endif
} StgRegTable;
* structure, so that we can index both forwards and backwards to take
* advantage of shorter instruction forms on some archs (eg. x86).
*/
-typedef struct {
+typedef struct Capability_ {
StgFunTable f;
StgRegTable r;
+#if defined(SMP)
+ struct Capability_ *link; /* per-task register tables are linked together */
+#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)
#define SAVE_CurrentTSO (BaseReg->rCurrentTSO)
#define SAVE_CurrentNursery (BaseReg->rCurrentNursery)
#define SAVE_HpAlloc (BaseReg->rHpAlloc)
-#if defined(SMP) || defined(PAR)
#define SAVE_SparkHd (BaseReg->rSparks.hd)
#define SAVE_SparkTl (BaseReg->rSparks.tl)
#define SAVE_SparkBase (BaseReg->rSparks.base)
#define SAVE_SparkLim (BaseReg->rSparks.lim)
-#endif
/* We sometimes need to save registers across a C-call, eg. if they
* are clobbered in the standard calling convention. We define the
* again for no good reason (on register-poor architectures).
*/
+/* define NO_REGS to omit register declarations - used in RTS C code
+ * that needs all the STG definitions but not the global register
+ * settings.
+ */
#define GLOBAL_REG_DECL(type,name,reg) register type name REG(reg);
-#ifdef REG_R1
+#if defined(REG_R1) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgUnion,R1,REG_R1)
#else
-#define R1 (BaseReg->rR1)
+# define R1 (BaseReg->rR1)
#endif
-#ifdef REG_R2
+#if defined(REG_R2) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgUnion,R2,REG_R2)
#else
-#define R2 (BaseReg->rR2)
+# define R2 (BaseReg->rR2)
#endif
-#ifdef REG_R3
+#if defined(REG_R3) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgUnion,R3,REG_R3)
#else
# define R3 (BaseReg->rR3)
#endif
-#ifdef REG_R4
+#if defined(REG_R4) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgUnion,R4,REG_R4)
#else
# define R4 (BaseReg->rR4)
#endif
-#ifdef REG_R5
+#if defined(REG_R5) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgUnion,R5,REG_R5)
#else
# define R5 (BaseReg->rR5)
#endif
-#ifdef REG_R6
+#if defined(REG_R6) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgUnion,R6,REG_R6)
#else
# define R6 (BaseReg->rR6)
#endif
-#ifdef REG_R7
+#if defined(REG_R7) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgUnion,R7,REG_R7)
#else
# define R7 (BaseReg->rR7)
#endif
-#ifdef REG_R8
+#if defined(REG_R8) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgUnion,R8,REG_R8)
#else
# define R8 (BaseReg->rR8)
#endif
-#ifdef REG_R9
+#if defined(REG_R9) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgUnion,R9,REG_R9)
#else
# define R9 (BaseReg->rR9)
#endif
-#ifdef REG_R10
+#if defined(REG_R10) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgUnion,R10,REG_R10)
#else
# define R10 (BaseReg->rR10)
#endif
-#ifdef REG_F1
+#if defined(REG_F1) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgFloat,F1,REG_F1)
#else
#define F1 (BaseReg->rF1)
#endif
-#ifdef REG_F2
+#if defined(REG_F2) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgFloat,F2,REG_F2)
#else
#define F2 (BaseReg->rF2)
#endif
-#ifdef REG_F3
+#if defined(REG_F3) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgFloat,F3,REG_F3)
#else
#define F3 (BaseReg->rF3)
#endif
-#ifdef REG_F4
+#if defined(REG_F4) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgFloat,F4,REG_F4)
#else
#define F4 (BaseReg->rF4)
#endif
-#ifdef REG_D1
+#if defined(REG_D1) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgDouble,D1,REG_D1)
#else
#define D1 (BaseReg->rD1)
#endif
-#ifdef REG_D2
+#if defined(REG_D2) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgDouble,D2,REG_D2)
#else
#define D2 (BaseReg->rD2)
#endif
-#ifdef REG_L1
+#if defined(REG_L1) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgWord64,L1,REG_L1)
#else
#define L1 (BaseReg->rL1)
* concurrent Haskell, MainRegTable otherwise).
*/
-#ifdef REG_Base
+#if defined(REG_Base) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(StgRegTable *,BaseReg,REG_Base)
#else
#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
+#if defined(REG_Sp) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(P_,Sp,REG_Sp)
#else
#define Sp (BaseReg->rSp)
#endif
-#ifdef REG_Su
-GLOBAL_REG_DECL(StgUpdateFrame *,Su,REG_Su)
-#else
-#define Su (BaseReg->rSu)
-#endif
-
-#ifdef REG_SpLim
+#if defined(REG_SpLim) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(P_,SpLim,REG_SpLim)
#else
#define SpLim (BaseReg->rSpLim)
#endif
-#ifdef REG_Hp
+#if defined(REG_Hp) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(P_,Hp,REG_Hp)
#else
#define Hp (BaseReg->rHp)
#endif
-#ifdef REG_HpLim
+#if defined(REG_HpLim) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(P_,HpLim,REG_HpLim)
#else
#define HpLim (BaseReg->rHpLim)
#endif
-#ifdef REG_CurrentTSO
-GLOBAL_REG_DECL(StgTSO *,CurrentTSO,REG_CurrentTSO)
+#if defined(REG_CurrentTSO) && !defined(NO_GLOBAL_REG_DECLS)
+GLOBAL_REG_DECL(struct _StgTSO *,CurrentTSO,REG_CurrentTSO)
#else
#define CurrentTSO (BaseReg->rCurrentTSO)
#endif
-#ifdef REG_CurrentNursery
+#if defined(REG_CurrentNursery) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(bdescr *,CurrentNursery,REG_CurrentNursery)
#else
#define CurrentNursery (BaseReg->rCurrentNursery)
#endif
-#ifdef REG_HpAlloc
+#if defined(REG_HpAlloc) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(bdescr *,HpAlloc,REG_HpAlloc)
#else
#define HpAlloc (BaseReg->rHpAlloc)
#endif
-#ifdef REG_SparkHd
+#if defined(REG_SparkHd) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(bdescr *,SparkHd,REG_SparkHd)
#else
#define SparkHd (BaseReg->rSparks.hd)
#endif
-#ifdef REG_SparkTl
+#if defined(REG_SparkTl) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(bdescr *,SparkTl,REG_SparkTl)
#else
#define SparkTl (BaseReg->rSparks.tl)
#endif
-#ifdef REG_SparkBase
+#if defined(REG_SparkBase) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(bdescr *,SparkBase,REG_SparkBase)
#else
#define SparkBase (BaseReg->rSparks.base)
#endif
-#ifdef REG_SparkLim
+#if defined(REG_SparkLim) && !defined(NO_GLOBAL_REG_DECLS)
GLOBAL_REG_DECL(bdescr *,SparkLim,REG_SparkLim)
#else
#define SparkLim (BaseReg->rSparks.lim)
#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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