+#ifdef GHCI
+
+/* 9 bits of return code for constructors created by the interpreter. */
+FN_(stg_interp_constr_entry)
+{
+ /* R1 points at the constructor */
+ FB_
+ /* STGCALL2(fprintf,stderr,"stg_interp_constr_entry (direct return)!\n"); */
+ /* Pointless, since SET_TAG doesn't do anything */
+ SET_TAG( GET_TAG(GET_INFO(R1.cl)));
+ JMP_(ENTRY_CODE((P_)(*Sp)));
+ FE_
+}
+
+FN_(stg_interp_constr1_entry) { FB_ JMP_(RET_VEC((P_)(*Sp),0)); FE_ }
+FN_(stg_interp_constr2_entry) { FB_ JMP_(RET_VEC((P_)(*Sp),1)); FE_ }
+FN_(stg_interp_constr3_entry) { FB_ JMP_(RET_VEC((P_)(*Sp),2)); FE_ }
+FN_(stg_interp_constr4_entry) { FB_ JMP_(RET_VEC((P_)(*Sp),3)); FE_ }
+FN_(stg_interp_constr5_entry) { FB_ JMP_(RET_VEC((P_)(*Sp),4)); FE_ }
+FN_(stg_interp_constr6_entry) { FB_ JMP_(RET_VEC((P_)(*Sp),5)); FE_ }
+FN_(stg_interp_constr7_entry) { FB_ JMP_(RET_VEC((P_)(*Sp),6)); FE_ }
+FN_(stg_interp_constr8_entry) { FB_ JMP_(RET_VEC((P_)(*Sp),7)); FE_ }
+
+/* Some info tables to be used when compiled code returns a value to
+ the interpreter, i.e. the interpreter pushes one of these onto the
+ stack before entering a value. What the code does is to
+ impedance-match the compiled return convention (in R1p/R1n/F1/D1 etc) to
+ the interpreter's convention (returned value is on top of stack),
+ and then cause the scheduler to enter the interpreter.
+
+ On entry, the stack (growing down) looks like this:
+
+ ptr to BCO holding return continuation
+ ptr to one of these info tables.
+
+ The info table code, both direct and vectored, must:
+ * push R1/F1/D1 on the stack, and its tag if necessary
+ * push the BCO (so it's now on the stack twice)
+ * Yield, ie, go to the scheduler.
+
+ Scheduler examines the t.o.s, discovers it is a BCO, and proceeds
+ directly to the bytecode interpreter. That pops the top element
+ (the BCO, containing the return continuation), and interprets it.
+ Net result: return continuation gets interpreted, with the
+ following stack:
+
+ ptr to this BCO
+ ptr to the info table just jumped thru
+ return value
+
+ which is just what we want -- the "standard" return layout for the
+ interpreter. Hurrah!
+
+ Don't ask me how unboxed tuple returns are supposed to work. We
+ haven't got a good story about that yet.
+*/
+
+/* When the returned value is in R1 and it is a pointer, so doesn't
+ need tagging ... */
+#define STG_CtoI_RET_R1p_Template(label) \
+ IFN_(label) \
+ { \
+ StgPtr bco; \
+ FB_ \
+ bco = ((StgPtr*)Sp)[1]; \
+ Sp -= 1; \
+ ((StgPtr*)Sp)[0] = R1.p; \
+ Sp -= 1; \
+ ((StgPtr*)Sp)[0] = bco; \
+ JMP_(stg_yield_to_interpreter); \
+ FE_ \
+ }
+
+STG_CtoI_RET_R1p_Template(stg_ctoi_ret_R1p_entry);
+STG_CtoI_RET_R1p_Template(stg_ctoi_ret_R1p_0_entry);
+STG_CtoI_RET_R1p_Template(stg_ctoi_ret_R1p_1_entry);
+STG_CtoI_RET_R1p_Template(stg_ctoi_ret_R1p_2_entry);
+STG_CtoI_RET_R1p_Template(stg_ctoi_ret_R1p_3_entry);
+STG_CtoI_RET_R1p_Template(stg_ctoi_ret_R1p_4_entry);
+STG_CtoI_RET_R1p_Template(stg_ctoi_ret_R1p_5_entry);
+STG_CtoI_RET_R1p_Template(stg_ctoi_ret_R1p_6_entry);
+STG_CtoI_RET_R1p_Template(stg_ctoi_ret_R1p_7_entry);
+
+VEC_POLY_INFO_TABLE(stg_ctoi_ret_R1p,0, NULL/*srt*/, 0/*srt_off*/, 0/*srt_len*/, RET_BCO,, EF_);
+
+
+
+/* When the returned value is in R1 and it isn't a pointer. */
+#define STG_CtoI_RET_R1n_Template(label) \
+ IFN_(label) \
+ { \
+ StgPtr bco; \
+ FB_ \
+ bco = ((StgPtr*)Sp)[1]; \
+ Sp -= 1; \
+ ((StgPtr*)Sp)[0] = (StgPtr)R1.i; \
+ Sp -= 1; \
+ ((StgPtr*)Sp)[0] = (StgPtr)1; /* tag */ \
+ Sp -= 1; \
+ ((StgPtr*)Sp)[0] = bco; \
+ JMP_(stg_yield_to_interpreter); \
+ FE_ \
+ }
+
+STG_CtoI_RET_R1n_Template(stg_ctoi_ret_R1n_entry);
+STG_CtoI_RET_R1n_Template(stg_ctoi_ret_R1n_0_entry);
+STG_CtoI_RET_R1n_Template(stg_ctoi_ret_R1n_1_entry);
+STG_CtoI_RET_R1n_Template(stg_ctoi_ret_R1n_2_entry);
+STG_CtoI_RET_R1n_Template(stg_ctoi_ret_R1n_3_entry);
+STG_CtoI_RET_R1n_Template(stg_ctoi_ret_R1n_4_entry);
+STG_CtoI_RET_R1n_Template(stg_ctoi_ret_R1n_5_entry);
+STG_CtoI_RET_R1n_Template(stg_ctoi_ret_R1n_6_entry);
+STG_CtoI_RET_R1n_Template(stg_ctoi_ret_R1n_7_entry);
+
+VEC_POLY_INFO_TABLE(stg_ctoi_ret_R1n,0, NULL/*srt*/, 0/*srt_off*/, 0/*srt_len*/, RET_BCO,, EF_);
+
+
+
+/* When the returned value is in F1 ... */
+#define STG_CtoI_RET_F1_Template(label) \
+ IFN_(label) \
+ { \
+ StgPtr bco; \
+ FB_ \
+ bco = ((StgPtr*)Sp)[1]; \
+ Sp -= sizeofW(StgFloat); \
+ ASSIGN_FLT((W_*)Sp, F1); \
+ Sp -= 1; \
+ ((StgPtr*)Sp)[0] = (StgPtr)sizeofW(StgFloat); \
+ Sp -= 1; \
+ ((StgPtr*)Sp)[0] = bco; \
+ JMP_(stg_yield_to_interpreter); \
+ FE_ \
+ }
+
+STG_CtoI_RET_F1_Template(stg_ctoi_ret_F1_entry);
+STG_CtoI_RET_F1_Template(stg_ctoi_ret_F1_0_entry);
+STG_CtoI_RET_F1_Template(stg_ctoi_ret_F1_1_entry);
+STG_CtoI_RET_F1_Template(stg_ctoi_ret_F1_2_entry);
+STG_CtoI_RET_F1_Template(stg_ctoi_ret_F1_3_entry);
+STG_CtoI_RET_F1_Template(stg_ctoi_ret_F1_4_entry);
+STG_CtoI_RET_F1_Template(stg_ctoi_ret_F1_5_entry);
+STG_CtoI_RET_F1_Template(stg_ctoi_ret_F1_6_entry);
+STG_CtoI_RET_F1_Template(stg_ctoi_ret_F1_7_entry);
+
+VEC_POLY_INFO_TABLE(stg_ctoi_ret_F1,0, NULL/*srt*/, 0/*srt_off*/, 0/*srt_len*/, RET_BCO,, EF_);
+
+
+/* When the returned value is in D1 ... */
+#define STG_CtoI_RET_D1_Template(label) \
+ IFN_(label) \
+ { \
+ StgPtr bco; \
+ FB_ \
+ bco = ((StgPtr*)Sp)[1]; \
+ Sp -= sizeofW(StgDouble); \
+ ASSIGN_DBL((W_*)Sp, D1); \
+ Sp -= 1; \
+ ((StgPtr*)Sp)[0] = (StgPtr)sizeofW(StgDouble); \
+ Sp -= 1; \
+ ((StgPtr*)Sp)[0] = bco; \
+ JMP_(stg_yield_to_interpreter); \
+ FE_ \
+ }
+
+STG_CtoI_RET_D1_Template(stg_ctoi_ret_D1_entry);
+STG_CtoI_RET_D1_Template(stg_ctoi_ret_D1_0_entry);
+STG_CtoI_RET_D1_Template(stg_ctoi_ret_D1_1_entry);
+STG_CtoI_RET_D1_Template(stg_ctoi_ret_D1_2_entry);
+STG_CtoI_RET_D1_Template(stg_ctoi_ret_D1_3_entry);
+STG_CtoI_RET_D1_Template(stg_ctoi_ret_D1_4_entry);
+STG_CtoI_RET_D1_Template(stg_ctoi_ret_D1_5_entry);
+STG_CtoI_RET_D1_Template(stg_ctoi_ret_D1_6_entry);
+STG_CtoI_RET_D1_Template(stg_ctoi_ret_D1_7_entry);
+
+VEC_POLY_INFO_TABLE(stg_ctoi_ret_D1,0, NULL/*srt*/, 0/*srt_off*/, 0/*srt_len*/, RET_BCO,, EF_);
+
+
+/* The other way round: when the interpreter returns a value to
+ compiled code. The stack looks like this:
+
+ return info table (pushed by compiled code)
+ return value (pushed by interpreter)
+
+ If the value is ptr-rep'd, the interpreter simply returns to the
+ scheduler, instructing it to ThreadEnterGHC.
+
+ Otherwise (unboxed return value), we replace the top stack word,
+ which must be the tag, with stg_gc_unbx_r1_info (or f1_info or d1_info),
+ and return to the scheduler, instructing it to ThreadRunGHC.
+
+ No supporting code needed!
+*/
+
+
+/* Entering a BCO. Heave it on the stack and defer to the
+ scheduler. */
+INFO_TABLE(stg_BCO_info,stg_BCO_entry,4,0,BCO,,EF_,"BCO","BCO");
+STGFUN(stg_BCO_entry) {
+ FB_
+ Sp -= 1;
+ Sp[0] = R1.w;
+ JMP_(stg_yield_to_interpreter);
+ FE_
+}
+
+#endif /* GHCI */
+
+
+/* -----------------------------------------------------------------------------
+ Entry code for an indirection.
projects / ghc-hetmet.git / blobdiff