2 % (c) The AQUA Project, Glasgow University, 1993-1998
6 module StixMacro ( macroCode, checkCode ) where
8 #include "HsVersions.h"
9 #include "nativeGen/NCG.h"
11 import {-# SOURCE #-} StixPrim ( amodeToStix )
14 import AbsCSyn ( CStmtMacro(..), CAddrMode, tagreg, CCheckMacro(..) )
15 import Constants ( uF_RET, uF_UPDATEE, uF_SIZE )
16 import ForeignCall ( CCallConv(..) )
17 import MachOp ( MachOp(..) )
18 import PrimRep ( PrimRep(..) )
20 import Panic ( panic )
21 import UniqSupply ( returnUs, thenUs, UniqSM )
22 import CLabel ( mkBlackHoleInfoTableLabel, mkIndStaticInfoLabel,
23 mkIndInfoLabel, mkUpdInfoLabel, mkRtsGCEntryLabel )
26 The @ARGS_CHK_A{_LOAD_NODE}@ macros check for sufficient arguments on
27 the A stack, and perform a tail call to @UpdatePAP@ if the arguments are
28 not there. The @_LOAD_NODE@ version also loads R1 with an appropriate
33 :: CStmtMacro -- statement macro
34 -> [CAddrMode] -- args
35 -> UniqSM StixStmtList
38 -----------------------------------------------------------------------------
41 @UPD_CAF@ involves changing the info pointer of the closure, and
42 adding an indirection.
45 macroCode UPD_CAF args
47 [cafptr,bhptr] = map amodeToStix args
48 new_caf = StVoidable (StCall (Left FSLIT("newCAF")) CCallConv VoidRep [cafptr])
49 a1 = StAssignMem PtrRep (StIndex PtrRep cafptr fixedHS) bhptr
50 a2 = StAssignMem PtrRep cafptr ind_static_info
52 returnUs (\xs -> new_caf : a1 : a2 : xs)
55 -----------------------------------------------------------------------------
58 We do lazy blackholing: no need to overwrite thunks with blackholes
59 the minute they're entered, as long as we do it before a context
60 switch or garbage collection, that's ok.
62 Don't blackhole single entry closures, for the following reasons:
64 - if the compiler has decided that they won't be entered again,
65 that probably means that nothing has a pointer to it
66 (not necessarily true, but...)
68 - no need to blackhole for concurrency reasons, because nothing
69 can block on the result of this computation.
72 macroCode UPD_BH_UPDATABLE args = returnUs id
74 macroCode UPD_BH_SINGLE_ENTRY args = returnUs id
77 update = StAssign PtrRep (StInd PtrRep (amodeToStix arg)) bh_info
79 returnUs (\xs -> update : xs)
83 -----------------------------------------------------------------------------
86 Push an update frame on the stack.
89 macroCode PUSH_UPD_FRAME args
91 [bhptr, _{-0-}] = map amodeToStix args
92 frame n = StIndex PtrRep (StReg stgSp) (StInt (toInteger (n-uF_SIZE)))
94 -- HWL: these values are *wrong* in a GranSim setup; ToDo: fix
95 a1 = StAssignMem PtrRep (frame uF_RET) upd_frame_info
96 a4 = StAssignMem PtrRep (frame uF_UPDATEE) bhptr
98 returnUs (\xs -> a1 : a4 : xs)
101 -----------------------------------------------------------------------------
102 Setting the tag register
104 This one only applies if we have a machine register devoted to TagReg.
107 macroCode SET_TAG [tag]
108 = case get_MagicId_reg_or_addr tagreg of
112 -> let a1 = StAssignReg IntRep (StixMagicId tagreg) (amodeToStix tag)
113 in returnUs ( \xs -> a1 : xs )
116 -----------------------------------------------------------------------------
119 macroCode REGISTER_IMPORT [arg]
121 \xs -> StAssignMem WordRep (StReg stgSp) (amodeToStix arg)
122 : StAssignReg PtrRep stgSp (StMachOp MO_Nat_Add [StReg stgSp, StInt 4])
126 macroCode REGISTER_FOREIGN_EXPORT [arg]
129 StCall (Left FSLIT("getStablePtr")) CCallConv VoidRep
136 = panic "StixMacro.macroCode"
139 Do the business for a @HEAP_CHK@, having converted the args to Trees
142 -----------------------------------------------------------------------------
143 Let's make sure that these CAFs are lifted out, shall we?
146 -- Some common labels
148 bh_info, ind_static_info, ind_info :: StixExpr
150 bh_info = StCLbl mkBlackHoleInfoTableLabel
151 ind_static_info = StCLbl mkIndStaticInfoLabel
152 ind_info = StCLbl mkIndInfoLabel
153 upd_frame_info = StCLbl mkUpdInfoLabel
155 -- Some common call trees
158 -----------------------------------------------------------------------------
162 checkCode :: CCheckMacro -> [CAddrMode] -> StixStmtList -> UniqSM StixStmtList
163 checkCode macro args assts
164 = getUniqLabelNCG `thenUs` \ ulbl_fail ->
165 getUniqLabelNCG `thenUs` \ ulbl_pass ->
167 let args_stix = map amodeToStix args
168 newHp wds = StIndex PtrRep (StReg stgHp) wds
169 assign_hp wds = StAssignReg PtrRep stgHp (newHp wds)
170 hp_alloc wds = StAssignReg IntRep stgHpAlloc wds
171 test_hp = StMachOp MO_NatU_Le [StReg stgHp, StReg stgHpLim]
172 cjmp_hp = StCondJump ulbl_pass test_hp
173 newSp wds = StIndex PtrRep (StReg stgSp) (StMachOp MO_NatS_Neg [wds])
174 test_sp_pass wds = StMachOp MO_NatU_Ge [newSp wds, StReg stgSpLim]
175 test_sp_fail wds = StMachOp MO_NatU_Lt [newSp wds, StReg stgSpLim]
176 cjmp_sp_pass wds = StCondJump ulbl_pass (test_sp_pass wds)
177 cjmp_sp_fail wds = StCondJump ulbl_fail (test_sp_fail wds)
178 assign_ret r ret = mkStAssign CodePtrRep r ret
180 fail = StLabel ulbl_fail
181 join = StLabel ulbl_pass
183 -- see includes/StgMacros.h for explaination of these magic consts
186 assign_liveness ptr_regs
187 = StAssignReg WordRep stgR9
188 (StMachOp MO_Nat_Xor [StInt aLL_NON_PTRS, ptr_regs])
189 assign_reentry reentry
190 = StAssignReg WordRep stgR10 reentry
196 let [words] = args_stix
197 in (\xs -> assign_hp words : cjmp_hp :
198 assts (hp_alloc words : gc_enter : join : xs))
201 let [words] = args_stix
202 in (\xs -> cjmp_sp_pass words :
203 assts (gc_enter : join : xs))
206 let [sp_words,hp_words] = args_stix
207 in (\xs -> cjmp_sp_fail sp_words :
208 assign_hp hp_words : cjmp_hp :
210 assts (hp_alloc hp_words : gc_enter
214 let [words] = args_stix
215 in (\xs -> assign_hp words : cjmp_hp :
216 assts (hp_alloc words : gc_fun : join : xs))
219 let [words] = args_stix
220 in (\xs -> cjmp_sp_pass words :
221 assts (gc_fun : join : xs))
224 let [sp_words,hp_words] = args_stix
225 in (\xs -> cjmp_sp_fail sp_words :
226 assign_hp hp_words : cjmp_hp :
228 assts (hp_alloc hp_words
229 : gc_fun : join : xs))
232 let [words] = args_stix
233 in (\xs -> assign_hp words : cjmp_hp :
234 assts (hp_alloc words : gc_noregs : join : xs))
237 let [words] = args_stix
238 in (\xs -> assign_hp words : cjmp_hp :
239 assts (hp_alloc words : gc_unpt_r1 : join : xs))
242 let [words] = args_stix
243 in (\xs -> assign_hp words : cjmp_hp :
244 assts (hp_alloc words : gc_unbx_r1 : join : xs))
247 let [words] = args_stix
248 in (\xs -> assign_hp words : cjmp_hp :
249 assts (hp_alloc words : gc_f1 : join : xs))
252 let [words] = args_stix
253 in (\xs -> assign_hp words : cjmp_hp :
254 assts (hp_alloc words : gc_d1 : join : xs))
257 let [words] = args_stix
258 in (\xs -> assign_hp words : cjmp_hp :
259 assts (hp_alloc words : gc_l1 : join : xs))
262 let [words,liveness] = args_stix
263 in (\xs -> assign_hp words : cjmp_hp :
264 assts (hp_alloc words : assign_liveness liveness :
268 -- Various canned heap-check routines
270 mkStJump_to_GCentry_name :: String -> StixStmt
271 mkStJump_to_GCentry_name gcname
273 = StJump NoDestInfo (StCLbl (mkRtsGCEntryLabel gcname))
274 -- | otherwise -- it's in a different DLL
275 -- = StJump (StInd PtrRep (StLitLbl True sdoc))
277 mkStJump_to_RegTable_offw :: Int -> StixStmt
278 mkStJump_to_RegTable_offw regtable_offw
280 = StJump NoDestInfo (StInd PtrRep (get_Regtable_addr_from_offset regtable_offw))
282 -- do something plausible for cross-DLL jump
284 gc_enter = mkStJump_to_RegTable_offw OFFSET_stgGCEnter1
285 gc_fun = mkStJump_to_RegTable_offw OFFSET_stgGCFun
287 gc_noregs = mkStJump_to_GCentry_name "stg_gc_noregs"
288 gc_unpt_r1 = mkStJump_to_GCentry_name "stg_gc_unpt_r1"
289 gc_unbx_r1 = mkStJump_to_GCentry_name "stg_gc_unbx_r1"
290 gc_f1 = mkStJump_to_GCentry_name "stg_gc_f1"
291 gc_d1 = mkStJump_to_GCentry_name "stg_gc_d1"
292 gc_l1 = mkStJump_to_GCentry_name "stg_gc_l1"
293 gc_ut = mkStJump_to_GCentry_name "stg_gc_ut"