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commit 6aa4f7e7e76b40c183fb29650540d119ce1b4a4a
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Author: Julian Seward <jseward@acm.org>
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Date: Thu Jun 11 09:01:52 2020 +0200
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expr_is_guardable, stmt_is_guardable, add_guarded_stmt_to_end_of: handle GetI/PutI cases.
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This fixes #422715.
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diff --git a/VEX/priv/guest_generic_bb_to_IR.c b/VEX/priv/guest_generic_bb_to_IR.c
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index 2f204c5b0..0cee970e4 100644
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--- a/VEX/priv/guest_generic_bb_to_IR.c
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+++ b/VEX/priv/guest_generic_bb_to_IR.c
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@@ -425,6 +425,7 @@ static Bool expr_is_guardable ( const IRExpr* e )
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case Iex_ITE:
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case Iex_CCall:
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case Iex_Get:
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+ case Iex_GetI:
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case Iex_Const:
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case Iex_RdTmp:
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return True;
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@@ -450,6 +451,7 @@ static Bool stmt_is_guardable ( const IRStmt* st )
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case Ist_NoOp:
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case Ist_IMark:
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case Ist_Put:
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+ case Ist_PutI:
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return True;
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// These are definitely not guardable, or at least it's way too much
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// hassle to do so.
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@@ -506,7 +508,7 @@ static void add_guarded_stmt_to_end_of ( /*MOD*/IRSB* bb,
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// Put(offs, e) ==> Put(offs, ITE(guard, e, Get(offs, sizeof(e))))
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// Which when flattened out is:
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// t1 = Get(offs, sizeof(e))
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- // t2 = ITE(guard, e, t2)
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+ // t2 = ITE(guard, e, t1)
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// Put(offs, t2)
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Int offset = st->Ist.Put.offset;
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IRExpr* e = st->Ist.Put.data;
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@@ -519,6 +521,26 @@ static void add_guarded_stmt_to_end_of ( /*MOD*/IRSB* bb,
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addStmtToIRSB(bb, IRStmt_Put(offset, IRExpr_RdTmp(t2)));
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break;
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}
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+ case Ist_PutI: {
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+ // PutI(descr,ix,bias, e) ==> Put(descr,ix,bias, ITE(guard, e, GetI(descr,ix,bias)))
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+ // Which when flattened out is:
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+ // t1 = GetI(descr,ix,bias)
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+ // t2 = ITE(guard, e, t1)
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+ // PutI(descr,ix,bias, t2)
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+ IRPutI* details = st->Ist.PutI.details;
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+ IRRegArray* descr = details->descr;
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+ IRExpr* ix = details->ix;
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+ Int bias = details->bias;
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+ IRExpr* e = details->data;
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+ IRType ty = typeOfIRExpr(bb->tyenv, e);
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+ IRTemp t1 = newIRTemp(bb->tyenv, ty);
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+ IRTemp t2 = newIRTemp(bb->tyenv, ty);
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+ addStmtToIRSB(bb, IRStmt_WrTmp(t1, IRExpr_GetI(descr,ix,bias)));
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+ addStmtToIRSB(bb, IRStmt_WrTmp(t2, IRExpr_ITE(IRExpr_RdTmp(guard),
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+ e, IRExpr_RdTmp(t1))));
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+ addStmtToIRSB(bb, IRStmt_PutI(mkIRPutI(descr,ix,bias, IRExpr_RdTmp(t2))));
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+ break;
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+ }
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case Ist_Exit: {
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// Exit(xguard, dst, jk, offsIP)
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// ==> t1 = And1(xguard, guard)
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