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[sil] Add a forwarding cast called unchecked_value_cast.

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Today unchecked_bitwise_cast returns a value with ObjCUnowned ownership. This is
important to do since the instruction can truncate memory meaning we want to
treat it as a new object that must be copied before use.

This means that in OSSA we do not have a purely ossa forwarding unchecked
layout-compatible assuming cast. This role is filled by unchecked_value_cast.
This commit is contained in:
Michael Gottesman
2020-07-07 18:07:47 -07:00
parent d1a54a5301
commit 5e36ae1c7c
22 changed files with 132 additions and 1 deletions
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15
lib/SIL/IR/SILInstructions.cpp
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@@ -2217,6 +2217,21 @@ UncheckedRefCastInst::create(SILDebugLocation DebugLoc, SILValue Operand,
TypeDependentOperands, Ty);
}
UncheckedValueCastInst *
UncheckedValueCastInst::create(SILDebugLocation DebugLoc, SILValue Operand,
SILType Ty, SILFunction &F,
SILOpenedArchetypesState &OpenedArchetypes) {
SILModule &Mod = F.getModule();
SmallVector<SILValue, 8> TypeDependentOperands;
collectTypeDependentOperands(TypeDependentOperands, OpenedArchetypes, F,
Ty.getASTType());
unsigned size =
totalSizeToAlloc<swift::Operand>(1 + TypeDependentOperands.size());
void *Buffer = Mod.allocateInst(size, alignof(UncheckedValueCastInst));
return ::new (Buffer)
UncheckedValueCastInst(DebugLoc, Operand, TypeDependentOperands, Ty);
}
UncheckedAddrCastInst *
UncheckedAddrCastInst::create(SILDebugLocation DebugLoc, SILValue Operand,
SILType Ty, SILFunction &F,