Differential D80264 Diff 265108 llvm/lib/IR/Instruction.cpp

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llvm/lib/IR/Instruction.cpp

Show All 37 Lines	Instruction::Instruction(Type ty, unsigned it, Use Ops, unsigned NumOps,

// append this instruction into the basic block		// append this instruction into the basic block
assert(InsertAtEnd && "Basic block to append to may not be NULL!");		assert(InsertAtEnd && "Basic block to append to may not be NULL!");
InsertAtEnd->getInstList().push_back(this);		InsertAtEnd->getInstList().push_back(this);
}		}

Instruction::~Instruction() {		Instruction::~Instruction() {
assert(!Parent && "Instruction still linked in the program!");		assert(!Parent && "Instruction still linked in the program!");

		// Replace any extant metadata uses of this instruction with undef to
		// preserve debug info accuracy. Some alternatives include:
		// - Treat Instruction like any other Value, and point its extant metadata
		// uses to an empty ValueAsMetadata node. This makes extant dbg.value uses
		// trivially dead (i.e. fair game for deletion in many passes), leading to
		// stale dbg.values being in effect for too long.
		// - Call salvageDebugInfoOrMarkUndef. Not needed to make instruction removal
		// correct. OTOH results in wasted work in some common cases (e.g. when all
		// instructions in a BasicBlock are deleted).
		if (isUsedByMetadata())
		ValueAsMetadata::handleRAUW(this, UndefValue::get(getType()));

if (hasMetadataHashEntry())		if (hasMetadataHashEntry())
clearMetadataHashEntries();		clearMetadataHashEntries();
}		}


void Instruction::setParent(BasicBlock *P) {		void Instruction::setParent(BasicBlock *P) {
Parent = P;		Parent = P;
}		}
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