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Make SILInstruction no longer a subclass of ValueBase and

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introduce a common superclass, SILNode.

This is in preparation for allowing instructions to have multiple
results.  It is also a somewhat more elegant representation for
instructions that have zero results.  Instructions that are known
to have exactly one result inherit from a class, SingleValueInstruction,
that subclasses both ValueBase and SILInstruction.  Some care must be
taken when working with SILNode pointers and testing for equality;
please see the comment on SILNode for more information.

A number of SIL passes needed to be updated in order to handle this
new distinction between SIL values and SIL instructions.

Note that the SIL parser is now stricter about not trying to assign
a result value from an instruction (like 'return' or 'strong_retain')
that does not produce any.
This commit is contained in:
John McCall
2017-09-21 00:17:10 -07:00
parent 6d9294f565
commit ab3f77baf2
195 changed files with 6114 additions and 4985 deletions
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34
lib/SILOptimizer/Transforms/Sink.cpp
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@@ -73,25 +73,27 @@ public:
// TODO: We may want to delete debug instructions to allow us to sink more
// instructions.
for (auto *Operand : II->getUses()) {
SILInstruction *User = Operand->getUser();
for (auto result : II->getResults()) {
for (auto *Operand : result->getUses()) {
SILInstruction *User = Operand->getUser();
// Check if the instruction is already in the user's block.
if (User->getParent() == CurrentBlock) return false;
// Check if the instruction is already in the user's block.
if (User->getParent() == CurrentBlock) return false;
// Record the block of the first user and move on to
// other users.
if (!Dest) {
Dest = User->getParent();
continue;
// Record the block of the first user and move on to
// other users.
if (!Dest) {
Dest = User->getParent();
continue;
}
// Find a location that dominates all users. If we did not find such
// a block or if it is the current block then bail out.
Dest = DT->findNearestCommonDominator(Dest, User->getParent());
if (!Dest || Dest == CurrentBlock)
return false;
}
// Find a location that dominates all users. If we did not find such
// a block or if it is the current block then bail out.
Dest = DT->findNearestCommonDominator(Dest, User->getParent());
if (!Dest || Dest == CurrentBlock)
return false;
}
if (!Dest) return false;