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Small clean-up in box-to-stack prmomotion.

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Swift SVN r15959
This commit is contained in:
Mark Lacey
2014-04-04 21:51:58 +00:00
parent 62844f58b6
commit 627534144d
1 changed files with 36 additions and 22 deletions
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50
lib/SILPasses/AllocBoxToStack.cpp
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@@ -284,18 +284,11 @@ static size_t getParameterIndexForOperand(Operand *O) {
/// Given an operand of a direct apply or partial_apply of a
/// non-generic function, return the parameter used in the body of the
/// function to represent this operand.
static SILValue getParameterForOperand(Operand *O) {
auto *FRI = getDirectCallee(O->getUser());
if (!FRI)
return SILValue();
auto *F = FRI->getReferencedFunction();
assert(F && "Expected a referenced function!");
// TODO: Support generics at some point.
if (callIsPolymorphic(O->getUser()))
return SILValue();
/// function to represent this operand. For non-direct calls and for
/// functions that we cannot examine the body of, return an empty
/// SILValue.
static SILValue getParameterForOperand(SILFunction *F, Operand *O) {
assert(F && !F->empty() && "Expected a function with a body!");
auto &Entry = F->front();
size_t ParamIndex = getParameterIndexForOperand(O);
@@ -304,16 +297,34 @@ static SILValue getParameterForOperand(Operand *O) {
return SILValue(Param);
}
/// Return a pointer to the SILFunction called by Call if we can
/// determine which funciton that is, and we have a body for that
/// function. Otherwise return nullptr.
static SILFunction *getFunctionBody(SILInstruction *Call) {
// TODO: Support generics at some point.
if (callIsPolymorphic(Call))
return nullptr;
if (auto *FRI = getDirectCallee(Call))
if (auto *F = FRI->getReferencedFunction())
if (!F->empty())
return F;
return nullptr;
}
/// Could this operand to an apply escape that function by being
/// stored or returned?
static bool operandEscapesApply(Operand *O) {
SILFunction *F = getFunctionBody(O->getUser());
// If we cannot examine the function body, assume the worst.
if (!F)
return true;
// Check the uses of the operand, but do not recurse down into other
// apply instructions.
if (auto Param = getParameterForOperand(O))
auto Param = getParameterForOperand(F, O);
return canValueEscape(Param, /* examineApply = */ false);
return true;
}
/// checkPartialApplyBody - Check the body of a partial apply to see
@@ -321,15 +332,18 @@ static bool operandEscapesApply(Operand *O) {
/// disqualify it from being protmoted to a stack location. Return
/// true if this partial apply will not block our promoting the box.
static bool checkPartialApplyBody(Operand *O) {
SILFunction *F = getFunctionBody(O->getUser());
// If we cannot examine the function body, assume the worst.
if (!F)
return false;
// We don't actually use these because we're not recursively
// rewriting the partial applies we find.
llvm::SmallVector<Operand *, 1> ElidedOperands;
if (auto Param = getParameterForOperand(O))
auto Param = getParameterForOperand(F, O);
return !findUnexpectedBoxUse(Param, /* examinePartialApply = */ false,
/* inAppliedFunction = */ true,
ElidedOperands);
return false;
}