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Merge pull request #32810 from gottesmm/pr-8065f86ba5642aaa24fc678591175d0628725f99
[gardening] Update SILLowerAggregateInstrs to be of a more modern style.
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‎lib/SILOptimizer/Transforms/SILLowerAggregateInstrs.cpp‎

Lines changed: 114 additions & 104 deletions
Original file line numberDiff line numberDiff line change
@@ -9,9 +9,12 @@
99
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
1010
//
1111
//===----------------------------------------------------------------------===//
12-
//
13-
// Simplify aggregate instructions into scalar instructions.
14-
//
12+
///
13+
/// \file
14+
///
15+
/// Simplify aggregate instructions into scalar instructions using simple
16+
/// peephole transformations.
17+
///
1518
//===----------------------------------------------------------------------===//
1619

1720
#define DEBUG_TYPE "sil-lower-aggregate-instrs"
@@ -26,6 +29,7 @@
2629
#include "swift/SILOptimizer/Utils/InstOptUtils.h"
2730
#include "llvm/ADT/Statistic.h"
2831
#include "llvm/Support/Debug.h"
32+
2933
using namespace swift;
3034
using namespace swift::Lowering;
3135

@@ -70,154 +74,156 @@ STATISTIC(NumExpand, "Number of instructions expanded");
7074
/// // no retain of %new!
7175
/// // no load/release of %old!
7276
/// store %new to %1 : $*T
73-
static bool expandCopyAddr(CopyAddrInst *CA) {
74-
SILModule &M = CA->getModule();
75-
SILFunction *F = CA->getFunction();
76-
SILValue Source = CA->getSrc();
77+
static bool expandCopyAddr(CopyAddrInst *cai) {
78+
SILFunction *fn = cai->getFunction();
79+
SILModule &module = cai->getModule();
80+
SILValue source = cai->getSrc();
7781

7882
// If we have an address only type don't do anything.
79-
SILType SrcType = Source->getType();
80-
if (SrcType.isAddressOnly(*F))
83+
SILType srcType = source->getType();
84+
if (srcType.isAddressOnly(*fn))
8185
return false;
8286

83-
bool expand = shouldExpand(M, SrcType.getObjectType());
87+
bool expand = shouldExpand(module, srcType.getObjectType());
8488
using TypeExpansionKind = Lowering::TypeLowering::TypeExpansionKind;
8589
auto expansionKind = expand ? TypeExpansionKind::MostDerivedDescendents
8690
: TypeExpansionKind::None;
8791

88-
SILBuilderWithScope Builder(CA);
92+
SILBuilderWithScope builder(cai);
8993

9094
// %new = load %0 : $*T
91-
LoadInst *New = Builder.createLoad(CA->getLoc(), Source,
92-
LoadOwnershipQualifier::Unqualified);
95+
LoadInst *newValue = builder.createLoad(cai->getLoc(), source,
96+
LoadOwnershipQualifier::Unqualified);
9397

94-
SILValue Destination = CA->getDest();
98+
SILValue destAddr = cai->getDest();
9599

96100
// If our object type is not trivial, we may need to release the old value and
97101
// retain the new one.
98102

99-
auto &TL = F->getTypeLowering(SrcType);
103+
auto &typeLowering = fn->getTypeLowering(srcType);
100104

101105
// If we have a non-trivial type...
102-
if (!TL.isTrivial()) {
103-
106+
if (!typeLowering.isTrivial()) {
104107
// If we are not initializing:
105108
// %old = load %1 : $*T
106-
IsInitialization_t IsInit = CA->isInitializationOfDest();
107-
LoadInst *Old = nullptr;
108-
if (IsInitialization_t::IsNotInitialization == IsInit) {
109-
Old = Builder.createLoad(CA->getLoc(), Destination,
110-
LoadOwnershipQualifier::Unqualified);
109+
auto isInit = cai->isInitializationOfDest();
110+
LoadInst *oldValue = nullptr;
111+
if (IsInitialization_t::IsNotInitialization == isInit) {
112+
oldValue = builder.createLoad(cai->getLoc(), destAddr,
113+
LoadOwnershipQualifier::Unqualified);
111114
}
112115

113116
// If we are not taking and have a reference type:
114117
// strong_retain %new : $*T
115118
// or if we have a non-trivial non-reference type.
116119
// retain_value %new : $*T
117-
IsTake_t IsTake = CA->isTakeOfSrc();
118-
if (IsTake_t::IsNotTake == IsTake) {
119-
TL.emitLoweredCopyValue(Builder, CA->getLoc(), New, expansionKind);
120+
if (IsTake_t::IsNotTake == cai->isTakeOfSrc()) {
121+
typeLowering.emitLoweredCopyValue(builder, cai->getLoc(), newValue,
122+
expansionKind);
120123
}
121124

122125
// If we are not initializing:
123126
// strong_release %old : $*T
124127
// *or*
125128
// release_value %old : $*T
126-
if (Old) {
127-
TL.emitLoweredDestroyValue(Builder, CA->getLoc(), Old, expansionKind);
129+
if (oldValue) {
130+
typeLowering.emitLoweredDestroyValue(builder, cai->getLoc(), oldValue,
131+
expansionKind);
128132
}
129133
}
130134

131135
// Create the store.
132-
Builder.createStore(CA->getLoc(), New, Destination,
136+
builder.createStore(cai->getLoc(), newValue, destAddr,
133137
StoreOwnershipQualifier::Unqualified);
134138

135139
++NumExpand;
136140
return true;
137141
}
138142

139-
static bool expandDestroyAddr(DestroyAddrInst *DA) {
140-
SILFunction *F = DA->getFunction();
141-
SILModule &Module = DA->getModule();
142-
SILBuilderWithScope Builder(DA);
143+
static bool expandDestroyAddr(DestroyAddrInst *dai) {
144+
SILFunction *fn = dai->getFunction();
145+
SILModule &module = dai->getModule();
146+
SILBuilderWithScope builder(dai);
143147

144148
// Strength reduce destroy_addr inst into release/store if
145149
// we have a non-address only type.
146-
SILValue Addr = DA->getOperand();
150+
SILValue addr = dai->getOperand();
147151

148152
// If we have an address only type, do nothing.
149-
SILType Type = Addr->getType();
150-
if (Type.isAddressOnly(*F))
153+
SILType type = addr->getType();
154+
if (type.isAddressOnly(*fn))
151155
return false;
152156

153-
bool expand = shouldExpand(Module, Type.getObjectType());
157+
bool expand = shouldExpand(module, type.getObjectType());
154158

155159
// If we have a non-trivial type...
156-
if (!Type.isTrivial(*F)) {
160+
if (!type.isTrivial(*fn)) {
157161
// If we have a type with reference semantics, emit a load/strong release.
158-
LoadInst *LI = Builder.createLoad(DA->getLoc(), Addr,
162+
LoadInst *li = builder.createLoad(dai->getLoc(), addr,
159163
LoadOwnershipQualifier::Unqualified);
160-
auto &TL = F->getTypeLowering(Type);
164+
auto &typeLowering = fn->getTypeLowering(type);
161165
using TypeExpansionKind = Lowering::TypeLowering::TypeExpansionKind;
162166
auto expansionKind = expand ? TypeExpansionKind::MostDerivedDescendents
163167
: TypeExpansionKind::None;
164-
TL.emitLoweredDestroyValue(Builder, DA->getLoc(), LI, expansionKind);
168+
typeLowering.emitLoweredDestroyValue(builder, dai->getLoc(), li,
169+
expansionKind);
165170
}
166171

167172
++NumExpand;
168173
return true;
169174
}
170175

171-
static bool expandReleaseValue(ReleaseValueInst *DV) {
172-
SILFunction *F = DV->getFunction();
173-
SILModule &Module = DV->getModule();
174-
SILBuilderWithScope Builder(DV);
176+
static bool expandReleaseValue(ReleaseValueInst *rvi) {
177+
SILFunction *fn = rvi->getFunction();
178+
SILModule &module = rvi->getModule();
179+
SILBuilderWithScope builder(rvi);
175180

176181
// Strength reduce destroy_addr inst into release/store if
177182
// we have a non-address only type.
178-
SILValue Value = DV->getOperand();
183+
SILValue value = rvi->getOperand();
179184

180185
// If we have an address only type, do nothing.
181-
SILType Type = Value->getType();
182-
assert(!SILModuleConventions(Module).useLoweredAddresses()
183-
|| Type.isLoadable(*F) &&
184-
"release_value should never be called on a non-loadable type.");
186+
SILType type = value->getType();
187+
assert(!SILModuleConventions(module).useLoweredAddresses() ||
188+
type.isLoadable(*fn) &&
189+
"release_value should never be called on a non-loadable type.");
185190

186-
if (!shouldExpand(Module, Type.getObjectType()))
191+
if (!shouldExpand(module, type.getObjectType()))
187192
return false;
188193

189-
auto &TL = F->getTypeLowering(Type);
190-
TL.emitLoweredDestroyValueMostDerivedDescendents(Builder, DV->getLoc(),
191-
Value);
194+
auto &TL = fn->getTypeLowering(type);
195+
TL.emitLoweredDestroyValueMostDerivedDescendents(builder, rvi->getLoc(),
196+
value);
192197

193-
LLVM_DEBUG(llvm::dbgs() << " Expanding Destroy Value: " << *DV);
198+
LLVM_DEBUG(llvm::dbgs() << " Expanding: " << *rvi);
194199

195200
++NumExpand;
196201
return true;
197202
}
198203

199-
static bool expandRetainValue(RetainValueInst *CV) {
200-
SILFunction *F = CV->getFunction();
201-
SILModule &Module = CV->getModule();
202-
SILBuilderWithScope Builder(CV);
204+
static bool expandRetainValue(RetainValueInst *rvi) {
205+
SILFunction *fn = rvi->getFunction();
206+
SILModule &module = rvi->getModule();
207+
SILBuilderWithScope builder(rvi);
203208

204209
// Strength reduce destroy_addr inst into release/store if
205210
// we have a non-address only type.
206-
SILValue Value = CV->getOperand();
211+
SILValue value = rvi->getOperand();
207212

208213
// If we have an address only type, do nothing.
209-
SILType Type = Value->getType();
210-
assert(!SILModuleConventions(Module).useLoweredAddresses()
211-
|| Type.isLoadable(*F) &&
212-
"Copy Value can only be called on loadable types.");
214+
SILType type = value->getType();
215+
assert(!SILModuleConventions(module).useLoweredAddresses() ||
216+
type.isLoadable(*fn) &&
217+
"Copy Value can only be called on loadable types.");
213218

214-
if (!shouldExpand(Module, Type.getObjectType()))
219+
if (!shouldExpand(module, type.getObjectType()))
215220
return false;
216221

217-
auto &TL = F->getTypeLowering(Type);
218-
TL.emitLoweredCopyValueMostDerivedDescendents(Builder, CV->getLoc(), Value);
222+
auto &typeLowering = fn->getTypeLowering(type);
223+
typeLowering.emitLoweredCopyValueMostDerivedDescendents(builder,
224+
rvi->getLoc(), value);
219225

220-
LLVM_DEBUG(llvm::dbgs() << " Expanding Copy Value: " << *CV);
226+
LLVM_DEBUG(llvm::dbgs() << " Expanding: " << *rvi);
221227

222228
++NumExpand;
223229
return true;
@@ -227,73 +233,77 @@ static bool expandRetainValue(RetainValueInst *CV) {
227233
// Top Level Driver
228234
//===----------------------------------------------------------------------===//
229235

230-
static bool processFunction(SILFunction &Fn) {
231-
bool Changed = false;
232-
for (auto BI = Fn.begin(), BE = Fn.end(); BI != BE; ++BI) {
233-
auto II = BI->begin(), IE = BI->end();
234-
while (II != IE) {
235-
SILInstruction *Inst = &*II;
236+
static bool processFunction(SILFunction &fn) {
237+
bool changed = false;
238+
for (auto &block : fn) {
239+
auto ii = block.begin(), ie = block.end();
240+
while (ii != ie) {
241+
SILInstruction *inst = &*ii;
236242

237-
LLVM_DEBUG(llvm::dbgs() << "Visiting: " << *Inst);
243+
LLVM_DEBUG(llvm::dbgs() << "Visiting: " << *inst);
238244

239-
if (auto *CA = dyn_cast<CopyAddrInst>(Inst))
240-
if (expandCopyAddr(CA)) {
241-
++II;
242-
CA->eraseFromParent();
243-
Changed = true;
245+
if (auto *cai = dyn_cast<CopyAddrInst>(inst))
246+
if (expandCopyAddr(cai)) {
247+
++ii;
248+
cai->eraseFromParent();
249+
changed = true;
244250
continue;
245251
}
246252

247-
if (auto *DA = dyn_cast<DestroyAddrInst>(Inst))
248-
if (expandDestroyAddr(DA)) {
249-
++II;
250-
DA->eraseFromParent();
251-
Changed = true;
253+
if (auto *dai = dyn_cast<DestroyAddrInst>(inst))
254+
if (expandDestroyAddr(dai)) {
255+
++ii;
256+
dai->eraseFromParent();
257+
changed = true;
252258
continue;
253259
}
254260

255-
if (auto *CV = dyn_cast<RetainValueInst>(Inst))
256-
if (expandRetainValue(CV)) {
257-
++II;
258-
CV->eraseFromParent();
259-
Changed = true;
261+
if (auto *rvi = dyn_cast<RetainValueInst>(inst))
262+
if (expandRetainValue(rvi)) {
263+
++ii;
264+
rvi->eraseFromParent();
265+
changed = true;
260266
continue;
261267
}
262268

263-
if (auto *DV = dyn_cast<ReleaseValueInst>(Inst))
264-
if (expandReleaseValue(DV)) {
265-
++II;
266-
DV->eraseFromParent();
267-
Changed = true;
269+
if (auto *rvi = dyn_cast<ReleaseValueInst>(inst))
270+
if (expandReleaseValue(rvi)) {
271+
++ii;
272+
rvi->eraseFromParent();
273+
changed = true;
268274
continue;
269275
}
270276

271-
++II;
277+
++ii;
272278
}
273279
}
274-
return Changed;
280+
return changed;
275281
}
276282

283+
//===----------------------------------------------------------------------===//
284+
// Top Level Entrypoint
285+
//===----------------------------------------------------------------------===//
286+
277287
namespace {
288+
278289
class SILLowerAggregate : public SILFunctionTransform {
279290

280291
/// The entry point to the transformation.
281292
void run() override {
282-
SILFunction *F = getFunction();
293+
SILFunction *f = getFunction();
283294
// FIXME: Can we support ownership?
284-
if (F->hasOwnership())
295+
if (f->hasOwnership())
285296
return;
286-
LLVM_DEBUG(llvm::dbgs() << "***** LowerAggregate on function: " <<
287-
F->getName() << " *****\n");
288-
bool Changed = processFunction(*F);
289-
if (Changed) {
297+
LLVM_DEBUG(llvm::dbgs() << "***** LowerAggregate on function: "
298+
<< f->getName() << " *****\n");
299+
bool changed = processFunction(*f);
300+
if (changed) {
290301
invalidateAnalysis(SILAnalysis::InvalidationKind::CallsAndInstructions);
291302
}
292303
}
293-
294304
};
295-
} // end anonymous namespace
296305

306+
} // end anonymous namespace
297307

298308
SILTransform *swift::createLowerAggregateInstrs() {
299309
return new SILLowerAggregate();

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