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uselistorder: Thread bit through ValueEnumerator

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Canonicalize access to whether to preserve use-list order in bitcode on
a `bool` stored in `ValueEnumerator`.  Next step, expose this as a
`bool` through `WriteBitcodeToFile()`.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234956 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith 2015-04-14 23:45:11 +00:00
parent 83ed6b7814
commit d01ee74ffa
3 changed files with 16 additions and 8 deletions
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9
lib/Bitcode/Writer/BitcodeWriter.cpp
View File

@ -2047,6 +2047,9 @@ static void WriteUseList(ValueEnumerator &VE, UseListOrder &&Order,
static void WriteUseListBlock(const Function *F, ValueEnumerator &VE,
BitstreamWriter &Stream) {
assert(VE.shouldPreserveUseListOrder() &&
"Expected to be preserving use-list order");
auto hasMore = [&]() {
return !VE.UseListOrders.empty() && VE.UseListOrders.back().F == F;
};
@ -2127,7 +2130,7 @@ static void WriteFunction(const Function &F, ValueEnumerator &VE,
if (NeedsMetadataAttachment)
WriteMetadataAttachment(F, VE, Stream);
if (shouldPreserveBitcodeUseListOrder())
if (VE.shouldPreserveUseListOrder())
WriteUseListBlock(&F, VE, Stream);
VE.purgeFunction();
Stream.ExitBlock();
@ -2318,7 +2321,7 @@ static void WriteModule(const Module *M, BitstreamWriter &Stream) {
Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
// Analyze the module, enumerating globals, functions, etc.
ValueEnumerator VE(*M);
ValueEnumerator VE(*M, shouldPreserveBitcodeUseListOrder());
// Emit blockinfo, which defines the standard abbreviations etc.
WriteBlockInfo(VE, Stream);
@ -2351,7 +2354,7 @@ static void WriteModule(const Module *M, BitstreamWriter &Stream) {
WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
// Emit module-level use-lists.
if (shouldPreserveBitcodeUseListOrder())
if (VE.shouldPreserveUseListOrder())
WriteUseListBlock(nullptr, VE, Stream);
// Emit function bodies.

10
lib/Bitcode/Writer/ValueEnumerator.cpp
View File

@ -283,9 +283,11 @@ static bool isIntOrIntVectorValue(const std::pair<const Value*, unsigned> &V) {
return V.first->getType()->isIntOrIntVectorTy();
}
ValueEnumerator::ValueEnumerator(const Module &M)
: HasMDString(false), HasMDLocation(false), HasGenericDebugNode(false) {
if (shouldPreserveBitcodeUseListOrder())
ValueEnumerator::ValueEnumerator(const Module &M,
bool ShouldPreserveUseListOrder)
: HasMDString(false), HasMDLocation(false), HasGenericDebugNode(false),
ShouldPreserveUseListOrder(ShouldPreserveUseListOrder) {
if (ShouldPreserveUseListOrder)
UseListOrders = predictUseListOrder(M);
// Enumerate the global variables.
@ -461,7 +463,7 @@ void ValueEnumerator::print(raw_ostream &OS, const MetadataMapType &Map,
void ValueEnumerator::OptimizeConstants(unsigned CstStart, unsigned CstEnd) {
if (CstStart == CstEnd || CstStart+1 == CstEnd) return;
if (shouldPreserveBitcodeUseListOrder())
if (ShouldPreserveUseListOrder)
// Optimizing constants makes the use-list order difficult to predict.
// Disable it for now when trying to preserve the order.
return;

5
lib/Bitcode/Writer/ValueEnumerator.h
View File

@ -67,6 +67,7 @@ private:
bool HasMDString;
bool HasMDLocation;
bool HasGenericDebugNode;
bool ShouldPreserveUseListOrder;
typedef DenseMap<AttributeSet, unsigned> AttributeGroupMapType;
AttributeGroupMapType AttributeGroupMap;
@ -102,7 +103,7 @@ private:
ValueEnumerator(const ValueEnumerator &) = delete;
void operator=(const ValueEnumerator &) = delete;
public:
ValueEnumerator(const Module &M);
ValueEnumerator(const Module &M, bool ShouldPreserveUseListOrder);
void dump() const;
void print(raw_ostream &OS, const ValueMapType &Map, const char *Name) const;
@ -123,6 +124,8 @@ public:
bool hasMDLocation() const { return HasMDLocation; }
bool hasGenericDebugNode() const { return HasGenericDebugNode; }
bool shouldPreserveUseListOrder() const { return ShouldPreserveUseListOrder; }
unsigned getTypeID(Type *T) const {
TypeMapType::const_iterator I = TypeMap.find(T);
assert(I != TypeMap.end() && "Type not in ValueEnumerator!");