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-rw-r--r--lib/Bitcode/Writer/BitWriter.cpp14
-rw-r--r--lib/Bitcode/Writer/BitcodeWriter.cpp174
-rw-r--r--lib/Bitcode/Writer/ValueEnumerator.cpp333
-rw-r--r--lib/Bitcode/Writer/ValueEnumerator.h16
4 files changed, 373 insertions, 164 deletions
diff --git a/lib/Bitcode/Writer/BitWriter.cpp b/lib/Bitcode/Writer/BitWriter.cpp
index 3747122..7218ea0 100644
--- a/lib/Bitcode/Writer/BitWriter.cpp
+++ b/lib/Bitcode/Writer/BitWriter.cpp
@@ -18,10 +18,10 @@ using namespace llvm;
/*===-- Operations on modules ---------------------------------------------===*/
int LLVMWriteBitcodeToFile(LLVMModuleRef M, const char *Path) {
- std::string ErrorInfo;
- raw_fd_ostream OS(Path, ErrorInfo, sys::fs::F_None);
+ std::error_code EC;
+ raw_fd_ostream OS(Path, EC, sys::fs::F_None);
- if (!ErrorInfo.empty())
+ if (EC)
return -1;
WriteBitcodeToFile(unwrap(M), OS);
@@ -39,3 +39,11 @@ int LLVMWriteBitcodeToFD(LLVMModuleRef M, int FD, int ShouldClose,
int LLVMWriteBitcodeToFileHandle(LLVMModuleRef M, int FileHandle) {
return LLVMWriteBitcodeToFD(M, FileHandle, true, false);
}
+
+LLVMMemoryBufferRef LLVMWriteBitcodeToMemoryBuffer(LLVMModuleRef M) {
+ std::string Data;
+ raw_string_ostream OS(Data);
+
+ WriteBitcodeToFile(unwrap(M), OS);
+ return wrap(MemoryBuffer::getMemBufferCopy(OS.str()).release());
+}
diff --git a/lib/Bitcode/Writer/BitcodeWriter.cpp b/lib/Bitcode/Writer/BitcodeWriter.cpp
index dd9282a..6cfc357 100644
--- a/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -22,6 +22,7 @@
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Operator.h"
+#include "llvm/IR/UseListOrder.h"
#include "llvm/IR/ValueSymbolTable.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
@@ -32,12 +33,6 @@
#include <map>
using namespace llvm;
-static cl::opt<bool>
-EnablePreserveUseListOrdering("enable-bc-uselist-preserve",
- cl::desc("Turn on experimental support for "
- "use-list order preservation."),
- cl::init(false), cl::Hidden);
-
/// These are manifest constants used by the bitcode writer. They do not need to
/// be kept in sync with the reader, but need to be consistent within this file.
enum {
@@ -201,6 +196,8 @@ static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
return bitc::ATTR_KIND_NON_LAZY_BIND;
case Attribute::NonNull:
return bitc::ATTR_KIND_NON_NULL;
+ case Attribute::Dereferenceable:
+ return bitc::ATTR_KIND_DEREFERENCEABLE;
case Attribute::NoRedZone:
return bitc::ATTR_KIND_NO_RED_ZONE;
case Attribute::NoReturn:
@@ -272,7 +269,7 @@ static void WriteAttributeGroupTable(const ValueEnumerator &VE,
if (Attr.isEnumAttribute()) {
Record.push_back(0);
Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
- } else if (Attr.isAlignAttribute()) {
+ } else if (Attr.isIntAttribute()) {
Record.push_back(1);
Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
Record.push_back(Attr.getValueAsInt());
@@ -713,18 +710,15 @@ static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
static uint64_t GetOptimizationFlags(const Value *V) {
uint64_t Flags = 0;
- if (const OverflowingBinaryOperator *OBO =
- dyn_cast<OverflowingBinaryOperator>(V)) {
+ if (const auto *OBO = dyn_cast<OverflowingBinaryOperator>(V)) {
if (OBO->hasNoSignedWrap())
Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP;
if (OBO->hasNoUnsignedWrap())
Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP;
- } else if (const PossiblyExactOperator *PEO =
- dyn_cast<PossiblyExactOperator>(V)) {
+ } else if (const auto *PEO = dyn_cast<PossiblyExactOperator>(V)) {
if (PEO->isExact())
Flags |= 1 << bitc::PEO_EXACT;
- } else if (const FPMathOperator *FPMO =
- dyn_cast<const FPMathOperator>(V)) {
+ } else if (const auto *FPMO = dyn_cast<FPMathOperator>(V)) {
if (FPMO->hasUnsafeAlgebra())
Flags |= FastMathFlags::UnsafeAlgebra;
if (FPMO->hasNoNaNs())
@@ -762,13 +756,13 @@ static void WriteMDNode(const MDNode *N,
static void WriteModuleMetadata(const Module *M,
const ValueEnumerator &VE,
BitstreamWriter &Stream) {
- const ValueEnumerator::ValueList &Vals = VE.getMDValues();
+ const auto &Vals = VE.getMDValues();
bool StartedMetadataBlock = false;
unsigned MDSAbbrev = 0;
SmallVector<uint64_t, 64> Record;
for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
- if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) {
+ if (const MDNode *N = dyn_cast<MDNode>(Vals[i])) {
if (!N->isFunctionLocal() || !N->getFunction()) {
if (!StartedMetadataBlock) {
Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
@@ -776,7 +770,7 @@ static void WriteModuleMetadata(const Module *M,
}
WriteMDNode(N, VE, Stream, Record);
}
- } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) {
+ } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i])) {
if (!StartedMetadataBlock) {
Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
@@ -854,7 +848,7 @@ static void WriteMetadataAttachment(const Function &F,
// Write metadata attachments
// METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]]
- SmallVector<std::pair<unsigned, MDNode*>, 4> MDs;
+ SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
@@ -1431,13 +1425,20 @@ static void WriteInstruction(const Instruction &I, unsigned InstID,
break;
}
- case Instruction::Alloca:
+ case Instruction::Alloca: {
Code = bitc::FUNC_CODE_INST_ALLOCA;
Vals.push_back(VE.getTypeID(I.getType()));
Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
- Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1);
+ const AllocaInst &AI = cast<AllocaInst>(I);
+ unsigned AlignRecord = Log2_32(AI.getAlignment()) + 1;
+ assert(Log2_32(Value::MaximumAlignment) + 1 < 1 << 5 &&
+ "not enough bits for maximum alignment");
+ assert(AlignRecord < 1 << 5 && "alignment greater than 1 << 64");
+ AlignRecord |= AI.isUsedWithInAlloca() << 5;
+ Vals.push_back(AlignRecord);
break;
+ }
case Instruction::Load:
if (cast<LoadInst>(I).isAtomic()) {
@@ -1598,6 +1599,39 @@ static void WriteValueSymbolTable(const ValueSymbolTable &VST,
Stream.ExitBlock();
}
+static void WriteUseList(ValueEnumerator &VE, UseListOrder &&Order,
+ BitstreamWriter &Stream) {
+ assert(Order.Shuffle.size() >= 2 && "Shuffle too small");
+ unsigned Code;
+ if (isa<BasicBlock>(Order.V))
+ Code = bitc::USELIST_CODE_BB;
+ else
+ Code = bitc::USELIST_CODE_DEFAULT;
+
+ SmallVector<uint64_t, 64> Record;
+ for (unsigned I : Order.Shuffle)
+ Record.push_back(I);
+ Record.push_back(VE.getValueID(Order.V));
+ Stream.EmitRecord(Code, Record);
+}
+
+static void WriteUseListBlock(const Function *F, ValueEnumerator &VE,
+ BitstreamWriter &Stream) {
+ auto hasMore = [&]() {
+ return !VE.UseListOrders.empty() && VE.UseListOrders.back().F == F;
+ };
+ if (!hasMore())
+ // Nothing to do.
+ return;
+
+ Stream.EnterSubblock(bitc::USELIST_BLOCK_ID, 3);
+ while (hasMore()) {
+ WriteUseList(VE, std::move(VE.UseListOrders.back()), Stream);
+ VE.UseListOrders.pop_back();
+ }
+ Stream.ExitBlock();
+}
+
/// WriteFunction - Emit a function body to the module stream.
static void WriteFunction(const Function &F, ValueEnumerator &VE,
BitstreamWriter &Stream) {
@@ -1666,6 +1700,8 @@ static void WriteFunction(const Function &F, ValueEnumerator &VE,
if (NeedsMetadataAttachment)
WriteMetadataAttachment(F, VE, Stream);
+ if (shouldPreserveBitcodeUseListOrder())
+ WriteUseListBlock(&F, VE, Stream);
VE.purgeFunction();
Stream.ExitBlock();
}
@@ -1831,98 +1867,6 @@ static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
Stream.ExitBlock();
}
-// Sort the Users based on the order in which the reader parses the bitcode
-// file.
-static bool bitcodereader_order(const User *lhs, const User *rhs) {
- // TODO: Implement.
- return true;
-}
-
-static void WriteUseList(const Value *V, const ValueEnumerator &VE,
- BitstreamWriter &Stream) {
-
- // One or zero uses can't get out of order.
- if (V->use_empty() || V->hasNUses(1))
- return;
-
- // Make a copy of the in-memory use-list for sorting.
- SmallVector<const User*, 8> UserList(V->user_begin(), V->user_end());
-
- // Sort the copy based on the order read by the BitcodeReader.
- std::sort(UserList.begin(), UserList.end(), bitcodereader_order);
-
- // TODO: Generate a diff between the BitcodeWriter in-memory use-list and the
- // sorted list (i.e., the expected BitcodeReader in-memory use-list).
-
- // TODO: Emit the USELIST_CODE_ENTRYs.
-}
-
-static void WriteFunctionUseList(const Function *F, ValueEnumerator &VE,
- BitstreamWriter &Stream) {
- VE.incorporateFunction(*F);
-
- for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
- AI != AE; ++AI)
- WriteUseList(AI, VE, Stream);
- for (Function::const_iterator BB = F->begin(), FE = F->end(); BB != FE;
- ++BB) {
- WriteUseList(BB, VE, Stream);
- for (BasicBlock::const_iterator II = BB->begin(), IE = BB->end(); II != IE;
- ++II) {
- WriteUseList(II, VE, Stream);
- for (User::const_op_iterator OI = II->op_begin(), E = II->op_end();
- OI != E; ++OI) {
- if ((isa<Constant>(*OI) && !isa<GlobalValue>(*OI)) ||
- isa<InlineAsm>(*OI))
- WriteUseList(*OI, VE, Stream);
- }
- }
- }
- VE.purgeFunction();
-}
-
-// Emit use-lists.
-static void WriteModuleUseLists(const Module *M, ValueEnumerator &VE,
- BitstreamWriter &Stream) {
- Stream.EnterSubblock(bitc::USELIST_BLOCK_ID, 3);
-
- // XXX: this modifies the module, but in a way that should never change the
- // behavior of any pass or codegen in LLVM. The problem is that GVs may
- // contain entries in the use_list that do not exist in the Module and are
- // not stored in the .bc file.
- for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
- I != E; ++I)
- I->removeDeadConstantUsers();
-
- // Write the global variables.
- for (Module::const_global_iterator GI = M->global_begin(),
- GE = M->global_end(); GI != GE; ++GI) {
- WriteUseList(GI, VE, Stream);
-
- // Write the global variable initializers.
- if (GI->hasInitializer())
- WriteUseList(GI->getInitializer(), VE, Stream);
- }
-
- // Write the functions.
- for (Module::const_iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI) {
- WriteUseList(FI, VE, Stream);
- if (!FI->isDeclaration())
- WriteFunctionUseList(FI, VE, Stream);
- if (FI->hasPrefixData())
- WriteUseList(FI->getPrefixData(), VE, Stream);
- }
-
- // Write the aliases.
- for (Module::const_alias_iterator AI = M->alias_begin(), AE = M->alias_end();
- AI != AE; ++AI) {
- WriteUseList(AI, VE, Stream);
- WriteUseList(AI->getAliasee(), VE, Stream);
- }
-
- Stream.ExitBlock();
-}
-
/// WriteModule - Emit the specified module to the bitstream.
static void WriteModule(const Module *M, BitstreamWriter &Stream) {
Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
@@ -1933,7 +1877,7 @@ 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);
// Emit blockinfo, which defines the standard abbreviations etc.
WriteBlockInfo(VE, Stream);
@@ -1965,9 +1909,9 @@ static void WriteModule(const Module *M, BitstreamWriter &Stream) {
// Emit names for globals/functions etc.
WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
- // Emit use-lists.
- if (EnablePreserveUseListOrdering)
- WriteModuleUseLists(M, VE, Stream);
+ // Emit module-level use-lists.
+ if (shouldPreserveBitcodeUseListOrder())
+ WriteUseListBlock(nullptr, VE, Stream);
// Emit function bodies.
for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F)
diff --git a/lib/Bitcode/Writer/ValueEnumerator.cpp b/lib/Bitcode/Writer/ValueEnumerator.cpp
index 15f8034..f065c83 100644
--- a/lib/Bitcode/Writer/ValueEnumerator.cpp
+++ b/lib/Bitcode/Writer/ValueEnumerator.cpp
@@ -18,31 +18,280 @@
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
+#include "llvm/IR/UseListOrder.h"
#include "llvm/IR/ValueSymbolTable.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
using namespace llvm;
+namespace {
+struct OrderMap {
+ DenseMap<const Value *, std::pair<unsigned, bool>> IDs;
+ unsigned LastGlobalConstantID;
+ unsigned LastGlobalValueID;
+
+ OrderMap() : LastGlobalConstantID(0), LastGlobalValueID(0) {}
+
+ bool isGlobalConstant(unsigned ID) const {
+ return ID <= LastGlobalConstantID;
+ }
+ bool isGlobalValue(unsigned ID) const {
+ return ID <= LastGlobalValueID && !isGlobalConstant(ID);
+ }
+
+ unsigned size() const { return IDs.size(); }
+ std::pair<unsigned, bool> &operator[](const Value *V) { return IDs[V]; }
+ std::pair<unsigned, bool> lookup(const Value *V) const {
+ return IDs.lookup(V);
+ }
+ void index(const Value *V) {
+ // Explicitly sequence get-size and insert-value operations to avoid UB.
+ unsigned ID = IDs.size() + 1;
+ IDs[V].first = ID;
+ }
+};
+}
+
+static void orderValue(const Value *V, OrderMap &OM) {
+ if (OM.lookup(V).first)
+ return;
+
+ if (const Constant *C = dyn_cast<Constant>(V))
+ if (C->getNumOperands() && !isa<GlobalValue>(C))
+ for (const Value *Op : C->operands())
+ if (!isa<BasicBlock>(Op) && !isa<GlobalValue>(Op))
+ orderValue(Op, OM);
+
+ // Note: we cannot cache this lookup above, since inserting into the map
+ // changes the map's size, and thus affects the other IDs.
+ OM.index(V);
+}
+
+static OrderMap orderModule(const Module &M) {
+ // This needs to match the order used by ValueEnumerator::ValueEnumerator()
+ // and ValueEnumerator::incorporateFunction().
+ OrderMap OM;
+
+ // In the reader, initializers of GlobalValues are set *after* all the
+ // globals have been read. Rather than awkwardly modeling this behaviour
+ // directly in predictValueUseListOrderImpl(), just assign IDs to
+ // initializers of GlobalValues before GlobalValues themselves to model this
+ // implicitly.
+ for (const GlobalVariable &G : M.globals())
+ if (G.hasInitializer())
+ if (!isa<GlobalValue>(G.getInitializer()))
+ orderValue(G.getInitializer(), OM);
+ for (const GlobalAlias &A : M.aliases())
+ if (!isa<GlobalValue>(A.getAliasee()))
+ orderValue(A.getAliasee(), OM);
+ for (const Function &F : M)
+ if (F.hasPrefixData())
+ if (!isa<GlobalValue>(F.getPrefixData()))
+ orderValue(F.getPrefixData(), OM);
+ OM.LastGlobalConstantID = OM.size();
+
+ // Initializers of GlobalValues are processed in
+ // BitcodeReader::ResolveGlobalAndAliasInits(). Match the order there rather
+ // than ValueEnumerator, and match the code in predictValueUseListOrderImpl()
+ // by giving IDs in reverse order.
+ //
+ // Since GlobalValues never reference each other directly (just through
+ // initializers), their relative IDs only matter for determining order of
+ // uses in their initializers.
+ for (const Function &F : M)
+ orderValue(&F, OM);
+ for (const GlobalAlias &A : M.aliases())
+ orderValue(&A, OM);
+ for (const GlobalVariable &G : M.globals())
+ orderValue(&G, OM);
+ OM.LastGlobalValueID = OM.size();
+
+ for (const Function &F : M) {
+ if (F.isDeclaration())
+ continue;
+ // Here we need to match the union of ValueEnumerator::incorporateFunction()
+ // and WriteFunction(). Basic blocks are implicitly declared before
+ // anything else (by declaring their size).
+ for (const BasicBlock &BB : F)
+ orderValue(&BB, OM);
+ for (const Argument &A : F.args())
+ orderValue(&A, OM);
+ for (const BasicBlock &BB : F)
+ for (const Instruction &I : BB)
+ for (const Value *Op : I.operands())
+ if ((isa<Constant>(*Op) && !isa<GlobalValue>(*Op)) ||
+ isa<InlineAsm>(*Op))
+ orderValue(Op, OM);
+ for (const BasicBlock &BB : F)
+ for (const Instruction &I : BB)
+ orderValue(&I, OM);
+ }
+ return OM;
+}
+
+static void predictValueUseListOrderImpl(const Value *V, const Function *F,
+ unsigned ID, const OrderMap &OM,
+ UseListOrderStack &Stack) {
+ // Predict use-list order for this one.
+ typedef std::pair<const Use *, unsigned> Entry;
+ SmallVector<Entry, 64> List;
+ for (const Use &U : V->uses())
+ // Check if this user will be serialized.
+ if (OM.lookup(U.getUser()).first)
+ List.push_back(std::make_pair(&U, List.size()));
+
+ if (List.size() < 2)
+ // We may have lost some users.
+ return;
+
+ bool IsGlobalValue = OM.isGlobalValue(ID);
+ std::sort(List.begin(), List.end(), [&](const Entry &L, const Entry &R) {
+ const Use *LU = L.first;
+ const Use *RU = R.first;
+ if (LU == RU)
+ return false;
+
+ auto LID = OM.lookup(LU->getUser()).first;
+ auto RID = OM.lookup(RU->getUser()).first;
+
+ // Global values are processed in reverse order.
+ //
+ // Moreover, initializers of GlobalValues are set *after* all the globals
+ // have been read (despite having earlier IDs). Rather than awkwardly
+ // modeling this behaviour here, orderModule() has assigned IDs to
+ // initializers of GlobalValues before GlobalValues themselves.
+ if (OM.isGlobalValue(LID) && OM.isGlobalValue(RID))
+ return LID < RID;
+
+ // If ID is 4, then expect: 7 6 5 1 2 3.
+ if (LID < RID) {
+ if (RID <= ID)
+ if (!IsGlobalValue) // GlobalValue uses don't get reversed.
+ return true;
+ return false;
+ }
+ if (RID < LID) {
+ if (LID <= ID)
+ if (!IsGlobalValue) // GlobalValue uses don't get reversed.
+ return false;
+ return true;
+ }
+
+ // LID and RID are equal, so we have different operands of the same user.
+ // Assume operands are added in order for all instructions.
+ if (LID <= ID)
+ if (!IsGlobalValue) // GlobalValue uses don't get reversed.
+ return LU->getOperandNo() < RU->getOperandNo();
+ return LU->getOperandNo() > RU->getOperandNo();
+ });
+
+ if (std::is_sorted(
+ List.begin(), List.end(),
+ [](const Entry &L, const Entry &R) { return L.second < R.second; }))
+ // Order is already correct.
+ return;
+
+ // Store the shuffle.
+ Stack.emplace_back(V, F, List.size());
+ assert(List.size() == Stack.back().Shuffle.size() && "Wrong size");
+ for (size_t I = 0, E = List.size(); I != E; ++I)
+ Stack.back().Shuffle[I] = List[I].second;
+}
+
+static void predictValueUseListOrder(const Value *V, const Function *F,
+ OrderMap &OM, UseListOrderStack &Stack) {
+ auto &IDPair = OM[V];
+ assert(IDPair.first && "Unmapped value");
+ if (IDPair.second)
+ // Already predicted.
+ return;
+
+ // Do the actual prediction.
+ IDPair.second = true;
+ if (!V->use_empty() && std::next(V->use_begin()) != V->use_end())
+ predictValueUseListOrderImpl(V, F, IDPair.first, OM, Stack);
+
+ // Recursive descent into constants.
+ if (const Constant *C = dyn_cast<Constant>(V))
+ if (C->getNumOperands()) // Visit GlobalValues.
+ for (const Value *Op : C->operands())
+ if (isa<Constant>(Op)) // Visit GlobalValues.
+ predictValueUseListOrder(Op, F, OM, Stack);
+}
+
+static UseListOrderStack predictUseListOrder(const Module &M) {
+ OrderMap OM = orderModule(M);
+
+ // Use-list orders need to be serialized after all the users have been added
+ // to a value, or else the shuffles will be incomplete. Store them per
+ // function in a stack.
+ //
+ // Aside from function order, the order of values doesn't matter much here.
+ UseListOrderStack Stack;
+
+ // We want to visit the functions backward now so we can list function-local
+ // constants in the last Function they're used in. Module-level constants
+ // have already been visited above.
+ for (auto I = M.rbegin(), E = M.rend(); I != E; ++I) {
+ const Function &F = *I;
+ if (F.isDeclaration())
+ continue;
+ for (const BasicBlock &BB : F)
+ predictValueUseListOrder(&BB, &F, OM, Stack);
+ for (const Argument &A : F.args())
+ predictValueUseListOrder(&A, &F, OM, Stack);
+ for (const BasicBlock &BB : F)
+ for (const Instruction &I : BB)
+ for (const Value *Op : I.operands())
+ if (isa<Constant>(*Op) || isa<InlineAsm>(*Op)) // Visit GlobalValues.
+ predictValueUseListOrder(Op, &F, OM, Stack);
+ for (const BasicBlock &BB : F)
+ for (const Instruction &I : BB)
+ predictValueUseListOrder(&I, &F, OM, Stack);
+ }
+
+ // Visit globals last, since the module-level use-list block will be seen
+ // before the function bodies are processed.
+ for (const GlobalVariable &G : M.globals())
+ predictValueUseListOrder(&G, nullptr, OM, Stack);
+ for (const Function &F : M)
+ predictValueUseListOrder(&F, nullptr, OM, Stack);
+ for (const GlobalAlias &A : M.aliases())
+ predictValueUseListOrder(&A, nullptr, OM, Stack);
+ for (const GlobalVariable &G : M.globals())
+ if (G.hasInitializer())
+ predictValueUseListOrder(G.getInitializer(), nullptr, OM, Stack);
+ for (const GlobalAlias &A : M.aliases())
+ predictValueUseListOrder(A.getAliasee(), nullptr, OM, Stack);
+ for (const Function &F : M)
+ if (F.hasPrefixData())
+ predictValueUseListOrder(F.getPrefixData(), nullptr, OM, Stack);
+
+ return Stack;
+}
+
static bool isIntOrIntVectorValue(const std::pair<const Value*, unsigned> &V) {
return V.first->getType()->isIntOrIntVectorTy();
}
-/// ValueEnumerator - Enumerate module-level information.
-ValueEnumerator::ValueEnumerator(const Module *M) {
+ValueEnumerator::ValueEnumerator(const Module &M) {
+ if (shouldPreserveBitcodeUseListOrder())
+ UseListOrders = predictUseListOrder(M);
+
// Enumerate the global variables.
- for (Module::const_global_iterator I = M->global_begin(),
- E = M->global_end(); I != E; ++I)
+ for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I)
EnumerateValue(I);
// Enumerate the functions.
- for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
+ for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
EnumerateValue(I);
EnumerateAttributes(cast<Function>(I)->getAttributes());
}
// Enumerate the aliases.
- for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
+ for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
I != E; ++I)
EnumerateValue(I);
@@ -50,30 +299,30 @@ ValueEnumerator::ValueEnumerator(const Module *M) {
unsigned FirstConstant = Values.size();
// Enumerate the global variable initializers.
- for (Module::const_global_iterator I = M->global_begin(),
- E = M->global_end(); I != E; ++I)
+ for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I)
if (I->hasInitializer())
EnumerateValue(I->getInitializer());
// Enumerate the aliasees.
- for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
+ for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
I != E; ++I)
EnumerateValue(I->getAliasee());
// Enumerate the prefix data constants.
- for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
+ for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I)
if (I->hasPrefixData())
EnumerateValue(I->getPrefixData());
// Insert constants and metadata that are named at module level into the slot
// pool so that the module symbol table can refer to them...
- EnumerateValueSymbolTable(M->getValueSymbolTable());
+ EnumerateValueSymbolTable(M.getValueSymbolTable());
EnumerateNamedMetadata(M);
- SmallVector<std::pair<unsigned, MDNode*>, 8> MDs;
+ SmallVector<std::pair<unsigned, MDNode *>, 8> MDs;
// Enumerate types used by function bodies and argument lists.
- for (const Function &F : *M) {
+ for (const Function &F : M) {
for (const Argument &A : F.args())
EnumerateType(A.getType());
@@ -179,6 +428,11 @@ void ValueEnumerator::print(raw_ostream &OS, const ValueMapType &Map,
void ValueEnumerator::OptimizeConstants(unsigned CstStart, unsigned CstEnd) {
if (CstStart == CstEnd || CstStart+1 == CstEnd) return;
+ if (shouldPreserveBitcodeUseListOrder())
+ // Optimizing constants makes the use-list order difficult to predict.
+ // Disable it for now when trying to preserve the order.
+ return;
+
std::stable_sort(Values.begin() + CstStart, Values.begin() + CstEnd,
[this](const std::pair<const Value *, unsigned> &LHS,
const std::pair<const Value *, unsigned> &RHS) {
@@ -209,11 +463,12 @@ void ValueEnumerator::EnumerateValueSymbolTable(const ValueSymbolTable &VST) {
EnumerateValue(VI->getValue());
}
-/// EnumerateNamedMetadata - Insert all of the values referenced by
-/// named metadata in the specified module.
-void ValueEnumerator::EnumerateNamedMetadata(const Module *M) {
- for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
- E = M->named_metadata_end(); I != E; ++I)
+/// Insert all of the values referenced by named metadata in the specified
+/// module.
+void ValueEnumerator::EnumerateNamedMetadata(const Module &M) {
+ for (Module::const_named_metadata_iterator I = M.named_metadata_begin(),
+ E = M.named_metadata_end();
+ I != E; ++I)
EnumerateNamedMDNode(I);
}
@@ -239,31 +494,31 @@ void ValueEnumerator::EnumerateMDNodeOperands(const MDNode *N) {
void ValueEnumerator::EnumerateMetadata(const Value *MD) {
assert((isa<MDNode>(MD) || isa<MDString>(MD)) && "Invalid metadata kind");
- // Enumerate the type of this value.
- EnumerateType(MD->getType());
-
+ // Skip function-local nodes themselves, but walk their operands.
const MDNode *N = dyn_cast<MDNode>(MD);
-
- // In the module-level pass, skip function-local nodes themselves, but
- // do walk their operands.
if (N && N->isFunctionLocal() && N->getFunction()) {
EnumerateMDNodeOperands(N);
return;
}
- // Check to see if it's already in!
- unsigned &MDValueID = MDValueMap[MD];
- if (MDValueID) {
- // Increment use count.
- MDValues[MDValueID-1].second++;
+ // Insert a dummy ID to block the co-recursive call to
+ // EnumerateMDNodeOperands() from re-visiting MD in a cyclic graph.
+ //
+ // Return early if there's already an ID.
+ if (!MDValueMap.insert(std::make_pair(MD, 0)).second)
return;
- }
- MDValues.push_back(std::make_pair(MD, 1U));
- MDValueID = MDValues.size();
- // Enumerate all non-function-local operands.
+ // Enumerate the type of this value.
+ EnumerateType(MD->getType());
+
+ // Visit operands first to minimize RAUW.
if (N)
EnumerateMDNodeOperands(N);
+
+ // Replace the dummy ID inserted above with the correct one. MDValueMap may
+ // have changed by inserting operands, so we need a fresh lookup here.
+ MDValues.push_back(MD);
+ MDValueMap[MD] = MDValues.size();
}
/// EnumerateFunctionLocalMetadataa - Incorporate function-local metadata
@@ -277,12 +532,10 @@ void ValueEnumerator::EnumerateFunctionLocalMetadata(const MDNode *N) {
// Check to see if it's already in!
unsigned &MDValueID = MDValueMap[N];
- if (MDValueID) {
- // Increment use count.
- MDValues[MDValueID-1].second++;
+ if (MDValueID)
return;
- }
- MDValues.push_back(std::make_pair(N, 1U));
+
+ MDValues.push_back(N);
MDValueID = MDValues.size();
// To incoroporate function-local information visit all function-local
@@ -487,7 +740,7 @@ void ValueEnumerator::incorporateFunction(const Function &F) {
FnLocalMDVector.push_back(MD);
}
- SmallVector<std::pair<unsigned, MDNode*>, 8> MDs;
+ SmallVector<std::pair<unsigned, MDNode *>, 8> MDs;
I->getAllMetadataOtherThanDebugLoc(MDs);
for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
MDNode *N = MDs[i].second;
@@ -510,7 +763,7 @@ void ValueEnumerator::purgeFunction() {
for (unsigned i = NumModuleValues, e = Values.size(); i != e; ++i)
ValueMap.erase(Values[i].first);
for (unsigned i = NumModuleMDValues, e = MDValues.size(); i != e; ++i)
- MDValueMap.erase(MDValues[i].first);
+ MDValueMap.erase(MDValues[i]);
for (unsigned i = 0, e = BasicBlocks.size(); i != e; ++i)
ValueMap.erase(BasicBlocks[i]);
diff --git a/lib/Bitcode/Writer/ValueEnumerator.h b/lib/Bitcode/Writer/ValueEnumerator.h
index 1c9f38e..563c214 100644
--- a/lib/Bitcode/Writer/ValueEnumerator.h
+++ b/lib/Bitcode/Writer/ValueEnumerator.h
@@ -11,13 +11,14 @@
//
//===----------------------------------------------------------------------===//
-#ifndef VALUE_ENUMERATOR_H
-#define VALUE_ENUMERATOR_H
+#ifndef LLVM_LIB_BITCODE_WRITER_VALUEENUMERATOR_H
+#define LLVM_LIB_BITCODE_WRITER_VALUEENUMERATOR_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/UniqueVector.h"
#include "llvm/IR/Attributes.h"
+#include "llvm/IR/UseListOrder.h"
#include <vector>
namespace llvm {
@@ -42,6 +43,9 @@ public:
// For each value, we remember its Value* and occurrence frequency.
typedef std::vector<std::pair<const Value*, unsigned> > ValueList;
+
+ UseListOrderStack UseListOrders;
+
private:
typedef DenseMap<Type*, unsigned> TypeMapType;
TypeMapType TypeMap;
@@ -54,7 +58,7 @@ private:
typedef UniqueVector<const Comdat *> ComdatSetType;
ComdatSetType Comdats;
- ValueList MDValues;
+ std::vector<const Value *> MDValues;
SmallVector<const MDNode *, 8> FunctionLocalMDs;
ValueMapType MDValueMap;
@@ -92,7 +96,7 @@ private:
ValueEnumerator(const ValueEnumerator &) LLVM_DELETED_FUNCTION;
void operator=(const ValueEnumerator &) LLVM_DELETED_FUNCTION;
public:
- ValueEnumerator(const Module *M);
+ ValueEnumerator(const Module &M);
void dump() const;
void print(raw_ostream &OS, const ValueMapType &Map, const char *Name) const;
@@ -130,7 +134,7 @@ public:
}
const ValueList &getValues() const { return Values; }
- const ValueList &getMDValues() const { return MDValues; }
+ const std::vector<const Value *> &getMDValues() const { return MDValues; }
const SmallVectorImpl<const MDNode *> &getFunctionLocalMDValues() const {
return FunctionLocalMDs;
}
@@ -172,7 +176,7 @@ private:
void EnumerateAttributes(AttributeSet PAL);
void EnumerateValueSymbolTable(const ValueSymbolTable &ST);
- void EnumerateNamedMetadata(const Module *M);
+ void EnumerateNamedMetadata(const Module &M);
};
} // End llvm namespace
generated by cgit v1.1 at 2024-06-01 15:37:52 +0000