#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"
#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 {
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:
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());
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())
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) {
if (NeedsMetadataAttachment)
WriteMetadataAttachment(F, VE, Stream);
+ if (shouldPreserveBitcodeUseListOrder())
+ WriteUseListBlock(&F, VE, Stream);
VE.purgeFunction();
Stream.ExitBlock();
}
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);
// 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)
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