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-rw-r--r--llvm/lib/Linker/LinkModules.cpp191
-rw-r--r--llvm/lib/VMCore/Module.cpp40
2 files changed, 226 insertions, 5 deletions
diff --git a/llvm/lib/Linker/LinkModules.cpp b/llvm/lib/Linker/LinkModules.cpp
index 73ae6ad8c2d..8e2fc4fe3fd 100644
--- a/llvm/lib/Linker/LinkModules.cpp
+++ b/llvm/lib/Linker/LinkModules.cpp
@@ -16,8 +16,10 @@
#include "llvm/DerivedTypes.h"
#include "llvm/Instructions.h"
#include "llvm/Module.h"
-#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/SetVector.h"
+#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Path.h"
#include "llvm/Transforms/Utils/Cloning.h"
@@ -406,11 +408,19 @@ namespace {
}
void computeTypeMapping();
+ bool categorizeModuleFlagNodes(const NamedMDNode *ModFlags,
+ DenseMap<MDString*, MDNode*> &ErrorNode,
+ DenseMap<MDString*, MDNode*> &WarningNode,
+ DenseMap<MDString*, MDNode*> &OverrideNode,
+ DenseMap<MDString*,
+ SmallSetVector<MDNode*, 8> > &RequireNodes,
+ SmallSetVector<MDString*, 16> &SeenIDs);
bool linkAppendingVarProto(GlobalVariable *DstGV, GlobalVariable *SrcGV);
bool linkGlobalProto(GlobalVariable *SrcGV);
bool linkFunctionProto(Function *SrcF);
bool linkAliasProto(GlobalAlias *SrcA);
+ bool linkModuleFlagsMetadata();
void linkAppendingVarInit(const AppendingVarInfo &AVI);
void linkGlobalInits();
@@ -938,8 +948,11 @@ void ModuleLinker::linkAliasBodies() {
/// linkNamedMDNodes - Insert all of the named mdnodes in Src into the Dest
/// module.
void ModuleLinker::linkNamedMDNodes() {
+ const NamedMDNode *SrcModFlags = SrcM->getModuleFlagsMetadata();
for (Module::const_named_metadata_iterator I = SrcM->named_metadata_begin(),
E = SrcM->named_metadata_end(); I != E; ++I) {
+ // Don't link module flags here. Do them separately.
+ if (&*I == SrcModFlags) continue;
NamedMDNode *DestNMD = DstM->getOrInsertNamedMetadata(I->getName());
// Add Src elements into Dest node.
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
@@ -947,10 +960,175 @@ void ModuleLinker::linkNamedMDNodes() {
RF_None, &TypeMap));
}
}
+
+/// categorizeModuleFlagNodes -
+bool ModuleLinker::
+categorizeModuleFlagNodes(const NamedMDNode *ModFlags,
+ DenseMap<MDString*, MDNode*> &ErrorNode,
+ DenseMap<MDString*, MDNode*> &WarningNode,
+ DenseMap<MDString*, MDNode*> &OverrideNode,
+ DenseMap<MDString*,
+ SmallSetVector<MDNode*, 8> > &RequireNodes,
+ SmallSetVector<MDString*, 16> &SeenIDs) {
+ bool HasErr = false;
+
+ for (unsigned I = 0, E = ModFlags->getNumOperands(); I != E; ++I) {
+ MDNode *Op = ModFlags->getOperand(I);
+ assert(Op->getNumOperands() == 3 && "Invalid module flag metadata!");
+ assert(isa<ConstantInt>(Op->getOperand(0)) &&
+ "Module flag's first operand must be an integer!");
+ assert(isa<MDString>(Op->getOperand(1)) &&
+ "Module flag's second operand must be an MDString!");
+
+ ConstantInt *Behavior = cast<ConstantInt>(Op->getOperand(0));
+ MDString *ID = cast<MDString>(Op->getOperand(1));
+ Value *Val = Op->getOperand(2);
+ switch (Behavior->getZExtValue()) {
+ default:
+ assert(false && "Invalid behavior in module flag metadata!");
+ break;
+ case Module::Error: {
+ MDNode *&ErrNode = ErrorNode[ID];
+ if (!ErrNode) ErrNode = Op;
+ if (ErrNode->getOperand(2) != Val)
+ HasErr = emitError("Linking module flags '" + ID->getString() +
+ "': IDs have conflicting values!");
+ break;
+ }
+ case Module::Warning: {
+ MDNode *&WarnNode = WarningNode[ID];
+ if (!WarnNode) WarnNode = Op;
+ if (WarnNode->getOperand(2) != Val)
+ errs() << "WARNING: Linking module flags '" << ID->getString()
+ << "': IDs have conflicting values!";
+ break;
+ }
+ case Module::Require: RequireNodes[ID].insert(Op); break;
+ case Module::Override: {
+ MDNode *&OvrNode = OverrideNode[ID];
+ if (!OvrNode) OvrNode = Op;
+ if (OvrNode->getOperand(2) != Val)
+ HasErr = emitError("Linking module flags '" + ID->getString() +
+ "': IDs have conflicting override values!");
+ break;
+ }
+ }
+
+ SeenIDs.insert(ID);
+ }
+
+ return HasErr;
+}
+
+/// linkModuleFlagsMetadata - Merge the linker flags in Src into the Dest
+/// module.
+bool ModuleLinker::linkModuleFlagsMetadata() {
+ const NamedMDNode *SrcModFlags = SrcM->getModuleFlagsMetadata();
+ if (!SrcModFlags) return false;
+
+ NamedMDNode *DstModFlags = DstM->getOrInsertModuleFlagsMetadata();
+
+ // If the destination module doesn't have module flags yet, then just copy
+ // over the source module's flags.
+ if (DstModFlags->getNumOperands() == 0) {
+ for (unsigned I = 0, E = SrcModFlags->getNumOperands(); I != E; ++I)
+ DstModFlags->addOperand(SrcModFlags->getOperand(I));
+
+ return false;
+ }
+
+ bool HasErr = false;
+
+ // Otherwise, we have to merge them based on their behaviors. First,
+ // categorize all of the nodes in the modules' module flags. If an error or
+ // warning occurs, then emit the appropriate message(s).
+ DenseMap<MDString*, MDNode*> ErrorNode;
+ DenseMap<MDString*, MDNode*> WarningNode;
+ DenseMap<MDString*, MDNode*> OverrideNode;
+ DenseMap<MDString*, SmallSetVector<MDNode*, 8> > RequireNodes;
+ SmallSetVector<MDString*, 16> SeenIDs;
+
+ HasErr |= categorizeModuleFlagNodes(SrcModFlags, ErrorNode, WarningNode,
+ OverrideNode, RequireNodes, SeenIDs);
+ HasErr |= categorizeModuleFlagNodes(DstModFlags, ErrorNode, WarningNode,
+ OverrideNode, RequireNodes, SeenIDs);
+
+ // Check that there isn't both an error and warning node for a flag.
+ for (SmallSetVector<MDString*, 16>::iterator
+ I = SeenIDs.begin(), E = SeenIDs.end(); I != E; ++I) {
+ MDString *ID = *I;
+ if (ErrorNode[ID] && WarningNode[ID])
+ HasErr = emitError("Linking module flags '" + ID->getString() +
+ "': IDs have conflicting behaviors");
+ }
+
+ // Early exit if we had an error.
+ if (HasErr) return true;
+
+ // Get the destination's module flags ready for new operands.
+ DstModFlags->dropAllReferences();
+
+ // Add all of the module flags to the destination module.
+ DenseMap<MDString*, SmallVector<MDNode*, 4> > AddedNodes;
+ for (SmallSetVector<MDString*, 16>::iterator
+ I = SeenIDs.begin(), E = SeenIDs.end(); I != E; ++I) {
+ MDString *ID = *I;
+ if (OverrideNode[ID]) {
+ DstModFlags->addOperand(OverrideNode[ID]);
+ AddedNodes[ID].push_back(OverrideNode[ID]);
+ } else if (ErrorNode[ID]) {
+ DstModFlags->addOperand(ErrorNode[ID]);
+ AddedNodes[ID].push_back(ErrorNode[ID]);
+ } else if (WarningNode[ID]) {
+ DstModFlags->addOperand(WarningNode[ID]);
+ AddedNodes[ID].push_back(WarningNode[ID]);
+ }
+
+ for (SmallSetVector<MDNode*, 8>::iterator
+ II = RequireNodes[ID].begin(), IE = RequireNodes[ID].end();
+ II != IE; ++II)
+ DstModFlags->addOperand(*II);
+ }
+
+ // Now check that all of the requirements have been satisfied.
+ for (SmallSetVector<MDString*, 16>::iterator
+ I = SeenIDs.begin(), E = SeenIDs.end(); I != E; ++I) {
+ MDString *ID = *I;
+ SmallSetVector<MDNode*, 8> &Set = RequireNodes[ID];
+
+ for (SmallSetVector<MDNode*, 8>::iterator
+ II = Set.begin(), IE = Set.end(); II != IE; ++II) {
+ MDNode *Node = *II;
+ assert(isa<MDNode>(Node->getOperand(2)) &&
+ "Module flag's third operand must be an MDNode!");
+ MDNode *Val = cast<MDNode>(Node->getOperand(2));
+
+ MDString *ReqID = cast<MDString>(Val->getOperand(0));
+ Value *ReqVal = Val->getOperand(1);
+
+ bool HasValue = false;
+ for (SmallVectorImpl<MDNode*>::iterator
+ RI = AddedNodes[ReqID].begin(), RE = AddedNodes[ReqID].end();
+ RI != RE; ++RI) {
+ MDNode *ReqNode = *RI;
+ if (ReqNode->getOperand(2) == ReqVal) {
+ HasValue = true;
+ break;
+ }
+ }
+
+ if (!HasValue)
+ HasErr = emitError("Linking module flags '" + ReqID->getString() +
+ "': does not have the required value!");
+ }
+ }
+
+ return HasErr;
+}
bool ModuleLinker::run() {
- assert(DstM && "Null Destination module");
- assert(SrcM && "Null Source Module");
+ assert(DstM && "Null destination module");
+ assert(SrcM && "Null source module");
// Inherit the target data from the source module if the destination module
// doesn't have one already.
@@ -1030,7 +1208,6 @@ bool ModuleLinker::run() {
// Link in the function bodies that are defined in the source module into
// DstM.
for (Module::iterator SF = SrcM->begin(), E = SrcM->end(); SF != E; ++SF) {
-
// Skip if not linking from source.
if (DoNotLinkFromSource.count(SF)) continue;
@@ -1048,11 +1225,15 @@ bool ModuleLinker::run() {
// Resolve all uses of aliases with aliasees.
linkAliasBodies();
- // Remap all of the named mdnoes in Src into the DstM module. We do this
+ // Remap all of the named MDNodes in Src into the DstM module. We do this
// after linking GlobalValues so that MDNodes that reference GlobalValues
// are properly remapped.
linkNamedMDNodes();
+ // Merge the module flags into the DstM module.
+ if (linkModuleFlagsMetadata())
+ return true;
+
// Process vector of lazily linked in functions.
bool LinkedInAnyFunctions;
do {
diff --git a/llvm/lib/VMCore/Module.cpp b/llvm/lib/VMCore/Module.cpp
index c29029bf6c0..09468184cc1 100644
--- a/llvm/lib/VMCore/Module.cpp
+++ b/llvm/lib/VMCore/Module.cpp
@@ -321,11 +321,51 @@ NamedMDNode *Module::getOrInsertNamedMetadata(StringRef Name) {
return NMD;
}
+/// eraseNamedMetadata - Remove the given NamedMDNode from this module and
+/// delete it.
void Module::eraseNamedMetadata(NamedMDNode *NMD) {
static_cast<StringMap<NamedMDNode *> *>(NamedMDSymTab)->erase(NMD->getName());
NamedMDList.erase(NMD);
}
+/// getModuleFlagsMetadata - Returns the NamedMDNode in the module that
+/// represents module-level flags. This method returns null if there are no
+/// module-level flags.
+NamedMDNode *Module::getModuleFlagsMetadata() const {
+ return getNamedMetadata("llvm.module.flags");
+}
+
+/// getOrInsertModuleFlagsMetadata - Returns the NamedMDNode in the module that
+/// represents module-level flags. If module-level flags aren't found, it
+/// creates the named metadata that contains them.
+NamedMDNode *Module::getOrInsertModuleFlagsMetadata() {
+ return getOrInsertNamedMetadata("llvm.module.flags");
+}
+
+/// addModuleFlag - Add a module-level flag to the module-level flags
+/// metadata. It will create the module-level flags named metadata if it doesn't
+/// already exist.
+void Module::addModuleFlag(ModAttrBehavior Behavior, StringRef Key,
+ Value *Val) {
+ Type *Int32Ty = Type::getInt32Ty(Context);
+ Value *Ops[3] = {
+ ConstantInt::get(Int32Ty, Behavior), MDString::get(Context, Key), Val
+ };
+ getOrInsertModuleFlagsMetadata()->addOperand(MDNode::get(Context, Ops));
+}
+void Module::addModuleFlag(ModAttrBehavior Behavior, StringRef Key,
+ uint32_t Val) {
+ Type *Int32Ty = Type::getInt32Ty(Context);
+ addModuleFlag(Behavior, Key, ConstantInt::get(Int32Ty, Val));
+}
+void Module::addModuleFlag(MDNode *Node) {
+ assert(Node->getNumOperands() == 3 &&
+ "Invalid number of operands for module flag!");
+ assert(isa<ConstantInt>(Node->getOperand(0)) &&
+ isa<MDString>(Node->getOperand(1)) &&
+ "Invalid operand types for module flag!");
+ getOrInsertModuleFlagsMetadata()->addOperand(Node);
+}
//===----------------------------------------------------------------------===//
// Methods to control the materialization of GlobalValues in the Module.
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