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https://github.com/darlinghq/darling-libobjc2.git
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107 lines
3.5 KiB
C++
107 lines
3.5 KiB
C++
#include "llvm/Pass.h"
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#include "llvm/Function.h"
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#include "llvm/Module.h"
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#include "llvm/Instructions.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/Constants.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/Support/IRBuilder.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/InlineCost.h"
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#include "IMPCacher.h"
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#include <string>
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using namespace llvm;
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using std::string;
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// Mangle a method name
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//
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// From clang:
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static std::string SymbolNameForMethod(const std::string &ClassName, const
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std::string &CategoryName, const std::string &MethodName, bool isClassMethod)
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{
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std::string MethodNameColonStripped = MethodName;
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std::replace(MethodNameColonStripped.begin(), MethodNameColonStripped.end(),
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':', '_');
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return std::string(isClassMethod ? "_c_" : "_i_") + ClassName + "_" +
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CategoryName + "_" + MethodNameColonStripped;
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}
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namespace
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{
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class ClassMethodInliner : public ModulePass
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{
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const IntegerType *IntTy;
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public:
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static char ID;
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ClassMethodInliner() : ModulePass((intptr_t)&ID) {}
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virtual bool runOnModule(Module &M) {
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unsigned MessageSendMDKind = M.getContext().getMDKindID("GNUObjCMessageSend");
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InlineCostAnalyzer CA;
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SmallPtrSet<const Function *, 16> NeverInline;
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GNUstep::IMPCacher cacher = GNUstep::IMPCacher(M.getContext(), this);
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// FIXME: ILP64
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IntTy = Type::getInt32Ty(M.getContext());
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bool modified = false;
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for (Module::iterator F=M.begin(), fend=M.end() ;
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F != fend ; ++F) {
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SmallVector<CallSite, 16> messages;
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if (F->isDeclaration()) { continue; }
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for (Function::iterator i=F->begin(), end=F->end() ;
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i != end ; ++i) {
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for (BasicBlock::iterator b=i->begin(), last=i->end() ;
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b != last ; ++b) {
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CallSite call = CallSite::get(b);
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if (call.getInstruction() && !call.getCalledFunction()) {
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MDNode *messageType = call->getMetadata(MessageSendMDKind);
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if (0 == messageType) { continue; }
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messages.push_back(call);
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}
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}
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}
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for (SmallVectorImpl<CallSite>::iterator i=messages.begin(),
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e=messages.end() ; e!=i ; i++) {
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MDNode *messageType = (*i)->getMetadata(MessageSendMDKind);
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StringRef sel =
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cast<MDString>(messageType->getOperand(0))->getString();
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StringRef cls =
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cast<MDString>(messageType->getOperand(1))->getString();
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bool isClassMethod =
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cast<ConstantInt>(messageType->getOperand(2))->isOne();
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StringRef functionName = SymbolNameForMethod(cls, "", sel, isClassMethod);
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Function *method = M.getFunction(functionName);
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if (0 == method || method->isDeclaration()) { continue; }
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InlineCost IC = CA.getInlineCost((*i), method, NeverInline);
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// FIXME: 200 is a random number. Pick a better one!
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if (IC.isAlways() || (IC.isVariable() && IC.getValue() < 200)) {
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cacher.SpeculativelyInline((*i).getInstruction(), method);
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i->getInstruction()->setMetadata(MessageSendMDKind, 0);
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modified = true;
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}
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}
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}
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return modified;
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}
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};
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char ClassMethodInliner::ID = 0;
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RegisterPass<ClassMethodInliner> X("gnu-class-method-inline",
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"Inline class methods and message sends to super");
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}
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ModulePass *createClassMethodInliner(void)
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{
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return new ClassMethodInliner();
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}
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