Static Analysis

#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/DominatorTree.h"

void analyze(llvm::Function& F, llvm::FunctionAnalysisManager& FAM) {
    // Get dominator tree
    auto& DT = FAM.getResult<llvm::DominatorTreeAnalysis>(F);
    
    // Get loop info
    auto& LI = FAM.getResult<llvm::LoopAnalysis>(F);
    
    // Get alias analysis
    auto& AA = FAM.getResult<llvm::AAManager>(F);
    
    // Check if two pointers may alias
    llvm::AliasResult AR = AA.alias(Ptr1, Ptr2);
}

class TaintAnalysis {
    std::set<llvm::Value*> taintedValues;
    
public:
    void markTainted(llvm::Value* V) {
        taintedValues.insert(V);
    }
    
    bool isTainted(llvm::Value* V) {
        return taintedValues.count(V) > 0;
    }
    
    void propagate(llvm::Instruction* I) {
        // Propagate taint through operations
        for (auto& Op : I->operands()) {
            if (isTainted(Op)) {
                markTainted(I);
                break;
            }
        }
    }
};

// Define taint sources (user input, network, files)
bool isTaintSource(llvm::CallInst* CI) {
    llvm::Function* F = CI->getCalledFunction();
    if (!F) return false;
    
    static const std::set<std::string> sources = {
        "read", "recv", "fread", "getenv", "gets", "scanf"
    };
    return sources.count(F->getName().str()) > 0;
}

// Define sensitive sinks (SQL queries, system calls, format strings)
bool isSensitiveSink(llvm::CallInst* CI) {
    llvm::Function* F = CI->getCalledFunction();
    if (!F) return false;
    
    static const std::set<std::string> sinks = {
        "system", "exec", "printf", "strcpy", "memcpy", "sql_query"
    };
    return sinks.count(F->getName().str()) > 0;
}

#include "llvm/Analysis/CFLAndersAliasAnalysis.h"

// Check may-alias relationship
void checkAlias(llvm::AAResults& AA, llvm::Value* P1, llvm::Value* P2) {
    switch (AA.alias(P1, P2)) {
        case llvm::AliasResult::NoAlias:
            // Definitely don't alias
            break;
        case llvm::AliasResult::MayAlias:
            // Might alias
            break;
        case llvm::AliasResult::MustAlias:
            // Always alias
            break;
    }
}

// Track what each pointer may point to
class PointsToAnalysis {
    std::map<llvm::Value*, std::set<llvm::Value*>> pointsTo;
    
public:
    void addPointsTo(llvm::Value* ptr, llvm::Value* target) {
        pointsTo[ptr].insert(target);
    }
    
    const std::set<llvm::Value*>& getPointsTo(llvm::Value* ptr) {
        return pointsTo[ptr];
    }
};

#include "llvm/Analysis/DDG.h"

void buildDDG(llvm::Function& F, llvm::FunctionAnalysisManager& FAM) {
    auto& LI = FAM.getResult<llvm::LoopAnalysis>(F);
    
    for (auto* L : LI) {
        llvm::DataDependenceGraph DDG(*L, FAM.getResult<llvm::AAManager>(F));
        
        for (auto& Node : DDG) {
            // Analyze data dependencies in loop
        }
    }
}

// Buffer overflow detection
void checkBufferAccess(llvm::GetElementPtrInst* GEP) {
    // Get array size if available
    llvm::Type* SourceType = GEP->getSourceElementType();
    if (auto* AT = llvm::dyn_cast<llvm::ArrayType>(SourceType)) {
        uint64_t arraySize = AT->getNumElements();
        
        // Check if index might exceed bounds
        llvm::Value* Index = GEP->getOperand(2);
        // Perform range analysis on index
    }
}