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我正在尝试使用 Clang 在 C 代码中查找 if 条件。
到目前为止,我所学到的是使用 HandleTopLevelDecl() 查找声明。
我现在要做的是找到一个类似于 HandleTopLevelDecl() 但处理 If-Conditions 的函数。
我的问题是,我走在正确的道路上吗?有没有可以做到这一点的功能?
如果没有,你建议我做什么?
谢谢。
最佳答案
在这个很棒的类(class)的帮助下:http://swtv.kaist.ac.kr/courses/cs453-fall13
特别是这个教程:http://swtv.kaist.ac.kr/courses/cs453-fall13/Clang%20tutorial%20v4.pdf
我已经解决了这个问题。
我需要创建一个 RecursiveASTVisitor 并在访问语句时处理 If 语句。
class MyASTVisitor : public RecursiveASTVisitor<MyASTVisitor>
{
public:
bool VisitStmt(Stmt *s) {
// Search for If-Statements
if(isa<IfStmt>(s))
{
cerr << "Found IF" << endl;
}
return true;
}
bool VisitFunctionDecl(FunctionDecl *f) {
// Print function name
cerr << f->getNameAsString().c_str() << endl;
return true;
}
};
完整代码如下:
#include <cstdio>
#include <string>
#include <iostream>
#include <sstream>
#include <map>
#include <utility>
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetOptions.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Parse/ParseAST.h"
#include "clang/Rewrite/Core/Rewriter.h"
#include "clang/Rewrite/Frontend/Rewriters.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang;
using namespace std;
// CompilerInstance
CompilerInstance TheCompInst;
class MyASTVisitor : public RecursiveASTVisitor<MyASTVisitor>
{
public:
bool VisitStmt(Stmt *s) {
// Search for If-Statements
if(isa<IfStmt>(s))
{
SourceManager &srcmgr = TheCompInst.getSourceManager();
SourceLocation startLocation = s->getLocStart();
unsigned int start_lineNum = srcmgr.getExpansionLineNumber(startLocation);
cerr << "Found IF @ Line: " << start_lineNum << endl;
}
return true;
}
bool VisitFunctionDecl(FunctionDecl *f) {
// Print function name
cerr << f->getNameAsString().c_str() << endl;
return true;
}
};
class MyASTConsumer : public ASTConsumer
{
public:
MyASTConsumer()
: Visitor() //initialize MyASTVisitor
{}
virtual bool HandleTopLevelDecl(DeclGroupRef DR) {
for (DeclGroupRef::iterator b = DR.begin(), e = DR.end(); b != e; ++b) {
// Travel each function declaration using MyASTVisitor
Visitor.TraverseDecl(*b);
}
return true;
}
private:
MyASTVisitor Visitor;
};
int main(int argc, char *argv[])
{
if (argc != 2) {
llvm::errs() << "Usage: kcov-branch-identify <filename>\n";
return 1;
}
// Diagnostics manage problems and issues in compile
TheCompInst.createDiagnostics(NULL, false);
// Set target platform options
// Initialize target info with the default triple for our platform.
TargetOptions *TO = new TargetOptions();
TO->Triple = llvm::sys::getDefaultTargetTriple();
TargetInfo *TI = TargetInfo::CreateTargetInfo(TheCompInst.getDiagnostics(), TO);
TheCompInst.setTarget(TI);
// FileManager supports for file system lookup, file system caching, and directory search management.
TheCompInst.createFileManager();
FileManager &FileMgr = TheCompInst.getFileManager();
// SourceManager handles loading and caching of source files into memory.
TheCompInst.createSourceManager(FileMgr);
SourceManager &SourceMgr = TheCompInst.getSourceManager();
// Prreprocessor runs within a single source file
TheCompInst.createPreprocessor();
// ASTContext holds long-lived AST nodes (such as types and decls) .
TheCompInst.createASTContext();
// A Rewriter helps us manage the code rewriting task.
Rewriter TheRewriter;
TheRewriter.setSourceMgr(SourceMgr, TheCompInst.getLangOpts());
// Set the main file handled by the source manager to the input file.
const FileEntry *FileIn = FileMgr.getFile(argv[1]);
SourceMgr.createMainFileID(FileIn);
// Inform Diagnostics that processing of a source file is beginning.
TheCompInst.getDiagnosticClient().BeginSourceFile(TheCompInst.getLangOpts(),&TheCompInst.getPreprocessor());
// Create an AST consumer instance which is going to get called by ParseAST.
MyASTConsumer TheConsumer;
// Parse the file to AST, registering our consumer as the AST consumer.
ParseAST(TheCompInst.getPreprocessor(), &TheConsumer, TheCompInst.getASTContext());
return 0;
}
关于c++ - 使用 Clang 查找 If 条件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25591013/
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