我正在遍历CAST AST，但是遍历包含clang :: SubstTemplateTypeParmType的AST声明的类型信息时遇到麻烦。
将以下最少的输入代码提供给clang工具
ParameterMap通过Map的类型递归时，clang表示第一个String参数arg clang::SubstTemplateTypeParmType是String。如果我尝试通过递归或获取替换类型（下面的代码）来进一步递归以获得有关Type::Record的更多信息，则基础类型为std::basic_string，并且为basic_string<const char*, std::char_traits<const char*>, std::allocator<const char*>>。这对我来说是意外的，因为我希望基础类型是模板特化，例如std::basic_string。由于该节点是一条记录，因此我可以知道该映射包含一个basic_string，但是无法获取basic_string的模板信息。在这种情况下如何获得case Type::SubstTemplateTypeParm:
{
auto substTemplateType = qualType->getAs<SubstTemplateTypeParmType>();
walkType(substTemplateType->getReplacementType());
return;
}
的模板专业化信息？
[
{"directory":"F:/git/minRepro/","command":"\"C:/Program Files (x86)/compilers/clang.exe\" -Wall -isystem -g -std=c++14 -Wno-format -Wno-unneeded-internal-declaration -Werror F:/git/minRepro/exampleSource.cpp","file":"F:/git/minRepro/exampleSource.cpp"}
]
我了解以下要求发布最小可运行代码示例的要求。但是，这需要一个clang工具依赖项，因为它没有预构建，因此插入和运行起来并不容易。
路径是硬编码的，因此需要根据本地设置进行更新。这是compile_commands文件，该文件还有3个要更新的路径。编译器路径，最后两次是文件路径。
#pragma comment(lib,"Version.lib")
#include <clang/Tooling/JSONCompilationDatabase.h>
#include <clang/Tooling/Tooling.h>
#include <clang/Frontend/FrontendAction.h>
#include <clang/Sema/SemaConsumer.h>
#include <clang/AST/Type.h>
#include <clang/AST/TemplateName.h>
#include <clang/AST/Decl.h>
#include <clang/AST/DeclTemplate.h>
#include <clang/Frontend/CompilerInstance.h>
#include <iostream>
#include <cstdlib>
#include <cassert>
#include <vector>
#include <string>
class AstWalker : public clang::SemaConsumer
{
public:
AstWalker(clang::ASTContext& context)
: m_context(context)
{}
virtual void HandleTranslationUnit(clang::ASTContext& context)
{
using namespace clang;
for (auto declaration : context.getTranslationUnitDecl()->decls())
{
const auto&sm = m_context.getSourceManager();
if (!declaration->getBeginLoc().isValid())
continue;
// Only walk declarations from our file.
if (!sm.isInMainFile(sm.getSpellingLoc(declaration->getBeginLoc())))
continue;
// Find functions, and inspect their return type.
auto nodeKind = declaration->getKind();
if (nodeKind == Decl::Function)
{
auto funcDecl = cast<FunctionDecl>(declaration);
// Check for and ignore built-in functions.
if (funcDecl->getBuiltinID() != 0)
break;
walkType(funcDecl->getReturnType());
break;
}
}
}
void walkType(const clang::QualType& qualType)
{
using namespace clang;
auto classType = qualType->getTypeClass();
switch (classType)
{
case Type::Typedef:
{
auto typedefType = qualType->getAs<TypedefType>();
walkType(typedefType->desugar());
return;
}
case Type::TemplateSpecialization:
{
auto templateSpecialization = qualType->getAs<TemplateSpecializationType>();
if (templateSpecialization->isTypeAlias())
{
walkType(templateSpecialization->getAliasedType());
return;
}
std::string templateType = templateSpecialization->getTemplateName().getAsTemplateDecl()->getQualifiedNameAsString();
std::cout << templateType << "<";
auto numArgs = templateSpecialization->getNumArgs();
for (unsigned int i = 0; i < numArgs; ++i)
{
if (i > 0)
std::cout << ", ";
const clang::TemplateArgument& templateArg = templateSpecialization->getArg(i);
if (templateArg.getKind() == clang::TemplateArgument::ArgKind::Type)
{
walkType(templateArg.getAsType());
}
}
std::cout << ">";
return;
}
case Type::Record:
{
const auto record = qualType->getAs<RecordType>();
std::string recordQualifiedName = record->getAsRecordDecl()->getQualifiedNameAsString();
std::cout << recordQualifiedName;
return;
}
case Type::Elaborated:
{
auto elaboratedType = qualType->getAs<ElaboratedType>();
walkType(elaboratedType->desugar());
return;
}
case Type::SubstTemplateTypeParm:
{
auto substTemplateType = qualType->getAs<SubstTemplateTypeParmType>();
walkType(substTemplateType->desugar());
//Also tried getReplacementType.
//walkType(substTemplateType->getReplacementType());
return;
}
}
}
private:
clang::ASTContext& m_context;
};
class ExampleAction : public clang::ASTFrontendAction
{
public:
ExampleAction() {}
virtual std::unique_ptr<clang::ASTConsumer> CreateASTConsumer(clang::CompilerInstance& compiler, llvm::StringRef inFile)
{
return std::unique_ptr<clang::ASTConsumer>(new AstWalker(compiler.getASTContext()));
}
};
int main(int argc, char **argv)
{
// Create the compilation database.
std::string errorOut;
std::unique_ptr<clang::tooling::JSONCompilationDatabase> compilationDatabase = clang::tooling::JSONCompilationDatabase::loadFromFile("F:/git/minRepro/compile_commands.json", errorOut, clang::tooling::JSONCommandLineSyntax::AutoDetect);
if (compilationDatabase == nullptr || !errorOut.empty())
{
std::cout << "[Error] Failed to load compilation database. Error=" << errorOut.c_str() << std::endl;
return false;
}
std::vector<std::string> headerFiles;
headerFiles.push_back("F:/git/minRepro/exampleSource.cpp");
clang::tooling::ClangTool tool(*compilationDatabase, llvm::ArrayRef<std::string>(headerFiles));
auto toolResult = tool.run(clang::tooling::newFrontendActionFactory<ExampleAction>().get());
if (toolResult == 1)
{
std::cout << "[Error] Error occurred. Check log. Aborting.\n";
assert(false);
return false;
}
}
代码：
wp-content/uploads答案 0 :(得分：1)
在某些情况下，模板信息嵌套在给定ClassTemplateSpecializationDecl的{{1}}中。您可以通过将RecordType转换为RecordDecl来阅读它。
ClassTemplateSpecializationDecl