Add logic to LLDB to figure out the types of member functions of C++ classes. Add plumbing for that all the way up to the SB layer

llvm-svn: 217701

lldb/include/lldb/API/SBType.h

@@ -161,6 +161,12 @@ public:
     lldb::SBTypeList
     GetFunctionArgumentTypes ();
     
+    uint32_t
+    GetNumberOfMemberFunctions ();
+    
+    lldb::SBType
+    GetMemberFunctionAtIndex (uint32_t idx);
+
     const char*
     GetName();
     

lldb/include/lldb/Symbol/ClangASTType.h

@@ -334,6 +334,12 @@ public:
     ClangASTType
     GetFunctionReturnType () const;
     
+    size_t
+    GetNumMemberFunctions () const;
+    
+    ClangASTType
+    GetMemberFunctionAtIndex (size_t idx);
+    
     ClangASTType
     GetLValueReferenceType () const;
     

lldb/scripts/Python/interface/SBType.i

@@ -240,6 +240,12 @@ public:
     lldb::SBTypeList
     GetFunctionArgumentTypes ();
     
+    uint32_t
+    GetNumberOfMemberFunctions ();
+    
+    lldb::SBType
+    GetMemberFunctionAtIndex (uint32_t idx);
+
     bool
     IsTypeComplete ();
 

lldb/source/API/SBType.cpp

@@ -252,6 +252,28 @@ SBType::GetFunctionArgumentTypes ()
     return sb_type_list;
 }
 
+uint32_t
+SBType::GetNumberOfMemberFunctions ()
+{
+    if (IsValid())
+    {
+        return m_opaque_sp->GetClangASTType(true).GetNumMemberFunctions();
+    }
+    return 0;
+}
+
+lldb::SBType
+SBType::GetMemberFunctionAtIndex (uint32_t idx)
+{
+    SBType sb_func_type;
+    if (IsValid())
+    {
+        ClangASTType func_type(m_opaque_sp->GetClangASTType(true).GetMemberFunctionAtIndex(idx));
+        sb_func_type = SBType(func_type);
+    }
+    return sb_func_type;
+}
+
 lldb::SBType
 SBType::GetUnqualifiedType()
 {

lldb/source/Symbol/ClangASTType.cpp

@@ -47,6 +47,7 @@
 #include "lldb/Target/ExecutionContext.h"
 #include "lldb/Target/Process.h"
 
+#include <iterator>
 #include <mutex>
 
 using namespace lldb;
@@ -1741,6 +1742,68 @@ ClangASTType::GetFunctionReturnType () const
     return ClangASTType();
 }
 
+size_t
+ClangASTType::GetNumMemberFunctions () const
+{
+    size_t num_functions = 0;
+    if (IsValid())
+    {
+        clang::QualType qual_type(GetCanonicalQualType());
+        switch (qual_type->getTypeClass()) {
+            case clang::Type::Record:
+                if (GetCompleteQualType (m_ast, qual_type))
+                {
+                    const clang::RecordType *record_type = llvm::cast<clang::RecordType>(qual_type.getTypePtr());
+                    const clang::RecordDecl *record_decl = record_type->getDecl();
+                    assert(record_decl);
+                    const clang::CXXRecordDecl *cxx_record_decl = llvm::dyn_cast<clang::CXXRecordDecl>(record_decl);
+                    if (cxx_record_decl)
+                        num_functions = std::distance(cxx_record_decl->method_begin(), cxx_record_decl->method_end());
+                    break;
+                }
+                
+            default:
+                break;
+        }
+    }
+    return num_functions;
+}
+
+ClangASTType
+ClangASTType::GetMemberFunctionAtIndex (size_t idx)
+{
+    if (IsValid())
+    {
+        clang::QualType qual_type(GetCanonicalQualType());
+        switch (qual_type->getTypeClass()) {
+            case clang::Type::Record:
+                if (GetCompleteQualType (m_ast, qual_type))
+                {
+                    const clang::RecordType *record_type = llvm::cast<clang::RecordType>(qual_type.getTypePtr());
+                    const clang::RecordDecl *record_decl = record_type->getDecl();
+                    assert(record_decl);
+                    const clang::CXXRecordDecl *cxx_record_decl = llvm::dyn_cast<clang::CXXRecordDecl>(record_decl);
+                    if (cxx_record_decl)
+                    {
+                        auto method_iter = cxx_record_decl->method_begin();
+                        auto method_end = cxx_record_decl->method_end();
+                        if (idx < std::distance(method_iter, method_end))
+                        {
+                            std::advance(method_iter, idx);
+                            auto method_decl = method_iter->getCanonicalDecl();
+                            if (method_decl)
+                                return ClangASTType(m_ast,method_decl->getType().getAsOpaquePtr());
+                        }
+                    }
+                }
+                
+            default:
+                break;
+        }
+    }
+    
+    return ClangASTType();
+}
 
 ClangASTType
 ClangASTType::GetLValueReferenceType () const

lldb/test/python_api/class_members/Makefile

@@ -0,0 +1,5 @@
+LEVEL = ../../make
+
+CXX_SOURCES := main.cpp
+
+include $(LEVEL)/Makefile.rules

lldb/test/python_api/class_members/TestSBTypeClassMembers.py

@@ -0,0 +1,81 @@
+"""
+Test SBType and SBTypeList API.
+"""
+
+import os, time
+import re
+import unittest2
+import lldb, lldbutil
+from lldbtest import *
+
+class TypeAndTypeListTestCase(TestBase):
+
+    mydir = TestBase.compute_mydir(__file__)
+
+    @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
+    @python_api_test
+    @dsym_test
+    def test_with_dsym(self):
+        """Exercise SBType and SBTypeList API."""
+        d = {'EXE': self.exe_name}
+        self.buildDsym(dictionary=d)
+        self.setTearDownCleanup(dictionary=d)
+        self.type_api(self.exe_name)
+
+    @python_api_test
+    @dwarf_test
+    def test_with_dwarf(self):
+        """Exercise SBType and SBTypeList API."""
+        d = {'EXE': self.exe_name}
+        self.buildDwarf(dictionary=d)
+        self.setTearDownCleanup(dictionary=d)
+        self.type_api(self.exe_name)
+
+    def setUp(self):
+        # Call super's setUp().
+        TestBase.setUp(self)
+        # We'll use the test method name as the exe_name.
+        self.exe_name = self.testMethodName
+        # Find the line number to break at.
+        self.source = 'main.cpp'
+        self.line = line_number(self.source, '// set breakpoint here')
+
+    def type_api(self, exe_name):
+        """Exercise SBType and SBTypeList API."""
+        exe = os.path.join(os.getcwd(), exe_name)
+
+        # Create a target by the debugger.
+        target = self.dbg.CreateTarget(exe)
+        self.assertTrue(target, VALID_TARGET)
+
+        # Create the breakpoint inside function 'main'.
+        breakpoint = target.BreakpointCreateByLocation(self.source, self.line)
+        self.assertTrue(breakpoint, VALID_BREAKPOINT)
+
+        # Now launch the process, and do not stop at entry point.
+        process = target.LaunchSimple (None, None, self.get_process_working_directory())
+        self.assertTrue(process, PROCESS_IS_VALID)
+
+        # Get Frame #0.
+        self.assertTrue(process.GetState() == lldb.eStateStopped)
+        thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
+        self.assertTrue(thread.IsValid(), "There should be a thread stopped due to breakpoint condition")
+        frame0 = thread.GetFrameAtIndex(0)
+        
+        variable = frame0.FindVariable("d")
+        Derived = variable.GetType()
+        Base = Derived.GetDirectBaseClassAtIndex(0).GetType()
+
+        self.assertTrue(Derived.GetNumberOfMemberFunctions() == 2, "Derived declares two methods")
+        self.assertTrue(Derived.GetMemberFunctionAtIndex(0).GetFunctionReturnType().GetName() == "int", "Derived::dImpl returns int")
+        
+        self.assertTrue(Base.GetNumberOfMemberFunctions() == 4, "Base declares three methods")
+        self.assertTrue(Base.GetMemberFunctionAtIndex(3).GetFunctionArgumentTypes().GetSize() == 3, "Base::sfunc takes three arguments")
+        self.assertTrue(Base.GetMemberFunctionAtIndex(2).GetFunctionArgumentTypes().GetSize() == 0, "Base::dat takes no arguments")
+        self.assertTrue(Base.GetMemberFunctionAtIndex(1).GetFunctionArgumentTypes().GetTypeAtIndex(1).GetName() == "char", "Base::bar takes a second 'char' argument")
+
+if __name__ == '__main__':
+    import atexit
+    lldb.SBDebugger.Initialize()
+    atexit.register(lambda: lldb.SBDebugger.Terminate())
+    unittest2.main()

lldb/test/python_api/class_members/main.cpp

@@ -0,0 +1,28 @@
+//===-- main.cpp ------------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+class Base {
+public:
+    int foo(int x, int y) { return 1; }
+    char bar(int x, char y) { return 2; }
+    void dat() {}
+    static int sfunc(char, int, float) { return 3; }
+};
+
+class Derived: public Base {
+protected:
+    int dImpl() { return 1; }
+public:
+    float baz(float b) { return b + 1.0; }
+};
+
+int main() {
+    Derived d;
+    return 0; // set breakpoint here
+}