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//===-- ASTStructExtractor.cpp ----------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "stdlib.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclGroup.h"
#include "clang/AST/Expr.h"
#include "clang/AST/RecordLayout.h"
#include "clang/AST/Stmt.h"
#include "clang/Parse/Parser.h"
#include "clang/Sema/Sema.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/raw_ostream.h"
#include "lldb/Core/Log.h"
#include "lldb/Expression/ASTStructExtractor.h"
using namespace llvm;
using namespace clang;
using namespace lldb_private;
ASTStructExtractor::ASTStructExtractor(ASTConsumer *passthrough,
const char *struct_name,
ClangFunction &function) :
m_ast_context (NULL),
m_passthrough (passthrough),
m_passthrough_sema (NULL),
m_sema (NULL),
m_action (NULL),
m_function (function),
m_struct_name (struct_name)
{
if (!m_passthrough)
return;
m_passthrough_sema = dyn_cast<SemaConsumer>(passthrough);
}
ASTStructExtractor::~ASTStructExtractor()
{
}
void
ASTStructExtractor::Initialize(ASTContext &Context)
{
m_ast_context = &Context;
if (m_passthrough)
m_passthrough->Initialize(Context);
}
void
ASTStructExtractor::ExtractFromFunctionDecl(FunctionDecl *F)
{
if (!F->hasBody())
return;
Stmt *body_stmt = F->getBody();
CompoundStmt *body_compound_stmt = dyn_cast<CompoundStmt>(body_stmt);
if (!body_compound_stmt)
return; // do we have to handle this?
RecordDecl *struct_decl = NULL;
StringRef desired_name(m_struct_name.c_str());
for (CompoundStmt::const_body_iterator bi = body_compound_stmt->body_begin(), be = body_compound_stmt->body_end();
bi != be;
++bi)
{
Stmt *curr_stmt = *bi;
DeclStmt *curr_decl_stmt = dyn_cast<DeclStmt>(curr_stmt);
if (!curr_decl_stmt)
continue;
DeclGroupRef decl_group = curr_decl_stmt->getDeclGroup();
for (Decl *candidate_decl : decl_group)
{
RecordDecl *candidate_record_decl = dyn_cast<RecordDecl>(candidate_decl);
if (!candidate_record_decl)
continue;
if (candidate_record_decl->getName() == desired_name)
{
struct_decl = candidate_record_decl;
break;
}
}
if (struct_decl)
break;
}
if (!struct_decl)
return;
const ASTRecordLayout* struct_layout(&m_ast_context->getASTRecordLayout (struct_decl));
if (!struct_layout)
return;
m_function.m_struct_size = struct_layout->getSize().getQuantity(); // TODO Store m_struct_size as CharUnits
m_function.m_return_offset = struct_layout->getFieldOffset(struct_layout->getFieldCount() - 1) / 8;
m_function.m_return_size = struct_layout->getDataSize().getQuantity() - m_function.m_return_offset;
for (unsigned field_index = 0, num_fields = struct_layout->getFieldCount();
field_index < num_fields;
++field_index)
{
m_function.m_member_offsets.push_back(struct_layout->getFieldOffset(field_index) / 8);
}
m_function.m_struct_valid = true;
}
void
ASTStructExtractor::ExtractFromTopLevelDecl(Decl* D)
{
LinkageSpecDecl *linkage_spec_decl = dyn_cast<LinkageSpecDecl>(D);
if (linkage_spec_decl)
{
RecordDecl::decl_iterator decl_iterator;
for (decl_iterator = linkage_spec_decl->decls_begin();
decl_iterator != linkage_spec_decl->decls_end();
++decl_iterator)
{
ExtractFromTopLevelDecl(*decl_iterator);
}
}
FunctionDecl *function_decl = dyn_cast<FunctionDecl>(D);
if (m_ast_context &&
function_decl &&
!m_function.m_wrapper_function_name.compare(function_decl->getNameAsString().c_str()))
{
ExtractFromFunctionDecl(function_decl);
}
}
bool
ASTStructExtractor::HandleTopLevelDecl(DeclGroupRef D)
{
DeclGroupRef::iterator decl_iterator;
for (decl_iterator = D.begin();
decl_iterator != D.end();
++decl_iterator)
{
Decl *decl = *decl_iterator;
ExtractFromTopLevelDecl(decl);
}
if (m_passthrough)
return m_passthrough->HandleTopLevelDecl(D);
return true;
}
void
ASTStructExtractor::HandleTranslationUnit(ASTContext &Ctx)
{
if (m_passthrough)
m_passthrough->HandleTranslationUnit(Ctx);
}
void
ASTStructExtractor::HandleTagDeclDefinition(TagDecl *D)
{
if (m_passthrough)
m_passthrough->HandleTagDeclDefinition(D);
}
void
ASTStructExtractor::CompleteTentativeDefinition(VarDecl *D)
{
if (m_passthrough)
m_passthrough->CompleteTentativeDefinition(D);
}
void
ASTStructExtractor::HandleVTable(CXXRecordDecl *RD, bool DefinitionRequired)
{
if (m_passthrough)
m_passthrough->HandleVTable(RD, DefinitionRequired);
}
void
ASTStructExtractor::PrintStats()
{
if (m_passthrough)
m_passthrough->PrintStats();
}
void
ASTStructExtractor::InitializeSema(Sema &S)
{
m_sema = &S;
m_action = reinterpret_cast<Action*>(m_sema);
if (m_passthrough_sema)
m_passthrough_sema->InitializeSema(S);
}
void
ASTStructExtractor::ForgetSema()
{
m_sema = NULL;
m_action = NULL;
if (m_passthrough_sema)
m_passthrough_sema->ForgetSema();
}
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