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| //===-- ASTStructExtractor.cpp ----------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "ASTStructExtractor.h"
#include "lldb/Utility/Log.h"
#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"
using namespace llvm;
using namespace clang;
using namespace lldb_private;
ASTStructExtractor::ASTStructExtractor(ASTConsumer *passthrough,
const char *struct_name,
ClangFunctionCaller &function)
: m_ast_context(nullptr), m_passthrough(passthrough),
m_passthrough_sema(nullptr), m_sema(nullptr), m_action(nullptr),
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 = nullptr;
StringRef desired_name(m_struct_name);
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())) {
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) {
if (m_passthrough)
m_passthrough->HandleVTable(RD);
}
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 = nullptr;
m_action = nullptr;
if (m_passthrough_sema)
m_passthrough_sema->ForgetSema();
}
|