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2946cd701067404b99c39fb29dc9c74bd7193eb3
clang-p2996/lldb/source/Expression/ExpressionSourceCode.cpp
Chandler Carruth 2946cd7010 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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//===-- ExpressionSourceCode.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 "lldb/Expression/ExpressionSourceCode.h"
#include "Plugins/ExpressionParser/Clang/ClangModulesDeclVendor.h"
#include "Plugins/ExpressionParser/Clang/ClangPersistentVariables.h"
#include "lldb/Symbol/Block.h"
#include "lldb/Symbol/CompileUnit.h"
#include "lldb/Symbol/DebugMacros.h"
#include "lldb/Symbol/TypeSystem.h"
#include "lldb/Symbol/VariableList.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Language.h"
#include "lldb/Target/Platform.h"
#include "lldb/Target/StackFrame.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/StreamString.h"
using namespace lldb_private;
const char *ExpressionSourceCode::g_expression_prefix = R"(
#ifndef NULL
#define NULL (__null)
#endif
#ifndef Nil
#define Nil (__null)
#endif
#ifndef nil
#define nil (__null)
#endif
#ifndef YES
#define YES ((BOOL)1)
#endif
#ifndef NO
#define NO ((BOOL)0)
#endif
typedef __INT8_TYPE__ int8_t;
typedef __UINT8_TYPE__ uint8_t;
typedef __INT16_TYPE__ int16_t;
typedef __UINT16_TYPE__ uint16_t;
typedef __INT32_TYPE__ int32_t;
typedef __UINT32_TYPE__ uint32_t;
typedef __INT64_TYPE__ int64_t;
typedef __UINT64_TYPE__ uint64_t;
typedef __INTPTR_TYPE__ intptr_t;
typedef __UINTPTR_TYPE__ uintptr_t;
typedef __SIZE_TYPE__ size_t;
typedef __PTRDIFF_TYPE__ ptrdiff_t;
typedef unsigned short unichar;
extern "C"
{
int printf(const char * __restrict, ...);
}
)";
static const char *c_start_marker = " /*LLDB_BODY_START*/\n ";
static const char *c_end_marker = ";\n /*LLDB_BODY_END*/\n";
namespace {
class AddMacroState {
enum State {
CURRENT_FILE_NOT_YET_PUSHED,
CURRENT_FILE_PUSHED,
CURRENT_FILE_POPPED
};
public:
AddMacroState(const FileSpec &current_file, const uint32_t current_file_line)
: m_state(CURRENT_FILE_NOT_YET_PUSHED), m_current_file(current_file),
m_current_file_line(current_file_line) {}
void StartFile(const FileSpec &file) {
m_file_stack.push_back(file);
if (file == m_current_file)
m_state = CURRENT_FILE_PUSHED;
}
void EndFile() {
if (m_file_stack.size() == 0)
return;
FileSpec old_top = m_file_stack.back();
m_file_stack.pop_back();
if (old_top == m_current_file)
m_state = CURRENT_FILE_POPPED;
}
// An entry is valid if it occurs before the current line in the current
// file.
bool IsValidEntry(uint32_t line) {
switch (m_state) {
case CURRENT_FILE_NOT_YET_PUSHED:
return true;
case CURRENT_FILE_PUSHED:
// If we are in file included in the current file, the entry should be
// added.
if (m_file_stack.back() != m_current_file)
return true;
return line < m_current_file_line;
default:
return false;
}
}
private:
std::vector<FileSpec> m_file_stack;
State m_state;
FileSpec m_current_file;
uint32_t m_current_file_line;
};
} // anonymous namespace
static void AddMacros(const DebugMacros *dm, CompileUnit *comp_unit,
AddMacroState &state, StreamString &stream) {
if (dm == nullptr)
return;
for (size_t i = 0; i < dm->GetNumMacroEntries(); i++) {
const DebugMacroEntry &entry = dm->GetMacroEntryAtIndex(i);
uint32_t line;
switch (entry.GetType()) {
case DebugMacroEntry::DEFINE:
if (state.IsValidEntry(entry.GetLineNumber()))
stream.Printf("#define %s\n", entry.GetMacroString().AsCString());
else
return;
break;
case DebugMacroEntry::UNDEF:
if (state.IsValidEntry(entry.GetLineNumber()))
stream.Printf("#undef %s\n", entry.GetMacroString().AsCString());
else
return;
break;
case DebugMacroEntry::START_FILE:
line = entry.GetLineNumber();
if (state.IsValidEntry(line))
state.StartFile(entry.GetFileSpec(comp_unit));
else
return;
break;
case DebugMacroEntry::END_FILE:
state.EndFile();
break;
case DebugMacroEntry::INDIRECT:
AddMacros(entry.GetIndirectDebugMacros(), comp_unit, state, stream);
break;
default:
// This is an unknown/invalid entry. Ignore.
break;
}
}
}
static void AddLocalVariableDecls(const lldb::VariableListSP &var_list_sp,
StreamString &stream) {
for (size_t i = 0; i < var_list_sp->GetSize(); i++) {
lldb::VariableSP var_sp = var_list_sp->GetVariableAtIndex(i);
ConstString var_name = var_sp->GetName();
if (!var_name || var_name == ConstString("this") ||
var_name == ConstString(".block_descriptor"))
continue;
stream.Printf("using $__lldb_local_vars::%s;\n", var_name.AsCString());
}
}
bool ExpressionSourceCode::GetText(std::string &text,
lldb::LanguageType wrapping_language,
bool static_method,
ExecutionContext &exe_ctx) const {
const char *target_specific_defines = "typedef signed char BOOL;\n";
std::string module_macros;
Target *target = exe_ctx.GetTargetPtr();
if (target) {
if (target->GetArchitecture().GetMachine() == llvm::Triple::aarch64) {
target_specific_defines = "typedef bool BOOL;\n";
}
if (target->GetArchitecture().GetMachine() == llvm::Triple::x86_64) {
if (lldb::PlatformSP platform_sp = target->GetPlatform()) {
static ConstString g_platform_ios_simulator("ios-simulator");
if (platform_sp->GetPluginName() == g_platform_ios_simulator) {
target_specific_defines = "typedef bool BOOL;\n";
}
}
}
if (ClangModulesDeclVendor *decl_vendor =
target->GetClangModulesDeclVendor()) {
ClangPersistentVariables *persistent_vars =
llvm::cast<ClangPersistentVariables>(
target->GetPersistentExpressionStateForLanguage(
lldb::eLanguageTypeC));
const ClangModulesDeclVendor::ModuleVector &hand_imported_modules =
persistent_vars->GetHandLoadedClangModules();
ClangModulesDeclVendor::ModuleVector modules_for_macros;
for (ClangModulesDeclVendor::ModuleID module : hand_imported_modules) {
modules_for_macros.push_back(module);
}
if (target->GetEnableAutoImportClangModules()) {
if (StackFrame *frame = exe_ctx.GetFramePtr()) {
if (Block *block = frame->GetFrameBlock()) {
SymbolContext sc;
block->CalculateSymbolContext(&sc);
if (sc.comp_unit) {
StreamString error_stream;
decl_vendor->AddModulesForCompileUnit(
*sc.comp_unit, modules_for_macros, error_stream);
}
}
}
}
decl_vendor->ForEachMacro(
modules_for_macros,
[&module_macros](const std::string &expansion) -> bool {
module_macros.append(expansion);
module_macros.append("\n");
return false;
});
}
}
StreamString debug_macros_stream;
StreamString lldb_local_var_decls;
if (StackFrame *frame = exe_ctx.GetFramePtr()) {
const SymbolContext &sc = frame->GetSymbolContext(
lldb::eSymbolContextCompUnit | lldb::eSymbolContextLineEntry);
if (sc.comp_unit && sc.line_entry.IsValid()) {
DebugMacros *dm = sc.comp_unit->GetDebugMacros();
if (dm) {
AddMacroState state(sc.line_entry.file, sc.line_entry.line);
AddMacros(dm, sc.comp_unit, state, debug_macros_stream);
}
}
ConstString object_name;
if (Language::LanguageIsCPlusPlus(frame->GetLanguage())) {
if (target->GetInjectLocalVariables(&exe_ctx)) {
lldb::VariableListSP var_list_sp =
frame->GetInScopeVariableList(false, true);
AddLocalVariableDecls(var_list_sp, lldb_local_var_decls);
}
}
}
if (m_wrap) {
switch (wrapping_language) {
default:
return false;
case lldb::eLanguageTypeC:
case lldb::eLanguageTypeC_plus_plus:
case lldb::eLanguageTypeObjC:
break;
}
StreamString wrap_stream;
wrap_stream.Printf("%s\n%s\n%s\n%s\n%s\n", module_macros.c_str(),
debug_macros_stream.GetData(), g_expression_prefix,
target_specific_defines, m_prefix.c_str());
// First construct a tagged form of the user expression so we can find it
// later:
std::string tagged_body;
switch (wrapping_language) {
default:
tagged_body = m_body;
break;
case lldb::eLanguageTypeC:
case lldb::eLanguageTypeC_plus_plus:
case lldb::eLanguageTypeObjC:
tagged_body.append(c_start_marker);
tagged_body.append(m_body);
tagged_body.append(c_end_marker);
break;
}
switch (wrapping_language) {
default:
break;
case lldb::eLanguageTypeC:
wrap_stream.Printf("void \n"
"%s(void *$__lldb_arg) \n"
"{ \n"
" %s; \n"
"%s"
"} \n",
m_name.c_str(), lldb_local_var_decls.GetData(),
tagged_body.c_str());
break;
case lldb::eLanguageTypeC_plus_plus:
wrap_stream.Printf("void \n"
"$__lldb_class::%s(void *$__lldb_arg) \n"
"{ \n"
" %s; \n"
"%s"
"} \n",
m_name.c_str(), lldb_local_var_decls.GetData(),
tagged_body.c_str());
break;
case lldb::eLanguageTypeObjC:
if (static_method) {
wrap_stream.Printf(
"@interface $__lldb_objc_class ($__lldb_category) \n"
"+(void)%s:(void *)$__lldb_arg; \n"
"@end \n"
"@implementation $__lldb_objc_class ($__lldb_category) \n"
"+(void)%s:(void *)$__lldb_arg \n"
"{ \n"
"%s"
"} \n"
"@end \n",
m_name.c_str(), m_name.c_str(), tagged_body.c_str());
} else {
wrap_stream.Printf(
"@interface $__lldb_objc_class ($__lldb_category) \n"
"-(void)%s:(void *)$__lldb_arg; \n"
"@end \n"
"@implementation $__lldb_objc_class ($__lldb_category) \n"
"-(void)%s:(void *)$__lldb_arg \n"
"{ \n"
"%s"
"} \n"
"@end \n",
m_name.c_str(), m_name.c_str(), tagged_body.c_str());
}
break;
}
text = wrap_stream.GetString();
} else {
text.append(m_body);
}
return true;
}
bool ExpressionSourceCode::GetOriginalBodyBounds(
std::string transformed_text, lldb::LanguageType wrapping_language,
size_t &start_loc, size_t &end_loc) {
const char *start_marker;
const char *end_marker;
switch (wrapping_language) {
default:
return false;
case lldb::eLanguageTypeC:
case lldb::eLanguageTypeC_plus_plus:
case lldb::eLanguageTypeObjC:
start_marker = c_start_marker;
end_marker = c_end_marker;
break;
}
start_loc = transformed_text.find(start_marker);
if (start_loc == std::string::npos)
return false;
start_loc += strlen(start_marker);
end_loc = transformed_text.find(end_marker);
return end_loc != std::string::npos;
}
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