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//===-- GoLanguageRuntime.cpp --------------------------------------*- C++
//-*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "GoLanguageRuntime.h"
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Scalar.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Core/ValueObjectMemory.h"
#include "lldb/Symbol/GoASTContext.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Symbol/SymbolFile.h"
#include "lldb/Symbol/TypeList.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/SectionLoadList.h"
#include "lldb/Target/StopInfo.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Utility/ConstString.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/Status.h"
#include "llvm/ADT/Twine.h"
#include <vector>
using namespace lldb;
using namespace lldb_private;
namespace {
ValueObjectSP GetChild(ValueObject &obj, const char *name,
bool dereference = true) {
ConstString name_const_str(name);
ValueObjectSP result = obj.GetChildMemberWithName(name_const_str, true);
if (dereference && result && result->IsPointerType()) {
Status err;
result = result->Dereference(err);
if (err.Fail())
result.reset();
}
return result;
}
ConstString ReadString(ValueObject &str, Process *process) {
ConstString result;
ValueObjectSP data = GetChild(str, "str", false);
ValueObjectSP len = GetChild(str, "len");
if (len && data) {
Status err;
lldb::addr_t addr = data->GetPointerValue();
if (addr == LLDB_INVALID_ADDRESS)
return result;
uint64_t byte_size = len->GetValueAsUnsigned(0);
char *buf = new char[byte_size + 1];
buf[byte_size] = 0;
size_t bytes_read = process->ReadMemory(addr, buf, byte_size, err);
if (!(err.Fail() || bytes_read != byte_size))
result = ConstString(buf, bytes_read);
delete[] buf;
}
return result;
}
ConstString ReadTypeName(ValueObjectSP type, Process *process) {
if (ValueObjectSP uncommon = GetChild(*type, "x")) {
ValueObjectSP name = GetChild(*uncommon, "name");
ValueObjectSP package = GetChild(*uncommon, "pkgpath");
if (name && name->GetPointerValue() != 0 && package &&
package->GetPointerValue() != 0) {
ConstString package_const_str = ReadString(*package, process);
ConstString name_const_str = ReadString(*name, process);
if (package_const_str.GetLength() == 0)
return name_const_str;
return ConstString((package_const_str.GetStringRef() + "." +
name_const_str.GetStringRef())
.str());
}
}
ValueObjectSP name = GetChild(*type, "_string");
if (name)
return ReadString(*name, process);
return ConstString("");
}
CompilerType LookupRuntimeType(ValueObjectSP type, ExecutionContext *exe_ctx,
bool *is_direct) {
uint8_t kind = GetChild(*type, "kind")->GetValueAsUnsigned(0);
*is_direct = GoASTContext::IsDirectIface(kind);
if (GoASTContext::IsPointerKind(kind)) {
CompilerType type_ptr = type->GetCompilerType().GetPointerType();
Status err;
ValueObjectSP elem =
type->CreateValueObjectFromAddress("elem", type->GetAddressOf() +
type->GetByteSize(),
*exe_ctx, type_ptr)
->Dereference(err);
if (err.Fail())
return CompilerType();
bool tmp_direct;
return LookupRuntimeType(elem, exe_ctx, &tmp_direct).GetPointerType();
}
Target *target = exe_ctx->GetTargetPtr();
Process *process = exe_ctx->GetProcessPtr();
ConstString const_typename = ReadTypeName(type, process);
if (const_typename.GetLength() == 0)
return CompilerType();
SymbolContext sc;
TypeList type_list;
llvm::DenseSet<SymbolFile *> searched_symbol_files;
uint32_t num_matches = target->GetImages().FindTypes(
sc, const_typename, false, 2, searched_symbol_files, type_list);
if (num_matches > 0) {
return type_list.GetTypeAtIndex(0)->GetFullCompilerType();
}
return CompilerType();
}
}
bool GoLanguageRuntime::CouldHaveDynamicValue(ValueObject &in_value) {
return GoASTContext::IsGoInterface(in_value.GetCompilerType());
}
bool GoLanguageRuntime::GetDynamicTypeAndAddress(
ValueObject &in_value, lldb::DynamicValueType use_dynamic,
TypeAndOrName &class_type_or_name, Address &dynamic_address,
Value::ValueType &value_type) {
value_type = Value::eValueTypeScalar;
class_type_or_name.Clear();
if (CouldHaveDynamicValue(in_value)) {
Status err;
ValueObjectSP iface = in_value.GetStaticValue();
ValueObjectSP data_sp = GetChild(*iface, "data", false);
if (!data_sp)
return false;
if (ValueObjectSP tab = GetChild(*iface, "tab"))
iface = tab;
ValueObjectSP type = GetChild(*iface, "_type");
if (!type) {
return false;
}
bool direct;
ExecutionContext exe_ctx(in_value.GetExecutionContextRef());
CompilerType final_type = LookupRuntimeType(type, &exe_ctx, &direct);
if (!final_type)
return false;
if (direct) {
class_type_or_name.SetCompilerType(final_type);
} else {
// TODO: implement reference types or fix caller to support dynamic types
// that aren't pointers
// so we don't have to introduce this extra pointer.
class_type_or_name.SetCompilerType(final_type.GetPointerType());
}
dynamic_address.SetLoadAddress(data_sp->GetPointerValue(),
exe_ctx.GetTargetPtr());
return true;
}
return false;
}
TypeAndOrName
GoLanguageRuntime::FixUpDynamicType(const TypeAndOrName &type_and_or_name,
ValueObject &static_value) {
return type_and_or_name;
}
//------------------------------------------------------------------
// Static Functions
//------------------------------------------------------------------
LanguageRuntime *
GoLanguageRuntime::CreateInstance(Process *process,
lldb::LanguageType language) {
if (language == eLanguageTypeGo)
return new GoLanguageRuntime(process);
else
return NULL;
}
void GoLanguageRuntime::Initialize() {
PluginManager::RegisterPlugin(GetPluginNameStatic(), "Go Language Runtime",
CreateInstance);
}
void GoLanguageRuntime::Terminate() {
PluginManager::UnregisterPlugin(CreateInstance);
}
lldb_private::ConstString GoLanguageRuntime::GetPluginNameStatic() {
static ConstString g_name("golang");
return g_name;
}
//------------------------------------------------------------------
// PluginInterface protocol
//------------------------------------------------------------------
lldb_private::ConstString GoLanguageRuntime::GetPluginName() {
return GetPluginNameStatic();
}
uint32_t GoLanguageRuntime::GetPluginVersion() { return 1; }
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