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//===-- SwiftSILManipulator.cpp ---------------------------------*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "SwiftSILManipulator.h"
#include "SwiftASTManipulator.h"
#include "lldb/Symbol/CompilerType.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
#include "swift/SIL/SILArgument.h"
#include "swift/SIL/SILBasicBlock.h"
#include "swift/SIL/SILBuilder.h"
#include "swift/SIL/SILFunction.h"
#include "swift/SIL/SILLocation.h"
#include "swift/SIL/SILModule.h"
#include "swift/SIL/SILType.h"
#include "swift/SIL/SILValue.h"
#include "swift/SIL/TypeLowering.h"
using namespace lldb_private;
SwiftSILManipulator::SwiftSILManipulator(swift::SILBuilder &builder)
: m_builder(builder), m_log(GetLog(LLDBLog::Expressions)) {}
swift::SILValue SwiftSILManipulator::emitLValueForVariable(
swift::VarDecl *var, SwiftExpressionParser::SILVariableInfo &info) {
swift::SILFunction &function = m_builder.getFunction();
swift::SILBasicBlock &entry_block = *function.getEntryBlock();
swift::SILArgument *struct_argument = nullptr;
for (swift::SILArgument *argument : entry_block.getArguments()) {
swift::Identifier argument_name = argument->getDecl()->getBaseName()
.getIdentifier();
if (!strcmp(argument_name.get(), SwiftASTManipulator::GetArgumentName())) {
struct_argument = argument;
break;
}
}
if (!struct_argument)
return swift::SILValue();
assert(struct_argument->getType().getAsString().find(
"UnsafeMutablePointer") != std::string::npos);
swift::CanType unsafe_mutable_pointer_can_type =
struct_argument->getType().getSwiftRValueType();
swift::BoundGenericStructType *unsafe_mutable_pointer_struct_type =
llvm::cast<swift::BoundGenericStructType>(
unsafe_mutable_pointer_can_type.getPointer());
swift::StructDecl *unsafe_mutable_pointer_struct_decl =
unsafe_mutable_pointer_struct_type->getDecl();
swift::VarDecl *value_member_decl = nullptr;
for (swift::Decl *member : unsafe_mutable_pointer_struct_decl->getMembers()) {
if (swift::VarDecl *member_var = llvm::dyn_cast<swift::VarDecl>(member)) {
if (member_var->getName().str().equals("_rawValue")) {
value_member_decl = member_var;
break;
}
}
}
if (!value_member_decl)
return swift::SILValue();
swift::ASTContext &ast_ctx = m_builder.getASTContext();
// FIXME: Creating a new TypeLowering every time is wasteful.
swift::Lowering::TypeConverter converter(*m_builder.getModule().getSwiftModule());
swift::SILLocation null_loc((swift::Decl *)nullptr);
swift::SILType raw_pointer_type = swift::SILType::getRawPointerType(ast_ctx);
swift::StructExtractInst *struct_extract = m_builder.createStructExtract(
null_loc, struct_argument, value_member_decl, raw_pointer_type);
swift::IntegerLiteralInst *integer_literal = m_builder.createIntegerLiteral(
null_loc, swift::SILType::getBuiltinIntegerType(64, ast_ctx),
(intmax_t)info.offset);
swift::IndexRawPointerInst *index_raw_pointer =
m_builder.createIndexRawPointer(null_loc, struct_extract,
integer_literal);
swift::PointerToAddressInst *pointer_to_return_slot =
m_builder.createPointerToAddress(null_loc, index_raw_pointer,
raw_pointer_type.getAddressType(),
/*isStrict*/ true);
swift::LoadInst *pointer_to_variable =
m_builder.createLoad(null_loc, pointer_to_return_slot,
swift::LoadOwnershipQualifier::Trivial);
auto type = var->getDeclContext()->mapTypeIntoContext(
var->getInterfaceType());
auto loweredType = converter.getLoweredRValueType(
swift::TypeExpansionContext::minimal(), type);
// The fact that self is unowned is not preserved in the inner
// lldb_expr function. By casting the value to $*@sil_unowned ...
// SILGen emits a load_unowned instead of a load and the unwrapped
// self is passed to the lldb_expr.
swift::CanType var_type = loweredType;
if (info.is_unowned_self)
var_type = swift::ReferenceStorageType::get(
loweredType, swift::ReferenceOwnership::Unowned, ast_ctx)
->getCanonicalType();
swift::PointerToAddressInst *address_of_variable =
m_builder.createPointerToAddress(
null_loc, pointer_to_variable,
swift::SILType::getPrimitiveAddressType(var_type),
/*isStrict*/ true);
if (info.needs_init) {
info.needs_init = false;
return swift::SILValue(m_builder.createMarkUninitialized(
null_loc, address_of_variable, swift::MarkUninitializedInst::Var));
} else
return swift::SILValue(address_of_variable);
}
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