mirror of
https://github.com/xomboverlord/ldc.git
synced 2026-01-11 02:06:35 +01:00
0a96aea868
1. Main include corresponding to .cpp file, if any. 2. DMD and LDC includes. 3. LLVM includes. 4. System includes. Also updated a few include guards to match the default format.
412 lines
12 KiB
C++
412 lines
12 KiB
C++
//===-- irstruct.cpp ------------------------------------------------------===//
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//
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// LDC – the LLVM D compiler
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//
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// This file is distributed under the BSD-style LDC license. See the LICENSE
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// file for details.
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//
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//===----------------------------------------------------------------------===//
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#include "gen/llvm.h"
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#include "aggregate.h"
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#include "declaration.h"
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#include "init.h"
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#include "mtype.h"
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#include "gen/irstate.h"
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#include "gen/llvmhelpers.h"
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#include "gen/logger.h"
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#include "gen/tollvm.h"
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#include "gen/utils.h"
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#include "ir/irstruct.h"
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#include "ir/irtypeclass.h"
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#include <algorithm>
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//////////////////////////////////////////////////////////////////////////////
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IrStruct::IrStruct(AggregateDeclaration* aggr)
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: diCompositeType(NULL),
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init_type(LLStructType::create(gIR->context(), std::string(aggr->toPrettyChars()) + "_init"))
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{
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aggrdecl = aggr;
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type = aggr->type;
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packed = (type->ty == Tstruct)
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? type->alignsize() == 1
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: false;
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// above still need to be looked at
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init = NULL;
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constInit = NULL;
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vtbl = NULL;
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constVtbl = NULL;
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classInfo = NULL;
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constClassInfo = NULL;
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classInterfacesArray = NULL;
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}
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//////////////////////////////////////////////////////////////////////////////
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LLGlobalVariable * IrStruct::getInitSymbol()
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{
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if (init)
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return init;
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// create the initZ symbol
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std::string initname("_D");
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initname.append(aggrdecl->mangle());
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initname.append("6__initZ");
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llvm::GlobalValue::LinkageTypes _linkage = DtoExternalLinkage(aggrdecl);
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init = new llvm::GlobalVariable(
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*gIR->module, init_type, true, _linkage, NULL, initname);
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// set alignment
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init->setAlignment(type->alignsize());
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#if DMDV2
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StructDeclaration *sd = aggrdecl->isStructDeclaration();
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if (sd && sd->alignment != STRUCTALIGN_DEFAULT)
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init->setAlignment(sd->alignment);
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#endif
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return init;
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}
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//////////////////////////////////////////////////////////////////////////////
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llvm::Constant * IrStruct::getDefaultInit()
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{
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if (constInit)
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return constInit;
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std::vector<LLConstant*> constants = type->ty == Tstruct ?
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createStructDefaultInitializer() :
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createClassDefaultInitializer();
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// set initializer type body
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std::vector<LLType*> types;
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std::vector<LLConstant*>::iterator itr = constants.begin(), end = constants.end();
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for (; itr != end; ++itr)
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types.push_back((*itr)->getType());
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init_type->setBody(types, packed);
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// build constant struct
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constInit = LLConstantStruct::get(init_type, constants);
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IF_LOG Logger::cout() << "final default initializer: " << *constInit << std::endl;
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return constInit;
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}
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//////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////
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// helper function that returns the static default initializer of a variable
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LLConstant* get_default_initializer(VarDeclaration* vd, Initializer* init)
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{
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if (init)
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{
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return DtoConstInitializer(init->loc, vd->type, init);
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}
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else if (vd->init)
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{
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return DtoConstInitializer(vd->init->loc, vd->type, vd->init);
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}
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else
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{
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return DtoConstExpInit(vd->loc, vd->type, vd->type->defaultInit(vd->loc));
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}
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}
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// helper function that adds zero bytes to a vector of constants
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size_t add_zeros(std::vector<llvm::Constant*>& constants, size_t diff)
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{
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size_t n = constants.size();
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while (diff)
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{
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if (global.params.is64bit && diff % 8 == 0)
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{
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constants.push_back(LLConstant::getNullValue(llvm::Type::getInt64Ty(gIR->context())));
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diff -= 8;
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}
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else if (diff % 4 == 0)
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{
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constants.push_back(LLConstant::getNullValue(llvm::Type::getInt32Ty(gIR->context())));
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diff -= 4;
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}
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else if (diff % 2 == 0)
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{
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constants.push_back(LLConstant::getNullValue(llvm::Type::getInt16Ty(gIR->context())));
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diff -= 2;
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}
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else
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{
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constants.push_back(LLConstant::getNullValue(llvm::Type::getInt8Ty(gIR->context())));
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diff -= 1;
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}
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}
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return constants.size() - n;
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}
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// Matches the way the type is built in IrTypeStruct
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// maybe look at unifying the interface.
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std::vector<llvm::Constant*> IrStruct::createStructDefaultInitializer()
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{
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IF_LOG Logger::println("Building default initializer for %s", aggrdecl->toPrettyChars());
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LOG_SCOPE;
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assert(type->ty == Tstruct && "cannot build struct default initializer for non struct type");
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DtoType(type);
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IrTypeStruct* ts = stripModifiers(type)->irtype->isStruct();
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assert(ts);
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// start at offset zero
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size_t offset = 0;
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// vector of constants
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std::vector<llvm::Constant*> constants;
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// go through fields
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IrTypeAggr::iterator it;
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for (it = ts->def_begin(); it != ts->def_end(); ++it)
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{
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VarDeclaration* vd = *it;
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assert(vd->offset >= offset && "default fields not sorted by offset");
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IF_LOG Logger::println("using field: %s %s (+%u)", vd->type->toChars(), vd->toChars(), vd->offset);
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// get next aligned offset for this field
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size_t alignedoffset = offset;
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if (!packed)
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{
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alignedoffset = realignOffset(alignedoffset, vd->type);
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}
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// insert explicit padding?
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if (alignedoffset < vd->offset)
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{
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add_zeros(constants, vd->offset - alignedoffset);
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}
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// add initializer
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constants.push_back(get_default_initializer(vd, NULL));
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// advance offset to right past this field
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offset = vd->offset + vd->type->size();
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}
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// tail padding?
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if (offset < aggrdecl->structsize)
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{
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add_zeros(constants, aggrdecl->structsize - offset);
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}
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return constants;
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}
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//////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////
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// yet another rewrite of the notorious StructInitializer.
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typedef std::pair<VarDeclaration*, llvm::Constant*> VCPair;
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bool struct_init_data_sort(const VCPair& a, const VCPair& b)
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{
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return (a.first && b.first)
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? a.first->offset < b.first->offset
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: false;
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}
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// this time a bit more inspired by the DMD code.
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LLConstant * IrStruct::createStructInitializer(StructInitializer * si)
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{
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IF_LOG Logger::println("Building StructInitializer of type %s", si->ad->toPrettyChars());
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LOG_SCOPE;
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// sanity check
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assert(si->ad == aggrdecl && "struct type mismatch");
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assert(si->vars.dim == si->value.dim && "inconsistent StructInitializer");
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// array of things to build
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llvm::SmallVector<VCPair, 16> data(aggrdecl->fields.dim);
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// start by creating a map from initializer indices to field indices.
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// I have no fucking clue why dmd represents it like this :/
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size_t n = si->vars.dim;
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LLSmallVector<int, 16> datamap(n, 0);
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for (size_t i = 0; i < n; i++)
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{
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for (size_t j = 0; 1; j++)
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{
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assert(j < aggrdecl->fields.dim);
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if (aggrdecl->fields.data[j] == si->vars.data[i])
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{
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datamap[i] = j;
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break;
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}
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}
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}
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// fill in explicit initializers
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n = si->vars.dim;
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for (size_t i = 0; i < n; i++)
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{
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VarDeclaration* vd = static_cast<VarDeclaration*>(si->vars.data[i]);
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Initializer* ini = static_cast<Initializer*>(si->value.data[i]);
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Loc loc = ini ? ini->loc : si->loc;
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size_t idx = datamap[i];
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// check for duplicate initialization
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if (data[idx].first != NULL)
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{
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Loc l = ini ? ini->loc : si->loc;
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error(l, "duplicate initialization of %s", vd->toChars());
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continue;
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}
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// check for overlapping initialization
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for (size_t j = 0; j < i; j++)
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{
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size_t idx2 = datamap[j];
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assert(data[idx2].first);
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VarDeclarationIter it(aggrdecl->fields, idx2);
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unsigned f_begin = it->offset;
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unsigned f_end = f_begin + it->type->size();
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if (vd->offset >= f_end || (vd->offset + vd->type->size()) <= f_begin)
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continue;
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error(loc, "initializer for %s overlaps previous initialization of %s", vd->toChars(), it->toChars());
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}
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IF_LOG Logger::println("Explicit initializer: %s @+%u", vd->toChars(), vd->offset);
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LOG_SCOPE;
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data[idx].first = vd;
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data[idx].second = get_default_initializer(vd, ini);
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}
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// fill in implicit initializers
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n = data.size();
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for (size_t i = 0; i < n; i++)
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{
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VarDeclaration* vd = data[i].first;
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if (vd)
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continue;
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vd = static_cast<VarDeclaration*>(aggrdecl->fields.data[i]);
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unsigned vd_begin = vd->offset;
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unsigned vd_end = vd_begin + vd->type->size();
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// make sure it doesn't overlap any explicit initializers.
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VarDeclarationIter it(aggrdecl->fields);
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bool overlaps = false;
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size_t j = 0;
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for (; it.more(); it.next(), j++)
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{
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if (i == j || !data[j].first)
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continue;
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unsigned f_begin = it->offset;
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unsigned f_end = f_begin + it->type->size();
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if (vd_begin >= f_end || vd_end <= f_begin)
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continue;
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overlaps = true;
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break;
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}
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// add if no overlap found
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if (!overlaps)
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{
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IF_LOG Logger::println("Implicit initializer: %s @+%u", vd->toChars(), vd->offset);
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LOG_SCOPE;
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data[i].first = vd;
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data[i].second = get_default_initializer(vd, NULL);
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}
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}
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// stop if there were errors
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if (global.errors)
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{
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fatal();
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}
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// sort data array by offset
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std::sort(data.begin(), data.end(), struct_init_data_sort);
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// build array of constants and make sure explicit zero padding is inserted when necessary.
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size_t offset = 0;
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std::vector<llvm::Constant*> constants;
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constants.reserve(n);
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for (size_t i = 0; i < n; i++)
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{
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VarDeclaration* vd = data[i].first;
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if (vd == NULL)
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continue;
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// get next aligned offset for this field
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size_t alignedoffset = offset;
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if (!packed)
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{
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alignedoffset = realignOffset(alignedoffset, vd->type);
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}
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// insert explicit padding?
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if (alignedoffset < vd->offset)
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{
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size_t diff = vd->offset - alignedoffset;
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IF_LOG Logger::println("adding %zu bytes zero padding", diff);
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add_zeros(constants, diff);
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}
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IF_LOG Logger::println("adding field %s", vd->toChars());
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constants.push_back(data[i].second);
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offset = vd->offset + vd->type->size();
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}
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// tail padding?
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if (offset < aggrdecl->structsize)
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{
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size_t diff = aggrdecl->structsize - offset;
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IF_LOG Logger::println("adding %zu bytes zero padding", diff);
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add_zeros(constants, diff);
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}
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// get initializer type
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LLStructType* <ype = si->ltype;
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if (!ltype || ltype->isOpaque()) {
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std::vector<LLConstant*>::iterator itr, end = constants.end();
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std::vector<LLType*> types;
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for (itr = constants.begin(); itr != end; ++itr)
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types.push_back((*itr)->getType());
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if (!ltype)
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ltype = LLStructType::get(gIR->context(), types, packed);
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else
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ltype->setBody(types, packed);
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}
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// build constant
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assert(!constants.empty());
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llvm::Constant* c = LLConstantStruct::get(ltype, constants);
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IF_LOG Logger::cout() << "final struct initializer: " << *c << std::endl;
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return c;
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}
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