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#include "llvm/DerivedTypes.h"
#include "aggregate.h"
#include "declaration.h"
#include "init.h"
#include "mtype.h"
#include "gen/irstate.h"
#include "gen/tollvm.h"
#include "gen/logger.h"
#include "gen/utils.h"
#include "gen/llvmhelpers.h"
#include "ir/irtypestruct.h"
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
IrTypeAggr::IrTypeAggr(AggregateDeclaration * ad)
: IrType(ad->type, LLStructType::create(gIR->context(), ad->toPrettyChars())),
aggr(ad)
{
}
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
IrTypeStruct::IrTypeStruct(StructDeclaration * sd)
: IrTypeAggr(sd),
sd(sd),
ts(static_cast<TypeStruct*>(sd->type))
{
}
//////////////////////////////////////////////////////////////////////////////
size_t add_zeros(std::vector<llvm::Type*>& defaultTypes, size_t diff)
{
size_t n = defaultTypes.size();
while (diff)
{
if (global.params.is64bit && diff % 8 == 0)
{
defaultTypes.push_back(llvm::Type::getInt64Ty(gIR->context()));
diff -= 8;
}
else if (diff % 4 == 0)
{
defaultTypes.push_back(llvm::Type::getInt32Ty(gIR->context()));
diff -= 4;
}
else if (diff % 2 == 0)
{
defaultTypes.push_back(llvm::Type::getInt16Ty(gIR->context()));
diff -= 2;
}
else
{
defaultTypes.push_back(llvm::Type::getInt8Ty(gIR->context()));
diff -= 1;
}
}
return defaultTypes.size() - n;
}
bool var_offset_sort_cb(const VarDeclaration* v1, const VarDeclaration* v2)
{
if (v1 && v2)
return v1->offset < v2->offset;
// sort NULL pointers towards the end
return v1 && !v2;
}
// this is pretty much the exact same thing we need to do for fields in each
// base class of a class
llvm::Type* IrTypeStruct::buildType()
{
IF_LOG Logger::println("Building struct type %s @ %s",
sd->toPrettyChars(), sd->loc.toChars());
LOG_SCOPE;
// if it's a forward declaration, all bets are off, stick with the opaque
if (sd->sizeok != 1)
return type;
// mirror the sd->fields array but only fill in contributors
size_t n = sd->fields.dim;
LLSmallVector<VarDeclaration*, 16> data(n, NULL);
default_fields.reserve(n);
// first fill in the fields with explicit initializers
VarDeclarationIter field_it(sd->fields);
for (; field_it.more(); field_it.next())
{
// init is !null for explicit inits
if (field_it->init != NULL && !field_it->init->isVoidInitializer())
{
IF_LOG Logger::println("adding explicit initializer for struct field %s",
field_it->toChars());
data[field_it.index] = *field_it;
size_t f_begin = field_it->offset;
size_t f_end = f_begin + field_it->type->size();
// make sure there is no overlap
for (size_t i = 0; i < field_it.index; i++)
{
if (data[i] != NULL)
{
VarDeclaration* vd = data[i];
size_t v_begin = vd->offset;
size_t v_end = v_begin + vd->type->size();
if (v_begin >= f_end || v_end <= f_begin)
continue;
sd->error(vd->loc, "has overlapping initialization for %s and %s",
field_it->toChars(), vd->toChars());
}
}
}
}
if (global.errors)
{
fatal();
}
// fill in default initializers
field_it = VarDeclarationIter(sd->fields);
for (;field_it.more(); field_it.next())
{
if (data[field_it.index])
continue;
size_t f_begin = field_it->offset;
size_t f_end = f_begin + field_it->type->size();
// make sure it doesn't overlap anything explicit
bool overlaps = false;
for (size_t i = 0; i < n; i++)
{
if (data[i])
{
size_t v_begin = data[i]->offset;
size_t v_end = v_begin + data[i]->type->size();
if (v_begin >= f_end || v_end <= f_begin)
continue;
overlaps = true;
break;
}
}
// if no overlap was found, add the default initializer
if (!overlaps)
{
IF_LOG Logger::println("adding default initializer for struct field %s",
field_it->toChars());
data[field_it.index] = *field_it;
}
}
// ok. now we can build a list of llvm types. and make sure zeros are inserted if necessary.
std::vector<LLType*> defaultTypes;
defaultTypes.reserve(16);
size_t offset = 0;
size_t field_index = 0;
bool packed = (sd->type->alignsize() == 1);
// first we sort the list by offset
std::sort(data.begin(), data.end(), var_offset_sort_cb);
// add types to list
for (size_t i = 0; i < n; i++)
{
VarDeclaration* vd = data[i];
if (vd == NULL)
continue;
assert(vd->offset >= offset);
// add to default field list
default_fields.push_back(vd);
// get next aligned offset for this type
size_t alignedoffset = offset;
if (!packed)
{
alignedoffset = realignOffset(alignedoffset, vd->type);
}
// insert explicit padding?
if (alignedoffset < vd->offset)
{
field_index += add_zeros(defaultTypes, vd->offset - alignedoffset);
}
// add default type
defaultTypes.push_back(DtoType(vd->type));
// advance offset to right past this field
offset = vd->offset + vd->type->size();
// set the field index
vd->aggrIndex = (unsigned)field_index++;
}
// tail padding?
if (offset < sd->structsize)
{
add_zeros(defaultTypes, sd->structsize - offset);
}
// set struct body
isaStruct(type)->setBody(defaultTypes, packed);
IF_LOG Logger::cout() << "final struct type: " << type << std::endl;
return type;
}
//////////////////////////////////////////////////////////////////////////////
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