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//===-- structs.cpp -------------------------------------------------------===//
//
// LDC – the LLVM D compiler
//
// This file is distributed under the BSD-style LDC license. See the LICENSE
// file for details.
//
//===----------------------------------------------------------------------===//
#include "gen/structs.h"
#include "dmd/aggregate.h"
#include "dmd/declaration.h"
#include "dmd/errors.h"
#include "dmd/init.h"
#include "dmd/module.h"
#include "dmd/mtype.h"
#include "gen/arrays.h"
#include "gen/dvalue.h"
#include "gen/functions.h"
#include "gen/irstate.h"
#include "gen/llvm.h"
#include "gen/llvmhelpers.h"
#include "gen/logger.h"
#include "gen/tollvm.h"
#include "ir/iraggr.h"
#include "ir/irdsymbol.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/Support/ManagedStatic.h"
#include <algorithm>
////////////////////////////////////////////////////////////////////////////////
void DtoResolveStruct(StructDeclaration *sd) { DtoResolveStruct(sd, sd->loc); }
void DtoResolveStruct(StructDeclaration *sd, const Loc &callerLoc) {
// Make sure to resolve each struct type exactly once.
if (sd->ir->isResolved()) {
return;
}
sd->ir->setResolved();
IF_LOG Logger::println("Resolving struct type: %s (%s)", sd->toChars(),
sd->loc.toChars());
LOG_SCOPE;
// make sure type exists
DtoType(sd->type);
// if it's a forward declaration, all bets are off. The type should be enough
if (sd->sizeok != Sizeok::done) {
error(callerLoc, "struct `%s.%s` unknown size", sd->getModule()->toChars(),
sd->toChars());
fatal();
}
// create the IrAggr
getIrAggr(sd, true);
// Set up our field metadata.
for (auto vd : sd->fields) {
IF_LOG {
if (isIrFieldCreated(vd)) {
Logger::println("struct field already exists");
}
}
getIrField(vd, true);
}
}
////////////////////////////////////////////////////////////////////////////////
//////////////////////////// D STRUCT UTILITIES
///////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
LLValue *DtoStructEquals(EXP op, DValue *lhs, DValue *rhs) {
Type *t = lhs->type->toBasetype();
assert(t->ty == TY::Tstruct);
// set predicate
llvm::ICmpInst::Predicate cmpop;
if (op == EXP::equal || op == EXP::identity) {
cmpop = llvm::ICmpInst::ICMP_EQ;
} else {
cmpop = llvm::ICmpInst::ICMP_NE;
}
// empty struct? EQ always true, NE always false
if (static_cast<TypeStruct *>(t)->sym->fields.length == 0) {
return DtoConstBool(cmpop == llvm::ICmpInst::ICMP_EQ);
}
// call memcmp
size_t sz = getTypeAllocSize(DtoType(t));
LLValue *val = DtoMemCmp(DtoLVal(lhs), DtoLVal(rhs), DtoConstSize_t(sz));
return gIR->ir->CreateICmp(cmpop, val,
LLConstantInt::get(val->getType(), 0, false));
}
////////////////////////////////////////////////////////////////////////////////
/// Return the type returned by DtoUnpaddedStruct called on a value of the
/// specified type.
/// Union types will get expanded into a struct, with a type for each member.
LLType *DtoUnpaddedStructType(Type *dty) {
assert(dty->ty == TY::Tstruct);
typedef llvm::DenseMap<Type *, llvm::StructType *> CacheT;
static llvm::ManagedStatic<CacheT> cache;
auto it = cache->find(dty);
if (it != cache->end()) {
return it->second;
}
TypeStruct *sty = static_cast<TypeStruct *>(dty);
VarDeclarations &fields = sty->sym->fields;
std::vector<LLType *> types;
types.reserve(fields.length);
for (unsigned i = 0; i < fields.length; i++) {
LLType *fty;
if (fields[i]->type->ty == TY::Tstruct) {
// Nested structs are the only members that can contain padding
fty = DtoUnpaddedStructType(fields[i]->type);
} else {
fty = DtoType(fields[i]->type);
}
types.push_back(fty);
}
LLStructType *Ty = LLStructType::get(gIR->context(), types);
cache->insert(std::make_pair(dty, Ty));
return Ty;
}
/// Return the struct value represented by v without the padding fields.
/// Unions will be expanded, with a value for each member.
/// Note: v must be a pointer to a struct, but the return value will be a
/// first-class struct value.
LLValue *DtoUnpaddedStruct(Type *dty, LLValue *v) {
assert(dty->ty == TY::Tstruct);
TypeStruct *sty = static_cast<TypeStruct *>(dty);
VarDeclarations &fields = sty->sym->fields;
LLValue *newval = llvm::UndefValue::get(DtoUnpaddedStructType(dty));
for (unsigned i = 0; i < fields.length; i++) {
LLValue *fieldptr = DtoIndexAggregate(v, sty->sym, fields[i]);
LLValue *fieldval;
if (fields[i]->type->ty == TY::Tstruct) {
// Nested structs are the only members that can contain padding
fieldval = DtoUnpaddedStruct(fields[i]->type, fieldptr);
} else {
fieldval = DtoLoad(fieldptr);
}
newval = DtoInsertValue(newval, fieldval, i);
}
return newval;
}
/// Undo the transformation performed by DtoUnpaddedStruct, writing to lval.
void DtoPaddedStruct(Type *dty, LLValue *v, LLValue *lval) {
assert(dty->ty == TY::Tstruct);
TypeStruct *sty = static_cast<TypeStruct *>(dty);
VarDeclarations &fields = sty->sym->fields;
for (unsigned i = 0; i < fields.length; i++) {
LLValue *fieldptr = DtoIndexAggregate(lval, sty->sym, fields[i]);
LLValue *fieldval = DtoExtractValue(v, i);
if (fields[i]->type->ty == TY::Tstruct) {
// Nested structs are the only members that can contain padding
DtoPaddedStruct(fields[i]->type, fieldval, fieldptr);
} else {
DtoStoreZextI8(fieldval, fieldptr);
}
}
}
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