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//===-- rttibuilder.cpp ---------------------------------------------------===//
//
// LDC – the LLVM D compiler
//
// This file is distributed under the BSD-style LDC license. See the LICENSE
// file for details.
//
//===----------------------------------------------------------------------===//
#include "gen/rttibuilder.h"
#include "dmd/aggregate.h"
#include "dmd/mangle.h"
#include "dmd/mtype.h"
#include "gen/arrays.h"
#include "gen/functions.h"
#include "gen/irstate.h"
#include "gen/linkage.h"
#include "gen/llvm.h"
#include "gen/llvmhelpers.h"
#include "gen/tollvm.h"
#include "ir/iraggr.h"
#include "ir/irfunction.h"
// in dmd/opover.d:
AggregateDeclaration *isAggregate(Type *t);
RTTIBuilder::RTTIBuilder(Type *baseType) {
const auto ad = isAggregate(baseType);
assert(ad && "not an aggregate type");
DtoResolveDsymbol(ad);
if (auto cd = ad->isClassDeclaration()) {
const auto baseir = getIrAggr(cd);
assert(baseir && "no IrAggr for TypeInfo base class");
// just start with adding the vtbl
push(baseir->getVtblSymbol());
// and monitor
push_null_vp();
}
}
void RTTIBuilder::push(llvm::Constant *C) {
// We need to explicitly zero any padding bytes as per TDPL §7.1.1 (and
// also match the struct type lowering code here).
const uint64_t fieldStart = llvm::alignTo(
prevFieldEnd, gDataLayout->getABITypeAlignment(C->getType()));
const uint64_t paddingBytes = fieldStart - prevFieldEnd;
if (paddingBytes) {
llvm::Type *const padding = llvm::ArrayType::get(
llvm::Type::getInt8Ty(gIR->context()), paddingBytes);
inits.push_back(llvm::Constant::getNullValue(padding));
}
inits.push_back(C);
prevFieldEnd = fieldStart + gDataLayout->getTypeAllocSize(C->getType());
}
void RTTIBuilder::push_null(Type *T) { push(getNullValue(DtoType(T))); }
void RTTIBuilder::push_null_vp() { push(getNullValue(getVoidPtrType())); }
void RTTIBuilder::push_typeinfo(Type *t) { push(DtoTypeInfoOf(Loc(), t)); }
void RTTIBuilder::push_string(const char *str) { push(DtoConstString(str)); }
void RTTIBuilder::push_null_void_array() {
LLType *T = DtoType(Type::tvoid->arrayOf());
push(getNullValue(T));
}
void RTTIBuilder::push_void_array(uint64_t dim, llvm::Constant *ptr) {
push(DtoConstSlice(DtoConstSize_t(dim), DtoBitCast(ptr, getVoidPtrType())));
}
void RTTIBuilder::push_void_array(llvm::Constant *CI, Type *valtype,
Dsymbol *mangle_sym) {
OutBuffer initname;
mangleToBuffer(mangle_sym, &initname);
initname.writestring(".rtti.voidarr.data");
const LinkageWithCOMDAT lwc(TYPEINFO_LINKAGE_TYPE, needsCOMDAT());
auto G = new LLGlobalVariable(gIR->module, CI->getType(), true, lwc.first, CI,
initname.peekChars());
setLinkage(lwc, G);
G->setAlignment(LLMaybeAlign(DtoAlignment(valtype)));
push_void_array(getTypeAllocSize(CI->getType()), G);
}
void RTTIBuilder::push_array(llvm::Constant *CI, uint64_t dim, Type *valtype,
Dsymbol *mangle_sym) {
std::string tmpStr(valtype->arrayOf()->toChars());
tmpStr.erase(remove(tmpStr.begin(), tmpStr.end(), '['), tmpStr.end());
tmpStr.erase(remove(tmpStr.begin(), tmpStr.end(), ']'), tmpStr.end());
tmpStr.append("arr");
OutBuffer initname;
if (mangle_sym)
mangleToBuffer(mangle_sym, &initname);
else
initname.writestring(".ldc");
initname.writestring(".rtti.");
initname.writestring(tmpStr.c_str());
initname.writestring(".data");
const LinkageWithCOMDAT lwc(TYPEINFO_LINKAGE_TYPE, needsCOMDAT());
auto G = new LLGlobalVariable(gIR->module, CI->getType(), true, lwc.first, CI,
initname.peekChars());
setLinkage(lwc, G);
G->setAlignment(LLMaybeAlign(DtoAlignment(valtype)));
push_array(dim, DtoBitCast(G, DtoType(valtype->pointerTo())));
}
void RTTIBuilder::push_array(uint64_t dim, llvm::Constant *ptr) {
push(DtoConstSlice(DtoConstSize_t(dim), ptr));
}
void RTTIBuilder::push_uint(unsigned u) { push(DtoConstUint(u)); }
void RTTIBuilder::push_size(uint64_t s) { push(DtoConstSize_t(s)); }
void RTTIBuilder::push_size_as_vp(uint64_t s) {
push(llvm::ConstantExpr::getIntToPtr(DtoConstSize_t(s), getVoidPtrType()));
}
void RTTIBuilder::push_funcptr(FuncDeclaration *fd, Type *castto) {
if (fd) {
LLConstant *F = DtoCallee(fd);
if (castto) {
F = DtoBitCast(F, DtoType(castto));
}
push(F);
} else if (castto) {
push_null(castto);
} else {
push_null_vp();
}
}
void RTTIBuilder::finalize(LLGlobalVariable *gvar) {
LLStructType *st = isaStruct(gvar->getValueType());
assert(st);
// finalize the type if opaque (e.g., for ModuleInfos)
if (st->isOpaque()) {
std::vector<LLType *> fieldTypes;
fieldTypes.reserve(inits.size());
for (auto c : inits) {
fieldTypes.push_back(c->getType());
}
st->setBody(fieldTypes);
}
// create the initializer
LLConstant *tiInit = get_constant(st);
// set the initializer
gvar->setInitializer(tiInit);
}
LLConstant *RTTIBuilder::get_constant(LLStructType *initType) {
assert(initType->getNumElements() == inits.size());
std::vector<LLConstant *> castInits;
castInits.reserve(inits.size());
for (unsigned i = 0; i < inits.size(); ++i) {
castInits.push_back(DtoBitCast(inits[i], initType->getElementType(i)));
}
return LLConstantStruct::get(initType, castInits);
}
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