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2cebe6408c
This is just to improve clarity, as it was rather non-obvious what of the code also applied to classes before. IrTypeAggr::createInitializerConstant would currently belong in IrTypeStruct, but this will be refactored anyway.
364 lines
10 KiB
C++
364 lines
10 KiB
C++
//===-- declarations.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 "aggregate.h"
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#include "declaration.h"
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#include "enum.h"
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#include "id.h"
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#include "init.h"
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#include "rmem.h"
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#include "template.h"
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#include "gen/irstate.h"
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#include "gen/llvm.h"
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#include "gen/llvmhelpers.h"
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#include "gen/logger.h"
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#include "gen/todebug.h"
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#include "gen/tollvm.h"
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#include "ir/ir.h"
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#include "ir/irtype.h"
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#include "ir/irvar.h"
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/* ================================================================== */
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void Dsymbol::codegen(Ir*)
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{
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Logger::println("Ignoring Dsymbol::codegen for %s", toChars());
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}
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/* ================================================================== */
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void Declaration::codegen(Ir*)
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{
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Logger::println("Ignoring Declaration::codegen for %s", toChars());
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}
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/* ================================================================== */
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void InterfaceDeclaration::codegen(Ir*)
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{
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if (type->ty == Terror)
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{ error("had semantic errors when compiling");
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return;
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}
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if (members && symtab)
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DtoResolveDsymbol(this);
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}
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/* ================================================================== */
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void StructDeclaration::codegen(Ir*)
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{
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if (type->ty == Terror)
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{ error("had semantic errors when compiling");
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return;
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}
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if (members && symtab)
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DtoResolveDsymbol(this);
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}
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/* ================================================================== */
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void ClassDeclaration::codegen(Ir*)
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{
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if (type->ty == Terror)
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{ error("had semantic errors when compiling");
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return;
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}
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if (members && symtab)
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DtoResolveDsymbol(this);
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}
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/* ================================================================== */
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void TupleDeclaration::codegen(Ir* p)
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{
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Logger::println("TupleDeclaration::codegen(): %s", toChars());
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assert(isexp);
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assert(objects);
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int n = objects->dim;
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for (int i=0; i < n; ++i)
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{
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DsymbolExp* exp = static_cast<DsymbolExp*>(objects->data[i]);
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assert(exp->op == TOKdsymbol);
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exp->s->codegen(p);
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}
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}
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/* ================================================================== */
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static llvm::GlobalVariable* createGlobal(llvm::Type* type, bool isConst,
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llvm::GlobalValue::LinkageTypes linkage, llvm::StringRef name,
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bool isThreadLocal)
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{
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#if LDC_LLVM_VER >= 302
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// FIXME: clang uses a command line option for the thread model
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const llvm::GlobalVariable::ThreadLocalMode tlsModel =
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isThreadLocal ? llvm::GlobalVariable::GeneralDynamicTLSModel
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: llvm::GlobalVariable::NotThreadLocal;
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return new llvm::GlobalVariable(*gIR->module, type, isConst, linkage,
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NULL, name, 0, tlsModel);
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#else
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return new llvm::GlobalVariable(*gIR->module, type, isConst, linkage,
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NULL, name, 0, isThreadLocal);
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#endif
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}
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void VarDeclaration::codegen(Ir* p)
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{
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Logger::print("VarDeclaration::codegen(): %s | %s\n", toChars(), type->toChars());
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LOG_SCOPE;
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if (type->ty == Terror)
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{ error("had semantic errors when compiling");
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return;
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}
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// just forward aliases
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if (aliassym)
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{
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Logger::println("alias sym");
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toAlias()->codegen(p);
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return;
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}
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// output the parent aggregate first
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if (AggregateDeclaration* ad = isMember())
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ad->codegen(p);
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// global variable
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if (isDataseg() || (storage_class & (STCconst | STCimmutable) && init))
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{
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Logger::println("data segment");
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#if 0 // TODO:
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assert(!(storage_class & STCmanifest) &&
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"manifest constant being codegen'd!");
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#endif
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// don't duplicate work
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if (this->ir.resolved) return;
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this->ir.resolved = true;
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this->ir.declared = true;
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this->ir.irGlobal = new IrGlobal(this);
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Logger::println("parent: %s (%s)", parent->toChars(), parent->kind());
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const bool isLLConst = isConst() && init;
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const llvm::GlobalValue::LinkageTypes llLinkage = DtoLinkage(this);
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assert(!ir.initialized);
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ir.initialized = gIR->dmodule;
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std::string llName(mangle());
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// Since the type of a global must exactly match the type of its
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// initializer, we cannot know the type until after we have emitted the
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// latter (e.g. in case of unions, …). However, it is legal for the
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// initializer to refer to the address of the variable. Thus, we first
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// create a global with the generic type (note the assignment to
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// this->ir.irGlobal->value!), and in case we also do an initializer
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// with a different type later, swap it out and replace any existing
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// uses with bitcasts to the previous type.
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llvm::GlobalVariable* gvar = createGlobal(i1ToI8(DtoType(type)), isLLConst,
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llLinkage, llName, isThreadlocal());
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this->ir.irGlobal->value = gvar;
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// Check if we are defining or just declaring the global in this module.
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if (!(storage_class & STCextern) && mustDefineSymbol(this))
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{
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// Build the initializer. Might use this->ir.irGlobal->value!
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LLConstant *initVal = DtoConstInitializer(loc, type, init);
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// In case of type mismatch, swap out the variable.
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if (initVal->getType() != gvar->getType()->getElementType())
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{
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llvm::GlobalVariable* newGvar = createGlobal(
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initVal->getType(), isLLConst, llLinkage,
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"", // We take on the name of the old global below.
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isThreadlocal());
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newGvar->takeName(gvar);
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llvm::Constant* newValue =
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llvm::ConstantExpr::getBitCast(newGvar, gvar->getType());
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gvar->replaceAllUsesWith(newValue);
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gvar->eraseFromParent();
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gvar = newGvar;
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this->ir.irGlobal->value = newGvar;
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}
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// Now, set the initializer.
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assert(!ir.irGlobal->constInit);
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ir.irGlobal->constInit = initVal;
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gvar->setInitializer(initVal);
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// Also set up the edbug info.
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DtoDwarfGlobalVariable(gvar, this);
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}
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// Set the alignment (it is important not to use type->alignsize because
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// VarDeclarations can have an align() attribute independent of the type
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// as well).
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if (alignment != STRUCTALIGN_DEFAULT)
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gvar->setAlignment(alignment);
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// If this global is used from a naked function, we need to create an
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// artificial "use" for it, or it could be removed by the optimizer if
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// the only reference to it is in inline asm.
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if (nakedUse)
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gIR->usedArray.push_back(DtoBitCast(gvar, getVoidPtrType()));
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if (Logger::enabled())
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Logger::cout() << *gvar << '\n';
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}
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}
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/* ================================================================== */
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void TypedefDeclaration::codegen(Ir*)
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{
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Logger::print("TypedefDeclaration::codegen: %s\n", toChars());
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LOG_SCOPE;
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if (type->ty == Terror)
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{ error("had semantic errors when compiling");
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return;
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}
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// generate typeinfo
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DtoTypeInfoOf(type, false);
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}
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/* ================================================================== */
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void EnumDeclaration::codegen(Ir*)
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{
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Logger::println("Ignoring EnumDeclaration::codegen for %s", toChars());
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if (type->ty == Terror)
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{ error("had semantic errors when compiling");
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return;
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}
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}
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/* ================================================================== */
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void FuncDeclaration::codegen(Ir* p)
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{
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// don't touch function aliases, they don't contribute any new symbols
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if (!isFuncAliasDeclaration())
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{
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DtoResolveDsymbol(this);
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}
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}
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/* ================================================================== */
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void TemplateInstance::codegen(Ir* p)
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{
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#if LOG
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printf("TemplateInstance::codegen('%s', this = %p)\n", toChars(), this);
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#endif
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if (ignore)
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return;
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if (!errors && members)
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{
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for (unsigned i = 0; i < members->dim; i++)
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{
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Dsymbol *s = static_cast<Dsymbol *>(members->data[i]);
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s->codegen(p);
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}
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}
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}
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/* ================================================================== */
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void TemplateMixin::codegen(Ir* p)
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{
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if (!errors && members)
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{
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for (unsigned i = 0; i < members->dim; i++)
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{
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Dsymbol *s = static_cast<Dsymbol *>(members->data[i]);
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if (s->isVarDeclaration())
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continue;
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s->codegen(p);
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}
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}
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}
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/* ================================================================== */
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void AttribDeclaration::codegen(Ir* p)
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{
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Array *d = include(NULL, NULL);
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if (d)
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{
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for (unsigned i = 0; i < d->dim; i++)
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{ Dsymbol *s = static_cast<Dsymbol *>(d->data[i]);
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s->codegen(p);
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}
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}
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}
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/* ================================================================== */
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void PragmaDeclaration::codegen(Ir* p)
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{
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if (ident == Id::lib)
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{
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assert(args && args->dim == 1);
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Expression *e = static_cast<Expression *>(args->data[0]);
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assert(e->op == TOKstring);
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StringExp *se = static_cast<StringExp *>(e);
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size_t nameLen = se->len;
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if (global.params.targetTriple.getOS() == llvm::Triple::MinGW32)
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{
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if (nameLen > 4 &&
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!memcmp(static_cast<char*>(se->string) + nameLen - 4, ".lib", 4))
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{
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// On MinGW, strip the .lib suffix, if any, to improve
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// compatibility with code written for DMD (we pass the name to GCC
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// via -l, just as on Posix).
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nameLen -= 4;
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}
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if (nameLen >= 7 && !memcmp(se->string, "shell32", 7))
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{
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// Another DMD compatibility kludge: Ignore
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// pragma(lib, "shell32.lib"), it is implicitly provided by
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// MinGW.
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return;
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}
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}
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size_t const n = nameLen + 3;
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char *arg = static_cast<char *>(mem.malloc(n));
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arg[0] = '-';
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arg[1] = 'l';
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memcpy(arg + 2, se->string, nameLen);
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arg[n-1] = 0;
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global.params.linkswitches->push(arg);
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}
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AttribDeclaration::codegen(p);
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}
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/* ================================================================== */
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