mirror of
https://github.com/ldc-developers/ldc.git
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587 lines
17 KiB
C++
587 lines
17 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 "nspace.h"
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#include "rmem.h"
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#include "template.h"
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#include "gen/classes.h"
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#include "gen/functions.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/tollvm.h"
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#include "gen/typinf.h"
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#include "gen/uda.h"
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#include "ir/irtype.h"
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#include "ir/irvar.h"
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#include "llvm/ADT/SmallString.h"
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//////////////////////////////////////////////////////////////////////////////
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namespace {
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// from dmd/src/typinf.c
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bool isSpeculativeType(Type *t) {
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class SpeculativeTypeVisitor : public Visitor {
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public:
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bool result;
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SpeculativeTypeVisitor() : result(false) {}
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using Visitor::visit;
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void visit(Type *t) override {
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Type *tb = t->toBasetype();
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if (tb != t) {
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tb->accept(this);
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}
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}
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void visit(TypeNext *t) override {
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if (t->next) {
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t->next->accept(this);
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}
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}
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void visit(TypeBasic *t) override {}
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void visit(TypeVector *t) override { t->basetype->accept(this); }
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void visit(TypeAArray *t) override {
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t->index->accept(this);
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visit((TypeNext *)t);
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}
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void visit(TypeFunction *t) override {
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visit((TypeNext *)t);
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// Currently TypeInfo_Function doesn't store parameter types.
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}
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void visit(TypeStruct *t) override {
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StructDeclaration *sd = t->sym;
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if (TemplateInstance *ti = sd->isInstantiated()) {
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if (!ti->needsCodegen()) {
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if (ti->minst || sd->requestTypeInfo) {
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return;
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}
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/* Bugzilla 14425: TypeInfo_Struct would refer the members of
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* struct (e.g. opEquals via xopEquals field), so if it's instantiated
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* in speculative context, TypeInfo creation should also be
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* stopped to avoid 'unresolved symbol' linker errors.
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*/
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/* When -debug/-unittest is specified, all of non-root instances are
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* automatically changed to speculative, and here is always reached
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* from those instantiated non-root structs.
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* Therefore, if the TypeInfo is not auctually requested,
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* we have to elide its codegen.
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*/
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result |= true;
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return;
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}
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} else {
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// assert(!sd->inNonRoot() || sd->requestTypeInfo); // valid?
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}
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}
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void visit(TypeClass *t) override {}
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void visit(TypeTuple *t) override {
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if (t->arguments) {
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for (size_t i = 0; i < t->arguments->dim; i++) {
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Type *tprm = (*t->arguments)[i]->type;
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if (tprm) {
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tprm->accept(this);
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}
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if (result) {
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return;
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}
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}
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}
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}
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};
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SpeculativeTypeVisitor v;
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t->accept(&v);
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return v.result;
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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class CodegenVisitor : public Visitor {
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IRState *irs;
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public:
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explicit CodegenVisitor(IRState *irs) : irs(irs) {}
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//////////////////////////////////////////////////////////////////////////
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// Import all functions from class Visitor
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using Visitor::visit;
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//////////////////////////////////////////////////////////////////////////
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void visit(Dsymbol *sym) LLVM_OVERRIDE {
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IF_LOG Logger::println("Ignoring Dsymbol::codegen for %s",
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sym->toPrettyChars());
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}
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//////////////////////////////////////////////////////////////////////////
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void visit(Nspace *ns) LLVM_OVERRIDE {
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IF_LOG Logger::println("Nspace::codegen for %s", ns->toPrettyChars());
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LOG_SCOPE
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if (!isError(ns) && ns->members) {
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for (auto sym : *ns->members)
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sym->accept(this);
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}
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}
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//////////////////////////////////////////////////////////////////////////
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void visit(InterfaceDeclaration *decl) LLVM_OVERRIDE {
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IF_LOG Logger::println("InterfaceDeclaration::codegen: '%s'",
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decl->toPrettyChars());
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LOG_SCOPE
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if (decl->ir->isDefined()) {
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return;
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}
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if (decl->type->ty == Terror) {
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error(decl->loc, "had semantic errors when compiling");
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decl->ir->setDefined();
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return;
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}
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if (decl->members && decl->symtab) {
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DtoResolveClass(decl);
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decl->ir->setDefined();
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// Emit any members (e.g. final functions).
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for (auto m : *decl->members) {
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m->accept(this);
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}
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// Emit TypeInfo.
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DtoTypeInfoOf(decl->type);
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// Define __InterfaceZ.
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IrAggr *ir = getIrAggr(decl);
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llvm::GlobalVariable *interfaceZ = ir->getClassInfoSymbol();
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interfaceZ->setInitializer(ir->getClassInfoInit());
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setLinkage(decl, interfaceZ);
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}
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}
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//////////////////////////////////////////////////////////////////////////
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void visit(StructDeclaration *decl) LLVM_OVERRIDE {
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IF_LOG Logger::println("StructDeclaration::codegen: '%s'",
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decl->toPrettyChars());
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LOG_SCOPE
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if (decl->ir->isDefined()) {
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return;
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}
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if (decl->type->ty == Terror) {
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error(decl->loc, "had semantic errors when compiling");
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decl->ir->setDefined();
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return;
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}
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if (!(decl->members && decl->symtab)) {
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return;
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}
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DtoResolveStruct(decl);
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decl->ir->setDefined();
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for (auto m : *decl->members) {
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m->accept(this);
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}
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// Define the __initZ symbol.
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IrAggr *ir = getIrAggr(decl);
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llvm::GlobalVariable *initZ = ir->getInitSymbol();
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initZ->setInitializer(ir->getDefaultInit());
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setLinkage(decl, initZ);
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// emit typeinfo
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DtoTypeInfoOf(decl->type);
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// Emit __xopEquals/__xopCmp/__xtoHash.
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if (decl->xeq && decl->xeq != decl->xerreq) {
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decl->xeq->accept(this);
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}
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if (decl->xcmp && decl->xcmp != decl->xerrcmp) {
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decl->xcmp->accept(this);
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}
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if (decl->xhash) {
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decl->xhash->accept(this);
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}
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}
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//////////////////////////////////////////////////////////////////////////
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void visit(ClassDeclaration *decl) LLVM_OVERRIDE {
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IF_LOG Logger::println("ClassDeclaration::codegen: '%s'",
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decl->toPrettyChars());
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LOG_SCOPE
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if (decl->ir->isDefined()) {
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return;
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}
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if (decl->type->ty == Terror) {
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error(decl->loc, "had semantic errors when compiling");
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decl->ir->setDefined();
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return;
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}
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if (decl->members && decl->symtab) {
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DtoResolveClass(decl);
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decl->ir->setDefined();
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for (auto m : *decl->members) {
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m->accept(this);
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}
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IrAggr *ir = getIrAggr(decl);
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const auto lwc = DtoLinkage(decl);
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llvm::GlobalVariable *initZ = ir->getInitSymbol();
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initZ->setInitializer(ir->getDefaultInit());
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setLinkage(lwc, initZ);
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llvm::GlobalVariable *vtbl = ir->getVtblSymbol();
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vtbl->setInitializer(ir->getVtblInit());
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setLinkage(lwc, vtbl);
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llvm::GlobalVariable *classZ = ir->getClassInfoSymbol();
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classZ->setInitializer(ir->getClassInfoInit());
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setLinkage(lwc, classZ);
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// No need to do TypeInfo here, it is <name>__classZ for classes in D2.
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}
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}
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//////////////////////////////////////////////////////////////////////////
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void visit(TupleDeclaration *decl) LLVM_OVERRIDE {
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IF_LOG Logger::println("TupleDeclaration::codegen(): '%s'",
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decl->toPrettyChars());
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LOG_SCOPE
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if (decl->ir->isDefined()) {
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return;
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}
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decl->ir->setDefined();
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assert(decl->isexp);
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assert(decl->objects);
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for (auto o : *decl->objects) {
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DsymbolExp *exp = static_cast<DsymbolExp *>(o);
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assert(exp->op == TOKdsymbol);
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exp->s->accept(this);
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}
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}
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//////////////////////////////////////////////////////////////////////////
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void visit(VarDeclaration *decl) LLVM_OVERRIDE {
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IF_LOG Logger::println("VarDeclaration::codegen(): '%s'",
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decl->toPrettyChars());
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LOG_SCOPE;
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if (decl->ir->isDefined()) {
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return;
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}
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if (decl->type->ty == Terror) {
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error(decl->loc, "had semantic errors when compiling");
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decl->ir->setDefined();
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return;
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}
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DtoResolveVariable(decl);
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decl->ir->setDefined();
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// just forward aliases
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if (decl->aliassym) {
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Logger::println("alias sym");
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decl->toAlias()->accept(this);
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return;
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}
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// global variable
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if (decl->isDataseg()) {
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Logger::println("data segment");
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assert(!(decl->storage_class & STCmanifest) &&
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"manifest constant being codegen'd!");
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IrGlobal *irGlobal = getIrGlobal(decl);
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LLGlobalVariable *gvar = llvm::cast<LLGlobalVariable>(irGlobal->value);
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assert(gvar && "DtoResolveVariable should have created value");
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const auto lwc = DtoLinkage(decl);
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if (global.params.vtls && gvar->isThreadLocal() &&
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!(decl->storage_class & STCtemp)) {
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const char *p = decl->loc.toChars();
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fprintf(global.stdmsg, "%s: %s is thread local\n", p, decl->toChars());
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}
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// Check if we are defining or just declaring the global in this module.
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// If we reach here during codegen of an available_externally function,
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// new variable declarations should stay external and therefore must not
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// have an initializer.
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if (!(decl->storage_class & STCextern) && !decl->inNonRoot()) {
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// Build the initializer. Might use this->ir.irGlobal->value!
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LLConstant *initVal =
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DtoConstInitializer(decl->loc, decl->type, decl->_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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llvm::GlobalVariable *newGvar = getOrCreateGlobal(
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decl->loc, irs->module, initVal->getType(), gvar->isConstant(),
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lwc.first, nullptr,
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"", // We take on the name of the old global below.
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gvar->isThreadLocal());
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setLinkage(lwc, newGvar);
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newGvar->setAlignment(gvar->getAlignment());
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applyVarDeclUDAs(decl, newGvar);
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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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irGlobal->value = newGvar;
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}
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// Now, set the initializer.
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assert(!irGlobal->constInit);
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irGlobal->constInit = initVal;
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gvar->setInitializer(initVal);
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setLinkage(lwc, gvar);
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// Also set up the debug info.
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irs->DBuilder.EmitGlobalVariable(gvar, decl);
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}
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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 (irGlobal->nakedUse) {
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irs->usedArray.push_back(DtoBitCast(gvar, getVoidPtrType()));
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}
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IF_LOG Logger::cout() << *gvar << '\n';
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}
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}
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//////////////////////////////////////////////////////////////////////////
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void visit(EnumDeclaration *decl) LLVM_OVERRIDE {
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IF_LOG Logger::println("Ignoring EnumDeclaration::codegen: '%s'",
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decl->toPrettyChars());
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if (decl->type->ty == Terror) {
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error(decl->loc, "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 visit(FuncDeclaration *decl) LLVM_OVERRIDE {
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// don't touch function aliases, they don't contribute any new symbols
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if (!decl->isFuncAliasDeclaration()) {
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DtoDefineFunction(decl);
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}
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}
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//////////////////////////////////////////////////////////////////////////
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void visit(TemplateInstance *decl) LLVM_OVERRIDE {
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IF_LOG Logger::println("TemplateInstance::codegen: '%s'",
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decl->toPrettyChars());
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LOG_SCOPE
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if (decl->ir->isDefined()) {
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Logger::println("Already defined, skipping.");
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return;
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}
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decl->ir->setDefined();
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if (isError(decl)) {
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Logger::println("Has errors, skipping.");
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return;
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}
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if (!decl->members) {
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Logger::println("Has no members, skipping.");
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return;
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}
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// Force codegen if this is a templated function with pragma(inline, true).
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if ((decl->members->dim == 1) &&
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((*decl->members)[0]->isFuncDeclaration()) &&
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((*decl->members)[0]->isFuncDeclaration()->inlining == PINLINEalways)) {
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Logger::println("needsCodegen() == false, but function is marked with "
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"pragma(inline, true), so it really does need "
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"codegen.");
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} else {
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// FIXME: This is #673 all over again.
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if (!decl->needsCodegen()) {
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Logger::println("Does not need codegen, skipping.");
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return;
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}
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}
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for (auto &m : *decl->members) {
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m->accept(this);
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}
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}
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//////////////////////////////////////////////////////////////////////////
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void visit(TemplateMixin *decl) LLVM_OVERRIDE {
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IF_LOG Logger::println("TemplateInstance::codegen: '%s'",
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decl->toPrettyChars());
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LOG_SCOPE
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if (decl->ir->isDefined()) {
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return;
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}
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decl->ir->setDefined();
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if (!isError(decl) && decl->members) {
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for (auto m : *decl->members) {
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m->accept(this);
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}
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}
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}
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//////////////////////////////////////////////////////////////////////////
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void visit(AttribDeclaration *decl) LLVM_OVERRIDE {
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Dsymbols *d = decl->include(nullptr, nullptr);
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if (d) {
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for (auto s : *d) {
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s->accept(this);
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}
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}
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}
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//////////////////////////////////////////////////////////////////////////
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void visit(PragmaDeclaration *decl) LLVM_OVERRIDE {
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if (decl->ident == Id::lib) {
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assert(decl->args && decl->args->dim == 1);
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Expression *e = static_cast<Expression *>(decl->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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auto name = se->toStringz();
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auto nameLen = strlen(name);
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if (global.params.targetTriple->isWindowsGNUEnvironment()) {
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if (nameLen > 4 && !memcmp(name + nameLen - 4, ".lib", 4)) {
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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(name, "shell32", 7)) {
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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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// With LLVM 3.3 or later we can place the library name in the object
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// file. This seems to be supported only on Windows.
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if (global.params.targetTriple->isWindowsMSVCEnvironment()) {
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llvm::SmallString<24> LibName(llvm::StringRef(name, nameLen));
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// Win32: /DEFAULTLIB:"curl"
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if (LibName.endswith(".a")) {
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LibName = LibName.substr(0, LibName.size() - 2);
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}
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if (LibName.endswith(".lib")) {
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LibName = LibName.substr(0, LibName.size() - 4);
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}
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llvm::SmallString<24> tmp("/DEFAULTLIB:\"");
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tmp.append(LibName);
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tmp.append("\"");
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LibName = tmp;
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// Embedd library name as linker option in object file
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#if LDC_LLVM_VER >= 306
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llvm::Metadata *Value = llvm::MDString::get(gIR->context(), LibName);
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gIR->LinkerMetadataArgs.push_back(
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llvm::MDNode::get(gIR->context(), Value));
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#else
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llvm::Value *Value = llvm::MDString::get(gIR->context(), LibName);
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gIR->LinkerMetadataArgs.push_back(
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llvm::MDNode::get(gIR->context(), Value));
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#endif
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} else {
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size_t const n = nameLen + 3;
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char *arg = static_cast<char *>(mem.xmalloc(n));
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arg[0] = '-';
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arg[1] = 'l';
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memcpy(arg + 2, name, 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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}
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visit(static_cast<AttribDeclaration *>(decl));
|
||
}
|
||
|
||
//////////////////////////////////////////////////////////////////////////
|
||
|
||
void visit(TypeInfoDeclaration *decl) LLVM_OVERRIDE {
|
||
if (isSpeculativeType(decl->tinfo)) {
|
||
return;
|
||
}
|
||
TypeInfoDeclaration_codegen(decl, irs);
|
||
}
|
||
|
||
//////////////////////////////////////////////////////////////////////////
|
||
|
||
void visit(TypeInfoClassDeclaration *decl) LLVM_OVERRIDE {
|
||
if (isSpeculativeType(decl->tinfo)) {
|
||
return;
|
||
}
|
||
TypeInfoClassDeclaration_codegen(decl, irs);
|
||
}
|
||
};
|
||
|
||
//////////////////////////////////////////////////////////////////////////////
|
||
|
||
void Declaration_codegen(Dsymbol *decl) {
|
||
CodegenVisitor v(gIR);
|
||
decl->accept(&v);
|
||
}
|
||
|
||
void Declaration_codegen(Dsymbol *decl, IRState *irs) {
|
||
CodegenVisitor v(irs);
|
||
decl->accept(&v);
|
||
}
|
||
|
||
//////////////////////////////////////////////////////////////////////////////
|