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