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Another shot at fixing the issues with (constant) struct literals and their addresses. See DMD2682, #218, #324. The idea is to separate the notion of const from 'this variable can always be replaced with its initializer' in the frontend. To do that, I introduced Declaration::isSameAsInitializer, which is overridden in VarDeclaration to return false for constants that have a struct literal initializer. So {{{ const S s = S(5); void foo() { auto ps = &s; } // is no longer replaced by void foo() { auto ps = &(S(5)); } }}} To make taking the address of a struct constant with a struct-initializer outside of function scope possible, I made sure that AddrExp::optimize doesn't try to run the argument's optimization with WANTinterpret - that'd again replace the constant with a struct literal temporary.
author Christian Kamm <kamm incasoftware de>
date Sun, 14 Jun 2009 19:49:58 +0200
parents 0c03ba6f7c24
children 8d086d552909
line wrap: on
line source

#include "gen/llvm.h"
#include "declaration.h"
#include "ir/irvar.h"


//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////

IrVar::IrVar(VarDeclaration* var)
{
    V = var;
    value = NULL;
}

//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////

IrGlobal::IrGlobal(VarDeclaration* v): IrVar(v),
    type(llvm::OpaqueType::get())
{
    constInit = NULL;
}

//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////

IrLocal::IrLocal(VarDeclaration* v) : IrVar(v)
{
    nestedIndex = -1;
}

//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////

IrField::IrField(VarDeclaration* v) : IrVar(v)
{
    assert(V->ir.irField == NULL && "field for this variable already exists");
    V->ir.irField = this;

    if (v->aggrIndex)
    {
        index = v->aggrIndex;
        unionOffset = 0;
    }
    else
    {
        index = 0;
        unionOffset = v->offset;
    }
    constInit = NULL;
}

extern LLConstant* get_default_initializer(
    VarDeclaration* vd,
    Initializer* init);

llvm::Constant * IrField::getDefaultInit()
{
    if (constInit)
        return constInit;
    constInit = get_default_initializer(V, V->init);
    return constInit;
}

//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////