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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 f5729209a1d4
children
line wrap: on
line source

#include "gen/llvm.h"

#include "gen/tollvm.h"
#include "gen/irstate.h"
#include "gen/logger.h"
#include "gen/dvalue.h"
#include "gen/llvmhelpers.h"

#include "declaration.h"

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

DVarValue::DVarValue(Type* t, VarDeclaration* vd, LLValue* llvmValue)
: DValue(t), var(vd), val(llvmValue)
{}

DVarValue::DVarValue(Type* t, LLValue* llvmValue)
: DValue(t), var(0), val(llvmValue)
{}

LLValue* DVarValue::getLVal()
{
    assert(val);
    return val;
}

LLValue* DVarValue::getRVal()
{
    assert(val);
    Type* bt = type->toBasetype();
    if (DtoIsPassedByRef(bt))
        return val;
    return DtoLoad(val);
}

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

LLValue* DSliceValue::getRVal()
{
    assert(len);
    assert(ptr);
    return DtoAggrPair(len, ptr);
}

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

DFuncValue::DFuncValue(FuncDeclaration* fd, LLValue* v, LLValue* vt)
: DValue(fd->type), func(fd), val(v), vthis(vt)
{}

LLValue* DFuncValue::getRVal()
{
    assert(val);
    return val;
}

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

LLValue* DConstValue::getRVal()
{
    assert(c);
    return c;
}

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