view ir/irvar.h @ 1499:df11cdec45a2

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
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#ifndef LDC_IR_IRVAR_H
#define LDC_IR_IRVAR_H

#include "ir/ir.h"
#include "llvm/Type.h"

struct IrVar : IrBase
{
    IrVar(VarDeclaration* var);

    VarDeclaration* V;
    llvm::Value* value;
};

// represents a global variable
struct IrGlobal : IrVar
{
    IrGlobal(VarDeclaration* v);

    llvm::PATypeHolder type;
    llvm::Constant* constInit;
};

// represents a local variable variable
struct IrLocal : IrVar
{
    IrLocal(VarDeclaration* v);

    bool byref;         // Not used for -nested-ctx=array
    int nestedDepth;    // ditto
    int nestedIndex;
};

// represents an aggregate field variable
struct IrField : IrVar
{
    IrField(VarDeclaration* v);

    unsigned index;
    unsigned unionOffset;

    llvm::Constant* getDefaultInit();

protected:
    /// FIXME: only used for StructLiteralsExps
    llvm::Constant* constInit;
};

#endif