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Distinguish between dereferencing pointers and references.

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We now have separate Expr implementations for dereferencing pointers
and automatically dereferencing references.  This is in particular
necessary so that we can detect attempts to dereference references
with the '*' operator in programs and issue an error in that case.

Fixes issue #192.
This commit is contained in:
Matt Pharr
2012-03-22 06:48:02 -07:00
parent 10c5ba140c
commit 20044f5749
7 changed files with 173 additions and 75 deletions
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40
expr.h
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@@ -1,5 +1,5 @@
/*
Copyright (c) 2010-2011, Intel Corporation
Copyright (c) 2010-2012, Intel Corporation
All rights reserved.
Redistribution and use in source and binary forms, with or without
@@ -530,26 +530,48 @@ public:
};
/** @brief Expression that represents dereferencing a reference to get its
value. */
class DereferenceExpr : public Expr {
/** @brief Common base class that provides shared functionality for
PtrDerefExpr and RefDerefExpr. */
class DerefExpr : public Expr {
public:
DereferenceExpr(Expr *e, SourcePos p);
DerefExpr(Expr *e, SourcePos p);
llvm::Value *GetValue(FunctionEmitContext *ctx) const;
llvm::Value *GetLValue(FunctionEmitContext *ctx) const;
const Type *GetType() const;
const Type *GetLValueType() const;
Symbol *GetBaseSymbol() const;
void Print() const;
Expr *TypeCheck();
Expr *Optimize();
int EstimateCost() const;
Expr *expr;
};
/** @brief Expression that represents dereferencing a pointer to get its
value. */
class PtrDerefExpr : public DerefExpr {
public:
PtrDerefExpr(Expr *e, SourcePos p);
const Type *GetType() const;
void Print() const;
Expr *TypeCheck();
int EstimateCost() const;
};
/** @brief Expression that represents dereferencing a reference to get its
value. */
class RefDerefExpr : public DerefExpr {
public:
RefDerefExpr(Expr *e, SourcePos p);
const Type *GetType() const;
void Print() const;
Expr *TypeCheck();
int EstimateCost() const;
};
/** Expression that represents taking the address of an expression. */
class AddressOfExpr : public Expr {
public: