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#pragma once
#include "Expr.h"
#include "Block.h"
#include "Compiler/Function.h"
namespace storm {
namespace bs {
STORM_PKG(lang.bs);
/**
* Create a function pointer.
*/
class FnPtr : public Expr {
STORM_CLASS;
public:
// Create.
STORM_CTOR FnPtr(Block *block, SrcName *name, Array<SrcName *> *formal);
STORM_CTOR FnPtr(Block *block, Expr *dot, syntax::SStr *name, Array<SrcName *> *formal);
// Create, deduce the parameters from context if possible.
STORM_CTOR FnPtr(Block *block, SrcName *name);
STORM_CTOR FnPtr(Block *block, Expr *dot, syntax::SStr *name);
// Create, assuming we already know the exact function we want to get a pointer for.
STORM_CTOR FnPtr(Function *target, SrcPos pos);
STORM_CTOR FnPtr(Expr *dot, Function *target, SrcPos pos);
// Result.
virtual ExprResult STORM_FN result();
// Code.
virtual void STORM_FN code(CodeGen *state, CodeResult *r);
// Cast penalty. Used to deduce parameter types for the function if none were provided.
virtual Int STORM_FN castPenalty(Value to);
// Output.
virtual void STORM_FN toS(StrBuf *to) const;
private:
// Anything before the dot?
MAYBE(Expr *) dotExpr;
// Type of function pointer to return.
Value ptrType;
// Found function or ctor.
MAYBE(Function *) target;
// If 'ptrType' is 'void' and 'target' is 'null', then these two members are valid, and
// we shall use them to deduce the parameters of the function later.
MAYBE(Block *) parent;
MAYBE(SimpleName *) name;
// Initialize 'target' and 'type'.
void findTarget(const Scope &scope, SrcName *name, Array<SrcName *> *formal, MAYBE(Expr *) dot);
// Find an acceptable function for the result type 't'. Returns 'null' if none is
// found. May modify "t" to account for wrapped maybes, etc.
MAYBE(Function *) acceptableFn(Value &t);
// Generate code.
void code(CodeGen *state, CodeResult *r, Value type, Function *target);
};
}
}
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