ced3f1f5fc
In general, it should just return the original node pointer, but for type checking and optimization passes, it can return a new value for the node (that will be assigned where the old one was in the tree.) Along the way, fixed some bugs in WalkAST() where the postorder callback wouldn't end up being called for a few expr types (sizeof, dereference, address of, reference).
116 lines
4.2 KiB
C++
116 lines
4.2 KiB
C++
/*
|
|
Copyright (c) 2011, Intel Corporation
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
* Neither the name of Intel Corporation nor the names of its
|
|
contributors may be used to endorse or promote products derived from
|
|
this software without specific prior written permission.
|
|
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
|
|
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
|
|
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
|
|
OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/** @file ast.h
|
|
@brief
|
|
*/
|
|
|
|
#ifndef ISPC_AST_H
|
|
#define ISPC_AST_H 1
|
|
|
|
#include "ispc.h"
|
|
#include <vector>
|
|
|
|
/** @brief Abstract base class for nodes in the abstract syntax tree (AST).
|
|
|
|
This class defines a basic interface that all abstract syntax tree
|
|
(AST) nodes must implement. The base classes for both expressions
|
|
(Expr) and statements (Stmt) inherit from this class.
|
|
*/
|
|
class ASTNode {
|
|
public:
|
|
ASTNode(SourcePos p) : pos(p) { }
|
|
virtual ~ASTNode();
|
|
|
|
/** The Optimize() method should perform any appropriate early-stage
|
|
optimizations on the node (e.g. constant folding). The caller
|
|
should use the returned ASTNode * in place of the original node.
|
|
This method may return NULL if an error is encountered during
|
|
optimization. */
|
|
virtual ASTNode *Optimize() = 0;
|
|
|
|
/** Type checking should be performed by the node when this method is
|
|
called. In the event of an error, a NULL value may be returned.
|
|
As with ASTNode::Optimize(), the caller should store the returned
|
|
pointer in place of the original ASTNode *. */
|
|
virtual ASTNode *TypeCheck() = 0;
|
|
|
|
virtual int EstimateCost() const = 0;
|
|
|
|
/** All AST nodes must track the file position where they are
|
|
defined. */
|
|
SourcePos pos;
|
|
};
|
|
|
|
|
|
/** Simple representation of the abstract syntax trees for all of the
|
|
functions declared in a compilation unit.
|
|
*/
|
|
class AST {
|
|
public:
|
|
/** Add the AST for a function described by the given declaration
|
|
information and source code. */
|
|
void AddFunction(Symbol *sym, const std::vector<Symbol *> &args,
|
|
Stmt *code);
|
|
|
|
/** Generate LLVM IR for all of the functions into the current
|
|
module. */
|
|
void GenerateIR();
|
|
|
|
private:
|
|
std::vector<Function *> functions;
|
|
};
|
|
|
|
|
|
/** Callback function type for preorder traversial visiting function for
|
|
the AST walk.
|
|
*/
|
|
typedef bool (* ASTPreCallBackFunc)(ASTNode *node, void *data);
|
|
|
|
/** Callback function type for postorder traversial visiting function for
|
|
the AST walk.
|
|
*/
|
|
typedef ASTNode * (* ASTPostCallBackFunc)(ASTNode *node, void *data);
|
|
|
|
/** Walk (some portion of) an AST, starting from the given root node. At
|
|
each node, if preFunc is non-NULL, call it, passing the given void
|
|
*data pointer; if the call to preFunc function returns false, then the
|
|
children of the node aren't visited. This function then makes
|
|
recursive calls to WalkAST() to process the node's children; after
|
|
doing so, calls postFunc, at the node. The return value from the
|
|
postFunc call is ignored. */
|
|
extern ASTNode *WalkAST(ASTNode *root, ASTPreCallBackFunc preFunc,
|
|
ASTPostCallBackFunc postFunc, void *data);
|
|
|
|
#endif // ISPC_AST_H
|