f9c67ff806
Added AST and Function classes. Now, we parse the whole file and build up the AST for all of the functions in the Module before we emit IR for the functions (vs. before, when we generated IR along the way as we parsed the source file.)
309 lines
9.5 KiB
C++
309 lines
9.5 KiB
C++
/*
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Copyright (c) 2010-2011, Intel Corporation
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Intel Corporation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/** @file stmt.h
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@brief File with declarations for classes related to statements in the language
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*/
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#ifndef ISPC_STMT_H
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#define ISPC_STMT_H 1
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#include "ispc.h"
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#include "ast.h"
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/** @brief Interface class for statements in the ispc language.
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This abstract base-class encapsulates methods that AST nodes for
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statements in the language must implement.
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*/
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class Stmt : public ASTNode {
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public:
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Stmt(SourcePos p) : ASTNode(p) { }
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/** Emit LLVM IR for the statement, using the FunctionEmitContext to create the
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necessary instructions.
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*/
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virtual void EmitCode(FunctionEmitContext *ctx) const = 0;
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/** Print a representation of the statement (and any children AST
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nodes) to standard output. This method is used for debuggins. */
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virtual void Print(int indent) const = 0;
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// Redeclare these methods with Stmt * return values, rather than
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// ASTNode *s, as in the original ASTNode declarations of them.
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virtual Stmt *Optimize() = 0;
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virtual Stmt *TypeCheck() = 0;
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};
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/** @brief Statement representing a single expression */
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class ExprStmt : public Stmt {
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public:
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ExprStmt(Expr *expr, SourcePos pos);
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void EmitCode(FunctionEmitContext *ctx) const;
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void Print(int indent) const;
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Stmt *Optimize();
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Stmt *TypeCheck();
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int EstimateCost() const;
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Expr *expr;
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};
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/** @brief Statement representing a single declaration (which in turn may declare
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a number of variables. */
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class DeclStmt : public Stmt {
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public:
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DeclStmt(SourcePos pos, Declaration *declaration, SymbolTable *symbolTable);
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void EmitCode(FunctionEmitContext *ctx) const;
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void Print(int indent) const;
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Stmt *Optimize();
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Stmt *TypeCheck();
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int EstimateCost() const;
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Declaration *declaration;
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};
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/** @brief Statement representing a single if statement, possibly with an
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else clause. */
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class IfStmt : public Stmt {
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public:
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IfStmt(Expr *testExpr, Stmt *trueStmts, Stmt *falseStmts,
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bool doAllCheck, SourcePos pos);
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void EmitCode(FunctionEmitContext *ctx) const;
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void Print(int indent) const;
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Stmt *Optimize();
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Stmt *TypeCheck();
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int EstimateCost() const;
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// @todo these are only public for lHasVaryingBreakOrContinue(); would
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// be nice to clean that up...
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/** Expression giving the 'if' test. */
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Expr *test;
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/** Statements to run if the 'if' test returns a true value */
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Stmt *trueStmts;
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/** Statements to run if the 'if' test returns a false value */
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Stmt *falseStmts;
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private:
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/** This value records if this was a 'coherent' if statement in the
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source and thus, if the emitted code should check to see if all
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active program instances want to follow just one of the 'true' or
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'false' blocks. */
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const bool doAllCheck;
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const bool doAnyCheck;
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void emitMaskedTrueAndFalse(FunctionEmitContext *ctx, llvm::Value *oldMask,
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llvm::Value *test) const;
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void emitVaryingIf(FunctionEmitContext *ctx, llvm::Value *test) const;
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void emitMaskAllOn(FunctionEmitContext *ctx,
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llvm::Value *test, llvm::BasicBlock *bDone) const;
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void emitMaskMixed(FunctionEmitContext *ctx, llvm::Value *oldMask,
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llvm::Value *test, llvm::BasicBlock *bDone) const;
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};
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/** @brief Statement implementation representing a 'do' statement in the
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program.
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*/
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class DoStmt : public Stmt {
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public:
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DoStmt(Expr *testExpr, Stmt *bodyStmts, bool doCoherentCheck,
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SourcePos pos);
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void EmitCode(FunctionEmitContext *ctx) const;
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void Print(int indent) const;
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Stmt *Optimize();
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Stmt *TypeCheck();
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int EstimateCost() const;
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Expr *testExpr;
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Stmt *bodyStmts;
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const bool doCoherentCheck;
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};
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/** @brief Statement implementation for 'for' loops (as well as for 'while'
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loops).
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*/
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class ForStmt : public Stmt {
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public:
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ForStmt(Stmt *initializer, Expr *testExpr, Stmt *stepStatements,
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Stmt *bodyStatements, bool doCoherentCheck, SourcePos pos);
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void EmitCode(FunctionEmitContext *ctx) const;
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void Print(int indent) const;
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Stmt *Optimize();
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Stmt *TypeCheck();
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int EstimateCost() const;
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/** 'for' statment initializer; may be NULL, indicating no intitializer */
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Stmt *init;
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/** expression that returns a value indicating whether the loop should
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continue for the next iteration */
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Expr *test;
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/** Statements to run at the end of the loop for the loop step, before
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the test expression is evaluated. */
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Stmt *step;
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/** Loop body statements */
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Stmt *stmts;
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const bool doCoherentCheck;
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};
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/** @brief Statement implementation for a break or 'coherent' break
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statement in the program. */
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class BreakStmt : public Stmt {
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public:
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BreakStmt(bool doCoherenceCheck, SourcePos pos);
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void EmitCode(FunctionEmitContext *ctx) const;
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void Print(int indent) const;
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Stmt *Optimize();
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Stmt *TypeCheck();
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int EstimateCost() const;
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private:
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/** This indicates whether the generated code will check to see if no
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more program instances are currently running after the break, in
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which case the code can have a jump to the end of the current
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loop. */
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const bool doCoherenceCheck;
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};
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/** @brief Statement implementation for a continue or 'coherent' continue
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statement in the program. */
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class ContinueStmt : public Stmt {
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public:
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ContinueStmt(bool doCoherenceCheck, SourcePos pos);
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void EmitCode(FunctionEmitContext *ctx) const;
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void Print(int indent) const;
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Stmt *Optimize();
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Stmt *TypeCheck();
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int EstimateCost() const;
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private:
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/** This indicates whether the generated code will check to see if no
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more program instances are currently running after the continue, in
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which case the code can have a jump to the end of the current
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loop. */
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const bool doCoherenceCheck;
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};
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/** @brief Statement implementation for a 'return' or 'coherent' return
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statement in the program. */
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class ReturnStmt : public Stmt {
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public:
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ReturnStmt(Expr *v, bool cc, SourcePos p);
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void EmitCode(FunctionEmitContext *ctx) const;
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void Print(int indent) const;
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Stmt *Optimize();
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Stmt *TypeCheck();
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int EstimateCost() const;
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Expr *val;
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/** This indicates whether the generated code will check to see if no
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more program instances are currently running after the return, in
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which case the code can possibly jump to the end of the current
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function. */
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const bool doCoherenceCheck;
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};
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/** @brief Representation of a list of statements in the program.
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*/
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class StmtList : public Stmt {
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public:
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StmtList(SourcePos p) : Stmt(p) { }
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void EmitCode(FunctionEmitContext *ctx) const;
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void Print(int indent) const;
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Stmt *Optimize();
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Stmt *TypeCheck();
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int EstimateCost() const;
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void Add(Stmt *s) { if (s) stmts.push_back(s); }
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const std::vector<Stmt *> &GetStatements() { return stmts; }
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private:
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std::vector<Stmt *> stmts;
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};
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/** @brief Representation of a print() statement in the program.
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It's currently necessary to have a special statement type for print()
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since strings aren't supported as first-class types in the language,
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but we need to be able to pass a formatting string as the first
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argument to print(). We also need this to be a variable argument
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function, which also isn't supported. Representing print() as a
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statement lets us work around both of those ugly little issues...
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*/
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class PrintStmt : public Stmt {
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public:
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PrintStmt(const std::string &f, Expr *v, SourcePos p);
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void EmitCode(FunctionEmitContext *ctx) const;
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void Print(int indent) const;
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Stmt *Optimize();
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Stmt *TypeCheck();
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int EstimateCost() const;
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/** Format string for the print() statement. */
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const std::string format;
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/** This holds the arguments passed to the print() statement. If more
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than one was provided, this will be an ExprList. */
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Expr *values;
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};
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#endif // ISPC_STMT_H
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