| Chris Lattner | c0b42e9 | 2007-10-23 06:27:55 +0000 | [diff] [blame^] | 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" |
| 2 | "http://www.w3.org/TR/html4/strict.dtd"> |
| 3 | |
| 4 | <html> |
| 5 | <head> |
| 6 | <title>Kaleidoscope: Adding JIT and Optimizer Support</title> |
| 7 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> |
| 8 | <meta name="author" content="Chris Lattner"> |
| 9 | <link rel="stylesheet" href="../llvm.css" type="text/css"> |
| 10 | </head> |
| 11 | |
| 12 | <body> |
| 13 | |
| 14 | <div class="doc_title">Kaleidoscope: Adding JIT and Optimizer Support</div> |
| 15 | |
| 16 | <div class="doc_author"> |
| 17 | <p>Written by <a href="mailto:sabre@nondot.org">Chris Lattner</a></p> |
| 18 | </div> |
| 19 | |
| 20 | <!-- *********************************************************************** --> |
| 21 | <div class="doc_section"><a name="intro">Part 4 Introduction</a></div> |
| 22 | <!-- *********************************************************************** --> |
| 23 | |
| 24 | <div class="doc_text"> |
| 25 | |
| 26 | <p>Welcome to part 4 of the "<a href="index.html">Implementing a language with |
| 27 | LLVM</a>" tutorial.</p> |
| 28 | |
| 29 | </div> |
| 30 | |
| 31 | <!-- *********************************************************************** --> |
| 32 | <div class="doc_section"><a name="basics">Code Generation setup</a></div> |
| 33 | <!-- *********************************************************************** --> |
| 34 | |
| 35 | <div class="doc_text"> |
| 36 | |
| 37 | <p> |
| 38 | In order to generate LLVM IR, we want some simple setup to get started. First, |
| 39 | we define virtual codegen methods in each AST class:</p> |
| 40 | |
| 41 | <div class="doc_code"> |
| 42 | <pre> |
| 43 | /// ExprAST - Base class for all expression nodes. |
| 44 | class ExprAST { |
| 45 | public: |
| 46 | virtual ~ExprAST() {} |
| 47 | virtual Value *Codegen() = 0; |
| 48 | }; |
| 49 | |
| 50 | /// NumberExprAST - Expression class for numeric literals like "1.0". |
| 51 | class NumberExprAST : public ExprAST { |
| 52 | double Val; |
| 53 | public: |
| 54 | explicit NumberExprAST(double val) : Val(val) {} |
| 55 | virtual Value *Codegen(); |
| 56 | }; |
| 57 | ... |
| 58 | </pre> |
| 59 | </div> |
| 60 | |
| 61 | |
| 62 | |
| 63 | </div> |
| 64 | |
| 65 | <!-- *********************************************************************** --> |
| 66 | <hr> |
| 67 | <address> |
| 68 | <a href="http://jigsaw.w3.org/css-validator/check/referer"><img |
| 69 | src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a> |
| 70 | <a href="http://validator.w3.org/check/referer"><img |
| 71 | src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a> |
| 72 | |
| 73 | <a href="mailto:sabre@nondot.org">Chris Lattner</a><br> |
| 74 | <a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br> |
| 75 | Last modified: $Date: 2007-10-17 11:05:13 -0700 (Wed, 17 Oct 2007) $ |
| 76 | </address> |
| 77 | </body> |
| 78 | </html> |