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| <title>Kaleidoscope: Adding JIT and Optimizer Support</title> |
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| <div class="doc_title">Kaleidoscope: Adding JIT and Optimizer Support</div> |
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| <div class="doc_author"> |
| <p>Written by <a href="mailto:sabre@nondot.org">Chris Lattner</a></p> |
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| <div class="doc_section"><a name="intro">Part 4 Introduction</a></div> |
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| <p>Welcome to part 4 of the "<a href="index.html">Implementing a language with |
| LLVM</a>" tutorial.</p> |
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| <div class="doc_section"><a name="basics">Code Generation setup</a></div> |
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| <p> |
| In order to generate LLVM IR, we want some simple setup to get started. First, |
| we define virtual codegen methods in each AST class:</p> |
| |
| <div class="doc_code"> |
| <pre> |
| /// ExprAST - Base class for all expression nodes. |
| class ExprAST { |
| public: |
| virtual ~ExprAST() {} |
| virtual Value *Codegen() = 0; |
| }; |
| |
| /// NumberExprAST - Expression class for numeric literals like "1.0". |
| class NumberExprAST : public ExprAST { |
| double Val; |
| public: |
| explicit NumberExprAST(double val) : Val(val) {} |
| virtual Value *Codegen(); |
| }; |
| ... |
| </pre> |
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| <address> |
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| <a href="mailto:sabre@nondot.org">Chris Lattner</a><br> |
| <a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br> |
| Last modified: $Date: 2007-10-17 11:05:13 -0700 (Wed, 17 Oct 2007) $ |
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