<body>
-<div class="doc_title">Kaleidoscope: Code generation to LLVM IR</div>
+<h1>Kaleidoscope: Code generation to LLVM IR</h1>
<ul>
<li><a href="index.html">Up to Tutorial Index</a></li>
</div>
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-<div class="doc_section"><a name="intro">Chapter 3 Introduction</a></div>
+<h2><a name="intro">Chapter 3 Introduction</a></h2>
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-<div class="doc_text">
+<div>
<p>Welcome to Chapter 3 of the "<a href="index.html">Implementing a language
with LLVM</a>" tutorial. This chapter shows you how to transform the <a
</div>
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-<div class="doc_section"><a name="basics">Code Generation Setup</a></div>
+<h2><a name="basics">Code Generation Setup</a></h2>
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-<div class="doc_text">
+<div>
<p>
In order to generate LLVM IR, we want some simple setup to get started. First
<pre>
exception Error of string
-let the_module = create_module (global_context ()) "my cool jit"
-let builder = builder (global_context ())
+let context = global_context ()
+let the_module = create_module context "my cool jit"
+let builder = builder context
let named_values:(string, llvalue) Hashtbl.t = Hashtbl.create 10
let double_type = double_type context
</pre>
</div>
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-<div class="doc_section"><a name="exprs">Expression Code Generation</a></div>
+<h2><a name="exprs">Expression Code Generation</a></h2>
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-<div class="doc_text">
+<div>
<p>Generating LLVM code for expression nodes is very straightforward: less
than 30 lines of commented code for all four of our expression nodes. First
let rhs_val = codegen_expr rhs in
begin
match op with
- | '+' -> build_add lhs_val rhs_val "addtmp" builder
- | '-' -> build_sub lhs_val rhs_val "subtmp" builder
- | '*' -> build_mul lhs_val rhs_val "multmp" builder
+ | '+' -> build_fadd lhs_val rhs_val "addtmp" builder
+ | '-' -> build_fsub lhs_val rhs_val "subtmp" builder
+ | '*' -> build_fmul lhs_val rhs_val "multmp" builder
| '<' ->
(* Convert bool 0/1 to double 0.0 or 1.0 *)
let i = build_fcmp Fcmp.Ult lhs_val rhs_val "cmptmp" builder in
</div>
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-<div class="doc_section"><a name="funcs">Function Code Generation</a></div>
+<h2><a name="funcs">Function Code Generation</a></h2>
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-<div class="doc_text">
+<div>
<p>Code generation for prototypes and functions must handle a number of
details, which make their code less beautiful than expression code
</div>
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-<div class="doc_section"><a name="driver">Driver Changes and
-Closing Thoughts</a></div>
+<h2><a name="driver">Driver Changes and Closing Thoughts</a></h2>
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-<div class="doc_text">
+<div>
<p>
For now, code generation to LLVM doesn't really get us much, except that we can
Read function definition:
define double @bar(double %a) {
entry:
- %calltmp = call double @foo( double %a, double 4.000000e+00 )
- %calltmp1 = call double @bar( double 3.133700e+04 )
+ %calltmp = call double @foo(double %a, double 4.000000e+00)
+ %calltmp1 = call double @bar(double 3.133700e+04)
%addtmp = fadd double %calltmp, %calltmp1
ret double %addtmp
}
Read top-level expression:
define double @""() {
entry:
- %calltmp = call double @cos( double 1.234000e+00 )
+ %calltmp = call double @cos(double 1.234000e+00)
ret double %calltmp
}
</pre>
define double @bar(double %a) {
entry:
- %calltmp = call double @foo( double %a, double 4.000000e+00 )
- %calltmp1 = call double @bar( double 3.133700e+04 )
+ %calltmp = call double @foo(double %a, double 4.000000e+00)
+ %calltmp1 = call double @bar(double 3.133700e+04)
%addtmp = fadd double %calltmp, %calltmp1
ret double %addtmp
}
define double @""() {
entry:
- %calltmp = call double @cos( double 1.234000e+00 )
+ %calltmp = call double @cos(double 1.234000e+00)
ret double %calltmp
}
</pre>
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-<div class="doc_section"><a name="code">Full Code Listing</a></div>
+<h2><a name="code">Full Code Listing</a></h2>
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-<div class="doc_text">
+<div>
<p>
Here is the complete code listing for our running example, enhanced with the
<a href="mailto:sabre@nondot.org">Chris Lattner</a><br>
<a href="mailto:idadesub@users.sourceforge.net">Erick Tryzelaar</a><br>
- <a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
+ <a href="http://llvm.org/">The LLVM Compiler Infrastructure</a><br>
Last modified: $Date$
</address>
</body>
projects / oota-llvm.git / blobdiff