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Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]6 <title>Source Level Debugging with LLVM</title>
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9<body>
10
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]11<h1>Source Level Debugging with LLVM</h1>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]12
Reid Spencerd3f876c2004-11-01 08:19:36 +0000[diff] [blame]13<table class="layout" style="width:100%">
14 <tr class="layout">
15 <td class="left">
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]16<ul>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]17 <li><a href="#introduction">Introduction</a>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]18 <ol>
19 <li><a href="#phil">Philosophy behind LLVM debugging information</a></li>
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]20 <li><a href="#consumers">Debug information consumers</a></li>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]21 <li><a href="#debugopt">Debugging optimized code</a></li>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]22 </ol></li>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]23 <li><a href="#format">Debugging information format</a>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]24 <ol>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]25 <li><a href="#debug_info_descriptors">Debug information descriptors</a>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]26 <ul>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]27 <li><a href="#format_compile_units">Compile unit descriptors</a></li>
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]28 <li><a href="#format_files">File descriptors</a></li>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]29 <li><a href="#format_global_variables">Global variable descriptors</a></li>
30 <li><a href="#format_subprograms">Subprogram descriptors</a></li>
Jim Laskey3d11bee2006-03-15 19:10:52 +0000[diff] [blame]31 <li><a href="#format_blocks">Block descriptors</a></li>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]32 <li><a href="#format_basic_type">Basic type descriptors</a></li>
33 <li><a href="#format_derived_type">Derived type descriptors</a></li>
34 <li><a href="#format_composite_type">Composite type descriptors</a></li>
35 <li><a href="#format_subrange">Subrange descriptors</a></li>
36 <li><a href="#format_enumeration">Enumerator descriptors</a></li>
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]37 <li><a href="#format_variables">Local variables</a></li>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]38 </ul></li>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]39 <li><a href="#format_common_intrinsics">Debugger intrinsic functions</a>
40 <ul>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]41 <li><a href="#format_common_declare">llvm.dbg.declare</a></li>
Victor Hernandez67a1a542010-01-11 22:53:48 +0000[diff] [blame]42 <li><a href="#format_common_value">llvm.dbg.value</a></li>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]43 </ul></li>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]44 </ol></li>
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]45 <li><a href="#format_common_lifetime">Object lifetimes and scoping</a></li>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]46 <li><a href="#ccxx_frontend">C/C++ front-end specific debug information</a>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]47 <ol>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]48 <li><a href="#ccxx_compile_units">C/C++ source file information</a></li>
49 <li><a href="#ccxx_global_variable">C/C++ global variable information</a></li>
50 <li><a href="#ccxx_subprogram">C/C++ function information</a></li>
51 <li><a href="#ccxx_basic_types">C/C++ basic types</a></li>
52 <li><a href="#ccxx_derived_types">C/C++ derived types</a></li>
53 <li><a href="#ccxx_composite_types">C/C++ struct/union types</a></li>
54 <li><a href="#ccxx_enumeration_types">C/C++ enumeration types</a></li>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]55 </ol></li>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]56</ul>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]57</td>
Reid Spencerd3f876c2004-11-01 08:19:36 +0000[diff] [blame]58<td class="right">
Misha Brukmane849a1a2004-05-12 21:26:16 +0000[diff] [blame]59<img src="img/venusflytrap.jpg" alt="A leafy and green bug eater" width="247"
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]60height="369">
61</td>
Reid Spencerd3f876c2004-11-01 08:19:36 +0000[diff] [blame]62</tr></table>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]63
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]64<div class="doc_author">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]65 <p>Written by <a href="mailto:sabre@nondot.org">Chris Lattner</a>
Jim Laskeyc760a922007-03-14 19:32:21 +0000[diff] [blame]66 and <a href="mailto:jlaskey@mac.com">Jim Laskey</a></p>
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]67</div>
68
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]69
70<!-- *********************************************************************** -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]71<h2><a name="introduction">Introduction</a></h2>
Misha Brukman94218a72004-12-09 20:27:37 +0000[diff] [blame]72<!-- *********************************************************************** -->
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]73
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]74<div>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]75
76<p>This document is the central repository for all information pertaining to
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]77 debug information in LLVM. It describes the <a href="#format">actual format
78 that the LLVM debug information</a> takes, which is useful for those
79 interested in creating front-ends or dealing directly with the information.
Chris Lattner8ad2f982009-07-18 21:47:15 +0000[diff] [blame]80 Further, this document provides specific examples of what debug information
Chris Lattner89940752011-01-18 06:12:10 +0000[diff] [blame]81 for C/C++ looks like.</p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]82
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]83<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]84<h3>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]85 <a name="phil">Philosophy behind LLVM debugging information</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]86</h3>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]87
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]88<div>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]89
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]90<p>The idea of the LLVM debugging information is to capture how the important
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]91 pieces of the source-language's Abstract Syntax Tree map onto LLVM code.
92 Several design aspects have shaped the solution that appears here. The
93 important ones are:</p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]94
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]95<ul>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]96 <li>Debugging information should have very little impact on the rest of the
97 compiler. No transformations, analyses, or code generators should need to
98 be modified because of debugging information.</li>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]99
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]100 <li>LLVM optimizations should interact in <a href="#debugopt">well-defined and
101 easily described ways</a> with the debugging information.</li>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]102
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]103 <li>Because LLVM is designed to support arbitrary programming languages,
104 LLVM-to-LLVM tools should not need to know anything about the semantics of
105 the source-level-language.</li>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]106
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]107 <li>Source-level languages are often <b>widely</b> different from one another.
108 LLVM should not put any restrictions of the flavor of the source-language,
109 and the debugging information should work with any language.</li>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]110
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]111 <li>With code generator support, it should be possible to use an LLVM compiler
112 to compile a program to native machine code and standard debugging
113 formats. This allows compatibility with traditional machine-code level
114 debuggers, like GDB or DBX.</li>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]115</ul>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]116
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]117<p>The approach used by the LLVM implementation is to use a small set
118 of <a href="#format_common_intrinsics">intrinsic functions</a> to define a
119 mapping between LLVM program objects and the source-level objects. The
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]120 description of the source-level program is maintained in LLVM metadata
121 in an <a href="#ccxx_frontend">implementation-defined format</a>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]122 (the C/C++ front-end currently uses working draft 7 of
123 the <a href="http://www.eagercon.com/dwarf/dwarf3std.htm">DWARF 3
124 standard</a>).</p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]125
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]126<p>When a program is being debugged, a debugger interacts with the user and
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]127 turns the stored debug information into source-language specific information.
128 As such, a debugger must be aware of the source-language, and is thus tied to
129 a specific language or family of languages.</p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]130
131</div>
132
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]133<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]134<h3>
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]135 <a name="consumers">Debug information consumers</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]136</h3>
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]137
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]138<div>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]139
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]140<p>The role of debug information is to provide meta information normally
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]141 stripped away during the compilation process. This meta information provides
142 an LLVM user a relationship between generated code and the original program
143 source code.</p>
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]144
Chris Lattnerc3107782010-04-05 04:11:11 +0000[diff] [blame]145<p>Currently, debug information is consumed by DwarfDebug to produce dwarf
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]146 information used by the gdb debugger. Other targets could use the same
147 information to produce stabs or other debug forms.</p>
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]148
149<p>It would also be reasonable to use debug information to feed profiling tools
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]150 for analysis of generated code, or, tools for reconstructing the original
151 source from generated code.</p>
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]152
153<p>TODO - expound a bit more.</p>
154
155</div>
156
157<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]158<h3>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]159 <a name="debugopt">Debugging optimized code</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]160</h3>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]161
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]162<div>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]163
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]164<p>An extremely high priority of LLVM debugging information is to make it
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]165 interact well with optimizations and analysis. In particular, the LLVM debug
166 information provides the following guarantees:</p>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]167
168<ul>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]169 <li>LLVM debug information <b>always provides information to accurately read
170 the source-level state of the program</b>, regardless of which LLVM
171 optimizations have been run, and without any modification to the
172 optimizations themselves. However, some optimizations may impact the
173 ability to modify the current state of the program with a debugger, such
174 as setting program variables, or calling functions that have been
175 deleted.</li>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]176
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]177 <li>As desired, LLVM optimizations can be upgraded to be aware of the LLVM
178 debugging information, allowing them to update the debugging information
179 as they perform aggressive optimizations. This means that, with effort,
180 the LLVM optimizers could optimize debug code just as well as non-debug
181 code.</li>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]182
Devang Patele0bdc592011-05-31 17:45:27 +0000[diff] [blame]183 <li>LLVM debug information does not prevent optimizations from
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]184 happening (for example inlining, basic block reordering/merging/cleanup,
Devang Patelf729e912011-05-31 18:06:14 +0000[diff] [blame]185 tail duplication, etc).</li>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]186
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]187 <li>LLVM debug information is automatically optimized along with the rest of
188 the program, using existing facilities. For example, duplicate
189 information is automatically merged by the linker, and unused information
190 is automatically removed.</li>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]191</ul>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]192
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]193<p>Basically, the debug information allows you to compile a program with
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]194 "<tt>-O0 -g</tt>" and get full debug information, allowing you to arbitrarily
195 modify the program as it executes from a debugger. Compiling a program with
196 "<tt>-O3 -g</tt>" gives you full debug information that is always available
197 and accurate for reading (e.g., you get accurate stack traces despite tail
198 call elimination and inlining), but you might lose the ability to modify the
199 program and call functions where were optimized out of the program, or
200 inlined away completely.</p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]201
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]202<p><a href="TestingGuide.html#quicktestsuite">LLVM test suite</a> provides a
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]203 framework to test optimizer's handling of debugging information. It can be
204 run like this:</p>
Devang Patela5c05aa2008-11-21 19:35:57 +0000[diff] [blame]205
206<div class="doc_code">
207<pre>
208% cd llvm/projects/test-suite/MultiSource/Benchmarks # or some other level
209% make TEST=dbgopt
210</pre>
211</div>
212
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]213<p>This will test impact of debugging information on optimization passes. If
214 debugging information influences optimization passes then it will be reported
215 as a failure. See <a href="TestingGuide.html">TestingGuide</a> for more
216 information on LLVM test infrastructure and how to run various tests.</p>
Devang Patela5c05aa2008-11-21 19:35:57 +0000[diff] [blame]217
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]218</div>
219
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]220</div>
221
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]222<!-- *********************************************************************** -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]223<h2>
Chris Lattner8ff75902004-01-06 05:31:32 +0000[diff] [blame]224 <a name="format">Debugging information format</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]225</h2>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]226<!-- *********************************************************************** -->
227
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]228<div>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]229
230<p>LLVM debugging information has been carefully designed to make it possible
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]231 for the optimizer to optimize the program and debugging information without
232 necessarily having to know anything about debugging information. In
John Criswellb34500f2010-03-17 15:01:50 +0000[diff] [blame]233 particular, the use of metadata avoids duplicated debugging information from
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]234 the beginning, and the global dead code elimination pass automatically
235 deletes debugging information for a function if it decides to delete the
236 function. </p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]237
238<p>To do this, most of the debugging information (descriptors for types,
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]239 variables, functions, source files, etc) is inserted by the language
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]240 front-end in the form of LLVM metadata. </p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]241
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]242<p>Debug information is designed to be agnostic about the target debugger and
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]243 debugging information representation (e.g. DWARF/Stabs/etc). It uses a
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]244 generic pass to decode the information that represents variables, types,
245 functions, namespaces, etc: this allows for arbitrary source-language
246 semantics and type-systems to be used, as long as there is a module
247 written for the target debugger to interpret the information. </p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]248
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]249<p>To provide basic functionality, the LLVM debugger does have to make some
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]250 assumptions about the source-level language being debugged, though it keeps
251 these to a minimum. The only common features that the LLVM debugger assumes
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]252 exist are <a href="#format_files">source files</a>,
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]253 and <a href="#format_global_variables">program objects</a>. These abstract
254 objects are used by a debugger to form stack traces, show information about
255 local variables, etc.</p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]256
257<p>This section of the documentation first describes the representation aspects
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]258 common to any source-language. The <a href="#ccxx_frontend">next section</a>
259 describes the data layout conventions used by the C and C++ front-ends.</p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]260
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]261<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]262<h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]263 <a name="debug_info_descriptors">Debug information descriptors</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]264</h3>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]265
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]266<div>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]267
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]268<p>In consideration of the complexity and volume of debug information, LLVM
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]269 provides a specification for well formed debug descriptors. </p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]270
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]271<p>Consumers of LLVM debug information expect the descriptors for program
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]272 objects to start in a canonical format, but the descriptors can include
273 additional information appended at the end that is source-language
274 specific. All LLVM debugging information is versioned, allowing backwards
275 compatibility in the case that the core structures need to change in some
276 way. Also, all debugging information objects start with a tag to indicate
277 what type of object it is. The source-language is allowed to define its own
278 objects, by using unreserved tag numbers. We recommend using with tags in
Benjamin Kramer8040cd32009-10-12 14:46:08 +0000[diff] [blame]279 the range 0x1000 through 0x2000 (there is a defined enum DW_TAG_user_base =
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]280 0x1000.)</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]281
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]282<p>The fields of debug descriptors used internally by LLVM
Nick Lewycky655fd032010-03-31 07:50:17 +0000[diff] [blame]283 are restricted to only the simple data types <tt>i32</tt>, <tt>i1</tt>,
284 <tt>float</tt>, <tt>double</tt>, <tt>mdstring</tt> and <tt>mdnode</tt>. </p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]285
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]286<div class="doc_code">
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]287<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]288!1 = metadata !{
Nick Lewycky655fd032010-03-31 07:50:17 +0000[diff] [blame]289 i32, ;; A tag
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]290 ...
291}
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]292</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]293</div>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]294
Jim Laskey7089f452006-06-16 13:14:03 +0000[diff] [blame]295<p><a name="LLVMDebugVersion">The first field of a descriptor is always an
Nick Lewycky655fd032010-03-31 07:50:17 +0000[diff] [blame]296 <tt>i32</tt> containing a tag value identifying the content of the
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]297 descriptor. The remaining fields are specific to the descriptor. The values
298 of tags are loosely bound to the tag values of DWARF information entries.
299 However, that does not restrict the use of the information supplied to DWARF
300 targets. To facilitate versioning of debug information, the tag is augmented
Nick Lewyckyf3379da2011-07-25 21:13:23 +0000[diff] [blame]301 with the current debug version (LLVMDebugVersion = 8 &lt;&lt; 16 or
302 0x80000 or 524288.)</a></p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]303
Jim Laskey7089f452006-06-16 13:14:03 +0000[diff] [blame]304<p>The details of the various descriptors follow.</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]305
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]306<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]307<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]308 <a name="format_compile_units">Compile unit descriptors</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]309</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]310
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]311<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]312
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]313<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]314<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]315!0 = metadata !{
316 i32, ;; Tag = 17 + <a href="#LLVMDebugVersion">LLVMDebugVersion</a>
317 ;; (DW_TAG_compile_unit)
318 i32, ;; Unused field.
319 i32, ;; DWARF language identifier (ex. DW_LANG_C89)
320 metadata, ;; Source file name
321 metadata, ;; Source file directory (includes trailing slash)
322 metadata ;; Producer (ex. "4.0.1 LLVM (LLVM research group)")
323 i1, ;; True if this is a main compile unit.
324 i1, ;; True if this is optimized.
325 metadata, ;; Flags
326 i32 ;; Runtime version
Devang Patel9b4a2ac2011-09-09 17:07:15 +0000[diff] [blame]327 metadata ;; List of enums types
328 metadata ;; List of retained types
329 metadata ;; List of subprograms
330 metadata ;; List of global variables
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]331}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]332</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]333</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]334
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]335<p>These descriptors contain a source language ID for the file (we use the DWARF
336 3.0 ID numbers, such as <tt>DW_LANG_C89</tt>, <tt>DW_LANG_C_plus_plus</tt>,
337 <tt>DW_LANG_Cobol74</tt>, etc), three strings describing the filename,
338 working directory of the compiler, and an identifier string for the compiler
339 that produced it.</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]340
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]341<p>Compile unit descriptors provide the root context for objects declared in a
Devang Patel464f4ef2011-05-03 16:18:28 +0000[diff] [blame]342 specific compilation unit. File descriptors are defined using this context.
343 These descriptors are collected by a named metadata
Devang Patel9b4a2ac2011-09-09 17:07:15 +0000[diff] [blame]344 <tt>!llvm.dbg.cu</tt>. Compile unit descriptor keeps track of subprograms,
345 global variables and type information.
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]346
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]347</div>
348
349<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]350<h4>
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]351 <a name="format_files">File descriptors</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]352</h4>
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]353
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]354<div>
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]355
356<div class="doc_code">
357<pre>
358!0 = metadata !{
359 i32, ;; Tag = 41 + <a href="#LLVMDebugVersion">LLVMDebugVersion</a>
360 ;; (DW_TAG_file_type)
361 metadata, ;; Source file name
362 metadata, ;; Source file directory (includes trailing slash)
Devang Patel94c7ddb2011-08-16 22:09:43 +0000[diff] [blame]363 metadata ;; Unused
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]364}
365</pre>
366</div>
367
John Criswellb34500f2010-03-17 15:01:50 +0000[diff] [blame]368<p>These descriptors contain information for a file. Global variables and top
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]369 level functions would be defined using this context.k File descriptors also
370 provide context for source line correspondence. </p>
371
372<p>Each input file is encoded as a separate file descriptor in LLVM debugging
Devang Patel94c7ddb2011-08-16 22:09:43 +0000[diff] [blame]373 information output. </p>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]374
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]375</div>
376
377<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]378<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]379 <a name="format_global_variables">Global variable descriptors</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]380</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]381
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]382<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]383
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]384<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]385<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]386!1 = metadata !{
387 i32, ;; Tag = 52 + <a href="#LLVMDebugVersion">LLVMDebugVersion</a>
388 ;; (DW_TAG_variable)
389 i32, ;; Unused field.
390 metadata, ;; Reference to context descriptor
391 metadata, ;; Name
392 metadata, ;; Display name (fully qualified C++ name)
393 metadata, ;; MIPS linkage name (for C++)
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]394 metadata, ;; Reference to file where defined
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]395 i32, ;; Line number where defined
396 metadata, ;; Reference to type descriptor
397 i1, ;; True if the global is local to compile unit (static)
398 i1, ;; True if the global is defined in the compile unit (not extern)
Dan Gohmanfe47aae2010-05-28 17:13:49 +0000[diff] [blame]399 {}* ;; Reference to the global variable
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]400}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]401</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]402</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]403
404<p>These descriptors provide debug information about globals variables. The
Devang Patelda6eed32011-03-29 17:27:08 +0000[diff] [blame]405provide details such as name, type and where the variable is defined. All
406global variables are collected by named metadata <tt>!llvm.dbg.gv</tt>.</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]407
408</div>
409
410<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]411<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]412 <a name="format_subprograms">Subprogram descriptors</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]413</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]414
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]415<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]416
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]417<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]418<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]419!2 = metadata !{
420 i32, ;; Tag = 46 + <a href="#LLVMDebugVersion">LLVMDebugVersion</a>
421 ;; (DW_TAG_subprogram)
422 i32, ;; Unused field.
423 metadata, ;; Reference to context descriptor
424 metadata, ;; Name
425 metadata, ;; Display name (fully qualified C++ name)
426 metadata, ;; MIPS linkage name (for C++)
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]427 metadata, ;; Reference to file where defined
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]428 i32, ;; Line number where defined
429 metadata, ;; Reference to type descriptor
430 i1, ;; True if the global is local to compile unit (static)
Devang Patel5e06bb82011-04-22 23:10:17 +0000[diff] [blame]431 i1, ;; True if the global is defined in the compile unit (not extern)
432 i32, ;; Virtuality, e.g. dwarf::DW_VIRTUALITY__virtual
433 i32, ;; Index into a virtual function
Devang Patel80ecc152010-06-04 22:49:55 +0000[diff] [blame]434 metadata, ;; indicates which base type contains the vtable pointer for the
435 ;; derived class
Devang Patel5e06bb82011-04-22 23:10:17 +0000[diff] [blame]436 i1, ;; isArtificial
437 i1, ;; isOptimized
438 Function *,;; Pointer to LLVM function
439 metadata, ;; Lists function template parameters
440 metadata ;; Function declaration descriptor
Devang Patel93d39be2011-08-19 23:28:12 +0000[diff] [blame]441 metadata ;; List of function variables
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]442}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]443</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]444</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]445
446<p>These descriptors provide debug information about functions, methods and
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]447 subprograms. They provide details such as name, return types and the source
Devang Patelda6eed32011-03-29 17:27:08 +0000[diff] [blame]448 location where the subprogram is defined.
449 All subprogram descriptors are collected by a named metadata
450 <tt>!llvm.dbg.sp</tt>.
451</p>
Jim Laskey3d11bee2006-03-15 19:10:52 +0000[diff] [blame]452
453</div>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]454
Jim Laskey3d11bee2006-03-15 19:10:52 +0000[diff] [blame]455<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]456<h4>
Jim Laskey3d11bee2006-03-15 19:10:52 +0000[diff] [blame]457 <a name="format_blocks">Block descriptors</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]458</h4>
Jim Laskey3d11bee2006-03-15 19:10:52 +0000[diff] [blame]459
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]460<div>
Jim Laskey3d11bee2006-03-15 19:10:52 +0000[diff] [blame]461
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]462<div class="doc_code">
Jim Laskey3d11bee2006-03-15 19:10:52 +0000[diff] [blame]463<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]464!3 = metadata !{
Devang Patelc79dda22010-10-04 16:51:59 +0000[diff] [blame]465 i32, ;; Tag = 11 + <a href="#LLVMDebugVersion">LLVMDebugVersion</a> (DW_TAG_lexical_block)
Devang Patel7f271fc2010-10-01 22:45:00 +0000[diff] [blame]466 metadata,;; Reference to context descriptor
467 i32, ;; Line number
Devang Patel90d81f12011-03-08 16:25:29 +0000[diff] [blame]468 i32, ;; Column number
469 metadata,;; Reference to source file
470 i32 ;; Unique ID to identify blocks from a template function
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]471}
Jim Laskey3d11bee2006-03-15 19:10:52 +0000[diff] [blame]472</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]473</div>
Jim Laskey3d11bee2006-03-15 19:10:52 +0000[diff] [blame]474
Eric Christopher6618a242011-10-11 22:59:11 +0000[diff] [blame]475<p>This descriptor provides debug information about nested blocks within a
Devang Patel7f271fc2010-10-01 22:45:00 +0000[diff] [blame]476 subprogram. The line number and column numbers are used to dinstinguish
477 two lexical blocks at same depth. </p>
Jim Laskey3d11bee2006-03-15 19:10:52 +0000[diff] [blame]478
Eric Christopher6618a242011-10-11 22:59:11 +0000[diff] [blame]479<div class="doc_code">
480<pre>
481!3 = metadata !{
482 i32, ;; Tag = 11 + <a href="#LLVMDebugVersion">LLVMDebugVersion</a> (DW_TAG_lexical_block)
483 metadata ;; Reference to the scope we're annotating with a file change
484 metadata,;; Reference to the file the scope is enclosed in.
485}
486</pre>
487</div>
488
489<p>This descriptor provides a wrapper around a lexical scope to handle file
490 changes in the middle of a lexical block.</p>
491
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]492</div>
493
494<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]495<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]496 <a name="format_basic_type">Basic type descriptors</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]497</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]498
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]499<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]500
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]501<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]502<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]503!4 = metadata !{
504 i32, ;; Tag = 36 + <a href="#LLVMDebugVersion">LLVMDebugVersion</a>
505 ;; (DW_TAG_base_type)
Devang Patel94c7ddb2011-08-16 22:09:43 +0000[diff] [blame]506 metadata, ;; Reference to context
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]507 metadata, ;; Name (may be "" for anonymous types)
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]508 metadata, ;; Reference to file where defined (may be NULL)
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]509 i32, ;; Line number where defined (may be 0)
510 i64, ;; Size in bits
511 i64, ;; Alignment in bits
512 i64, ;; Offset in bits
513 i32, ;; Flags
514 i32 ;; DWARF type encoding
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]515}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]516</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]517</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]518
519<p>These descriptors define primitive types used in the code. Example int, bool
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]520 and float. The context provides the scope of the type, which is usually the
Devang Patel94c7ddb2011-08-16 22:09:43 +0000[diff] [blame]521 top level. Since basic types are not usually user defined the context
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]522 and line number can be left as NULL and 0. The size, alignment and offset
523 are expressed in bits and can be 64 bit values. The alignment is used to
524 round the offset when embedded in a
525 <a href="#format_composite_type">composite type</a> (example to keep float
526 doubles on 64 bit boundaries.) The offset is the bit offset if embedded in
527 a <a href="#format_composite_type">composite type</a>.</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]528
529<p>The type encoding provides the details of the type. The values are typically
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]530 one of the following:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]531
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]532<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]533<pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]534DW_ATE_address = 1
535DW_ATE_boolean = 2
536DW_ATE_float = 4
537DW_ATE_signed = 5
538DW_ATE_signed_char = 6
539DW_ATE_unsigned = 7
540DW_ATE_unsigned_char = 8
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]541</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]542</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]543
544</div>
545
546<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]547<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]548 <a name="format_derived_type">Derived type descriptors</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]549</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]550
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]551<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]552
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]553<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]554<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]555!5 = metadata !{
556 i32, ;; Tag (see below)
557 metadata, ;; Reference to context
558 metadata, ;; Name (may be "" for anonymous types)
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]559 metadata, ;; Reference to file where defined (may be NULL)
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]560 i32, ;; Line number where defined (may be 0)
Devang Patel0ffd10b2010-10-01 19:19:30 +0000[diff] [blame]561 i64, ;; Size in bits
562 i64, ;; Alignment in bits
563 i64, ;; Offset in bits
Devang Patele9db5e22011-04-16 00:11:51 +0000[diff] [blame]564 metadata, ;; Reference to type derived from
565 metadata, ;; (optional) Name of the Objective C property assoicated with
566 ;; Objective-C an ivar
567 metadata, ;; (optional) Name of the Objective C property getter selector.
568 metadata, ;; (optional) Name of the Objective C property setter selector.
569 i32 ;; (optional) Objective C property attributes.
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]570}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]571</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]572</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]573
574<p>These descriptors are used to define types derived from other types. The
575value of the tag varies depending on the meaning. The following are possible
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]576tag values:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]577
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]578<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]579<pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]580DW_TAG_formal_parameter = 5
581DW_TAG_member = 13
582DW_TAG_pointer_type = 15
583DW_TAG_reference_type = 16
584DW_TAG_typedef = 22
585DW_TAG_const_type = 38
586DW_TAG_volatile_type = 53
587DW_TAG_restrict_type = 55
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]588</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]589</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]590
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]591<p><tt>DW_TAG_member</tt> is used to define a member of
592 a <a href="#format_composite_type">composite type</a>
593 or <a href="#format_subprograms">subprogram</a>. The type of the member is
594 the <a href="#format_derived_type">derived
595 type</a>. <tt>DW_TAG_formal_parameter</tt> is used to define a member which
596 is a formal argument of a subprogram.</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]597
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]598<p><tt>DW_TAG_typedef</tt> is used to provide a name for the derived type.</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]599
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]600<p><tt>DW_TAG_pointer_type</tt>,<tt>DW_TAG_reference_type</tt>,
601 <tt>DW_TAG_const_type</tt>, <tt>DW_TAG_volatile_type</tt>
602 and <tt>DW_TAG_restrict_type</tt> are used to qualify
603 the <a href="#format_derived_type">derived type</a>. </p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]604
605<p><a href="#format_derived_type">Derived type</a> location can be determined
Devang Patel94c7ddb2011-08-16 22:09:43 +0000[diff] [blame]606 from the context and line number. The size, alignment and offset are
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]607 expressed in bits and can be 64 bit values. The alignment is used to round
608 the offset when embedded in a <a href="#format_composite_type">composite
609 type</a> (example to keep float doubles on 64 bit boundaries.) The offset is
610 the bit offset if embedded in a <a href="#format_composite_type">composite
611 type</a>.</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]612
Devang Patel37280782011-02-03 00:22:17 +0000[diff] [blame]613<p>Note that the <tt>void *</tt> type is expressed as a type derived from NULL.
614</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]615
616</div>
617
618<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]619<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]620 <a name="format_composite_type">Composite type descriptors</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]621</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]622
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]623<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]624
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]625<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]626<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]627!6 = metadata !{
628 i32, ;; Tag (see below)
629 metadata, ;; Reference to context
630 metadata, ;; Name (may be "" for anonymous types)
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]631 metadata, ;; Reference to file where defined (may be NULL)
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]632 i32, ;; Line number where defined (may be 0)
633 i64, ;; Size in bits
634 i64, ;; Alignment in bits
635 i64, ;; Offset in bits
636 i32, ;; Flags
637 metadata, ;; Reference to type derived from
638 metadata, ;; Reference to array of member descriptors
639 i32 ;; Runtime languages
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]640}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]641</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]642</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]643
644<p>These descriptors are used to define types that are composed of 0 or more
645elements. The value of the tag varies depending on the meaning. The following
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]646are possible tag values:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]647
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]648<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]649<pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]650DW_TAG_array_type = 1
651DW_TAG_enumeration_type = 4
652DW_TAG_structure_type = 19
653DW_TAG_union_type = 23
654DW_TAG_vector_type = 259
Bruno Cardoso Lopesd80ddc02009-05-29 17:08:57 +0000[diff] [blame]655DW_TAG_subroutine_type = 21
656DW_TAG_inheritance = 28
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]657</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]658</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]659
Jim Laskeyf8a01a92006-06-15 20:51:43 +0000[diff] [blame]660<p>The vector flag indicates that an array type is a native packed vector.</p>
661
Jim Laskey7089f452006-06-16 13:14:03 +0000[diff] [blame]662<p>The members of array types (tag = <tt>DW_TAG_array_type</tt>) or vector types
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]663 (tag = <tt>DW_TAG_vector_type</tt>) are <a href="#format_subrange">subrange
664 descriptors</a>, each representing the range of subscripts at that level of
665 indexing.</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]666
667<p>The members of enumeration types (tag = <tt>DW_TAG_enumeration_type</tt>) are
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]668 <a href="#format_enumeration">enumerator descriptors</a>, each representing
Devang Patelda6eed32011-03-29 17:27:08 +0000[diff] [blame]669 the definition of enumeration value for the set. All enumeration type
670 descriptors are collected by named metadata <tt>!llvm.dbg.enum</tt>.</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]671
672<p>The members of structure (tag = <tt>DW_TAG_structure_type</tt>) or union (tag
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]673 = <tt>DW_TAG_union_type</tt>) types are any one of
674 the <a href="#format_basic_type">basic</a>,
675 <a href="#format_derived_type">derived</a>
676 or <a href="#format_composite_type">composite</a> type descriptors, each
677 representing a field member of the structure or union.</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]678
Jim Laskey4a9df242006-08-21 21:21:06 +0000[diff] [blame]679<p>For C++ classes (tag = <tt>DW_TAG_structure_type</tt>), member descriptors
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]680 provide information about base classes, static members and member
681 functions. If a member is a <a href="#format_derived_type">derived type
682 descriptor</a> and has a tag of <tt>DW_TAG_inheritance</tt>, then the type
683 represents a base class. If the member of is
684 a <a href="#format_global_variables">global variable descriptor</a> then it
685 represents a static member. And, if the member is
686 a <a href="#format_subprograms">subprogram descriptor</a> then it represents
687 a member function. For static members and member
688 functions, <tt>getName()</tt> returns the members link or the C++ mangled
689 name. <tt>getDisplayName()</tt> the simplied version of the name.</p>
Jim Laskey4a9df242006-08-21 21:21:06 +0000[diff] [blame]690
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]691<p>The first member of subroutine (tag = <tt>DW_TAG_subroutine_type</tt>) type
692 elements is the return type for the subroutine. The remaining elements are
693 the formal arguments to the subroutine.</p>
Jim Laskey094ee722006-06-20 21:13:20 +0000[diff] [blame]694
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]695<p><a href="#format_composite_type">Composite type</a> location can be
Devang Patel94c7ddb2011-08-16 22:09:43 +0000[diff] [blame]696 determined from the context and line number. The size, alignment and
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]697 offset are expressed in bits and can be 64 bit values. The alignment is used
698 to round the offset when embedded in
699 a <a href="#format_composite_type">composite type</a> (as an example, to keep
700 float doubles on 64 bit boundaries.) The offset is the bit offset if embedded
701 in a <a href="#format_composite_type">composite type</a>.</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]702
703</div>
704
705<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]706<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]707 <a name="format_subrange">Subrange descriptors</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]708</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]709
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]710<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]711
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]712<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]713<pre>
Devang Patel37280782011-02-03 00:22:17 +0000[diff] [blame]714!42 = metadata !{
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]715 i32, ;; Tag = 33 + <a href="#LLVMDebugVersion">LLVMDebugVersion</a> (DW_TAG_subrange_type)
716 i64, ;; Low value
717 i64 ;; High value
718}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]719</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]720</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]721
722<p>These descriptors are used to define ranges of array subscripts for an array
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]723 <a href="#format_composite_type">composite type</a>. The low value defines
724 the lower bounds typically zero for C/C++. The high value is the upper
725 bounds. Values are 64 bit. High - low + 1 is the size of the array. If low
Devang Patel3f932a72011-04-08 23:39:38 +0000[diff] [blame]726 > high the array bounds are not included in generated debugging information.
727</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]728
729</div>
730
731<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]732<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]733 <a name="format_enumeration">Enumerator descriptors</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]734</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]735
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]736<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]737
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]738<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]739<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]740!6 = metadata !{
741 i32, ;; Tag = 40 + <a href="#LLVMDebugVersion">LLVMDebugVersion</a>
742 ;; (DW_TAG_enumerator)
743 metadata, ;; Name
744 i64 ;; Value
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]745}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]746</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]747</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]748
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]749<p>These descriptors are used to define members of an
750 enumeration <a href="#format_composite_type">composite type</a>, it
751 associates the name to the value.</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]752
753</div>
754
755<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]756<h4>
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]757 <a name="format_variables">Local variables</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]758</h4>
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]759
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]760<div>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]761
762<div class="doc_code">
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]763<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]764!7 = metadata !{
765 i32, ;; Tag (see below)
766 metadata, ;; Context
767 metadata, ;; Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]768 metadata, ;; Reference to file where defined
Devang Patela83688f2011-03-08 16:29:40 +0000[diff] [blame]769 i32, ;; 24 bit - Line number where defined
770 ;; 8 bit - Argument number. 1 indicates 1st argument.
Devang Patel0a2a3062011-07-27 18:14:50 +0000[diff] [blame]771 metadata, ;; Type descriptor
772 i32, ;; flags
773 metadata ;; (optional) Reference to inline location
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]774}
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]775</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]776</div>
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]777
778<p>These descriptors are used to define variables local to a sub program. The
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]779 value of the tag depends on the usage of the variable:</p>
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]780
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]781<div class="doc_code">
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]782<pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]783DW_TAG_auto_variable = 256
784DW_TAG_arg_variable = 257
785DW_TAG_return_variable = 258
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]786</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]787</div>
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]788
789<p>An auto variable is any variable declared in the body of the function. An
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]790 argument variable is any variable that appears as a formal argument to the
791 function. A return variable is used to track the result of a function and
792 has no source correspondent.</p>
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]793
Jim Laskey2d395d92006-03-24 09:20:27 +0000[diff] [blame]794<p>The context is either the subprogram or block where the variable is defined.
Devang Patel94c7ddb2011-08-16 22:09:43 +0000[diff] [blame]795 Name the source variable name. Context and line indicate where the
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]796 variable was defined. Type descriptor defines the declared type of the
797 variable.</p>
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]798
799</div>
800
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]801</div>
802
Jim Laskey383e0092006-03-23 17:54:33 +0000[diff] [blame]803<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]804<h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]805 <a name="format_common_intrinsics">Debugger intrinsic functions</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]806</h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]807
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]808<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]809
810<p>LLVM uses several intrinsic functions (name prefixed with "llvm.dbg") to
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]811 provide debug information at various points in generated code.</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]812
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]813<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]814<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]815 <a name="format_common_declare">llvm.dbg.declare</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]816</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]817
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]818<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]819<pre>
Devang Patel4c7c0c62010-10-01 19:22:16 +0000[diff] [blame]820 void %<a href="#format_common_declare">llvm.dbg.declare</a>(metadata, metadata)
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]821</pre>
822
Jim Laskey2d395d92006-03-24 09:20:27 +0000[diff] [blame]823<p>This intrinsic provides information about a local element (ex. variable.) The
NAKAMURA Takumi4d6deb02011-04-09 09:51:57 +0000[diff] [blame]824 first argument is metadata holding alloca for the variable. The
Devang Patele136e502011-02-01 17:22:12 +0000[diff] [blame]825 second argument is metadata containing description of the variable. </p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]826</div>
827
828<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]829<h4>
Victor Hernandez67a1a542010-01-11 22:53:48 +0000[diff] [blame]830 <a name="format_common_value">llvm.dbg.value</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]831</h4>
Victor Hernandez67a1a542010-01-11 22:53:48 +0000[diff] [blame]832
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]833<div>
Victor Hernandez67a1a542010-01-11 22:53:48 +0000[diff] [blame]834<pre>
Dan Gohman3dfb3cf2010-05-28 17:07:41 +0000[diff] [blame]835 void %<a href="#format_common_value">llvm.dbg.value</a>(metadata, i64, metadata)
Victor Hernandez67a1a542010-01-11 22:53:48 +0000[diff] [blame]836</pre>
837
838<p>This intrinsic provides information when a user source variable is set to a
839 new value. The first argument is the new value (wrapped as metadata). The
840 second argument is the offset in the user source variable where the new value
Devang Patele136e502011-02-01 17:22:12 +0000[diff] [blame]841 is written. The third argument is metadata containing description of the
842 user source variable. </p>
Victor Hernandez67a1a542010-01-11 22:53:48 +0000[diff] [blame]843</div>
844
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]845</div>
846
Victor Hernandez67a1a542010-01-11 22:53:48 +0000[diff] [blame]847<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]848<h3>
Chris Lattner8ff75902004-01-06 05:31:32 +0000[diff] [blame]849 <a name="format_common_lifetime">Object lifetimes and scoping</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]850</h3>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]851
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]852<div>
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]853<p>In many languages, the local variables in functions can have their lifetimes
854 or scopes limited to a subset of a function. In the C family of languages,
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]855 for example, variables are only live (readable and writable) within the
856 source block that they are defined in. In functional languages, values are
857 only readable after they have been defined. Though this is a very obvious
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]858 concept, it is non-trivial to model in LLVM, because it has no notion of
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]859 scoping in this sense, and does not want to be tied to a language's scoping
860 rules.</p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]861
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]862<p>In order to handle this, the LLVM debug format uses the metadata attached to
Nick Lewycky655fd032010-03-31 07:50:17 +0000[diff] [blame]863 llvm instructions to encode line number and scoping information. Consider
864 the following C fragment, for example:</p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]865
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]866<div class="doc_code">
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]867<pre>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]8681. void foo() {
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]8692. int X = 21;
8703. int Y = 22;
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]8714. {
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]8725. int Z = 23;
8736. Z = X;
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]8747. }
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]8758. X = Y;
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]8769. }
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]877</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]878</div>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]879
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]880<p>Compiled to LLVM, this function would be represented like this:</p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]881
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]882<div class="doc_code">
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]883<pre>
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]884define void @foo() nounwind ssp {
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]885entry:
Bill Wendling02216ff2009-12-01 00:59:58 +0000[diff] [blame]886 %X = alloca i32, align 4 ; &lt;i32*&gt; [#uses=4]
887 %Y = alloca i32, align 4 ; &lt;i32*&gt; [#uses=4]
888 %Z = alloca i32, align 4 ; &lt;i32*&gt; [#uses=3]
Dan Gohmanfe47aae2010-05-28 17:13:49 +0000[diff] [blame]889 %0 = bitcast i32* %X to {}* ; &lt;{}*&gt; [#uses=1]
Devang Patel37280782011-02-03 00:22:17 +0000[diff] [blame]890 call void @llvm.dbg.declare(metadata !{i32 * %X}, metadata !0), !dbg !7
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]891 store i32 21, i32* %X, !dbg !8
Dan Gohmanfe47aae2010-05-28 17:13:49 +0000[diff] [blame]892 %1 = bitcast i32* %Y to {}* ; &lt;{}*&gt; [#uses=1]
Devang Patel37280782011-02-03 00:22:17 +0000[diff] [blame]893 call void @llvm.dbg.declare(metadata !{i32 * %Y}, metadata !9), !dbg !10
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]894 store i32 22, i32* %Y, !dbg !11
Dan Gohmanfe47aae2010-05-28 17:13:49 +0000[diff] [blame]895 %2 = bitcast i32* %Z to {}* ; &lt;{}*&gt; [#uses=1]
Devang Patel37280782011-02-03 00:22:17 +0000[diff] [blame]896 call void @llvm.dbg.declare(metadata !{i32 * %Z}, metadata !12), !dbg !14
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]897 store i32 23, i32* %Z, !dbg !15
Bill Wendling02216ff2009-12-01 00:59:58 +0000[diff] [blame]898 %tmp = load i32* %X, !dbg !16 ; &lt;i32&gt; [#uses=1]
899 %tmp1 = load i32* %Y, !dbg !16 ; &lt;i32&gt; [#uses=1]
900 %add = add nsw i32 %tmp, %tmp1, !dbg !16 ; &lt;i32&gt; [#uses=1]
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]901 store i32 %add, i32* %Z, !dbg !16
Bill Wendling02216ff2009-12-01 00:59:58 +0000[diff] [blame]902 %tmp2 = load i32* %Y, !dbg !17 ; &lt;i32&gt; [#uses=1]
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]903 store i32 %tmp2, i32* %X, !dbg !17
904 ret void, !dbg !18
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]905}
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]906
Devang Patel37280782011-02-03 00:22:17 +0000[diff] [blame]907declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]908
909!0 = metadata !{i32 459008, metadata !1, metadata !"X",
910 metadata !3, i32 2, metadata !6}; [ DW_TAG_auto_variable ]
911!1 = metadata !{i32 458763, metadata !2}; [DW_TAG_lexical_block ]
912!2 = metadata !{i32 458798, i32 0, metadata !3, metadata !"foo", metadata !"foo",
913 metadata !"foo", metadata !3, i32 1, metadata !4,
914 i1 false, i1 true}; [DW_TAG_subprogram ]
915!3 = metadata !{i32 458769, i32 0, i32 12, metadata !"foo.c",
916 metadata !"/private/tmp", metadata !"clang 1.1", i1 true,
917 i1 false, metadata !"", i32 0}; [DW_TAG_compile_unit ]
918!4 = metadata !{i32 458773, metadata !3, metadata !"", null, i32 0, i64 0, i64 0,
919 i64 0, i32 0, null, metadata !5, i32 0}; [DW_TAG_subroutine_type ]
920!5 = metadata !{null}
921!6 = metadata !{i32 458788, metadata !3, metadata !"int", metadata !3, i32 0,
922 i64 32, i64 32, i64 0, i32 0, i32 5}; [DW_TAG_base_type ]
923!7 = metadata !{i32 2, i32 7, metadata !1, null}
924!8 = metadata !{i32 2, i32 3, metadata !1, null}
925!9 = metadata !{i32 459008, metadata !1, metadata !"Y", metadata !3, i32 3,
926 metadata !6}; [ DW_TAG_auto_variable ]
927!10 = metadata !{i32 3, i32 7, metadata !1, null}
928!11 = metadata !{i32 3, i32 3, metadata !1, null}
929!12 = metadata !{i32 459008, metadata !13, metadata !"Z", metadata !3, i32 5,
930 metadata !6}; [ DW_TAG_auto_variable ]
931!13 = metadata !{i32 458763, metadata !1}; [DW_TAG_lexical_block ]
932!14 = metadata !{i32 5, i32 9, metadata !13, null}
933!15 = metadata !{i32 5, i32 5, metadata !13, null}
934!16 = metadata !{i32 6, i32 5, metadata !13, null}
935!17 = metadata !{i32 8, i32 3, metadata !1, null}
936!18 = metadata !{i32 9, i32 1, metadata !2, null}
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]937</pre>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]938</div>
939
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]940<p>This example illustrates a few important details about LLVM debugging
941 information. In particular, it shows how the <tt>llvm.dbg.declare</tt>
942 intrinsic and location information, which are attached to an instruction,
943 are applied together to allow a debugger to analyze the relationship between
944 statements, variable definitions, and the code used to implement the
945 function.</p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]946
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]947<div class="doc_code">
Bill Wendling02216ff2009-12-01 00:59:58 +0000[diff] [blame]948<pre>
Devang Patel37280782011-02-03 00:22:17 +0000[diff] [blame]949call void @llvm.dbg.declare(metadata, metadata !0), !dbg !7
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]950</pre>
951</div>
952
953<p>The first intrinsic
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]954 <tt>%<a href="#format_common_declare">llvm.dbg.declare</a></tt>
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]955 encodes debugging information for the variable <tt>X</tt>. The metadata
956 <tt>!dbg !7</tt> attached to the intrinsic provides scope information for the
957 variable <tt>X</tt>.</p>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]958
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]959<div class="doc_code">
960<pre>
961!7 = metadata !{i32 2, i32 7, metadata !1, null}
962!1 = metadata !{i32 458763, metadata !2}; [DW_TAG_lexical_block ]
963!2 = metadata !{i32 458798, i32 0, metadata !3, metadata !"foo",
964 metadata !"foo", metadata !"foo", metadata !3, i32 1,
965 metadata !4, i1 false, i1 true}; [DW_TAG_subprogram ]
966</pre>
967</div>
968
969<p>Here <tt>!7</tt> is metadata providing location information. It has four
970 fields: line number, column number, scope, and original scope. The original
971 scope represents inline location if this instruction is inlined inside a
972 caller, and is null otherwise. In this example, scope is encoded by
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]973 <tt>!1</tt>. <tt>!1</tt> represents a lexical block inside the scope
974 <tt>!2</tt>, where <tt>!2</tt> is a
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]975 <a href="#format_subprograms">subprogram descriptor</a>. This way the
976 location information attached to the intrinsics indicates that the
977 variable <tt>X</tt> is declared at line number 2 at a function level scope in
978 function <tt>foo</tt>.</p>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]979
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]980<p>Now lets take another example.</p>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]981
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]982<div class="doc_code">
Bill Wendling02216ff2009-12-01 00:59:58 +0000[diff] [blame]983<pre>
Devang Patel37280782011-02-03 00:22:17 +0000[diff] [blame]984call void @llvm.dbg.declare(metadata, metadata !12), !dbg !14
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]985</pre>
986</div>
987
988<p>The second intrinsic
Devang Patel744950d2009-11-25 23:28:01 +0000[diff] [blame]989 <tt>%<a href="#format_common_declare">llvm.dbg.declare</a></tt>
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]990 encodes debugging information for variable <tt>Z</tt>. The metadata
991 <tt>!dbg !14</tt> attached to the intrinsic provides scope information for
992 the variable <tt>Z</tt>.</p>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]993
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]994<div class="doc_code">
995<pre>
996!13 = metadata !{i32 458763, metadata !1}; [DW_TAG_lexical_block ]
997!14 = metadata !{i32 5, i32 9, metadata !13, null}
998</pre>
999</div>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1000
John Criswellb34500f2010-03-17 15:01:50 +0000[diff] [blame]1001<p>Here <tt>!14</tt> indicates that <tt>Z</tt> is declared at line number 5 and
Bill Wendlingcf493b82009-12-01 00:53:11 +0000[diff] [blame]1002 column number 9 inside of lexical scope <tt>!13</tt>. The lexical scope
1003 itself resides inside of lexical scope <tt>!1</tt> described above.</p>
1004
1005<p>The scope information attached with each instruction provides a
1006 straightforward way to find instructions covered by a scope.</p>
1007
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1008</div>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1009
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1010</div>
1011
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1012<!-- *********************************************************************** -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1013<h2>
Chris Lattner8ff75902004-01-06 05:31:32 +0000[diff] [blame]1014 <a name="ccxx_frontend">C/C++ front-end specific debug information</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1015</h2>
Misha Brukman94218a72004-12-09 20:27:37 +0000[diff] [blame]1016<!-- *********************************************************************** -->
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1017
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1018<div>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1019
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]1020<p>The C and C++ front-ends represent information about the program in a format
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1021 that is effectively identical
1022 to <a href="http://www.eagercon.com/dwarf/dwarf3std.htm">DWARF 3.0</a> in
1023 terms of information content. This allows code generators to trivially
1024 support native debuggers by generating standard dwarf information, and
1025 contains enough information for non-dwarf targets to translate it as
1026 needed.</p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1027
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1028<p>This section describes the forms used to represent C and C++ programs. Other
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1029 languages could pattern themselves after this (which itself is tuned to
1030 representing programs in the same way that DWARF 3 does), or they could
1031 choose to provide completely different forms if they don't fit into the DWARF
1032 model. As support for debugging information gets added to the various LLVM
1033 source-language front-ends, the information used should be documented
1034 here.</p>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1035
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1036<p>The following sections provide examples of various C/C++ constructs and the
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1037 debug information that would best describe those constructs.</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1038
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1039<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1040<h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1041 <a name="ccxx_compile_units">C/C++ source file information</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1042</h3>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1043
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1044<div>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1045
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1046<p>Given the source files <tt>MySource.cpp</tt> and <tt>MyHeader.h</tt> located
1047 in the directory <tt>/Users/mine/sources</tt>, the following code:</p>
Chris Lattner8ff75902004-01-06 05:31:32 +0000[diff] [blame]1048
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1049<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1050<pre>
1051#include "MyHeader.h"
Chris Lattner8ff75902004-01-06 05:31:32 +0000[diff] [blame]1052
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1053int main(int argc, char *argv[]) {
1054 return 0;
1055}
1056</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1057</div>
Chris Lattner8ff75902004-01-06 05:31:32 +0000[diff] [blame]1058
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]1059<p>a C/C++ front-end would generate the following descriptors:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1060
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1061<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1062<pre>
1063...
1064;;
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1065;; Define the compile unit for the main source file "/Users/mine/sources/MySource.cpp".
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1066;;
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1067!2 = metadata !{
1068 i32 524305, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1069 i32 0, ;; Unused
1070 i32 4, ;; Language Id
1071 metadata !"MySource.cpp",
1072 metadata !"/Users/mine/sources",
1073 metadata !"4.2.1 (Based on Apple Inc. build 5649) (LLVM build 00)",
1074 i1 true, ;; Main Compile Unit
1075 i1 false, ;; Optimized compile unit
1076 metadata !"", ;; Compiler flags
1077 i32 0} ;; Runtime version
1078
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1079;;
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1080;; Define the file for the file "/Users/mine/sources/MySource.cpp".
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1081;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1082!1 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1083 i32 524329, ;; Tag
1084 metadata !"MySource.cpp",
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1085 metadata !"/Users/mine/sources",
Devang Patel9fea9c22010-07-13 16:53:20 +0000[diff] [blame]1086 metadata !2 ;; Compile unit
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1087}
1088
1089;;
1090;; Define the file for the file "/Users/mine/sources/Myheader.h"
1091;;
1092!3 = metadata !{
1093 i32 524329, ;; Tag
1094 metadata !"Myheader.h"
1095 metadata !"/Users/mine/sources",
Devang Patel9fea9c22010-07-13 16:53:20 +0000[diff] [blame]1096 metadata !2 ;; Compile unit
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1097}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1098
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1099...
1100</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1101</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1102
Devang Pateld98ec5f2010-03-26 19:08:36 +0000[diff] [blame]1103<p>llvm::Instruction provides easy access to metadata attached with an
1104instruction. One can extract line number information encoded in LLVM IR
1105using <tt>Instruction::getMetadata()</tt> and
1106<tt>DILocation::getLineNumber()</tt>.
1107<pre>
1108 if (MDNode *N = I->getMetadata("dbg")) { // Here I is an LLVM instruction
1109 DILocation Loc(N); // DILocation is in DebugInfo.h
1110 unsigned Line = Loc.getLineNumber();
1111 StringRef File = Loc.getFilename();
1112 StringRef Dir = Loc.getDirectory();
1113 }
1114</pre>
Chris Lattner8ff75902004-01-06 05:31:32 +0000[diff] [blame]1115</div>
1116
1117<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1118<h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1119 <a name="ccxx_global_variable">C/C++ global variable information</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1120</h3>
Chris Lattner8ff75902004-01-06 05:31:32 +0000[diff] [blame]1121
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1122<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1123
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]1124<p>Given an integer global variable declared as follows:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1125
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1126<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1127<pre>
1128int MyGlobal = 100;
1129</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1130</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1131
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]1132<p>a C/C++ front-end would generate the following descriptors:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1133
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1134<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1135<pre>
1136;;
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1137;; Define the global itself.
1138;;
1139%MyGlobal = global int 100
1140...
1141;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1142;; List of debug info of globals
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1143;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1144!llvm.dbg.gv = !{!0}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1145
1146;;
1147;; Define the global variable descriptor. Note the reference to the global
1148;; variable anchor and the global variable itself.
1149;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1150!0 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1151 i32 524340, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1152 i32 0, ;; Unused
1153 metadata !1, ;; Context
1154 metadata !"MyGlobal", ;; Name
1155 metadata !"MyGlobal", ;; Display Name
1156 metadata !"MyGlobal", ;; Linkage Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1157 metadata !3, ;; Compile Unit
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1158 i32 1, ;; Line Number
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1159 metadata !4, ;; Type
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1160 i1 false, ;; Is a local variable
1161 i1 true, ;; Is this a definition
1162 i32* @MyGlobal ;; The global variable
1163}
1164
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1165;;
1166;; Define the basic type of 32 bit signed integer. Note that since int is an
1167;; intrinsic type the source file is NULL and line 0.
1168;;
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1169!4 = metadata !{
1170 i32 524324, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1171 metadata !1, ;; Context
1172 metadata !"int", ;; Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1173 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1174 i32 0, ;; Line number
1175 i64 32, ;; Size in Bits
1176 i64 32, ;; Align in Bits
1177 i64 0, ;; Offset in Bits
1178 i32 0, ;; Flags
1179 i32 5 ;; Encoding
1180}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1181
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1182</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1183</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1184
Chris Lattner8ff75902004-01-06 05:31:32 +0000[diff] [blame]1185</div>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1186
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1187<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1188<h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1189 <a name="ccxx_subprogram">C/C++ function information</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1190</h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1191
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1192<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1193
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]1194<p>Given a function declared as follows:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1195
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1196<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1197<pre>
1198int main(int argc, char *argv[]) {
1199 return 0;
1200}
1201</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1202</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1203
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]1204<p>a C/C++ front-end would generate the following descriptors:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1205
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1206<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1207<pre>
1208;;
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1209;; Define the anchor for subprograms. Note that the second field of the
1210;; anchor is 46, which is the same as the tag for subprograms
1211;; (46 = DW_TAG_subprogram.)
1212;;
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1213!6 = metadata !{
1214 i32 524334, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1215 i32 0, ;; Unused
1216 metadata !1, ;; Context
1217 metadata !"main", ;; Name
1218 metadata !"main", ;; Display name
1219 metadata !"main", ;; Linkage name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1220 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1221 i32 1, ;; Line number
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1222 metadata !4, ;; Type
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1223 i1 false, ;; Is local
Devang Patelda194752011-04-05 22:52:06 +0000[diff] [blame]1224 i1 true, ;; Is definition
1225 i32 0, ;; Virtuality attribute, e.g. pure virtual function
1226 i32 0, ;; Index into virtual table for C++ methods
1227 i32 0, ;; Type that holds virtual table.
1228 i32 0, ;; Flags
1229 i1 false, ;; True if this function is optimized
1230 Function *, ;; Pointer to llvm::Function
1231 null ;; Function template parameters
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1232}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1233;;
1234;; Define the subprogram itself.
1235;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1236define i32 @main(i32 %argc, i8** %argv) {
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1237...
1238}
1239</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1240</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1241
1242</div>
1243
1244<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1245<h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1246 <a name="ccxx_basic_types">C/C++ basic types</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1247</h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1248
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1249<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1250
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]1251<p>The following are the basic type descriptors for C/C++ core types:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1252
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1253<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1254<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1255 <a name="ccxx_basic_type_bool">bool</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1256</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1257
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1258<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1259
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1260<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1261<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1262!2 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1263 i32 524324, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1264 metadata !1, ;; Context
1265 metadata !"bool", ;; Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1266 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1267 i32 0, ;; Line number
1268 i64 8, ;; Size in Bits
1269 i64 8, ;; Align in Bits
1270 i64 0, ;; Offset in Bits
1271 i32 0, ;; Flags
1272 i32 2 ;; Encoding
1273}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1274</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1275</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1276
1277</div>
1278
1279<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1280<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1281 <a name="ccxx_basic_char">char</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1282</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1283
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1284<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1285
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1286<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1287<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1288!2 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1289 i32 524324, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1290 metadata !1, ;; Context
1291 metadata !"char", ;; Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1292 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1293 i32 0, ;; Line number
1294 i64 8, ;; Size in Bits
1295 i64 8, ;; Align in Bits
1296 i64 0, ;; Offset in Bits
1297 i32 0, ;; Flags
1298 i32 6 ;; Encoding
1299}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1300</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1301</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1302
1303</div>
1304
1305<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1306<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1307 <a name="ccxx_basic_unsigned_char">unsigned char</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1308</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1309
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1310<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1311
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1312<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1313<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1314!2 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1315 i32 524324, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1316 metadata !1, ;; Context
1317 metadata !"unsigned char",
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1318 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1319 i32 0, ;; Line number
1320 i64 8, ;; Size in Bits
1321 i64 8, ;; Align in Bits
1322 i64 0, ;; Offset in Bits
1323 i32 0, ;; Flags
1324 i32 8 ;; Encoding
1325}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1326</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1327</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1328
1329</div>
1330
1331<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1332<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1333 <a name="ccxx_basic_short">short</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1334</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1335
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1336<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1337
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1338<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1339<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1340!2 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1341 i32 524324, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1342 metadata !1, ;; Context
1343 metadata !"short int",
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1344 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1345 i32 0, ;; Line number
1346 i64 16, ;; Size in Bits
1347 i64 16, ;; Align in Bits
1348 i64 0, ;; Offset in Bits
1349 i32 0, ;; Flags
1350 i32 5 ;; Encoding
1351}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1352</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1353</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1354
1355</div>
1356
1357<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1358<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1359 <a name="ccxx_basic_unsigned_short">unsigned short</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1360</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1361
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1362<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1363
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1364<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1365<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1366!2 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1367 i32 524324, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1368 metadata !1, ;; Context
1369 metadata !"short unsigned int",
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1370 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1371 i32 0, ;; Line number
1372 i64 16, ;; Size in Bits
1373 i64 16, ;; Align in Bits
1374 i64 0, ;; Offset in Bits
1375 i32 0, ;; Flags
1376 i32 7 ;; Encoding
1377}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1378</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1379</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1380
1381</div>
1382
1383<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1384<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1385 <a name="ccxx_basic_int">int</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1386</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1387
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1388<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1389
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1390<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1391<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1392!2 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1393 i32 524324, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1394 metadata !1, ;; Context
1395 metadata !"int", ;; Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1396 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1397 i32 0, ;; Line number
1398 i64 32, ;; Size in Bits
1399 i64 32, ;; Align in Bits
1400 i64 0, ;; Offset in Bits
1401 i32 0, ;; Flags
1402 i32 5 ;; Encoding
1403}
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1404</pre></div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1405
1406</div>
1407
1408<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1409<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1410 <a name="ccxx_basic_unsigned_int">unsigned int</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1411</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1412
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1413<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1414
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1415<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1416<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1417!2 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1418 i32 524324, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1419 metadata !1, ;; Context
1420 metadata !"unsigned int",
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1421 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1422 i32 0, ;; Line number
1423 i64 32, ;; Size in Bits
1424 i64 32, ;; Align in Bits
1425 i64 0, ;; Offset in Bits
1426 i32 0, ;; Flags
1427 i32 7 ;; Encoding
1428}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1429</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1430</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1431
1432</div>
1433
1434<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1435<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1436 <a name="ccxx_basic_long_long">long long</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1437</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1438
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1439<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1440
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1441<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1442<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1443!2 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1444 i32 524324, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1445 metadata !1, ;; Context
1446 metadata !"long long int",
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1447 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1448 i32 0, ;; Line number
1449 i64 64, ;; Size in Bits
1450 i64 64, ;; Align in Bits
1451 i64 0, ;; Offset in Bits
1452 i32 0, ;; Flags
1453 i32 5 ;; Encoding
1454}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1455</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1456</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1457
1458</div>
1459
1460<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1461<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1462 <a name="ccxx_basic_unsigned_long_long">unsigned long long</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1463</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1464
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1465<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1466
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1467<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1468<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1469!2 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1470 i32 524324, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1471 metadata !1, ;; Context
1472 metadata !"long long unsigned int",
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1473 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1474 i32 0, ;; Line number
1475 i64 64, ;; Size in Bits
1476 i64 64, ;; Align in Bits
1477 i64 0, ;; Offset in Bits
1478 i32 0, ;; Flags
1479 i32 7 ;; Encoding
1480}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1481</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1482</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1483
1484</div>
1485
1486<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1487<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1488 <a name="ccxx_basic_float">float</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1489</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1490
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1491<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1492
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1493<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1494<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1495!2 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1496 i32 524324, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1497 metadata !1, ;; Context
1498 metadata !"float",
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1499 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1500 i32 0, ;; Line number
1501 i64 32, ;; Size in Bits
1502 i64 32, ;; Align in Bits
1503 i64 0, ;; Offset in Bits
1504 i32 0, ;; Flags
1505 i32 4 ;; Encoding
1506}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1507</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1508</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1509
1510</div>
1511
1512<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1513<h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1514 <a name="ccxx_basic_double">double</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1515</h4>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1516
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1517<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1518
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1519<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1520<pre>
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1521!2 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1522 i32 524324, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1523 metadata !1, ;; Context
1524 metadata !"double",;; Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1525 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1526 i32 0, ;; Line number
1527 i64 64, ;; Size in Bits
1528 i64 64, ;; Align in Bits
1529 i64 0, ;; Offset in Bits
1530 i32 0, ;; Flags
1531 i32 4 ;; Encoding
1532}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1533</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1534</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1535
1536</div>
1537
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1538</div>
1539
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1540<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1541<h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1542 <a name="ccxx_derived_types">C/C++ derived types</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1543</h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1544
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1545<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1546
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]1547<p>Given the following as an example of C/C++ derived type:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1548
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1549<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1550<pre>
1551typedef const int *IntPtr;
1552</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1553</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1554
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]1555<p>a C/C++ front-end would generate the following descriptors:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1556
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1557<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1558<pre>
1559;;
1560;; Define the typedef "IntPtr".
1561;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1562!2 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1563 i32 524310, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1564 metadata !1, ;; Context
1565 metadata !"IntPtr", ;; Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1566 metadata !3, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1567 i32 0, ;; Line number
1568 i64 0, ;; Size in bits
1569 i64 0, ;; Align in bits
1570 i64 0, ;; Offset in bits
1571 i32 0, ;; Flags
1572 metadata !4 ;; Derived From type
1573}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1574
1575;;
1576;; Define the pointer type.
1577;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1578!4 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1579 i32 524303, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1580 metadata !1, ;; Context
1581 metadata !"", ;; Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1582 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1583 i32 0, ;; Line number
1584 i64 64, ;; Size in bits
1585 i64 64, ;; Align in bits
1586 i64 0, ;; Offset in bits
1587 i32 0, ;; Flags
1588 metadata !5 ;; Derived From type
1589}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1590;;
1591;; Define the const type.
1592;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1593!5 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1594 i32 524326, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1595 metadata !1, ;; Context
1596 metadata !"", ;; Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1597 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1598 i32 0, ;; Line number
1599 i64 32, ;; Size in bits
1600 i64 32, ;; Align in bits
1601 i64 0, ;; Offset in bits
1602 i32 0, ;; Flags
1603 metadata !6 ;; Derived From type
1604}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1605;;
1606;; Define the int type.
1607;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1608!6 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1609 i32 524324, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1610 metadata !1, ;; Context
1611 metadata !"int", ;; Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1612 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1613 i32 0, ;; Line number
1614 i64 32, ;; Size in bits
1615 i64 32, ;; Align in bits
1616 i64 0, ;; Offset in bits
1617 i32 0, ;; Flags
1618 5 ;; Encoding
1619}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1620</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1621</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1622
1623</div>
1624
1625<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1626<h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1627 <a name="ccxx_composite_types">C/C++ struct/union types</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1628</h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1629
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1630<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1631
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]1632<p>Given the following as an example of C/C++ struct type:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1633
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1634<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1635<pre>
1636struct Color {
1637 unsigned Red;
1638 unsigned Green;
1639 unsigned Blue;
1640};
1641</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1642</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1643
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]1644<p>a C/C++ front-end would generate the following descriptors:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1645
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1646<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1647<pre>
1648;;
1649;; Define basic type for unsigned int.
1650;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1651!5 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1652 i32 524324, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1653 metadata !1, ;; Context
1654 metadata !"unsigned int",
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1655 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1656 i32 0, ;; Line number
1657 i64 32, ;; Size in Bits
1658 i64 32, ;; Align in Bits
1659 i64 0, ;; Offset in Bits
1660 i32 0, ;; Flags
1661 i32 7 ;; Encoding
1662}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1663;;
1664;; Define composite type for struct Color.
1665;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1666!2 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1667 i32 524307, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1668 metadata !1, ;; Context
1669 metadata !"Color", ;; Name
1670 metadata !1, ;; Compile unit
1671 i32 1, ;; Line number
1672 i64 96, ;; Size in bits
1673 i64 32, ;; Align in bits
1674 i64 0, ;; Offset in bits
1675 i32 0, ;; Flags
1676 null, ;; Derived From
1677 metadata !3, ;; Elements
1678 i32 0 ;; Runtime Language
1679}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1680
1681;;
1682;; Define the Red field.
1683;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1684!4 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1685 i32 524301, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1686 metadata !1, ;; Context
1687 metadata !"Red", ;; Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1688 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1689 i32 2, ;; Line number
1690 i64 32, ;; Size in bits
1691 i64 32, ;; Align in bits
1692 i64 0, ;; Offset in bits
1693 i32 0, ;; Flags
1694 metadata !5 ;; Derived From type
1695}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1696
1697;;
1698;; Define the Green field.
1699;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1700!6 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1701 i32 524301, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1702 metadata !1, ;; Context
1703 metadata !"Green", ;; Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1704 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1705 i32 3, ;; Line number
1706 i64 32, ;; Size in bits
1707 i64 32, ;; Align in bits
1708 i64 32, ;; Offset in bits
1709 i32 0, ;; Flags
1710 metadata !5 ;; Derived From type
1711}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1712
1713;;
1714;; Define the Blue field.
1715;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1716!7 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1717 i32 524301, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1718 metadata !1, ;; Context
1719 metadata !"Blue", ;; Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1720 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1721 i32 4, ;; Line number
1722 i64 32, ;; Size in bits
1723 i64 32, ;; Align in bits
1724 i64 64, ;; Offset in bits
1725 i32 0, ;; Flags
1726 metadata !5 ;; Derived From type
1727}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1728
1729;;
1730;; Define the array of fields used by the composite type Color.
1731;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1732!3 = metadata !{metadata !4, metadata !6, metadata !7}
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1733</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1734</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1735
1736</div>
1737
1738<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1739<h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1740 <a name="ccxx_enumeration_types">C/C++ enumeration types</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]1741</h3>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1742
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1743<div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1744
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]1745<p>Given the following as an example of C/C++ enumeration type:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1746
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1747<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1748<pre>
1749enum Trees {
1750 Spruce = 100,
1751 Oak = 200,
1752 Maple = 300
1753};
1754</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1755</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1756
Misha Brukman96e00812008-12-16 02:54:22 +0000[diff] [blame]1757<p>a C/C++ front-end would generate the following descriptors:</p>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1758
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1759<div class="doc_code">
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1760<pre>
1761;;
1762;; Define composite type for enum Trees
1763;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1764!2 = metadata !{
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1765 i32 524292, ;; Tag
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1766 metadata !1, ;; Context
1767 metadata !"Trees", ;; Name
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1768 metadata !1, ;; File
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1769 i32 1, ;; Line number
1770 i64 32, ;; Size in bits
1771 i64 32, ;; Align in bits
1772 i64 0, ;; Offset in bits
1773 i32 0, ;; Flags
1774 null, ;; Derived From type
1775 metadata !3, ;; Elements
1776 i32 0 ;; Runtime language
1777}
Devang Patel2a610c72009-08-25 05:24:07 +0000[diff] [blame]1778
Devang Patel82459882009-08-26 05:01:18 +0000[diff] [blame]1779;;
1780;; Define the array of enumerators used by composite type Trees.
1781;;
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1782!3 = metadata !{metadata !4, metadata !5, metadata !6}
1783
1784;;
1785;; Define Spruce enumerator.
1786;;
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1787!4 = metadata !{i32 524328, metadata !"Spruce", i64 100}
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1788
1789;;
1790;; Define Oak enumerator.
1791;;
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1792!5 = metadata !{i32 524328, metadata !"Oak", i64 200}
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1793
1794;;
1795;; Define Maple enumerator.
1796;;
Devang Patel4b945502010-03-09 00:44:10 +0000[diff] [blame]1797!6 = metadata !{i32 524328, metadata !"Maple", i64 300}
Devang Patele4b27562009-08-28 23:24:31 +0000[diff] [blame]1798
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1799</pre>
Bill Wendling48839d92009-05-17 05:52:39 +0000[diff] [blame]1800</div>
Jim Laskeycec12a52006-03-14 18:08:46 +0000[diff] [blame]1801
1802</div>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1803
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]1804</div>
1805
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1806<!-- *********************************************************************** -->
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]1807
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1808<hr>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]1809<address>
1810 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]1811 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]1812 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]1813 src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]1814
1815 <a href="mailto:sabre@nondot.org">Chris Lattner</a><br>
NAKAMURA Takumib9a33632011-04-09 02:13:37 +0000[diff] [blame]1816 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1817 Last modified: $Date$
Misha Brukman82873732004-05-12 19:21:57 +0000[diff] [blame]1818</address>
Chris Lattnerbdfb3392004-01-05 05:06:33 +0000[diff] [blame]1819
1820</body>
1821</html>