lp_bld_misc.cpp revision 61c67eca7dbcef4b7b1398f5a9e0193597f304ed 
1/**************************************************************************
2 *
3 * Copyright 2010 VMware, Inc.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
18 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
19 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
20 * USE OR OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * The above copyright notice and this permission notice (including the
23 * next paragraph) shall be included in all copies or substantial portions
24 * of the Software.
25 *
26 **************************************************************************/
27
28
29#ifndef __STDC_LIMIT_MACROS
30#define __STDC_LIMIT_MACROS
31#endif
32
33#ifndef __STDC_CONSTANT_MACROS
34#define __STDC_CONSTANT_MACROS
35#endif
36
37#include <llvm-c/Core.h>
38#include <llvm-c/ExecutionEngine.h>
39#include <llvm/Target/TargetOptions.h>
40#include <llvm/ExecutionEngine/ExecutionEngine.h>
41#include <llvm/ExecutionEngine/JITEventListener.h>
42#include <llvm/Support/CommandLine.h>
43#include <llvm/Support/PrettyStackTrace.h>
44
45#include "pipe/p_config.h"
46#include "util/u_debug.h"
47
48
49/**
50 * Register the engine with oprofile.
51 *
52 * This allows to see the LLVM IR function names in oprofile output.
53 *
54 * To actually work LLVM needs to be built with the --with-oprofile configure
55 * option.
56 *
57 * Also a oprofile:oprofile user:group is necessary. Which is not created by
58 * default on some distributions.
59 */
60extern "C" void
61lp_register_oprofile_jit_event_listener(LLVMExecutionEngineRef EE)
62{
63   llvm::unwrap(EE)->RegisterJITEventListener(llvm::createOProfileJITEventListener());
64}
65
66
67extern "C" void
68lp_set_target_options(void)
69{
70#if defined(DEBUG)
71#if HAVE_LLVM >= 0x0207
72   llvm::JITEmitDebugInfo = true;
73#endif
74#endif
75
76   /*
77    * LLVM revision 123367 switched the default stack alignment to 16 bytes on
78    * Linux (and several other Unices in later revisions), to match recent gcc
79    * versions.
80    *
81    * However our drivers can be loaded by old binary applications, still
82    * maintaining a 4 bytes stack alignment.  Therefore we must tell LLVM here
83    * to only assume a 4 bytes alignment for backwards compatibility.
84    */
85#if defined(PIPE_ARCH_X86)
86   llvm::StackAlignment = 4;
87#endif
88
89#if defined(DEBUG) || defined(PROFILE)
90   llvm::NoFramePointerElim = true;
91#endif
92
93   llvm::NoExcessFPPrecision = false;
94
95   /* XXX: Investigate this */
96#if 0
97   llvm::UnsafeFPMath = true;
98#endif
99
100#if HAVE_LLVM < 0x0209
101   /*
102    * LLVM will generate MMX instructions for vectors <= 64 bits, leading to
103    * innefficient code, and in 32bit systems, to the corruption of the FPU
104    * stack given that it expects the user to generate the EMMS instructions.
105    *
106    * See also:
107    * - http://llvm.org/bugs/show_bug.cgi?id=3287
108    * - http://l4.me.uk/post/2009/06/07/llvm-wrinkle-3-configuration-what-configuration/
109    */
110   static boolean first = TRUE;
111   if (first) {
112      static const char* options[] = {
113         "prog",
114         "-disable-mmx"
115      };
116      llvm::cl::ParseCommandLineOptions(2, const_cast<char**>(options));
117      first = FALSE;
118   }
119#endif
120
121   /*
122    * By default LLVM adds a signal handler to output a pretty stack trace.
123    * This signal handler is never removed, causing problems when unloading the
124    * shared object where the gallium driver resides.
125    */
126   llvm::DisablePrettyStackTrace = true;
127}
128
129
130extern "C" void
131lp_func_delete_body(LLVMValueRef FF)
132{
133   llvm::Function *func = llvm::unwrap<llvm::Function>(FF);
134   func->deleteBody();
135}
136
137
138extern "C"
139LLVMValueRef
140lp_build_load_volatile(LLVMBuilderRef B, LLVMValueRef PointerVal,
141                       const char *Name)
142{
143   return llvm::wrap(llvm::unwrap(B)->CreateLoad(llvm::unwrap(PointerVal), true, Name));
144}
145
146