lp_bld_misc.cpp revision 95aa0e5d84a4f46f2f0809b26f5899b8e39f5afc 
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 <stddef.h>
38
39#include <llvm-c/Core.h>
40#include <llvm-c/ExecutionEngine.h>
41#include <llvm/Target/TargetOptions.h>
42#include <llvm/ExecutionEngine/ExecutionEngine.h>
43#include <llvm/ExecutionEngine/JITEventListener.h>
44#include <llvm/Support/CommandLine.h>
45#include <llvm/Support/PrettyStackTrace.h>
46
47#include "pipe/p_config.h"
48#include "util/u_debug.h"
49
50
51/**
52 * Register the engine with oprofile.
53 *
54 * This allows to see the LLVM IR function names in oprofile output.
55 *
56 * To actually work LLVM needs to be built with the --with-oprofile configure
57 * option.
58 *
59 * Also a oprofile:oprofile user:group is necessary. Which is not created by
60 * default on some distributions.
61 */
62extern "C" void
63lp_register_oprofile_jit_event_listener(LLVMExecutionEngineRef EE)
64{
65   llvm::unwrap(EE)->RegisterJITEventListener(llvm::createOProfileJITEventListener());
66}
67
68
69extern "C" void
70lp_set_target_options(void)
71{
72#if HAVE_LLVM <= 0x0300
73#if defined(DEBUG)
74#if HAVE_LLVM >= 0x0207
75   llvm::JITEmitDebugInfo = true;
76#endif
77#endif
78
79   /*
80    * LLVM revision 123367 switched the default stack alignment to 16 bytes on
81    * Linux (and several other Unices in later revisions), to match recent gcc
82    * versions.
83    *
84    * However our drivers can be loaded by old binary applications, still
85    * maintaining a 4 bytes stack alignment.  Therefore we must tell LLVM here
86    * to only assume a 4 bytes alignment for backwards compatibility.
87    */
88#if defined(PIPE_ARCH_X86)
89#if HAVE_LLVM >= 0x0300
90   llvm::StackAlignmentOverride = 4;
91#else
92   llvm::StackAlignment = 4;
93#endif
94#endif
95
96#if defined(DEBUG) || defined(PROFILE)
97   llvm::NoFramePointerElim = true;
98#endif
99
100   llvm::NoExcessFPPrecision = false;
101
102   /* XXX: Investigate this */
103#if 0
104   llvm::UnsafeFPMath = true;
105#endif
106#endif  /* HAVE_LLVM <= 0x0300 */
107
108#if HAVE_LLVM < 0x0209
109   /*
110    * LLVM will generate MMX instructions for vectors <= 64 bits, leading to
111    * innefficient code, and in 32bit systems, to the corruption of the FPU
112    * stack given that it expects the user to generate the EMMS instructions.
113    *
114    * See also:
115    * - http://llvm.org/bugs/show_bug.cgi?id=3287
116    * - http://l4.me.uk/post/2009/06/07/llvm-wrinkle-3-configuration-what-configuration/
117    *
118    * The -disable-mmx global option can be specified only once  since we
119    * dynamically link against LLVM it will reside in a separate shared object,
120    * which may or not be delete when this shared object is, so we use the
121    * llvm::DisablePrettyStackTrace variable (which we set below and should
122    * reside in the same shared library) to determine whether the -disable-mmx
123    * option has been set or not.
124    *
125    * Thankfully this ugly hack is not necessary on LLVM 2.9 onwards.
126    */
127   if (!llvm::DisablePrettyStackTrace) {
128      static boolean first = TRUE;
129      static const char* options[] = {
130         "prog",
131         "-disable-mmx"
132      };
133      assert(first);
134      llvm::cl::ParseCommandLineOptions(2, const_cast<char**>(options));
135      first = FALSE;
136   }
137#endif
138
139   /*
140    * By default LLVM adds a signal handler to output a pretty stack trace.
141    * This signal handler is never removed, causing problems when unloading the
142    * shared object where the gallium driver resides.
143    */
144   llvm::DisablePrettyStackTrace = true;
145}
146
147
148extern "C" void
149lp_func_delete_body(LLVMValueRef FF)
150{
151   llvm::Function *func = llvm::unwrap<llvm::Function>(FF);
152   func->deleteBody();
153}
154
155
156extern "C"
157LLVMValueRef
158lp_build_load_volatile(LLVMBuilderRef B, LLVMValueRef PointerVal,
159                       const char *Name)
160{
161   return llvm::wrap(llvm::unwrap(B)->CreateLoad(llvm::unwrap(PointerVal), true, Name));
162}
163
164