src/gallium/auxiliary/gallivm/lp_bld_misc.cpp

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   3  * Copyright 2010 VMware, Inc.
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  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 #if (defined(PIPE_OS_WINDOWS) && !defined(PIPE_CC_MSVC)) || defined(PIPE_OS_EMBDDED)
  50
  51 #include "llvm/Support/raw_ostream.h"
  52
  53 class raw_debug_ostream :
  54    public llvm::raw_ostream
  55 {
  56    uint64_t pos;
  57
  58    void write_impl(const char *Ptr, size_t Size);
  59    uint64_t current_pos() { return pos; }
  60    uint64_t current_pos() const { return pos; }
  61
  62 #if HAVE_LLVM >= 0x207
  63    uint64_t preferred_buffer_size() { return 512; }
  64 #else
  65    size_t preferred_buffer_size() { return 512; }
  66 #endif
  67 };
  68
  69
  70 void
  71 raw_debug_ostream::write_impl(const char *Ptr, size_t Size)
  72 {
  73    if (Size > 0) {
  74       char *lastPtr = (char *)&Ptr[Size];
  75       char last = *lastPtr;
  76       *lastPtr = 0;
  77       _debug_printf("%*s", Size, Ptr);
  78       *lastPtr = last;
  79       pos += Size;
  80    }
  81 }
  82
  83
  84 /**
  85  * Same as LLVMDumpValue, but through our debugging channels.
  86  */
  87 extern "C" void
  88 lp_debug_dump_value(LLVMValueRef value)
  89 {
  90    raw_debug_ostream os;
  91    llvm::unwrap(value)->print(os);
  92    os.flush();
  93 }
  94
  95
  96 #else
  97
  98
  99 extern "C" void
 100 lp_debug_dump_value(LLVMValueRef value)
 101 {
 102    LLVMDumpValue(value);
 103 }
 104
 105
 106 #endif
 107
 108
 109 /**
 110  * Register the engine with oprofile.
 111  *
 112  * This allows to see the LLVM IR function names in oprofile output.
 113  *
 114  * To actually work LLVM needs to be built with the --with-oprofile configure
 115  * option.
 116  *
 117  * Also a oprofile:oprofile user:group is necessary. Which is not created by
 118  * default on some distributions.
 119  */
 120 extern "C" void
 121 lp_register_oprofile_jit_event_listener(LLVMExecutionEngineRef EE)
 122 {
 123    llvm::unwrap(EE)->RegisterJITEventListener(llvm::createOProfileJITEventListener());
 124 }
 125
 126
 127 extern "C" void
 128 lp_set_target_options(void)
 129 {
 130 #if defined(DEBUG)
 131 #if HAVE_LLVM >= 0x0207
 132    llvm::JITEmitDebugInfo = true;
 133 #endif
 134 #endif
 135
 136 #if defined(DEBUG) || defined(PROFILE)
 137    llvm::NoFramePointerElim = true;
 138 #endif
 139
 140    llvm::NoExcessFPPrecision = false;
 141
 142    /* XXX: Investigate this */
 143 #if 0
 144    llvm::UnsafeFPMath = true;
 145 #endif
 146
 147    /*
 148     * LLVM will generate MMX instructions for vectors <= 64 bits, leading to
 149     * innefficient code, and in 32bit systems, to the corruption of the FPU
 150     * stack given that it expects the user to generate the EMMS instructions.
 151     *
 152     * See also:
 153     * - http://llvm.org/bugs/show_bug.cgi?id=3287
 154     * - http://l4.me.uk/post/2009/06/07/llvm-wrinkle-3-configuration-what-configuration/
 155     */
 156    static boolean first = TRUE;
 157    if (first) {
 158       static const char* options[] = {
 159          "prog",
 160          "-disable-mmx"
 161       };
 162       llvm::cl::ParseCommandLineOptions(2, const_cast<char**>(options));
 163       first = FALSE;
 164    }
 165
 166    /*
 167     * By default LLVM adds a signal handler to output a pretty stack trace.
 168     * This signal handler is never removed, causing problems when unloading the
 169     * shared object where the gallium driver resides.
 170     */
 171    llvm::DisablePrettyStackTrace = true;
 172 }
 173
 174
 175 extern "C" void
 176 lp_func_delete_body(LLVMValueRef FF)
 177 {
 178    llvm::Function *func = llvm::unwrap<llvm::Function>(FF);
 179    func->deleteBody();
 180 }
 181
 182
 183 extern "C"
 184 LLVMValueRef
 185 lp_build_load_volatile(LLVMBuilderRef B, LLVMValueRef PointerVal,
 186                        const char *Name)
 187 {
 188    return llvm::wrap(llvm::unwrap(B)->CreateLoad(llvm::unwrap(PointerVal), true, Name));
 189 }
 190