/**************************************************************************
 *
 * Copyright 2010 VMware, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 **************************************************************************/


#ifndef __STDC_LIMIT_MACROS
#define __STDC_LIMIT_MACROS
#endif

#ifndef __STDC_CONSTANT_MACROS
#define __STDC_CONSTANT_MACROS
#endif

#include <llvm-c/Core.h>
#include <llvm-c/ExecutionEngine.h>
#include <llvm/Target/TargetOptions.h>
#include <llvm/ExecutionEngine/ExecutionEngine.h>
#include <llvm/ExecutionEngine/JITEventListener.h>
#include <llvm/Support/CommandLine.h>
#include <llvm/Support/PrettyStackTrace.h>

#include "pipe/p_config.h"
#include "util/u_debug.h"


#if (defined(PIPE_OS_WINDOWS) && !defined(PIPE_CC_MSVC)) || defined(PIPE_OS_EMBDDED)

#include "llvm/Support/raw_ostream.h"

class raw_debug_ostream :
   public llvm::raw_ostream
{
   uint64_t pos;

   void write_impl(const char *Ptr, size_t Size);
   uint64_t current_pos() { return pos; }
   uint64_t current_pos() const { return pos; }

#if HAVE_LLVM >= 0x207
   uint64_t preferred_buffer_size() { return 512; }
#else
   size_t preferred_buffer_size() { return 512; }
#endif
};


void
raw_debug_ostream::write_impl(const char *Ptr, size_t Size)
{
   if (Size > 0) {
      char *lastPtr = (char *)&Ptr[Size];
      char last = *lastPtr;
      *lastPtr = 0;
      _debug_printf("%*s", Size, Ptr);
      *lastPtr = last;
      pos += Size;
   }
}


/**
 * Same as LLVMDumpValue, but through our debugging channels.
 */
extern "C" void
lp_debug_dump_value(LLVMValueRef value)
{
   raw_debug_ostream os;
   llvm::unwrap(value)->print(os);
   os.flush();
}


#else


extern "C" void
lp_debug_dump_value(LLVMValueRef value)
{
   LLVMDumpValue(value);
}


#endif


/**
 * Register the engine with oprofile.
 *
 * This allows to see the LLVM IR function names in oprofile output.
 *
 * To actually work LLVM needs to be built with the --with-oprofile configure
 * option.
 *
 * Also a oprofile:oprofile user:group is necessary. Which is not created by
 * default on some distributions.
 */
extern "C" void
lp_register_oprofile_jit_event_listener(LLVMExecutionEngineRef EE)
{
   llvm::unwrap(EE)->RegisterJITEventListener(llvm::createOProfileJITEventListener());
}


extern "C" void
lp_set_target_options(void)
{
#if defined(DEBUG)
#if HAVE_LLVM >= 0x0207
   llvm::JITEmitDebugInfo = true;
#endif
#endif

#if defined(DEBUG) || defined(PROFILE)
   llvm::NoFramePointerElim = true;
#endif

   llvm::NoExcessFPPrecision = false;

   /* XXX: Investigate this */
#if 0
   llvm::UnsafeFPMath = true;
#endif

   /*
    * LLVM will generate MMX instructions for vectors <= 64 bits, leading to
    * innefficient code, and in 32bit systems, to the corruption of the FPU
    * stack given that it expects the user to generate the EMMS instructions.
    *
    * See also:
    * - http://llvm.org/bugs/show_bug.cgi?id=3287
    * - http://l4.me.uk/post/2009/06/07/llvm-wrinkle-3-configuration-what-configuration/
    */
   static boolean first = TRUE;
   if (first) {
      static const char* options[] = {
         "prog",
         "-disable-mmx"
      };
      llvm::cl::ParseCommandLineOptions(2, const_cast<char**>(options));
      first = FALSE;
   }

   /*
    * By default LLVM adds a signal handler to output a pretty stack trace.
    * This signal handler is never removed, causing problems when unloading the
    * shared object where the gallium driver resides.
    */
   llvm::DisablePrettyStackTrace = true;
}


extern "C" void
lp_func_delete_body(LLVMValueRef FF)
{
   llvm::Function *func = llvm::unwrap<llvm::Function>(FF);
   func->deleteBody();
}