lp_bld_assert.c

/**************************************************************************
 *
 * 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
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 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * 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 VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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#include "util/u_debug.h"
#include "util/u_memory.h"
#include "lp_bld_assert.h"
#include "lp_bld_init.h"
#include "lp_bld_const.h"
#include "lp_bld_printf.h"


/**
 * A call to lp_build_assert() will build a function call to this function.
 */
static void
lp_assert(int condition, const char *msg)
{
   if (!condition) {
      debug_printf("LLVM assertion '%s' failed!\n", msg);
      assert(condition);
   }
}



/**
 * lp_build_assert.
 *
 * Build an assertion in LLVM IR by building a function call to the
 * lp_assert() function above.
 *
 * \param condition should be an 'i1' or 'i32' value
 * \param msg  a string to print if the assertion fails.
 */
void
lp_build_assert(struct gallivm_state *gallivm,
                LLVMValueRef condition,
                const char *msg)
{
   LLVMBuilderRef builder = gallivm->builder;
   LLVMContextRef context = gallivm->context;
   LLVMTypeRef arg_types[2];
   LLVMTypeRef ret_type;
   LLVMValueRef function;
   LLVMValueRef args[2];
   LLVMValueRef msg_string;

   msg_string = lp_build_const_string(gallivm, msg);

   ret_type = LLVMVoidTypeInContext(context);
   arg_types[0] = LLVMInt32TypeInContext(context);
   arg_types[1] = LLVMPointerType(LLVMInt8TypeInContext(context), 0);

   function = lp_build_const_func_pointer(gallivm,
                                          func_to_pointer((func_pointer)lp_assert),
                                          ret_type, arg_types, ARRAY_SIZE(arg_types),
                                          "assert");

   /* build function call param list */
   args[0] = LLVMBuildZExt(builder, condition, arg_types[0], "");
   args[1] = msg_string;

   /* check arg types */
   assert(LLVMTypeOf(args[0]) == arg_types[0]);
   assert(LLVMTypeOf(args[1]) == arg_types[1]);

   LLVMBuildCall(builder, function, args, ARRAY_SIZE(args), "");
}