src/gallium/auxiliary/gallivm/lp_bld_assert.c

   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 above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "util/u_debug.h"
  29 #include "util/u_memory.h"
  30 #include "lp_bld_assert.h"
  31 #include "lp_bld_init.h"
  32 #include "lp_bld_printf.h"
  33
  34
  35 /**
  36  * A call to lp_build_assert() will build a function call to this function.
  37  */
  38 static void
  39 lp_assert(int condition, const char *msg)
  40 {
  41    if (!condition) {
  42       debug_printf("LLVM assertion '%s' failed!\n", msg);
  43       assert(condition);
  44    }
  45 }
  46
  47
  48
  49 /**
  50  * lp_build_assert.
  51  *
  52  * Build an assertion in LLVM IR by building a function call to the
  53  * lp_assert() function above.
  54  *
  55  * \param condition should be an 'i1' or 'i32' value
  56  * \param msg  a string to print if the assertion fails.
  57  */
  58 LLVMValueRef
  59 lp_build_assert(LLVMBuilderRef builder, LLVMValueRef condition,
  60                 const char *msg)
  61 {
  62    LLVMModuleRef module;
  63    LLVMTypeRef arg_types[2];
  64    LLVMValueRef msg_string, assert_func, params[2], r;
  65
  66    module = LLVMGetGlobalParent(LLVMGetBasicBlockParent(
  67                             LLVMGetInsertBlock(builder)));
  68
  69    msg_string = lp_build_const_string_variable(module, msg, strlen(msg) + 1);
  70
  71    arg_types[0] = LLVMInt32Type();
  72    arg_types[1] = LLVMPointerType(LLVMInt8Type(), 0);
  73
  74    /* lookup the lp_assert function */
  75    assert_func = LLVMGetNamedFunction(module, "lp_assert");
  76
  77    /* Create the assertion function if not found */
  78    if (!assert_func) {
  79       LLVMTypeRef func_type =
  80          LLVMFunctionType(LLVMVoidType(), arg_types, 2, 0);
  81
  82       assert_func = LLVMAddFunction(module, "lp_assert", func_type);
  83       LLVMSetFunctionCallConv(assert_func, LLVMCCallConv);
  84       LLVMSetLinkage(assert_func, LLVMExternalLinkage);
  85       LLVMAddGlobalMapping(lp_build_engine, assert_func,
  86                            func_to_pointer((func_pointer)lp_assert));
  87    }
  88    assert(assert_func);
  89
  90    /* build function call param list */
  91    params[0] = LLVMBuildZExt(builder, condition, arg_types[0], "");
  92    params[1] = LLVMBuildBitCast(builder, msg_string, arg_types[1], "");
  93
  94    /* check arg types */
  95    assert(LLVMTypeOf(params[0]) == arg_types[0]);
  96    assert(LLVMTypeOf(params[1]) == arg_types[1]);
  97
  98    r = LLVMBuildCall(builder, assert_func, params, 2, "");
  99
 100    return r;
 101 }