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
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  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
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  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(struct gallivm_state *gallivm,
  60                 LLVMValueRef condition,
  61                 const char *msg)
  62 {
  63    LLVMBuilderRef builder = gallivm->builder;
  64    LLVMContextRef context = gallivm->context;
  65    LLVMModuleRef module = gallivm->module;
  66    LLVMTypeRef arg_types[2];
  67    LLVMValueRef msg_string, assert_func, params[2], r;
  68
  69    msg_string = lp_build_const_string_variable(module, context,
  70                                                msg, strlen(msg) + 1);
  71
  72    arg_types[0] = LLVMInt32TypeInContext(context);
  73    arg_types[1] = LLVMPointerType(LLVMInt8TypeInContext(context), 0);
  74
  75    /* lookup the lp_assert function */
  76    assert_func = LLVMGetNamedFunction(module, "lp_assert");
  77
  78    /* Create the assertion function if not found */
  79    if (!assert_func) {
  80       LLVMTypeRef func_type =
  81          LLVMFunctionType(LLVMVoidTypeInContext(context), arg_types, 2, 0);
  82
  83       assert_func = LLVMAddFunction(module, "lp_assert", func_type);
  84       LLVMSetFunctionCallConv(assert_func, LLVMCCallConv);
  85       LLVMSetLinkage(assert_func, LLVMExternalLinkage);
  86       LLVMAddGlobalMapping(gallivm->engine, assert_func,
  87                            func_to_pointer((func_pointer)lp_assert));
  88    }
  89    assert(assert_func);
  90
  91    /* build function call param list */
  92    params[0] = LLVMBuildZExt(builder, condition, arg_types[0], "");
  93    params[1] = LLVMBuildBitCast(builder, msg_string, arg_types[1], "");
  94
  95    /* check arg types */
  96    assert(LLVMTypeOf(params[0]) == arg_types[0]);
  97    assert(LLVMTypeOf(params[1]) == arg_types[1]);
  98
  99    r = LLVMBuildCall(builder, assert_func, params, 2, "");
 100
 101    return r;
 102 }