src/gallium/auxiliary/gallivm/lp_bld_printf.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 <stdio.h>
  29
  30 #include "util/u_debug.h"
  31 #include "util/u_memory.h"
  32 #include "util/u_string.h"
  33 #include "lp_bld_const.h"
  34 #include "lp_bld_init.h"
  35 #include "lp_bld_const.h"
  36 #include "lp_bld_printf.h"
  37
  38
  39 static int
  40 lp_get_printf_arg_count(const char *fmt)
  41 {
  42    int count =0;
  43    const char *p = fmt;
  44    int c;
  45
  46    while ((c = *p++)) {
  47       if (c != '%')
  48          continue;
  49       switch (*p) {
  50          case '\0':
  51             continue;
  52          case '%':
  53             p++;
  54             continue;
  55          case '.':
  56             if (p[1] == '*' && p[2] == 's') {
  57                count += 2;
  58                p += 3;
  59                continue;
  60             }
  61             /* fallthrough */
  62          default:
  63             count ++;
  64       }
  65    }
  66    return count;
  67 }
  68
  69 LLVMValueRef
  70 lp_build_const_string_variable(LLVMModuleRef module,
  71                                LLVMContextRef context,
  72                                const char *str, int len)
  73 {
  74    LLVMValueRef string = LLVMAddGlobal(module, LLVMArrayType(LLVMInt8TypeInContext(context), len + 1), "");
  75    LLVMSetGlobalConstant(string, TRUE);
  76    LLVMSetLinkage(string, LLVMInternalLinkage);
  77    LLVMSetInitializer(string, LLVMConstStringInContext(context, str, len + 1, TRUE));
  78    return string;
  79 }
  80
  81
  82 /**
  83  * lp_build_printf.
  84  *
  85  * Build printf call in LLVM IR. The output goes to stdout.
  86  * The additional variable arguments need to have type
  87  * LLVMValueRef.
  88  */
  89 LLVMValueRef
  90 lp_build_printf(struct gallivm_state *gallivm, const char *fmt, ...)
  91 {
  92    va_list arglist;
  93    int i = 0;
  94    int argcount = lp_get_printf_arg_count(fmt);
  95    LLVMBuilderRef builder = gallivm->builder;
  96    LLVMContextRef context = gallivm->context;
  97    LLVMModuleRef module = gallivm->module;
  98    LLVMValueRef params[50];
  99    LLVMValueRef fmtarg = lp_build_const_string_variable(module, context,
 100                                                         fmt, strlen(fmt) + 1);
 101    LLVMValueRef int0 = lp_build_const_int32(gallivm, 0);
 102    LLVMValueRef index[2];
 103    LLVMValueRef func_printf = LLVMGetNamedFunction(module, "printf");
 104
 105    assert(Elements(params) >= argcount + 1);
 106
 107    index[0] = index[1] = int0;
 108
 109    if (!func_printf) {
 110       LLVMTypeRef printf_type = LLVMFunctionType(LLVMIntTypeInContext(context, 32), NULL, 0, 1);
 111       func_printf = LLVMAddFunction(module, "printf", printf_type);
 112    }
 113
 114    params[0] = LLVMBuildGEP(builder, fmtarg, index, 2, "");
 115
 116    va_start(arglist, fmt);
 117    for (i = 1; i <= argcount; i++) {
 118       LLVMValueRef val = va_arg(arglist, LLVMValueRef);
 119       LLVMTypeRef type = LLVMTypeOf(val);
 120       /* printf wants doubles, so lets convert so that
 121        * we can actually print them */
 122       if (LLVMGetTypeKind(type) == LLVMFloatTypeKind)
 123          val = LLVMBuildFPExt(builder, val, LLVMDoubleTypeInContext(context), "");
 124       params[i] = val;
 125    }
 126    va_end(arglist);
 127
 128    return LLVMBuildCall(builder, func_printf, params, argcount + 1, "");
 129 }
 130
 131
 132
 133 /**
 134  * Print a float[4] vector.
 135  */
 136 LLVMValueRef
 137 lp_build_print_vec4(struct gallivm_state *gallivm,
 138                     const char *msg, LLVMValueRef vec)
 139 {
 140    LLVMBuilderRef builder = gallivm->builder;
 141    char format[1000];
 142    LLVMValueRef x, y, z, w;
 143
 144    x = LLVMBuildExtractElement(builder, vec, lp_build_const_int32(gallivm, 0), "");
 145    y = LLVMBuildExtractElement(builder, vec, lp_build_const_int32(gallivm, 1), "");
 146    z = LLVMBuildExtractElement(builder, vec, lp_build_const_int32(gallivm, 2), "");
 147    w = LLVMBuildExtractElement(builder, vec, lp_build_const_int32(gallivm, 3), "");
 148
 149    util_snprintf(format, sizeof(format), "%s %%f %%f %%f %%f\n", msg);
 150    return lp_build_printf(gallivm, format, x, y, z, w);
 151 }