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 #include "lp_bld_type.h"
  38
  39
  40 /**
  41  * Generates LLVM IR to call debug_printf.
  42  */
  43 static LLVMValueRef
  44 lp_build_print_args(struct gallivm_state* gallivm,
  45                     int argcount,
  46                     LLVMValueRef* args)
  47 {
  48    LLVMBuilderRef builder = gallivm->builder;
  49    LLVMContextRef context = gallivm->context;
  50    LLVMValueRef func_printf;
  51    LLVMTypeRef printf_type;
  52    int i;
  53
  54    assert(args);
  55    assert(argcount > 0);
  56    assert(LLVMTypeOf(args[0]) == LLVMPointerType(LLVMInt8TypeInContext(context), 0));
  57
  58    /* Cast any float arguments to doubles as printf expects */
  59    for (i = 1; i < argcount; i++) {
  60       LLVMTypeRef type = LLVMTypeOf(args[i]);
  61
  62       if (LLVMGetTypeKind(type) == LLVMFloatTypeKind)
  63          args[i] = LLVMBuildFPExt(builder, args[i], LLVMDoubleTypeInContext(context), "");
  64    }
  65
  66    printf_type = LLVMFunctionType(LLVMInt32TypeInContext(context), NULL, 0, 1);
  67    func_printf = lp_build_const_int_pointer(gallivm, func_to_pointer((func_pointer)debug_printf));
  68    func_printf = LLVMBuildBitCast(builder, func_printf, LLVMPointerType(printf_type, 0), "debug_printf");
  69
  70    return LLVMBuildCall(builder, func_printf, args, argcount, "");
  71 }
  72
  73
  74 /**
  75  * Print a LLVM value of any type
  76  */
  77 LLVMValueRef
  78 lp_build_print_value(struct gallivm_state *gallivm,
  79                      const char *msg,
  80                      LLVMValueRef value)
  81 {
  82    LLVMBuilderRef builder = gallivm->builder;
  83    LLVMTypeKind type_kind;
  84    LLVMTypeRef type_ref;
  85    LLVMValueRef params[2 + LP_MAX_VECTOR_LENGTH];
  86    char type_fmt[6] = " %x";
  87    char format[2 + 5 * LP_MAX_VECTOR_LENGTH + 2] = "%s";
  88    unsigned length;
  89    unsigned i;
  90
  91    type_ref = LLVMTypeOf(value);
  92    type_kind = LLVMGetTypeKind(type_ref);
  93
  94    if (type_kind == LLVMVectorTypeKind) {
  95       length = LLVMGetVectorSize(type_ref);
  96
  97       type_ref = LLVMGetElementType(type_ref);
  98       type_kind = LLVMGetTypeKind(type_ref);
  99    } else {
 100       length = 1;
 101    }
 102
 103    if (type_kind == LLVMFloatTypeKind || type_kind == LLVMDoubleTypeKind) {
 104       type_fmt[2] = '.';
 105       type_fmt[3] = '9';
 106       type_fmt[4] = 'g';
 107       type_fmt[5] = '\0';
 108    } else if (type_kind == LLVMIntegerTypeKind) {
 109       if (LLVMGetIntTypeWidth(type_ref) == 8) {
 110          type_fmt[2] = 'u';
 111       } else {
 112          type_fmt[2] = 'i';
 113       }
 114    } else {
 115       /* Unsupported type */
 116       assert(0);
 117    }
 118
 119    /* Create format string and arguments */
 120    assert(strlen(format) + strlen(type_fmt) * length + 2 <= sizeof format);
 121
 122    params[1] = lp_build_const_string(gallivm, msg);
 123    if (length == 1) {
 124       util_strncat(format, type_fmt, sizeof(format) - strlen(format) - 1);
 125       params[2] = value;
 126    } else {
 127       for (i = 0; i < length; ++i) {
 128          util_strncat(format, type_fmt, sizeof(format) - strlen(format) - 1);
 129          params[2 + i] = LLVMBuildExtractElement(builder, value, lp_build_const_int32(gallivm, i), "");
 130       }
 131    }
 132
 133    util_strncat(format, "\n", sizeof(format) - strlen(format) - 1);
 134
 135    params[0] = lp_build_const_string(gallivm, format);
 136    return lp_build_print_args(gallivm, 2 + length, params);
 137 }
 138
 139
 140 static int
 141 lp_get_printf_arg_count(const char *fmt)
 142 {
 143    int count =0;
 144    const char *p = fmt;
 145    int c;
 146
 147    while ((c = *p++)) {
 148       if (c != '%')
 149          continue;
 150       switch (*p) {
 151          case '\0':
 152        continue;
 153          case '%':
 154        p++;
 155        continue;
 156     case '.':
 157        if (p[1] == '*' && p[2] == 's') {
 158           count += 2;
 159           p += 3;
 160                continue;
 161        }
 162        /* fallthrough */
 163     default:
 164        count ++;
 165       }
 166    }
 167    return count;
 168 }
 169
 170
 171 /**
 172  * Generate LLVM IR for a c style printf
 173  */
 174 LLVMValueRef
 175 lp_build_printf(struct gallivm_state *gallivm,
 176                 const char *fmt, ...)
 177 {
 178    LLVMValueRef params[50];
 179    va_list arglist;
 180    int argcount;
 181    int i;
 182
 183    argcount = lp_get_printf_arg_count(fmt);
 184    assert(Elements(params) >= argcount + 1);
 185
 186    va_start(arglist, fmt);
 187    for (i = 1; i <= argcount; i++) {
 188       params[i] = va_arg(arglist, LLVMValueRef);
 189    }
 190    va_end(arglist);
 191
 192    params[0] = lp_build_const_string(gallivm, fmt);
 193    return lp_build_print_args(gallivm, argcount + 1, params);
 194 }