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 #include <inttypes.h>
  30
  31 #include "util/u_debug.h"
  32 #include "util/u_memory.h"
  33 #include "util/u_string.h"
  34 #include "lp_bld_const.h"
  35 #include "lp_bld_init.h"
  36 #include "lp_bld_const.h"
  37 #include "lp_bld_printf.h"
  38 #include "lp_bld_type.h"
  39
  40
  41 /**
  42  * Generates LLVM IR to call debug_printf.
  43  */
  44 static LLVMValueRef
  45 lp_build_print_args(struct gallivm_state* gallivm,
  46                     int argcount,
  47                     LLVMValueRef* args)
  48 {
  49    LLVMBuilderRef builder = gallivm->builder;
  50    LLVMContextRef context = gallivm->context;
  51    LLVMValueRef func_printf;
  52    LLVMTypeRef printf_type;
  53    int i;
  54
  55    assert(args);
  56    assert(argcount > 0);
  57    assert(LLVMTypeOf(args[0]) == LLVMPointerType(LLVMInt8TypeInContext(context), 0));
  58
  59    /* Cast any float arguments to doubles as printf expects */
  60    for (i = 1; i < argcount; i++) {
  61       LLVMTypeRef type = LLVMTypeOf(args[i]);
  62
  63       if (LLVMGetTypeKind(type) == LLVMFloatTypeKind)
  64          args[i] = LLVMBuildFPExt(builder, args[i], LLVMDoubleTypeInContext(context), "");
  65    }
  66
  67    printf_type = LLVMFunctionType(LLVMInt32TypeInContext(context), NULL, 0, 1);
  68    func_printf = lp_build_const_int_pointer(gallivm, func_to_pointer((func_pointer)debug_printf));
  69    func_printf = LLVMBuildBitCast(builder, func_printf, LLVMPointerType(printf_type, 0), "debug_printf");
  70
  71    return LLVMBuildCall(builder, func_printf, args, argcount, "");
  72 }
  73
  74
  75 /**
  76  * Print a LLVM value of any type
  77  */
  78 LLVMValueRef
  79 lp_build_print_value(struct gallivm_state *gallivm,
  80                      const char *msg,
  81                      LLVMValueRef value)
  82 {
  83    LLVMBuilderRef builder = gallivm->builder;
  84    LLVMTypeKind type_kind;
  85    LLVMTypeRef type_ref;
  86    LLVMValueRef params[2 + LP_MAX_VECTOR_LENGTH];
  87    char type_fmt[6] = " %x";
  88    char format[2 + 5 * LP_MAX_VECTOR_LENGTH + 2] = "%s";
  89    unsigned length;
  90    unsigned i;
  91
  92    type_ref = LLVMTypeOf(value);
  93    type_kind = LLVMGetTypeKind(type_ref);
  94
  95    if (type_kind == LLVMVectorTypeKind) {
  96       length = LLVMGetVectorSize(type_ref);
  97
  98       type_ref = LLVMGetElementType(type_ref);
  99       type_kind = LLVMGetTypeKind(type_ref);
 100    } else {
 101       length = 1;
 102    }
 103
 104    if (type_kind == LLVMFloatTypeKind || type_kind == LLVMDoubleTypeKind) {
 105       type_fmt[2] = '.';
 106       type_fmt[3] = '9';
 107       type_fmt[4] = 'g';
 108       type_fmt[5] = '\0';
 109    } else if (type_kind == LLVMIntegerTypeKind) {
 110       if (LLVMGetIntTypeWidth(type_ref) == 64) {
 111          util_snprintf(type_fmt + 2, 3, "%s", PRId64);
 112       } else if (LLVMGetIntTypeWidth(type_ref) == 8) {
 113          type_fmt[2] = 'u';
 114       } else {
 115          type_fmt[2] = 'i';
 116       }
 117    } else if (type_kind == LLVMPointerTypeKind) {
 118       type_fmt[2] = 'p';
 119    } else {
 120       /* Unsupported type */
 121       assert(0);
 122    }
 123
 124    /* Create format string and arguments */
 125    assert(strlen(format) + strlen(type_fmt) * length + 2 <= sizeof format);
 126
 127    params[1] = lp_build_const_string(gallivm, msg);
 128    if (length == 1) {
 129       util_strncat(format, type_fmt, sizeof(format) - strlen(format) - 1);
 130       params[2] = value;
 131    } else {
 132       for (i = 0; i < length; ++i) {
 133          LLVMValueRef param;
 134          util_strncat(format, type_fmt, sizeof(format) - strlen(format) - 1);
 135          param = LLVMBuildExtractElement(builder, value, lp_build_const_int32(gallivm, i), "");
 136          if (type_kind == LLVMIntegerTypeKind &&
 137              LLVMGetIntTypeWidth(type_ref) < sizeof(int) * 8) {
 138             LLVMTypeRef int_type = LLVMIntTypeInContext(gallivm->context, sizeof(int) * 8);
 139             if (LLVMGetIntTypeWidth(type_ref) == 8) {
 140                param = LLVMBuildZExt(builder, param, int_type, "");
 141             } else {
 142                param = LLVMBuildSExt(builder, param, int_type, "");
 143             }
 144          }
 145          params[2 + i] = param;
 146       }
 147    }
 148
 149    util_strncat(format, "\n", sizeof(format) - strlen(format) - 1);
 150
 151    params[0] = lp_build_const_string(gallivm, format);
 152    return lp_build_print_args(gallivm, 2 + length, params);
 153 }
 154
 155
 156 static unsigned
 157 lp_get_printf_arg_count(const char *fmt)
 158 {
 159    unsigned count = 0;
 160    const char *p = fmt;
 161    int c;
 162
 163    while ((c = *p++)) {
 164       if (c != '%')
 165          continue;
 166       switch (*p) {
 167          case '\0':
 168        continue;
 169          case '%':
 170        p++;
 171        continue;
 172     case '.':
 173        if (p[1] == '*' && p[2] == 's') {
 174           count += 2;
 175           p += 3;
 176                continue;
 177        }
 178        /* fallthrough */
 179     default:
 180        count ++;
 181       }
 182    }
 183    return count;
 184 }
 185
 186
 187 /**
 188  * Generate LLVM IR for a c style printf
 189  */
 190 LLVMValueRef
 191 lp_build_printf(struct gallivm_state *gallivm,
 192                 const char *fmt, ...)
 193 {
 194    LLVMValueRef params[50];
 195    va_list arglist;
 196    unsigned argcount, i;
 197
 198    argcount = lp_get_printf_arg_count(fmt);
 199    assert(ARRAY_SIZE(params) >= argcount + 1);
 200
 201    va_start(arglist, fmt);
 202    for (i = 1; i <= argcount; i++) {
 203       params[i] = va_arg(arglist, LLVMValueRef);
 204    }
 205    va_end(arglist);
 206
 207    params[0] = lp_build_const_string(gallivm, fmt);
 208    return lp_build_print_args(gallivm, argcount + 1, params);
 209 }