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      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 }
    195