ispc/builtins/__do_print_nvptx.cu

/*
  Copyright (c) 2014-2015, Intel Corporation
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are
  met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

    * Neither the name of Intel Corporation nor the names of its
      contributors may be used to endorse or promote products derived from
      this software without specific prior written permission.


   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
   IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <cstdio>

#define PRINT_BUF_SIZE 4096
#define uint64_t unsigned long long

static __device__ size_t d_strlen(const char *str)
{
  const char *s;

  for (s = str; *s; ++s)
    ;
  return (s - str);
}

static __device__  char* d_strncat(char *dest, const char *src, size_t n)
{
  size_t dest_len = d_strlen(dest);
  size_t i;

  for (i = 0 ; i < n && src[i] != '\0' ; i++)
    dest[dest_len + i] = src[i];
  dest[dest_len + i] = '\0';

  return dest;
}
 
#define APPEND(str)                                        \
    do {                                                   \
        int offset = bufp - &printString[0];               \
        *bufp = '\0';                                      \
        d_strncat(bufp, str, PRINT_BUF_SIZE-offset);         \
        bufp += d_strlen(str);                               \
        if (bufp >= &printString[PRINT_BUF_SIZE])          \
            goto done;                                     \
    } while (0) /* eat semicolon */


#define PRINT_SCALAR(fmt, type)                  \
    sprintf(tmpBuf, fmt, *((type *)ptr));        \
    APPEND(tmpBuf);                              \
    break

#define PRINT_VECTOR(fmt, type)                                         \
    *bufp++ = '[';                                                      \
    if (bufp == &printString[PRINT_BUF_SIZE]) break;                    \
    for (int i = 0; i < width; ++i) {                                   \
        /* only print the value if the current lane is executing */     \
        type val0 = *((type*)ptr);                                      \
        type val = val0;                                                \
        if (mask & (1ull<<i))                                           \
            sprintf(tmpBuf, fmt, val);                                  \
        else                                                            \
            sprintf(tmpBuf, "(( * )) ");                                \
        APPEND(tmpBuf);                                                 \
        *bufp++ = (i != width-1 ? ',' : ']');                           \
    }                                                                   \
    break

extern "C"
__device__ void __do_print_nvptx(const char *format, const char *types, int width, uint64_t mask,
                void **args) {
    char printString[PRINT_BUF_SIZE+1]; // +1 for trailing NUL
    char *bufp = &printString[0];
    char tmpBuf[256];
    const char  trueBuf[] = "true";
    const char falseBuf[] = "false";

    int argCount = 0;
    while (*format && bufp < &printString[PRINT_BUF_SIZE]) {
        // Format strings are just single percent signs.
        if (*format != '%') {
            *bufp++ = *format;
        }
        else {
            if (*types) {
                void *ptr = args[argCount++];
                // Based on the encoding in the types string, cast the
                // value appropriately and print it with a reasonable
                // printf() formatting string.
                switch (*types) {
                case 'b': {
                    const char *tmpBuf1 =  *((bool *)ptr) ? trueBuf : falseBuf;
                    APPEND(tmpBuf1);
                    break;
                }
                case 'B': {
                    *bufp++ = '[';
                    if (bufp == &printString[PRINT_BUF_SIZE])
                        break;
                    for (int i = 0; i < width; ++i) {
                        bool val0 = *((bool*)ptr);
                        bool val = val0;                                                \
                        if (mask & (1ull << i)) {
                            const char *tmpBuf1 =  val ? trueBuf : falseBuf;
                            APPEND(tmpBuf1);
                        }
                        else
                            APPEND("_________");
                        *bufp++ = (i != width-1) ? ',' : ']';
                    }
                    break;
                }
                case 'i': PRINT_SCALAR("%d", int);
                case 'I': PRINT_VECTOR("%d", int);
                case 'u': PRINT_SCALAR("%u", unsigned int);
                case 'U': PRINT_VECTOR("%u", unsigned int);
                case 'f': PRINT_SCALAR("%f", float);
                case 'F': PRINT_VECTOR("%f", float);
                case 'l': PRINT_SCALAR("%lld", long long);
                case 'L': PRINT_VECTOR("%lld", long long);
                case 'v': PRINT_SCALAR("%llu", unsigned long long);
                case 'V': PRINT_VECTOR("%llu", unsigned long long);
                case 'd': PRINT_SCALAR("%f", double);
                case 'D': PRINT_VECTOR("%f", double);
                case 'p': PRINT_SCALAR("%p", void *);
                case 'P': PRINT_VECTOR("%p", void *);
                default:
                    APPEND("UNKNOWN TYPE ");
                    *bufp++ = *types;
                }
                ++types;
            }
        }
        ++format;
    }

 done:
    *bufp = '\n'; bufp++;
    *bufp = '\0';
}