#include <limits.h> /* definition of LONG_MIN, used in sc_get_val_from_long */
#include "strcalc.h"
+#include "xmalloc.h"
/*
* local definitions and macros
However, the meaning of carry is machine dependent
and often defined in other ways! */
+static const char sex_digit[4] = { SC_E, SC_C, SC_8, SC_0 };
static const char max_digit[4] = { SC_0, SC_1, SC_3, SC_7 };
static const char min_digit[4] = { SC_F, SC_E, SC_C, SC_8 };
return (void*)calc_buffer;
}
-const int sc_get_buffer_length(void)
+int sc_get_buffer_length(void)
{
return calc_buffer_size;
}
+/**
+ * Do sign extension if the mode is signed, expects all upper bits
+ * cleared.
+ */
+static void sign_extend(char *calc_buffer, ir_mode *mode) {
+ if (mode_is_signed(mode)) {
+ int bits = get_mode_size_bits(mode) - 1;
+ int ofs = bits >> 2;
+ int max = max_digit[bits & 3];
+ int i;
+
+ if (calc_buffer[ofs] > max) {
+ /* sign bit is set, we need sign expansion */
+
+ for (i = ofs + 1; i < calc_buffer_size; ++i)
+ calc_buffer[i] = SC_F;
+ calc_buffer[ofs] = or_table[calc_buffer[ofs]][sex_digit[bits & 3]];
+ }
+ }
+}
+
/* FIXME doesn't check for overflows */
-void sc_val_from_str(const char *str, unsigned int len, void *buffer)
+void sc_val_from_str(const char *str, unsigned int len, void *buffer, ir_mode *mode)
{
const char *orig_str = str;
unsigned int orig_len = len;
if (buffer == NULL) buffer = calc_buffer;
CLEAR_BUFFER(buffer);
- memset(base, SC_0, calc_buffer_size);
- memset(val, SC_0, calc_buffer_size);
+ CLEAR_BUFFER(base);
+ CLEAR_BUFFER(val);
/* strip leading spaces */
while ((len > 0) && (*str == ' ')) { len--; str++; }
} /* while (len > 0 ) */
if (sign)
- {
_negate(calc_buffer, calc_buffer);
- }
+
+ /* beware: even if hex numbers have no sign, we need sign extension here */
+ sign_extend(calc_buffer, mode);
}
void sc_val_from_long(long value, void *buffer)
sign = (value < 0);
is_minlong = value == LONG_MIN;
- /* use absolute value, special treatment of MIN_LONG */
+ /* use absolute value, special treatment of MIN_LONG to avoid overflow */
if (sign) {
if (is_minlong)
value = -(value+1);
value >>= 4;
}
-
if (sign) {
if (is_minlong)
_inc(buffer, buffer);
void sc_val_from_ulong(unsigned long value, void *buffer)
{
- char *pos;
+ unsigned char *pos;
if (buffer == NULL) buffer = calc_buffer;
pos = buffer;
- while (pos < (char*)buffer + calc_buffer_size)
+ while (pos < (unsigned char *)buffer + calc_buffer_size)
{
- *pos++ = _digit(value & 0xf);
+ *pos++ = (unsigned char)_digit(value & 0xf);
value >>= 4;
}
}
unsigned char sc_sub_bits(const void *value, int len, unsigned byte_ofs)
{
- const char *val = (const char *)value;
- unsigned nibble_ofs = 2 * byte_ofs;
+ const char *val = (const char *)value;
+ int nibble_ofs = 2 * byte_ofs;
unsigned char res;
/* the current scheme uses one byte to store a nibble */
calc_buffer_size = (precision / 2);
max_value_size = (precision / 4);
- calc_buffer = malloc(calc_buffer_size+1 * sizeof(char));
- output_buffer = malloc(bit_pattern_size+1 * sizeof(char));
+ calc_buffer = xmalloc(calc_buffer_size+1 * sizeof(char));
+ output_buffer = xmalloc(bit_pattern_size+1 * sizeof(char));
if (calc_buffer == NULL || output_buffer == NULL) {
assert(0 && "malloc failed");