author | Shane McErlean <shane.mcerlean@accenture.com> |
Fri, 27 Aug 2010 15:33:49 +0100 | |
changeset 101 | 1e82a8be084a |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
1
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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1 |
/* Parse tree node implementation */ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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2 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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3 |
#include "Python.h" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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4 |
#include "node.h" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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5 |
#include "errcode.h" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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6 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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7 |
node * |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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8 |
PyNode_New(int type) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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9 |
{ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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10 |
node *n = (node *) PyObject_MALLOC(1 * sizeof(node)); |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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11 |
if (n == NULL) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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12 |
return NULL; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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n->n_type = type; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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14 |
n->n_str = NULL; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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n->n_lineno = 0; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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n->n_nchildren = 0; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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n->n_child = NULL; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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18 |
return n; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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19 |
} |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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20 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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/* See comments at XXXROUNDUP below. Returns -1 on overflow. */ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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static int |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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23 |
fancy_roundup(int n) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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24 |
{ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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25 |
/* Round up to the closest power of 2 >= n. */ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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26 |
int result = 256; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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27 |
assert(n > 128); |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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28 |
while (result < n) { |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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result <<= 1; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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if (result <= 0) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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31 |
return -1; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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32 |
} |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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33 |
return result; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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34 |
} |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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35 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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36 |
/* A gimmick to make massive numbers of reallocs quicker. The result is |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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37 |
* a number >= the input. In PyNode_AddChild, it's used like so, when |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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38 |
* we're about to add child number current_size + 1: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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39 |
* |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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40 |
* if XXXROUNDUP(current_size) < XXXROUNDUP(current_size + 1): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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* allocate space for XXXROUNDUP(current_size + 1) total children |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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42 |
* else: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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43 |
* we already have enough space |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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44 |
* |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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45 |
* Since a node starts out empty, we must have |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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46 |
* |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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47 |
* XXXROUNDUP(0) < XXXROUNDUP(1) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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48 |
* |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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49 |
* so that we allocate space for the first child. One-child nodes are very |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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50 |
* common (presumably that would change if we used a more abstract form |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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51 |
* of syntax tree), so to avoid wasting memory it's desirable that |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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52 |
* XXXROUNDUP(1) == 1. That in turn forces XXXROUNDUP(0) == 0. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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53 |
* |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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54 |
* Else for 2 <= n <= 128, we round up to the closest multiple of 4. Why 4? |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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55 |
* Rounding up to a multiple of an exact power of 2 is very efficient, and |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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56 |
* most nodes with more than one child have <= 4 kids. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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57 |
* |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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58 |
* Else we call fancy_roundup() to grow proportionately to n. We've got an |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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59 |
* extreme case then (like test_longexp.py), and on many platforms doing |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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60 |
* anything less than proportional growth leads to exorbitant runtime |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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61 |
* (e.g., MacPython), or extreme fragmentation of user address space (e.g., |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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62 |
* Win98). |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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63 |
* |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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64 |
* In a run of compileall across the 2.3a0 Lib directory, Andrew MacIntyre |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
65 |
* reported that, with this scheme, 89% of PyObject_REALLOC calls in |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
66 |
* PyNode_AddChild passed 1 for the size, and 9% passed 4. So this usually |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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67 |
* wastes very little memory, but is very effective at sidestepping |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
68 |
* platform-realloc disasters on vulnerable platforms. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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69 |
* |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
70 |
* Note that this would be straightforward if a node stored its current |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
71 |
* capacity. The code is tricky to avoid that. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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72 |
*/ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
73 |
#define XXXROUNDUP(n) ((n) <= 1 ? (n) : \ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
74 |
(n) <= 128 ? (((n) + 3) & ~3) : \ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
75 |
fancy_roundup(n)) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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76 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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77 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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78 |
int |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
79 |
PyNode_AddChild(register node *n1, int type, char *str, int lineno, int col_offset) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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80 |
{ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
81 |
const int nch = n1->n_nchildren; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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82 |
int current_capacity; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
83 |
int required_capacity; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
84 |
node *n; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
85 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
86 |
if (nch == INT_MAX || nch < 0) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
87 |
return E_OVERFLOW; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
88 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
89 |
current_capacity = XXXROUNDUP(nch); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
90 |
required_capacity = XXXROUNDUP(nch + 1); |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
91 |
if (current_capacity < 0 || required_capacity < 0) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
92 |
return E_OVERFLOW; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
93 |
if (current_capacity < required_capacity) { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
94 |
if (required_capacity > PY_SIZE_MAX / sizeof(node)) { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
95 |
return E_NOMEM; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
96 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
97 |
n = n1->n_child; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
98 |
n = (node *) PyObject_REALLOC(n, |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
99 |
required_capacity * sizeof(node)); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
100 |
if (n == NULL) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
101 |
return E_NOMEM; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
102 |
n1->n_child = n; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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|
103 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
104 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
105 |
n = &n1->n_child[n1->n_nchildren++]; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
106 |
n->n_type = type; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
107 |
n->n_str = str; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
108 |
n->n_lineno = lineno; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
109 |
n->n_col_offset = col_offset; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
110 |
n->n_nchildren = 0; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
111 |
n->n_child = NULL; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
112 |
return 0; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
113 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
114 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
115 |
/* Forward */ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
116 |
static void freechildren(node *); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
117 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
118 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
119 |
void |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
120 |
PyNode_Free(node *n) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
121 |
{ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
122 |
if (n != NULL) { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
123 |
freechildren(n); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
124 |
PyObject_FREE(n); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
125 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
126 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
127 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
128 |
static void |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
129 |
freechildren(node *n) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
130 |
{ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
131 |
int i; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
132 |
for (i = NCH(n); --i >= 0; ) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
133 |
freechildren(CHILD(n, i)); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
134 |
if (n->n_child != NULL) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
135 |
PyObject_FREE(n->n_child); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
136 |
if (STR(n) != NULL) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
137 |
PyObject_FREE(STR(n)); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
138 |
} |