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annotate dmd/expression/Slice.d @ 135:af1bebfd96a4 dmd2037

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dmd 2.038
author Eldar Insafutdinov <e.insafutdinov@gmail.com>
date Mon, 13 Sep 2010 22:19:42 +0100
parents e28b18c23469
children
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1 module dmd.expression.Slice;
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3 import dmd.common;
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4 import dmd.Expression;
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5 import dmd.Type;
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6 import dmd.Loc;
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7 import dmd.TOK;
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8 import dmd.StringExp;
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9 import dmd.GlobalExpressions;
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10 import dmd.ArrayLiteralExp;
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11 import dmd.ArrayTypes;
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12 import dmd.Util : printf;
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14 import core.memory;
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15
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16 import core.stdc.stdlib;
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17 import core.stdc.string;
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18
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19 import std.exception;
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21
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22 /* Also return EXP_CANT_INTERPRET if this fails
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23 */
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24 Expression Slice(Type type, Expression e1, Expression lwr, Expression upr)
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25 {
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26 Expression e = EXP_CANT_INTERPRET;
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27 Loc loc = e1.loc;
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28
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29 version (LOG) {
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30 printf("Slice()\n");
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31 if (lwr)
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32 {
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33 printf("\te1 = %s\n", e1.toChars());
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34 printf("\tlwr = %s\n", lwr.toChars());
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35 printf("\tupr = %s\n", upr.toChars());
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36 }
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37 }
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38 if (e1.op == TOKstring && lwr.op == TOKint64 && upr.op == TOKint64)
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39 {
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40 auto es1 = cast(StringExp)e1;
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41 ulong ilwr = lwr.toInteger();
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42 ulong iupr = upr.toInteger();
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43
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44 if (iupr > es1.len || ilwr > iupr)
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45 e1.error("string slice [%ju .. %ju] is out of bounds", ilwr, iupr);
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46 else
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47 {
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48 size_t len = cast(size_t)(iupr - ilwr);
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49 int sz = es1.sz;
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50
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51 char* s = cast(char*)GC.malloc((len + 1) * sz);
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52 memcpy(s, cast(ubyte*)es1.string_ + ilwr * sz, len * sz);
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53 memset(s + len * sz, 0, sz);
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55 auto es = new StringExp(loc, assumeUnique(s[0..len]), es1.postfix);
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56 es.sz = cast(ubyte)sz;
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57 es.committed = 1;
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58 es.type = type;
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59 e = es;
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60 }
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61 }
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62 else if (e1.op == TOKarrayliteral &&
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63 lwr.op == TOKint64 && upr.op == TOKint64 &&
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64 !e1.checkSideEffect(2))
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65 {
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66 auto es1 = cast(ArrayLiteralExp)e1;
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67 ulong ilwr = lwr.toInteger();
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68 ulong iupr = upr.toInteger();
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70 if (iupr > es1.elements.dim || ilwr > iupr)
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71 e1.error("array slice [%ju .. %ju] is out of bounds", ilwr, iupr);
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72 else
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73 {
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74 auto elements = new Expressions();
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75 elements.setDim(cast(uint)(iupr - ilwr));
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76 memcpy(elements.ptr,
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77 es1.elements.ptr + ilwr,
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78 cast(uint)(iupr - ilwr) * (*es1.elements.ptr).sizeof);
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79 e = new ArrayLiteralExp(e1.loc, elements);
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80 e.type = type;
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81 }
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82 }
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83 return e;
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84 }