1 | .\" Copyright (c) 2011 Kai Wang |
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2 | .\" All rights reserved. |
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3 | .\" |
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5 | .\" modification, are permitted provided that the following conditions |
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6 | .\" are met: |
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7 | .\" 1. Redistributions of source code must retain the above copyright |
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13 | .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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14 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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25 | .\" $Id: dwarf_expr_into_block.3 2073 2011-10-27 03:30:47Z jkoshy $ |
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26 | .\" |
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27 | .Dd September 13, 2011 |
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28 | .Os |
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29 | .Dt DWARF_EXPR_INTO_BLOCK 3 |
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30 | .Sh NAME |
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31 | .Nm dwarf_expr_into_block |
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32 | .Nd retrieve the byte stream for a location expression |
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33 | .Sh LIBRARY |
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34 | .Lb libdwarf |
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35 | .Sh SYNOPSIS |
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36 | .In libdwarf.h |
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37 | .Ft "Dwarf_Addr" |
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38 | .Fo dwarf_expr_into_block |
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39 | .Fa "Dwarf_P_Expr expr" |
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40 | .Fa "Dwarf_Unsigned *length" |
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41 | .Fa "Dwarf_Error *err" |
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42 | .Fc |
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43 | .Sh DESCRIPTION |
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44 | Function |
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45 | .Fn dwarf_expr_into_block |
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46 | retrieves the byte stream representation of a location expression. |
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47 | .Pp |
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48 | Argument |
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49 | .Ar expr |
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50 | should reference a location expression descriptor allocated using |
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51 | .Xr dwarf_new_expr 3 . |
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52 | .Pp |
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53 | Argument |
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54 | .Ar length |
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55 | should point to a location which will hold the size in bytes of |
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56 | the retrieved byte stream. |
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57 | .Pp |
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58 | If argument |
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59 | .Ar err |
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60 | is not NULL, it will be used to store error information in case |
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61 | of an error. |
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62 | .Sh RETURN VALUES |
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63 | On success, function |
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64 | .Fn dwarf_expr_into_block |
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65 | returns the address of the first byte of the generated byte stream. |
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66 | In case of an error, function |
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67 | .Fn dwarf_expr_into_block |
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68 | returns |
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69 | .Dv DW_DLV_BADADDR |
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70 | and sets the argument |
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71 | .Ar err . |
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72 | .Sh ERRORS |
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73 | Function |
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74 | .Fn dwarf_expr_into_block |
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75 | can fail with: |
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76 | .Bl -tag -width ".Bq Er DW_DLE_ARGUMENT" |
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77 | .It Bq Er DW_DLE_ARGUMENT |
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78 | One of the arguments |
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79 | .Ar expr |
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80 | or |
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81 | .Ar length |
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82 | was NULL. |
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83 | .It Bq Er DW_DLE_MEMORY |
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84 | An out of memory condition was encountered during the execution of |
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85 | the function. |
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86 | .El |
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87 | .Sh SEE ALSO |
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88 | .Xr dwarf 3 , |
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89 | .Xr dwarf_add_AT_location_expr 3 , |
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90 | .Xr dwarf_add_expr_addr 3 , |
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91 | .Xr dwarf_add_expr_addr_b 3 , |
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92 | .Xr dwarf_add_expr_gen 3 , |
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93 | .Xr dwarf_expr_current_offset 3 , |
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94 | .Xr dwarf_new_expr 3 |
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