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annotate druntime/src/compiler/dmd/alloca.d @ 759:d3eb054172f9

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Added copy of druntime from DMD 2.020 modified for LDC.
author Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
date Tue, 11 Nov 2008 01:52:37 +0100
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759
d3eb054172f9 Added copy of druntime from DMD 2.020 modified for LDC.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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1 /*_ _alloca.d
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2 * Copyright (C) 1990-2003 by Digital Mars, www.digitalmars.com
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3 * All Rights Reserved
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4 * Written by Walter Bright
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5 */
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6
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7 module rt.alloca;
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8
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9 /+
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10 #if DOS386
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11 extern size_t _x386_break;
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12 #else
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13 extern size_t _pastdata;
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14 #endif
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15 +/
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16
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17 /*******************************************
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18 * Allocate data from the caller's stack frame.
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19 * This is a 'magic' function that needs help from the compiler to
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20 * work right, do not change its name, do not call it from other compilers.
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21 * Input:
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22 * nbytes number of bytes to allocate
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23 * ECX address of variable with # of bytes in locals
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24 * This is adjusted upon return to reflect the additional
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25 * size of the stack frame.
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26 * Returns:
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27 * EAX allocated data, null if stack overflows
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28 */
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29
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30 extern (C) void* __alloca(int nbytes)
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31 {
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32 asm
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33 {
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34 naked ;
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35 mov EDX,ECX ;
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36 mov EAX,4[ESP] ; // get nbytes
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37 push EBX ;
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38 push EDI ;
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39 push ESI ;
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40 add EAX,3 ;
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41 and EAX,0xFFFFFFFC ; // round up to dword
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42 jnz Abegin ;
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43 mov EAX,4 ; // allow zero bytes allocation, 0 rounded to dword is 4..
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44 Abegin:
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45 mov ESI,EAX ; // ESI = nbytes
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46 neg EAX ;
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47 add EAX,ESP ; // EAX is now what the new ESP will be.
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48 jae Aoverflow ;
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49 }
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50 version (Windows)
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51 {
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52 asm
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53 {
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54 // We need to be careful about the guard page
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55 // Thus, for every 4k page, touch it to cause the OS to load it in.
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56 mov ECX,EAX ; // ECX is new location for stack
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57 mov EBX,ESI ; // EBX is size to "grow" stack
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58 L1:
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59 test [ECX+EBX],EBX ; // bring in page
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60 sub EBX,0x1000 ; // next 4K page down
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61 jae L1 ; // if more pages
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62 test [ECX],EBX ; // bring in last page
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63 }
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64 }
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65 version (DOS386)
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66 {
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67 asm
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68 {
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69 // is ESP off bottom?
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70 cmp EAX,_x386_break ;
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71 jbe Aoverflow ;
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72 }
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73 }
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74 version (Unix)
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75 {
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76 asm
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77 {
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78 cmp EAX,_pastdata ;
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79 jbe Aoverflow ; // Unlikely - ~2 Gbytes under UNIX
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80 }
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81 }
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82 asm
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83 {
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84 // Copy down to [ESP] the temps on the stack.
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85 // The number of temps is (EBP - ESP - locals).
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86 mov ECX,EBP ;
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87 sub ECX,ESP ;
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88 sub ECX,[EDX] ; // ECX = number of temps (bytes) to move.
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89 add [EDX],ESI ; // adjust locals by nbytes for next call to alloca()
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90 mov ESP,EAX ; // Set up new stack pointer.
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91 add EAX,ECX ; // Return value = ESP + temps.
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92 mov EDI,ESP ; // Destination of copy of temps.
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93 add ESI,ESP ; // Source of copy.
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94 shr ECX,2 ; // ECX to count of dwords in temps
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95 // Always at least 4 (nbytes, EIP, ESI,and EDI).
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96 rep ;
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97 movsd ;
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98 jmp done ;
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99
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100 Aoverflow:
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101 // Overflowed the stack. Return null
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102 xor EAX,EAX ;
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103
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104 done:
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105 pop ESI ;
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106 pop EDI ;
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107 pop EBX ;
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108 ret ;
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109 }
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110 }