File : s-traceb-mastop.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- S Y S T E M . T R A C E B A C K --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1999-2015, AdaCore --
10 -- --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
17 -- --
18 -- --
19 -- --
20 -- --
21 -- --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
26 -- --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
29 -- --
30 ------------------------------------------------------------------------------
31
32 -- This version uses System.Machine_State_Operations routines
33
34 with System.Machine_State_Operations;
35
36 package body System.Traceback is
37
38 use System.Machine_State_Operations;
39
40 procedure Call_Chain
41 (Traceback : System.Address;
42 Max_Len : Natural;
43 Len : out Natural;
44 Exclude_Min : System.Address := System.Null_Address;
45 Exclude_Max : System.Address := System.Null_Address;
46 Skip_Frames : Natural := 1);
47 -- Same as the exported version, but takes Traceback as an Address
48
49 ----------------
50 -- Call_Chain --
51 ----------------
52
53 procedure Call_Chain
54 (Traceback : System.Address;
55 Max_Len : Natural;
56 Len : out Natural;
57 Exclude_Min : System.Address := System.Null_Address;
58 Exclude_Max : System.Address := System.Null_Address;
59 Skip_Frames : Natural := 1)
60 is
61 type Tracebacks_Array is array (1 .. Max_Len) of Code_Loc;
62 pragma Suppress_Initialization (Tracebacks_Array);
63
64 M : Machine_State;
65 Code : Code_Loc;
66
67 Trace : Tracebacks_Array;
68 for Trace'Address use Traceback;
69
70 N_Skips : Natural := 0;
71
72 begin
73 M := Allocate_Machine_State;
74 Set_Machine_State (M);
75
76 -- Skip the requested number of frames
77
78 loop
79 Code := Get_Code_Loc (M);
80 exit when Code = Null_Address or else N_Skips = Skip_Frames;
81
82 Pop_Frame (M);
83 N_Skips := N_Skips + 1;
84 end loop;
85
86 -- Now, record the frames outside the exclusion bounds, updating
87 -- the Len output value along the way.
88
89 Len := 0;
90 loop
91 Code := Get_Code_Loc (M);
92 exit when Code = Null_Address or else Len = Max_Len;
93
94 if Code < Exclude_Min or else Code > Exclude_Max then
95 Len := Len + 1;
96 Trace (Len) := Code;
97 end if;
98
99 Pop_Frame (M);
100 end loop;
101
102 Free_Machine_State (M);
103 end Call_Chain;
104
105 procedure Call_Chain
106 (Traceback : in out System.Traceback_Entries.Tracebacks_Array;
107 Max_Len : Natural;
108 Len : out Natural;
109 Exclude_Min : System.Address := System.Null_Address;
110 Exclude_Max : System.Address := System.Null_Address;
111 Skip_Frames : Natural := 1)
112 is
113 begin
114 Call_Chain
115 (Traceback'Address, Max_Len, Len,
116 Exclude_Min, Exclude_Max,
117
118 -- Skip one extra frame to skip the other Call_Chain entry as well
119
120 Skip_Frames => Skip_Frames + 1);
121 end Call_Chain;
122
123 ------------------
124 -- C_Call_Chain --
125 ------------------
126
127 function C_Call_Chain
128 (Traceback : System.Address;
129 Max_Len : Natural) return Natural
130 is
131 Val : Natural;
132 begin
133 Call_Chain (Traceback, Max_Len, Val);
134 return Val;
135 end C_Call_Chain;
136
137 end System.Traceback;