1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
{
Copyright (c) 1998-2003 by Peter Vreman, Florian Klaempfl and Carl Eric Codere
Basic stuff for assembler readers
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit rasm;
{$i fpcdefs.inc}
interface
uses
cclasses,
symsym,
rabase,
aasmbase,
aasmdata,
cpubase,
cgbase;
type
tasmreader = class(tbaseasmreader)
firsttoken : boolean;
_asmsorted : boolean;
curlist : TAsmList;
c : char;
actasmpattern : string;
actopcode : tasmop;
actasmregister : tregister;
actcondition : tasmcond;
iasmops : TFPHashList;
locallabels : TFPHashObjectList;
constructor create;override;
destructor destroy;override;
function createlocallabel(const s: string; var hl: tasmlabel; emit: boolean): boolean;
procedure checklocallabels;
protected
{ allow subscripting a local if it is a:
1) pointer to a records/object, or a class instance pointer, passed in a register to a pure assembler routine
2) record located on the stack (passed as parameter, or local variable)
}
procedure checklocalsubscript(sym: tabstractnormalvarsym); virtual;
end;
implementation
uses
verbose,
procinfo,
symconst,symdef,
paramgr;
type
TLocalLabel = class(TFPHashObject)
emitted: boolean;
lab: tasmlabel;
function Gettasmlabel: tasmlabel;
end;
function TLocalLabel.Gettasmlabel:tasmlabel;
begin
if not assigned(lab) then
begin
current_asmdata.getjumplabel(lab);
{ this label is forced to be used so it's always written }
lab.increfs;
end;
result:=lab;
end;
constructor tasmreader.create;
begin
inherited create;
firsttoken:=true;
locallabels:=TFPHashObjectList.create;
end;
destructor tasmreader.destroy;
begin
locallabels.Free;
iasmops.Free;
inherited destroy;
end;
function tasmreader.createlocallabel(const s: string; var hl: tasmlabel; emit:boolean):boolean;
var
lab: TLocalLabel;
begin
result:=true;
{ Check if it already is defined }
lab:=TLocalLabel(locallabels.Find(s));
if not assigned(lab) then
lab:=TLocalLabel.Create(locallabels,s);
{ set emitted flag and check for dup syms }
if emit then
begin
if lab.Emitted then
begin
Message1(asmr_e_dup_local_sym,lab.Name);
result:=false;
end;
lab.Emitted:=true;
end;
hl:=lab.Gettasmlabel;
end;
procedure tasmreader.checklocallabels;
var
i: longint;
lab: TLocalLabel;
begin
for i:=0 to locallabels.Count-1 do
begin
lab:=TLocalLabel(locallabels[i]);
if not lab.emitted then
Message1(asmr_e_unknown_label_identifier,lab.name);
end;
locallabels.Clear;
end;
procedure tasmreader.checklocalsubscript(sym: tabstractnormalvarsym);
var
isimplicitpointer: boolean;
begin
isimplicitpointer:=
(sym.typ=paravarsym) and
(is_implicit_pointer_object_type(sym.vardef) or
paramanager.push_addr_param(sym.varspez,sym.vardef,current_procinfo.procdef.proccalloption));
{ sym.initiallloc/localloc is not yet initialised here }
{ pointer parameter to aggregate passed in register to pure assembler routine }
if (po_assembler in current_procinfo.procdef.procoptions) and
(sym.typ=paravarsym) and
(tparavarsym(sym).paraloc[calleeside].location^.loc=LOC_REGISTER) and
{ ... however this is only possible if the pointer takes only one register location }
not assigned(tparavarsym(sym).paraloc[calleeside].location^.Next) and
isimplicitpointer then
exit;
{ aggregate parameter passed on the stack to a pure assembler routine }
if (po_assembler in current_procinfo.procdef.procoptions) and
(sym.typ=paravarsym) and
{ sym.localloc is not yet initialised here for pure assembler routines }
(tparavarsym(sym).paraloc[calleeside].location^.loc in [LOC_REFERENCE,LOC_CREFERENCE]) and
not isimplicitpointer then
exit;
{ aggregate parameter located on the stack for a non-assembler routine
(locals accessed from assembler code are never kept in registers) }
if not(po_assembler in current_procinfo.procdef.procoptions) and
(sym.typ=paravarsym) and
not isimplicitpointer then
exit;
{ local aggregate located on the stack (locals accessed from assembler
code are never kept in registers) }
if ((sym.typ=localvarsym) or
{ even if a parameter is passed by reference, it will be copied to
a local if it's a value parameter to a non assembler routines }
(not(po_assembler in current_procinfo.procdef.procoptions) and
(sym.typ=paravarsym) and
(sym.varspez=vs_value))) and
not is_implicit_pointer_object_type(sym.vardef) then
exit;
Message(asmr_e_cannot_access_field_directly_for_parameters);
end;
end.
|
