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
|
unit FpDbgDwarfFreePascal;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, FpDbgDwarfDataClasses, FpDbgDwarf, FpDbgInfo, FpDbgUtil, DbgIntfBaseTypes,
LazLoggerBase;
type
{ TFpDwarfFreePascalSymbolClassMap }
TFpDwarfFreePascalSymbolClassMap = class(TFpDwarfDefaultSymbolClassMap)
public
class function HandleCompUnit(ACU: TDwarfCompilationUnit): Boolean; override;
//class function GetDwarfSymbolClass(ATag: Cardinal): TDbgDwarfSymbolBaseClass; override;
class function CreateContext(AThreadId, AStackFrame: Integer; AnAddress: TDBGPtr; ASymbol: TFpDbgSymbol;
ADwarf: TFpDwarfInfo): TFpDbgInfoContext; override;
//class function CreateProcSymbol(ACompilationUnit: TDwarfCompilationUnit;
// AInfo: PDwarfAddressInfo; AAddress: TDbgPtr): TDbgDwarfSymbolBase; override;
end;
{ TFpDwarfFreePascalAddressContext }
TFpDwarfFreePascalAddressContext = class(TFpDwarfInfoAddressContext)
private
FOuterNestContext: TFpDbgInfoContext;
FOuterNotFound: Boolean;
protected
function FindLocalSymbol(const AName: String; PNameUpper, PNameLower: PChar;
InfoEntry: TDwarfInformationEntry; out ADbgValue: TFpDbgValue): Boolean; override;
public
destructor Destroy; override;
end;
implementation
{ TFpDwarfFreePascalSymbolClassMap }
class function TFpDwarfFreePascalSymbolClassMap.HandleCompUnit(ACU: TDwarfCompilationUnit): Boolean;
var
s: String;
begin
s := LowerCase(ACU.Producer);
Result := pos('free pascal', s) > 0;
end;
class function TFpDwarfFreePascalSymbolClassMap.CreateContext(AThreadId, AStackFrame: Integer;
AnAddress: TDBGPtr; ASymbol: TFpDbgSymbol; ADwarf: TFpDwarfInfo): TFpDbgInfoContext;
begin
Result := TFpDwarfFreePascalAddressContext.Create(AThreadId, AStackFrame, AnAddress, ASymbol, ADwarf);
end;
{ TFpDwarfFreePascalAddressContext }
function TFpDwarfFreePascalAddressContext.FindLocalSymbol(const AName: String; PNameUpper,
PNameLower: PChar; InfoEntry: TDwarfInformationEntry; out ADbgValue: TFpDbgValue): Boolean;
const
parentfp: string = 'parentfp';
parentfp2: string = '$parentfp';
selfname: string = 'self';
// TODO: get reg num via memreader name-to-num
{$IFDEF cpu64}
RegFp = 6;
RegPc = 16;
{$ELSE}
RegFp = 5;
RegPc = 8;
{$ENDIF}
var
StartScopeIdx: Integer;
ParentFpVal: TFpDbgValue;
SearchCtx: TFpDwarfFreePascalAddressContext;
par_fp, cur_fp, prev_fp, pc: TDbgPtr;
d, i: Integer;
ParentFpSym: TFpDwarfSymbol;
begin
Result := False;
if (Length(AName) = length(selfname)) and (CompareUtf8BothCase(PNameUpper, PNameLower, @selfname[1])) then begin
ADbgValue := GetSelfParameter;
if ADbgValue <> nil then begin
AddRefToVal(ADbgValue);
Result := True;
exit;
end;
end;
StartScopeIdx := InfoEntry.ScopeIndex;
Result := inherited FindLocalSymbol(AName, PNameUpper, PNameLower, InfoEntry, ADbgValue);
if Result then
exit;
if FOuterNotFound then
exit;
if FOuterNestContext <> nil then begin
ADbgValue := FOuterNestContext.FindSymbol(AName); // TODO: pass upper/lower
if ADbgValue <> nil then
AddRefToVal(ADbgValue);
Result := True; // self, global was done by outer
exit;
end;
InfoEntry.ScopeIndex := StartScopeIdx;
if not InfoEntry.GoNamedChildEx(@parentfp[1], @parentfp[1]) then begin
InfoEntry.ScopeIndex := StartScopeIdx;
if not InfoEntry.GoNamedChildEx(@parentfp2[1], @parentfp2[1]) then begin
FOuterNotFound := True;
exit;
end;
end;
ParentFpSym := TFpDwarfSymbol.CreateSubClass(AName, InfoEntry);
ParentFpVal := ParentFpSym.Value;
ApplyContext(ParentFpVal);
//TFpDwarfSymbol(ADbgValue.DbgSymbol).ParentTypeInfo := TFpDwarfSymbolValueProc(FSymbol);
if not (svfOrdinal in ParentFpVal.FieldFlags) then begin
DebugLn('no ordinal for parentfp');
ParentFpSym.ReleaseReference;
FOuterNotFound := True;
exit;
end;
par_fp := ParentFpVal.AsCardinal;
ParentFpSym.ReleaseReference;
DebugLn(['par_fp=',par_fp]);
if par_fp = 0 then begin
DebugLn('no ordinal for parentfp');
FOuterNotFound := True;
exit;
end;
i := StackFrame + 1;
SearchCtx := TFpDwarfFreePascalAddressContext.Create(ThreadId, i, 0, Symbol, Dwarf);
cur_fp := 0;
if MemManager.ReadRegister(RegFp, cur_fp, Self) then begin
if cur_fp > par_fp then
d := -1 // cur_fp must go down
else
d := 1; // cur_fp must go up
while not (cur_fp = par_fp) do begin
SearchCtx.StackFrame := i;
// TODO: get reg num via memreader name-to-num
prev_fp := cur_fp;
if not MemManager.ReadRegister(RegFp, cur_fp, SearchCtx) then
break;
inc(i);
if (cur_fp = prev_fp) or ((cur_fp < prev_fp) xor (d = -1)) then
break; // wrong direction
if i > StackFrame + 200 then break; // something wrong? // TODO better check
end;
dec(i);
end;
if (par_fp <> cur_fp) or (cur_fp = 0) or
not MemManager.ReadRegister(RegPc, pc, SearchCtx)
then begin
FOuterNotFound := True;
SearchCtx.ReleaseReference;
exit;
end;
SearchCtx.ReleaseReference;
FOuterNestContext := Dwarf.FindContext(ThreadId, i, pc);
ADbgValue := FOuterNestContext.FindSymbol(AName); // TODO: pass upper/lower
if ADbgValue <> nil then
AddRefToVal(ADbgValue);
Result := True; // self, global was done by outer
end;
destructor TFpDwarfFreePascalAddressContext.Destroy;
begin
FOuterNestContext.ReleaseReference;
inherited Destroy;
end;
initialization
DwarfSymbolClassMapList.AddMap(TFpDwarfFreePascalSymbolClassMap);
end.
|
