aboutsummaryrefslogtreecommitdiffstats
path: root/code/tools/lcc/src/trace.c
blob: 3b9ba78c8e1470a67b13c87a55fb5672d846c1c8 (plain)
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
#include "c.h"


static char *fmt, *fp, *fmtend;	/* format string, current & limit pointer */
static Tree args;		/* printf arguments */
static Symbol frameno;		/* local holding frame number */

/* appendstr - append str to the evolving format string, expanding it if necessary */
static void appendstr(char *str) {
	do
		if (fp == fmtend) {
			if (fp) {
				char *s = allocate(2*(fmtend - fmt), FUNC);
				strncpy(s, fmt, fmtend - fmt);
				fp = s + (fmtend - fmt);
				fmtend = s + 2*(fmtend - fmt);
				fmt = s;
			} else {
				fp = fmt = allocate(80, FUNC);
				fmtend = fmt + 80;
			}
		}
	while ((*fp++ = *str++) != 0);
	fp--;
}

/* tracevalue - append format and argument to print the value of e */
static void tracevalue(Tree e, int lev) {
	Type ty = unqual(e->type);

	switch (ty->op) {
	case INT:
		if (ty == chartype || ty == signedchar)
			appendstr("'\\x%02x'");
		else if (ty == longtype)
			appendstr("0x%ld");
		else
			appendstr("0x%d");
		break;
	case UNSIGNED:
		if (ty == chartype || ty == unsignedchar)
			appendstr("'\\x%02x'");
		else if (ty == unsignedlong)
			appendstr("0x%lx");
		else
			appendstr("0x%x");
		break;
	case FLOAT:
		if (ty == longdouble)
			appendstr("%Lg");
		else
			appendstr("%g");
		break;
	case POINTER:
		if (unqual(ty->type) == chartype
		||  unqual(ty->type) == signedchar
		||  unqual(ty->type) == unsignedchar) {
			static Symbol null;
			if (null == NULL)
				null = mkstr("(null)");
			tracevalue(cast(e, unsignedtype), lev + 1);
			appendstr(" \"%.30s\"");
			e = condtree(e, e, pointer(idtree(null->u.c.loc)));
		} else {
			appendstr("("); appendstr(typestring(ty, "")); appendstr(")0x%x");
		}
		break;
	case STRUCT: {
		Field q;
		appendstr("("); appendstr(typestring(ty, "")); appendstr("){");
		for (q = ty->u.sym->u.s.flist; q; q = q->link) {
			appendstr(q->name); appendstr("=");
			tracevalue(field(addrof(e), q->name), lev + 1);
			if (q->link)
				appendstr(",");
		}
		appendstr("}");
		return;
		}
	case UNION:
		appendstr("("); appendstr(typestring(ty, "")); appendstr("){...}");
		return;
	case ARRAY:
		if (lev && ty->type->size > 0) {
			int i;
			e = pointer(e);
			appendstr("{");
			for (i = 0; i < ty->size/ty->type->size; i++) {
				Tree p = (*optree['+'])(ADD, e, consttree(i, inttype));
				if (isptr(p->type) && isarray(p->type->type))
					p = retype(p, p->type->type);
				else
					p = rvalue(p);
				if (i)
					appendstr(",");
				tracevalue(p, lev + 1);
			}
			appendstr("}");
		} else
			appendstr(typestring(ty, ""));
		return;
	default:
		assert(0);
	}
	e = cast(e, promote(ty));
	args = tree(mkop(ARG,e->type), e->type, e, args);
}

/* tracefinis - complete & generate the trace call to print */
static void tracefinis(Symbol printer) {
	Tree *ap;
	Symbol p;

	*fp = 0;
	p = mkstr(string(fmt));
	for (ap = &args; *ap; ap = &(*ap)->kids[1])
		;
	*ap = tree(ARG+P, charptype, pointer(idtree(p->u.c.loc)), 0);
	walk(calltree(pointer(idtree(printer)), freturn(printer->type), args, NULL), 0, 0);
	args = 0;
	fp = fmtend = 0;
}

/* tracecall - generate code to trace entry to f */
static void tracecall(Symbol printer, Symbol f) {
	int i;
	Symbol counter = genident(STATIC, inttype, GLOBAL);

	defglobal(counter, BSS);
	(*IR->space)(counter->type->size);
	frameno = genident(AUTO, inttype, level);
	addlocal(frameno);
	appendstr(f->name); appendstr("#");
	tracevalue(asgn(frameno, incr(INCR, idtree(counter), consttree(1, inttype))), 0);
	appendstr("(");
	for (i = 0; f->u.f.callee[i]; i++) {
		if (i)
			appendstr(",");
		appendstr(f->u.f.callee[i]->name); appendstr("=");
		tracevalue(idtree(f->u.f.callee[i]), 0);
	}
	if (variadic(f->type))
		appendstr(",...");
	appendstr(") called\n");
	tracefinis(printer);
}

/* tracereturn - generate code to trace return e */
static void tracereturn(Symbol printer, Symbol f, Tree e) {
	appendstr(f->name); appendstr("#");
	tracevalue(idtree(frameno), 0);
	appendstr(" returned");
	if (freturn(f->type) != voidtype && e) {
		appendstr(" ");
		tracevalue(e, 0);
	}
	appendstr("\n");
	tracefinis(printer);
}

/* trace_init - initialize for tracing */
void trace_init(int argc, char *argv[]) {
	int i;
	static int inited;

	if (inited)
		return;
	inited = 1;
	type_init(argc, argv);
	if (IR)
		for (i = 1; i < argc; i++)
			if (strncmp(argv[i], "-t", 2) == 0 &&  strchr(argv[i], '=') == NULL) {
				Symbol printer = mksymbol(EXTERN,
					argv[i][2] ? &argv[i][2] : "printf",
				ftype(inttype, ptr(qual(CONST, chartype))));
				printer->defined = 0;
				attach((Apply)tracecall,   printer, &events.entry);
				attach((Apply)tracereturn, printer, &events.returns);
				break;
			}
}