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added basic functionalities to the debugger mode

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This commit is contained in:
cozis
2021-11-02 09:17:03 +00:00
parent 7e04b0fc6d
commit 022610bb71
7 changed files with 267 additions and 22 deletions
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src/debug.c
+217 -19
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@@ -1,9 +1,12 @@
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <limits.h>
#include <errno.h>
#include <stdio.h>
#include <ctype.h>
#include "debug.h"
#include "utils/defs.h"
#define ANSI_COLOR_RED "\x1b[31m"
#define ANSI_COLOR_GREEN "\x1b[32m"
@@ -13,13 +16,26 @@
#define ANSI_COLOR_CYAN "\x1b[36m"
#define ANSI_COLOR_RESET "\x1b[0m"
typedef struct {
char *name;
typedef enum {
BY_LINE,
BY_INDEX,
BY_OFFSET,
} BreakPointMode;
typedef struct {
BreakPointMode mode;
char *name;
union {
int line;
int index;
int offset;
};
} BreakPoint;
struct xDebug {
_Bool continuing;
BreakPoint bpoints[32];
int bpoints_count;
};
Debug *Debug_New()
@@ -29,7 +45,8 @@ Debug *Debug_New()
if(dbg == NULL)
return NULL;
// Do stuff here.
dbg->continuing = 0;
dbg->bpoints_count = 0;
return dbg;
}
@@ -37,7 +54,11 @@ Debug *Debug_New()
void Debug_Free(Debug *dbg)
{
if(dbg)
free(dbg);
{
for(int i = 0; i < dbg->bpoints_count; i += 1)
free(dbg->bpoints[i].name);
free(dbg);
}
}
_Bool Debug_Callback(Runtime *runtime, void *userp)
@@ -47,29 +68,125 @@ _Bool Debug_Callback(Runtime *runtime, void *userp)
Debug *dbg = (Debug*) userp;
char buffer[256];
int length;
const char *name = NULL;
int line = -1;
int index = -1;
int offset = -1;
int length = -1;
{
Executable *exe = Runtime_GetCurrentExecutable(runtime);
assert(exe != NULL);
index = Runtime_GetCurrentIndex(runtime);
assert(index >= 0);
Source *src = Executable_GetSource(exe);
if(src != NULL)
{
// Executable has source information.
offset = Executable_GetInstrOffset(exe, index);
assert(offset >= 0);
length = Executable_GetInstrLength(exe, index);
assert(length >= 0);
name = Source_GetName(src);
const char *body = Source_GetBody(src);
assert(body != NULL);
line = 1;
int i = 0;
while(i < offset)
{
if(body[i] == '\n')
line += 1;
i += 1;
}
assert(line > 0);
}
}
// Check if we reached a breakpoint.
_Bool hit = 0;
int idx;
for(int i = 0; i < dbg->bpoints_count && hit == 0; i += 1)
{
if(!strcmp(dbg->bpoints[i].name, name))
{
switch(dbg->bpoints[i].mode)
{
case BY_LINE:
if(dbg->bpoints[i].line == line)
hit = 1;
break;
case BY_INDEX:
if(dbg->bpoints[i].index == index)
hit = 1;
break;
case BY_OFFSET:
if(dbg->bpoints[i].offset >= offset && dbg->bpoints[i].offset < offset + length)
hit = 1;
break;
}
if(hit)
idx = i;
}
}
if(hit)
{
fprintf(stderr, "Hit breakpoint %d\n", idx);
dbg->continuing = 0;
}
else
{
if(dbg->continuing)
return 1;
}
char buffer[256];
int buflen;
int argc;
char *argv[32];
int argc;
do {
fprintf(stderr, ANSI_COLOR_GREEN "> " ANSI_COLOR_RESET);
if(name == NULL && line == -1)
fprintf(stderr, "(unnamed)" ANSI_COLOR_GREEN " > " ANSI_COLOR_RESET);
else if(name == NULL && line > -1)
fprintf(stderr, "(unnamed):%d" ANSI_COLOR_GREEN " > " ANSI_COLOR_RESET, line);
else if(name != NULL && line == -1)
fprintf(stderr, "%s" ANSI_COLOR_GREEN " > " ANSI_COLOR_RESET, name);
else if(name != NULL && line > -1)
fprintf(stderr, "%s:%d" ANSI_COLOR_GREEN " > " ANSI_COLOR_RESET, name, line);
{
length = 0;
buflen = 0;
char c;
while((c = getc(stdin)) != '\n')
{
if(length < (int) sizeof(buffer)-1)
buffer[length] = c;
if(buflen < (int) sizeof(buffer)-1)
buffer[buflen] = c;
length += 1;
buflen += 1;
}
if(length > (int) sizeof(buffer)-1)
if(buflen > (int) sizeof(buffer)-1)
{
fprintf(stdout,
"Command is too long. The internal buffer can only contain %ld bytes.\n"
@@ -78,7 +195,7 @@ _Bool Debug_Callback(Runtime *runtime, void *userp)
continue;
}
buffer[length] = '\0';
buffer[buflen] = '\0';
}
// Now split the buffer into words in the (argc, argv) style.
@@ -229,15 +346,95 @@ _Bool Debug_Callback(Runtime *runtime, void *userp)
}
else if(!strcmp(argv[0], "breakpoint"))
{
fprintf(stderr, "Not implemented yet.\n");
if(argc < 3)
{
fprintf(stderr, "\"breakpoint\" command expects 2 operands.\n");
continue;
}
int max_breakpoints = sizeof(dbg->bpoints) / sizeof(dbg->bpoints[0]);
if(dbg->bpoints_count == max_breakpoints)
{
fprintf(stderr, "Can't add a breakpoint. The maximum number of breakpoints (%d) was reached.\n", max_breakpoints);
}
else
{
// Handle second argument.
BreakPointMode mode;
if(!strcmp(argv[2], "line"))
{
mode = BY_LINE;
}
else if(!strcmp(argv[2], "index"))
{
mode = BY_INDEX;
}
else if(!strcmp(argv[2], "offset"))
{
mode = BY_OFFSET;
}
else
{
fprintf(stderr, "Bad second argument \"%s\". It must be either one of \"line\", \"index\", \"offset\".\n", argv[2]);
continue;
}
// Handle third argument.
long long int N = strtoll(argv[3], NULL, 10);
if(errno == ERANGE)
{
if(N == LLONG_MIN)
{
fprintf(stderr, "Bad third argument. Integer is too big.\n");
}
else
{
assert(N == LLONG_MAX);
fprintf(stderr, "Bad third argument. Integer is too big.\n");
}
continue;
}
else if(errno != 0)
{
fprintf(stderr, "Bad third argument. (strtoll says: %s).\n", strerror(errno));
continue;
}
// Handle first argument.
char *name_copy = malloc(strlen(argv[1])+1);
if(name_copy == NULL)
{
fprintf(stderr, "Uoops! No memory!");
continue;
}
strcpy(name_copy, argv[1]);
dbg->bpoints[dbg->bpoints_count] = (BreakPoint) {
.mode = mode,
.name = name_copy,
.line = N,
};
dbg->bpoints_count += 1;
fprintf(stderr, "BreakPoint added.\n");
}
}
else if(!strcmp(argv[0], "continue"))
{
fprintf(stderr, "Not implemented yet.\n");
dbg->continuing = 1;
return 1;
}
else if(!strcmp(argv[0], "step"))
{
break;
return 1;
}
else if(!strcmp(argv[0], "quit"))
{
@@ -251,5 +448,6 @@ _Bool Debug_Callback(Runtime *runtime, void *userp)
} while(1);
return 1;
UNREACHABLE;
return 0;
}