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fdc7e112c65f83bab77366fa76ab9d65dc0d33e7
Noja/src/debug.c
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484 lines
11 KiB
C
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#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"
#define ANSI_COLOR_YELLOW "\x1b[33m"
#define ANSI_COLOR_BLUE "\x1b[34m"
#define ANSI_COLOR_MAGENTA "\x1b[35m"
#define ANSI_COLOR_CYAN "\x1b[36m"
#define ANSI_COLOR_RESET "\x1b[0m"
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()
{
Debug *dbg = malloc(sizeof(Debug));
if(dbg == NULL)
return NULL;
dbg->continuing = 0;
dbg->bpoints_count = 0;
return dbg;
}
void Debug_Free(Debug *dbg)
{
if(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)
{
assert(runtime != NULL);
assert(userp != NULL);
Debug *dbg = (Debug*) userp;
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;
char *argv[32];
int argc;
do {
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);
{
buflen = 0;
char c;
while((c = getc(stdin)) != '\n')
{
if(buflen < (int) sizeof(buffer)-1)
buffer[buflen] = c;
buflen += 1;
}
if(buflen > (int) sizeof(buffer)-1)
{
fprintf(stdout,
"Command is too long. The internal buffer can only contain %ld bytes.\n"
"Try inserting another command.\n",
sizeof(buffer)-1);
continue;
}
buffer[buflen] = '\0';
}
// Now split the buffer into words in the (argc, argv) style.
{
argc = 0;
_Bool again = 0;
int curs = 0;
while(1)
{
// Skip whitespace.
while(isspace(buffer[curs]))
curs += 1;
if(buffer[curs] == '\0')
break;
int offset = curs;
while(!isspace(buffer[curs]) && buffer[curs] != '\0')
curs += 1;
int length = curs - offset;
assert(length > 0);
{
int max_argc = sizeof(argv) / sizeof(argv[0]);
if(argc == max_argc)
{
fprintf(stdout,
"Command has too many words. The internal buffer can only contain %d words.\n"
"Try inserting another command.\n",
max_argc);
again = 1;
break;
}
argv[argc++] = buffer + offset;
}
if(buffer[curs] == '\0')
break;
assert(isspace(buffer[curs]));
buffer[curs] = '\0';
curs += 1; // Consume the space that ended the word (not overwritten by a zero byte).
}
if(again)
continue;
}
if(argc == 0)
continue;
{
if(!strcmp(argv[0], "help"))
{
if(argc == 1)
{
fprintf(stderr,
"help .............. Show this message\n"
"help <command> .... Display additional information for a given command\n"
"step .............. Run an instruction\n"
"quit .............. Stop execution\n"
"continue .......... Run until a breakpoint or the end of the code is reached\n"
"breakpoint ........ Add a breakpoint\n"
"stack ............. Show the contents of the stack\n");
}
else if(!strcmp(argv[1], "help"))
{
fprintf(stderr,
"\n"
" Command | help\n"
" | \n"
" Usage | > help [<command>]\n"
" | \n"
" Description | List all available commands or show detailed \n"
" | information about a given command.\n"
"\n");
}
else if(!strcmp(argv[1], "step"))
{
fprintf(stderr,
"\n"
" Command | step\n"
" | \n"
" Usage | > step\n"
" | \n"
" Description | Run a single instruction.\n"
"\n");
}
else if(!strcmp(argv[1], "quit"))
{
fprintf(stderr,
"\n"
" Command | quit\n"
" | \n"
" Usage | > quit\n"
" | \n"
" Description | Stop the execution.\n"
"\n");
}
else if(!strcmp(argv[1], "continue"))
{
fprintf(stderr,
"\n"
" Command | continue\n"
" | \n"
" Usage | > continue\n"
" | \n"
" Description | Run until a breakpoint or the end of the code is\n"
" | reached.\n"
"\n");
}
else if(!strcmp(argv[1], "breakpoint"))
{
fprintf(stderr,
"\n"
" Command | breakpoint\n"
" | \n"
" Usage | > breakpoint <file> { line | offset | index } <N>\n"
" | \n"
" Description | Add a breakpoint. The first argument of the command \n"
" | specifies the source containing the breakpoint, while \n"
" | the second one specifies the way the breakpoint is \n"
" | expressed: \n"
" | \n"
" | line | by line number.\n"
" | | \n"
" | offset | by character offset.\n"
" | | \n"
" | index | by instruction index (relative to the \n"
" | | start of the source executable's body).\n"
" | \n"
" | the third argument is, based on the second one, either\n"
" | a line number, a character offset or an instruction index.\n"
"\n");
}
else if(!strcmp(argv[1], "stack"))
{
fprintf(stderr,
"\n"
" Command | stack\n"
" | \n"
" Usage | > stack\n"
" | \n"
" Description | Show the contents of the stack.\n"
"\n");
}
else
{
fprintf(stdout, "Unknown command \"%s\".\n", argv[1]);
}
}
else if(!strcmp(argv[0], "breakpoint"))
{
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"))
{
dbg->continuing = 1;
return 1;
}
else if(!strcmp(argv[0], "step"))
{
return 1;
}
else if(!strcmp(argv[0], "stack"))
{
Stack *stack = Runtime_GetStack(runtime);
assert(stack != NULL);
if(Stack_Size(stack) == 0)
fprintf(stderr, "The stack is empty.\n");
for(int i = 0; i < (int) Stack_Size(stack); i += 1)
{
Object *obj = Stack_Top(stack, -i);
assert(obj != NULL);
fprintf(stderr, " %d | ", i);
Object_Print(obj, stderr);
fprintf(stderr, "\n");
}
}
else if(!strcmp(argv[0], "quit"))
{
return 0;
}
else
{
fprintf(stdout, "Unknown command \"%s\". Type \"help\" is you need help.\n", argv[0]);
}
}
} while(1);
UNREACHABLE;
return 0;
}
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