Add resume command, finder function, arg parser, execute

include/vm_debug.h

@@ -1,24 +1,8 @@
 #ifndef _VM_DEBUG_H_
 #define _VM_DEBUG_H_
 
-typedef struct {
-    /*
-     * Most commands that need an argument will simply use addr1, but a
-     * few have more than one address--hence addr2.
-     */
-    int addr1;
-    int addr2;
-
-    /*
-     * If we have a thing we want to work with, but want to leave what
-     * that is up to the helper func, then you can write it into the
-     * target.
-     *
-     * If a command uses target, followed by an address, that address
-     * will be in addr1.
-     */
-    char target[256];
-} vm_debug_args;
+struct vm_debug_args;
+typedef struct vm_debug_args vm_debug_args;
 
 typedef void (*vm_debug_func)(vm_debug_args *);
 
@@ -52,9 +36,38 @@ typedef struct {
     char *desc;
 } vm_debug_cmd;
 
+struct vm_debug_args {
+    /*
+     * Most commands that need an argument will simply use addr1, but a
+     * few have more than one address--hence addr2.
+     */
+    int addr1;
+    int addr2;
+
+    /*
+     * If we have a thing we want to work with, but want to leave what
+     * that is up to the helper func, then you can write it into the
+     * target.
+     *
+     * If a command uses target, followed by an address, that address
+     * will be in addr1.
+     */
+    char *target;
+
+    /*
+     * The command our arguments are attached to; from here we can call
+     * the handler with ourselves. (Very meta.)
+     */
+    vm_debug_cmd *cmd;
+};
+
 #define DEBUG_CMD(x) \
     void vm_debug_cmd_##x (vm_debug_args *args)
 
+extern vm_debug_cmd *vm_debug_find_cmd(const char *);
+extern void vm_debug_execute(const char *);
+
 extern DEBUG_CMD(help);
+extern DEBUG_CMD(resume);
 
 #endif

src/vm_debug.c

@@ -2,18 +2,149 @@
  * vm_debug.c
  */
 
+#include <errno.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
 
 #include "vm_debug.h"
 #include "vm_di.h"
+#include "vm_reflect.h"
 
 vm_debug_cmd cmdtable[] = {
     { "help", "h", 0, vm_debug_cmd_help, "",
         "Print out this list of commands", },
+    { "resume", "r", 0, vm_debug_cmd_resume, "",
+        "Resume execution", },
 };
 
 #define CMDTABLE_SIZE (sizeof(cmdtable) / sizeof(vm_debug_cmd))
 
+char *
+vm_debug_next_arg(char **str)
+{
+    char *tok;
+
+    while ((tok = strsep(str, " "))) {
+        if (tok == NULL) {
+            return NULL;
+        }
+
+        if (*tok == '\0') {
+            continue;
+        }
+
+        break;
+    }
+
+    return tok;
+}
+
+int
+vm_debug_addr(const char *str)
+{
+    int addr;
+
+    if (str == NULL) {
+        return -1;
+    }
+
+    addr = strtol(str, NULL, 16);
+    if (addr == 0 && errno == EINVAL) {
+        return -1;
+    }
+
+    return addr;
+}
+
+void
+vm_debug_execute(const char *str)
+{
+    char *tok, *ebuf;
+    vm_debug_cmd *cmd;
+    vm_debug_args args;
+
+    ebuf = strdup(str);
+    cmd = NULL;
+
+    tok = vm_debug_next_arg(&ebuf);
+
+    // No input
+    if (tok == NULL) {
+        return;
+    }
+
+    cmd = vm_debug_find_cmd(tok);
+
+    // No command found
+    if (cmd == NULL) {
+        return;
+    }
+
+    args.addr1 = 0;
+    args.addr2 = 0;
+    args.target = NULL;
+
+    switch (cmd->nargs) {
+        case 2:
+            args.target = vm_debug_next_arg(&ebuf);
+
+            // This _may_ be -1 if we have a string target for argument
+            // 1, as in the writestate command
+            args.addr1 = vm_debug_addr(args.target);
+
+            args.addr2 = vm_debug_addr(vm_debug_next_arg(&ebuf));
+
+            // But if this is -1, then something went wrong
+            if (args.addr2 == -1) {
+                return;
+            }
+
+            break;
+
+        case 1:
+            args.addr1 = vm_debug_addr(vm_debug_next_arg(&ebuf));
+
+            // Oh no
+            if (args.addr1 == -1) {
+                return;
+            }
+
+            break;
+
+        case 0:
+        default:
+            break;
+    }
+
+    cmd->handler(&args);
+}
+
+static int
+cmd_compar(const void *k, const void *elem)
+{
+    const char *key = (const char *)k;
+    const vm_debug_cmd *cmd = (const vm_debug_cmd *)elem;
+
+    if (strlen(key) < 3) {
+        return strcmp(key, cmd->abbrev);
+    }
+
+    return strcmp(key, cmd->name);
+}
+
+/*
+ * Return the cmd struct for a command that matches str, which can
+ * either be an abbreviation (if 1 or 2 characters) or a full name (if
+ * otherwise). If no matching cmd can be found, return NULL.
+ */
+vm_debug_cmd *
+vm_debug_find_cmd(const char *str)
+{
+    return (vm_debug_cmd *)bsearch(str, &cmdtable, CMDTABLE_SIZE,
+                                   sizeof(vm_debug_cmd), cmd_compar);
+}
+
 DEBUG_CMD(help)
 {
     FILE *stream = (FILE *)vm_di_get(VM_OUTPUT);
@@ -25,3 +156,8 @@ DEBUG_CMD(help)
                 cmd->argdesc, cmd->desc);
     }
 }
+
+DEBUG_CMD(resume)
+{
+    vm_reflect_pause(NULL);
+}

tests/vm_debug.c

@@ -2,13 +2,20 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+
+#include "apple2.h"
+#include "apple2.reflect.h"
 #include "vm_debug.h"
 #include "vm_di.h"
+#include "vm_reflect.h"
 
 static char buf[BUFSIZ];
 static FILE *stream = NULL;
 static vm_debug_args args;
 
+static apple2 *mach;
+static vm_reflect *ref;
+
 static void
 setup()
 {
@@ -24,6 +31,15 @@ setup()
 
     // Writing to stream will now write to buf
     setvbuf(stream, buf, _IOFBF, BUFSIZ);
+
+    ref = vm_reflect_create();
+    vm_di_set(VM_REFLECT, ref);
+
+    mach = apple2_create(100, 100);
+    vm_di_set(VM_MACHINE, mach);
+    vm_di_set(VM_CPU, mach->cpu);
+
+    apple2_reflect_init();
 }
 
 static void
@@ -31,6 +47,8 @@ teardown()
 {
     memset(buf, 0, BUFSIZ);
     fclose(stream);
+
+    apple2_free(mach);
 }
 
 TestSuite(vm_debug, .init = setup, .fini = teardown);
@@ -43,5 +61,36 @@ Test(vm_debug, cmd_help)
 {
     vm_debug_cmd_help(&args);
     cr_assert_neq(strlen(buf), 0);
-    printf("%s", buf);
+}
+
+Test(vm_debug, execute)
+{
+    vm_debug_execute("help");
+    cr_assert_neq(strlen(buf), 0);
+}
+
+Test(vm_debug, find_cmd)
+{
+    vm_debug_cmd *cmd;
+
+    // Can we find anything?
+    cr_assert_neq(vm_debug_find_cmd("resume"), NULL);
+
+    // Make sure NULL is returned for bad commands
+    cr_assert_eq(vm_debug_find_cmd("THIS_DOESNT_EXIST"), NULL);
+
+    // Find a second command...
+    cmd = vm_debug_find_cmd("help");
+    cr_assert_neq(cmd, NULL);
+
+    // and see if we can find the short version
+    cr_assert_eq(vm_debug_find_cmd("h"), cmd);
+}
+
+Test(vm_debug, cmd_resume)
+{
+    mach->paused = true;
+    vm_debug_cmd_resume(&args);
+
+    cr_assert_eq(mach->paused, false);
 }