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authoryexo <yexo@openttd.org>2009-07-15 19:47:06 +0000
committeryexo <yexo@openttd.org>2009-07-15 19:47:06 +0000
commitf085d7775b12e77b8012ab09ae72b850367a3237 (patch)
treedcc6b0bf106aff0538a996a369c0d213834e462f /src/ai
parent91a6af688e0f99017dd824de6b0f1f18dbc6ef50 (diff)
downloadopenttd-f085d7775b12e77b8012ab09ae72b850367a3237.tar.xz
(svn r16834) -Fix [FS#3034]: call the AI Save() function only once so AIs can't crash OpenTTD
Diffstat (limited to 'src/ai')
-rw-r--r--src/ai/ai_instance.cpp45
-rw-r--r--src/ai/ai_instance.hpp1
2 files changed, 22 insertions, 24 deletions
diff --git a/src/ai/ai_instance.cpp b/src/ai/ai_instance.cpp
index 8dff24f78..4566e925d 100644
--- a/src/ai/ai_instance.cpp
+++ b/src/ai/ai_instance.cpp
@@ -101,6 +101,7 @@ AIInstance::AIInstance(AIInfo *info) :
instance(NULL),
is_started(false),
is_dead(false),
+ is_save_data_on_stack(false),
suspend(0),
callback(NULL)
{
@@ -138,10 +139,6 @@ AIInstance::AIInstance(AIInfo *info) :
/* Register the API functions and classes */
this->RegisterAPI();
-
- /* The topmost stack item is true if there is data from a savegame
- * and false otherwise. */
- sq_pushbool(this->engine->vm, false);
}
AIInstance::~AIInstance()
@@ -288,6 +285,10 @@ void AIInstance::GameLoop()
/* If there is a callback to call, call that first */
if (this->callback != NULL) {
+ if (this->is_save_data_on_stack) {
+ sq_poptop(this->engine->GetVM());
+ this->is_save_data_on_stack = false;
+ }
try {
this->callback(this);
} catch (AI_VMSuspend e) {
@@ -328,6 +329,10 @@ void AIInstance::GameLoop()
this->is_started = true;
return;
}
+ if (this->is_save_data_on_stack) {
+ sq_poptop(this->engine->GetVM());
+ this->is_save_data_on_stack = false;
+ }
/* Continue the VM */
try {
@@ -546,20 +551,14 @@ void AIInstance::Save()
}
HSQUIRRELVM vm = this->engine->GetVM();
- if (!this->is_started) {
- SQBool res;
- sq_getbool(vm, -1, &res);
- if (!res) {
- SaveEmpty();
- return;
- }
- /* Push the loaded savegame data to the top of the stack. */
- sq_push(vm, -2);
+ if (this->is_save_data_on_stack) {
_ai_sl_byte = 1;
SlObject(NULL, _ai_byte);
/* Save the data that was just loaded. */
SaveObject(vm, -1, AISAVE_MAX_DEPTH, false);
- sq_poptop(vm);
+ } else if (!this->is_started) {
+ SaveEmpty();
+ return;
} else if (this->engine->MethodExists(*this->instance, "Save")) {
HSQOBJECT savedata;
/* We don't want to be interrupted during the save function. */
@@ -576,6 +575,7 @@ void AIInstance::Save()
if (!sq_istable(savedata)) {
AILog::Error("Save function should return a table.");
SaveEmpty();
+ this->engine->CrashOccurred();
return;
}
sq_pushobject(vm, savedata);
@@ -583,11 +583,11 @@ void AIInstance::Save()
_ai_sl_byte = 1;
SlObject(NULL, _ai_byte);
SaveObject(vm, -1, AISAVE_MAX_DEPTH, false);
+ this->is_save_data_on_stack = true;
} else {
- _ai_sl_byte = 0;
- SlObject(NULL, _ai_byte);
+ SaveEmpty();
+ this->engine->CrashOccurred();
}
- sq_pop(vm, 1);
} else {
AILog::Warning("Save function is not implemented");
_ai_sl_byte = 0;
@@ -674,21 +674,18 @@ void AIInstance::Load(int version)
/* Check if there was anything saved at all. */
if (_ai_sl_byte == 0) return;
- /* First remove the value "false" since we have data to load. */
- sq_poptop(vm);
sq_pushinteger(vm, version);
LoadObjects(vm);
- sq_pushbool(vm, true);
+ this->is_save_data_on_stack = true;
}
bool AIInstance::CallLoad()
{
HSQUIRRELVM vm = this->engine->GetVM();
/* Is there save data that we should load? */
- SQBool res;
- sq_getbool(vm, -1, &res);
- sq_poptop(vm);
- if (!res) return true;
+ if (!this->is_save_data_on_stack) return true;
+ /* Whatever happens, after CallLoad the savegame data is removed from the stack. */
+ this->is_save_data_on_stack = false;
if (!this->engine->MethodExists(*this->instance, "Load")) {
AILog::Warning("Loading failed: there was data for the AI to load, but the AI does not have a Load() function.");
diff --git a/src/ai/ai_instance.hpp b/src/ai/ai_instance.hpp
index 2730e9bd9..4c9cb69a5 100644
--- a/src/ai/ai_instance.hpp
+++ b/src/ai/ai_instance.hpp
@@ -123,6 +123,7 @@ private:
bool is_started;
bool is_dead;
+ bool is_save_data_on_stack;
int suspend;
AISuspendCallbackProc *callback;