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Validate type of all instructions, log validation failures at load.

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The validator now checks that the type of conditional instructions
is known.
On a validation failure, the load code now outputs a corrupt savegame
message, with the validation error message and a program dump,
instead of using an assertion.
This commit is contained in:
Jonathan G Rennison
2015-09-02 20:51:30 +01:00
parent d9acfc4599
commit 73b69c5594
2 changed files with 34 additions and 3 deletions
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18
src/saveload/tracerestrict_sl.cpp
View File

@@ -11,9 +11,10 @@
#include "../stdafx.h"
#include "../tracerestrict.h"
#include "../strings_func.h"
#include "../string_func.h"
#include "saveload.h"
#include <vector>
#include "saveload.h"
static const SaveLoad _trace_restrict_mapping_desc[] = {
SLE_VAR(TraceRestrictMappingItem, program_id, SLE_UINT32),
@@ -66,7 +67,20 @@ static void Load_TRRP()
SlObject(&stub, _trace_restrict_program_stub_desc);
prog->items.resize(stub.length);
SlArray(&(prog->items[0]), stub.length, SLE_UINT32);
assert(prog->Validate().Succeeded());
CommandCost validation_result = prog->Validate();
if (validation_result.Failed()) {
char str[4096];
char *strend = str + seprintf(str, lastof(str), "Trace restrict program %d: %s\nProgram dump:",
index, GetStringPtr(validation_result.GetErrorMessage()));
for (unsigned int i = 0; i < prog->items.size(); i++) {
if (i % 3) {
strend += seprintf(strend, lastof(str), " %08X", prog->items[i]);
} else {
strend += seprintf(strend, lastof(str), "\n%4u: %08X", i, prog->items[i]);
}
}
SlErrorCorrupt(str);
}
}
}

19
src/tracerestrict.cpp
View File

@@ -414,7 +414,7 @@ void TraceRestrictProgram::DecrementRefCount() {
* Validate a instruction list
* Returns successful result if program seems OK
* This only validates that conditional nesting is correct,
* and that all non-conditionals have a known type, at present
* and that all instructions have a known type, at present
*/
CommandCost TraceRestrictProgram::Validate(const std::vector<TraceRestrictItem> &items, TraceRestrictProgramActionsUsedFlags &actions_used_flags) {
// static to avoid needing to re-alloc/resize on each execution
@@ -464,6 +464,23 @@ CommandCost TraceRestrictProgram::Validate(const std::vector<TraceRestrictItem>
}
HandleCondition(condstack, condflags, true);
}
switch (GetTraceRestrictType(item)) {
case TRIT_COND_ENDIF:
case TRIT_COND_UNDEFINED:
case TRIT_COND_TRAIN_LENGTH:
case TRIT_COND_MAX_SPEED:
case TRIT_COND_CURRENT_ORDER:
case TRIT_COND_NEXT_ORDER:
case TRIT_COND_LAST_STATION:
case TRIT_COND_CARGO:
case TRIT_COND_ENTRY_DIRECTION:
case TRIT_COND_PBS_ENTRY_SIGNAL:
break;
default:
return_cmd_error(STR_TRACE_RESTRICT_ERROR_VALIDATE_UNKNOWN_INSTRUCTION);
}
} else {
switch (GetTraceRestrictType(item)) {
case TRIT_PF_DENY: