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dmnt-cheat: Support nested conditionals in VM
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8c86074da2
commit
853a57e4d4
@ -204,6 +204,17 @@ bool DmntCheatVm::DecodeNextOpcode(CheatVmOpcode *out) {
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opcode.opcode = (CheatVmOpcodeType)((((u32)opcode.opcode) << 4) | ((first_dword >> 24) & 0xF));
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}
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/* detect condition start. */
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switch (opcode.opcode) {
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case CheatVmOpcodeType_BeginConditionalBlock:
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case CheatVmOpcodeType_BeginKeypressConditionalBlock:
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opcode.begin_conditional_block = true;
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break;
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default:
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opcode.begin_conditional_block = false;
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break;
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}
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switch (opcode.opcode) {
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case CheatVmOpcodeType_StoreStatic:
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{
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@ -357,16 +368,32 @@ bool DmntCheatVm::DecodeNextOpcode(CheatVmOpcode *out) {
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}
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void DmntCheatVm::SkipConditionalBlock() {
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CheatVmOpcode skip_opcode;
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while (this->DecodeNextOpcode(&skip_opcode)) {
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/* Decode instructions until we see end of conditional block. */
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/* NOTE: This is broken in gateway's implementation. */
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/* Gateway currently checks for "0x2" instead of "0x20000000" */
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/* In addition, they do a linear scan instead of correctly decoding opcodes. */
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/* This causes issues if "0x2" appears as an immediate in the conditional block... */
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if (skip_opcode.opcode == CheatVmOpcodeType_EndConditionalBlock) {
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break;
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if (this->condition_depth > 0) {
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/* We want to continue until we're out of the current block. */
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size_t desired_depth = this->condition_depth - 1;
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CheatVmOpcode skip_opcode;
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while (this->DecodeNextOpcode(&skip_opcode) && this->condition_depth > desired_depth) {
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/* Decode instructions until we see end of the current conditional block. */
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/* NOTE: This is broken in gateway's implementation. */
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/* Gateway currently checks for "0x2" instead of "0x20000000" */
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/* In addition, they do a linear scan instead of correctly decoding opcodes. */
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/* This causes issues if "0x2" appears as an immediate in the conditional block... */
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/* We also support nesting of conditional blocks, and Gateway does not. */
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if (skip_opcode.begin_conditional_block) {
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this->condition_depth++;
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} else if (skip_opcode.opcode == CheatVmOpcodeType_EndConditionalBlock) {
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this->condition_depth--;
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}
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}
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} else {
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/* Skipping, but this->condition_depth = 0. */
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/* This is an error condition. */
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/* However, I don't actually believe it is possible for this to happen. */
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/* I guess we'll throw a fatal error here, so as to encourage me to fix the VM */
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/* in the event that someone triggers it? I don't know how you'd do that. */
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fatalSimple(ResultDmntCheatVmInvalidCondDepth);
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}
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}
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@ -402,6 +429,7 @@ void DmntCheatVm::ResetState() {
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this->loop_tops[i] = 0;
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}
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this->instruction_ptr = 0;
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this->condition_depth = 0;
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this->decode_success = true;
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}
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@ -452,6 +480,11 @@ void DmntCheatVm::Execute(const CheatProcessMetadata *metadata) {
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}
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this->LogOpcode(&cur_opcode);
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/* Increment conditional depth, if relevant. */
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if (cur_opcode.begin_conditional_block) {
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this->condition_depth++;
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}
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switch (cur_opcode.opcode) {
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case CheatVmOpcodeType_StoreStatic:
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{
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@ -511,7 +544,11 @@ void DmntCheatVm::Execute(const CheatProcessMetadata *metadata) {
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}
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break;
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case CheatVmOpcodeType_EndConditionalBlock:
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/* There is nothing to do here. Just move on to the next instruction. */
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/* Decrement the condition depth. */
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/* We will assume, graciously, that mismatched conditional block ends are a nop. */
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if (this->condition_depth > 0) {
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this->condition_depth--;
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}
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break;
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case CheatVmOpcodeType_ControlLoop:
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if (cur_opcode.ctrl_loop.start_loop) {
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@ -164,6 +164,7 @@ struct StoreRegisterToAddressOpcode {
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struct CheatVmOpcode {
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CheatVmOpcodeType opcode;
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bool begin_conditional_block;
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union {
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StoreStaticOpcode store_static;
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BeginConditionalOpcode begin_cond;
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@ -186,6 +187,7 @@ class DmntCheatVm {
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private:
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size_t num_opcodes = 0;
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size_t instruction_ptr = 0;
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size_t condition_depth = 0;
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bool decode_success = false;
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u32 program[MaximumProgramOpcodeCount] = {0};
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u64 registers[NumRegisters] = {0};
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@ -33,4 +33,6 @@ static constexpr Result ResultDmntCheatInvalidCheat = MAKERESULT(Module_Dmnt, 6
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static constexpr Result ResultDmntCheatInvalidFreezeWidth = MAKERESULT(Module_Dmnt, 6600);
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static constexpr Result ResultDmntCheatAddressAlreadyFrozen = MAKERESULT(Module_Dmnt, 6601);
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static constexpr Result ResultDmntCheatAddressNotFrozen = MAKERESULT(Module_Dmnt, 6602);
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static constexpr Result ResultDmntCheatTooManyFrozenAddresses = MAKERESULT(Module_Dmnt, 6603);
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static constexpr Result ResultDmntCheatTooManyFrozenAddresses = MAKERESULT(Module_Dmnt, 6603);
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static constexpr Result ResultDmntCheatVmInvalidCondDepth = MAKERESULT(Module_Dmnt, 6700);
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