From 7f1994c7aa1e3f18bc8baf7cb37f9fe093c884eb Mon Sep 17 00:00:00 2001 From: Aryadev Chavali Date: Sun, 22 Oct 2023 20:57:29 +0100 Subject: Added and implemented OP_JUMP_(STACK|REGISTER) Uses the stack and register, respectively, to jump to an absolute address. The stack based jump pops a word off the stack to perform a jump, while the register based one uses the operand to figure out which register to use. --- src/runtime.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) (limited to 'src/runtime.c') diff --git a/src/runtime.c b/src/runtime.c index 6b708ee..e68dd25 100644 --- a/src/runtime.c +++ b/src/runtime.c @@ -19,7 +19,7 @@ void vm_execute(vm_t *vm) { - static_assert(NUMBER_OF_OPCODES == 32, "vm_execute: Out of date"); + static_assert(NUMBER_OF_OPCODES == 34, "vm_execute: Out of date"); struct Program *prog = &vm->program; if (prog->ptr >= prog->max) // TODO: Error (Went past end of program) @@ -96,6 +96,18 @@ void vm_execute(vm_t *vm) // Set prog->ptr to the jump point requested prog->ptr = instruction.operand.as_word; } + else if (instruction.opcode == OP_JUMP_STACK) + { + // Set prog->ptr to the word on top of the stack + prog->ptr = vm_pop_word(vm).as_word; + } + else if (instruction.opcode == OP_JUMP_REGISTER) + { + if (instruction.operand.as_byte >= 8) + // TODO: Error register is not a valid word register + return; + prog->ptr = vm->registers.reg[instruction.operand.as_byte]; + } else if (instruction.opcode == OP_HALT) { // Do nothing here. Should be caught by callers of vm_execute -- cgit v1.2.3-13-gbd6f