From 86977fe3c140e6b5d6c09bc1d26d9f97d89a6488 Mon Sep 17 00:00:00 2001 From: Aryadev Chavali Date: Thu, 2 Nov 2023 21:01:21 +0000 Subject: Introduced instructions to engage with a call stack Essentially you may "call" an absolute program address, which pushes the current address onto the call stack. CALL_STACK does the same thing but the absolute program address is taken from the data stack. RET pops an address off the call stack then jumps to that address. --- lib/inst.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'lib/inst.h') diff --git a/lib/inst.h b/lib/inst.h index 55c062f..3877a2b 100644 --- a/lib/inst.h +++ b/lib/inst.h @@ -148,6 +148,10 @@ typedef enum OP_JUMP_IF_BYTE, OP_JUMP_IF_HWORD, OP_JUMP_IF_WORD, + // Subroutines + OP_CALL, + OP_CALL_STACK, + OP_RET, // Should not be an opcode NUMBER_OF_OPCODES, @@ -231,6 +235,9 @@ inst_t *insts_read_bytecode_file(FILE *, size_t *); #define INST_JUMP_STACK ((inst_t){.opcode = OP_JUMP_STACK}) #define INST_JUMP_IF(TYPE, OP) \ ((inst_t){.opcode = OP_JUMP_IF_##TYPE, .operand = DWORD(OP)}) +#define INST_CALL(OP) ((inst_t){.opcode = OP_CALL, .operand = DWORD(OP)}) +#define INST_CALL_STACK ((inst_t){.opcode = OP_CALL_STACK}) +#define INST_RET ((inst_t){.opcode = OP_RET}) #define INST_PRINT(TYPE) ((inst_t){.opcode = OP_PRINT_##TYPE}) #endif -- cgit v1.2.3-13-gbd6f