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WIP: if-then-else, incomplete

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This commit is contained in:
Kayne Ruse
2024-11-19 17:14:39 +11:00
parent 7398898a61
commit 34577ecfe1
8 changed files with 197 additions and 11 deletions
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52
source/toy_vm.c
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@@ -31,7 +31,7 @@ static inline int readPostfixUtil(unsigned int* ptr, int amount) {
static inline void fixAlignment(Toy_VM* vm) {
//NOTE: It's a tilde, not a negative sign
vm->programCounter = (vm->programCounter + 3) & ~0b11;
vm->programCounter = (vm->programCounter + 3) & ~3;
}
//instruction handlers
@@ -361,6 +361,52 @@ static void processLogical(Toy_VM* vm, Toy_OpcodeType opcode) {
}
}
static void processJump(Toy_VM* vm) {
Toy_OpJumpType type = READ_BYTE(vm);
Toy_OpParamJumpConditional cond = READ_BYTE(vm);
fixAlignment(vm);
//assume the param is a signed integer
int param = READ_INT(vm);
//should we jump?
switch(cond) {
case TOY_OP_PARAM_JUMP_ALWAYS:
break;
case TOY_OP_PARAM_JUMP_IF_TRUE: {
Toy_Value value = Toy_popStack(&vm->stack);
if (Toy_checkValueIsTruthy(value) == true) {
Toy_freeValue(value);
break;
}
Toy_freeValue(value);
return;
}
case TOY_OP_PARAM_JUMP_IF_FALSE: {
Toy_Value value = Toy_popStack(&vm->stack);
if (Toy_checkValueIsTruthy(value) != true) {
Toy_freeValue(value);
break;
}
Toy_freeValue(value);
return;
}
}
//do the jump
switch(type) {
case TOY_OP_PARAM_JUMP_ABSOLUTE:
vm->programCounter = vm->codeAddr + param;
return;
case TOY_OP_PARAM_JUMP_RELATIVE:
vm->programCounter += param;
return;
}
}
static void processAssert(Toy_VM* vm) {
unsigned int count = READ_BYTE(vm);
@@ -551,6 +597,10 @@ static void process(Toy_VM* vm) {
//temp terminator
return;
case TOY_OPCODE_JUMP:
processJump(vm);
break;
case TOY_OPCODE_SCOPE_PUSH:
vm->scope = Toy_pushScope(&vm->scopeBucket, vm->scope);
break;