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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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66
source/toy_routine.c
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@@ -47,11 +47,22 @@ static void emitFloat(void** handle, unsigned int* capacity, unsigned int* count
//write instructions based on the AST types
#define EMIT_BYTE(rt, part, byte) \
emitByte((void**)(&((*rt)->part)), &((*rt)->part##Capacity), &((*rt)->part##Count), byte);
emitByte((void**)(&((*rt)->part)), &((*rt)->part##Capacity), &((*rt)->part##Count), byte)
#define EMIT_INT(rt, part, bytes) \
emitInt((void**)(&((*rt)->part)), &((*rt)->part##Capacity), &((*rt)->part##Count), bytes);
emitInt((void**)(&((*rt)->part)), &((*rt)->part##Capacity), &((*rt)->part##Count), bytes)
#define EMIT_FLOAT(rt, part, bytes) \
emitFloat((void**)(&((*rt)->part)), &((*rt)->part##Capacity), &((*rt)->part##Count), bytes);
emitFloat((void**)(&((*rt)->part)), &((*rt)->part##Capacity), &((*rt)->part##Count), bytes)
//skip bytes, but return the address
#define SKIP_BYTE(rt, part) (EMIT_BYTE(rt, part, 0), ((*rt)->part##Count - 1))
#define SKIP_INT(rt, part) (EMIT_INT(rt, part, 0), ((*rt)->part##Count - 4))
//overwrite a pre-existing position
#define OVERWRITE_INT(rt, part, addr, bytes) \
emitInt((void**)(&((*rt)->part)), &((*rt)->part##Capacity), &(addr), bytes);
//simply get the address (always an integer)
#define CURRENT_ADDRESS(rt, part) ((*rt)->part##Count)
static void emitToJumpTable(Toy_Routine** rt, unsigned int startAddr) {
EMIT_INT(rt, code, (*rt)->jumpsCount); //mark the jump index in the code
@@ -296,6 +307,48 @@ static unsigned int writeInstructionAssert(Toy_Routine** rt, Toy_AstAssert ast)
return 0;
}
static unsigned int writeInstructionIfThenElse(Toy_Routine** rt, Toy_AstIfThenElse ast) {
//cond-branch
writeRoutineCode(rt, ast.condBranch);
//emit the jump word (opcode, type, condition, padding)
EMIT_BYTE(rt, code, TOY_OPCODE_JUMP);
EMIT_BYTE(rt, code, TOY_OP_PARAM_JUMP_RELATIVE);
EMIT_BYTE(rt, code, TOY_OP_PARAM_JUMP_IF_FALSE);
EMIT_BYTE(rt, code, 0);
unsigned int thenEndAddr = SKIP_INT(rt, code); //parameter to be written later
//emit then branch
writeRoutineCode(rt, ast.thenBranch);
if (ast.elseBranch != NULL) {
//emit the jump-to-end (opcode, type, condition, padding)
EMIT_BYTE(rt, code, TOY_OPCODE_JUMP);
EMIT_BYTE(rt, code, TOY_OP_PARAM_JUMP_RELATIVE);
EMIT_BYTE(rt, code, TOY_OP_PARAM_JUMP_ALWAYS);
EMIT_BYTE(rt, code, 0);
unsigned int elseEndAddr = SKIP_INT(rt, code); //parameter to be written later
//specify the starting position for the else branch
OVERWRITE_INT(rt, code, thenEndAddr, CURRENT_ADDRESS(rt, code) - thenEndAddr);
//emit the else branch
writeRoutineCode(rt, ast.elseBranch);
//specify the ending position for the else branch
OVERWRITE_INT(rt, code, elseEndAddr, CURRENT_ADDRESS(rt, code) - elseEndAddr);
}
else {
//without an else branch, set the jump destination and move on
OVERWRITE_INT(rt, code, thenEndAddr, CURRENT_ADDRESS(rt, code) - thenEndAddr);
}
return 0;
}
static unsigned int writeInstructionPrint(Toy_Routine** rt, Toy_AstPrint ast) {
//the thing to print
writeRoutineCode(rt, ast.child);
@@ -494,6 +547,7 @@ static unsigned int writeRoutineCode(Toy_Routine** rt, Toy_Ast* ast) {
return 0;
}
//NOTE: 'result' is used to in 'writeInstructionCompound()'
unsigned int result = 0;
//determine how to write each instruction based on the Ast
@@ -545,6 +599,10 @@ static unsigned int writeRoutineCode(Toy_Routine** rt, Toy_Ast* ast) {
result += writeInstructionAssert(rt, ast->assert);
break;
case TOY_AST_IF_THEN_ELSE:
result += writeInstructionIfThenElse(rt, ast->ifThenElse);
break;
case TOY_AST_PRINT:
result += writeInstructionPrint(rt, ast->print);
break;
@@ -596,7 +654,7 @@ static void* writeRoutine(Toy_Routine* rt, Toy_Ast* ast) {
//write the header and combine the parts
void* buffer = NULL;
unsigned int capacity = 0, count = 0;
// int paramAddr = 0, codeAddr = 0, subsAddr = 0;
// int paramAddr = 0, subsAddr = 0;
int codeAddr = 0;
int jumpsAddr = 0;
int dataAddr = 0;