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Prefix '++' working (postfix is next)

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Kayne Ruse
2025-01-09 16:45:48 +11:00
parent 3aee2ba664
commit 6f16c31f24
7 changed files with 102 additions and 79 deletions
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41
source/toy_routine.c
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@@ -176,10 +176,11 @@ static unsigned int writeInstructionValue(Toy_Routine** rt, Toy_AstValue ast) {
}
static unsigned int writeInstructionUnary(Toy_Routine** rt, Toy_AstUnary ast) {
//working with a stack means the child gets placed first
unsigned int result = writeRoutineCode(rt, ast.child);
unsigned int result = 0;
if (ast.flag == TOY_AST_FLAG_NEGATE) {
result = writeRoutineCode(rt, ast.child);
EMIT_BYTE(rt, code, TOY_OPCODE_NEGATE);
//4-byte alignment
@@ -187,6 +188,42 @@ static unsigned int writeInstructionUnary(Toy_Routine** rt, Toy_AstUnary ast) {
EMIT_BYTE(rt, code, 0);
EMIT_BYTE(rt, code, 0);
}
else if (ast.flag == TOY_AST_FLAG_PREFIX_INCREMENT || ast.flag == TOY_AST_FLAG_PREFIX_DECREMENT) { //NOTE: tightly coupled to the parser's logic, and somewhat duplicates ACCESS
//read the var name onto the stack
Toy_String* name = TOY_VALUE_AS_STRING(ast.child->value.value);
EMIT_BYTE(rt, code, TOY_OPCODE_READ);
EMIT_BYTE(rt, code, TOY_VALUE_STRING);
EMIT_BYTE(rt, code, TOY_STRING_NAME);
EMIT_BYTE(rt, code, name->info.length); //store the length (max 255)
emitString(rt, name);
//duplicate the var name, then get the value
EMIT_BYTE(rt, code,TOY_OPCODE_DUPLICATE);
EMIT_BYTE(rt, code, TOY_OPCODE_ACCESS); //squeezed
EMIT_BYTE(rt, code, 0);
EMIT_BYTE(rt, code, 0);
//read the integer '1'
EMIT_BYTE(rt, code, TOY_OPCODE_READ);
EMIT_BYTE(rt, code, TOY_VALUE_INTEGER);
EMIT_BYTE(rt, code, 0);
EMIT_BYTE(rt, code, 0);
EMIT_INT(rt, code, 1);
//add (or subtract) the two values, then assign (pops the second duplicate, and leaves value on the stack)
EMIT_BYTE(rt, code, ast.flag == TOY_AST_FLAG_PREFIX_INCREMENT ? TOY_OPCODE_ADD : TOY_OPCODE_SUBTRACT);
EMIT_BYTE(rt, code,TOY_OPCODE_ASSIGN); //squeezed
EMIT_BYTE(rt, code,0);
EMIT_BYTE(rt, code,0);
//leaves one value on the stack
result = 1;
}
else {
fprintf(stderr, TOY_CC_ERROR "ERROR: Invalid AST unary flag found\n" TOY_CC_RESET);
exit(-1);