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// This file defines how to compile comparisons
#include "../ast.h"
#include "../config.h"
#include "../environment.h"
#include "../stdlib/text.h"
#include "../typecheck.h"
#include "compilation.h"
static CONSTFUNC const char *comparison_operator(ast_e tag) {
switch (tag) {
case Equals: return "==";
case NotEquals: return "!=";
case LessThan: return "<";
case LessThanOrEquals: return "<=";
case GreaterThan: return ">";
case GreaterThanOrEquals: return ">=";
default: return NULL;
}
}
Text_t compile_comparison(env_t *env, ast_t *ast) {
switch (ast->tag) {
case Equals:
case NotEquals: {
binary_operands_t binop = BINARY_OPERANDS(ast);
type_t *lhs_t = get_type(env, binop.lhs);
type_t *rhs_t = get_type(with_enum_scope(env, lhs_t), binop.rhs);
type_t *operand_t;
if (type_eq(lhs_t, rhs_t)) {
operand_t = lhs_t;
} else if (binop.lhs->tag == Int && is_numeric_type(rhs_t)) {
operand_t = rhs_t;
} else if (binop.rhs->tag == Int && is_numeric_type(lhs_t)) {
operand_t = lhs_t;
} else if (can_compile_to_type(with_enum_scope(env, lhs_t), binop.rhs, lhs_t)) {
operand_t = lhs_t;
} else if (can_compile_to_type(env, binop.lhs, rhs_t)) {
operand_t = rhs_t;
} else {
code_err(ast, "I can't do comparisons between ", type_to_text(lhs_t), " and ", type_to_text(rhs_t));
}
assert(operand_t);
Text_t lhs, rhs;
lhs = compile_to_type(env, binop.lhs, operand_t);
rhs = compile_to_type(env, binop.rhs, operand_t);
switch (operand_t->tag) {
case BigIntType:
return Texts(ast->tag == Equals ? EMPTY_TEXT : Text("!"), "Int$equal_value(", lhs, ", ", rhs, ")");
case BoolType:
case ByteType:
case IntType:
case FloatType:
case PointerType:
case FunctionType: return Texts("(", lhs, ast->tag == Equals ? " == " : " != ", rhs, ")");
default:
return Texts(ast->tag == Equals ? EMPTY_TEXT : Text("!"), "generic_equal(stack(", lhs, "), stack(", rhs,
"), ", compile_type_info(operand_t), ")");
}
}
case LessThan:
case LessThanOrEquals:
case GreaterThan:
case GreaterThanOrEquals:
case Compare: {
binary_operands_t cmp = BINARY_OPERANDS(ast);
type_t *lhs_t = get_type(env, cmp.lhs);
type_t *rhs_t = get_type(env, cmp.rhs);
type_t *operand_t;
if (type_eq(lhs_t, rhs_t)) {
operand_t = lhs_t;
} else if (cmp.lhs->tag == Int && is_numeric_type(rhs_t)) {
operand_t = rhs_t;
} else if (cmp.rhs->tag == Int && is_numeric_type(lhs_t)) {
operand_t = lhs_t;
} else if (can_compile_to_type(env, cmp.rhs, lhs_t)) {
operand_t = lhs_t;
} else if (can_compile_to_type(env, cmp.lhs, rhs_t)) {
operand_t = rhs_t;
} else {
code_err(ast, "I can't do comparisons between ", type_to_text(lhs_t), " and ", type_to_text(rhs_t));
}
Text_t lhs = compile_to_type(env, cmp.lhs, operand_t);
Text_t rhs = compile_to_type(env, cmp.rhs, operand_t);
if (ast->tag == Compare)
return Texts("generic_compare(stack(", lhs, "), stack(", rhs, "), ", compile_type_info(operand_t), ")");
const char *op = comparison_operator(ast->tag);
switch (operand_t->tag) {
case BigIntType: return Texts("(Int$compare_value(", lhs, ", ", rhs, ") ", op, " 0)");
case BoolType:
case ByteType:
case IntType:
case FloatType:
case PointerType:
case FunctionType: return Texts("(", lhs, " ", op, " ", rhs, ")");
default:
return Texts("(generic_compare(stack(", lhs, "), stack(", rhs, "), ", compile_type_info(operand_t), ") ",
op, " 0)");
}
}
default: code_err(ast, "This is not a comparison!");
}
}
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