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parsing assignment operators

master
Josh Wolfe 2015-12-12 19:07:29 -07:00
parent eb1542c102
commit 5cb5f5dbf6
4 changed files with 179 additions and 30 deletions
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63
src/analyze.cpp
View File

@ -714,6 +714,50 @@ static TypeTableEntry *analyze_variable_name(CodeGen *g, BlockContext *context,
}
}
static bool is_op_allowed(TypeTableEntry *type, BinOpType op) {
switch (op) {
case BinOpTypeAssign:
return true;
case BinOpTypeAssignTimes:
case BinOpTypeAssignDiv:
case BinOpTypeAssignMod:
case BinOpTypeAssignPlus:
case BinOpTypeAssignMinus:
return type->id == TypeTableEntryIdInt || type->id == TypeTableEntryIdFloat;
case BinOpTypeAssignBitShiftLeft:
case BinOpTypeAssignBitShiftRight:
case BinOpTypeAssignBitAnd:
case BinOpTypeAssignBitXor:
case BinOpTypeAssignBitOr:
return type->id == TypeTableEntryIdInt;
case BinOpTypeAssignBoolAnd:
case BinOpTypeAssignBoolOr:
return type->id == TypeTableEntryIdBool;
case BinOpTypeInvalid:
case BinOpTypeBoolOr:
case BinOpTypeBoolAnd:
case BinOpTypeCmpEq:
case BinOpTypeCmpNotEq:
case BinOpTypeCmpLessThan:
case BinOpTypeCmpGreaterThan:
case BinOpTypeCmpLessOrEq:
case BinOpTypeCmpGreaterOrEq:
case BinOpTypeBinOr:
case BinOpTypeBinXor:
case BinOpTypeBinAnd:
case BinOpTypeBitShiftLeft:
case BinOpTypeBitShiftRight:
case BinOpTypeAdd:
case BinOpTypeSub:
case BinOpTypeMult:
case BinOpTypeDiv:
case BinOpTypeMod:
zig_unreachable();
}
zig_unreachable();
}
static TypeTableEntry * analyze_expression(CodeGen *g, ImportTableEntry *import, BlockContext *context,
TypeTableEntry *expected_type, AstNode *node)
{
@ -842,6 +886,18 @@ static TypeTableEntry * analyze_expression(CodeGen *g, ImportTableEntry *import,
{
switch (node->data.bin_op_expr.bin_op) {
case BinOpTypeAssign:
case BinOpTypeAssignTimes:
case BinOpTypeAssignDiv:
case BinOpTypeAssignMod:
case BinOpTypeAssignPlus:
case BinOpTypeAssignMinus:
case BinOpTypeAssignBitShiftLeft:
case BinOpTypeAssignBitShiftRight:
case BinOpTypeAssignBitAnd:
case BinOpTypeAssignBitXor:
case BinOpTypeAssignBitOr:
case BinOpTypeAssignBoolAnd:
case BinOpTypeAssignBoolOr:
{
AstNode *lhs_node = node->data.bin_op_expr.op1;
TypeTableEntry *expected_rhs_type = nullptr;
@ -853,7 +909,12 @@ static TypeTableEntry * analyze_expression(CodeGen *g, ImportTableEntry *import,
add_node_error(g, lhs_node,
buf_sprintf("cannot assign to constant variable"));
} else {
expected_rhs_type = var->type;
if (!is_op_allowed(var->type, node->data.bin_op_expr.bin_op)) {
add_node_error(g, lhs_node,
buf_sprintf("operator not allowed for type '%s'", buf_ptr(&var->type->name)));
} else {
expected_rhs_type = var->type;
}
}
} else {
add_node_error(g, lhs_node,

34
src/codegen.cpp
View File

@ -409,6 +409,18 @@ static LLVMValueRef gen_arithmetic_bin_op_expr(CodeGen *g, AstNode *node) {
case BinOpTypeCmpGreaterOrEq:
case BinOpTypeInvalid:
case BinOpTypeAssign:
case BinOpTypeAssignTimes:
case BinOpTypeAssignDiv:
case BinOpTypeAssignMod:
case BinOpTypeAssignPlus:
case BinOpTypeAssignMinus:
case BinOpTypeAssignBitShiftLeft:
case BinOpTypeAssignBitShiftRight:
case BinOpTypeAssignBitAnd:
case BinOpTypeAssignBitXor:
case BinOpTypeAssignBitOr:
case BinOpTypeAssignBoolAnd:
case BinOpTypeAssignBoolOr:
zig_unreachable();
}
zig_unreachable();
@ -543,6 +555,11 @@ static LLVMValueRef gen_assign_expr(CodeGen *g, AstNode *node) {
AstNode *lhs_node = node->data.bin_op_expr.op1;
bool is_read_first = node->data.bin_op_expr.bin_op != BinOpTypeAssign;
if (is_read_first) {
zig_panic("TODO: implement modify assignment ops");
}
if (lhs_node->type == NodeTypeSymbol) {
LocalVariableTableEntry *var = find_local_variable(node->codegen_node->expr_node.block_context,
&lhs_node->data.symbol);
@ -577,15 +594,26 @@ static LLVMValueRef gen_assign_expr(CodeGen *g, AstNode *node) {
} else {
zig_panic("bad assign target");
}
}
static LLVMValueRef gen_bin_op_expr(CodeGen *g, AstNode *node) {
switch (node->data.bin_op_expr.bin_op) {
case BinOpTypeAssign:
return gen_assign_expr(g, node);
case BinOpTypeInvalid:
zig_unreachable();
case BinOpTypeAssign:
case BinOpTypeAssignTimes:
case BinOpTypeAssignDiv:
case BinOpTypeAssignMod:
case BinOpTypeAssignPlus:
case BinOpTypeAssignMinus:
case BinOpTypeAssignBitShiftLeft:
case BinOpTypeAssignBitShiftRight:
case BinOpTypeAssignBitAnd:
case BinOpTypeAssignBitXor:
case BinOpTypeAssignBitOr:
case BinOpTypeAssignBoolAnd:
case BinOpTypeAssignBoolOr:
return gen_assign_expr(g, node);
case BinOpTypeBoolOr:
return gen_bool_or_expr(g, node);
case BinOpTypeBoolAnd:

100
src/parser.cpp
View File

@ -14,26 +14,38 @@
static const char *bin_op_str(BinOpType bin_op) {
switch (bin_op) {
case BinOpTypeInvalid: return "(invalid)";
case BinOpTypeBoolOr: return "||";
case BinOpTypeBoolAnd: return "&&";
case BinOpTypeCmpEq: return "==";
case BinOpTypeCmpNotEq: return "!=";
case BinOpTypeCmpLessThan: return "<";
case BinOpTypeCmpGreaterThan: return ">";
case BinOpTypeCmpLessOrEq: return "<=";
case BinOpTypeCmpGreaterOrEq: return ">=";
case BinOpTypeBinOr: return "|";
case BinOpTypeBinXor: return "^";
case BinOpTypeBinAnd: return "&";
case BinOpTypeBitShiftLeft: return "<<";
case BinOpTypeBitShiftRight: return ">>";
case BinOpTypeAdd: return "+";
case BinOpTypeSub: return "-";
case BinOpTypeMult: return "*";
case BinOpTypeDiv: return "/";
case BinOpTypeMod: return "%";
case BinOpTypeAssign: return "=";
case BinOpTypeInvalid: return "(invalid)";
case BinOpTypeBoolOr: return "||";
case BinOpTypeBoolAnd: return "&&";
case BinOpTypeCmpEq: return "==";
case BinOpTypeCmpNotEq: return "!=";
case BinOpTypeCmpLessThan: return "<";
case BinOpTypeCmpGreaterThan: return ">";
case BinOpTypeCmpLessOrEq: return "<=";
case BinOpTypeCmpGreaterOrEq: return ">=";
case BinOpTypeBinOr: return "|";
case BinOpTypeBinXor: return "^";
case BinOpTypeBinAnd: return "&";
case BinOpTypeBitShiftLeft: return "<<";
case BinOpTypeBitShiftRight: return ">>";
case BinOpTypeAdd: return "+";
case BinOpTypeSub: return "-";
case BinOpTypeMult: return "*";
case BinOpTypeDiv: return "/";
case BinOpTypeMod: return "%";
case BinOpTypeAssign: return "=";
case BinOpTypeAssignTimes: return "*=";
case BinOpTypeAssignDiv: return "/=";
case BinOpTypeAssignMod: return "%=";
case BinOpTypeAssignPlus: return "+=";
case BinOpTypeAssignMinus: return "-=";
case BinOpTypeAssignBitShiftLeft: return "<<=";
case BinOpTypeAssignBitShiftRight: return ">>=";
case BinOpTypeAssignBitAnd: return "&=";
case BinOpTypeAssignBitXor: return "^=";
case BinOpTypeAssignBitOr: return "|=";
case BinOpTypeAssignBoolAnd: return "&&=";
case BinOpTypeAssignBoolOr: return "||=";
}
zig_unreachable();
}
@ -103,7 +115,7 @@ const char *node_type_str(NodeType node_type) {
case NodeTypeLabel:
return "Label";
case NodeTypeGoto:
return "Label";
return "Goto";
case NodeTypeAsmExpr:
return "AsmExpr";
case NodeTypeFieldAccessExpr:
@ -1448,24 +1460,60 @@ static AstNode *ast_parse_block_expr(ParseContext *pc, int *token_index, bool ma
return nullptr;
}
static BinOpType tok_to_ass_op(Token *token) {
switch (token->id) {
case TokenIdEq: return BinOpTypeAssign;
case TokenIdTimesEq: return BinOpTypeAssignTimes;
case TokenIdDivEq: return BinOpTypeAssignDiv;
case TokenIdModEq: return BinOpTypeAssignMod;
case TokenIdPlusEq: return BinOpTypeAssignPlus;
case TokenIdMinusEq: return BinOpTypeAssignMinus;
case TokenIdBitShiftLeftEq: return BinOpTypeAssignBitShiftLeft;
case TokenIdBitShiftRightEq: return BinOpTypeAssignBitShiftRight;
case TokenIdBitAndEq: return BinOpTypeAssignBitAnd;
case TokenIdBitXorEq: return BinOpTypeAssignBitXor;
case TokenIdBitOrEq: return BinOpTypeAssignBitOr;
case TokenIdBoolAndEq: return BinOpTypeAssignBoolAnd;
case TokenIdBoolOrEq: return BinOpTypeAssignBoolOr;
default: return BinOpTypeInvalid;
}
}
/*
AssignmentExpression : BoolOrExpression token(Equal) BoolOrExpression | BoolOrExpression
AssignmentOperator : token(Eq) | token(TimesEq) | token(DivEq) | token(ModEq) | token(PlusEq) | token(MinusEq) | token(BitShiftLeftEq) | token(BitShiftRightEq) | token(BitAndEq) | token(BitXorEq) | token(BitOrEq) | token(BoolAndEq) | token(BoolOrEq)
*/
static BinOpType ast_parse_ass_op(ParseContext *pc, int *token_index, bool mandatory) {
Token *token = &pc->tokens->at(*token_index);
BinOpType result = tok_to_ass_op(token);
if (result == BinOpTypeInvalid) {
if (mandatory) {
ast_invalid_token_error(pc, token);
} else {
return BinOpTypeInvalid;
}
}
*token_index += 1;
return result;
}
/*
AssignmentExpression : BoolOrExpression AssignmentOperator BoolOrExpression | BoolOrExpression
*/
static AstNode *ast_parse_ass_expr(ParseContext *pc, int *token_index, bool mandatory) {
AstNode *lhs = ast_parse_bool_or_expr(pc, token_index, mandatory);
if (!lhs)
return lhs;
return nullptr;
Token *token = &pc->tokens->at(*token_index);
if (token->id != TokenIdEq)
BinOpType ass_op = ast_parse_ass_op(pc, token_index, false);
if (ass_op == BinOpTypeInvalid)
return lhs;
*token_index += 1;
AstNode *rhs = ast_parse_bool_or_expr(pc, token_index, true);
AstNode *node = ast_create_node(pc, NodeTypeBinOpExpr, token);
node->data.bin_op_expr.op1 = lhs;
node->data.bin_op_expr.bin_op = BinOpTypeAssign;
node->data.bin_op_expr.bin_op = ass_op;
node->data.bin_op_expr.op2 = rhs;
return node;

12
src/parser.hpp
View File

@ -119,6 +119,18 @@ struct AstNodeVariableDeclaration {
enum BinOpType {
BinOpTypeInvalid,
BinOpTypeAssign,
BinOpTypeAssignTimes,
BinOpTypeAssignDiv,
BinOpTypeAssignMod,
BinOpTypeAssignPlus,
BinOpTypeAssignMinus,
BinOpTypeAssignBitShiftLeft,
BinOpTypeAssignBitShiftRight,
BinOpTypeAssignBitAnd,
BinOpTypeAssignBitXor,
BinOpTypeAssignBitOr,
BinOpTypeAssignBoolAnd,
BinOpTypeAssignBoolOr,
BinOpTypeBoolOr,
BinOpTypeBoolAnd,
BinOpTypeCmpEq,