/*
- * Copyright (C) 2012
+ * Copyright (C) 2012
* Wolfgang Bumiller
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
-#ifndef GMQCC_AST_H__
-#define GMQCC_AST_H__
-
-#include "astir.h"
+#ifndef GMQCC_AST_HDR
+#define GMQCC_AST_HDR
#include "ir.h"
/* Note: I will not be using a _t suffix for the
typedef struct ast_function_s ast_function;
typedef struct ast_block_s ast_block;
typedef struct ast_binary_s ast_binary;
+typedef struct ast_store_s ast_store;
+typedef struct ast_binstore_s ast_binstore;
+typedef struct ast_entfield_s ast_entfield;
+typedef struct ast_ifthen_s ast_ifthen;
+typedef struct ast_ternary_s ast_ternary;
+typedef struct ast_loop_s ast_loop;
+typedef struct ast_call_s ast_call;
+typedef struct ast_unary_s ast_unary;
+typedef struct ast_return_s ast_return;
+typedef struct ast_member_s ast_member;
+
+enum {
+ TYPE_ast_node,
+ TYPE_ast_expression,
+ TYPE_ast_value,
+ TYPE_ast_function,
+ TYPE_ast_block,
+ TYPE_ast_binary,
+ TYPE_ast_store,
+ TYPE_ast_binstore,
+ TYPE_ast_entfield,
+ TYPE_ast_ifthen,
+ TYPE_ast_ternary,
+ TYPE_ast_loop,
+ TYPE_ast_call,
+ TYPE_ast_unary,
+ TYPE_ast_return,
+ TYPE_ast_member
+};
+
+#define ast_istype(x, t) ( ((ast_node_common*)x)->nodetype == (TYPE_##t) )
+#define ast_ctx(node) (((ast_node_common*)(node))->context)
/* Node interface with common components
*/
typedef void ast_node_delete(ast_node*);
typedef struct
{
- lex_ctx_t context;
+ lex_ctx context;
/* I don't feel comfortable using keywords like 'delete' as names... */
ast_node_delete *destroy;
+ int nodetype;
+ /* keep: if a node contains this node, 'keep'
+ * prevents its dtor from destroying this node as well.
+ */
+ bool keep;
} ast_node_common;
#define ast_delete(x) ( ( (ast_node*)(x) ) -> node.destroy )((ast_node*)(x))
+#define ast_unref(x) do \
+{ \
+ if (! (((ast_node*)(x))->node.keep) ) { \
+ ast_delete(x); \
+ } \
+} while(0)
/* Expression interface
*
*/
typedef bool ast_expression_codegen(ast_expression*,
ast_function*,
+ bool lvalue,
ir_value**);
+/* TODO: the codegen function should take an output-type parameter
+ * indicating whether a variable, type, label etc. is expected, and
+ * an environment!
+ * Then later an ast_ident could have a codegen using this to figure
+ * out what to look for.
+ * eg. in code which uses a not-yet defined variable, the expression
+ * would take an ast_ident, and the codegen would be called with
+ * type `expression`, so the ast_ident's codegen would search for
+ * variables through the environment (or functions, constants...).
+ */
typedef struct
{
ast_node_common node;
ast_expression_codegen *codegen;
+ int vtype;
+ ast_expression *next;
+ /* arrays get a member-count */
+ size_t count;
+ MEM_VECTOR_MAKE(ast_value*, params);
+ bool variadic;
+ /* The codegen functions should store their output values
+ * so we can call it multiple times without re-evaluating.
+ * Store lvalue and rvalue seperately though. So that
+ * ast_entfield for example can generate both if required.
+ */
+ ir_value *outl;
+ ir_value *outr;
} ast_expression_common;
+MEM_VECTOR_PROTO(ast_expression_common, ast_value*, params);
/* Value
*
const char *name;
+ /*
int vtype;
ast_value *next;
+ */
bool isconst;
union {
double vfloat;
int vint;
- vector_t vvec;
+ vector vvec;
const char *vstring;
int ventity;
ast_function *vfunc;
} constval;
- ir_value *ir_v;
+ /* usecount for the parser */
+ size_t uses;
- /* if vtype is qc_function, params contain parameters, and
- * 'next' the return type.
- */
- MEM_VECTOR_MAKE(ast_value*, params);
+ ir_value *ir_v;
+ ir_value **ir_values;
+ size_t ir_value_count;
};
-ast_value* ast_value_new(lex_ctx_t ctx, const char *name, int qctype);
+
+ast_value* ast_value_new(lex_ctx ctx, const char *name, int qctype);
+ast_value* ast_value_copy(const ast_value *self);
+/* This will NOT delete an underlying ast_function */
void ast_value_delete(ast_value*);
-void ast_value_set_name(ast_value*, const char *name);
+bool ast_value_set_name(ast_value*, const char *name);
-bool ast_value_codegen(ast_value*, ast_function*, ir_value**);
+bool ast_value_codegen(ast_value*, ast_function*, bool lvalue, ir_value**);
+bool ast_local_codegen(ast_value *self, ir_function *func, bool isparam);
+bool ast_global_codegen(ast_value *self, ir_builder *ir, bool isfield);
+
+bool GMQCC_WARN ast_value_params_add(ast_value*, ast_value*);
+
+bool ast_compare_type(ast_expression *a, ast_expression *b);
+ast_expression* ast_type_copy(lex_ctx ctx, const ast_expression *ex);
+#define ast_type_adopt(a, b) ast_type_adopt_impl((ast_expression*)(a), (ast_expression*)(b))
+bool ast_type_adopt_impl(ast_expression *self, const ast_expression *other);
+void ast_type_to_string(ast_expression *e, char *buf, size_t bufsize);
/* Binary
*
{
ast_expression_common expression;
- int op;
- ast_value *left;
- ast_value *right;
+ int op;
+ ast_expression *left;
+ ast_expression *right;
};
-ast_binary* ast_binary_new(lex_ctx_t ctx,
+ast_binary* ast_binary_new(lex_ctx ctx,
int op,
- ast_value *left,
- ast_value *right);
+ ast_expression *left,
+ ast_expression *right);
void ast_binary_delete(ast_binary*);
-/* hmm, seperate functions? */
-bool ast_bin_add_codegen(ast_binary*, ir_function*, ir_value**);
-/* ... */
+bool ast_binary_codegen(ast_binary*, ast_function*, bool lvalue, ir_value**);
+
+/* Binstore
+ *
+ * An assignment including a binary expression with the source as left operand.
+ * Eg. a += b; is a binstore { INSTR_STORE, INSTR_ADD, a, b }
+ */
+struct ast_binstore_s
+{
+ ast_expression_common expression;
+
+ int opstore;
+ int opbin;
+ ast_expression *dest;
+ ast_expression *source;
+};
+ast_binstore* ast_binstore_new(lex_ctx ctx,
+ int storeop,
+ int op,
+ ast_expression *left,
+ ast_expression *right);
+void ast_binstore_delete(ast_binstore*);
+
+bool ast_binstore_codegen(ast_binstore*, ast_function*, bool lvalue, ir_value**);
+
+/* Unary
+ *
+ * Regular unary expressions: not,neg
+ */
+struct ast_unary_s
+{
+ ast_expression_common expression;
+
+ int op;
+ ast_expression *operand;
+};
+ast_unary* ast_unary_new(lex_ctx ctx,
+ int op,
+ ast_expression *expr);
+void ast_unary_delete(ast_unary*);
+
+bool ast_unary_codegen(ast_unary*, ast_function*, bool lvalue, ir_value**);
+
+/* Return
+ *
+ * Make sure 'return' only happens at the end of a block, otherwise the IR
+ * will refuse to create further instructions.
+ * This should be honored by the parser.
+ */
+struct ast_return_s
+{
+ ast_expression_common expression;
+ ast_expression *operand;
+};
+ast_return* ast_return_new(lex_ctx ctx,
+ ast_expression *expr);
+void ast_return_delete(ast_return*);
+
+bool ast_return_codegen(ast_return*, ast_function*, bool lvalue, ir_value**);
+
+/* Entity-field
+ *
+ * This must do 2 things:
+ * -) Provide a way to fetch an entity field value. (Rvalue)
+ * -) Provide a pointer to an entity field. (Lvalue)
+ * The problem:
+ * In original QC, there's only a STORE via pointer, but
+ * no LOAD via pointer.
+ * So we must know beforehand if we are going to read or assign
+ * the field.
+ * For this we will have to extend the codegen() functions with
+ * a flag saying whether or not we need an L or an R-value.
+ */
+struct ast_entfield_s
+{
+ ast_expression_common expression;
+ /* The entity can come from an expression of course. */
+ ast_expression *entity;
+ /* As can the field, it just must result in a value of TYPE_FIELD */
+ ast_expression *field;
+};
+ast_entfield* ast_entfield_new(lex_ctx ctx, ast_expression *entity, ast_expression *field);
+void ast_entfield_delete(ast_entfield*);
+
+bool ast_entfield_codegen(ast_entfield*, ast_function*, bool lvalue, ir_value**);
+
+/* Member access:
+ *
+ * For now used for vectors. If we get structs or unions
+ * we can have them handled here as well.
+ */
+struct ast_member_s
+{
+ ast_expression_common expression;
+ ast_expression *owner;
+ unsigned int field;
+};
+ast_member* ast_member_new(lex_ctx ctx, ast_expression *owner, unsigned int field);
+void ast_member_delete(ast_member*);
+
+bool ast_member_codegen(ast_member*, ast_function*, bool lvalue, ir_value**);
+
+/* Store
+ *
+ * Stores left<-right and returns left.
+ * Specialized binary expression node
+ */
+struct ast_store_s
+{
+ ast_expression_common expression;
+ int op;
+ ast_expression *dest;
+ ast_expression *source;
+};
+ast_store* ast_store_new(lex_ctx ctx, int op,
+ ast_expression *d, ast_expression *s);
+void ast_store_delete(ast_store*);
+
+bool ast_store_codegen(ast_store*, ast_function*, bool lvalue, ir_value**);
+
+/* If
+ *
+ * A general 'if then else' statement, either side can be NULL and will
+ * thus be omitted. It is an error for *both* cases to be NULL at once.
+ *
+ * During its 'codegen' it'll be changing the ast_function's block.
+ *
+ * An if is also an "expression". Its codegen will put NULL into the
+ * output field though. For ternary expressions an ast_ternary will be
+ * added.
+ */
+struct ast_ifthen_s
+{
+ ast_expression_common expression;
+ ast_expression *cond;
+ /* It's all just 'expressions', since an ast_block is one too. */
+ ast_expression *on_true;
+ ast_expression *on_false;
+};
+ast_ifthen* ast_ifthen_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse);
+void ast_ifthen_delete(ast_ifthen*);
+
+bool ast_ifthen_codegen(ast_ifthen*, ast_function*, bool lvalue, ir_value**);
+
+/* Ternary expressions...
+ *
+ * Contrary to 'if-then-else' nodes, ternary expressions actually
+ * return a value, otherwise they behave the very same way.
+ * The difference in 'codegen' is that it'll return the value of
+ * a PHI node.
+ *
+ * The other difference is that in an ast_ternary, NEITHER side
+ * must be NULL, there's ALWAYS an else branch.
+ *
+ * This is the only ast_node beside ast_value which contains
+ * an ir_value. Theoretically we don't need to remember it though.
+ */
+struct ast_ternary_s
+{
+ ast_expression_common expression;
+ ast_expression *cond;
+ /* It's all just 'expressions', since an ast_block is one too. */
+ ast_expression *on_true;
+ ast_expression *on_false;
+ /* After a ternary expression we find ourselves in a new IR block
+ * and start with a PHI node */
+ ir_value *phi_out;
+};
+ast_ternary* ast_ternary_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse);
+void ast_ternary_delete(ast_ternary*);
+
+bool ast_ternary_codegen(ast_ternary*, ast_function*, bool lvalue, ir_value**);
+
+/* A general loop node
+ *
+ * For convenience it contains 4 parts:
+ * -) (ini) = initializing expression
+ * -) (pre) = pre-loop condition
+ * -) (pst) = post-loop condition
+ * -) (inc) = "increment" expression
+ * The following is a psudo-representation of this loop
+ * note that '=>' bears the logical meaning of "implies".
+ * (a => b) equals (!a || b)
+
+{ini};
+while (has_pre => {pre})
+{
+ {body};
+
+continue: // a 'continue' will jump here
+ if (has_pst => {pst})
+ break;
+
+ {inc};
+}
+ */
+struct ast_loop_s
+{
+ ast_expression_common expression;
+ ast_expression *initexpr;
+ ast_expression *precond;
+ ast_expression *postcond;
+ ast_expression *increment;
+ ast_expression *body;
+};
+ast_loop* ast_loop_new(lex_ctx ctx,
+ ast_expression *initexpr,
+ ast_expression *precond,
+ ast_expression *postcond,
+ ast_expression *increment,
+ ast_expression *body);
+void ast_loop_delete(ast_loop*);
+
+bool ast_loop_codegen(ast_loop*, ast_function*, bool lvalue, ir_value**);
-/* maybe for this one */
-bool ast_bin_store_codegen(ast_binary*, ir_function*, ir_value**);
+/* CALL node
+ *
+ * Contains an ast_expression as target, rather than an ast_function/value.
+ * Since it's how QC works, every ast_function has an ast_value
+ * associated anyway - in other words, the VM contains function
+ * pointers for every function anyway. Thus, this node will call
+ * expression.
+ * Additionally it contains a list of ast_expressions as parameters.
+ * Since calls can return values, an ast_call is also an ast_expression.
+ */
+struct ast_call_s
+{
+ ast_expression_common expression;
+ ast_expression *func;
+ MEM_VECTOR_MAKE(ast_expression*, params);
+};
+ast_call* ast_call_new(lex_ctx ctx,
+ ast_expression *funcexpr);
+void ast_call_delete(ast_call*);
+bool ast_call_codegen(ast_call*, ast_function*, bool lvalue, ir_value**);
+bool ast_call_check_types(ast_call*);
-/* could decide what to use */
-bool ast_binary_codegen(ast_binary*, ir_function*, ir_value**);
+MEM_VECTOR_PROTO(ast_call, ast_expression*, params);
/* Blocks
*
MEM_VECTOR_MAKE(ast_value*, locals);
MEM_VECTOR_MAKE(ast_expression*, exprs);
+ MEM_VECTOR_MAKE(ast_expression*, collect);
};
-ast_block* ast_block_new(lex_ctx_t ctx);
+ast_block* ast_block_new(lex_ctx ctx);
void ast_block_delete(ast_block*);
+bool ast_block_set_type(ast_block*, ast_expression *from);
MEM_VECTOR_PROTO(ast_block, ast_value*, locals);
MEM_VECTOR_PROTO(ast_block, ast_expression*, exprs);
+MEM_VECTOR_PROTO(ast_block, ast_expression*, collect);
-bool ast_block_codegen(ast_block*, ast_function*, ir_value**);
+bool ast_block_codegen(ast_block*, ast_function*, bool lvalue, ir_value**);
+bool ast_block_collect(ast_block*, ast_expression*);
/* Function
*
ast_value *vtype;
const char *name;
+ int builtin;
+
+ ir_function *ir_func;
+ ir_block *curblock;
+ ir_block *breakblock;
+ ir_block *continueblock;
+
+ size_t labelcount;
+ /* in order for thread safety - for the optional
+ * channel abesed multithreading... keeping a buffer
+ * here to use in ast_function_label.
+ */
+ char labelbuf[64];
+
MEM_VECTOR_MAKE(ast_block*, blocks);
};
-ast_function* ast_function_new(lex_ctx_t ctx, const char *name, ast_value *vtype);
+ast_function* ast_function_new(lex_ctx ctx, const char *name, ast_value *vtype);
+/* This will NOT delete the underlying ast_value */
void ast_function_delete(ast_function*);
+/* For "optimized" builds this can just keep returning "foo"...
+ * or whatever...
+ */
+const char* ast_function_label(ast_function*, const char *prefix);
MEM_VECTOR_PROTO(ast_function, ast_block*, blocks);
{
ast_expression_common expression;
- ast_binary binary;
- ast_block block;
+ ast_value value;
+ ast_binary binary;
+ ast_block block;
+ ast_ternary ternary;
+ ast_ifthen ifthen;
+ ast_store store;
+ ast_entfield entfield;
};
/* Node union
projects / xonotic / gmqcc.git / blobdiff