/*
- * 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_entfield_s ast_entfield;
+typedef struct ast_ifthen_s ast_ifthen;
/* 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;
+ /* 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**);
typedef struct
{
union {
double vfloat;
int vint;
- vector_t vvec;
+ vector vvec;
const char *vstring;
int ventity;
ast_function *vfunc;
*/
MEM_VECTOR_MAKE(ast_value*, params);
};
-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);
+/* 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**);
/* 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**);
+
+/* 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**);
+
+/* Store
+ *
+ * Stores left<-right and returns left.
+ * Specialized binary expression node
+ */
+struct ast_store_s
+{
+ ast_expression_common expression;
+ int op;
+ ast_value *dest; /* When we add pointers this might have to change to expression */
+ ast_expression *source;
+};
+ast_store* ast_store_new(lex_ctx ctx, int op,
+ ast_value *d, ast_expression *s);
+void ast_store_delete(ast_store*);
+
+bool ast_store_codegen(ast_store*, ast_function*, bool lvalue, ir_value**);
-/* maybe for this one */
-bool ast_bin_store_codegen(ast_binary*, ir_function*, 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*);
-/* could decide what to use */
-bool ast_binary_codegen(ast_binary*, ir_function*, ir_value**);
+bool ast_ifthen_codegen(ast_ifthen*, ast_function*, bool lvalue, ir_value**);
/* Blocks
*
MEM_VECTOR_MAKE(ast_value*, locals);
MEM_VECTOR_MAKE(ast_expression*, exprs);
};
-ast_block* ast_block_new(lex_ctx_t ctx);
+ast_block* ast_block_new(lex_ctx ctx);
void ast_block_delete(ast_block*);
MEM_VECTOR_PROTO(ast_block, ast_value*, locals);
MEM_VECTOR_PROTO(ast_block, ast_expression*, exprs);
-bool ast_block_codegen(ast_block*, ast_function*, ir_value**);
+bool ast_block_codegen(ast_block*, ast_function*, bool lvalue, ir_value**);
/* Function
*
ast_value *vtype;
const char *name;
+ ir_function *ir_func;
+
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*);
MEM_VECTOR_PROTO(ast_function, ast_block*, blocks);