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if-then-else AST node - this one is not for ternary expressions

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Wolfgang Bumiller 2012-05-01 16:55:02 +02:00
parent bb7c59c648
commit 5fe87e6a20
2 changed files with 56 additions and 0 deletions
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31
ast.c
View file

@ -153,6 +153,31 @@ void ast_entfield_delete(ast_entfield *self)
mem_d(self);
}
ast_ifthen* ast_ifthen_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse)
{
ast_instantiate(ast_ifthen, ctx, ast_ifthen_delete);
if (!ontrue && !onfalse) {
/* because it is invalid */
mem_d(self);
return NULL;
}
ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_ifthen_codegen);
self->cond = cond;
self->on_true = ontrue;
self->on_false = onfalse;
return self;
}
void ast_ifthen_delete(ast_ifthen *self)
{
ast_unref(self->cond);
ast_unref(self->on_true);
ast_unref(self->on_false);
mem_d(self);
}
ast_store* ast_store_new(lex_ctx ctx, int op,
ast_value *dest, ast_expression *source)
{
@ -343,3 +368,9 @@ bool ast_entfield_codegen(ast_entfield *self, ast_function *func, bool lvalue, i
{
return false;
}
bool ast_ifthen_codegen(ast_ifthen *self, ast_function *func, bool lvalue, ir_value **out)
{
if (out) *out = NULL;
return false;
}

25
ast.h
View file

@ -37,6 +37,7 @@ 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
*/
@ -180,6 +181,30 @@ 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**);
/* Blocks
*
*/