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use left recursion instead of right recursion to avoid memory exhausted issue when compiling large source files

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This commit is contained in:
Zou Nan hai 2010-04-21 11:02:21 +08:00 committed by Damien Lespiau
parent dea75a6935
commit db8aedc745
2 changed files with 26 additions and 12 deletions
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1
assembler/src/gen4asm.h
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@ -122,6 +122,7 @@ struct brw_program_instruction {
*/
struct brw_program {
struct brw_program_instruction *first;
struct brw_program_instruction *last;
};
extern struct brw_program compiled_program;

35
assembler/src/gram.y
View File

@ -174,16 +174,15 @@ ROOT: instrseq
label: STRING COLON
;
instrseq: instruction SEMICOLON instrseq
instrseq: instrseq instruction SEMICOLON
{
struct brw_program_instruction *list_entry =
calloc(sizeof(struct brw_program_instruction), 1);
list_entry->instruction = $1;
list_entry->next = $3.first;
$3.first = list_entry;
$$ = $3;
list_entry->instruction = $2;
list_entry->next = NULL;
$1.last->next = list_entry;
$1.last = list_entry;
$$ = $1;
}
| instruction SEMICOLON
{
@ -194,16 +193,30 @@ instrseq: instruction SEMICOLON instrseq
list_entry->next = NULL;
$$.first = list_entry;
$$.last = list_entry;
}
| label instrseq
| instrseq label
{
struct brw_program_instruction *list_entry =
calloc(sizeof(struct brw_program_instruction), 1);
list_entry->string = strdup($2);
list_entry->islabel = 1;
list_entry->next = NULL;
$1.last->next = list_entry;
$1.last = list_entry;
$$ = $1;
}
| label
{
struct brw_program_instruction *list_entry =
calloc(sizeof(struct brw_program_instruction), 1);
list_entry->string = strdup($1);
list_entry->islabel = 1;
list_entry->next = $2.first;
$2.first = list_entry;
$$ = $2;
list_entry->next = NULL;
$$.first = list_entry;
$$.last = list_entry;
}
| error SEMICOLON instrseq
{