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|
# HLO Text Syntax
```yacc
hlo_module
: 'HloModule' name computations
;
/* If no computation is marked as ENTRY, the last computation will be the entry
computation of the module.*/
computations
: computation
| computation computations
;
computation
: 'ENTRY' name param_list_to_shape instruction_list
| name param_list_to_shape instruction_list
| 'ENTRY' name instruction_list
| name instruction_list
;
/* If no instruction is marked as ROOT, the last instruction will be the root of
its computation. */
instruction_list
: '{' instruction_list1 '}'
;
instruction_list1
: instruction
| instruction_list1 instruction
;
instruction
: 'ROOT' name '=' shape opcode operands extra_attributes
| name '=' shape opcode operands extra_attributes
;
operands
: '(' operands1 ')'
;
operands1
: /*empty*/
| operand
| operands1 ',' operand
;
operand
: shape name
| name
;
attributes
: /*empty*/
| ',' attribute
| ',' attribute attributes
;
attribute
: attribute_name attribute_value
;
attribute_value
: kInt
| kName
| [0-9bf]{2,}_[0-9io]{2,}->[0-9bf]{2,} /*dim_labels_pattern*/
| [0-9]+(x[0-9]+)+ /*dxd_pattern*/
| [0-9]+_[0-9]+(_[0-9]+)?(x[0-9]+_[0-9]+(_[0-9]+)?)* /*pad_pattern*/
| '{' sub_attributes '}'
;
param_list_to_shape
: param_list '->' shape
;
param_list
: '(' param_list1 ')'
;
param_list1
: /*empty*/
| param
| param_list1 ',' param
;
param
: name shape
;
shape
: shape_val_
| '(' tuple_elements ')'
;
tuple_elements
: /*empty*/
| shape (',' shape)*
;
name
: identifier ':'
| '%' identifier
| identifier
;
identifier
: [a-zA-Z_][a-zA-Z0-9_.-]*
;
/* literal is in the right hand side of a constant instruction. */
literal
: tuple
| non_tuple
;
tuple
: shape '(' literal_list ')'
;
literal_list
: /*empty*/
: literal
| literal_list ',' literal
;
non_tuple
: rank01
| rank2345
;
rank2345
: shape sparse_or_nested_array
;
sparse_or_nested_array
: sparse_array
| nested_array
;
sparse_array
: '{' sparse_array1 '}'
;
sparse_array1
: sparse_array_item
| sparse_array1 ',' sparse_array_item
;
sparse_array_item
: multi_index ':' scalar
;
multi_index
: kInt
| '[' multi_index1 ']'
;
multi_index1
: kInt
| multi_index1 ',' kInt
;
```
|
