Subject says all. Will commit as obvious. * tree.def (CASE_LABEL_EXPR): Fix documentation, mention all operands. * tree-cfg.c (edge_to_cases): Fix documentation.
Index: tree.def =================================================================== --- tree.def (revision 186526) +++ tree.def (working copy) @@ -876,10 +876,16 @@ DEFTREECODE (LOOP_EXPR, "loop_expr", tcc_statement of all the cases. */ DEFTREECODE (SWITCH_EXPR, "switch_expr", tcc_statement, 3) -/* Used to represent a case label. The operands are CASE_LOW and - CASE_HIGH, respectively. If CASE_LOW is NULL_TREE, the label is a - 'default' label. If CASE_HIGH is NULL_TREE, the label is a normal case - label. CASE_LABEL is the corresponding LABEL_DECL. */ +/* Used to represent a case label. + + Operand 0 is CASE_LOW. It may be NULL_TREE, in which case the label + is a 'default' label. + Operand 1 is CASE_HIGH. If it is NULL_TREE, the label is a simple + (one-value) case label. If it is non-NULL_TREE, the case is a range. + Operand 2 is CASE_LABEL, which is is the corresponding LABEL_DECL. + Operand 4 is CASE_CHAIN. This operand is only used in tree-cfg.c to + speed up the lookup of case labels which use a particular edge in + the control flow graph. */ DEFTREECODE (CASE_LABEL_EXPR, "case_label_expr", tcc_statement, 4) /* Used to represent an inline assembly statement. ASM_STRING returns a Index: tree-cfg.c =================================================================== --- tree-cfg.c (revision 186526) +++ tree-cfg.c (working copy) @@ -56,7 +56,7 @@ static const int initial_cfg_capacity = 20; /* This hash table allows us to efficiently lookup all CASE_LABEL_EXPRs which use a particular edge. The CASE_LABEL_EXPRs are chained together - via their TREE_CHAIN field, which we clear after we're done with the + via their CASE_CHAIN field, which we clear after we're done with the hash table to prevent problems with duplication of GIMPLE_SWITCHes. Access to this list of CASE_LABEL_EXPRs allows us to efficiently