From 3d25afc51c1d56fe8c29147825e53ba272780360 Mon Sep 17 00:00:00 2001 From: Jason Ekstrand Date: Wed, 4 Feb 2015 21:22:45 -0800 Subject: nir: Make nir_[cf_node/instr]_[prev/next] return null if at the end Reviewed-by: Connor Abbott --- src/glsl/nir/nir.h | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-) (limited to 'src') diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h index 7f6e241..b4cccb9 100644 --- a/src/glsl/nir/nir.h +++ b/src/glsl/nir/nir.h @@ -416,15 +416,23 @@ typedef struct { } nir_instr; static inline nir_instr * -nir_instr_next(const nir_instr *instr) +nir_instr_next(nir_instr *instr) { - return exec_node_data(nir_instr, (instr)->node.next, node); + struct exec_node *next = exec_node_get_next(&instr->node); + if (exec_node_is_tail_sentinel(next)) + return NULL; + else + return exec_node_data(nir_instr, next, node); } static inline nir_instr * -nir_instr_prev(const nir_instr *instr) +nir_instr_prev(nir_instr *instr) { - return exec_node_data(nir_instr, (instr)->node.prev, node); + struct exec_node *prev = exec_node_get_prev(&instr->node); + if (exec_node_is_head_sentinel(prev)) + return NULL; + else + return exec_node_data(nir_instr, prev, node); } typedef struct { @@ -1272,13 +1280,21 @@ typedef struct { static inline nir_cf_node * nir_cf_node_next(nir_cf_node *node) { - return exec_node_data(nir_cf_node, exec_node_get_next(&node->node), node); + struct exec_node *next = exec_node_get_next(&node->node); + if (exec_node_is_tail_sentinel(next)) + return NULL; + else + return exec_node_data(nir_cf_node, next, node); } static inline nir_cf_node * nir_cf_node_prev(nir_cf_node *node) { - return exec_node_data(nir_cf_node, exec_node_get_prev(&node->node), node); + struct exec_node *prev = exec_node_get_prev(&node->node); + if (exec_node_is_head_sentinel(prev)) + return NULL; + else + return exec_node_data(nir_cf_node, prev, node); } static inline bool -- cgit v1.1