(jump_optimize): Ensure operand of REG_NOTES is an INSN; otherwise, we

might try to read outside allocated memory.

From-SVN: r2684

diff --git a/gcc/jump.c b/gcc/jump.c
index 63f531311154b6a9aae01863ff52861724777665..5ed2828d531c8765bfd9360d1e7e402a01c91bb9 100644 (file)
--- a/gcc/jump.c
+++ b/gcc/jump.c
@@ -837,6 +837,7 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
              && this_is_condjump && ! this_is_simplejump
              && BRANCH_COST >= 3
              && (temp = next_nonnote_insn (insn)) != 0
+             && GET_CODE (temp) == INSN
              && REG_NOTES (temp) == 0
              && (reallabelprev == temp
                  || ((temp2 = next_active_insn (temp)) != 0
@@ -874,8 +875,10 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
              && this_is_condjump && ! this_is_simplejump
              && BRANCH_COST >= 4
              && (temp = next_nonnote_insn (insn)) != 0
+             && GET_CODE (temp) == INSN
              && REG_NOTES (temp) == 0
              && (temp3 = next_nonnote_insn (temp)) != 0
+             && GET_CODE (temp3) == INSN
              && REG_NOTES (temp3) == 0
              && (reallabelprev == temp3
                  || ((temp2 = next_active_insn (temp3)) != 0
@@ -920,8 +923,10 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
              && this_is_condjump && ! this_is_simplejump
              && BRANCH_COST >= 4
              && (temp = next_nonnote_insn (insn)) != 0
+             && GET_CODE (temp) == INSN
              && REG_NOTES (temp) == 0
              && (temp3 = next_nonnote_insn (temp)) != 0
+             && GET_CODE (temp3) == INSN
              && REG_NOTES (temp3) == 0
              && (reallabelprev == temp3
                  || ((temp2 = next_active_insn (temp3)) != 0