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[doc] Update the description about ENTRY_BLOCK_PTR and EXIT_BLOCK_PTR

Message ID AANLkTinDQuEXcgCAN=Hkv3Lp2CAJBbfWDNxiEzxGQV7i@mail.gmail.com
State New
Headers show

Commit Message

Mingjie Xing Feb. 25, 2011, 5:19 a.m. UTC 
Hi,

This patch updates the description about ENTRY_BLOCK_PTR and
EXIT_BLOCK_PTR, since their index numbers are no longer negative now.

Is it OK?

Thanks,
Mingjie

ChangeLog,
2011-02-25  Mingjie Xing  <mingjie.xing@gmail.com>

        * doc/cfg.texi (ENTRY_BLOCK_PTR, EXIT_BLOCK_PTR): Update the
        description about their index numbers.
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Patch

Index: doc/cfg.texi
===================================================================
--- doc/cfg.texi        (revision 170165)
+++ doc/cfg.texi        (working copy)
@@ -67,8 +67,8 @@  blocks.  The index for any block should
 Special basic blocks represent possible entry and exit points of a
 function.  These blocks are called @code{ENTRY_BLOCK_PTR} and
 @code{EXIT_BLOCK_PTR}.  These blocks do not contain any code, and are
-not elements of the @code{BASIC_BLOCK} array.  Therefore they have
-been assigned unique, negative index numbers.
+always in the CFG.  They are assigned unique index numbers 0 and 1
+respectively.  Therefore @code{NUM_FIXED_BLOCKS} are 2.

 Each @code{basic_block} also contains pointers to the first
 instruction (the @dfn{head}) and the last instruction (the @dfn{tail})