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author | Andrew Cagney <cagney@redhat.com> | 2001-08-21 00:24:58 +0000 |
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committer | Andrew Cagney <cagney@redhat.com> | 2001-08-21 00:24:58 +0000 |
commit | 1c72f9b0c41ef5de822fce0d6faed9c69d40a589 (patch) | |
tree | 84904537e7a250b24a570a8c43ce4272de4ad383 /gdb/gdbtypes.h | |
parent | ca3f769514c0a9d770848a21267b29236225252f (diff) | |
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* gdbtypes.h (struct type): Clarify meaning of field ``length''.
Diffstat (limited to 'gdb/gdbtypes.h')
-rw-r--r-- | gdb/gdbtypes.h | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/gdb/gdbtypes.h b/gdb/gdbtypes.h index bc0f8fb..6869a60 100644 --- a/gdb/gdbtypes.h +++ b/gdb/gdbtypes.h @@ -231,13 +231,17 @@ struct type char *tag_name; - /* Length of storage for a value of this type. Various places pass - this to memcpy and such, meaning it must be in units of - HOST_CHAR_BIT. Various other places expect they can calculate - addresses by adding it and such, meaning it must be in units of + /* Length of storage for a value of this type. This is of length + of the type as defined by the debug info and not the length of + the value that resides within the type. For instance, an + i386-ext floating-point value only occupies 80 bits of what is + typically a 12 byte `long double'. Various places pass this to + memcpy and such, meaning it must be in units of HOST_CHAR_BIT. + Various other places expect they can calculate addresses by + adding it and such, meaning it must be in units of TARGET_CHAR_BIT. For some DSP targets, in which HOST_CHAR_BIT - will (presumably) be 8 and TARGET_CHAR_BIT will be (say) 32, this - is a problem. One fix would be to make this field in bits + will (presumably) be 8 and TARGET_CHAR_BIT will be (say) 32, + this is a problem. One fix would be to make this field in bits (requiring that it always be a multiple of HOST_CHAR_BIT and TARGET_CHAR_BIT)--the other choice would be to make it consistently in units of HOST_CHAR_BIT. */ |