Robert Mykland
2006-Oct-25 22:00 UTC
[LLVMdev] Some basic questions about LLVM version 1.8 bytecode format
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I generated LLVM bytecode for a "hello world!" program just to get the
basic bytecode structure. I have a few questions about the global info
module and the global constants module where there have apparently been
changes since 1.4. I would be happy to collect these differences and
do an edit pass of the bytecode spec once my decoder is fully
up-to-snuff again. I've put an annotated bytecode file after my
questions to illustrate what I'm trying to sort out about the
bytecode.<br>
<br>
1) In the global info module, it looks like an extra bit has been added
to global and function definitions. I'm just guessing this because it
appears to make the type slot info work out. What is the extra bit
for? In this simple example, it appears to always be 1.<br>
<br>
2) There are only two function calls in this little file, and the first
one decodes fine, but the second one appears to have the wrong type
slot information. Just a guess: is this type slot info maybe always
the actual function type slot minus 1 instead of the slot of the
pointer to the function?<br>
<br>
3) Looks like library dependencies section is empty even though I would
be expecting libc to be here. Unused?<br>
<br>
4) Looks like constant strings are initialized in the constants section
now, since it looks like this section ID stuff in the globals module is
not used or has changed? Also, I'm finding my constant string is
definitely in the constants section when I expected to find just a type
slot number.<br>
<br>
5) Again looks like the function pointer type wants to be 0x12 instead
of 0x11 here?<br>
<br>
6) After this my decode of the last few bytes of the constants section
just started to break down. Any insight you can give me re the meaning
of these last few bytes in the constants module would be appreciated.<br>
<br>
Here's the bytecode file I'm looking at (annotated). Interesting bits
are marked with five question marks:<br>
<br>
<font face="Courier New, Courier, monospace"
size="-1">Signature = llvc0<br>
00000000 6c 6c 76 63 30<br>
<br>
Module block ID = 0x01 and size = 0x0a3<br>
01 00 00 00 a3 00 00 00<br>
<br>
Format information<br>
50 = 01010000<br>
^ Target is little endian<br>
^- Target pointers are 32-bit<br>
^-- Target has endianess<br>
^--- Target has pointer size<br>
^^^^---- Bytecode format 5<br>
<br>
***********************************************************<br>
<br>
Global type pool ID = 0x06 and size = 0x014<br>
86 02 |llvc0........P..|<br>
00000010 00 00<br>
<br>
Global type pool<br>
<br>
Number of definitions = 7<br>
07<br>
<br>
0x0d = Pointer to array of sbyte[18]<br>
10 0e<br>
<br>
0x0e = Array of sbyte[18]<br>
0f 03 12<br>
<br>
0x0f = Pointer to function int ()<br>
10 10<br>
<br>
0x10 = Function int ()<br>
0d 07 00<br>
<br>
0x11 = Pointer to function int ( sbyte*, ... )<br>
10 13<br>
<br>
0x12 = Pointer to sbyte<br>
10 |................|<br>
00000020 03<br>
<br>
0x13 = Function int ( sbyte*, ... )<br>
0d 07 02 12 00<br>
<br>
***********************************************************<br>
<br>
Module globals info ID = 0x05 and size = 0x01e<br>
c5 03 00 00<br>
<br>
Global definition<br>
af 03 = 0000001110101111<br>
^ Is a constant<br>
^- Has an initializer<br>
^^^-- Linkage = internal<br>
^----- ????? <--- see question #1<br>
^^^^^^^^^^------ Type slot = sbyte[18]<br>
01 = Value slot number of the initializer <br>
<br>
End of globals<br>
00<br>
<br>
Function definition<br>
e1 03 |................| = 0000001111100001<br>
^^^^ Calling convention = 1<br>
^---- Internal<br>
^----- ????? <--- see
question #1<br>
^^^^^^^^^^------ Type slot = int (*)()<br>
<br>
Function definition<br>
00000030 b1 04 = 0000010010110001<br>
^^^^ Calling convention = 1<br>
^---- External<br>
^----- ????? <--- see question #1<br>
^^^^^^^^^^------ Type slot = 0x012 = sbyte*?????
<--- see question #2<br>
<br>
End of functions<br>
00<br>
<br>
Depends on no libraries????? <--- see question #3<br>
00<br>
<br>
Target triple = "i686-pc-linux-gnu"<br>
11 69 36 38 36 2d 70 63 2d 6c 69 6e |.....i686-pc-lin|<br>
00000040 75 78 2d 67 6e 75<br>
<br>
Section strings for globals: none????? <----- see question #4<br>
00<br>
<br>
Inline asm block: none<br>
00<br>
<br>
***********************************************************<br>
<br>
Module constant pool ID = 0x03 and size = 0x01f<br>
e3 03 00 00<br>
<br>
Module constant pool<br>
<br>
One constant string sbyte[18] = "Hello RKM world!\n" ????? <--- see
question #4<br>
01 00 0e 48 |ux-gnu.........H|<br>
00000050 65 6c 6c 6f 20 52 4b 4d 20 77 6f 72 6c 64 21 0a |ello RKM
world!.|<br>
00000060 00<br>
<br>
One constant sbyte*????? <--- see question #5<br>
01 12 04 1a<br>
<br>
One constant pointer to array of sbyte[18] = NULL????? <--- see
question #6<br>
01 0d 00<br>
<br>
????? <--- see question #6<br>
07 00 06<br>
<br>
***********************************************************<br>
<br>
Function definition ID = 0x02 and size = 0x023<br>
62 04 00 00<br>
<br>
Function definition<br>
00 |...........b....|<br>
00000070 27 01 00 00 74 11 02 01 01 05 07 00 00 24 02 00
|'...t........$..|<br>
00000080 00 00 01 0c 00 05 65 6e 74 72 79 01 07 01 03 74
|......entry....t|<br>
00000090 6d 70<br>
<br>
***********************************************************<br>
<br>
Symbol table ID = 0x04 and size = 0x1a<br>
44 03 00 00 00 01 11 01 06 70 72 69 6e 74 |mpD........print|<br>
000000a0 66 01 0f 01 04 6d 61 69 6e 01 0d 01 03 73 74 72
|f....main....str|<br>
000000b0<br>
<br>
</font>
<pre class="moz-signature" cols="72">--
Robert Mykland Voice: (831) 462-6725
Founder/CTO Ascenium Corporation
"A new world of computing fulfilling people's lives"</pre>
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Reid Spencer
2006-Oct-26 00:01 UTC
[LLVMdev] Some basic questions about LLVM version 1.8 bytecode format
Hi Robert, On Wed, 2006-10-25 at 16:00 -0600, Robert Mykland wrote:> I generated LLVM bytecode for a "hello world!" program just to get the > basic bytecode structure. I have a few questions about the global > info module and the global constants module where there have > apparently been changes since 1.4.Okay.> I would be happy to collect these differences and do an edit pass of > the bytecode spec once my decoder is fully up-to-snuff again.Great!> I've put an annotated bytecode file after my questions to illustrate > what I'm trying to sort out about the bytecode.Very nice.> > 1) In the global info module, it looks like an extra bit has been > added to global and function definitions. I'm just guessing this > because it appears to make the type slot info work out. What is the > extra bit for? In this simple example, it appears to always be 1.Bits 5 and higher are used for the slot table index. There is no special significance. If you're seeing them all be 1, then you're only looking at the ones with odd slot numbers (since bit 5 is the least significant bit in the slot number). There is one special case. If the linkage field is internal (value 3) and the initializer field is 0 (false) then it indicates that the global uses an extension word for its info. This is necessary if it has a non-zero alignment or a section. Unfortunately, I don't think this is currently documented. See lib/Bytecode/Writer at line 980 for the logic.> > 2) There are only two function calls in this little file, and the > first one decodes fine, but the second one appears to have the wrong > type slot information. Just a guess: is this type slot info maybe > always the actual function type slot minus 1 instead of the slot of > the pointer to the function?Slot 0 is reserved for arrays of sbyte .. an optimization for strings.> 3) Looks like library dependencies section is empty even though I > would be expecting libc to be here. Unused?Completely depends on your source language compiler. Its quite valid for it to be empty. If it was generated with an old llvm-gcc3 its possible that the deplibs feature is not in your version of llvm-gcc3. Either that or it doesn't depend on libc? I can't tell .. don't know how your bytecode file was created.> 4) Looks like constant strings are initialized in the constants > section now, since it looks like this section ID stuff in the globals > module is not used or has changed?It is used. See the code I mentioned above.> Also, I'm finding my constant string is definitely in the constants > section when I expected to find just a type slot number.Constant strings are handled specially. Instead of having a bunch of values in the "sbyte" slot (one for each character), which was the original design, we now detect constant array of sbyte as a special case, assign its type as slot 0 and write the entire string of characters as the value (instead of a value for each char).> 5) Again looks like the function pointer type wants to be 0x12 instead > of 0x11 here?I'm not following this question.> > 6) After this my decode of the last few bytes of the constants section > just started to break down. Any insight you can give me re the > meaning of these last few bytes in the constants module would be > appreciated.Have you used llvm-bcanalyzer to read your bytecode files? It might help you with your analysis.> > Here's the bytecode file I'm looking at (annotated). Interesting bits > are marked with five question marks: > > Signature = llvc0 > 00000000 6c 6c 76 63 30 > > Module block ID = 0x01 and size = 0x0a3 > 01 00 00 00 a3 00 00 00 > > Format information > 50 = 01010000 > ^ Target is little endian > ^- Target pointers are 32-bit > ^-- Target has endianess > ^--- Target has pointer size > ^^^^---- Bytecode format 5 > > *********************************************************** > > Global type pool ID = 0x06 and size = 0x014 > 86 02 |llvc0........P..| > 00000010 00 00 > > Global type pool > > Number of definitions = 7 > 07 > > 0x0d = Pointer to array of sbyte[18] > 10 0e > > 0x0e = Array of sbyte[18] > 0f 03 12 > > 0x0f = Pointer to function int () > 10 10 > > 0x10 = Function int () > 0d 07 00 > > 0x11 = Pointer to function int ( sbyte*, ... ) > 10 13 > > 0x12 = Pointer to sbyte > 10 |................| > 00000020 03 > > 0x13 = Function int ( sbyte*, ... ) > 0d 07 02 12 00 > > *********************************************************** > > Module globals info ID = 0x05 and size = 0x01e > c5 03 00 00 > > Global definition > af 03 = 0000001110101111 > ^ Is a constant > ^- Has an initializer > ^^^-- Linkage = internal > ^----- ????? <--- see question #1There's nothing special about this bit, its part of the slot number.> ^^^^^^^^^^------ Type slot = sbyte[18] > 01 = Value slot number of the initializer > > End of globals > 00 > > Function definition > e1 03 |................| = 0000001111100001 > ^^^^ Calling convention = 1 > ^---- Internal > ^----- ????? <--- see question > #1Same thing. Part of the slot number.> ^^^^^^^^^^------ Type slot = int (*)() > > Function definition > 00000030 b1 04 = 0000010010110001 > ^^^^ Calling convention = 1 > ^---- External > ^----- ????? <--- see question #1 > ^^^^^^^^^^------ Type slot = 0x012 = sbyte*????? > <--- see question #2 > > End of functions > 00 > > Depends on no libraries????? <--- see question #3 > 00 > > Target triple = "i686-pc-linux-gnu" > 11 69 36 38 36 2d 70 63 2d 6c 69 6e |.....i686-pc-lin| > 00000040 75 78 2d 67 6e 75 > > Section strings for globals: none????? <----- see question #4 > 00I don't think I understand the question here.> > Inline asm block: none > 00 > > *********************************************************** > > Module constant pool ID = 0x03 and size = 0x01f > e3 03 00 00 > > Module constant pool > > One constant string sbyte[18] = "Hello RKM world!\n" ????? <--- see > question #4 > 01 00 0e 48 |ux-gnu.........H| > 00000050 65 6c 6c 6f 20 52 4b 4d 20 77 6f 72 6c 64 21 0a |ello RKM > world!.| > 00000060 00Yes, this is the value of the sbyte[18].> > One constant sbyte*????? <--- see question #5 > 01 12 04 1a > > One constant pointer to array of sbyte[18] = NULL????? <--- see > question #6 > 01 0d 00 > > ????? <--- see question #6 > 07 00 06 > > *********************************************************** > > Function definition ID = 0x02 and size = 0x023 > 62 04 00 00 > > Function definition > 00 |...........b....| > 00000070 27 01 00 00 74 11 02 01 01 05 07 00 00 24 02 00 > |'...t........$..| > 00000080 00 00 01 0c 00 05 65 6e 74 72 79 01 07 01 03 74 > |......entry....t| > 00000090 6d 70 > > *********************************************************** > > Symbol table ID = 0x04 and size = 0x1a > 44 03 00 00 00 01 11 01 06 70 72 69 6e 74 |mpD........print| > 000000a0 66 01 0f 01 04 6d 61 69 6e 01 0d 01 03 73 74 72 | > f....main....str| > 000000b0 > > -- > Robert Mykland Voice: (831) 462-6725 > Founder/CTO Ascenium Corporation > "A new world of computing fulfilling people's lives" > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
Robert Mykland
2006-Oct-26 20:23 UTC
[LLVMdev] Some basic questions about LLVM version 1.8 bytecode format
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Hi Reid,<br>
<br>
Thanks for your prompt response and thanks to both you and Chris for
your patient help with my dumb and occasionally downright crazy
questions.<br>
<br>
As usual, I am being dense and more questions or clarifications of my
questions are interspersed below:<br>
<br>
Reid Spencer wrote:
<blockquote cite="mid1161820879.32005.43.camel@bashful.x10sys.com"
type="cite">
<pre wrap="">Hi Robert,
On Wed, 2006-10-25 at 16:00 -0600, Robert Mykland wrote:
</pre>
<blockquote type="cite">
<pre wrap="">I generated LLVM bytecode for a "hello
world!" program just to get the
basic bytecode structure. I have a few questions about the global
info module and the global constants module where there have
apparently been changes since 1.4.
</pre>
</blockquote>
<pre wrap=""><!---->
Okay.
</pre>
<blockquote type="cite">
<pre wrap=""> I would be happy to collect these differences
and do an edit pass of
the bytecode spec once my decoder is fully up-to-snuff again.
</pre>
</blockquote>
<pre wrap=""><!---->
Great!
</pre>
<blockquote type="cite">
<pre wrap="">I've put an annotated bytecode file after
my questions to illustrate
what I'm trying to sort out about the bytecode.
</pre>
</blockquote>
<pre wrap=""><!---->
Very nice.
</pre>
<blockquote type="cite">
<pre wrap="">1) In the global info module, it looks like an
extra bit has been
added to global and function definitions. I'm just guessing this
because it appears to make the type slot info work out. What is the
extra bit for? In this simple example, it appears to always be 1.
</pre>
</blockquote>
<pre wrap=""><!---->
Bits 5 and higher are used for the slot table index. There is no special
significance. If you're seeing them all be 1, then you're only looking
at the ones with odd slot numbers (since bit 5 is the least significant
bit in the slot number).
There is one special case. If the linkage field is internal (value 3)
and the initializer field is 0 (false) then it indicates that the global
uses an extension word for its info. This is necessary if it has a
non-zero alignment or a section. Unfortunately, I don't think this is
currently documented. See lib/Bytecode/Writer at line 980 for the logic.
</pre>
</blockquote>
The extension word part is in fact documented in the current bytecode
spec. <br>
<br>
Here's my problem. Referring to the areas of my bytecode example below
that say "see question #1", when I decode the slot numbers starting
from bit 5 as you say, I get 0x01d for the first type slot, 0x025 for
the second type slot, etc. My problem is that the way I've decoded
them my type slots end at 0x013, so I don't have a slot 0x01d or a slot
0x025. It could be I'm decoding my global types table wrong, but it is
appearing to decode as it has since the early days of LLVM. If I
assume bit 5 is some other junk and start looking for a type slot
starting at bit 6, it appears to match up better (global string is the
correct type, function is a function type, etc.).<br>
<br>
If I should really be starting with bit five, can you give me an
example of how one of these globals points to its type table entry?<br>
<blockquote cite="mid1161820879.32005.43.camel@bashful.x10sys.com"
type="cite">
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">2) There are only two function calls in this
little file, and the
first one decodes fine, but the second one appears to have the wrong
type slot information. Just a guess: is this type slot info maybe
always the actual function type slot minus 1 instead of the slot of
the pointer to the function?
</pre>
</blockquote>
<pre wrap=""><!---->
Slot 0 is reserved for arrays of sbyte .. an optimization for strings.
</pre>
</blockquote>
I think I understand the part about the strings. Here I'm talking
about the portion of my decoded bytecode example below that says "see
question #2." This refers to the second function, whose type slot
appears to decode either as type slot 0x012 or type slot 0x025
depending on whether you start from bit five or bit six. In either
case , it doesn't appear to point to a function pointer type slot like
the other function does. This could be explained if my interpretation
of my type table below is messed up.<br>
<blockquote cite="mid1161820879.32005.43.camel@bashful.x10sys.com"
type="cite">
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">3) Looks like library dependencies section is
empty even though I
would be expecting libc to be here. Unused?
</pre>
</blockquote>
<pre wrap=""><!---->
Completely depends on your source language compiler. Its quite valid for
it to be empty. If it was generated with an old llvm-gcc3 its possible
that the deplibs feature is not in your version of llvm-gcc3. Either
that or it doesn't depend on libc? I can't tell .. don't know how
your
bytecode file was created.
</pre>
<blockquote type="cite">
<pre wrap="">4) Looks like constant strings are initialized
in the constants
section now, since it looks like this section ID stuff in the globals
module is not used or has changed?
</pre>
</blockquote>
<pre wrap=""><!---->
It is used. See the code I mentioned above.
</pre>
</blockquote>
Here I'm referring to the Module Global Info section of the current
bytecode spec. In this section the sixth entry in the Module Global
Info is described as "A length list
of strings that defines a table of section strings for globals. A
global's
SectionID is an index into this table." In this example, this table
now appears to be empty. Sounds like constant strings were at one time
stored here, but now in this example I'm seeing them in the actual
separate constants section. Am I misunderstanding? Are these
different strings other than the ones now appearing in the constants
section?<br>
<blockquote cite="mid1161820879.32005.43.camel@bashful.x10sys.com"
type="cite">
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap=""> Also, I'm finding my constant string is
definitely in the constants
section when I expected to find just a type slot number.
</pre>
</blockquote>
<pre wrap=""><!---->
Constant strings are handled specially. Instead of having a bunch of
values in the "sbyte" slot (one for each character), which was the
original design, we now detect constant array of sbyte as a special
case, assign its type as slot 0 and write the entire string of
characters as the value (instead of a value for each char).</pre>
</blockquote>
Okay, so now I'm always going to see the strings appear directly after
their definitions in the constants table as in the example below?<br>
<blockquote cite="mid1161820879.32005.43.camel@bashful.x10sys.com"
type="cite">
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">5) Again looks like the function pointer type
wants to be 0x12 instead
of 0x11 here?
</pre>
</blockquote>
<pre wrap=""><!---->
I'm not following this question.
</pre>
</blockquote>
On the line in the example below that says "see question #5" this
appears to be another example of what I was talking about in question
#2. It looks like again type slot 0x012 or 0x025 is being called out
for what clearly should be a function pointer type, but the entry in
the type table as I decoded it isn't a function pointer type. Can you
see where I'm going wrong in my decoding here?<br>
<blockquote cite="mid1161820879.32005.43.camel@bashful.x10sys.com"
type="cite">
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">6) After this my decode of the last few bytes
of the constants section
just started to break down. Any insight you can give me re the
meaning of these last few bytes in the constants module would be
appreciated.
</pre>
</blockquote>
<pre wrap=""><!---->
Have you used llvm-bcanalyzer to read your bytecode files? It might help
you with your analysis.
</pre>
</blockquote>
I will give this a spin and see what it does!<br>
<br>
Thanks again for all your help.<br>
<br>
Cheers,<br>
<br>
-- Robert.<br>
<blockquote cite="mid1161820879.32005.43.camel@bashful.x10sys.com"
type="cite">
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">Here's the bytecode file I'm looking at
(annotated). Interesting bits
are marked with five question marks:
Signature = llvc0
00000000 6c 6c 76 63 30
Module block ID = 0x01 and size = 0x0a3
01 00 00 00 a3 00 00 00
Format information
50 = 01010000
^ Target is little endian
^- Target pointers are 32-bit
^-- Target has endianess
^--- Target has pointer size
^^^^---- Bytecode format 5
***********************************************************
Global type pool ID = 0x06 and size = 0x014
86 02 |llvc0........P..|
00000010 00 00
Global type pool
Number of definitions = 7
07
0x0d = Pointer to array of sbyte[18]
10 0e
0x0e = Array of sbyte[18]
0f 03 12
0x0f = Pointer to function int ()
10 10
0x10 = Function int ()
0d 07 00
0x11 = Pointer to function int ( sbyte*, ... )
10 13
0x12 = Pointer to sbyte
10 |................|
00000020 03
0x13 = Function int ( sbyte*, ... )
0d 07 02 12 00
***********************************************************
Module globals info ID = 0x05 and size = 0x01e
c5 03 00 00
Global definition
af 03 = 0000001110101111
^ Is a constant
^- Has an initializer
^^^-- Linkage = internal
^----- ????? <--- see question #1
</pre>
</blockquote>
<pre wrap=""><!---->
There's nothing special about this bit, its part of the slot number.
</pre>
<blockquote type="cite">
<pre wrap=""> ^^^^^^^^^^------ Type slot = sbyte[18]
01 = Value slot number of the initializer
End of globals
00
Function definition
e1 03 |................| = 0000001111100001
^^^^ Calling convention = 1
^---- Internal
^----- ????? <--- see question
#1
</pre>
</blockquote>
<pre wrap=""><!---->
Same thing. Part of the slot number.
</pre>
<blockquote type="cite">
<pre wrap=""> ^^^^^^^^^^------
Type slot = int (*)()
Function definition
00000030 b1 04 = 0000010010110001
^^^^ Calling convention = 1
^---- External
^----- ????? <--- see question #1
^^^^^^^^^^------ Type slot = 0x012 = sbyte*?????
<--- see question #2
End of functions
00
Depends on no libraries????? <--- see question #3
00
Target triple = "i686-pc-linux-gnu"
11 69 36 38 36 2d 70 63 2d 6c 69 6e |.....i686-pc-lin|
00000040 75 78 2d 67 6e 75
Section strings for globals: none????? <----- see question #4
00
</pre>
</blockquote>
<pre wrap=""><!---->
I don't think I understand the question here.
</pre>
<blockquote type="cite">
<pre wrap="">Inline asm block: none
00
***********************************************************
Module constant pool ID = 0x03 and size = 0x01f
e3 03 00 00
Module constant pool
One constant string sbyte[18] = "Hello RKM world!\n" ????? <--- see
question #4
01 00 0e 48 |ux-gnu.........H|
00000050 65 6c 6c 6f 20 52 4b 4d 20 77 6f 72 6c 64 21 0a |ello RKM
world!.|
00000060 00
</pre>
</blockquote>
<pre wrap=""><!---->
Yes, this is the value of the sbyte[18].
</pre>
<blockquote type="cite">
<pre wrap="">One constant sbyte*????? <--- see question
#5
01 12 04 1a
One constant pointer to array of sbyte[18] = NULL????? <--- see
question #6
01 0d 00
????? <--- see question #6
07 00 06
***********************************************************
Function definition ID = 0x02 and size = 0x023
62 04 00 00
Function definition
00 |...........b....|
00000070 27 01 00 00 74 11 02 01 01 05 07 00 00 24 02 00
|'...t........$..|
00000080 00 00 01 0c 00 05 65 6e 74 72 79 01 07 01 03 74
|......entry....t|
00000090 6d 70
***********************************************************
Symbol table ID = 0x04 and size = 0x1a
44 03 00 00 00 01 11 01 06 70 72 69 6e 74 |mpD........print|
000000a0 66 01 0f 01 04 6d 61 69 6e 01 0d 01 03 73 74 72 |
f....main....str|
000000b0
--
Robert Mykland Voice: (831) 462-6725
Founder/CTO Ascenium Corporation
"A new world of computing fulfilling people's lives"
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