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Yiping Fan

2005-Nov-16 02:05 UTC

[LLVMdev] Does llvm-db work?

Problem 1:
I tried llvm-db of LLVM 1.6, in the Linux environment. However, it always
prompts the following info for different tests:

=====================================:> llvm-db a.out.bc
llvm-db: The LLVM source-level debugger
Loading program... successfully loaded 'a.out.bc'!
(llvm-db) run
Starting program: a.out.bc
Error: Error waiting for the child process to stop. It exited with status 1
=====================================
I am wondering if llvm-db in 1.6 still works?


Problem 2:
I use llvm-gcc -g to compile this C program, and got the followed LLVM code
(part). It seems that debug information for some statements are missing, i.e.,
we don't know where the coressponding "+" statement is in the
source code,
from a "add" instruction in the LLVM code. Can anyone comment on this?
Thank
you very much.

=====================================short test(short br_data_0,
short br_data_1,
short br_data_2,
short br_data_3,
short br_data_4,
short br_data_5,
short br_data_6,
short br_data_7) {

short sm07 = br_data_0 + br_data_7;
short sm16 = br_data_1 + br_data_6;
short sm25 = br_data_2 + br_data_5;
short sm34 = br_data_3 + br_data_4;
short s0734 = sm07 + sm34;
short s1625 = sm16 + sm25;

return s0734 + s1625;
}
=====================================

=====================================short %test(short %br_data_0, short
%br_data_1, short %br_data_2, short
%br_data_3, short %br_data_4, short %br_data_5, short %br_data_6, short
%br_data_7) {
entry:
%dbg.1 = tail call { }* %llvm.dbg.func.start( %lldb.global* %d.test ) ; <{
}*> [#uses=1]
%dbg.tmp.1 = tail call { }* %llvm.dbg.stoppoint( { }* %dbg.1, uint 10, uint
0, %lldb.compile_unit* %d.compile_unit ) ; <{ }*> [#uses=1]
%dbg.tmp.3 = tail call { }* %llvm.dbg.stoppoint( { }* %dbg.tmp.1, uint 17,
uint 0, %lldb.compile_unit* %d.compile_unit ) ; <{ }*> [#uses=1]
%tmp.6 = add short %br_data_1, %br_data_0 ; <short> [#uses=1]
%tmp.15 = add short %tmp.6, %br_data_2 ; <short> [#uses=1]
%tmp.18 = add short %tmp.15, %br_data_3 ; <short> [#uses=1]
%tmp.12 = add short %tmp.18, %br_data_4 ; <short> [#uses=1]
%tmp.21 = add short %tmp.12, %br_data_5 ; <short> [#uses=1]
%tmp.9 = add short %tmp.21, %br_data_6 ; <short> [#uses=1]
%tmp.24 = add short %tmp.9, %br_data_7 ; <short> [#uses=1]
%dbg.tmp.7 = tail call { }* %llvm.dbg.region.end( { }* %dbg.tmp.3 ) ; <{
}*>
[#uses=0]
ret short %tmp.24
}
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Chris Lattner

2005-Nov-16 06:53 UTC

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[LLVMdev] Does llvm-db work?

On Tue, 15 Nov 2005, Yiping Fan wrote:> Problem 1:
> I tried llvm-db of LLVM 1.6, in the Linux environment. However, it always
> prompts the following info for different tests:
> I am wondering if llvm-db in 1.6 still works?
I'm looking into this.  I can reproduce the problem and it appears that it 
was lost for 1.6.  I'll come up with a patch for CVS, sorry about this! :(
> Problem 2:
> I use llvm-gcc -g to compile this C program, and got the followed LLVM code
> (part). It seems that debug information for some statements are missing,
i.e.,
> we don't know where the coressponding "+" statement is in the
source code,
> from a "add" instruction in the LLVM code. Can anyone comment on
this? Thank
> you very much.
I can also look into this, but the first is the most important.  If you 
could, please file a bugzilla bug for each of these problems.

Thanks!

-Chris
> =====================================> short test(short br_data_0,
> short br_data_1,
> short br_data_2,
> short br_data_3,
> short br_data_4,
> short br_data_5,
> short br_data_6,
> short br_data_7) {
>
> short sm07 = br_data_0 + br_data_7;
> short sm16 = br_data_1 + br_data_6;
> short sm25 = br_data_2 + br_data_5;
> short sm34 = br_data_3 + br_data_4;
> short s0734 = sm07 + sm34;
> short s1625 = sm16 + sm25;
>
> return s0734 + s1625;
> }
> =====================================>
>
> =====================================> short %test(short %br_data_0,
short %br_data_1, short %br_data_2, short
> %br_data_3, short %br_data_4, short %br_data_5, short %br_data_6, short
> %br_data_7) {
> entry:
> %dbg.1 = tail call { }* %llvm.dbg.func.start( %lldb.global* %d.test ) ;
<{
> }*> [#uses=1]
> %dbg.tmp.1 = tail call { }* %llvm.dbg.stoppoint( { }* %dbg.1, uint 10, uint
> 0, %lldb.compile_unit* %d.compile_unit ) ; <{ }*> [#uses=1]
> %dbg.tmp.3 = tail call { }* %llvm.dbg.stoppoint( { }* %dbg.tmp.1, uint 17,
> uint 0, %lldb.compile_unit* %d.compile_unit ) ; <{ }*> [#uses=1]
> %tmp.6 = add short %br_data_1, %br_data_0 ; <short> [#uses=1]
> %tmp.15 = add short %tmp.6, %br_data_2 ; <short> [#uses=1]
> %tmp.18 = add short %tmp.15, %br_data_3 ; <short> [#uses=1]
> %tmp.12 = add short %tmp.18, %br_data_4 ; <short> [#uses=1]
> %tmp.21 = add short %tmp.12, %br_data_5 ; <short> [#uses=1]
> %tmp.9 = add short %tmp.21, %br_data_6 ; <short> [#uses=1]
> %tmp.24 = add short %tmp.9, %br_data_7 ; <short> [#uses=1]
> %dbg.tmp.7 = tail call { }* %llvm.dbg.region.end( { }* %dbg.tmp.3 ) ; <{
}*>
> [#uses=0]
> ret short %tmp.24
> }
> =====================================>
-Chris

-- 
http://nondot.org/sabre/
http://llvm.org/

llvm dev - Nov 2005 - [LLVMdev] Does llvm-db work?

[LLVMdev] Does llvm-db work?

[LLVMdev] Does llvm-db work?