https://bugs.llvm.org/show_bug.cgi?id=45775
Bug ID: 45775
Summary: Differences in DWARF line number info between directly
generated and assembled object files
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: LLVM assembly language parser
Assignee: unassignedb...@nondot.org
Reporter: wolfgang_p...@playstation.sony.com
CC: llvm-bugs@lists.llvm.org
The following source, when compiled directly to an object file vs. when first
compiled to an assembly file, and then assembled, produces different line
number information.
struct Ctx
{
int m1;
int m2;
};
static Ctx States[2] =
{
{0, 1}, {2, 3}
};
int getType(struct s* myS);
int foo(struct s* myS)
{
int type = getType(myS);
if (type != -1) {
return States[type].m2;
}
return 0;
}
The difference can be demonstrated with the following script:
#!/bin/sh
clang -g -O2 -c test.cpp -o test.o
clang -g -O2 -S test.cpp -o test.s
clang -g -c test.s -o test.assembled.o
objdump -WliarfsoR test.o > 1
objdump -WliarfsoR test.assembled.o > 2
diff 1 2
I'm seeing the following differences:
265c237
< Length: 87
---
> Length: 88
319,322c291,295
< [0x00000053] Advance Line by 20 to 20
< [0x00000055] Special opcode 33: advance Address by 2 to 0x18 and Line by 0
to 20
< [0x00000056] Advance PC by 2 to 0x1a
< [0x00000058] Extended opcode 1: End of Sequence
---
> [0x00000053] Set is_stmt to 1
> [0x00000054] Advance Line by 20 to 20
> [0x00000056] Special opcode 33: advance Address by 2 to 0x18 and Line by 0
> to 20
> [0x00000057] Advance PC by 2 to 0x1a
> [0x00000059] Extended opcode 1: End of Sequence
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