https://llvm.org/bugs/show_bug.cgi?id=22996
Bug ID: 22996
Summary: Difference in relocations with -no-integrated-as
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: MC
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
For the following example: using direct object emission the address at 0xb does
not have a relocation, using -no-integrated-as it does have a relocation. There
is a relocation for 0x6 in both cases. Using r232386.
$ cat test.cpp
struct A {
A();
};
void fn1() {
A();
fn1();
}
$ clang -c -O2 test.cpp -o direct.o
$ objdump -d direct.o
direct.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <_Z3fn1v>:
0: 50 push %rax
1: 48 8d 3c 24 lea (%rsp),%rdi
5: e8 00 00 00 00 callq a <_Z3fn1v+0xa>
a: e8 f1 ff ff ff callq 0 <_Z3fn1v>
f: 58 pop %rax
10: c3 retq
$ objdump -r direct.o
direct.o: file format elf64-x86-64
RELOCATION RECORDS FOR [.text]:
OFFSET TYPE VALUE
0000000000000006 R_X86_64_PC32 _ZN1AC1Ev-0x0000000000000004
RELOCATION RECORDS FOR [.eh_frame]:
OFFSET TYPE VALUE
0000000000000020 R_X86_64_PC32 .text
$ clang -c -O2 test.cpp -no-integrated-as -o no_int_as.o
$ objdump -d no_int_as.o
no_int_as.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <_Z3fn1v>:
0: 50 push %rax
1: 48 8d 3c 24 lea (%rsp),%rdi
5: e8 00 00 00 00 callq a <_Z3fn1v+0xa>
a: e8 00 00 00 00 callq f <_Z3fn1v+0xf>
f: 58 pop %rax
10: c3 retq
$ objdump -r no_int_as.o
no_int_as.o: file format elf64-x86-64
RELOCATION RECORDS FOR [.text]:
OFFSET TYPE VALUE
0000000000000006 R_X86_64_PC32 _ZN1AC1Ev-0x0000000000000004
000000000000000b R_X86_64_PC32 _Z3fn1v-0x0000000000000004
RELOCATION RECORDS FOR [.eh_frame]:
OFFSET TYPE VALUE
0000000000000020 R_X86_64_PC32 .text
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