ELF Binary Comparison

Overview

Binaries
Resource Consumption
Symbols
- Persisting
- Disappeared
- Appeared
- Similar
- Migrated

Binaries ↩

old: ../../tests/x86_64/libelf_diff_test2_debug_old.a (debug)

new: ../../tests/x86_64/libelf_diff_test2_debug_new.a (debug)

Statistics ↩

Program Storage

	Old/bytes	New/bytes	Delta/bytes
overall	439	450	11
text	403	414	11
data	36	36	0

Static RAM

	Old/bytes	New/bytes
overall	36	36
data	36	36
bss	0	0

Legend

text	instructions
data	initialized global or static variables
bss	uninitialized global or static variables

Symbol Classes

Class	Entities
Old	17
New	17
Persisting	11
Disappeared	6
Appeared	6
Similar	16
Migrated	5

Symbol Selection

	Old Binary	New Binary
Total	17	17
Selected	17	17
Dropped	0	0
Selection Regex	.*	.*
Exclusion Regex

Symbols ↩

Persisting Symbols ↩

Symbol	Type	Old Size/bytes	New Size/bytes	Delta/bytes
implementationChanged(int) ⓘ	T	98	106	8
g() ⓘ	T	11	11	0
fIStay(double) ⓘ	T	30	30	0
cIStayButDiffer	r	4	4	0
cIStay	r	4	4	0
Test::smvIStayButDiffer	D	4	4	0
Test::smvIStay	D	4	4	0
g()::lsvIStayButDiffer	d	4	4	0
g()::lsvIStay	d	4	4	0
vIStay	D	4	4	0
vIStayButDiffer	D	4	4	0

Columns

Symbol	The symbol name (possibly mangled)
Type	The symbol type (see the documentation of binutils tool nm for more information)
Old Size	The old symbol size either in RAM or program memory
New Size	The new symbol size either in RAM or program memory
Delta	The change to symbol size

Disappeared Symbols ↩

Symbol	Type	Size/bytes
fIStayButDiffer(float) ⓘ	T	20
fIAmGone(int) ⓘ	T	16
cIAmGone	r	4
Test::smvIAmGone	D	4
g()::lsvIAmGone	d	4
vIAmGone	D	4

Columns

Symbol	The symbol name (possibly demangled)
Type	The symbol type (see the documentation of binutils tool nm for more information)
Size	The symbol size either in RAM or program memory

New Symbols ↩

Symbol	Type	Size/bytes
fIAmNew(short) ⓘ	T	20
fIStayButDiffer(char) ⓘ	T	19
cIAmNew	r	4
Test::smvIAmNew	D	4
g()::lsvIAmNew	d	4
vIAmNew	D	4

Columns

Symbol	The symbol name (possibly demangled)
Type	The symbol type (see the documentation of binutils tool nm for more information)
Size	The symbol size either in RAM or program memory

Similar Symbols ↩

Id	Symbols	Types	Sizes/bytes	Deltas/bytes	Sig. Sim./%	Instr. Sim./%
0 ⓘ	fIStayButDiffer(float) fIStayButDiffer(char)	T T	20 19	-1	95.0	84.3
1	fIStayButDiffer(float) cIStayButDiffer	T r	20 4	-16	90.0	0.0
2	Test::smvIAmGone Test::smvIAmNew	D D	4 4	0	80.0	100.0
3	fIStayButDiffer(float) vIStayButDiffer	T D	20 4	-16	80.0	0.0
4	g()::lsvIAmGone g()::lsvIAmNew	d d	4 4	0	77.8	100.0
5	fIStayButDiffer(float) g()::lsvIStayButDiffer	T d	20 4	-16	73.9	0.0
6	fIStayButDiffer(float) Test::smvIStayButDiffer	T D	20 4	-16	70.8	0.0
7	cIAmGone cIAmNew	r r	4 4	0	69.6	100.0
8	Test::smvIAmGone Test::smvIStay	D D	4 4	0	66.7	100.0
9	vIAmGone vIAmNew	D D	4 4	0	66.7	100.0
10	g()::lsvIAmGone g()::lsvIStay	d d	4 4	0	62.9	100.0
11	Test::smvIAmGone Test::smvIStayButDiffer	D D	4 4	0	61.2	100.0
12 ⓘ	fIAmGone(int) fIAmNew(short)	T T	16 20	4	60.9	89.7
13	g()::lsvIAmGone g()::lsvIStayButDiffer	d d	4 4	0	57.8	100.0
14	cIAmGone fIAmNew(short)	r T	4 20	16	52.2	0.0
15	fIAmGone(int) cIAmNew	T r	16 4	-12	52.2	0.0

Columns

ID	Integer id assigned to each symbol pair
Symbols	The two similar symbol names (possibly mangled)
Types	The symbol types (see the documentation of binutils tool nm for more information)
Sizes	The sizes of the symbols either in RAM or program memory
Deltas	The difference in symbol size
Sig. Sim.	Lexicographic symbol signature similarity
Instr. Sim.	Instruction similarity of the symbols' assembly code

Migrated Symbols ↩

Symbol	Old Source Location	New Source Location
g() ⓘ	old/test2.cpp:32(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)	new/test2.cpp:32(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)
fIStay(double) ⓘ	old/test2.cpp:21(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)	new/test2.cpp:20(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)
vIStay	old/test2.cpp:25(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)	new/test2.cpp:24(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)
vIStayButDiffer	old/test2.cpp:26(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)	new/test2.cpp:25(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)
implementationChanged(int) ⓘ	old/test2.cpp:68(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)	new/test2.cpp:68(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)

Please Note: Use the settings source_prefix, old_source_prefix or new_source_prefix to eliminate false positives by removing path prefix from source file paths.

Columns

Symbol	The symbol name (possibly mangled)
Old Source Location	The old source file location [file:line]
New Source Location	The new source file location [file:line]

Symbol Details ↩

Persisting Symbols ↩

Persisting symbol g() : old size: 11 bytes, new size: 11 bytes, delta: 0 bytes

Old source: old/test2.cpp:32(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)
New source: new/test2.cpp:32(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)

Instructions unchanged

Persisting symbol implementationChanged(int) : old size: 98 bytes, new size: 106 bytes, delta: 8 bytes

Old source: old/test2.cpp:68(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)
New source: new/test2.cpp:68(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)

	Old			New
f	1	endbr64	f	1	endbr64
	2	push %rbp		2	push %rbp
	3	mov %rsp,%rbp		3	mov %rsp,%rbp
	4	mov %edi,-0x14(%rbp)		4	mov %edi,-0x14(%rbp)
	5	mov -0x14(%rbp),%eax		5	mov -0x14(%rbp),%eax
n			n	6	lea 0x1(%rax),%edx
				7	mov %edx,%eax
	6	add %eax,%eax		8	add %eax,%eax
n	7	add $0x3,%eax	n	9	add %edx,%eax
	8	mov %eax,-0x8(%rbp)		10	mov %eax,-0x8(%rbp)
	9	movl $0x0,-0x4(%rbp)		11	movl $0x0,-0x4(%rbp)
	10	mov -0x4(%rbp),%eax		12	mov -0x4(%rbp),%eax
	11	cmp -0x14(%rbp),%eax		13	cmp -0x14(%rbp),%eax
n	12	jge aa <_Z21implementationChangedi+0x5d>	n	14	jge b1 <_Z21implementationChangedi+0x61>
	13	mov -0x8(%rbp),%edx		15	mov -0x8(%rbp),%eax
	14	mov -0x4(%rbp),%eax		16	sub -0x4(%rbp),%eax
	15	add %edx,%eax
	16	movslq %eax,%rdx		17	movslq %eax,%rdx
n	17	imul $0x78787879,%rdx,%rdx	n	18	imul $0xffffffff88888889,%rdx,%rdx
	18	shr $0x20,%rdx		19	shr $0x20,%rdx
n			n	20	add %eax,%edx
	19	sar $0x3,%edx		21	sar $0x3,%edx
	20	mov %eax,%ecx		22	mov %eax,%ecx
	21	sar $0x1f,%ecx		23	sar $0x1f,%ecx
	22	sub %ecx,%edx		24	sub %ecx,%edx
	23	mov %edx,-0x8(%rbp)		25	mov %edx,-0x8(%rbp)
	24	mov -0x8(%rbp),%ecx		26	mov -0x8(%rbp),%ecx
	25	mov %ecx,%edx		27	mov %ecx,%edx
	26	shl $0x4,%edx		28	shl $0x4,%edx
n	27	add %ecx,%edx	n	29	sub %ecx,%edx
	28	sub %edx,%eax		30	sub %edx,%eax
	29	mov %eax,-0x8(%rbp)		31	mov %eax,-0x8(%rbp)
	30	addl $0x1,-0x4(%rbp)		32	addl $0x1,-0x4(%rbp)
t	31	jmp 6a <_Z21implementationChangedi+0x1d>	t	33	jmp 71 <_Z21implementationChangedi+0x21>
				34	addl $0x1,-0x8(%rbp)
	32	mov -0x8(%rbp),%eax		35	mov -0x8(%rbp),%eax
	33	pop %rbp		36	pop %rbp
	34	ret		37	ret
	35			38

Persisting symbol fIStay(double) : old size: 30 bytes, new size: 30 bytes, delta: 0 bytes

Old source: old/test2.cpp:21(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)
New source: new/test2.cpp:20(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)

Instructions unchanged

Disappeared Symbols ↩

Disappeared symbol fIStayButDiffer(float) : size: 20 bytes

Source: old/test2.cpp:22(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)

endbr64
push   %rbp
mov    %rsp,%rbp
movss  %xmm0,-0x4(%rbp)
movss  -0x4(%rbp),%xmm0
pop    %rbp
ret

Disappeared symbol fIAmGone(int) : size: 16 bytes

Source: old/test2.cpp:20(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)

endbr64
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0x4(%rbp)
mov    -0x4(%rbp),%eax
pop    %rbp
ret

New Symbols ↩

Appeared symbol fIStayButDiffer(char) : size: 19 bytes

Source: new/test2.cpp:21(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)

endbr64
push   %rbp
mov    %rsp,%rbp
mov    %edi,%eax
mov    %al,-0x4(%rbp)
movzbl -0x4(%rbp),%eax
pop    %rbp
ret

Appeared symbol fIAmNew(short) : size: 20 bytes

Source: new/test2.cpp:22(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)

endbr64
push   %rbp
mov    %rsp,%rbp
mov    %edi,%eax
mov    %ax,-0x4(%rbp)
movzwl -0x4(%rbp),%eax
pop    %rbp
ret

Similar Symbols ↩

Similar pair 0 : old size: 20 bytes, new size: 19 bytes, delta: -1 bytes, sig. sim.: 95.0 %, instr. sim.: 84.3 %

Old: fIStayButDiffer(float) [old/test2.cpp:22(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)]
New: fIStayButDiffer(char) [new/test2.cpp:21(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)]

	Old			New
f	1	endbr64	f	1	endbr64
	2	push %rbp		2	push %rbp
	3	mov %rsp,%rbp		3	mov %rsp,%rbp
t			t	4	mov %edi,%eax
	4	movss %xmm0,-0x4(%rbp)		5	mov %al,-0x4(%rbp)
	5	movss -0x4(%rbp),%xmm0		6	movzbl -0x4(%rbp),%eax
	6	pop %rbp		7	pop %rbp
	7	ret		8	ret
	8			9

Similar pair 12 : old size: 16 bytes, new size: 20 bytes, delta: 4 bytes, sig. sim.: 60.9 %, instr. sim.: 89.7 %

Old: fIAmGone(int) [old/test2.cpp:20(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)]
New: fIAmNew(short) [new/test2.cpp:22(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)]

	Old			New
f	1	endbr64	f	1	endbr64
	2	push %rbp		2	push %rbp
	3	mov %rsp,%rbp		3	mov %rsp,%rbp
t			t	4	mov %edi,%eax
	4	mov %edi,-0x4(%rbp)		5	mov %ax,-0x4(%rbp)
	5	mov -0x4(%rbp),%eax		6	movzwl -0x4(%rbp),%eax
	6	pop %rbp		7	pop %rbp
	7	ret		8	ret
	8			9

Migrated Symbols ↩

Migrated symbol g() : old size: 11 bytes, new size: 11 bytes, delta: 0 bytes

Old source: old/test2.cpp:32(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)
New source: new/test2.cpp:32(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)

Migrated symbol implementationChanged(int) : old size: 98 bytes, new size: 106 bytes, delta: 8 bytes

Old source: old/test2.cpp:68(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)
New source: new/test2.cpp:68(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)

Migrated symbol fIStay(double) : old size: 30 bytes, new size: 30 bytes, delta: 0 bytes

Old source: old/test2.cpp:21(/home/flo/Documents/elf_diff/tests/src/old/test2.cpp)
New source: new/test2.cpp:20(/home/flo/Documents/elf_diff/tests/src/new/test2.cpp)