本文介绍了函数体结束时奇怪的循环调用C ++的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在用C ++编写一个游戏程序，遇到一个奇怪的问题，这个函数似乎是唯一的。当这个函数被调用时，它只执行按预期的方式通过返回语句。然而，在执行return语句时，代码将跳转两行到构造函数，并再次在构造函数和返回语句之间执行代码。此外，当我检查在第二次迭代时传递给FileManager构造函数的值，它的值为'level_directory'（但只有内部构造函数，当我检查函数调用所有内容
相关信息：
Debugger：GDB 7.6-1
操作系统：Arch Linux x86_64
IDE：Code :: Blocks 12.11
g ++ -S -masm = intel main.cpp; cat main.s | c ++ filt> disasm.s
在game.h中包含的文件：9：0，
from main.cpp：4：
playstate.h：32：45：warning：非静态数据成员初始化器只能使用-std = c ++ 11或-std = gnu ++ 11 [由...启用默认]
const std :: string level_directory =data / levels /;
.filemain.cpp
.intel_syntax noprefix
.text
.globl main
.type main，@function
main ：
.LFB1826：
.cfi_startproc
.cfi_personality 0x3，__ gxx_personality_v0
.cfi_lsda 0x3，.LLSDA1826
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6，-16
mov rbp，rsp
.cfi_def_cfa_register 6
push rbx
sub rsp，552
.cfi_offset 3，-24
lea rax，[rbp-560]
mov rdi，rax
.LEHB0：
call _ZN4GameC1Ev
.LEHE0：
jmp .L2
.L3：
lea rax，[rbp-560]
mov rdi，rax
.LEHB1：
call _ZN4Game12HandleEventsEv
lea rax，[rbp-560]
mov rdi ，rax
调用_ZN4Game6UpdateEv
lea rax，[rbp-560]
mov rdi，rax
调用_ZN4Game6RenderEv
.L2：
lea rax，[rbp -560]
mov rdi，rax
call _ZN4Game9isRunningEv
.LEHE1：
test al，al
jne .L3
lea rax，[rbp-560]
mov rdi，rax
.LEHB2：
call _ZN4GameD1Ev
。 LEHE2：
mov eax，0
jmp .L9
.L8：
mov rbx，rax
lea rax，[rbp-560]
mov rdi ，rax
调用_ZN4GameD1Ev
mov rax，rbx
jmp .L6
.L7：
.L6：
mov rdi，rax
。 LEHB3：
调用_Unwind_Resume
.LEHE3：
.L9：
添加rsp，552
pop rbx
pop rbp
.cfi_def_cfa 7， 8
ret
.cfi_endproc
.LFE1826：
.globl __gxx_personality_v0
.section .gcc_except_table，a，@ progbits
.LLSDA1826：
.byte 0xff
.byte 0xff
.byte 0x1
.uleb128 .LLSDACSE1826 -.LLSDACSB1826
.LLSDACSB1826：
.uleb128 .LEHB0 -.LFB1826
.uleb128 .LEHE0-.LEHB0
.uleb128 .L7 -.LFB1826
.uleb128 0
.uleb128 .LEHB1-.LFB1826
.uleb128 .LEHE1-.LEHB1
.uleb128 .L8 -.LFB1826
.uleb128 0
.uleb128 .LEHB2-.LFB1826
.uleb128 .LEHE2-.LEHB2
.uleb128 .L7 -.LFB1826
.uleb128 0
.uleb128 .LEHB3 -.LFB1826
.uleb128 .LEHE3-.LEHB3
.uleb128 0
.uleb128 0
.LLSDACSE1826：
.text
.size main，。-main
.identGCC：（GNU）4.8.0 20130502（prerelease）
.section .note.GNU-stack， ，@ progbits
^
和playstate.cpp / p>
.fileplaystate.cpp
.intel_syntax noprefix
.section .text._ZN5StateC2Ev，axG ，@ progbits，_ZN5StateC5Ev，comdat
.align 2
.weak _ZN5StateC2Ev
.type _ZN5StateC2Ev，@function
_ZN5StateC2Ev：
.LFB1：
。 cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6，-16
mov rbp，rsp
.cfi_def_cf a_register 6
mov QWORD PTR [rbp-8]，rdi
mov rax，QWORD PTR [rbp-8]
mov QWORD PTR [rax]，OFFSET FLAT：_ZTV5State + 16
pop rbp
.cfi_def_cfa 7,8
ret
.cfi_endproc
.LFE1：
.size _ZN5StateC2Ev，。-_ ZN5StateC2Ev
.weak _ZN5StateC1Ev
.set _ZN5StateC1Ev，_ZN5StateC2Ev
.section .text._ZN5StateD2Ev，axG，@ progbits，_ZN5StateD5Ev，comdat
.align 2
.weak _ZN5StateD2Ev
.type _ZN5StateD2Ev， @function
_ZN5StateD2Ev：
.LFB4：
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6，-16
mov rbp ，rsp
.cfi_def_cfa_register 6
sub rsp，16
mov QWORD PTR [rbp-8]，rdi
mov rax，QWORD PTR [rbp-8]
mov QWORD PTR [rax]，OFFSET FLAT：_ZTV5State + 16
mov eax，0
test eax，eax
je .L2
mov rax，QWORD PTR [rbp-8]
mov rdi，rax
调用_ZdlPv
.L2：
保留
.cfi_def_cfa 7,8
ret
.cfi_endproc
.LFE4：
.size _ZN5StateD2Ev， _ZN5StateD2Ev
.weak _ZN5StateD1Ev
.set _ZN5StateD1Ev，_ZN5StateD2Ev
.section .text._ZN5StateD0Ev，axG，@ progbits，_ZN5StateD0Ev，comdat
.align 2
。弱_ZN5StateD0Ev
.type _ZN5StateD0Ev，@function
_ZN5StateD0Ev：
.LFB6：
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6，-16
mov rbp，rsp
.cfi_def_cfa_register 6
sub rsp，16
mov QWORD PTR [rbp-8]，rdi
mov rax，QWORD PTR [rbp-8]
mov rdi，rax
call _ZN5StateD1Ev
mov rax，QWORD PTR [rbp-8]
mov rdi，rax
call _ZdlPv
留下
.cfi_def_cfa 7,8
ret
.cfi_endproc
.LFE6：
.size _ZN5StateD0Ev，。-_ ZN5StateD0Ev
.section .rodata
.LC0：
.stringdata / levels /
.text
.align 2
.globl _ZN9PlayStateC2Ev
.type _ZN9PlayStateC2Ev，@function
_ZN9PlayStateC2Ev：
.LFB1043：
.cfi_startproc
.cfi_personality 0x3，__ gxx_personality_v0
.cfi_lsda 0x3，.LLSDA1043
推rbp
.cfi_def_cfa_offset 16
.cfi_offset 6 ，-16
mov rbp，rsp
.cfi_def_cfa_register 6
push rbx
sub rsp，40
.cfi_offset 3，-24
mov QWORD PTR [ rbp-40]，rdi
mov rax，QWORD PTR [rbp-40]
mov rdi，rax
call _ZN5StateC2Ev
mov rax，QWORD PTR [rbp-40]
mov QWORD PTR [rax]，OFFSET FLAT：_ZTV9PlayState + 16
lea rax，[rbp-17]
mov rdi，rax
call _ZNSaIcEC1Ev
mov rax，QWORD PTR [rbp-40]
lea rcx，[rax + 8]
lea rax，[rbp-17]
mov rdx，rax
mov esi，OFFSET FLAT：.LC0
mov rdi，rcx
.LEHB0：
调用_ZNSsC1EPKcRKSaIcE
.LEHE0：
lea rax，[rbp-17]
mov rdi，rax
call _ZNSaIcED1Ev
jmp .L10
.L9：
mov rbx，rax
lea rax，[rbp-17]
mov rdi，rax
call _ZNSaIcED1Ev
mov rax，QWORD PTR [rbp-40]
mov rdi，rax
call _ZN5StateD2Ev
mov rax，rbx
mov rdi，rax
.LEHB1：
call _Unwind_Resume
.LEHE1：
.L10：
添加rsp，40
pop rbx
pop rbp
.cfi_def_cfa 7,8
ret
.cfi_endproc
.LFE1043：
.globl __gxx_personality_v0
.section .gcc_except_table，a，@ progbits
.LLSDA1043：
.byte 0xff
.byte 0xff
.byte 0x1
.uleb128 .LLSDACSE1043 -.LLSDACSB1043
.LLSDACSB1043：
.uleb128 .LEHB0 -.LFB1043
.uleb128 .LEHE0-.LEHB0
.uleb128 .L9-。 LFB1043
.uleb128 0
.uleb128 .LEHB1-.LFB1043
.uleb128 .LEHE1-.LEHB1
.uleb128 0
.uleb128 0
.LLSDACSE1043：
.text
.size _ZN9PlayStateC2Ev，。-_ ZN9PlayStateC2Ev
.globl _ZN9PlayStateC1Ev
.set _ZN9PlayStateC1Ev，_ZN9PlayStateC2Ev
.align 2
.globl _ZN9PlayStateD2Ev
.type _ZN9PlayStateD2Ev，@function
_ZN9PlayStateD2Ev：
.LFB1046：
.cfi_startproc
.cfi_personality 0x3，__ gxx_personality_v0
.cfi_lsda 0x3，.LLSDA1046
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6，-16
mov rbp，rsp
.cfi_def_cfa_register 6
push rbx
sub rsp，24
.cfi_offset 3，-24
mov QWORD PTR [rbp-24]，rdi
mov rax，QWORD PTR [rbp-24]
mov QWORD PTR [rax]，OFFSET FLAT：_ZTV9PlayState + 16
mov rax，QWORD PTR [rbp-24]
add rax，8
mov rdi ，rax
.LEHB2：
调用_ZNSsD1Ev
.LEHE2：
mov rax，QWORD PTR [rbp-24]
mov rdi，rax
调用_ZN5StateD2Ev
mov eax，0
test eax，eax
je .L16
mov rax，QWORD PTR [rbp-24]
mov rdi，rax
调用_ZdlPv
jmp .L16
.L15：
mov rbx，rax
mov rax，QWORD PTR [rbp-24]
mov rdi，rax
调用_ZN5StateD2Ev
mov rax，rbx
mov rdi，rax
.LEHB3：
调用_Unwind_Resume
.LEHE3：
.L16：
添加rsp，24
pop rbx
pop rbp
.cfi_def_cfa 7，8
ret
.cfi_endproc
.LFE1046：
.section。 gcc_except_table
.LLSDA1046：
.byte 0xff
.byte 0xff
.byte 0x1
.uleb128 .LLSDACSE1046 -.LLSDACSB1046
.LLSDACSB1046：
.uleb128 .LEHB2-.LFB1046
.uleb128 .LEHE2-.LEHB2
.uleb128 .L15 -.LFB1046
.uleb128 0
.uleb128 .LEHB3 -.LFB1046
.uleb128 .LEHE3-.LEHB3
.uleb128 0
.uleb128 0
.LLSDACSE1046：
.text
.size _ZN9PlayStateD2Ev，。-_ ZN9PlayStateD2Ev
.globl _ZN9PlayStateD1Ev
.set _ZN9PlayStateD1Ev，_ZN9PlayStateD2Ev
.align 2
.globl _ZN9PlayStateD0Ev
.type _ZN9PlayStateD0Ev ，@function
_ZN9PlayStateD0Ev：
.LFB1048：
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6，-16
mov rbp，rsp
.cfi_def_cfa_register 6
sub rsp，16
mov QWORD PTR [rbp-8]，rdi
mov rax，QWORD PTR [rbp-8]
mov rdi，rax
call _ZN9PlayStateD1Ev
mov rax，QWORD PTR [rbp-8]
mov rdi，rax
call _ZdlPv
leave
.cfi_def_cfa 7 ，8
ret
.cfi_endproc
.LFE1048：
.size _ZN9PlayStateD0Ev，。-_ ZN9PlayStateD0Ev
.align 2
.globl _ZN9PlayState5EnterEv
。键入_ZN9PlayState5EnterEv，@function
_ZN9PlayState5EnterEv：
.LFB1049：
.cfi_startpro c
推rbp
.cfi_def_cfa_offset 16
.cfi_offset 6，-16
mov rbp，rsp
.cfi_def_cfa_register 6
mov QWORD PTR [rbp-8 ]，rdi
pop rbp
.cfi_def_cfa 7,8
ret
.cfi_endproc
.LFE1049：
.size _ZN9PlayState5EnterEv，。-_ ZN9PlayState5EnterEv
.align 2
.globl _ZN9PlayState5LeaveEv
.type _ZN9PlayState5LeaveEv，@function
_ZN9PlayState5LeaveEv：
.LFB1050：
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6，-16
mov rbp，rsp
.cfi_def_cfa_register 6
mov QWORD PTR [rbp-8]，rdi
pop rbp
.cfi_def_cfa 7,8
ret
.cfi_endproc
.LFE1050：
.size _ZN9PlayState5LeaveEv，。-_ ZN9PlayState5LeaveEv
.align 2
.globl _ZN9PlayState6ResumeEv
.type _ZN9PlayState6ResumeEv，@function
_ZN9PlayState6ResumeEv：
.LFB1051：
.c fi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6，-16
mov rbp，rsp
.cfi_def_cfa_register 6
mov QWORD PTR [rbp-8 ]，rdi
pop rbp
.cfi_def_cfa 7，8
ret
.cfi_endproc
.LFE1051：
.size _ZN9PlayState6ResumeEv，。-_ ZN9PlayState6ResumeEv
.align 2
.globl _ZN9PlayState5PauseEv
.type _ZN9PlayState5PauseEv，@function
_ZN9PlayState5PauseEv：
.LFB1052：
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6，-16
mov rbp，rsp
.cfi_def_cfa_register 6
mov QWORD PTR [rbp-8]，rdi
pop rbp
.cfi_def_cfa 7,8
ret
.cfi_endproc
.LFE1052：
.size _ZN9PlayState5PauseEv，。-_ ZN9PlayState5PauseEv
.align 2
.globl _ZN9PlayState12HandleEventsEv
.type _ZN9PlayState12HandleEventsEv，@function
_ZN9PlayState12HandleEv entsEv：
.LFB1053：
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6，-16
mov rbp，rsp
.cfi_def_cfa_register 6
mov QWORD PTR [rbp-8]，rdi
pop rbp
.cfi_def_cfa 7,8
ret
.cfi_endproc
.LFE1053：
.size _ZN9PlayState12HandleEventsEv，。-_ ZN9PlayState12HandleEventsEv
.align 2
.globl _ZN9PlayState6UpdateEv
.type _ZN9PlayState6UpdateEv，@function
_ZN9PlayState6UpdateEv：
.LFB1054：
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6，-16
mov rbp，rsp
.cfi_def_cfa_register 6
mov QWORD PTR [ rbp-8]，rdi
pop rbp
.cfi_def_cfa 7,8
ret
.cfi_endproc
.LFE1054：
.size _ZN9PlayState6UpdateEv，。-_ ZN9PlayState6UpdateEv
.align 2
.globl _ZN9PlayState6RenderEv
.type _ZN9PlayState6RenderEv， @function
_ZN9PlayState6RenderEv：
.LFB1055：
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6，-16
mov rbp ，rsp
.cfi_def_cfa_register 6
mov QWORD PTR [rbp-8]，rdi
pop rbp
.cfi_def_cfa 7,8
ret
.cfi_endproc
.LFE1055：
.size _ZN9PlayState6RenderEv，。-_ ZN9PlayState6RenderEv
.align 2
.globl _ZN9PlayState9LoadLevelESs
.type _ZN9PlayState9LoadLevelESs，@function
_ZN9PlayState9LoadLevelESs：
.LFB1056：
.cfi_startproc
.cfi_personality 0x3，__ gxx_personality_v0
.cfi_lsda 0x3，.LLSDA1056
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6， -16
mov rbp，rsp
.cfi_def_cfa_register 6
push rbx
sub rsp，600
.cfi_offset 3，-24
mov QWORD PTR [rbp -600]，rdi
mov QWORD PTR [rbp-608]，rsi
mov rax，QWORD PTR [rbp -600]
lea rcx，[rax + 8]
lea rax，[rbp-48]
mov rdx，QWORD PTR [rbp-608]
mov rsi，rcx
mov rdi，rax
.LEHB4：
调用_ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_
.LEHE4：
lea rcx，[rbp-48]
lea rax，[rbp-592 ]
mov edx，114
mov rsi，rcx
mov rdi，rax
.LEHB5：
call _ZN11FileManagerC1ERKSsc
.LEHE5：
lea rax，[rbp-32]
lea rcx，[rbp-592]
mov edx，32
mov rsi，rcx
mov rdi，rax
.LEHB6：
call _ZN11FileManager14ReadLineStringEc
lea rax，[rbp-32]
mov rdi，rax
call _ZNSsD1Ev
.LEHE6：
nop
lea rax ，[rbp-592]
mov rdi，rax
.LEHB7：
调用_ZN11FileManagerD1Ev
.LEHE7：
lea rax，[rbp-48]
mov rdi，rax
.LEHB8：
调用_ZNSsD1Ev
.LEHE8：
jmp .L34
.L33：
mov rbx，rax
莱亚，[r bp-592]
mov rdi，rax
调用_ZN11FileManagerD1Ev
jmp .L29
.L32：
mov rbx，rax
.L29：
lea rax，[rbp-48]
mov rdi，rax
call _ZNSsD1Ev
mov rax，rbx
jmp .L30
.L31：
。 L30：
mov rdi，rax
.LEHB9：
调用_Unwind_Resume
.LEHE9：
.L34：
添加rsp，600
pop rbx
pop rbp
.cfi_def_cfa 7,8
ret
.cfi_endproc
.LFE1056：
.section .gcc_except_table
.LLSDA1056：
.byte 0xff
.byte 0xff
.byte 0x1
.uleb128 .LLSDACSE1056 -.LLSDACSB1056
.LLSDACSB1056：
.uleb128 .LEHB4 -.LFB1056
.uleb128 .LEHE4-.LEHB4
.uleb128 .L31 -.LFB1056
.uleb128 0
.uleb128 .LEHB5 -.LFB1056
.uleb128 .LEHE5-.LEHB5
.uleb128 .L32 -.LFB1056
.uleb128 0
.uleb128 .LEHB6-.LFB1056
.uleb128 .LEHE6-.LEHB6
.uleb128。 L33-.LFB1056
.uleb128 0
.uleb128 .LEHB7 -.LFB1056
.uleb128 .LEHE7-.LEHB7
.uleb128 .L32-.LFB1056
.uleb128 0
.uleb128 .LEHB8 -.LFB1056
.uleb128 .LEHE8-.LEHB8
.uleb128 .L31-.LFB1056
.uleb128 0
.uleb128 .LEHB9- .LFB1056
.uleb128 .LEHE9-.LEHB9
.uleb128 0
.uleb128 0
.LLSDACSE1056：
.text
.size _ZN9PlayState9LoadLevelESs， _ZN9PlayState9LoadLevelESs
.section伪.text._ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8 _ AXG，@ PROGBITS，_ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_，COMDAT
.weak伪_ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_
.TYPE _ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_，@function
_ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_：
。 LFB1069：
.cfi_startproc
.cfi_personality 0x3，__ gxx_personality_v0
.cfi_lsda 0x3，.LLSDA1069
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6，-16
mov rbp，rsp
.cfi_def_cfa_register 6
push rbx
sub rsp，40
.cfi_offset 3， -24
mov QWORD PTR [rbp-24]，rdi
mov QWORD PTR [rbp-32]，rsi
mov QWORD PTR [rbp-40]，rdx
mov rdx ，QWORD PTR [rbp-32]
mov rax，QWORD PTR [rbp-24]
mov rsi，rdx
mov rdi，rax
.LEHB10：
call _ZNSsC1ERKSs
.LEHE10：
mov rdx，QWORD PTR [rbp-40]
mov rax，QWORD PTR [rbp-24]
mov rsi，rdx
mov rdi ，rax
.LEHB11：
调用_ZNSs6appendERKSs
.LEHE11：
jmp .L39
.L38：
mov rbx，rax
mov rax ，QWORD PTR [rbp-24]
mov rdi，rax
call _ZNSsD1Ev
mov rax，rbx
mov rdi，rax
.LEHB12：
call _Unwind_Resume
.LEHE12：
.L39：
mov rax，QWORD PTR [rbp-24]
添加rsp，40
pop rbx
pop rbp
.cfi_def_cfa 7,8
ret
.cfi_endproc
.LFE1069：
.section .gcc_except_table
.LLSDA1069：
.byte 0xff
。字节0xff
.byte 0x1
.uleb128 .LLSDACSE1069 -.LLSDACSB1069
.LLSDACSB1069：
.uleb128 .LEHB10 -.LFB1069
.uleb128 .LEHE10-.LEHB10
.uleb128 0
.uleb128 0
.uleb128 .LEHB11-.LFB1069
.uleb128 .LEHE11-.LEHB11
.uleb128 .L38 -.LFB1069
.uleb128 0
.uleb128 .LEHB12-.LFB1069
.uleb128 .LEHE12-.LEHB12
.uleb128 0
.uleb128 0
.LLSDACSE1069：
.section伪.text._ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8 _ AXG，@ PROGBITS，_ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_，COMDAT
.size _ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_。-_ ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_
.weak伪_ZTV9PlayState
.section伪.rodata._ZTV9PlayState， 银， @ progbits，_ZTV9PlaySta te，comdat
.align 32
.type _ZTV9PlayState，@object
.size _ZTV9PlayState，88
_ZTV9PlayState：
.quad 0
.quad _ZTI9PlayState
.quad _ZN9PlayStateD1Ev
.quad _ZN9PlayStateD0Ev
.quad _ZN9PlayState5EnterEv
.quad _ZN9PlayState5LeaveEv
.quad _ZN9PlayState5PauseEv
.quad _ZN9PlayState6ResumeEv
.quad _ZN9PlayState12HandleEventsEv
.quad _ZN9PlayState6UpdateEv
.quad _ZN9PlayState6RenderEv
.weak _ZTV5State
.section .rodata._ZTV5State，aG，@ progbits，_ZTV5State，comdat
.align 32
.type _ZTV5State，@object
.size _ZTV5State，88
_ZTV5State：
.quad 0
.quad _ZTI5State
.quad _ZN5StateD1Ev
.quad _ZN5StateD0Ev
.quad __cxa_pure_virtual
.quad __cxa_pure_virtual
.quad __cxa_pure_virtual
.quad __cxa_pure_virtual
.quad __cxa_pure_virtual
.quad __cxa_pure_virtual
.quad __cxa_pure_virtual
.weak _ZTI9PlayState
.section .rodata._ZTI9PlayState，aG，@ progbits，_ZTI9PlayState，comdat
。对齐16
.type _ZTI9PlayState，@object
.size _ZTI9PlayState，24
_ZTI9PlayState：
.quad _ZTVN10__cxxabiv120__si_class_type_infoE + 16
.quad _ZTS9PlayState
.quad _ZTI5State
.weak _ZTS9PlayState
.section .rodata._ZTS9PlayState，aG，@ progbits，_ZTS9PlayState，comdat
.type _ZTS9PlayState，@object
.size _ZTS9PlayState，11
_ZTS9PlayState：
.string9PlayState
.weak _ZTS5State
.section .rodata._ZTS5State，aG，@ progbits，_ZTS5State，comdat
.type _ZTS5State，@object
.size _ZTS5State，7
_ZTS5State：
.string5State
.weak _ZTI5State
.section .rodata._ZTI5State，aG，@ progbits，_ZTI5State ，com dat
.align 16
.type _ZTI5State，@object
.size _ZTI5State，16
_ZTI5State：
.quad _ZTVN10__cxxabiv117__class_type_infoE + 16
.quad _ZTS5State
.section .rodata
.align 8
.type _ZZL18__gthread_active_pvE20__gthread_active_ptr，@object
.size _ZZL18__gthread_active_pvE20__gthread_active_ptr，8
_ZZL18__gthread_active_pvE20__gthread_active_ptr：
.quad _ZL28__gthrw___pthread_key_createPjPFvPvE
.weakref _ZL28__gthrw ___ pthread_key_createPjPFvPvE，__ pthread_key_create
.identGCC：（GNU）4.8.0 20130502（prerelease）
.section .note.GNU-stack，，@ progbits
有问题的功能：
void
PlayState :: LoadLevel（const std :: string level_name）
{
std :: string full_path = level_directory + level_name;
FileManager文件（full_path，'r'）;
file.ReadLineString（''）;
return;
}
FileManager的构造函数：
FileManager :: FileManager（const std :: string& path，char access_type）
{
buffer = ;
file.exceptions（std :: fstream :: failbit | std :: fstream :: badbit）;
try
{
switch（access_type）
{
case'r'：
file.open（path，std :: ios_base :: openmode： ：_罪）;
break;
case'w'：
file.open（path，std :: ios_base :: openmode :: _ S_out）;
break;
default：
std :: cout<<<< 访问类型：<< access_type<< 无法识别<< std :: endl;
break;
}
}
catch（std :: fstream :: failure）
{
std :: cout<< FileManager构造函数中的I / O异常。\\\
请检查文件是否存在。\\\
Path：<<路径<< \\\
Access type：<< access_type<< std :: endl;
}
return;
}
FileManager :: ReadLineString：
/ *
读取下一行并将其作为字符串返回
* /
std :: string
FileManager :: ReadLineString（）
{
getline（file，buffer）;
return buffer;
}
/ *
如上所述，但是允许使用分隔符。
* /
std :: string
FileManager :: ReadLineString（char delimiter）
{
getline（file，buffer，delimiter）;
return buffer;
}
解决方案
我会采取任何这样的行为通过一个带有一粒盐的调试器。尝试在构造函数中添加一个print语句。最有可能的是，你会发现，根据不调用两次。调试器很容易对于他们的源代码行感到困惑。
如果有疑问，请使用程序集级别调试器（即 si / ni gdb中的）。这将免除任何真正执行的任何疑问。
I am writing a game program in C++ and have encountered an odd problem that seems to be unique to this function.
When this function is called, it executes just as expected all the way through to the return statement. However, upon executing the return statement, the code 'jumps' up two lines to the constructor and executes the code between the constructor and the return statement again. What's more, when I check the value passed to the FileManager constructor on the second iteration, it has the value of 'level_directory' prepended to it (but only inside the constructor, when I check the function call everything is fine).
Relevant info:
Debugger: GDB 7.6-1
OS: Arch Linux x86_64
IDE: Code::Blocks 12.11
g++ -S -masm=intel main.cpp;cat main.s | c++filt > disasm.s
In file included from game.h:9:0,
from main.cpp:4:
playstate.h:32:45: warning: non-static data member initializers only available with -std=c++11 or -std=gnu++11 [enabled by default]
const std::string level_directory = "data/levels/";
.file "main.cpp"
.intel_syntax noprefix
.text
.globl main
.type main, @function
main:
.LFB1826:
.cfi_startproc
.cfi_personality 0x3,__gxx_personality_v0
.cfi_lsda 0x3,.LLSDA1826
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
push rbx
sub rsp, 552
.cfi_offset 3, -24
lea rax, [rbp-560]
mov rdi, rax
.LEHB0:
call _ZN4GameC1Ev
.LEHE0:
jmp .L2
.L3:
lea rax, [rbp-560]
mov rdi, rax
.LEHB1:
call _ZN4Game12HandleEventsEv
lea rax, [rbp-560]
mov rdi, rax
call _ZN4Game6UpdateEv
lea rax, [rbp-560]
mov rdi, rax
call _ZN4Game6RenderEv
.L2:
lea rax, [rbp-560]
mov rdi, rax
call _ZN4Game9isRunningEv
.LEHE1:
test al, al
jne .L3
lea rax, [rbp-560]
mov rdi, rax
.LEHB2:
call _ZN4GameD1Ev
.LEHE2:
mov eax, 0
jmp .L9
.L8:
mov rbx, rax
lea rax, [rbp-560]
mov rdi, rax
call _ZN4GameD1Ev
mov rax, rbx
jmp .L6
.L7:
.L6:
mov rdi, rax
.LEHB3:
call _Unwind_Resume
.LEHE3:
.L9:
add rsp, 552
pop rbx
pop rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1826:
.globl __gxx_personality_v0
.section .gcc_except_table,"a",@progbits
.LLSDA1826:
.byte 0xff
.byte 0xff
.byte 0x1
.uleb128 .LLSDACSE1826-.LLSDACSB1826
.LLSDACSB1826:
.uleb128 .LEHB0-.LFB1826
.uleb128 .LEHE0-.LEHB0
.uleb128 .L7-.LFB1826
.uleb128 0
.uleb128 .LEHB1-.LFB1826
.uleb128 .LEHE1-.LEHB1
.uleb128 .L8-.LFB1826
.uleb128 0
.uleb128 .LEHB2-.LFB1826
.uleb128 .LEHE2-.LEHB2
.uleb128 .L7-.LFB1826
.uleb128 0
.uleb128 .LEHB3-.LFB1826
.uleb128 .LEHE3-.LEHB3
.uleb128 0
.uleb128 0
.LLSDACSE1826:
.text
.size main, .-main
.ident "GCC: (GNU) 4.8.0 20130502 (prerelease)"
.section .note.GNU-stack,"",@progbits
^
and for playstate.cpp
.file "playstate.cpp"
.intel_syntax noprefix
.section .text._ZN5StateC2Ev,"axG",@progbits,_ZN5StateC5Ev,comdat
.align 2
.weak _ZN5StateC2Ev
.type _ZN5StateC2Ev, @function
_ZN5StateC2Ev:
.LFB1:
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
mov QWORD PTR [rbp-8], rdi
mov rax, QWORD PTR [rbp-8]
mov QWORD PTR [rax], OFFSET FLAT:_ZTV5State+16
pop rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1:
.size _ZN5StateC2Ev, .-_ZN5StateC2Ev
.weak _ZN5StateC1Ev
.set _ZN5StateC1Ev,_ZN5StateC2Ev
.section .text._ZN5StateD2Ev,"axG",@progbits,_ZN5StateD5Ev,comdat
.align 2
.weak _ZN5StateD2Ev
.type _ZN5StateD2Ev, @function
_ZN5StateD2Ev:
.LFB4:
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
sub rsp, 16
mov QWORD PTR [rbp-8], rdi
mov rax, QWORD PTR [rbp-8]
mov QWORD PTR [rax], OFFSET FLAT:_ZTV5State+16
mov eax, 0
test eax, eax
je .L2
mov rax, QWORD PTR [rbp-8]
mov rdi, rax
call _ZdlPv
.L2:
leave
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE4:
.size _ZN5StateD2Ev, .-_ZN5StateD2Ev
.weak _ZN5StateD1Ev
.set _ZN5StateD1Ev,_ZN5StateD2Ev
.section .text._ZN5StateD0Ev,"axG",@progbits,_ZN5StateD0Ev,comdat
.align 2
.weak _ZN5StateD0Ev
.type _ZN5StateD0Ev, @function
_ZN5StateD0Ev:
.LFB6:
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
sub rsp, 16
mov QWORD PTR [rbp-8], rdi
mov rax, QWORD PTR [rbp-8]
mov rdi, rax
call _ZN5StateD1Ev
mov rax, QWORD PTR [rbp-8]
mov rdi, rax
call _ZdlPv
leave
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE6:
.size _ZN5StateD0Ev, .-_ZN5StateD0Ev
.section .rodata
.LC0:
.string "data/levels/"
.text
.align 2
.globl _ZN9PlayStateC2Ev
.type _ZN9PlayStateC2Ev, @function
_ZN9PlayStateC2Ev:
.LFB1043:
.cfi_startproc
.cfi_personality 0x3,__gxx_personality_v0
.cfi_lsda 0x3,.LLSDA1043
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
push rbx
sub rsp, 40
.cfi_offset 3, -24
mov QWORD PTR [rbp-40], rdi
mov rax, QWORD PTR [rbp-40]
mov rdi, rax
call _ZN5StateC2Ev
mov rax, QWORD PTR [rbp-40]
mov QWORD PTR [rax], OFFSET FLAT:_ZTV9PlayState+16
lea rax, [rbp-17]
mov rdi, rax
call _ZNSaIcEC1Ev
mov rax, QWORD PTR [rbp-40]
lea rcx, [rax+8]
lea rax, [rbp-17]
mov rdx, rax
mov esi, OFFSET FLAT:.LC0
mov rdi, rcx
.LEHB0:
call _ZNSsC1EPKcRKSaIcE
.LEHE0:
lea rax, [rbp-17]
mov rdi, rax
call _ZNSaIcED1Ev
jmp .L10
.L9:
mov rbx, rax
lea rax, [rbp-17]
mov rdi, rax
call _ZNSaIcED1Ev
mov rax, QWORD PTR [rbp-40]
mov rdi, rax
call _ZN5StateD2Ev
mov rax, rbx
mov rdi, rax
.LEHB1:
call _Unwind_Resume
.LEHE1:
.L10:
add rsp, 40
pop rbx
pop rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1043:
.globl __gxx_personality_v0
.section .gcc_except_table,"a",@progbits
.LLSDA1043:
.byte 0xff
.byte 0xff
.byte 0x1
.uleb128 .LLSDACSE1043-.LLSDACSB1043
.LLSDACSB1043:
.uleb128 .LEHB0-.LFB1043
.uleb128 .LEHE0-.LEHB0
.uleb128 .L9-.LFB1043
.uleb128 0
.uleb128 .LEHB1-.LFB1043
.uleb128 .LEHE1-.LEHB1
.uleb128 0
.uleb128 0
.LLSDACSE1043:
.text
.size _ZN9PlayStateC2Ev, .-_ZN9PlayStateC2Ev
.globl _ZN9PlayStateC1Ev
.set _ZN9PlayStateC1Ev,_ZN9PlayStateC2Ev
.align 2
.globl _ZN9PlayStateD2Ev
.type _ZN9PlayStateD2Ev, @function
_ZN9PlayStateD2Ev:
.LFB1046:
.cfi_startproc
.cfi_personality 0x3,__gxx_personality_v0
.cfi_lsda 0x3,.LLSDA1046
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
push rbx
sub rsp, 24
.cfi_offset 3, -24
mov QWORD PTR [rbp-24], rdi
mov rax, QWORD PTR [rbp-24]
mov QWORD PTR [rax], OFFSET FLAT:_ZTV9PlayState+16
mov rax, QWORD PTR [rbp-24]
add rax, 8
mov rdi, rax
.LEHB2:
call _ZNSsD1Ev
.LEHE2:
mov rax, QWORD PTR [rbp-24]
mov rdi, rax
call _ZN5StateD2Ev
mov eax, 0
test eax, eax
je .L16
mov rax, QWORD PTR [rbp-24]
mov rdi, rax
call _ZdlPv
jmp .L16
.L15:
mov rbx, rax
mov rax, QWORD PTR [rbp-24]
mov rdi, rax
call _ZN5StateD2Ev
mov rax, rbx
mov rdi, rax
.LEHB3:
call _Unwind_Resume
.LEHE3:
.L16:
add rsp, 24
pop rbx
pop rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1046:
.section .gcc_except_table
.LLSDA1046:
.byte 0xff
.byte 0xff
.byte 0x1
.uleb128 .LLSDACSE1046-.LLSDACSB1046
.LLSDACSB1046:
.uleb128 .LEHB2-.LFB1046
.uleb128 .LEHE2-.LEHB2
.uleb128 .L15-.LFB1046
.uleb128 0
.uleb128 .LEHB3-.LFB1046
.uleb128 .LEHE3-.LEHB3
.uleb128 0
.uleb128 0
.LLSDACSE1046:
.text
.size _ZN9PlayStateD2Ev, .-_ZN9PlayStateD2Ev
.globl _ZN9PlayStateD1Ev
.set _ZN9PlayStateD1Ev,_ZN9PlayStateD2Ev
.align 2
.globl _ZN9PlayStateD0Ev
.type _ZN9PlayStateD0Ev, @function
_ZN9PlayStateD0Ev:
.LFB1048:
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
sub rsp, 16
mov QWORD PTR [rbp-8], rdi
mov rax, QWORD PTR [rbp-8]
mov rdi, rax
call _ZN9PlayStateD1Ev
mov rax, QWORD PTR [rbp-8]
mov rdi, rax
call _ZdlPv
leave
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1048:
.size _ZN9PlayStateD0Ev, .-_ZN9PlayStateD0Ev
.align 2
.globl _ZN9PlayState5EnterEv
.type _ZN9PlayState5EnterEv, @function
_ZN9PlayState5EnterEv:
.LFB1049:
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
mov QWORD PTR [rbp-8], rdi
pop rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1049:
.size _ZN9PlayState5EnterEv, .-_ZN9PlayState5EnterEv
.align 2
.globl _ZN9PlayState5LeaveEv
.type _ZN9PlayState5LeaveEv, @function
_ZN9PlayState5LeaveEv:
.LFB1050:
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
mov QWORD PTR [rbp-8], rdi
pop rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1050:
.size _ZN9PlayState5LeaveEv, .-_ZN9PlayState5LeaveEv
.align 2
.globl _ZN9PlayState6ResumeEv
.type _ZN9PlayState6ResumeEv, @function
_ZN9PlayState6ResumeEv:
.LFB1051:
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
mov QWORD PTR [rbp-8], rdi
pop rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1051:
.size _ZN9PlayState6ResumeEv, .-_ZN9PlayState6ResumeEv
.align 2
.globl _ZN9PlayState5PauseEv
.type _ZN9PlayState5PauseEv, @function
_ZN9PlayState5PauseEv:
.LFB1052:
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
mov QWORD PTR [rbp-8], rdi
pop rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1052:
.size _ZN9PlayState5PauseEv, .-_ZN9PlayState5PauseEv
.align 2
.globl _ZN9PlayState12HandleEventsEv
.type _ZN9PlayState12HandleEventsEv, @function
_ZN9PlayState12HandleEventsEv:
.LFB1053:
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
mov QWORD PTR [rbp-8], rdi
pop rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1053:
.size _ZN9PlayState12HandleEventsEv, .-_ZN9PlayState12HandleEventsEv
.align 2
.globl _ZN9PlayState6UpdateEv
.type _ZN9PlayState6UpdateEv, @function
_ZN9PlayState6UpdateEv:
.LFB1054:
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
mov QWORD PTR [rbp-8], rdi
pop rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1054:
.size _ZN9PlayState6UpdateEv, .-_ZN9PlayState6UpdateEv
.align 2
.globl _ZN9PlayState6RenderEv
.type _ZN9PlayState6RenderEv, @function
_ZN9PlayState6RenderEv:
.LFB1055:
.cfi_startproc
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
mov QWORD PTR [rbp-8], rdi
pop rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1055:
.size _ZN9PlayState6RenderEv, .-_ZN9PlayState6RenderEv
.align 2
.globl _ZN9PlayState9LoadLevelESs
.type _ZN9PlayState9LoadLevelESs, @function
_ZN9PlayState9LoadLevelESs:
.LFB1056:
.cfi_startproc
.cfi_personality 0x3,__gxx_personality_v0
.cfi_lsda 0x3,.LLSDA1056
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
push rbx
sub rsp, 600
.cfi_offset 3, -24
mov QWORD PTR [rbp-600], rdi
mov QWORD PTR [rbp-608], rsi
mov rax, QWORD PTR [rbp-600]
lea rcx, [rax+8]
lea rax, [rbp-48]
mov rdx, QWORD PTR [rbp-608]
mov rsi, rcx
mov rdi, rax
.LEHB4:
call _ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_
.LEHE4:
lea rcx, [rbp-48]
lea rax, [rbp-592]
mov edx, 114
mov rsi, rcx
mov rdi, rax
.LEHB5:
call _ZN11FileManagerC1ERKSsc
.LEHE5:
lea rax, [rbp-32]
lea rcx, [rbp-592]
mov edx, 32
mov rsi, rcx
mov rdi, rax
.LEHB6:
call _ZN11FileManager14ReadLineStringEc
lea rax, [rbp-32]
mov rdi, rax
call _ZNSsD1Ev
.LEHE6:
nop
lea rax, [rbp-592]
mov rdi, rax
.LEHB7:
call _ZN11FileManagerD1Ev
.LEHE7:
lea rax, [rbp-48]
mov rdi, rax
.LEHB8:
call _ZNSsD1Ev
.LEHE8:
jmp .L34
.L33:
mov rbx, rax
lea rax, [rbp-592]
mov rdi, rax
call _ZN11FileManagerD1Ev
jmp .L29
.L32:
mov rbx, rax
.L29:
lea rax, [rbp-48]
mov rdi, rax
call _ZNSsD1Ev
mov rax, rbx
jmp .L30
.L31:
.L30:
mov rdi, rax
.LEHB9:
call _Unwind_Resume
.LEHE9:
.L34:
add rsp, 600
pop rbx
pop rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1056:
.section .gcc_except_table
.LLSDA1056:
.byte 0xff
.byte 0xff
.byte 0x1
.uleb128 .LLSDACSE1056-.LLSDACSB1056
.LLSDACSB1056:
.uleb128 .LEHB4-.LFB1056
.uleb128 .LEHE4-.LEHB4
.uleb128 .L31-.LFB1056
.uleb128 0
.uleb128 .LEHB5-.LFB1056
.uleb128 .LEHE5-.LEHB5
.uleb128 .L32-.LFB1056
.uleb128 0
.uleb128 .LEHB6-.LFB1056
.uleb128 .LEHE6-.LEHB6
.uleb128 .L33-.LFB1056
.uleb128 0
.uleb128 .LEHB7-.LFB1056
.uleb128 .LEHE7-.LEHB7
.uleb128 .L32-.LFB1056
.uleb128 0
.uleb128 .LEHB8-.LFB1056
.uleb128 .LEHE8-.LEHB8
.uleb128 .L31-.LFB1056
.uleb128 0
.uleb128 .LEHB9-.LFB1056
.uleb128 .LEHE9-.LEHB9
.uleb128 0
.uleb128 0
.LLSDACSE1056:
.text
.size _ZN9PlayState9LoadLevelESs, .-_ZN9PlayState9LoadLevelESs
.section .text._ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_,"axG",@progbits,_ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_,comdat
.weak _ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_
.type _ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_, @function
_ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_:
.LFB1069:
.cfi_startproc
.cfi_personality 0x3,__gxx_personality_v0
.cfi_lsda 0x3,.LLSDA1069
push rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
mov rbp, rsp
.cfi_def_cfa_register 6
push rbx
sub rsp, 40
.cfi_offset 3, -24
mov QWORD PTR [rbp-24], rdi
mov QWORD PTR [rbp-32], rsi
mov QWORD PTR [rbp-40], rdx
mov rdx, QWORD PTR [rbp-32]
mov rax, QWORD PTR [rbp-24]
mov rsi, rdx
mov rdi, rax
.LEHB10:
call _ZNSsC1ERKSs
.LEHE10:
mov rdx, QWORD PTR [rbp-40]
mov rax, QWORD PTR [rbp-24]
mov rsi, rdx
mov rdi, rax
.LEHB11:
call _ZNSs6appendERKSs
.LEHE11:
jmp .L39
.L38:
mov rbx, rax
mov rax, QWORD PTR [rbp-24]
mov rdi, rax
call _ZNSsD1Ev
mov rax, rbx
mov rdi, rax
.LEHB12:
call _Unwind_Resume
.LEHE12:
.L39:
mov rax, QWORD PTR [rbp-24]
add rsp, 40
pop rbx
pop rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1069:
.section .gcc_except_table
.LLSDA1069:
.byte 0xff
.byte 0xff
.byte 0x1
.uleb128 .LLSDACSE1069-.LLSDACSB1069
.LLSDACSB1069:
.uleb128 .LEHB10-.LFB1069
.uleb128 .LEHE10-.LEHB10
.uleb128 0
.uleb128 0
.uleb128 .LEHB11-.LFB1069
.uleb128 .LEHE11-.LEHB11
.uleb128 .L38-.LFB1069
.uleb128 0
.uleb128 .LEHB12-.LFB1069
.uleb128 .LEHE12-.LEHB12
.uleb128 0
.uleb128 0
.LLSDACSE1069:
.section .text._ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_,"axG",@progbits,_ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_,comdat
.size _ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_, .-_ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_
.weak _ZTV9PlayState
.section .rodata._ZTV9PlayState,"aG",@progbits,_ZTV9PlayState,comdat
.align 32
.type _ZTV9PlayState, @object
.size _ZTV9PlayState, 88
_ZTV9PlayState:
.quad 0
.quad _ZTI9PlayState
.quad _ZN9PlayStateD1Ev
.quad _ZN9PlayStateD0Ev
.quad _ZN9PlayState5EnterEv
.quad _ZN9PlayState5LeaveEv
.quad _ZN9PlayState5PauseEv
.quad _ZN9PlayState6ResumeEv
.quad _ZN9PlayState12HandleEventsEv
.quad _ZN9PlayState6UpdateEv
.quad _ZN9PlayState6RenderEv
.weak _ZTV5State
.section .rodata._ZTV5State,"aG",@progbits,_ZTV5State,comdat
.align 32
.type _ZTV5State, @object
.size _ZTV5State, 88
_ZTV5State:
.quad 0
.quad _ZTI5State
.quad _ZN5StateD1Ev
.quad _ZN5StateD0Ev
.quad __cxa_pure_virtual
.quad __cxa_pure_virtual
.quad __cxa_pure_virtual
.quad __cxa_pure_virtual
.quad __cxa_pure_virtual
.quad __cxa_pure_virtual
.quad __cxa_pure_virtual
.weak _ZTI9PlayState
.section .rodata._ZTI9PlayState,"aG",@progbits,_ZTI9PlayState,comdat
.align 16
.type _ZTI9PlayState, @object
.size _ZTI9PlayState, 24
_ZTI9PlayState:
.quad _ZTVN10__cxxabiv120__si_class_type_infoE+16
.quad _ZTS9PlayState
.quad _ZTI5State
.weak _ZTS9PlayState
.section .rodata._ZTS9PlayState,"aG",@progbits,_ZTS9PlayState,comdat
.type _ZTS9PlayState, @object
.size _ZTS9PlayState, 11
_ZTS9PlayState:
.string "9PlayState"
.weak _ZTS5State
.section .rodata._ZTS5State,"aG",@progbits,_ZTS5State,comdat
.type _ZTS5State, @object
.size _ZTS5State, 7
_ZTS5State:
.string "5State"
.weak _ZTI5State
.section .rodata._ZTI5State,"aG",@progbits,_ZTI5State,comdat
.align 16
.type _ZTI5State, @object
.size _ZTI5State, 16
_ZTI5State:
.quad _ZTVN10__cxxabiv117__class_type_infoE+16
.quad _ZTS5State
.section .rodata
.align 8
.type _ZZL18__gthread_active_pvE20__gthread_active_ptr, @object
.size _ZZL18__gthread_active_pvE20__gthread_active_ptr, 8
_ZZL18__gthread_active_pvE20__gthread_active_ptr:
.quad _ZL28__gthrw___pthread_key_createPjPFvPvE
.weakref _ZL28__gthrw___pthread_key_createPjPFvPvE,__pthread_key_create
.ident "GCC: (GNU) 4.8.0 20130502 (prerelease)"
.section .note.GNU-stack,"",@progbits
The function in question:
void
PlayState::LoadLevel(const std::string level_name)
{
std::string full_path = level_directory + level_name;
FileManager file(full_path, 'r');
file.ReadLineString(' ');
return;
}
The constructor for FileManager:
FileManager::FileManager(const std::string &path, char access_type)
{
buffer = "";
file.exceptions(std::fstream::failbit | std::fstream::badbit);
try
{
switch (access_type)
{
case 'r':
file.open(path, std::ios_base::openmode::_S_in);
break;
case 'w':
file.open(path, std::ios_base::openmode::_S_out);
break;
default:
std::cout << "Access type: " << access_type << " not recognised" << std::endl;
break;
}
}
catch(std::fstream::failure)
{
std::cout << "I/O exception in FileManager constructor.\nPlease check that the file exists.\nPath: " << path << "\nAccess type: " << access_type << std::endl;
}
return;
}
FileManager::ReadLineString:
/*
Reads the next line and returns it as a string
*/
std::string
FileManager::ReadLineString()
{
getline(file, buffer);
return buffer;
}
/*
As above, but allows to use of a delimiter.
*/
std::string
FileManager::ReadLineString(char delimiter)
{
getline(file, buffer, delimiter);
return buffer;
}
解决方案
I would take any such behavior by a debugger with a grain of salt. Try adding a print statement inside the constructor. Most likely, you’ll find that it’s not getting called twice at all. Debuggers easily get confused about what source line they’re on.
When in doubt, use assembly level stepping in the debugger (i.e. si / ni in gdb). That will remove any doubt what is truly executed.
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