函数体调用C ++末尾的奇怪循环
Posted
技术标签:
【中文标题】函数体调用C ++末尾的奇怪循环【英文标题】：Strange looping at end of function body call C++ 【发布时间】：2013-05-07 19:56:34 【问题描述】：我正在用 C++ 编写一个游戏程序，遇到了一个奇怪的问题，似乎是这个函数独有的。
当这个函数被调用时，它会按照预期一直执行到 return 语句。但是，在执行 return 语句时，代码“跳转”到构造函数的两行，并再次执行构造函数和 return 语句之间的代码。更重要的是，当我在第二次迭代中检查传递给 FileManager 构造函数的值时，它前面附加了 'level_directory' 的值（但只有 inside 构造函数，当我检查函数调用所有内容时没问题）。
相关信息：
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
^
对于 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
有问题的函数：
void
PlayState::LoadLevel(const std::string level_name)
std::string full_path = level_directory + level_name;
FileManager file(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::_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;
【问题讨论】：
您使用的是哪个调试器？ 添加到问题中； GDB :) 这可能只是优化器对代码的重新排序。在禁用优化的情况下重新编译，然后重试。 使用参考会导致问题与副本相比？这是一个死的赠品，你在某处发生了内存损坏。 嗯，没有人会涉足所有未注释的程序集。至少去掉不相关的部分。否则，这不太可能对网站的任何未来访问者有所帮助（他们可能会在文章中看到点击量，但由于篇幅过长而进行了 TL；DR）。 【参考方案1】：我会通过调试器对任何此类行为持保留态度。尝试在构造函数中添加打印语句。最有可能的是，您会发现它没有被调用两次。调试器很容易对它们所在的源代码行感到困惑。
如有疑问，请在调试器中使用 程序集 级步进（即 gdb 中的 si / ni）。这将消除真正执行的任何疑问。
【讨论】：
你是对的！构造函数只执行一次，尽管指示的代码是单步执行的。以上是关于函数体调用C ++末尾的奇怪循环的主要内容，如果未能解决你的问题，请参考以下文章
list列表和tuple条件判断循环dict和set调用函数定义函数
C程序：一维数组x中的若干个数已按从小到大的顺序有序；在主函数中输入一个数，调用一个insert函数将其插