函数主体调用C ++末尾的奇怪循环
[英]Strange looping at end of function body call C++
问题描述
I am writing a game program in C++ and have encountered an odd problem that seems to be unique to this function. 
我正在用C ++写一个游戏程序，遇到了一个奇怪的问题，该问题似乎是该函数所独有的。
When this function is called, it executes just as expected all the way through to the return statement. 调用此函数时，它将一直按预期执行，直到返回语句为止。 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. 但是，在执行return语句时，代码将跳转两行到构造函数，并再次执行构造函数和return语句之间的代码。 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). 更重要的是，当我检查第二次迭代传递给FileManager构造函数的值时，它的值前面是'level_directory'的值（但仅在构造函数内部 ，当我检查函数调用时，一切都很好）。
Relevant info: 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 | g ++ -S -masm = intel main.cpp; cat main.s | c++filt > disasm.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 和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: 有问题的功能：
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: 文件管理器:: 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;
}
1 个解决方案
解决方案1
1 已采纳 2013-05-07 21:16:33
I would take any such behavior by a debugger with a grain of salt. 我会采取任何带有调试器的行为。 Try adding a print statement inside the constructor. 尝试在构造函数中添加打印语句。 Most likely, you'll find that it's not getting called twice at all. 您很可能会发现它根本没有被调用过两次。 Debuggers easily get confused about what source line they're on. 调试器很容易对它们所在的源代码行感到困惑。
When in doubt, use assembly level stepping in the debugger (ie si / ni in gdb). 如有疑问，请在调试器中使用程序集级步进（即gdb中的si / ni ）。 That will remove any doubt what is truly executed. 这将消除任何疑问，真正执行什么。
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