两种语法相同
-(void)aFunc
{
int i=0;
for(;i<5;)
@autoreleasepool {
++i;
}
}
-(void)bFunc
{
int i=0;
for(;i<5;)
{
@autoreleasepool {
++i;
}
}
}
汇编代码
"-[AppDelegate aFunc]": ## @"\01-[AppDelegate aFunc]"
.cfi_startproc
Lfunc_begin0:
.loc 1 12 0 ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:12:0
## BB#0:
pushq %rbp
Ltmp2:
.cfi_def_cfa_offset 16
Ltmp3:
.cfi_offset %rbp, -16
movq %rsp, %rbp
Ltmp4:
.cfi_def_cfa_register %rbp
subq $32, %rsp
movq %rdi, -8(%rbp)
movq %rsi, -16(%rbp)
.loc 1 14 12 prologue_end ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:14:12
Ltmp5:
movl $0, -20(%rbp)
LBB0_1: ## =>This Inner Loop Header: Depth=1
.loc 1 15 5 ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:15:5
Ltmp6:
cmpl $5, -20(%rbp)
jge LBB0_3
## BB#2: ## in Loop: Header=BB0_1 Depth=1
.loc 1 16 26 ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:16:26
Ltmp7:
callq _objc_autoreleasePoolPush
.loc 1 17 13 ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:17:13
movl -20(%rbp), %ecx
addl $1, %ecx
movl %ecx, -20(%rbp)
.loc 1 18 9 ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:18:9
movq %rax, %rdi
callq _objc_autoreleasePoolPop
jmp LBB0_1
Ltmp8:
LBB0_3:
.loc 1 19 1 ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:19:1
addq $32, %rsp
popq %rbp
ret
Ltmp9:
Lfunc_end0:
.file 2 "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h"
.file 3 "/Users/Parag/Desktop/Test/Test/AppDelegate.h"
.cfi_endproc
.align 4, 0x90
"-[AppDelegate bFunc]": ## @"\01-[AppDelegate bFunc]"
.cfi_startproc
Lfunc_begin1:
.loc 1 20 0 ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:20:0
## BB#0:
pushq %rbp
Ltmp12:
.cfi_def_cfa_offset 16
Ltmp13:
.cfi_offset %rbp, -16
movq %rsp, %rbp
Ltmp14:
.cfi_def_cfa_register %rbp
subq $32, %rsp
movq %rdi, -8(%rbp)
movq %rsi, -16(%rbp)
.loc 1 22 12 prologue_end ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:22:12
Ltmp15:
movl $0, -20(%rbp)
LBB1_1: ## =>This Inner Loop Header: Depth=1
.loc 1 23 5 ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:23:5
Ltmp16:
cmpl $5, -20(%rbp)
jge LBB1_3
## BB#2: ## in Loop: Header=BB1_1 Depth=1
.loc 1 25 26 ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:25:26
Ltmp17:
callq _objc_autoreleasePoolPush
.loc 1 26 14 ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:26:14
movl -20(%rbp), %ecx
addl $1, %ecx
movl %ecx, -20(%rbp)
.loc 1 27 9 ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:27:9
movq %rax, %rdi
callq _objc_autoreleasePoolPop
Ltmp18:
.loc 1 28 5 ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:28:5
jmp LBB1_1
Ltmp19:
LBB1_3:
.loc 1 29 1 ## /Users/Parag/Desktop/Test/Test/AppDelegate.m:29:1
addq $32, %rsp
popq %rbp
ret
Ltmp20:
Lfunc_end1: