15.1 确认编译结果
cbc --print-asm -fverbose-asm xx.cb可以看到汇编代码。gcc -S -o - xx.c也可以。
root@cf43f429204e:/# cbc --print-asm -fverbose-asm if_test.cb
.file "if_test.cb"
.section .rodata
.LC0:
.string "OK"
.LC1:
.string "NO"
.LC2:
.string "ERR"
.text
.globl main
.type main,@function
main:
# ---- Stack Frame Layout -----------
# (%ebp): return address
# 4(%ebp): saved %ebp
# 8(%ebp): argc
# 12(%ebp): argv
# -----------------------------------
pushl %ebp
movl %esp, %ebp
# line 4: if(1) if (2) { puts("OK"); }
# Int {
movl $1, %eax
# }
testl %eax, %eax
jnz .L0
jmp .L1
.L0:
# line 4: if (2) { puts("OK"); }
# Int {
movl $2, %eax
# }
testl %eax, %eax
jnz .L2
jmp .L3
.L2:
# line 4: puts("OK"); }
# Call {
# Str {
movl $.LC0, %eax
# }
pushl %eax
call puts
addl $4, %esp
# }
jmp .L4
.L3:
# line 5: if(3) {puts("NO");}
# Int {
movl $3, %eax
# }
testl %eax, %eax
jnz .L5
jmp .L6
.L5:
# line 5: puts("NO");}
# Call {
# Str {
movl $.LC1, %eax
# }
pushl %eax
call puts
addl $4, %esp
# }
jmp .L7
.L6:
# line 6: puts("ERR");}
# Call {
# Str {
movl $.LC2, %eax
# }
pushl %eax
call puts
addl $4, %esp
# }
.L7:
.L4:
.L1:
# line 7: return 0;}
# Int {
movl $0, %eax
# }
jmp .L8
.L8:
movl %ebp, %esp
popl %ebp
ret
.size main,.-main