我有以下函数需要3个双重参数。在我的调试器中,当达到此功能的中断时。检查函数的参数我没有看到3个双重论点。在x86上如何将双精度函数传递给函数
在x86平台上的双参数保存在栈上的功能?
下面是在WinDbg中的功能和拆卸。为什么我看不到在windbg中传递给函数的值为Args to Child?
vector<double> calculate_quadratic(double a, double b, double c)
{
double discriminant = (b * b) - 4 * a * c;
vector<double>result;
try
{
if (discriminant < 0)
throw Bad_Value{};
else
{
double d = sqrt(discriminant);
double px = (-b + d)/(2 * a);
double nx = (-b - d)/(2 * a);
result.push_back(px);
result.push_back(nx);
}
}
catch (Bad_Value)
{
cerr << "invalid value" << endl;
}
return result;
}
0:000> kb
# ChildEBP RetAddr Args to Child
00 003dfd2c 0126ad86 003dfe30 00000000 3ff00000 quadratic!calculate_quadratic
01 003dfe84 0126ba6e 00000001 0043d080 0043dd18 quadratic!main+0xc6
02 003dfe98 0126b8d0 ac1dec02 00000000 00000000 quadratic!invoke_main+0x1e
03 003dfef0 0126b76d 003dff00 0126ba88 003dff0c quadratic!__scrt_common_main_seh+0x150
04 003dfef8 0126ba88 003dff0c 772c336a 7efde000 quadratic!__scrt_common_main+0xd
05 003dff00 772c336a 7efde000 003dff4c 777f9f72 quadratic!mainCRTStartup+0x8
06 003dff0c 777f9f72 7efde000 77465726 00000000 kernel32!BaseThreadInitThunk+0xe
07 003dff4c 777f9f45 01261127 7efde000 00000000 ntdll!__RtlUserThreadStart+0x70
08 003dff64 00000000 01261127 7efde000 00000000 ntdll!_RtlUserThreadStart+0x1b
0:000> r
eax=003dfe30 ebx=003dfd48 ecx=acd07c23 edx=582e27d8 esi=003dfd50 edi=003dfd4c
eip=01268f70 esp=003dfd30 ebp=003dfe84 iopl=0 nv up ei pl nz ac po nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000212
quadratic!calculate_quadratic:
01268f70 push ebp
0:000> dv /t /v
003dfd38 double a = 1
003dfd40 double b = -3
003dfd48 double c = 2
003dfd0c double discriminant = 1.7499487580265442e+127
003dfcf4 struct Vector<double> result = struct Vector<double>
倾倒顶框的ChildEBP我现在可以看到以相反的顺序在堆栈上的参数 - 在这种情况下,我用10个三次,其被表示为40240000亿
0:000> kb
# ChildEBP RetAddr Args to Child
00 004cfac4 0017ad86 004cfbc8 00000000 40240000 quadratic!calculate_quadratic
0:000> dd 004cfac4
004cfac4 5a23da80 0017ad86 004cfbc8 00000000
004cfad4 40240000 00000000 40240000 00000000
004cfae4 40240000 ed0a64cf 00000000 00000000
0:000> .formats 4024000000000000
Evaluate expression:
Hex: 40240000`00000000
Decimal: 4621819117588971520
Octal: 0400440000000000000000
Binary: 01000000 00100100 00000000 00000000 00000000 00000000 00000000 00000000
Chars: @$......
Time: Fri Dec 18 11:22:38.897 16246 (UTC - 5:00)
Float: low 0 high 2.5625
Double: 10
我不知道有关Windows,但在Linux上,有适用于System V应用程序二进制接口,其中寄存器XMM0到XMM7用于传递浮点参数。你也应该转储这些寄存器。 – overseas
我期待在堆栈的顶部框架:00 003dfd2c 0126ad86 003dfe30 00000000 3ff00000二次calculate_quadratic ----我会尝试你的建议.... – dcrearer
@overseas你确定这是一个x86版本真(32位)? –