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Fix comment in ABIMacOSX_i386::RegisterIsCalleeSaved to say that 

these are the *non-volatile* registers on Darwin/i386, not the
volatile registers.
Recognize the sp, pc, fp generic reg names as well.

llvm-svn: 169316
This commit is contained in:
Jason Molenda 2012-12-04 22:08:50 +00:00
parent 67cb31ebdd
commit 011aea45a9
1 changed files with 10 additions and 2 deletions
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12
lldb/source/Plugins/ABI/MacOSX-i386/ABIMacOSX_i386.cpp
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@ -931,19 +931,21 @@ ABIMacOSX_i386::RegisterIsVolatile (const RegisterInfo *reg_info)
return RegisterIsCalleeSaved (reg_info);
}
// v. http://developer.apple.com/library/mac/#documentation/developertools/Conceptual/LowLevelABI/130-IA-32_Function_Calling_Conventions/IA32.html#//apple_ref/doc/uid/TP40002492-SW4
bool
ABIMacOSX_i386::RegisterIsCalleeSaved (const RegisterInfo *reg_info)
{
if (reg_info)
{
// Volatile registers include: ebx, ebp, esi, edi, esp, eip
// Saved registers are ebx, ebp, esi, edi, esp, eip
const char *name = reg_info->name;
if (name[0] == 'e')
{
switch (name[1])
{
case 'b':
if (name[2] == 'x') // ebp is volatile in the ABI, but the unwinders can find it
if (name[2] == 'x' || name[2] == 'p')
return name[3] == '\0';
break;
case 'd':
@ -960,6 +962,12 @@ ABIMacOSX_i386::RegisterIsCalleeSaved (const RegisterInfo *reg_info)
break;
}
}
if (name[0] == 's' && name[1] == 'p' && name[2] == '\0') // sp
return true;
if (name[0] == 'f' && name[1] == 'p' && name[2] == '\0') // fp
return true;
if (name[0] == 'p' && name[1] == 'c' && name[2] == '\0') // pc
return true;
}
return false;
}