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Update comments around ABISysV_x86_64::RegisterIsCalleeSaved to 

make it clear that this is the list of callee-saved registers,
add reference to the ABI doc that this comes from.

llvm-svn: 169807
This commit is contained in:
Jason Molenda 2012-12-11 01:20:57 +00:00
parent 6740853784
commit 21d1e9e53d
1 changed files with 17 additions and 2 deletions
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19
lldb/source/Plugins/ABI/SysV-x86_64/ABISysV_x86_64.cpp
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@ -1153,14 +1153,23 @@ ABISysV_x86_64::RegisterIsVolatile (const RegisterInfo *reg_info)
// See "Register Usage" in the
// "System V Application Binary Interface"
// "AMD64 Architecture Processor Supplement"
// (or "x86-64(tm) Architecture Processor Supplement" in earlier revisions)
// Edited by Michael Matz, Jan Hubicka, Andreas Jaeger, and Mark Mitchell
// current version is 0.99.6 released 2012-05-15 at http://x86-64.org/documentation/abi.pdf
bool
ABISysV_x86_64::RegisterIsCalleeSaved (const RegisterInfo *reg_info)
{
if (reg_info)
{
// Volatile registers include: rbx, rbp, rsp, r12, r13, r14, r15, rip
// Preserved registers are :
// rbx, rsp, rbp, r12, r13, r14, r15
// mxcsr (partially preserved)
// x87 control word
const char *name = reg_info->name;
if (name[0] == 'r')
{
@ -1198,6 +1207,12 @@ ABISysV_x86_64::RegisterIsCalleeSaved (const RegisterInfo *reg_info)
}
}
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;
}