本文整理汇总了C++中StackMaps::recordPatchPoint方法的典型用法代码示例。如果您正苦于以下问题：C++ StackMaps::recordPatchPoint方法的具体用法？C++ StackMaps::recordPatchPoint怎么用？C++ StackMaps::recordPatchPoint使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类StackMaps的用法示例。
在下文中一共展示了StackMaps::recordPatchPoint方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: LowerPATCHPOINT
// Lower a patchpoint of the form:
// [<def>], <id>, <numBytes>, <target>, <numArgs>, <cc>, ...
static void LowerPATCHPOINT(MCStreamer &OS, StackMaps &SM,
const MachineInstr &MI, bool Is64Bit, const MCSubtargetInfo& STI) {
assert(Is64Bit && "Patchpoint currently only supports X86-64");
SM.recordPatchPoint(MI);
PatchPointOpers opers(&MI);
unsigned ScratchIdx = opers.getNextScratchIdx();
unsigned EncodedBytes = 0;
int64_t CallTarget = opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
if (CallTarget) {
// Emit MOV to materialize the target address and the CALL to target.
// This is encoded with 12-13 bytes, depending on which register is used.
unsigned ScratchReg = MI.getOperand(ScratchIdx).getReg();
if (X86II::isX86_64ExtendedReg(ScratchReg))
EncodedBytes = 13;
else
EncodedBytes = 12;
OS.EmitInstruction(MCInstBuilder(X86::MOV64ri).addReg(ScratchReg)
.addImm(CallTarget), STI);
OS.EmitInstruction(MCInstBuilder(X86::CALL64r).addReg(ScratchReg), STI);
}
// Emit padding.
unsigned NumBytes = opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
assert(NumBytes >= EncodedBytes &&
"Patchpoint can't request size less than the length of a call.");
EmitNops(OS, NumBytes - EncodedBytes, Is64Bit, STI);
}