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Add support for naked functions

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76198 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2009-07-17 18:07:26 +00:00
parent a9af7e626c
commit c5ec8a78ea
8 changed files with 18 additions and 5 deletions
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7
lib/CodeGen/PrologEpilogInserter.cpp
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@@ -51,6 +51,7 @@ FunctionPass *llvm::createPrologEpilogCodeInserter() { return new PEI(); }
/// frame indexes with appropriate references.
///
bool PEI::runOnMachineFunction(MachineFunction &Fn) {
const Function* F = Fn.getFunction();
const TargetRegisterInfo *TRI = Fn.getTarget().getRegisterInfo();
RS = TRI->requiresRegisterScavenging(Fn) ? new RegScavenger() : NULL;
@@ -80,7 +81,8 @@ bool PEI::runOnMachineFunction(MachineFunction &Fn) {
placeCSRSpillsAndRestores(Fn);
// Add the code to save and restore the callee saved registers
insertCSRSpillsAndRestores(Fn);
if (!F->hasFnAttr(Attribute::Naked))
insertCSRSpillsAndRestores(Fn);
// Allow the target machine to make final modifications to the function
// before the frame layout is finalized.
@@ -94,7 +96,8 @@ bool PEI::runOnMachineFunction(MachineFunction &Fn) {
// called functions. Because of this, calculateCalleeSavedRegisters
// must be called before this function in order to set the HasCalls
// and MaxCallFrameSize variables.
insertPrologEpilogCode(Fn);
if (!F->hasFnAttr(Attribute::Naked))
insertPrologEpilogCode(Fn);
// Replace all MO_FrameIndex operands with physical register references
// and actual offsets.