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Handle ARM machine constantpool entry with non-lazy ptr.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58882 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-11-08 01:31:27 +00:00
parent fd827c41ce
commit e96a490d7a
3 changed files with 24 additions and 6 deletions
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9
lib/Target/ARM/ARMCodeEmitter.cpp
View File

@ -336,8 +336,13 @@ void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
GlobalValue *GV = ACPV->getGV();
if (GV) {
assert(!ACPV->isStub() && "Don't know how to deal this yet!");
emitGlobalAddress(GV, ARM::reloc_arm_machine_cp_entry, false,
(intptr_t)ACPV);
if (ACPV->isNonLazyPointer())
MCE.addRelocation(MachineRelocation::getGVNonLazyPtr(
MCE.getCurrentPCOffset(), ARM::reloc_arm_machine_cp_entry, GV,
(intptr_t)ACPV, false));
else
emitGlobalAddress(GV, ARM::reloc_arm_machine_cp_entry,
ACPV->isStub(), (intptr_t)ACPV);
} else {
assert(!ACPV->isNonLazyPointer() && "Don't know how to deal this yet!");
emitExternalSymbolAddress(ACPV->getSymbol(), ARM::reloc_arm_absolute);

15
lib/Target/ARM/ARMJITInfo.cpp
View File

@ -133,14 +133,21 @@ ARMJITInfo::getLazyResolverFunction(JITCompilerFn F) {
return ARMCompilationCallback;
}
void *ARMJITInfo::emitGlobalValueNonLazyPtr(const GlobalValue *GV, void *Ptr,
MachineCodeEmitter &MCE) {
MCE.startFunctionStub(GV, 4, 4); // FIXME: Rename this.
MCE.emitWordLE((intptr_t)Ptr);
return MCE.finishFunctionStub(GV);
}
void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn,
MachineCodeEmitter &MCE) {
unsigned addr = (intptr_t)Fn;
// If this is just a call to an external function, emit a branch instead of a
// call. The code is the same except for one bit of the last instruction.
if (Fn != (void*)(intptr_t)ARMCompilationCallback) {
// branch to the corresponding function addr
// the stub is 8-byte size and 4-aligned
// Branch to the corresponding function addr.
// The stub is 8-byte size and 4-aligned.
MCE.startFunctionStub(F, 8, 4);
MCE.emitWordLE(0xe51ff004); // LDR PC, [PC,#-4]
MCE.emitWordLE(addr); // addr of function
@ -150,8 +157,8 @@ void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn,
// This stub sets the return address to restart the stub, so that
// the new branch will be invoked when we come back.
//
// branch and link to the compilation callback.
// the stub is 16-byte size and 4-byte aligned.
// Branch and link to the compilation callback.
// The stub is 16-byte size and 4-byte aligned.
MCE.startFunctionStub(F, 16, 4);
// Save LR so the callback can determine which stub called it.
// The compilation callback is responsible for popping this prior

6
lib/Target/ARM/ARMJITInfo.h
View File

@ -49,6 +49,12 @@ namespace llvm {
///
virtual void replaceMachineCodeForFunction(void *Old, void *New);
/// emitGlobalValueNonLazyPtr - Use the specified MachineCodeEmitter object
/// to emit a Mac OS X non-lazy pointer which contains the address of the
/// specified ptr.
virtual void *emitGlobalValueNonLazyPtr(const GlobalValue *GV, void *Ptr,
MachineCodeEmitter &MCE);
/// emitFunctionStub - Use the specified MachineCodeEmitter object to emit a
/// small native function that simply calls the function at the specified
/// address.