mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-26 14:33:02 +02:00
d32e304f9c
This extends the work done in r233995 so that now getFragment (in addition to getSection) also works for variable symbols. With that the existing logic to decide if a-b can be computed works even if a or b are variables. Given that, the expression evaluation can avoid expanding variables as aggressively and that in turn lets the relocation code see the original variable. In order for this to work with the asm streamer, there is now a dummy fragment per section. It is used to assign a section to a symbol when no other fragment exists. This patch is a joint work by Maxim Ostapenko andy myself. llvm-svn: 249303
80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
//===-- ARMMCExpr.h - ARM specific MC expression classes --------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMMCEXPR_H
|
|
#define LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMMCEXPR_H
|
|
|
|
#include "llvm/MC/MCExpr.h"
|
|
|
|
namespace llvm {
|
|
|
|
class ARMMCExpr : public MCTargetExpr {
|
|
public:
|
|
enum VariantKind {
|
|
VK_ARM_None,
|
|
VK_ARM_HI16, // The R_ARM_MOVT_ABS relocation (:upper16: in the .s file)
|
|
VK_ARM_LO16 // The R_ARM_MOVW_ABS_NC relocation (:lower16: in the .s file)
|
|
};
|
|
|
|
private:
|
|
const VariantKind Kind;
|
|
const MCExpr *Expr;
|
|
|
|
explicit ARMMCExpr(VariantKind Kind, const MCExpr *Expr)
|
|
: Kind(Kind), Expr(Expr) {}
|
|
|
|
public:
|
|
/// @name Construction
|
|
/// @{
|
|
|
|
static const ARMMCExpr *create(VariantKind Kind, const MCExpr *Expr,
|
|
MCContext &Ctx);
|
|
|
|
static const ARMMCExpr *createUpper16(const MCExpr *Expr, MCContext &Ctx) {
|
|
return create(VK_ARM_HI16, Expr, Ctx);
|
|
}
|
|
|
|
static const ARMMCExpr *createLower16(const MCExpr *Expr, MCContext &Ctx) {
|
|
return create(VK_ARM_LO16, Expr, Ctx);
|
|
}
|
|
|
|
/// @}
|
|
/// @name Accessors
|
|
/// @{
|
|
|
|
/// getOpcode - Get the kind of this expression.
|
|
VariantKind getKind() const { return Kind; }
|
|
|
|
/// getSubExpr - Get the child of this expression.
|
|
const MCExpr *getSubExpr() const { return Expr; }
|
|
|
|
/// @}
|
|
|
|
void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
|
|
bool evaluateAsRelocatableImpl(MCValue &Res,
|
|
const MCAsmLayout *Layout,
|
|
const MCFixup *Fixup) const override {
|
|
return false;
|
|
}
|
|
void visitUsedExpr(MCStreamer &Streamer) const override;
|
|
MCFragment *findAssociatedFragment() const override {
|
|
return getSubExpr()->findAssociatedFragment();
|
|
}
|
|
|
|
// There are no TLS ARMMCExprs at the moment.
|
|
void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
|
|
|
|
static bool classof(const MCExpr *E) {
|
|
return E->getKind() == MCExpr::Target;
|
|
}
|
|
};
|
|
} // end namespace llvm
|
|
|
|
#endif
|