Move EmitFrameMoves into AsmPrinter.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100371 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp b/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
index 9e7f182..b310578 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
@@ -13,17 +13,24 @@
#define DEBUG_TYPE "asm-printer"
#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineLocation.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/Dwarf.h"
using namespace llvm;
+//===----------------------------------------------------------------------===//
+// Dwarf Emission Helper Routines
+//===----------------------------------------------------------------------===//
+
/// EmitSLEB128 - emit the specified signed leb128 value.
void AsmPrinter::EmitSLEB128(int Value, const char *Desc) const {
if (isVerbose() && Desc)
@@ -118,7 +125,7 @@
/// encoding. If verbose assembly output is enabled, we output comments
/// describing the encoding. Desc is an optional string saying what the
/// encoding is specifying (e.g. "LSDA").
-void AsmPrinter::EmitEncodingByte(unsigned Val, const char *Desc) {
+void AsmPrinter::EmitEncodingByte(unsigned Val, const char *Desc) const {
if (isVerbose()) {
if (Desc != 0)
OutStreamer.AddComment(Twine(Desc)+" Encoding = " +
@@ -196,4 +203,77 @@
EmitLabelDifference(Label, SectionLabel, 4);
}
+//===----------------------------------------------------------------------===//
+// Dwarf Lowering Routines
+//===----------------------------------------------------------------------===//
+
+/// EmitFrameMoves - Emit frame instructions to describe the layout of the
+/// frame.
+void AsmPrinter::EmitFrameMoves(const std::vector<MachineMove> &Moves,
+ MCSymbol *BaseLabel, bool isEH) const {
+ const TargetRegisterInfo *RI = TM.getRegisterInfo();
+
+ int stackGrowth = TM.getTargetData()->getPointerSize();
+ if (TM.getFrameInfo()->getStackGrowthDirection() !=
+ TargetFrameInfo::StackGrowsUp)
+ stackGrowth *= -1;
+
+ for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
+ const MachineMove &Move = Moves[i];
+ MCSymbol *Label = Move.getLabel();
+ // Throw out move if the label is invalid.
+ if (Label && !Label->isDefined()) continue; // Not emitted, in dead code.
+
+ const MachineLocation &Dst = Move.getDestination();
+ const MachineLocation &Src = Move.getSource();
+
+ // Advance row if new location.
+ if (BaseLabel && Label) {
+ MCSymbol *ThisSym = Label;
+ if (ThisSym != BaseLabel) {
+ EmitCFAByte(dwarf::DW_CFA_advance_loc4);
+ EmitLabelDifference(ThisSym, BaseLabel, 4);
+ BaseLabel = ThisSym;
+ }
+ }
+
+ // If advancing cfa.
+ if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
+ assert(!Src.isReg() && "Machine move not supported yet.");
+
+ if (Src.getReg() == MachineLocation::VirtualFP) {
+ EmitCFAByte(dwarf::DW_CFA_def_cfa_offset);
+ } else {
+ EmitCFAByte(dwarf::DW_CFA_def_cfa);
+ EmitULEB128(RI->getDwarfRegNum(Src.getReg(), isEH), "Register");
+ }
+
+ EmitULEB128(-Src.getOffset(), "Offset");
+ continue;
+ }
+
+ if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) {
+ assert(Dst.isReg() && "Machine move not supported yet.");
+ EmitCFAByte(dwarf::DW_CFA_def_cfa_register);
+ EmitULEB128(RI->getDwarfRegNum(Dst.getReg(), isEH), "Register");
+ continue;
+ }
+
+ unsigned Reg = RI->getDwarfRegNum(Src.getReg(), isEH);
+ int Offset = Dst.getOffset() / stackGrowth;
+
+ if (Offset < 0) {
+ EmitCFAByte(dwarf::DW_CFA_offset_extended_sf);
+ EmitULEB128(Reg, "Reg");
+ EmitSLEB128(Offset, "Offset");
+ } else if (Reg < 64) {
+ EmitCFAByte(dwarf::DW_CFA_offset + Reg);
+ EmitULEB128(Offset, "Offset");
+ } else {
+ EmitCFAByte(dwarf::DW_CFA_offset_extended);
+ EmitULEB128(Reg, "Reg");
+ EmitULEB128(Offset, "Offset");
+ }
+ }
+}