[llvm-commits] [llvm] r123474 - in /llvm/trunk: include/llvm/CodeGen/AsmPrinter.h lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp lib/CodeGen/AsmPrinter/DwarfCFIException.cpp lib/CodeGen/AsmPrinter/DwarfException.h
Anton Korobeynikov
asl at math.spbu.ru
Fri Jan 14 13:57:53 PST 2011
Author: asl
Date: Fri Jan 14 15:57:53 2011
New Revision: 123474
URL: http://llvm.org/viewvc/llvm-project?rev=123474&view=rev
Log:
Add CFI directives-based frame information emission. Not hooked yet.
Added:
llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
Modified:
llvm/trunk/include/llvm/CodeGen/AsmPrinter.h
llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
llvm/trunk/lib/CodeGen/AsmPrinter/DwarfException.h
Modified: llvm/trunk/include/llvm/CodeGen/AsmPrinter.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/AsmPrinter.h?rev=123474&r1=123473&r2=123474&view=diff
==============================================================================
--- llvm/trunk/include/llvm/CodeGen/AsmPrinter.h (original)
+++ llvm/trunk/include/llvm/CodeGen/AsmPrinter.h Fri Jan 14 15:57:53 2011
@@ -389,7 +389,7 @@
/// frame.
void EmitFrameMoves(const std::vector<MachineMove> &Moves,
MCSymbol *BaseLabel, bool isEH) const;
-
+ void EmitCFIFrameMoves(const std::vector<MachineMove> &Moves) const;
//===------------------------------------------------------------------===//
// Inline Asm Support
Modified: llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp?rev=123474&r1=123473&r2=123474&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp (original)
+++ llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp Fri Jan 14 15:57:53 2011
@@ -276,3 +276,43 @@
}
}
}
+
+/// EmitFrameMoves - Emit frame instructions to describe the layout of the
+/// frame.
+void AsmPrinter::EmitCFIFrameMoves(const std::vector<MachineMove> &Moves) const {
+ const TargetRegisterInfo *RI = TM.getRegisterInfo();
+
+ int stackGrowth = TM.getTargetData()->getPointerSize();
+ if (TM.getFrameLowering()->getStackGrowthDirection() !=
+ TargetFrameLowering::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();
+
+ // If advancing cfa.
+ if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
+ assert(!Src.isReg() && "Machine move not supported yet.");
+
+ if (Src.getReg() == MachineLocation::VirtualFP) {
+ OutStreamer.EmitCFIDefCfaOffset(-Src.getOffset());
+ } else {
+ assert("Machine move not supported yet");
+ // Reg + Offset
+ }
+ } else if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) {
+ assert(Dst.isReg() && "Machine move not supported yet.");
+ OutStreamer.EmitCFIDefCfaRegister(RI->getDwarfRegNum(Dst.getReg(), true));
+ } else {
+ assert(!Dst.isReg() && "Machine move not supported yet.");
+ OutStreamer.EmitCFIOffset(RI->getDwarfRegNum(Src.getReg(), true),
+ Dst.getOffset());
+ }
+ }
+}
Added: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCFIException.cpp?rev=123474&view=auto
==============================================================================
--- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCFIException.cpp (added)
+++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCFIException.cpp Fri Jan 14 15:57:53 2011
@@ -0,0 +1,138 @@
+//===-- CodeGen/AsmPrinter/DwarfException.cpp - Dwarf Exception Impl ------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for writing DWARF exception info into asm files.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DwarfException.h"
+#include "llvm/Module.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineLocation.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Target/Mangler.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetFrameLowering.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Support/Dwarf.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/Twine.h"
+using namespace llvm;
+
+DwarfCFIException::DwarfCFIException(AsmPrinter *A)
+ : DwarfException(A),
+ shouldEmitTable(false), shouldEmitMoves(false), shouldEmitTableModule(false)
+ {}
+
+DwarfCFIException::~DwarfCFIException() {}
+
+/// EndModule - Emit all exception information that should come after the
+/// content.
+void DwarfCFIException::EndModule() {
+ if (Asm->MAI->getExceptionHandlingType() != ExceptionHandling::Dwarf)
+ return;
+
+ if (!shouldEmitTableModule)
+ return;
+
+ const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
+ unsigned PerEncoding = TLOF.getPersonalityEncoding();
+
+ // Begin eh frame section.
+ Asm->OutStreamer.SwitchSection(TLOF.getEHFrameSection());
+
+ // Emit references to all used personality functions
+ const std::vector<const Function*> &Personalities = MMI->getPersonalities();
+ for (size_t i = 0, e = Personalities.size(); i != e; ++i) {
+ Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("personality", i));
+ Asm->EmitReference(Personalities[i], PerEncoding);
+ }
+}
+
+/// BeginFunction - Gather pre-function exception information. Assumes it's
+/// being emitted immediately after the function entry point.
+void DwarfCFIException::BeginFunction(const MachineFunction *MF) {
+ shouldEmitTable = shouldEmitMoves = false;
+
+ // If any landing pads survive, we need an EH table.
+ shouldEmitTable = !MMI->getLandingPads().empty();
+
+ // See if we need frame move info.
+ shouldEmitMoves =
+ !Asm->MF->getFunction()->doesNotThrow() || UnwindTablesMandatory;
+
+ if (shouldEmitMoves || shouldEmitTable)
+ // Assumes in correct section after the entry point.
+ Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
+ Asm->getFunctionNumber()));
+
+ shouldEmitTableModule |= shouldEmitTable;
+
+ if (shouldEmitMoves) {
+ const TargetFrameLowering *TFL = Asm->TM.getFrameLowering();
+ Asm->OutStreamer.EmitCFIStartProc();
+
+ // Indicate locations of general callee saved registers in frame.
+ std::vector<MachineMove> Moves;
+ TFL->getInitialFrameState(Moves);
+ Asm->EmitCFIFrameMoves(Moves);
+ Asm->EmitCFIFrameMoves(MMI->getFrameMoves());
+ }
+
+ if (!shouldEmitTable)
+ return;
+
+ const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
+
+ // Provide LSDA information.
+ unsigned LSDAEncoding = TLOF.getLSDAEncoding();
+ if (LSDAEncoding != dwarf::DW_EH_PE_omit)
+ Asm->OutStreamer.EmitCFILsda(Asm->GetTempSymbol("exception",
+ Asm->getFunctionNumber()),
+ LSDAEncoding);
+
+ // Indicate personality routine, if any.
+ unsigned PerEncoding = TLOF.getPersonalityEncoding();
+ if (PerEncoding != dwarf::DW_EH_PE_omit &&
+ MMI->getPersonalities()[MMI->getPersonalityIndex()])
+ Asm->OutStreamer.EmitCFIPersonality(Asm->GetTempSymbol("personality",
+ MMI->getPersonalityIndex()),
+ PerEncoding);
+}
+
+/// EndFunction - Gather and emit post-function exception information.
+///
+void DwarfCFIException::EndFunction() {
+ if (!shouldEmitMoves && !shouldEmitTable) return;
+
+ if (shouldEmitMoves)
+ Asm->OutStreamer.EmitCFIEndProc();
+
+ Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
+ Asm->getFunctionNumber()));
+
+ // Map all labels and get rid of any dead landing pads.
+ MMI->TidyLandingPads();
+
+ if (shouldEmitTable)
+ EmitExceptionTable();
+}
Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfException.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfException.h?rev=123474&r1=123473&r2=123474&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfException.h (original)
+++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfException.h Fri Jan 14 15:57:53 2011
@@ -139,6 +139,37 @@
virtual void EndFunction();
};
+class DwarfCFIException : public DwarfException {
+ /// shouldEmitTable - Per-function flag to indicate if EH tables should
+ /// be emitted.
+ bool shouldEmitTable;
+
+ /// shouldEmitMoves - Per-function flag to indicate if frame moves info
+ /// should be emitted.
+ bool shouldEmitMoves;
+
+ /// shouldEmitTableModule - Per-module flag to indicate if EH tables
+ /// should be emitted.
+ bool shouldEmitTableModule;
+public:
+ //===--------------------------------------------------------------------===//
+ // Main entry points.
+ //
+ DwarfCFIException(AsmPrinter *A);
+ virtual ~DwarfCFIException();
+
+ /// EndModule - Emit all exception information that should come after the
+ /// content.
+ virtual void EndModule();
+
+ /// BeginFunction - Gather pre-function exception information. Assumes being
+ /// emitted immediately after the function entry point.
+ virtual void BeginFunction(const MachineFunction *MF);
+
+ /// EndFunction - Gather and emit post-function exception information.
+ virtual void EndFunction();
+};
+
class DwarfTableException : public DwarfException {
/// shouldEmitTable - Per-function flag to indicate if EH tables should
/// be emitted.
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