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Generalize debug info / EH emission in AsmPrinter 

llvm-svn: 196270
This commit is contained in:
Timur Iskhodzhanov 2013-12-03 12:05:18 +00:00
parent 8a25992f39
commit 4c719cf6c6
7 changed files with 164 additions and 76 deletions
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17
llvm/include/llvm/CodeGen/AsmPrinter.h
View File

@ -22,6 +22,7 @@
#include "llvm/Support/ErrorHandling.h"
namespace llvm {
class AsmPrinterHandler;
class BlockAddress;
class GCStrategy;
class Constant;
@ -110,13 +111,21 @@ namespace llvm {
/// function.
MachineLoopInfo *LI;
struct HandlerInfo {
AsmPrinterHandler *Handler;
const char *TimerName, *TimerGroupName;
HandlerInfo(AsmPrinterHandler *Handler, const char *TimerName,
const char *TimerGroupName)
: Handler(Handler), TimerName(TimerName),
TimerGroupName(TimerGroupName) {}
};
/// Handlers - a vector of all debug/EH info emitters we should use.
/// This vector maintains ownership of the emitters.
SmallVector<HandlerInfo, 1> Handlers;
/// DD - If the target supports dwarf debug info, this pointer is non-null.
DwarfDebug *DD;
/// DE - If the target supports dwarf exception info, this pointer is
/// non-null.
DwarfException *DE;
protected:
explicit AsmPrinter(TargetMachine &TM, MCStreamer &Streamer);

92
llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View File

@ -99,14 +99,14 @@ AsmPrinter::AsmPrinter(TargetMachine &tm, MCStreamer &Streamer)
OutContext(Streamer.getContext()),
OutStreamer(Streamer),
LastMI(0), LastFn(0), Counter(~0U), SetCounter(0) {
DD = 0; DE = 0; MMI = 0; LI = 0; MF = 0;
DD = 0; MMI = 0; LI = 0; MF = 0;
CurrentFnSym = CurrentFnSymForSize = 0;
GCMetadataPrinters = 0;
VerboseAsm = Streamer.isVerboseAsm();
}
AsmPrinter::~AsmPrinter() {
assert(DD == 0 && DE == 0 && "Debug/EH info didn't get finalized");
assert(DD == 0 && Handlers.empty() && "Debug/EH info didn't get finalized");
if (GCMetadataPrinters != 0) {
gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
@ -192,25 +192,29 @@ bool AsmPrinter::doInitialization(Module &M) {
OutStreamer.AddBlankLine();
}
if (MAI->doesSupportDebugInformation())
if (MAI->doesSupportDebugInformation()) {
DD = new DwarfDebug(this, &M);
Handlers.push_back(HandlerInfo(DD, DbgTimerName, DWARFGroupName));
}
DwarfException *DE = 0;
switch (MAI->getExceptionHandlingType()) {
case ExceptionHandling::None:
return false;
break;
case ExceptionHandling::SjLj:
case ExceptionHandling::DwarfCFI:
DE = new DwarfCFIException(this);
return false;
break;
case ExceptionHandling::ARM:
DE = new ARMException(this);
return false;
break;
case ExceptionHandling::Win64:
DE = new Win64Exception(this);
return false;
break;
}
llvm_unreachable("Unknown exception type.");
if (DE)
Handlers.push_back(HandlerInfo(DE, EHTimerName, DWARFGroupName));
return false;
}
void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
@ -311,8 +315,11 @@ void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
// sections and expected to be contiguous (e.g. ObjC metadata).
unsigned AlignLog = getGVAlignmentLog2(GV, *DL);
if (DD)
DD->setSymbolSize(GVSym, Size);
for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
const HandlerInfo &OI = Handlers[I];
NamedRegionTimer T(OI.TimerName, OI.TimerGroupName, TimePassesIsEnabled);
OI.Handler->setSymbolSize(GVSym, Size);
}
// Handle common and BSS local symbols (.lcomm).
if (GVKind.isCommon() || GVKind.isBSSLocal()) {
@ -482,13 +489,10 @@ void AsmPrinter::EmitFunctionHeader() {
}
// Emit pre-function debug and/or EH information.
if (DE) {
NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
DE->beginFunction(MF);
}
if (DD) {
NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
DD->beginFunction(MF);
for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
const HandlerInfo &OI = Handlers[I];
NamedRegionTimer T(OI.TimerName, OI.TimerGroupName, TimePassesIsEnabled);
OI.Handler->beginFunction(MF);
}
// Emit the prefix data.
@ -693,7 +697,7 @@ void AsmPrinter::EmitFunctionBody() {
// Emit target-specific gunk before the function body.
EmitFunctionBodyStart();
bool ShouldPrintDebugScopes = DD && MMI->hasDebugInfo();
bool ShouldPrintDebugScopes = MMI->hasDebugInfo();
// Print out code for the function.
bool HasAnyRealCode = false;
@ -714,8 +718,12 @@ void AsmPrinter::EmitFunctionBody() {
}
if (ShouldPrintDebugScopes) {
NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
DD->beginInstruction(II);
for (unsigned III = 0, EEE = Handlers.size(); III != EEE; ++III) {
const HandlerInfo &OI = Handlers[III];
NamedRegionTimer T(OI.TimerName, OI.TimerGroupName,
TimePassesIsEnabled);
OI.Handler->beginInstruction(II);
}
}
if (isVerbose())
@ -754,8 +762,12 @@ void AsmPrinter::EmitFunctionBody() {
}
if (ShouldPrintDebugScopes) {
NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
DD->endInstruction(II);
for (unsigned III = 0, EEE = Handlers.size(); III != EEE; ++III) {
const HandlerInfo &OI = Handlers[III];
NamedRegionTimer T(OI.TimerName, OI.TimerGroupName,
TimePassesIsEnabled);
OI.Handler->endInstruction();
}
}
}
}
@ -811,14 +823,11 @@ void AsmPrinter::EmitFunctionBody() {
OutStreamer.EmitELFSize(CurrentFnSym, SizeExp);
}
// Emit post-function debug information.
if (DD) {
NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
DD->endFunction(MF);
}
if (DE) {
NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
DE->endFunction();
// Emit post-function debug and/or EH information.
for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
const HandlerInfo &OI = Handlers[I];
NamedRegionTimer T(OI.TimerName, OI.TimerGroupName, TimePassesIsEnabled);
OI.Handler->endFunction();
}
MMI->EndFunction();
@ -907,20 +916,15 @@ bool AsmPrinter::doFinalization(Module &M) {
OutStreamer.Flush();
// Finalize debug and EH information.
if (DE) {
{
NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
DE->endModule();
}
delete DE; DE = 0;
}
if (DD) {
{
NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
DD->endModule();
}
delete DD; DD = 0;
for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
const HandlerInfo &OI = Handlers[I];
NamedRegionTimer T(OI.TimerName, OI.TimerGroupName,
TimePassesIsEnabled);
OI.Handler->endModule();
delete OI.Handler;
}
Handlers.clear();
DD = 0;
// If the target wants to know about weak references, print them all.
if (MAI->getWeakRefDirective()) {

53
llvm/lib/CodeGen/AsmPrinter/AsmPrinterHandler.h Normal file
View File

@ -0,0 +1,53 @@
//===-- lib/CodeGen/AsmPrinter/AsmPrinterHandler.h -------------*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a generic interface for AsmPrinter handlers,
// like debug and EH info emitters.
//
//===----------------------------------------------------------------------===//
#ifndef CODEGEN_ASMPRINTER_ASMPRINTERHANDLER_H__
#define CODEGEN_ASMPRINTER_ASMPRINTERHANDLER_H__
#include "llvm/Support/DataTypes.h"
namespace llvm {
class MachineFunction;
class MachineInstr;
class MCSymbol;
/// \brief Collects and handles AsmPrinter objects required to build debug
/// or EH information.
class AsmPrinterHandler {
public:
virtual ~AsmPrinterHandler() {}
/// \brief For symbols that have a size designated (e.g. common symbols),
/// this tracks that size.
virtual void setSymbolSize(const MCSymbol *Sym, uint64_t Size) = 0;
/// \brief Emit all sections that should come after the content.
virtual void endModule() = 0;
/// \brief Gather pre-function debug information.
virtual void beginFunction(const MachineFunction *MF) = 0;
/// \brief Gather post-function debug information.
virtual void endFunction() = 0;
/// \brief Process beginning of an instruction.
virtual void beginInstruction(const MachineInstr *MI) = 0;
/// \brief Process end of an instruction.
virtual void endInstruction() = 0;
};
} // End of namespace llvm
#endif

4
llvm/lib/CodeGen/AsmPrinter/DIE.cpp
View File

@ -390,7 +390,9 @@ unsigned DIEEntry::getRefAddrSize(AsmPrinter *AP) {
// specified to be four bytes in the DWARF 32-bit format and eight bytes
// in the DWARF 64-bit format, while DWARF Version 2 specifies that such
// references have the same size as an address on the target system.
if (AP->getDwarfDebug()->getDwarfVersion() == 2)
const DwarfDebug *DD = AP->getDwarfDebug();
assert(DD && "Expected Dwarf Debug info to be available");
if (DD->getDwarfVersion() == 2)
return AP->getDataLayout().getPointerSize();
return sizeof(int32_t);
}

44
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -197,6 +197,7 @@ DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
DwarfAddrSectionSym = 0;
DwarfAbbrevDWOSectionSym = DwarfStrDWOSectionSym = 0;
FunctionBeginSym = FunctionEndSym = 0;
CurFn = 0; CurMI = 0;
// Turn on accelerator tables for Darwin by default, pubnames by
// default for non-Darwin, and handle split dwarf.
@ -1144,6 +1145,7 @@ void DwarfDebug::endSections() {
// Emit all Dwarf sections that should come after the content.
void DwarfDebug::endModule() {
assert(CurFn == 0);
if (!FirstCU)
return;
@ -1225,8 +1227,7 @@ DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &DV,
}
// If Var is a current function argument then add it to CurrentFnArguments list.
bool DwarfDebug::addCurrentFnArgument(const MachineFunction *MF,
DbgVariable *Var, LexicalScope *Scope) {
bool DwarfDebug::addCurrentFnArgument(DbgVariable *Var, LexicalScope *Scope) {
if (!LScopes.isCurrentFunctionScope(Scope))
return false;
DIVariable DV = Var->getVariable();
@ -1238,7 +1239,7 @@ bool DwarfDebug::addCurrentFnArgument(const MachineFunction *MF,
size_t Size = CurrentFnArguments.size();
if (Size == 0)
CurrentFnArguments.resize(MF->getFunction()->arg_size());
CurrentFnArguments.resize(CurFn->getFunction()->arg_size());
// llvm::Function argument size is not good indicator of how many
// arguments does the function have at source level.
if (ArgNo > Size)
@ -1249,7 +1250,7 @@ bool DwarfDebug::addCurrentFnArgument(const MachineFunction *MF,
// Collect variable information from side table maintained by MMI.
void DwarfDebug::collectVariableInfoFromMMITable(
const MachineFunction *MF, SmallPtrSet<const MDNode *, 16> &Processed) {
SmallPtrSet<const MDNode *, 16> &Processed) {
MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
VE = VMap.end();
@ -1270,7 +1271,7 @@ void DwarfDebug::collectVariableInfoFromMMITable(
DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.second);
DbgVariable *RegVar = new DbgVariable(DV, AbsDbgVariable, this);
RegVar->setFrameIndex(VP.first);
if (!addCurrentFnArgument(MF, RegVar, Scope))
if (!addCurrentFnArgument(RegVar, Scope))
addScopeVariable(Scope, RegVar);
if (AbsDbgVariable)
AbsDbgVariable->setFrameIndex(VP.first);
@ -1317,11 +1318,10 @@ static DotDebugLocEntry getDebugLocEntry(AsmPrinter *Asm,
// Find variables for each lexical scope.
void
DwarfDebug::collectVariableInfo(const MachineFunction *MF,
SmallPtrSet<const MDNode *, 16> &Processed) {
DwarfDebug::collectVariableInfo(SmallPtrSet<const MDNode *, 16> &Processed) {
// Grab the variable info that was squirreled away in the MMI side-table.
collectVariableInfoFromMMITable(MF, Processed);
collectVariableInfoFromMMITable(Processed);
for (SmallVectorImpl<const MDNode *>::const_iterator
UVI = UserVariables.begin(),
@ -1341,7 +1341,7 @@ DwarfDebug::collectVariableInfo(const MachineFunction *MF,
DIVariable DV(Var);
LexicalScope *Scope = NULL;
if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
DISubprogram(DV.getContext()).describes(MF->getFunction()))
DISubprogram(DV.getContext()).describes(CurFn->getFunction()))
Scope = LScopes.getCurrentFunctionScope();
else if (MDNode *IA = DV.getInlinedAt())
Scope = LScopes.findInlinedScope(DebugLoc::getFromDILocation(IA));
@ -1355,7 +1355,7 @@ DwarfDebug::collectVariableInfo(const MachineFunction *MF,
assert(MInsn->isDebugValue() && "History must begin with debug value");
DbgVariable *AbsVar = findAbstractVariable(DV, MInsn->getDebugLoc());
DbgVariable *RegVar = new DbgVariable(DV, AbsVar, this);
if (!addCurrentFnArgument(MF, RegVar, Scope))
if (!addCurrentFnArgument(RegVar, Scope))
addScopeVariable(Scope, RegVar);
if (AbsVar)
AbsVar->setMInsn(MInsn);
@ -1437,6 +1437,8 @@ MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
// Process beginning of an instruction.
void DwarfDebug::beginInstruction(const MachineInstr *MI) {
assert(CurMI == 0);
CurMI = MI;
// Check if source location changes, but ignore DBG_VALUE locations.
if (!MI->isDebugValue()) {
DebugLoc DL = MI->getDebugLoc();
@ -1478,14 +1480,16 @@ void DwarfDebug::beginInstruction(const MachineInstr *MI) {
}
// Process end of an instruction.
void DwarfDebug::endInstruction(const MachineInstr *MI) {
void DwarfDebug::endInstruction() {
assert(CurMI != 0);
// Don't create a new label after DBG_VALUE instructions.
// They don't generate code.
if (!MI->isDebugValue())
if (!CurMI->isDebugValue())
PrevLabel = 0;
DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
LabelsAfterInsn.find(MI);
LabelsAfterInsn.find(CurMI);
CurMI = 0;
// No label needed.
if (I == LabelsAfterInsn.end())
@ -1565,6 +1569,7 @@ static DebugLoc getFnDebugLoc(DebugLoc DL, const LLVMContext &Ctx) {
// Gather pre-function debug information. Assumes being called immediately
// after the function entry point has been emitted.
void DwarfDebug::beginFunction(const MachineFunction *MF) {
CurFn = MF;
// If there's no debug info for the function we're not going to do anything.
if (!MMI->hasDebugInfo())
@ -1791,9 +1796,13 @@ void DwarfDebug::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
}
// Gather and emit post-function debug information.
void DwarfDebug::endFunction(const MachineFunction *MF) {
if (!MMI->hasDebugInfo() || LScopes.empty())
void DwarfDebug::endFunction() {
assert(CurFn != 0);
if (!MMI->hasDebugInfo() || LScopes.empty()) {
CurFn = 0;
return;
}
// Define end label for subprogram.
FunctionEndSym = Asm->GetTempSymbol("func_end", Asm->getFunctionNumber());
@ -1803,7 +1812,7 @@ void DwarfDebug::endFunction(const MachineFunction *MF) {
Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
SmallPtrSet<const MDNode *, 16> ProcessedVars;
collectVariableInfo(MF, ProcessedVars);
collectVariableInfo(ProcessedVars);
LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
CompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
@ -1837,7 +1846,7 @@ void DwarfDebug::endFunction(const MachineFunction *MF) {
DIE *CurFnDIE = constructScopeDIE(TheCU, FnScope);
if (!MF->getTarget().Options.DisableFramePointerElim(*MF))
if (!CurFn->getTarget().Options.DisableFramePointerElim(*CurFn))
TheCU->addFlag(CurFnDIE, dwarf::DW_AT_APPLE_omit_frame_ptr);
// Clear debug info
@ -1853,6 +1862,7 @@ void DwarfDebug::endFunction(const MachineFunction *MF) {
LabelsBeforeInsn.clear();
LabelsAfterInsn.clear();
PrevLabel = NULL;
CurFn = 0;
}
// Register a source line with debug info. Returns the unique label that was

22
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
View File

@ -14,6 +14,7 @@
#ifndef CODEGEN_ASMPRINTER_DWARFDEBUG_H__
#define CODEGEN_ASMPRINTER_DWARFDEBUG_H__
#include "AsmPrinterHandler.h"
#include "DIE.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/FoldingSet.h"
@ -316,7 +317,7 @@ struct SymbolCU {
};
/// \brief Collects and handles dwarf debug information.
class DwarfDebug {
class DwarfDebug : public AsmPrinterHandler {
// Target of Dwarf emission.
AsmPrinter *Asm;
@ -418,6 +419,12 @@ class DwarfDebug {
// body.
DebugLoc PrologEndLoc;
// If nonnull, stores the current machine function we're processing.
const MachineFunction *CurFn;
// If nonnull, stores the current machine instruction we're processing.
const MachineInstr *CurMI;
// Section Symbols: these are assembler temporary labels that are emitted at
// the beginning of each supported dwarf section. These are used to form
// section offsets and are created by EmitSectionLabels.
@ -648,17 +655,14 @@ class DwarfDebug {
/// \brief If Var is an current function argument that add it in
/// CurrentFnArguments list.
bool addCurrentFnArgument(const MachineFunction *MF,
DbgVariable *Var, LexicalScope *Scope);
bool addCurrentFnArgument(DbgVariable *Var, LexicalScope *Scope);
/// \brief Populate LexicalScope entries with variables' info.
void collectVariableInfo(const MachineFunction *,
SmallPtrSet<const MDNode *, 16> &ProcessedVars);
void collectVariableInfo(SmallPtrSet<const MDNode *, 16> &ProcessedVars);
/// \brief Collect variable information from the side table maintained
/// by MMI.
void collectVariableInfoFromMMITable(const MachineFunction * MF,
SmallPtrSet<const MDNode *, 16> &P);
void collectVariableInfoFromMMITable(SmallPtrSet<const MDNode *, 16> &P);
/// \brief Ensure that a label will be emitted before MI.
void requestLabelBeforeInsn(const MachineInstr *MI) {
@ -700,13 +704,13 @@ public:
void beginFunction(const MachineFunction *MF);
/// \brief Gather and emit post-function debug information.
void endFunction(const MachineFunction *MF);
void endFunction();
/// \brief Process beginning of an instruction.
void beginInstruction(const MachineInstr *MI);
/// \brief Process end of an instruction.
void endInstruction(const MachineInstr *MI);
void endInstruction();
/// \brief Add a DIE to the set of types that we're going to pull into
/// type units.

8
llvm/lib/CodeGen/AsmPrinter/DwarfException.h
View File

@ -14,6 +14,7 @@
#ifndef LLVM_CODEGEN_ASMPRINTER_DWARFEXCEPTION_H
#define LLVM_CODEGEN_ASMPRINTER_DWARFEXCEPTION_H
#include "AsmPrinterHandler.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include <vector>
@ -35,7 +36,7 @@ class AsmPrinter;
//===----------------------------------------------------------------------===//
/// DwarfException - Emits Dwarf exception handling directives.
///
class DwarfException {
class DwarfException : public AsmPrinterHandler {
protected:
/// Asm - Target of Dwarf emission.
AsmPrinter *Asm;
@ -140,6 +141,11 @@ public:
/// endFunction - Gather and emit post-function exception information.
virtual void endFunction();
// We don't need these.
virtual void setSymbolSize(const MCSymbol *Sym, uint64_t Size) {}
virtual void beginInstruction(const MachineInstr *MI) {}
virtual void endInstruction() {}
};
class DwarfCFIException : public DwarfException {