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Foundation for call frame information.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27491 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Laskey
2006-04-07 16:34:46 +00:00
parent 38ab6d887c
commit 4188699f80
21 changed files with 359 additions and 65 deletions
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153
lib/CodeGen/DwarfWriter.cpp
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@@ -18,6 +18,7 @@
#include "llvm/Type.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineDebugInfo.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineLocation.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/CommandLine.h"
@@ -1073,8 +1074,6 @@ void DwarfWriter::EmitInt64(uint64_t Value) const {
if (Asm->Data64bitsDirective) {
O << Asm->Data64bitsDirective << "0x" << std::hex << Value << std::dec;
} else {
const TargetData &TD = Asm->TM.getTargetData();
if (TD.isBigEndian()) {
EmitInt32(unsigned(Value >> 32)); O << "\n";
EmitInt32(unsigned(Value));
@@ -1216,12 +1215,14 @@ void DwarfWriter::AddSourceLine(DIE *Die, CompileUnitDesc *File, unsigned Line)
/// AddAddress - Add an address attribute to a die based on the location
/// provided.
void DwarfWriter::AddAddress(DIE *Die, unsigned Attribute,
MachineLocation &Location) {
const MachineLocation &Location) {
DIEBlock *Block = new DIEBlock();
if (Location.isRegister()) {
Block->AddUInt(DW_FORM_data1, DW_OP_reg0 + Location.getRegister());
Block->AddUInt(DW_FORM_data1,
DW_OP_reg0 + RI->getDwarfRegNum(Location.getRegister()));
} else {
Block->AddUInt(DW_FORM_data1, DW_OP_breg0 + Location.getRegister());
Block->AddUInt(DW_FORM_data1,
DW_OP_breg0 + RI->getDwarfRegNum(Location.getRegister()));
Block->AddUInt(DW_FORM_sdata, Location.getOffset());
}
Block->ComputeSize(*this);
@@ -1358,8 +1359,7 @@ DIE *DwarfWriter::NewType(DIE *Context, TypeDesc *TyDesc, CompileUnit *Unit) {
// Now normalize offset to the field.
Offset -= FieldOffset;
// Maybe we need to work from the other.
const TargetData &TD = Asm->TM.getTargetData();
// Maybe we need to work from the other end.
if (TD.isLittleEndian()) Offset = FieldSize - (Offset + Size);
Member->AddUInt(DW_AT_byte_size, 0, FieldSize >> 3);
@@ -1515,8 +1515,11 @@ DIE *DwarfWriter::NewSubprogram(SubprogramDesc *SPD) {
DIE *SubprogramDie = new DIE(DW_TAG_subprogram);
SubprogramDie->AddString (DW_AT_name, DW_FORM_string, Name);
SubprogramDie->AddDIEntry (DW_AT_type, DW_FORM_ref4, Type);
SubprogramDie->AddUInt (DW_AT_external, DW_FORM_flag, IsExternal);
if (Type) {
SubprogramDie->AddDIEntry (DW_AT_type, DW_FORM_ref4, Type);
}
SubprogramDie->AddUInt (DW_AT_external, DW_FORM_flag, IsExternal);
SubprogramDie->AddUInt (DW_AT_prototyped, DW_FORM_flag, 1);
// Add source line info if available.
AddSourceLine(SubprogramDie, UnitDesc, SPD->getLine());
@@ -1561,7 +1564,7 @@ DIE *DwarfWriter::NewScopeVariable(DebugVariable *DV, CompileUnit *Unit) {
// Add variable address.
MachineLocation Location;
Asm->TM.getRegisterInfo()->getLocation(*MF, DV->getFrameIndex(), Location);
RI->getLocation(*MF, DV->getFrameIndex(), Location);
AddAddress(VariableDie, DW_AT_location, Location);
return VariableDie;
@@ -1621,18 +1624,20 @@ void DwarfWriter::ConstructRootScope(DebugScope *RootScope) {
// Get the compile unit context.
CompileUnitDesc *UnitDesc = static_cast<CompileUnitDesc *>(SPD->getContext());
CompileUnit *Unit = FindCompileUnit(UnitDesc);
CompileUnit *Unit = FindCompileUnit(UnitDesc);
// Generate the mangled name.
std::string MangledName = Asm->Mang->getValueName(MF->getFunction());
// Get the subprogram die.
DIE *SPDie = Unit->getDieMapSlotFor(SPD);
assert(SPDie && "Missing subprogram descriptor");
// Add the function bounds.
SPDie->AddLabel(DW_AT_low_pc, DW_FORM_addr,
DWLabel("func_begin", SubprogramCount));
SPDie->AddObjectLabel(DW_AT_low_pc, DW_FORM_addr, MangledName);
SPDie->AddLabel(DW_AT_high_pc, DW_FORM_addr,
DWLabel("func_end", SubprogramCount));
MachineLocation Location(Asm->TM.getRegisterInfo()->getFrameRegister(*MF));
MachineLocation Location(RI->getFrameRegister(*MF));
AddAddress(SPDie, DW_AT_frame_base, Location);
ConstructScope(RootScope, SPDie, Unit);
@@ -1792,6 +1797,50 @@ void DwarfWriter::SizeAndOffsets() {
}
}
/// EmitFrameMoves - Emit frame instructions to describe the layout of the
/// frame.
void DwarfWriter::EmitFrameMoves(const char *BaseLabel, unsigned BaseLabelID,
std::vector<MachineMove *> &Moves) {
for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
MachineMove *Move = Moves[i];
unsigned LabelID = Move->getLabelID();
const MachineLocation &Dst = Move->getDestination();
const MachineLocation &Src = Move->getSource();
// Advance row if new location.
if (BaseLabel && LabelID && BaseLabelID != LabelID) {
EmitULEB128Bytes(DW_CFA_advance_loc4);
EOL("DW_CFA_advance_loc4");
EmitDifference("loc", LabelID, BaseLabel, BaseLabelID);
EOL("");
BaseLabelID = LabelID;
BaseLabel = "loc";
}
// If advancing cfa.
if (Dst.isRegister() && Dst.getRegister() == MachineLocation::VirtualFP) {
if (!Src.isRegister()) {
if (Src.getRegister() == MachineLocation::VirtualFP) {
EmitULEB128Bytes(DW_CFA_def_cfa_offset);
EOL("DW_CFA_def_cfa_offset");
} else {
EmitULEB128Bytes(DW_CFA_def_cfa);
EOL("DW_CFA_def_cfa");
EmitULEB128Bytes(RI->getDwarfRegNum(Src.getRegister()));
EOL("Register");
}
EmitULEB128Bytes(Src.getOffset() / RI->getStackDirection());
EOL("Offset");
} else {
}
} else {
}
}
}
/// EmitDebugInfo - Emit the debug info section.
///
void DwarfWriter::EmitDebugInfo() const {
@@ -1999,10 +2048,10 @@ void DwarfWriter::EmitDebugLines() const {
O << "\n";
}
/// EmitDebugFrame - Emit visible names into a debug frame section.
/// EmitInitialDebugFrame - Emit common frame info into a debug frame section.
///
void DwarfWriter::EmitDebugFrame() {
// Start the dwarf pubnames section.
void DwarfWriter::EmitInitialDebugFrame() {
// Start the dwarf frame section.
Asm->SwitchSection(DwarfFrameSection, 0);
EmitDifference("frame_common_end", 0,
@@ -2014,20 +2063,49 @@ void DwarfWriter::EmitDebugFrame() {
EmitInt8(DW_CIE_VERSION); EOL("CIE Version");
EmitString(""); EOL("CIE Augmentation");
EmitULEB128Bytes(1); EOL("CIE Code Alignment Factor");
// FIXME - needs to change based on stack direction.
EmitSLEB128Bytes(-sizeof(int32_t)); EOL("CIE Data Alignment Factor");
// FIXME - hard coded for PPC (LR).
EmitInt8(0x41); EOL("CIE RA Column Hardcoded (PPC LR)");
// FIXME - hard coded for PPC 0(SP).
EmitULEB128Bytes(DW_CFA_def_cfa); EOL("DW_CFA_def_cfa");
EmitULEB128Bytes(1); EOL("PPC Register SP");
EmitULEB128Bytes(0); EOL("PPC offset 0 as in 0(SP)");
EmitSLEB128Bytes(RI->getStackDirection()); EOL("CIE Data Alignment Factor");
EmitInt8(RI->getDwarfRegNum(RI->getRARegister())); EOL("CIE RA Column");
std::vector<MachineMove *> Moves;
RI->getInitialFrameState(Moves);
EmitFrameMoves(NULL, 0, Moves);
for (unsigned i = 0, N = Moves.size(); i < N; ++i) delete Moves[i];
EmitAlign(2);
EmitLabel("frame_common_end", 0);
O << "\n";
}
/// EmitFunctionDebugFrame - Emit per function frame info into a debug frame
/// section.
void DwarfWriter::EmitFunctionDebugFrame() {
// Start the dwarf frame section.
Asm->SwitchSection(DwarfFrameSection, 0);
EmitDifference("frame_end", SubprogramCount,
"frame_begin", SubprogramCount);
EOL("Length of Frame Information Entry");
EmitLabel("frame_begin", SubprogramCount);
EmitReference("section_frame", 0); EOL("FDE CIE offset");
EmitReference("func_begin", SubprogramCount); EOL("FDE initial location");
EmitDifference("func_end", SubprogramCount,
"func_begin", SubprogramCount);
EOL("FDE address range");
std::vector<MachineMove *> &Moves = DebugInfo->getFrameMoves();
EmitFrameMoves("func_begin", SubprogramCount, Moves);
EmitAlign(2);
EmitLabel("frame_end", SubprogramCount);
O << "\n";
}
/// EmitDebugPubNames - Emit visible names into a debug pubnames section.
///
void DwarfWriter::EmitDebugPubNames() {
@@ -2208,6 +2286,9 @@ bool DwarfWriter::ShouldEmitDwarf() {
if (!didInitial) {
EmitInitial();
// Emit common frame information.
EmitInitialDebugFrame();
// Create all the compile unit DIEs.
ConstructCompileUnitDIEs();
@@ -2231,6 +2312,8 @@ bool DwarfWriter::ShouldEmitDwarf() {
DwarfWriter::DwarfWriter(std::ostream &OS, AsmPrinter *A)
: O(OS)
, Asm(A)
, TD(Asm->TM.getTargetData())
, RI(Asm->TM.getRegisterInfo())
, M(NULL)
, MF(NULL)
, DebugInfo(NULL)
@@ -2267,6 +2350,12 @@ DwarfWriter::~DwarfWriter() {
}
}
/// SetDebugInfo - Set DebugInfo when it's known that pass manager has
/// created it. Set by the target AsmPrinter.
void DwarfWriter::SetDebugInfo(MachineDebugInfo *DI) {
DebugInfo = DI;
}
/// BeginModule - Emit all Dwarf sections that should come prior to the content.
///
void DwarfWriter::BeginModule(Module *M) {
@@ -2300,9 +2389,6 @@ void DwarfWriter::EndModule() {
// Emit source line correspondence into a debug line section.
EmitDebugLines();
// Emit info into a debug frame section.
EmitDebugFrame();
// Emit info into a debug pubnames section.
EmitDebugPubNames();
@@ -2327,6 +2413,9 @@ void DwarfWriter::EndModule() {
void DwarfWriter::BeginFunction(MachineFunction *MF) {
this->MF = MF;
// Begin accumulating function debug information.
DebugInfo->BeginFunction(MF);
if (!ShouldEmitDwarf()) return;
EOL("Dwarf Begin Function");
@@ -2335,7 +2424,6 @@ void DwarfWriter::BeginFunction(MachineFunction *MF) {
EmitLabel("func_begin", ++SubprogramCount);
}
/// EndFunction - Gather and emit post-function debug information.
///
void DwarfWriter::EndFunction() {
@@ -2348,5 +2436,10 @@ void DwarfWriter::EndFunction() {
// Construct scopes for subprogram.
ConstructRootScope(DebugInfo->getRootScope());
DebugInfo->ClearScopes();
// Emit function frame information.
EmitFunctionDebugFrame();
// Clear function debug information.
DebugInfo->EndFunction();
}