[llvm-commits] CVS: llvm/lib/CodeGen/AsmPrinter.cpp DwarfWriter.cpp MachineDebugInfo.cpp
Jim Laskey
jlaskey at apple.com
Thu Jan 26 12:22:00 PST 2006
Changes in directory llvm/lib/CodeGen:
AsmPrinter.cpp updated: 1.39 -> 1.40
DwarfWriter.cpp updated: 1.17 -> 1.18
MachineDebugInfo.cpp updated: 1.4 -> 1.5
---
Log message:
Set up MachineDebugInfo to scan for debug information form "llvm.db"g globals.
Global Variable information is now pulled from "llvm.dbg.globals"
---
Diffs of the changes: (+289 -16)
AsmPrinter.cpp | 5
DwarfWriter.cpp | 31 ++---
MachineDebugInfo.cpp | 269 +++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 289 insertions(+), 16 deletions(-)
Index: llvm/lib/CodeGen/AsmPrinter.cpp
diff -u llvm/lib/CodeGen/AsmPrinter.cpp:1.39 llvm/lib/CodeGen/AsmPrinter.cpp:1.40
--- llvm/lib/CodeGen/AsmPrinter.cpp:1.39 Mon Jan 23 22:15:29 2006
+++ llvm/lib/CodeGen/AsmPrinter.cpp Thu Jan 26 14:21:46 2006
@@ -78,6 +78,11 @@
<< "\n" << CommentString << " End of file scope inline assembly\n";
SwitchSection("", 0); // Reset back to no section.
+
+ if (MachineDebugInfo *DebugInfo = getAnalysisToUpdate<MachineDebugInfo>()) {
+ DebugInfo->AnalyzeModule(M);
+ }
+
return false;
}
Index: llvm/lib/CodeGen/DwarfWriter.cpp
diff -u llvm/lib/CodeGen/DwarfWriter.cpp:1.17 llvm/lib/CodeGen/DwarfWriter.cpp:1.18
--- llvm/lib/CodeGen/DwarfWriter.cpp:1.17 Wed Jan 25 11:18:50 2006
+++ llvm/lib/CodeGen/DwarfWriter.cpp Thu Jan 26 14:21:46 2006
@@ -18,6 +18,7 @@
#include "llvm/Type.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineDebugInfo.h"
+#include "llvm/Support/Dwarf.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Target/TargetMachine.h"
@@ -1719,28 +1720,26 @@
/// variables.
void DwarfWriter::ConstructGlobalDIEs(Module &M) {
const TargetData &TD = Asm->TM.getTargetData();
-
- // Iterate throu each of the globals.
- for (Module::const_global_iterator GI = M.global_begin(), GE = M.global_end();
- GI != GE; ++GI) {
- if (!GI->hasInitializer()) continue; // External global require no code
-
- // Check to see if this is a special global used by LLVM, if so, emit it.
- if (GI->hasAppendingLinkage() && (GI->getName() == "llvm.global_ctors" ||
- GI->getName() == "llvm.global_dtors"))
- continue;
+
+ std::vector<GlobalWrapper> GlobalVariables = DebugInfo->getGlobalVariables(M);
+
+ for (unsigned i = 0, N = GlobalVariables.size(); i < N; ++i) {
+ GlobalWrapper &GW = GlobalVariables[i];
+ GlobalVariable *GV = GW.getGlobalVariable();
- std::string Name = Asm->Mang->getValueName(GI);
- Constant *C = GI->getInitializer();
+ if (!GV->hasInitializer()) continue; // External global require no code
+
+ // FIXME - Use global info type information when available.
+ std::string Name = Asm->Mang->getValueName(GV);
+ Constant *C = GV->getInitializer();
const Type *Ty = C->getType();
unsigned Size = TD.getTypeSize(Ty);
unsigned Align = TD.getTypeAlignmentShift(Ty);
if (C->isNullValue() && /* FIXME: Verify correct */
- (GI->hasInternalLinkage() || GI->hasWeakLinkage() ||
- GI->hasLinkOnceLinkage())) {
+ (GV->hasInternalLinkage() || GV->hasWeakLinkage() ||
+ GV->hasLinkOnceLinkage())) {
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
-
}
/// FIXME - Get correct compile unit context.
@@ -1748,7 +1747,7 @@
DWContext *Context = CompileUnits[0]->getContext();
/// Create new global.
- NewGlobalVariable(Context, GI->getName(), Name, Ty, Size, Align);
+ NewGlobalVariable(Context, GV->getName(), Name, Ty, Size, Align);
}
}
Index: llvm/lib/CodeGen/MachineDebugInfo.cpp
diff -u llvm/lib/CodeGen/MachineDebugInfo.cpp:1.4 llvm/lib/CodeGen/MachineDebugInfo.cpp:1.5
--- llvm/lib/CodeGen/MachineDebugInfo.cpp:1.4 Tue Jan 17 11:31:53 2006
+++ llvm/lib/CodeGen/MachineDebugInfo.cpp Thu Jan 26 14:21:46 2006
@@ -9,6 +9,13 @@
#include "llvm/CodeGen/MachineDebugInfo.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Intrinsics.h"
+#include "llvm/Instructions.h"
+#include "llvm/Module.h"
+#include "llvm/Support/Dwarf.h"
+
using namespace llvm;
// Handle the Pass registration stuff necessary to use TargetData's.
@@ -16,8 +23,220 @@
RegisterPass<MachineDebugInfo> X("machinedebuginfo", "Debug Information");
}
+//===----------------------------------------------------------------------===//
+
+/// getGlobalVariablesUsing - Return all of the global variables which have the
+/// specified value in their initializer somewhere.
+static void
+getGlobalVariablesUsing(Value *V, std::vector<GlobalVariable*> &Result) {
+ // Scan though value users.
+ for (Value::use_iterator I = V->use_begin(), E = V->use_end(); I != E; ++I) {
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(*I)) {
+ // If the user is a global variable then add to result.
+ Result.push_back(GV);
+ } else if (Constant *C = dyn_cast<Constant>(*I)) {
+ // If the user is a constant variable then scan its users
+ getGlobalVariablesUsing(C, Result);
+ }
+ }
+}
+
+/// getGlobalVariablesUsing - Return all of the global variables that use the
+/// named global variable.
+static std::vector<GlobalVariable*>
+getGlobalVariablesUsing(Module &M, const std::string &RootName) {
+ std::vector<GlobalVariable*> Result; // Global variables matching criteria.
+
+ // Get the global variable root.
+ GlobalVariable *UseRoot = M.getGlobalVariable(RootName,
+ StructType::get(std::vector<const Type*>()));
+
+ // If present and linkonce then scan for users.
+ if (UseRoot && UseRoot->hasLinkOnceLinkage()) {
+ getGlobalVariablesUsing(UseRoot, Result);
+ }
+
+ return Result;
+}
+
+/// getStringValue - Turn an LLVM constant pointer that eventually points to a
+/// global into a string value. Return an empty string if we can't do it.
+///
+const static std::string getStringValue(Value *V, unsigned Offset = 0) {
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V)) {
+ if (GV->hasInitializer() && isa<ConstantArray>(GV->getInitializer())) {
+ ConstantArray *Init = cast<ConstantArray>(GV->getInitializer());
+ if (Init->isString()) {
+ std::string Result = Init->getAsString();
+ if (Offset < Result.size()) {
+ // If we are pointing INTO The string, erase the beginning...
+ Result.erase(Result.begin(), Result.begin()+Offset);
+
+ // Take off the null terminator, and any string fragments after it.
+ std::string::size_type NullPos = Result.find_first_of((char)0);
+ if (NullPos != std::string::npos)
+ Result.erase(Result.begin()+NullPos, Result.end());
+ return Result;
+ }
+ }
+ }
+ } else if (Constant *C = dyn_cast<Constant>(V)) {
+ if (GlobalValue *GV = dyn_cast<GlobalValue>(C))
+ return getStringValue(GV, Offset);
+ else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
+ if (CE->getOpcode() == Instruction::GetElementPtr) {
+ // Turn a gep into the specified offset.
+ if (CE->getNumOperands() == 3 &&
+ cast<Constant>(CE->getOperand(1))->isNullValue() &&
+ isa<ConstantInt>(CE->getOperand(2))) {
+ return getStringValue(CE->getOperand(0),
+ Offset+cast<ConstantInt>(CE->getOperand(2))->getRawValue());
+ }
+ }
+ }
+ }
+ return "";
+}
+
+//===----------------------------------------------------------------------===//
+
+DebugInfoWrapper::DebugInfoWrapper(GlobalVariable *G)
+: GV(G)
+, IC(dyn_cast<ConstantStruct>(GV->getInitializer())) {
+ assert(IC && "llvm.db.global is missing structured constant");
+}
+
+//===----------------------------------------------------------------------===//
+
+CompileUnitWrapper::CompileUnitWrapper(GlobalVariable *G)
+: DebugInfoWrapper(G)
+{
+ // FIXME - should probably ease up on the number of operands (version.)
+ assert(IC->getNumOperands() == 7 &&
+ "Compile unit does not have correct number of operands");
+}
+
+/// getTag - Return the compile unit's tag number. Currently should be
+/// DW_TAG_variable.
+unsigned CompileUnitWrapper::getTag() const {
+ ConstantUInt *CI = dyn_cast<ConstantUInt>(IC->getOperand(0));
+ assert(CI && "Compile unit tag not an unsigned integer");
+ return CI->getValue();
+}
+
+/// isCorrectDebugVersion - Return true if is the correct llvm debug version.
+/// Currently the value is 0 (zero.) If the value is is not correct then
+/// ignore all debug information.
+bool CompileUnitWrapper::isCorrectDebugVersion() const {
+ ConstantUInt *CI = dyn_cast<ConstantUInt>(IC->getOperand(1));
+ assert(CI && "Compile unit debug version not an unsigned integer");
+ return CI->getValue() == 0;
+}
+
+/// getLanguage - Return the compile unit's language number (ex. DW_LANG_C89.)
+///
+unsigned CompileUnitWrapper::getLanguage() const {
+ ConstantUInt *CI = dyn_cast<ConstantUInt>(IC->getOperand(2));
+ assert(CI && "Compile unit language number not an unsigned integer");
+ return CI->getValue();
+}
+
+/// getFileName - Return the compile unit's file name.
+///
+const std::string CompileUnitWrapper::getFileName() const {
+ return getStringValue(IC->getOperand(3));
+}
+
+/// getDirectory - Return the compile unit's file directory.
+///
+const std::string CompileUnitWrapper::getDirectory() const {
+ return getStringValue(IC->getOperand(4));
+}
+/// getProducer - Return the compile unit's generator name.
+///
+const std::string CompileUnitWrapper::getProducer() const {
+ return getStringValue(IC->getOperand(5));
+}
+
//===----------------------------------------------------------------------===//
+
+GlobalWrapper::GlobalWrapper(GlobalVariable *G)
+: DebugInfoWrapper(G)
+{
+ // FIXME - should probably ease up on the number of operands (version.)
+ assert(IC->getNumOperands() == 8 &&
+ "Global does not have correct number of operands");
+}
+
+/// getTag - Return the global's tag number. Currently should be
+/// DW_TAG_variable or DW_TAG_subprogram.
+unsigned GlobalWrapper::getTag() const {
+ ConstantUInt *CI = dyn_cast<ConstantUInt>(IC->getOperand(0));
+ assert(CI && "Global tag not an unsigned integer");
+ return CI->getValue();
+}
+
+/// getContext - Return the "lldb.compile_unit" context global.
+///
+GlobalVariable *GlobalWrapper::getContext() const {
+ return dyn_cast<GlobalVariable>(IC->getOperand(1));
+}
+
+/// getName - Return the name of the global.
+///
+const std::string GlobalWrapper::getName() const {
+ return getStringValue(IC->getOperand(2));
+}
+
+/// getType - Return the type of the global.
+///
+const GlobalVariable *GlobalWrapper::getType() const {
+ return dyn_cast<GlobalVariable>(IC->getOperand(4));
+}
+
+/// isStatic - Return true if the global is static.
+///
+bool GlobalWrapper::isStatic() const {
+ ConstantBool *CB = dyn_cast<ConstantBool>(IC->getOperand(5));
+ assert(CB && "Global static flag is not boolean");
+ return CB->getValue();
+}
+
+/// isDefinition - Return true if the global is a definition.
+///
+bool GlobalWrapper::isDefinition() const {
+ ConstantBool *CB = dyn_cast<ConstantBool>(IC->getOperand(6));
+ assert(CB && "Global definition flag is not boolean");
+ return CB->getValue();
+}
+
+/// getGlobalVariable - Return the global variable (tag == DW_TAG_variable.)
+///
+GlobalVariable *GlobalWrapper::getGlobalVariable() const {
+ ConstantExpr *CE = dyn_cast<ConstantExpr>(IC->getOperand(7));
+ assert(CE && CE->getOpcode() == Instruction::Cast &&
+ "Global location is not a cast of GlobalVariable");
+ GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getOperand(0));
+ assert(GV && "Global location is not a cast of GlobalVariable");
+ return GV;
+}
+
+//===----------------------------------------------------------------------===//
+
+
+MachineDebugInfo::MachineDebugInfo()
+: CompileUnits()
+, Directories()
+, SourceFiles()
+, Lines()
+{
+
+}
+MachineDebugInfo::~MachineDebugInfo() {
+
+}
+
/// doInitialization - Initialize the debug state for a new module.
///
bool MachineDebugInfo::doInitialization() {
@@ -29,3 +248,53 @@
bool MachineDebugInfo::doFinalization() {
return false;
}
+
+/// AnalyzeModule - Scan the module for global debug information.
+///
+void MachineDebugInfo::AnalyzeModule(Module &M) {
+ SetupCompileUnits(M);
+}
+
+/// SetupCompileUnits - Set up the unique vector of compile units.
+///
+void MachineDebugInfo::SetupCompileUnits(Module &M) {
+ // Get vector of all debug compile units.
+ std::vector<GlobalVariable*> Globals =
+ getGlobalVariablesUsing(M, "llvm.dbg.translation_units");
+
+ // Scan all compile unit globals.
+ for (unsigned i = 0, N = Globals.size(); i < N; ++i) {
+ // Create wrapper for compile unit.
+ CompileUnitWrapper CUI(Globals[i]);
+ // Add to result.
+ if (CUI.isCorrectDebugVersion()) CompileUnits.insert(CUI);
+ }
+
+ // If there any bad compile units then suppress debug information
+ if (CompileUnits.size() != Globals.size()) CompileUnits.reset();
+}
+
+/// getGlobalVariables - Return a vector of debug global variables.
+///
+std::vector<GlobalWrapper> MachineDebugInfo::getGlobalVariables(Module &M) {
+ // Get vector of all debug global objects.
+ std::vector<GlobalVariable*> Globals =
+ getGlobalVariablesUsing(M, "llvm.dbg.globals");
+
+ // Accumulation of global variables.
+ std::vector<GlobalWrapper> GlobalVariables;
+
+// FIXME - skip until globals have new format
+#if 0
+ // Scan all globals.
+ for (unsigned i = 0, N = Globals.size(); i < N; ++i) {
+ // Create wrapper for global.
+ GlobalWrapper GW(Globals[i]);
+ // If the global is a variable then add to result.
+ if (GW.getTag() == DW_TAG_variable) GlobalVariables.push_back(GW);
+ }
+#endif
+
+ return GlobalVariables;
+}
+
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