forked from OSchip/llvm-project
Global variables don't have a corresponding llvm.dbg.declare, yet it is possible
to obtain debug info about them. Introduce helpers to access debug info for global variables. Also introduce a helper that works for both local and global variables. llvm-svn: 66541
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Torok Edwin
parent
afb355f281
commit
51b4a28878
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@ -507,6 +507,12 @@ namespace llvm {
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/// Finds the dbg.declare intrinsic corresponding to this value if any.
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/// It looks through pointer casts too.
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const DbgDeclareInst *findDbgDeclare(const Value *V, bool stripCasts = true);
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/// Find the debug info descriptor corresponding to this global variable.
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Value *findDbgGlobalDeclare(GlobalVariable *V);
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bool getLocationInfo(const Value *V, std::string &DisplayName, std::string &Type,
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unsigned &LineNo, std::string &File, std::string &Dir);
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} // end namespace llvm
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#endif
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@ -19,6 +19,7 @@
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#include "llvm/Module.h"
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#include "llvm/Value.h"
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#include "llvm/IntrinsicInst.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/Analysis/DebugInfo.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/Analysis/ValueTracking.h"
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@ -57,12 +58,17 @@ FunctionPass *llvm::createDbgInfoPrinterPass() { return new PrintDbgInfo(); }
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void PrintDbgInfo::printVariableDeclaration(const Value *V)
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{
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if(const DbgDeclareInst* DDI = findDbgDeclare(V)) {
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DIVariable Var(cast<GlobalVariable>(DDI->getVariable()));
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std::string Res1, Res2;
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Out << "; variable " << Var.getName(Res1)
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<< " of type " << Var.getType().getName(Res2)
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<< " at line " << Var.getLineNumber() << "\n";
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std::string DisplayName, File, Directory, Type;
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unsigned LineNo;
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if (getLocationInfo(V, DisplayName, Type, LineNo, File, Directory)) {
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Out << "; ";
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WriteAsOperand(Out, V, false, 0);
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Out << " is variable " << DisplayName
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<< " of type " << Type << " declared at ";
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if (PrintDirectory) {
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Out << Directory << "/";
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}
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Out << File << ":" << LineNo << "\n";
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}
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}
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@ -140,6 +146,11 @@ bool PrintDbgInfo::runOnFunction(Function &F)
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}
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Out << *i;
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printVariableDeclaration(i);
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if (const User *U = dyn_cast<User>(i)) {
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for(unsigned i=0;i<U->getNumOperands();i++) {
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printVariableDeclaration(U->getOperand(i));
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}
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}
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}
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}
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}
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@ -841,6 +841,34 @@ namespace llvm {
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return 0;
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}
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Value *findDbgGlobalDeclare(GlobalVariable *V)
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{
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const Module *M = V->getParent();
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const Type *Ty = M->getTypeByName("llvm.dbg.global_variable.type");
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if (!Ty)
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return 0;
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Ty = PointerType::get(Ty, 0);
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Value *Val = V->stripPointerCasts();
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for (Value::use_iterator I = Val->use_begin(), E =Val->use_end();
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I != E; ++I) {
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(I)) {
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if (CE->getOpcode() == Instruction::BitCast) {
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Value *VV = CE;
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while (VV->hasOneUse()) {
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VV = *VV->use_begin();
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}
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if (VV->getType() == Ty)
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return VV;
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}
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}
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}
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if (Val->getType() == Ty)
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return Val;
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return 0;
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}
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/// Finds the dbg.declare intrinsic corresponding to this value if any.
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/// It looks through pointer casts too.
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const DbgDeclareInst *findDbgDeclare(const Value *V, bool stripCasts)
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@ -864,6 +892,36 @@ namespace llvm {
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}
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return 0;
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}
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bool getLocationInfo(const Value *V, std::string &DisplayName, std::string &Type,
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unsigned &LineNo, std::string &File, std::string &Dir)
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{
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DICompileUnit Unit;
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DIType TypeD;
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(const_cast<Value*>(V))) {
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Value *DIGV = findDbgGlobalDeclare(GV);
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if (!DIGV)
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return false;
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DIGlobalVariable Var(cast<GlobalVariable>(DIGV));
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Var.getDisplayName(DisplayName);
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LineNo = Var.getLineNumber();
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Unit = Var.getCompileUnit();
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TypeD = Var.getType();
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} else {
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const DbgDeclareInst *DDI = findDbgDeclare(V);
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if (!DDI)
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return false;
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DIVariable Var(cast<GlobalVariable>(DDI->getVariable()));
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Var.getName(DisplayName);
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LineNo = Var.getLineNumber();
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Unit = Var.getCompileUnit();
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TypeD = Var.getType();
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}
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TypeD.getName(Type);
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Unit.getFilename(File);
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Unit.getDirectory(Dir);
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return true;
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}
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}
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/// dump - print compile unit.
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@ -1,6 +1,6 @@
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; RUN: llvm-as < %s | opt -print-dbginfo -disable-output > %t1
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; RUN: %prcontext {function name: Bar::bar return type: int at line 12} 1 < %t1 | grep {(tst.cpp:14)}
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; RUN: %prcontext {%%tmp1} 1 < %t1 | grep -E {variable tmp.+at line 23}
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; RUN: %prcontext {%%tmp1} 1 < %t1 | grep -E {variable tmp.+at tst.cpp:23}
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; RUN: %prcontext {; tst.cpp:24} 2 < %t1 | grep {%%6}
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%llvm.dbg.anchor.type = type { i32, i32 }
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%llvm.dbg.basictype.type = type { i32, { }*, i8*, { }*, i32, i64, i64, i64, i32, i32 }
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@ -0,0 +1,74 @@
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; RUN: llvm-as < %s | opt -print-dbginfo -disable-output > %t1
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; RUN: grep {%b is variable b of type x declared at x.c:7} %t1
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; RUN: grep {%2 is variable b of type x declared at x.c:7} %t1
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; RUN: grep {@c.1442 is variable c of type int declared at x.c:4} %t1
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type { } ; type %0
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%llvm.dbg.anchor.type = type { i32, i32 }
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%llvm.dbg.basictype.type = type { i32, %0*, i8*, %0*, i32, i64, i64, i64, i32, i32 }
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%llvm.dbg.compile_unit.type = type { i32, %0*, i32, i8*, i8*, i8*, i1, i1, i8*, i32 }
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%llvm.dbg.composite.type = type { i32, %0*, i8*, %0*, i32, i64, i64, i64, i32, %0*, %0*, i32 }
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%llvm.dbg.derivedtype.type = type { i32, %0*, i8*, %0*, i32, i64, i64, i64, i32, %0* }
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%llvm.dbg.global_variable.type = type { i32, %0*, %0*, i8*, i8*, i8*, %0*, i32, %0*, i1, i1, %0* }
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%llvm.dbg.subprogram.type = type { i32, %0*, %0*, i8*, i8*, i8*, %0*, i32, %0*, i1, i1 }
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%llvm.dbg.subrange.type = type { i32, i64, i64 }
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%llvm.dbg.variable.type = type { i32, %0*, i8*, %0*, i32, %0* }
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%struct..0x = type { i32 }
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@llvm.dbg.compile_units = linkonce constant %llvm.dbg.anchor.type { i32 458752, i32 17 }, section "llvm.metadata" ; <%llvm.dbg.anchor.type*> [#uses=1]
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@.str = internal constant [4 x i8] c"x.c\00", section "llvm.metadata" ; <[4 x i8]*> [#uses=1]
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@.str1 = internal constant [27 x i8] c"/home/edwin/llvm-svn/llvm/\00", section "llvm.metadata" ; <[27 x i8]*> [#uses=1]
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@.str2 = internal constant [52 x i8] c"4.2.1 (Based on Apple Inc. build 5641) (LLVM build)\00", section "llvm.metadata" ; <[52 x i8]*> [#uses=1]
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@llvm.dbg.compile_unit = internal constant %llvm.dbg.compile_unit.type { i32 458769, %0* bitcast (%llvm.dbg.anchor.type* @llvm.dbg.compile_units to %0*), i32 1, i8* getelementptr ([4 x i8]* @.str, i32 0, i32 0), i8* getelementptr ([27 x i8]* @.str1, i32 0, i32 0), i8* getelementptr ([52 x i8]* @.str2, i32 0, i32 0), i1 true, i1 false, i8* null, i32 0 }, section "llvm.metadata" ; <%llvm.dbg.compile_unit.type*> [#uses=1]
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@.str3 = internal constant [4 x i8] c"int\00", section "llvm.metadata" ; <[4 x i8]*> [#uses=1]
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@llvm.dbg.basictype = internal constant %llvm.dbg.basictype.type { i32 458788, %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*), i8* getelementptr ([4 x i8]* @.str3, i32 0, i32 0), %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*), i32 0, i64 32, i64 32, i64 0, i32 0, i32 5 }, section "llvm.metadata" ; <%llvm.dbg.basictype.type*> [#uses=1]
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@llvm.dbg.array = internal constant [1 x %0*] [%0* bitcast (%llvm.dbg.basictype.type* @llvm.dbg.basictype to %0*)], section "llvm.metadata" ; <[1 x %0*]*> [#uses=1]
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@llvm.dbg.composite = internal constant %llvm.dbg.composite.type { i32 458773, %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*), i8* null, %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*), i32 0, i64 0, i64 0, i64 0, i32 0, %0* null, %0* bitcast ([1 x %0*]* @llvm.dbg.array to %0*), i32 0 }, section "llvm.metadata" ; <%llvm.dbg.composite.type*> [#uses=1]
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@llvm.dbg.subprograms = linkonce constant %llvm.dbg.anchor.type { i32 458752, i32 46 }, section "llvm.metadata" ; <%llvm.dbg.anchor.type*> [#uses=1]
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@.str4 = internal constant [5 x i8] c"main\00", section "llvm.metadata" ; <[5 x i8]*> [#uses=1]
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@llvm.dbg.subprogram = internal constant %llvm.dbg.subprogram.type { i32 458798, %0* bitcast (%llvm.dbg.anchor.type* @llvm.dbg.subprograms to %0*), %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*), i8* getelementptr ([5 x i8]* @.str4, i32 0, i32 0), i8* getelementptr ([5 x i8]* @.str4, i32 0, i32 0), i8* null, %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*), i32 2, %0* bitcast (%llvm.dbg.composite.type* @llvm.dbg.composite to %0*), i1 false, i1 true }, section "llvm.metadata" ; <%llvm.dbg.subprogram.type*> [#uses=1]
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@.str5 = internal constant [2 x i8] c"x\00", section "llvm.metadata" ; <[2 x i8]*> [#uses=1]
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@.str7 = internal constant [2 x i8] c"a\00", section "llvm.metadata" ; <[2 x i8]*> [#uses=1]
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@llvm.dbg.derivedtype = internal constant %llvm.dbg.derivedtype.type { i32 458765, %0* bitcast (%llvm.dbg.subprogram.type* @llvm.dbg.subprogram to %0*), i8* getelementptr ([2 x i8]* @.str7, i32 0, i32 0), %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*), i32 6, i64 32, i64 32, i64 0, i32 0, %0* bitcast (%llvm.dbg.basictype.type* @llvm.dbg.basictype to %0*) }, section "llvm.metadata" ; <%llvm.dbg.derivedtype.type*> [#uses=1]
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@llvm.dbg.array8 = internal constant [1 x %0*] [%0* bitcast (%llvm.dbg.derivedtype.type* @llvm.dbg.derivedtype to %0*)], section "llvm.metadata" ; <[1 x %0*]*> [#uses=1]
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@llvm.dbg.composite9 = internal constant %llvm.dbg.composite.type { i32 458771, %0* bitcast (%llvm.dbg.subprogram.type* @llvm.dbg.subprogram to %0*), i8* getelementptr ([2 x i8]* @.str5, i32 0, i32 0), %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*), i32 5, i64 32, i64 32, i64 0, i32 0, %0* null, %0* bitcast ([1 x %0*]* @llvm.dbg.array8 to %0*), i32 0 }, section "llvm.metadata" ; <%llvm.dbg.composite.type*> [#uses=1]
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@.str10 = internal constant [2 x i8] c"b\00", section "llvm.metadata" ; <[2 x i8]*> [#uses=1]
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@llvm.dbg.variable = internal constant %llvm.dbg.variable.type { i32 459008, %0* bitcast (%llvm.dbg.subprogram.type* @llvm.dbg.subprogram to %0*), i8* getelementptr ([2 x i8]* @.str10, i32 0, i32 0), %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*), i32 7, %0* bitcast (%llvm.dbg.composite.type* @llvm.dbg.composite9 to %0*) }, section "llvm.metadata" ; <%llvm.dbg.variable.type*> [#uses=1]
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@llvm.dbg.subrange = internal constant %llvm.dbg.subrange.type { i32 458785, i64 0, i64 3 }, section "llvm.metadata" ; <%llvm.dbg.subrange.type*> [#uses=1]
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@llvm.dbg.array11 = internal constant [1 x %0*] [%0* bitcast (%llvm.dbg.subrange.type* @llvm.dbg.subrange to %0*)], section "llvm.metadata" ; <[1 x %0*]*> [#uses=1]
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@llvm.dbg.composite12 = internal constant %llvm.dbg.composite.type { i32 458753, %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*), i8* null, %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*), i32 0, i64 128, i64 32, i64 0, i32 0, %0* bitcast (%llvm.dbg.basictype.type* @llvm.dbg.basictype to %0*), %0* bitcast ([1 x %0*]* @llvm.dbg.array11 to %0*), i32 0 }, section "llvm.metadata" ; <%llvm.dbg.composite.type*> [#uses=1]
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@llvm.dbg.variable13 = internal constant %llvm.dbg.variable.type { i32 459008, %0* bitcast (%llvm.dbg.subprogram.type* @llvm.dbg.subprogram to %0*), i8* getelementptr ([2 x i8]* @.str7, i32 0, i32 0), %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*), i32 3, %0* bitcast (%llvm.dbg.composite.type* @llvm.dbg.composite12 to %0*) }, section "llvm.metadata" ; <%llvm.dbg.variable.type*> [#uses=1]
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@c.1442 = internal global i32 5 ; <i32*> [#uses=2]
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@llvm.dbg.global_variables = linkonce constant %llvm.dbg.anchor.type { i32 458752, i32 52 }, section "llvm.metadata" ; <%llvm.dbg.anchor.type*> [#uses=1]
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@.str14 = internal constant [7 x i8] c"c.1442\00", section "llvm.metadata" ; <[7 x i8]*> [#uses=1]
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@.str15 = internal constant [2 x i8] c"c\00", section "llvm.metadata" ; <[2 x i8]*> [#uses=1]
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@llvm.dbg.global_variable = internal constant %llvm.dbg.global_variable.type { i32 458804, %0* bitcast (%llvm.dbg.anchor.type* @llvm.dbg.global_variables to %0*), %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*), i8* getelementptr ([7 x i8]* @.str14, i32 0, i32 0), i8* getelementptr ([2 x i8]* @.str15, i32 0, i32 0), i8* null, %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*), i32 4, %0* bitcast (%llvm.dbg.basictype.type* @llvm.dbg.basictype to %0*), i1 true, i1 true, %0* bitcast (i32* @c.1442 to %0*) }, section "llvm.metadata" ; <%llvm.dbg.global_variable.type*> [#uses=0]
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define i32 @main() nounwind {
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entry:
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%b = alloca %struct..0x ; <%struct..0x*> [#uses=2]
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%a = alloca [4 x i32] ; <[4 x i32]*> [#uses=1]
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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call void @llvm.dbg.func.start(%0* bitcast (%llvm.dbg.subprogram.type* @llvm.dbg.subprogram to %0*))
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%0 = bitcast %struct..0x* %b to %0* ; <%0*> [#uses=1]
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call void @llvm.dbg.declare(%0* %0, %0* bitcast (%llvm.dbg.variable.type* @llvm.dbg.variable to %0*))
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%1 = bitcast [4 x i32]* %a to %0* ; <%0*> [#uses=1]
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call void @llvm.dbg.declare(%0* %1, %0* bitcast (%llvm.dbg.variable.type* @llvm.dbg.variable13 to %0*))
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call void @llvm.dbg.stoppoint(i32 8, i32 0, %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*))
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%2 = getelementptr %struct..0x* %b, i32 0, i32 0 ; <i32*> [#uses=1]
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store i32 5, i32* %2, align 4
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call void @llvm.dbg.stoppoint(i32 9, i32 0, %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*))
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%3 = load i32* @c.1442, align 4 ; <i32> [#uses=1]
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br label %return
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return: ; preds = %entry
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call void @llvm.dbg.stoppoint(i32 9, i32 0, %0* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to %0*))
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call void @llvm.dbg.region.end(%0* bitcast (%llvm.dbg.subprogram.type* @llvm.dbg.subprogram to %0*))
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ret i32 %3
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}
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declare void @llvm.dbg.func.start(%0*) nounwind readnone
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declare void @llvm.dbg.declare(%0*, %0*) nounwind readnone
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declare void @llvm.dbg.stoppoint(i32, i32, %0*) nounwind readnone
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declare void @llvm.dbg.region.end(%0*) nounwind readnone
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