This revision was automatically updated to reflect the committed changes.
Closed by commit rGf0120556c7e2: [DWARF] Emit DW_AT_call_return_pc as an
address (authored by vsk).
Herald added a project: LLDB.
Changed prior to commit:
https://reviews.llvm.org/D72489?vs=237419&id=238350#toc
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D72489/new/
https://reviews.llvm.org/D72489
Files:
lldb/include/lldb/Symbol/Function.h
lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/Makefile
lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/One.mk
lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/One/One.c
lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/TestCrossDSOTailCalls.py
lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/Two.mk
lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/Two/Two.c
lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/main.c
lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/shared.h
lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/Makefile
lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/One.c
lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/TestCrossObjectTailCalls.py
lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/Two.c
lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/main.c
lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/shared.h
lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h
lldb/source/Symbol/Function.cpp
llvm/include/llvm/CodeGen/DebugHandlerBase.h
llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
llvm/test/DebugInfo/X86/debug_addr.ll
llvm/test/tools/dsymutil/Inputs/call-site-entry.c
llvm/test/tools/dsymutil/Inputs/call-site-entry.macho.x86_64
llvm/test/tools/dsymutil/Inputs/call-site-entry.macho.x86_64.o
llvm/test/tools/dsymutil/call-site-entry-linking.test
llvm/tools/dsymutil/DwarfLinkerForBinary.cpp
Index: llvm/tools/dsymutil/DwarfLinkerForBinary.cpp
===================================================================
--- llvm/tools/dsymutil/DwarfLinkerForBinary.cpp
+++ llvm/tools/dsymutil/DwarfLinkerForBinary.cpp
@@ -1363,6 +1363,10 @@
// it. Otherwise (when no relocations where applied) just use the
// one we just decoded.
Addr = (Info.OrigHighPc ? Info.OrigHighPc : Addr) + Info.PCOffset;
+ } else if (AttrSpec.Attr == dwarf::DW_AT_call_return_pc) {
+ // Relocate a return PC address within a call site entry.
+ if (Die.getTag() == dwarf::DW_TAG_call_site)
+ Addr += Info.PCOffset;
}
Die.addValue(DIEAlloc, static_cast<dwarf::Attribute>(AttrSpec.Attr),
Index: llvm/test/tools/dsymutil/call-site-entry-linking.test
===================================================================
--- /dev/null
+++ llvm/test/tools/dsymutil/call-site-entry-linking.test
@@ -0,0 +1,4 @@
+RUN: dsymutil -oso-prepend-path=%p %p/Inputs/call-site-entry.macho.x86_64 -o %t.dSYM
+RUN: llvm-dwarfdump %t.dSYM | FileCheck %s -implicit-check-not=DW_AT_call_return_pc
+
+CHECK: DW_AT_call_return_pc (0x0000000100000fa4)
Index: llvm/test/tools/dsymutil/Inputs/call-site-entry.c
===================================================================
--- /dev/null
+++ llvm/test/tools/dsymutil/Inputs/call-site-entry.c
@@ -0,0 +1,25 @@
+/*
+ * This file is used to test dsymutil support for call site entries
+ * (DW_TAG_call_site / DW_AT_call_return_pc).
+ *
+ * Instructions for regenerating binaries (on Darwin/x86_64):
+ *
+ * 1. Copy the source to a top-level directory to work around having absolute
+ * paths in the symtab's OSO entries.
+ *
+ * mkdir -p /Inputs/ && cp call-site-entry.c /Inputs && cd /Inputs
+ *
+ * 2. Compile with call site info enabled.
+ *
+ * clang -g -O1 -Xclang -disable-llvm-passes call-site-entry.c -c -o call-site-entry.macho.x86_64.o
+ * clang call-site-entry.macho.x86_64.o -o call-site-entry.macho.x86_64
+ *
+ * 3. Copy the binaries back into the repo's Inputs directory. You'll need
+ * -oso-prepend-path=%p to link.
+ */
+
+__attribute__((optnone)) int f() {}
+
+int main() {
+ f();
+}
Index: llvm/test/DebugInfo/X86/debug_addr.ll
===================================================================
--- llvm/test/DebugInfo/X86/debug_addr.ll
+++ llvm/test/DebugInfo/X86/debug_addr.ll
@@ -9,6 +9,7 @@
; }
;
; void bar() {
+; foo();
; }
; DWARF4: .debug_info contents:
@@ -18,11 +19,14 @@
; DWARF4-NOT: DW_TAG_{{.*}}
; DWARF4: DW_AT_GNU_dwo_name{{.*}}test.dwo
; DWARF4: DW_AT_GNU_addr_base{{.*}}0x00000000
+; DWARF4: DW_TAG_GNU_call_site
+; DWARF4: DW_AT_low_pc [DW_FORM_GNU_addr_index] (indexed (00000002) address = 0x0000000000000018 ".text")
; DWARF4: .debug_addr contents:
; DWARF4-NEXT: 0x00000000: Addr Section: length = 0x00000000, version = 0x0004, addr_size = 0x04, seg_size = 0x00
; DWARF4-NEXT: Addrs: [
; DWARF4-NEXT: 0x00000000
; DWARF4-NEXT: 0x00000010
+; DWARF4-NEXT: 0x00000018
; DWARF4-NEXT: ]
; DWARF5: .debug_info contents:
@@ -33,11 +37,13 @@
; DWARF5: DW_AT_dwo_name{{.*}}test.dwo
; DWARF5: DW_AT_addr_base{{.*}}0x00000008
; DWARF5: DW_AT_low_pc [DW_FORM_addrx] (indexed (00000000) address = 0x0000000000000000 ".text")
+; DWARF5: DW_AT_call_return_pc [DW_FORM_addrx] (indexed (00000002) address = 0x0000000000000018 ".text")
; DWARF5: .debug_addr contents:
-; DWARF5-NEXT: 0x00000000: Addr Section: length = 0x0000000c, version = 0x0005, addr_size = 0x04, seg_size = 0x00
+; DWARF5-NEXT: 0x00000000: Addr Section: length = 0x00000010, version = 0x0005, addr_size = 0x04, seg_size = 0x00
; DWARF5-NEXT: Addrs: [
; DWARF5-NEXT: 0x00000000
; DWARF5-NEXT: 0x00000010
+; DWARF5-NEXT: 0x00000018
; DWARF5-NEXT: ]
; ModuleID = './test.c'
@@ -54,6 +60,7 @@
; Function Attrs: noinline nounwind optnone
define void @bar() #0 !dbg !13 {
entry:
+ call void @foo(), !dbg !14
ret void, !dbg !14
}
@@ -76,5 +83,5 @@
!10 = !DISubroutineType(types: !11)
!11 = !{null}
!12 = !DILocation(line: 2, column: 3, scope: !8)
-!13 = distinct !DISubprogram(name: "bar", scope: !9, file: !9, line: 5, type: !10, isLocal: false, isDefinition: true, scopeLine: 5, isOptimized: false, unit: !0)
+!13 = distinct !DISubprogram(name: "bar", scope: !9, file: !9, line: 5, type: !10, isLocal: false, isDefinition: true, flags: DIFlagAllCallsDescribed, scopeLine: 5, isOptimized: false, unit: !0)
!14 = !DILocation(line: 6, column: 3, scope: !13)
Index: llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
===================================================================
--- llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -719,7 +719,6 @@
const TargetInstrInfo *TII = MF.getSubtarget().getInstrInfo();
assert(TII && "TargetInstrInfo not found: cannot label tail calls");
- bool ApplyGNUExtensions = getDwarfVersion() == 4 && tuneForGDB();
// Emit call site entries for each call or tail call in the function.
for (const MachineBasicBlock &MBB : MF) {
@@ -781,25 +780,16 @@
const MachineInstr *TopLevelCallMI =
MI.isInsideBundle() ? &*getBundleStart(MI.getIterator()) : &MI;
- // For tail calls, for non-gdb tuning, no return PC information is needed.
+ // For tail calls, no return PC information is needed.
// For regular calls (and tail calls in GDB tuning), the return PC
// is needed to disambiguate paths in the call graph which could lead to
// some target function.
- const MCExpr *PCOffset =
+ const MCSymbol *PCAddr =
(IsTail && !tuneForGDB())
? nullptr
- : getFunctionLocalOffsetAfterInsn(TopLevelCallMI);
-
- // Return address of a call-like instruction for a normal call or a
- // jump-like instruction for a tail call. This is needed for
- // GDB + DWARF 4 tuning.
- const MCSymbol *PCAddr =
- ApplyGNUExtensions
- ? const_cast<MCSymbol *>(getLabelAfterInsn(TopLevelCallMI))
- : nullptr;
+ : const_cast<MCSymbol *>(getLabelAfterInsn(TopLevelCallMI));
- assert((IsTail || PCOffset || PCAddr) &&
- "Call without return PC information");
+ assert((IsTail || PCAddr) && "Call without return PC information");
LLVM_DEBUG(dbgs() << "CallSiteEntry: " << MF.getName() << " -> "
<< (CalleeDecl ? CalleeDecl->getName()
@@ -808,9 +798,8 @@
->getName(CallReg)))
<< (IsTail ? " [IsTail]" : "") << "\n");
- DIE &CallSiteDIE =
- CU.constructCallSiteEntryDIE(ScopeDIE, CalleeSP, IsTail, PCAddr,
- PCOffset, CallReg);
+ DIE &CallSiteDIE = CU.constructCallSiteEntryDIE(ScopeDIE, CalleeSP,
+ IsTail, PCAddr, CallReg);
// GDB and LLDB support call site parameter debug info.
if (Asm->TM.Options.EnableDebugEntryValues &&
Index: llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
===================================================================
--- llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
+++ llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
@@ -242,17 +242,12 @@
/// Construct a call site entry DIE describing a call within \p Scope to a
/// callee described by \p CalleeSP.
/// \p IsTail specifies whether the call is a tail call.
- /// \p PCAddr (used for GDB + DWARF 4 tuning) points to the PC value after
- /// the call instruction.
- /// \p PCOffset (used for cases other than GDB + DWARF 4 tuning) must be
- /// non-zero for non-tail calls (in the case of non-gdb tuning, since for
- /// GDB + DWARF 5 tuning we still generate PC info for tail calls) or be the
- /// function-local offset to PC value after the call instruction.
+ /// \p PCAddr points to the PC value after the call instruction.
/// \p CallReg is a register location for an indirect call. For direct calls
/// the \p CallReg is set to 0.
DIE &constructCallSiteEntryDIE(DIE &ScopeDIE, const DISubprogram *CalleeSP,
bool IsTail, const MCSymbol *PCAddr,
- const MCExpr *PCOffset, unsigned CallReg);
+ unsigned CallReg);
/// Construct call site parameter DIEs for the \p CallSiteDIE. The \p Params
/// were collected by the \ref collectCallSiteParameters.
/// Note: The order of parameters does not matter, since debuggers recognize
@@ -340,9 +335,6 @@
/// Add a Dwarf expression attribute data and value.
void addExpr(DIELoc &Die, dwarf::Form Form, const MCExpr *Expr);
- /// Add an attribute containing an address expression to \p Die.
- void addAddressExpr(DIE &Die, dwarf::Attribute Attribute, const MCExpr *Expr);
-
void applySubprogramAttributesToDefinition(const DISubprogram *SP,
DIE &SPDie);
Index: llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
===================================================================
--- llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -956,9 +956,11 @@
}
}
-DIE &DwarfCompileUnit::constructCallSiteEntryDIE(
- DIE &ScopeDIE, const DISubprogram *CalleeSP, bool IsTail,
- const MCSymbol *PCAddr, const MCExpr *PCOffset, unsigned CallReg) {
+DIE &DwarfCompileUnit::constructCallSiteEntryDIE(DIE &ScopeDIE,
+ const DISubprogram *CalleeSP,
+ bool IsTail,
+ const MCSymbol *PCAddr,
+ unsigned CallReg) {
// Insert a call site entry DIE within ScopeDIE.
DIE &CallSiteDIE = createAndAddDIE(getDwarf5OrGNUTag(dwarf::DW_TAG_call_site),
ScopeDIE, nullptr);
@@ -984,8 +986,8 @@
assert(PCAddr && "Missing PC information for a call");
addLabelAddress(CallSiteDIE, dwarf::DW_AT_low_pc, PCAddr);
} else if (!IsTail || DD->tuneForGDB()) {
- assert(PCOffset && "Missing return PC information for a call");
- addAddressExpr(CallSiteDIE, dwarf::DW_AT_call_return_pc, PCOffset);
+ assert(PCAddr && "Missing return PC information for a call");
+ addLabelAddress(CallSiteDIE, dwarf::DW_AT_call_return_pc, PCAddr);
}
return CallSiteDIE;
@@ -1285,12 +1287,6 @@
Die.addValue(DIEValueAllocator, (dwarf::Attribute)0, Form, DIEExpr(Expr));
}
-void DwarfCompileUnit::addAddressExpr(DIE &Die, dwarf::Attribute Attribute,
- const MCExpr *Expr) {
- Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_addr,
- DIEExpr(Expr));
-}
-
void DwarfCompileUnit::applySubprogramAttributesToDefinition(
const DISubprogram *SP, DIE &SPDie) {
auto *SPDecl = SP->getDeclaration();
Index: llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
===================================================================
--- llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
+++ llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
@@ -124,21 +124,6 @@
return LabelsAfterInsn.lookup(MI);
}
-// Return the function-local offset of an instruction.
-const MCExpr *
-DebugHandlerBase::getFunctionLocalOffsetAfterInsn(const MachineInstr *MI) {
- MCContext &MC = Asm->OutContext;
-
- MCSymbol *Start = Asm->getFunctionBegin();
- const auto *StartRef = MCSymbolRefExpr::create(Start, MC);
-
- MCSymbol *AfterInsn = getLabelAfterInsn(MI);
- assert(AfterInsn && "Expected label after instruction");
- const auto *AfterRef = MCSymbolRefExpr::create(AfterInsn, MC);
-
- return MCBinaryExpr::createSub(AfterRef, StartRef, MC);
-}
-
/// If this type is derived from a base type then return base type size.
uint64_t DebugHandlerBase::getBaseTypeSize(const DIType *Ty) {
assert(Ty);
Index: llvm/include/llvm/CodeGen/DebugHandlerBase.h
===================================================================
--- llvm/include/llvm/CodeGen/DebugHandlerBase.h
+++ llvm/include/llvm/CodeGen/DebugHandlerBase.h
@@ -124,10 +124,6 @@
/// Return Label immediately following the instruction.
MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
- /// Return the function-local offset of an instruction. A label for the
- /// instruction \p MI should exist (\ref getLabelAfterInsn).
- const MCExpr *getFunctionLocalOffsetAfterInsn(const MachineInstr *MI);
-
/// If this type is derived from a base type then return base type size.
static uint64_t getBaseTypeSize(const DIType *Ty);
};
Index: lldb/source/Symbol/Function.cpp
===================================================================
--- lldb/source/Symbol/Function.cpp
+++ lldb/source/Symbol/Function.cpp
@@ -123,8 +123,25 @@
lldb::addr_t CallEdge::GetReturnPCAddress(Function &caller,
Target &target) const {
- const Address &base = caller.GetAddressRange().GetBaseAddress();
- return base.GetLoadAddress(&target) + return_pc;
+ Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
+
+ const Address &caller_start_addr = caller.GetAddressRange().GetBaseAddress();
+
+ ModuleSP caller_module_sp = caller_start_addr.GetModule();
+ if (!caller_module_sp) {
+ LLDB_LOG(log, "GetReturnPCAddress: cannot get Module for caller");
+ return LLDB_INVALID_ADDRESS;
+ }
+
+ SectionList *section_list = caller_module_sp->GetSectionList();
+ if (!section_list) {
+ LLDB_LOG(log, "GetReturnPCAddress: cannot get SectionList for Module");
+ return LLDB_INVALID_ADDRESS;
+ }
+
+ Address return_pc_addr = Address(return_pc, section_list);
+ lldb::addr_t ret_addr = return_pc_addr.GetLoadAddress(&target);
+ return ret_addr;
}
void DirectCallEdge::ParseSymbolFileAndResolve(ModuleList &images) {
Index: lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h
===================================================================
--- lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h
+++ lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h
@@ -417,6 +417,18 @@
bool ClassContainsSelector(const DWARFDIE &class_die,
lldb_private::ConstString selector);
+ /// Parse call site entries (DW_TAG_call_site), including any nested call site
+ /// parameters (DW_TAG_call_site_parameter).
+ std::vector<std::unique_ptr<lldb_private::CallEdge>>
+ CollectCallEdges(lldb::ModuleSP module, DWARFDIE function_die);
+
+ /// If this symbol file is linked to by a debug map (see
+ /// SymbolFileDWARFDebugMap), and \p file_addr is a file address relative to
+ /// an object file, adjust \p file_addr so that it is relative to the main
+ /// binary. Returns the adjusted address, or \p file_addr if no adjustment is
+ /// needed, on success and LLDB_INVALID_ADDRESS otherwise.
+ lldb::addr_t FixupAddress(lldb::addr_t file_addr);
+
bool FixupAddress(lldb_private::Address &addr);
typedef std::set<lldb_private::Type *> TypeSet;
Index: lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
===================================================================
--- lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
+++ lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
@@ -792,6 +792,13 @@
return dwarf_ast->ParseFunctionFromDWARF(comp_unit, die);
}
+lldb::addr_t SymbolFileDWARF::FixupAddress(lldb::addr_t file_addr) {
+ SymbolFileDWARFDebugMap *debug_map_symfile = GetDebugMapSymfile();
+ if (debug_map_symfile)
+ return debug_map_symfile->LinkOSOFileAddress(this, file_addr);
+ return file_addr;
+}
+
bool SymbolFileDWARF::FixupAddress(Address &addr) {
SymbolFileDWARFDebugMap *debug_map_symfile = GetDebugMapSymfile();
if (debug_map_symfile) {
@@ -3805,8 +3812,8 @@
}
/// Collect call graph edges present in a function DIE.
-static std::vector<std::unique_ptr<lldb_private::CallEdge>>
-CollectCallEdges(ModuleSP module, DWARFDIE function_die) {
+std::vector<std::unique_ptr<lldb_private::CallEdge>>
+SymbolFileDWARF::CollectCallEdges(ModuleSP module, DWARFDIE function_die) {
// Check if the function has a supported call site-related attribute.
// TODO: In the future it may be worthwhile to support call_all_source_calls.
uint64_t has_call_edges =
@@ -3882,6 +3889,11 @@
continue;
}
+ // Adjust the return PC. It needs to be fixed up if the main executable
+ // contains a debug map (i.e. pointers to object files), because we need a
+ // file address relative to the executable's text section.
+ return_pc = FixupAddress(return_pc);
+
// Extract call site parameters.
CallSiteParameterArray parameters =
CollectCallSiteParameters(module, child);
Index: lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/shared.h
===================================================================
--- /dev/null
+++ lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/shared.h
@@ -0,0 +1,3 @@
+void tail_called_in_a_from_main();
+
+void tail_called_in_b_from_a();
Index: lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/main.c
===================================================================
--- /dev/null
+++ lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/main.c
@@ -0,0 +1,12 @@
+#include "shared.h"
+
+__attribute__((noinline))
+static void helper() {
+ tail_called_in_a_from_main();
+}
+
+__attribute__((disable_tail_calls))
+int main() {
+ helper();
+ return 0;
+}
Index: lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/Two.c
===================================================================
--- /dev/null
+++ lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/Two.c
@@ -0,0 +1,12 @@
+#include "shared.h"
+
+volatile int x;
+
+__attribute__((noinline))
+void tail_called_in_b_from_b() {
+ ++x; // break here
+}
+
+void tail_called_in_b_from_a() {
+ tail_called_in_b_from_b();
+}
Index: lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/TestCrossObjectTailCalls.py
===================================================================
--- /dev/null
+++ lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/TestCrossObjectTailCalls.py
@@ -0,0 +1,59 @@
+"""Test that backtraces can follow cross-object tail calls"""
+
+
+
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+
+class TestCrossObjectTailCalls(TestBase):
+
+ mydir = TestBase.compute_mydir(__file__)
+
+ def setUp(self):
+ TestBase.setUp(self)
+
+ @skipIf(compiler="clang", compiler_version=['<', '8.0'])
+ @skipIf(dwarf_version=['<', '4'])
+ @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr26265")
+ def test_cross_object_tail_calls(self):
+ self.build()
+ exe = self.getBuildArtifact("a.out")
+ target = self.dbg.CreateTarget(exe)
+ self.assertTrue(target, VALID_TARGET)
+
+ lldbutil.run_break_set_by_source_regexp(self, '// break here',
+ extra_options='-f Two.c')
+
+ process = target.LaunchSimple(
+ None, None, self.get_process_working_directory())
+ self.assertTrue(process, PROCESS_IS_VALID)
+
+ # We should be stopped in the second dylib.
+ thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
+
+ # Debug helper:
+ # self.runCmd("log enable -f /tmp/lldb.log lldb step")
+ # self.runCmd("bt")
+
+ # Check that the backtrace is what we expect:
+ # frame #0: 0x000000010be73f94 a.out`tail_called_in_b_from_b at Two.c:7:3 [opt]
+ # frame #1: 0x000000010be73fa0 a.out`tail_called_in_b_from_a at Two.c:8:1 [opt] [artificial]
+ # frame #2: 0x000000010be73f80 a.out`helper_in_a at One.c:11:1 [opt] [artificial]
+ # frame #3: 0x000000010be73f79 a.out`tail_called_in_a_from_main at One.c:10:3 [opt]
+ # frame #4: 0x000000010be73f60 a.out`helper at main.c:11:3 [opt] [artificial]
+ # frame #5: 0x000000010be73f59 a.out`main at main.c:10:3 [opt]
+ expected_frames = [
+ ("tail_called_in_b_from_b", False),
+ ("tail_called_in_b_from_a", True),
+ ("helper_in_a", True),
+ ("tail_called_in_a_from_main", False),
+ ("helper", True),
+ ("main", False)
+ ]
+ for idx, (name, is_artificial) in enumerate(expected_frames):
+ frame = thread.GetFrameAtIndex(idx)
+ self.assertTrue(name in frame.GetDisplayFunctionName())
+ self.assertEqual(frame.IsArtificial(), is_artificial)
Index: lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/One.c
===================================================================
--- /dev/null
+++ lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/One.c
@@ -0,0 +1,11 @@
+#include "shared.h"
+
+__attribute__((noinline))
+static void helper_in_a() {
+ tail_called_in_b_from_a();
+}
+
+__attribute__((disable_tail_calls))
+void tail_called_in_a_from_main() {
+ helper_in_a();
+}
Index: lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/Makefile
===================================================================
--- /dev/null
+++ lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/Makefile
@@ -0,0 +1,4 @@
+C_SOURCES := main.c One.c Two.c
+
+CFLAGS_EXTRAS := -g -O2 -glldb
+include Makefile.rules
Index: lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/shared.h
===================================================================
--- /dev/null
+++ lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/shared.h
@@ -0,0 +1,3 @@
+void tail_called_in_a_from_main();
+
+void tail_called_in_b_from_a();
Index: lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/main.c
===================================================================
--- /dev/null
+++ lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/main.c
@@ -0,0 +1,12 @@
+#include "shared.h"
+
+__attribute__((noinline))
+static void helper() {
+ tail_called_in_a_from_main();
+}
+
+__attribute__((disable_tail_calls))
+int main() {
+ helper();
+ return 0;
+}
Index: lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/Two/Two.c
===================================================================
--- /dev/null
+++ lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/Two/Two.c
@@ -0,0 +1,12 @@
+#include "shared.h"
+
+volatile int x;
+
+__attribute__((noinline))
+void tail_called_in_b_from_b() {
+ ++x; // break here
+}
+
+void tail_called_in_b_from_a() {
+ tail_called_in_b_from_b();
+}
Index: lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/Two.mk
===================================================================
--- /dev/null
+++ lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/Two.mk
@@ -0,0 +1,6 @@
+DYLIB_NAME := Two
+DYLIB_C_SOURCES := Two.c
+DYLIB_ONLY := YES
+CFLAGS_EXTRAS := -g -O2 -glldb
+
+include Makefile.rules
Index: lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/TestCrossDSOTailCalls.py
===================================================================
--- /dev/null
+++ lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/TestCrossDSOTailCalls.py
@@ -0,0 +1,64 @@
+"""Test that backtraces can follow cross-DSO tail calls"""
+
+
+
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+
+class TestCrossDSOTailCalls(TestBase):
+
+ mydir = TestBase.compute_mydir(__file__)
+
+ def setUp(self):
+ TestBase.setUp(self)
+
+ @skipIf(compiler="clang", compiler_version=['<', '8.0'])
+ @skipIf(dwarf_version=['<', '4'])
+ @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr26265")
+ def test_cross_dso_tail_calls(self):
+ self.build()
+ exe = self.getBuildArtifact("a.out")
+ target = self.dbg.CreateTarget(exe)
+ self.assertTrue(target, VALID_TARGET)
+
+ # Register our shared libraries for remote targets so they get
+ # automatically uploaded
+ environment = self.registerSharedLibrariesWithTarget(
+ target, ['One', 'Two'])
+
+ lldbutil.run_break_set_by_source_regexp(self, '// break here',
+ extra_options='-f Two.c')
+
+ process = target.LaunchSimple(
+ None, environment, self.get_process_working_directory())
+ self.assertTrue(process, PROCESS_IS_VALID)
+
+ # We should be stopped in the second dylib.
+ thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
+
+ # Debug helper:
+ # self.runCmd("log enable -f /tmp/lldb.log lldb step")
+ # self.runCmd("bt")
+
+ # Check that the backtrace is what we expect:
+ # frame #0: 0x000000010d5e5f94 libTwo.dylib`tail_called_in_b_from_b at Two.c:7:3 [opt]
+ # frame #1: 0x000000010d5e5fa0 libTwo.dylib`tail_called_in_b_from_a [opt] [artificial]
+ # frame #2: 0x000000010d5dcf80 libOne.dylib`helper_in_a [opt] [artificial]
+ # frame #3: 0x000000010d5dcf79 libOne.dylib`tail_called_in_a_from_main at One.c:10:3 [opt]
+ # frame #4: 0x000000010d5d3f80 a.out`helper [opt] [artificial]
+ # frame #5: 0x000000010d5d3f79 a.out`main at main.c:10:3 [opt]
+ expected_frames = [
+ ("tail_called_in_b_from_b", False),
+ ("tail_called_in_b_from_a", True),
+ ("helper_in_a", True),
+ ("tail_called_in_a_from_main", False),
+ ("helper", True),
+ ("main", False)
+ ]
+ for idx, (name, is_artificial) in enumerate(expected_frames):
+ frame = thread.GetFrameAtIndex(idx)
+ self.assertTrue(name in frame.GetDisplayFunctionName())
+ self.assertEqual(frame.IsArtificial(), is_artificial)
Index: lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/One/One.c
===================================================================
--- /dev/null
+++ lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/One/One.c
@@ -0,0 +1,11 @@
+#include "shared.h"
+
+__attribute__((noinline))
+static void helper_in_a() {
+ tail_called_in_b_from_a();
+}
+
+__attribute__((disable_tail_calls))
+void tail_called_in_a_from_main() {
+ helper_in_a();
+}
Index: lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/One.mk
===================================================================
--- /dev/null
+++ lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/One.mk
@@ -0,0 +1,7 @@
+DYLIB_NAME := One
+DYLIB_C_SOURCES := One.c
+DYLIB_ONLY := YES
+CFLAGS_EXTRAS := -g -O2 -glldb
+LD_EXTRAS := -L. -lTwo
+
+include Makefile.rules
Index: lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/Makefile
===================================================================
--- /dev/null
+++ lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/Makefile
@@ -0,0 +1,17 @@
+LD_EXTRAS := -L. -l$(LIB_PREFIX)One -l$(LIB_PREFIX)Two
+C_SOURCES := main.c
+CFLAGS_EXTRAS := -g -O2 -glldb
+
+include Makefile.rules
+
+.PHONY:
+a.out: lib_One lib_Two
+
+lib_One: lib_Two
+
+lib_%:
+ $(MAKE) VPATH=$(SRCDIR)/$* -I $(SRCDIR) -f $(SRCDIR)/$*.mk DSYMUTIL=$(DSYMUTIL)
+
+clean::
+ $(MAKE) -f $(SRCDIR)/One.mk clean
+ $(MAKE) -f $(SRCDIR)/Two.mk clean
Index: lldb/include/lldb/Symbol/Function.h
===================================================================
--- lldb/include/lldb/Symbol/Function.h
+++ lldb/include/lldb/Symbol/Function.h
@@ -281,8 +281,7 @@
/// made the call.
lldb::addr_t GetReturnPCAddress(Function &caller, Target &target) const;
- /// Like \ref GetReturnPCAddress, but returns an unslid function-local PC
- /// offset.
+ /// Like \ref GetReturnPCAddress, but returns an unresolved file address.
lldb::addr_t GetUnresolvedReturnPCAddress() const { return return_pc; }
/// Get the call site parameters available at this call edge.
@@ -294,9 +293,8 @@
CallEdge(lldb::addr_t return_pc, CallSiteParameterArray &¶meters)
: return_pc(return_pc), parameters(std::move(parameters)) {}
- /// An invalid address if this is a tail call. Otherwise, the function-local
- /// PC offset. Adding this PC offset to the function's base load address
- /// gives the return PC for the call.
+ /// An invalid address if this is a tail call. Otherwise, the return PC for
+ /// the call. Note that this is a file address which must be resolved.
lldb::addr_t return_pc;
CallSiteParameterArray parameters;
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