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Use .cfi_sections to put the unwind info in .debug_frame when possible. With

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this clang will use .debug_frame in, for example,
clang -g -c -m32 test.c
This matches gcc's behaviour. It looks like .debug_frame is a bit bigger
than .eh_frame, but has the big advantage of not being allocated.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131140 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2011-05-10 18:39:09 +00:00
parent 988397dcbc
commit e29887b4ee
5 changed files with 45 additions and 10 deletions
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7
include/llvm/CodeGen/AsmPrinter.h
View File

@ -185,7 +185,12 @@ namespace llvm {
void emitPrologLabel(const MachineInstr &MI);
bool needsCFIMoves();
enum CFIMoveType {
CFI_M_None,
CFI_M_EH,
CFI_M_Debug
};
CFIMoveType needsCFIMoves();
/// EmitConstantPool - Print to the current output stream assembly
/// representations of the constants in the constant pool MCP. This is

16
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View File

@ -592,17 +592,17 @@ static bool EmitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
return true;
}
bool AsmPrinter::needsCFIMoves() {
AsmPrinter::CFIMoveType AsmPrinter::needsCFIMoves() {
if (UnwindTablesMandatory)
return true;
return CFI_M_EH;
if (!MF->getFunction()->doesNotThrow())
return CFI_M_EH;
if (MMI->hasDebugInfo())
return true;
return CFI_M_Debug;
if (MF->getFunction()->doesNotThrow())
return false;
return true;
return CFI_M_None;
}
void AsmPrinter::emitPrologLabel(const MachineInstr &MI) {
@ -611,7 +611,7 @@ void AsmPrinter::emitPrologLabel(const MachineInstr &MI) {
if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
return;
if (!needsCFIMoves())
if (needsCFIMoves() == CFI_M_None)
return;
MachineModuleInfo &MMI = MF->getMMI();

11
lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
View File

@ -49,6 +49,9 @@ DwarfCFIException::~DwarfCFIException() {}
/// EndModule - Emit all exception information that should come after the
/// content.
void DwarfCFIException::EndModule() {
if (moveTypeModule == AsmPrinter::CFI_M_Debug)
Asm->OutStreamer.EmitCFISections(false, true);
if (!Asm->MAI->isExceptionHandlingDwarf())
return;
@ -87,7 +90,13 @@ void DwarfCFIException::BeginFunction(const MachineFunction *MF) {
bool hasLandingPads = !MMI->getLandingPads().empty();
// See if we need frame move info.
shouldEmitMoves = Asm->needsCFIMoves();
AsmPrinter::CFIMoveType MoveType = Asm->needsCFIMoves();
if (MoveType == AsmPrinter::CFI_M_EH ||
(MoveType == AsmPrinter::CFI_M_Debug &&
moveTypeModule == AsmPrinter::CFI_M_None))
moveTypeModule = MoveType;
shouldEmitMoves = MoveType != AsmPrinter::CFI_M_None;
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
unsigned PerEncoding = TLOF.getPersonalityEncoding();

3
lib/CodeGen/AsmPrinter/DwarfException.h
View File

@ -15,6 +15,7 @@
#define LLVM_CODEGEN_ASMPRINTER_DWARFEXCEPTION_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include <vector>
namespace llvm {
@ -152,6 +153,8 @@ class DwarfCFIException : public DwarfException {
/// should be emitted.
bool shouldEmitMoves;
AsmPrinter::CFIMoveType moveTypeModule;
public:
//===--------------------------------------------------------------------===//
// Main entry points.

18
test/DebugInfo/debug_frame.ll Normal file
View File

@ -0,0 +1,18 @@
; RUN: llc %s -o - | FileCheck %s
; Test that we produce a .debug_frame, not an .eh_frame
; CHECK: .cfi_sections .debug_frame
define void @f() nounwind {
entry:
ret void
}
!llvm.dbg.sp = !{!0}
!0 = metadata !{i32 589870, i32 0, metadata !1, metadata !"f", metadata !"f", metadata !"", metadata !1, i32 1, metadata !3, i1 false, i1 true, i32 0, i32 0, i32 0, i32 256, i1 true, void ()* @f, null, null} ; [ DW_TAG_subprogram ]
!1 = metadata !{i32 589865, metadata !"/home/espindola/llvm/test.c", metadata !"/home/espindola/llvm/build", metadata !2} ; [ DW_TAG_file_type ]
!2 = metadata !{i32 589841, i32 0, i32 12, metadata !"/home/espindola/llvm/test.c", metadata !"/home/espindola/llvm/build", metadata !"clang version 3.0 ()", i1 true, i1 true, metadata !"", i32 0} ; [ DW_TAG_compile_unit ]
!3 = metadata !{i32 589845, metadata !1, metadata !"", metadata !1, i32 0, i64 0, i64 0, i32 0, i32 0, i32 0, metadata !4, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
!4 = metadata !{null}