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Implement cfi_restore. Patch by Brian Anderson!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147356 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2011-12-29 21:43:03 +00:00
parent c25680f728
commit ed23bdb65f
6 changed files with 80 additions and 2 deletions
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5
include/llvm/MC/MCDwarf.h
View File

@ -271,7 +271,8 @@ namespace llvm {
class MCCFIInstruction {
public:
enum OpType { SameValue, RememberState, RestoreState, Move, RelMove, Escape };
enum OpType { SameValue, RememberState, RestoreState, Move, RelMove, Escape,
Restore};
private:
OpType Operation;
MCSymbol *Label;
@ -286,7 +287,7 @@ namespace llvm {
}
MCCFIInstruction(OpType Op, MCSymbol *L, unsigned Register)
: Operation(Op), Label(L), Destination(Register) {
assert(Op == SameValue);
assert(Op == SameValue || Op == Restore);
}
MCCFIInstruction(MCSymbol *L, const MachineLocation &D,
const MachineLocation &S)

1
include/llvm/MC/MCStreamer.h
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@ -547,6 +547,7 @@ namespace llvm {
virtual void EmitCFIRememberState();
virtual void EmitCFIRestoreState();
virtual void EmitCFISameValue(int64_t Register);
virtual void EmitCFIRestore(int64_t Register);
virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
virtual void EmitCFIEscape(StringRef Values);

9
lib/MC/MCDwarf.cpp
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@ -987,6 +987,15 @@ void FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer,
Streamer.EmitULEB128IntValue(Reg);
return;
}
case MCCFIInstruction::Restore: {
unsigned Reg = Instr.getDestination().getReg();
if (VerboseAsm) {
Streamer.AddComment("DW_CFA_restore");
Streamer.AddComment(Twine("Reg ") + Twine(Reg));
}
Streamer.EmitIntValue(dwarf::DW_CFA_restore | Reg, 1);
return;
}
case MCCFIInstruction::Escape:
if (VerboseAsm) Streamer.AddComment("Escape bytes");
Streamer.EmitBytes(Instr.getValues(), 0);

16
lib/MC/MCParser/AsmParser.cpp
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@ -301,6 +301,8 @@ public:
&GenericAsmParser::ParseDirectiveCFIRestoreState>(".cfi_restore_state");
AddDirectiveHandler<
&GenericAsmParser::ParseDirectiveCFISameValue>(".cfi_same_value");
AddDirectiveHandler<
&GenericAsmParser::ParseDirectiveCFIRestore>(".cfi_restore");
AddDirectiveHandler<
&GenericAsmParser::ParseDirectiveCFIEscape>(".cfi_escape");
@ -336,6 +338,7 @@ public:
bool ParseDirectiveCFIRememberState(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFIRestoreState(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFISameValue(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFIRestore(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFIEscape(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveMacrosOnOff(StringRef, SMLoc DirectiveLoc);
@ -2815,6 +2818,19 @@ bool GenericAsmParser::ParseDirectiveCFISameValue(StringRef IDVal,
return false;
}
/// ParseDirectiveCFIRestore
/// ::= .cfi_restore register
bool GenericAsmParser::ParseDirectiveCFIRestore(StringRef IDVal,
SMLoc DirectiveLoc) {
int64_t Register = 0;
if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc))
return true;
getStreamer().EmitCFIRestore(Register);
return false;
}
/// ParseDirectiveCFIEscape
/// ::= .cfi_escape expression[,...]
bool GenericAsmParser::ParseDirectiveCFIEscape(StringRef IDVal,

9
lib/MC/MCStreamer.cpp
View File

@ -408,6 +408,15 @@ void MCStreamer::EmitCFISameValue(int64_t Register) {
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIRestore(int64_t Register) {
EnsureValidFrame();
MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
MCSymbol *Label = getContext().CreateTempSymbol();
EmitLabel(Label);
MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label, Register);
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIEscape(StringRef Values) {
EnsureValidFrame();
MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();

42
test/MC/ELF/cfi-restore.s Normal file
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@ -0,0 +1,42 @@
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | elf-dump --dump-section-data | FileCheck %s
f:
.cfi_startproc
nop
.cfi_restore %rbp
nop
.cfi_endproc
// CHECK: # Section 4
// CHECK-NEXT: (('sh_name', 0x00000011) # '.eh_frame'
// CHECK-NEXT: ('sh_type', 0x00000001)
// CHECK-NEXT: ('sh_flags', 0x0000000000000002)
// CHECK-NEXT: ('sh_addr', 0x0000000000000000)
// CHECK-NEXT: ('sh_offset', 0x0000000000000048)
// CHECK-NEXT: ('sh_size', 0x0000000000000030)
// CHECK-NEXT: ('sh_link', 0x00000000)
// CHECK-NEXT: ('sh_info', 0x00000000)
// CHECK-NEXT: ('sh_addralign', 0x0000000000000008)
// CHECK-NEXT: ('sh_entsize', 0x0000000000000000)
// CHECK-NEXT: ('_section_data', '14000000 00000000 017a5200 01781001 1b0c0708 90010000 14000000 1c000000 00000000 02000000 0041c600 00000000')
// CHECK-NEXT: ),
// CHECK-NEXT: # Section 5
// CHECK-NEXT: (('sh_name', 0x0000000c) # '.rela.eh_frame'
// CHECK-NEXT: ('sh_type', 0x00000004)
// CHECK-NEXT: ('sh_flags', 0x0000000000000000)
// CHECK-NEXT: ('sh_addr', 0x0000000000000000)
// CHECK-NEXT: ('sh_offset', 0x0000000000000390)
// CHECK-NEXT: ('sh_size', 0x0000000000000018)
// CHECK-NEXT: ('sh_link', 0x00000007)
// CHECK-NEXT: ('sh_info', 0x00000004)
// CHECK-NEXT: ('sh_addralign', 0x0000000000000008)
// CHECK-NEXT: ('sh_entsize', 0x0000000000000018)
// CHECK-NEXT: ('_relocations', [
// CHECK-NEXT: # Relocation 0
// CHECK-NEXT: (('r_offset', 0x0000000000000020)
// CHECK-NEXT: ('r_sym', 0x00000002)
// CHECK-NEXT: ('r_type', 0x00000002)
// CHECK-NEXT: ('r_addend', 0x0000000000000000)
// CHECK-NEXT: ),
// CHECK-NEXT: ])
// CHECK-NEXT: ),