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Implement .cfi_escape. Patch by Brian Anderson!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147352 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2011-12-29 20:24:47 +00:00
parent 19f18be449
commit 6f0b181bc7
6 changed files with 92 additions and 1 deletions
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10
include/llvm/MC/MCDwarf.h
View File

@ -271,13 +271,14 @@ namespace llvm {
class MCCFIInstruction {
public:
enum OpType { SameValue, Remember, Restore, Move, RelMove };
enum OpType { SameValue, Remember, Restore, Move, RelMove, Escape };
private:
OpType Operation;
MCSymbol *Label;
// Move to & from location.
MachineLocation Destination;
MachineLocation Source;
std::vector<char> Values;
public:
MCCFIInstruction(OpType Op, MCSymbol *L)
: Operation(Op), Label(L) {
@ -296,10 +297,17 @@ namespace llvm {
: Operation(Op), Label(L), Destination(D), Source(S) {
assert(Op == RelMove);
}
MCCFIInstruction(OpType Op, MCSymbol *L, StringRef Vals)
: Operation(Op), Label(L), Values(Vals.begin(), Vals.end()) {
assert(Op == Escape);
}
OpType getOperation() const { return Operation; }
MCSymbol *getLabel() const { return Label; }
const MachineLocation &getDestination() const { return Destination; }
const MachineLocation &getSource() const { return Source; }
const StringRef getValues() const {
return StringRef(&Values[0], Values.size());
}
};
struct MCDwarfFrameInfo {

1
include/llvm/MC/MCStreamer.h
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@ -549,6 +549,7 @@ namespace llvm {
virtual void EmitCFISameValue(int64_t Register);
virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
virtual void EmitCFIEscape(StringRef Values);
virtual void EmitWin64EHStartProc(const MCSymbol *Symbol);
virtual void EmitWin64EHEndProc();

4
lib/MC/MCDwarf.cpp
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@ -987,6 +987,10 @@ void FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer,
Streamer.EmitULEB128IntValue(Reg);
return;
}
case MCCFIInstruction::Escape:
if (VerboseAsm) Streamer.AddComment("Escape bytes");
Streamer.EmitBytes(Instr.getValues(), 0);
return;
}
llvm_unreachable("Unhandled case in switch");
}

27
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::ParseDirectiveCFIEscape>(".cfi_escape");
// Macro directives.
AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacrosOnOff>(
@ -334,6 +336,7 @@ public:
bool ParseDirectiveCFIRememberState(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFIRestoreState(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFISameValue(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFIEscape(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveMacrosOnOff(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveMacro(StringRef, SMLoc DirectiveLoc);
@ -2812,6 +2815,30 @@ bool GenericAsmParser::ParseDirectiveCFISameValue(StringRef IDVal,
return false;
}
/// ParseDirectiveCFIEscape
/// ::= .cfi_escape expression[,...]
bool GenericAsmParser::ParseDirectiveCFIEscape(StringRef IDVal,
SMLoc DirectiveLoc) {
std::string Values;
int64_t CurrValue;
if (getParser().ParseAbsoluteExpression(CurrValue))
return true;
Values.push_back((uint8_t)CurrValue);
while (getLexer().is(AsmToken::Comma)) {
Lex();
if (getParser().ParseAbsoluteExpression(CurrValue))
return true;
Values.push_back((uint8_t)CurrValue);
}
getStreamer().EmitCFIEscape(Values);
return false;
}
/// ParseDirectiveMacrosOnOff
/// ::= .macros_on
/// ::= .macros_off

9
lib/MC/MCStreamer.cpp
View File

@ -408,6 +408,15 @@ void MCStreamer::EmitCFISameValue(int64_t Register) {
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIEscape(StringRef Values) {
EnsureValidFrame();
MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
MCSymbol *Label = getContext().CreateTempSymbol();
EmitLabel(Label);
MCCFIInstruction Instruction(MCCFIInstruction::Escape, Label, Values);
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
W64UnwindInfos.push_back(Frame);
CurrentW64UnwindInfo = W64UnwindInfos.back();

42
test/MC/ELF/cfi-escape.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_escape 0x15, 7, 0x7f # DW_CFA_val_offset_sf, %esp, 8/-8
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 00411507 7f000000')
// 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: ),