The .even directive aligns content to an evan-numbered address.
In at&t syntax .even
In Microsoft syntax even (without the dot).
Differential Revision: http://reviews.llvm.org/D15413
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255462
91177308-0d34-0410-b5e6-
96231b3b80d8
enum AsmRewriteKind {
AOK_Delete = 0, // Rewrite should be ignored.
AOK_Align, // Rewrite align as .align.
enum AsmRewriteKind {
AOK_Delete = 0, // Rewrite should be ignored.
AOK_Align, // Rewrite align as .align.
+ AOK_EVEN, // Rewrite even as .even.
AOK_DotOperator, // Rewrite a dot operator expression as an immediate.
// E.g., [eax].foo.bar -> [eax].8
AOK_Emit, // Rewrite _emit as .byte.
AOK_DotOperator, // Rewrite a dot operator expression as an immediate.
// E.g., [eax].foo.bar -> [eax].8
AOK_Emit, // Rewrite _emit as .byte.
const char AsmRewritePrecedence [] = {
0, // AOK_Delete
2, // AOK_Align
const char AsmRewritePrecedence [] = {
0, // AOK_Delete
2, // AOK_Align
2, // AOK_DotOperator
2, // AOK_Emit
4, // AOK_Imm
2, // AOK_DotOperator
2, // AOK_Emit
4, // AOK_Imm
if (ParsingInlineAsm && (IDVal == "align" || IDVal == "ALIGN"))
return parseDirectiveMSAlign(IDLoc, Info);
if (ParsingInlineAsm && (IDVal == "align" || IDVal == "ALIGN"))
return parseDirectiveMSAlign(IDLoc, Info);
+ if (ParsingInlineAsm && (IDVal == "even"))
+ Info.AsmRewrites->emplace_back(AOK_EVEN, IDLoc, 4);
checkForValidSection();
// Canonicalize the opcode to lower case.
checkForValidSection();
// Canonicalize the opcode to lower case.
AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4;
break;
}
AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4;
break;
}
+ case AOK_EVEN:
+ OS << ".even";
+ break;
case AOK_DotOperator:
// Insert the dot if the user omitted it.
OS.flush();
case AOK_DotOperator:
// Insert the dot if the user omitted it.
OS.flush();
#include "llvm/MC/MCParser/MCAsmParser.h"
#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCParser/MCAsmParser.h"
#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
SMLoc End, unsigned Size, StringRef Identifier,
InlineAsmIdentifierInfo &Info);
SMLoc End, unsigned Size, StringRef Identifier,
InlineAsmIdentifierInfo &Info);
+ bool parseDirectiveEven(SMLoc L);
bool ParseDirectiveWord(unsigned Size, SMLoc L);
bool ParseDirectiveCode(StringRef IDVal, SMLoc L);
bool ParseDirectiveWord(unsigned Size, SMLoc L);
bool ParseDirectiveCode(StringRef IDVal, SMLoc L);
"a '%' prefix in .intel_syntax");
}
return false;
"a '%' prefix in .intel_syntax");
}
return false;
+ } else if (IDVal == ".even")
+ return parseDirectiveEven(DirectiveID.getLoc());
+/// parseDirectiveEven
+/// ::= .even
+bool X86AsmParser::parseDirectiveEven(SMLoc L) {
+ const MCSection *Section = getStreamer().getCurrentSection().first;
+ if (getLexer().isNot(AsmToken::EndOfStatement)) {
+ TokError("unexpected token in directive");
+ return false;
+ }
+ if (!Section) {
+ getStreamer().InitSections(false);
+ Section = getStreamer().getCurrentSection().first;
+ }
+ if (Section->UseCodeAlign())
+ getStreamer().EmitCodeAlignment(2, 0);
+ else
+ getStreamer().EmitValueToAlignment(2, 0, 1, 0);
+ return false;
+}
/// ParseDirectiveWord
/// ::= .word [ expression (, expression)* ]
bool X86AsmParser::ParseDirectiveWord(unsigned Size, SMLoc L) {
/// ParseDirectiveWord
/// ::= .word [ expression (, expression)* ]
bool X86AsmParser::ParseDirectiveWord(unsigned Size, SMLoc L) {
--- /dev/null
+# RUN: llvm-mc -filetype obj -o - %s | llvm-readobj -s -sd \
+# RUN: | FileCheck %s
+
+ .text
+ even_check:
+ .byte 0x00
+ .byte 0x01
+ .byte 0x02
+ .byte 0x03
+ .byte 0x04
+ .byte 0x05
+ .byte 0x06
+ .byte 0x07
+ .byte 0x08
+ .byte 0x09
+ .byte 0x10
+ .even
+ .byte 0x11
+ .byte 0x12
+ .even
+ .byte 0x13
+ .even
+ .byte 0x00
+ .byte 0x01
+ .byte 0x02
+ .byte 0x03
+ .byte 0x04
+ .byte 0x05
+ .byte 0x06
+ .byte 0x07
+ .byte 0x08
+ .byte 0x09
+ .byte 0x10
+ .byte 0x11
+ .byte 0x12
+ .byte 0x13
+ .byte 0x14
+ .byte 0x15
+
+# CHECK: Section {
+# CHECK: Name: .text
+# CHECK: SectionData (
+# CHECK: 0000: 00010203 04050607 08091090 11121390
+# CHECK: 0010: 00010203 04050607 08091011 12131415
+# CHECK: )
+# CHECK: }
+