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Add support for assigning to . in AsmParser.

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This is implemented by handling assignments to the '.' pseudo symbol
as ".org" directives.

Differential Revision: http://llvm-reviews.chandlerc.com/D2625



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201530 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anders Waldenborg 2014-02-17 20:48:32 +00:00
parent 3457506fb9
commit 1410f7ffc6
6 changed files with 81 additions and 12 deletions
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14
lib/MC/MCParser/AsmParser.cpp
View File

@ -2119,12 +2119,6 @@ bool AsmParser::parseAssignment(StringRef Name, bool allow_redef,
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in assignment");
// Error on assignment to '.'.
if (Name == ".") {
return Error(EqualLoc, ("assignment to pseudo-symbol '.' is unsupported "
"(use '.space' or '.org').)"));
}
// Eat the end of statement marker.
Lex();
@ -2152,11 +2146,15 @@ bool AsmParser::parseAssignment(StringRef Name, bool allow_redef,
// Don't count these checks as uses.
Sym->setUsed(false);
} else if (Name == ".") {
if (Out.EmitValueToOffset(Value, 0)) {
Error(EqualLoc, "expected absolute expression");
eatToEndOfStatement();
}
return false;
} else
Sym = getContext().GetOrCreateSymbol(Name);
// FIXME: Handle '.'.
// Do the assignment.
Out.EmitAssignment(Sym, Value);
if (NoDeadStrip)

12
test/MC/AsmParser/dot-symbol-assignment-backwards.s Normal file
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@ -0,0 +1,12 @@
# RUN: not llvm-mc -filetype=obj -triple i386-unknown-unknown %s 2> %t
# RUN: FileCheck -input-file %t %s
. = 0x10
.byte 1
. = . + 10
.byte 2
# CHECK: LLVM ERROR: invalid .org offset '24' (at offset '28')
. = 0x18
.byte 3

31
test/MC/AsmParser/dot-symbol-assignment.s Normal file
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@ -0,0 +1,31 @@
# RUN: llvm-mc -triple i386-unknown-unknown %s | FileCheck %s
.extern start
# CHECK: .org 1024, 0
. = 0x400
lgdt 0x400 + 0x100
ljmpl $0x08, $(0x400 + 0x150)
# CHECK: .org 1280, 0
. = 0x400 + 0x100
.word (3*8)-1
.quad (0x400 + 0x110)
# CHECK: .org 1296, 0
. = 0x400 + 0x110
.quad 0x0
.quad 0x0020980000000000
.quad 0x0000900000000000
.code64
# CHECK: .org 1360, 0
. = 0x400 + 0x150
movabsq $start, %rcx
jmp *%rcx
. = 0x300

9
test/MC/AsmParser/dot-symbol-non-absolute.s Normal file
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@ -0,0 +1,9 @@
# RUN: not llvm-mc -filetype=obj -triple i386-unknown-unknown %s 2> %t
# RUN: FileCheck -input-file %t %s
.extern foo
# CHECK: error: expected absolute expression
. = foo + 10
.byte 1

5
test/MC/AsmParser/dot-symbol.s
View File

@ -1,12 +1,9 @@
# Historically 'as' treats '.' as a reference to the current location in
# arbitrary contects. We don't support this in general.
# arbitrary contexts. We don't support this in general.
# RUN: not llvm-mc -triple i386-unknown-unknown %s 2> %t
# RUN: FileCheck -input-file %t %s
# CHECK: assignment to pseudo-symbol '.' is unsupported (use '.space' or '.org').
. = . + 8
# CHECK: invalid use of pseudo-symbol '.' as a label
.:
.long 0

22
test/MC/ELF/dot-symbol-assignment.s Normal file
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@ -0,0 +1,22 @@
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | llvm-readobj -sections -section-data | FileCheck %s
one:
.quad 0xffffffffffffffff
. = . + 16
two:
.quad 0xeeeeeeeeeeeeeeee
. = 0x20
three:
.quad 0xdddddddddddddddd
// CHECK: Section {
// CHECK: Name: .text
// CHECK-NEXT: Type:
// CHECK-NEXT: Flags [
// CHECK: SectionData (
// CHECK-NEXT: 0000: FFFFFFFF FFFFFFFF 00000000 00000000
// CHECK-NEXT: 0010: 00000000 00000000 EEEEEEEE EEEEEEEE
// CHECK-NEXT: 0020: DDDDDDDD DDDDDDDD
// CHECK-NEXT: )