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Add support for the .zero directive.

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llvm-svn: 114077
This commit is contained in:
Rafael Espindola 2010-09-16 15:03:59 +00:00
parent 68e2c15954
commit 58aa9e8010
2 changed files with 37 additions and 0 deletions
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22
lib/MC/MCParser/AsmParser.cpp
View File

@ -180,6 +180,7 @@ private:
bool ParseDirectiveValue(unsigned Size); // ".byte", ".long", ...
bool ParseDirectiveFill(); // ".fill"
bool ParseDirectiveSpace(); // ".space"
bool ParseDirectiveZero(); // ".zero"
bool ParseDirectiveSet(); // ".set"
bool ParseDirectiveOrg(); // ".org"
// ".align{,32}", ".p2align{,w,l}"
@ -871,6 +872,8 @@ bool AsmParser::ParseStatement() {
return ParseDirectiveFill();
if (IDVal == ".space")
return ParseDirectiveSpace();
if (IDVal == ".zero")
return ParseDirectiveZero();
// Symbol attribute directives
@ -1353,6 +1356,25 @@ bool AsmParser::ParseDirectiveSpace() {
return false;
}
/// ParseDirectiveZero
/// ::= .zero expression
bool AsmParser::ParseDirectiveZero() {
CheckForValidSection();
int64_t NumBytes;
if (ParseAbsoluteExpression(NumBytes))
return true;
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.zero' directive");
Lex();
getStreamer().EmitFill(NumBytes, 0, DEFAULT_ADDRSPACE);
return false;
}
/// ParseDirectiveFill
/// ::= .fill expression , expression , expression
bool AsmParser::ParseDirectiveFill() {

15
test/MC/ELF/zero.s Normal file
View File

@ -0,0 +1,15 @@
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | elf-dump --dump-section-data | FileCheck %s
.zero 4
// CHECK: ('sh_name', 1) # '.text'
// CHECK: ('sh_type', 1)
// CHECK: ('sh_flags', 6)
// CHECK: ('sh_addr', 0)
// CHECK: ('sh_offset', 64)
// CHECK: ('sh_size', 4)
// CHECK: ('sh_link', 0)
// CHECK: ('sh_info', 0)
// CHECK: ('sh_addralign', 4)
// CHECK: ('sh_entsize', 0)
// CHECK: ('_section_data', '00000000')