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MC: Better management of macro arguments

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The linux kernel makes uses of a GAS `feature' which substitutes nothing
for macro arguments which aren't specified.

Proper support for these kind of macro arguments necessitated a cleanup of
differences between `GAS' and `Darwin' dialect macro processing.

Differential Revision: http://llvm-reviews.chandlerc.com/D2634


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200409 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer 2014-01-29 18:57:46 +00:00
parent fb70e11bbc
commit 654247c3ea
3 changed files with 39 additions and 76 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
lib/MC/MCParser/AsmParser.cpp
View File

@ -287,11 +287,8 @@ private:
/// \brief Handle exit from macro instantiation.
void handleMacroExit();
/// \brief Extract AsmTokens for a macro argument. If the argument delimiter
/// is initially unknown, set it to AsmToken::Eof. It will be set to the
/// correct delimiter by the method.
bool parseMacroArgument(MCAsmMacroArgument &MA,
AsmToken::TokenKind &ArgumentDelimiter);
/// \brief Extract AsmTokens for a macro argument.
bool parseMacroArgument(MCAsmMacroArgument &MA);
/// \brief Parse all macro arguments for a given macro.
bool parseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A);
@ -1879,8 +1876,7 @@ private:
};
}
bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA,
AsmToken::TokenKind &ArgumentDelimiter) {
bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA) {
unsigned ParenLevel = 0;
unsigned AddTokens = 0;
@ -1891,14 +1887,8 @@ bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA,
if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal))
return TokError("unexpected token in macro instantiation");
if (ParenLevel == 0 && Lexer.is(AsmToken::Comma)) {
// Spaces and commas cannot be mixed to delimit parameters
if (ArgumentDelimiter == AsmToken::Eof)
ArgumentDelimiter = AsmToken::Comma;
else if (ArgumentDelimiter != AsmToken::Comma)
return TokError("expected ' ' for macro argument separator");
if (ParenLevel == 0 && Lexer.is(AsmToken::Comma))
break;
}
if (Lexer.is(AsmToken::Space)) {
Lex(); // Eat spaces
@ -1906,8 +1896,7 @@ bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA,
// Spaces can delimit parameters, but could also be part an expression.
// If the token after a space is an operator, add the token and the next
// one into this argument
if (ArgumentDelimiter == AsmToken::Space ||
ArgumentDelimiter == AsmToken::Eof) {
if (!IsDarwin) {
if (isOperator(Lexer.getKind())) {
// Check to see whether the token is used as an operator,
// or part of an identifier
@ -1917,9 +1906,6 @@ bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA,
}
if (!AddTokens && ParenLevel == 0) {
if (ArgumentDelimiter == AsmToken::Eof &&
!isOperator(Lexer.getKind()))
ArgumentDelimiter = AsmToken::Space;
break;
}
}
@ -1952,9 +1938,6 @@ bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA,
bool AsmParser::parseMacroArguments(const MCAsmMacro *M,
MCAsmMacroArguments &A) {
const unsigned NParameters = M ? M->Parameters.size() : 0;
// Argument delimiter is initially unknown. It will be set by
// parseMacroArgument()
AsmToken::TokenKind ArgumentDelimiter = AsmToken::Eof;
// Parse two kinds of macro invocations:
// - macros defined without any parameters accept an arbitrary number of them
@ -1963,14 +1946,16 @@ bool AsmParser::parseMacroArguments(const MCAsmMacro *M,
++Parameter) {
MCAsmMacroArgument MA;
if (parseMacroArgument(MA, ArgumentDelimiter))
if (parseMacroArgument(MA))
return true;
if (!MA.empty() || !NParameters)
if (!MA.empty() || (!NParameters && !Lexer.is(AsmToken::EndOfStatement)))
A.push_back(MA);
else if (NParameters) {
if (!M->Parameters[Parameter].second.empty())
A.push_back(M->Parameters[Parameter].second);
else
A.push_back(MA);
}
// At the end of the statement, fill in remaining arguments that have
@ -1978,12 +1963,7 @@ bool AsmParser::parseMacroArguments(const MCAsmMacro *M,
// required but missing
if (Lexer.is(AsmToken::EndOfStatement)) {
if (NParameters && Parameter < NParameters - 1) {
if (M->Parameters[Parameter + 1].second.empty())
return TokError("macro argument '" +
Twine(M->Parameters[Parameter + 1].first) +
"' is missing");
else
continue;
continue;
}
return false;
}
@ -2021,12 +2001,6 @@ bool AsmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) {
if (parseMacroArguments(M, A))
return true;
// Remove any trailing empty arguments. Do this after-the-fact as we have
// to keep empty arguments in the middle of the list or positionality
// gets off. e.g., "foo 1, , 2" vs. "foo 1, 2,"
while (!A.empty() && A.back().empty())
A.pop_back();
// Macro instantiation is lexical, unfortunately. We construct a new buffer
// to hold the macro body with substitutions.
SmallString<256> Buf;
@ -3113,28 +3087,21 @@ bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) {
return TokError("expected identifier in '.macro' directive");
MCAsmMacroParameters Parameters;
// Argument delimiter is initially unknown. It will be set by
// parseMacroArgument()
AsmToken::TokenKind ArgumentDelimiter = AsmToken::Eof;
if (getLexer().isNot(AsmToken::EndOfStatement)) {
for (;;) {
MCAsmMacroParameter Parameter;
if (parseIdentifier(Parameter.first))
return TokError("expected identifier in '.macro' directive");
while (getLexer().isNot(AsmToken::EndOfStatement)) {
MCAsmMacroParameter Parameter;
if (parseIdentifier(Parameter.first))
return TokError("expected identifier in '.macro' directive");
if (getLexer().is(AsmToken::Equal)) {
Lex();
if (parseMacroArgument(Parameter.second, ArgumentDelimiter))
return true;
}
Parameters.push_back(Parameter);
if (getLexer().is(AsmToken::Comma))
Lex();
else if (getLexer().is(AsmToken::EndOfStatement))
break;
if (getLexer().is(AsmToken::Equal)) {
Lex();
if (parseMacroArgument(Parameter.second))
return true;
}
Parameters.push_back(Parameter);
if (getLexer().is(AsmToken::Comma))
Lex();
}
// Eat the end of statement.

8
test/MC/AsmParser/macros-darwin.s
View File

@ -86,12 +86,8 @@ test8 x - y, z, 1
// CHECK: .globl "1 2 3"
test9 1, 2,3
// CHECK: .globl "1,23,"
test8 1,2 3
// CHECK-ERRORS: error: macro argument '_c' is missing
// CHECK-ERRORS-NEXT: test8 1,2 3
// CHECK-ERRORS-NEXT: ^
// CHECK: .globl "12,3,"
test8 1 2, 3
// CHECK-ERRORS: error: macro argument '_c' is missing
// CHECK-ERRORS-NEXT:test8 1 2, 3
// CHECK-ERRORS-NEXT: ^

28
test/MC/AsmParser/macros-gas.s
View File

@ -32,17 +32,21 @@ test2 10
// CHECK: .ascii "1 2 3 \003"
test3 1, 2, 3
// FIXME: test3 1, 2 3 should be treated like test 1, 2, 3
// CHECK: .ascii "1 2 3 \003"
test3 1, 2 3
// FIXME: remove the n argument from the remaining test3 examples
// CHECK: .ascii "1 (23) n \n"
test3 1, (2 3), n
.macro test3_prime _a _b _c
.ascii "\_a \_b \_c"
.endm
// CHECK: .ascii "1 (23) n \n"
test3 1 (2 3) n
// CHECK: .ascii "1 (23) "
test3_prime 1, (2 3)
// CHECK: .ascii "1 2 n \n"
test3 1 2 n
// CHECK: .ascii "1 (23) "
test3_prime 1 (2 3)
// CHECK: .ascii "1 2 "
test3_prime 1 2
.macro test5 _a
.globl \_a
@ -82,12 +86,8 @@ test8 x - y z 1
// CHECK: .ascii "1 2 3"
test9 1, 2,3
// CHECK: .ascii "1,2,3"
test8 1,2 3
// CHECK-ERRORS: error: macro argument '_c' is missing
// CHECK-ERRORS-NEXT: test8 1,2 3
// CHECK-ERRORS-NEXT: ^
// CHECK: .ascii "1,2,3"
test8 1 2, 3
// CHECK-ERRORS: error: expected ' ' for macro argument separator
// CHECK-ERRORS-NEXT:test8 1 2, 3
// CHECK-ERRORS-NEXT: ^