[PATCH] D155245: [MC][AsmParser] Diagnose improperly nested .cfi frames
Jon Roelofs via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Nov 17 09:45:56 PST 2023
This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGa4051932895d: [MC][AsmParser] Diagnose improperly nested .cfi frames (authored by jroelofs).
Changed prior to commit:
https://reviews.llvm.org/D155245?vs=558108&id=558127#toc
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D155245/new/
https://reviews.llvm.org/D155245
Files:
llvm/lib/MC/MCParser/AsmParser.cpp
llvm/test/MC/AArch64/cfi-bad-nesting.s
Index: llvm/test/MC/AArch64/cfi-bad-nesting.s
===================================================================
--- /dev/null
+++ llvm/test/MC/AArch64/cfi-bad-nesting.s
@@ -0,0 +1,23 @@
+; RUN: not llvm-mc -triple arm64-apple-darwin %s -filetype=obj -o /dev/null 2>&1 | FileCheck %s
+
+; REQUIRES: aarch64-registered-target
+
+ .section __TEXT,locomotive,regular,pure_instructions
+
+ .globl _locomotive
+ .p2align 2
+_locomotive:
+ .cfi_startproc
+ ret
+
+ ; It is invalid to have a non-private label between .cfi_startproc / .cfi_endproc
+ .section __TEXT,__text,regular,pure_instructions
+ .globl _caboose
+ .p2align 2
+_caboose:
+; CHECK: [[#@LINE-1]]:1: error: non-private labels cannot appear between .cfi_startproc / .cfi_endproc pairs
+; CHECK: [[#@LINE-9]]:2: error: previous .cfi_startproc was here
+ ret
+ .cfi_endproc
+
+.subsections_via_symbols
\ No newline at end of file
Index: llvm/lib/MC/MCParser/AsmParser.cpp
===================================================================
--- llvm/lib/MC/MCParser/AsmParser.cpp
+++ llvm/lib/MC/MCParser/AsmParser.cpp
@@ -125,6 +125,7 @@
void *SavedDiagContext;
std::unique_ptr<MCAsmParserExtension> PlatformParser;
SMLoc StartTokLoc;
+ std::optional<SMLoc> CFIStartProcLoc;
/// This is the current buffer index we're lexing from as managed by the
/// SourceMgr object.
@@ -1949,6 +1950,11 @@
Lex();
}
+ if (CFIStartProcLoc && Sym->isExternal())
+ return Error(StartTokLoc, "non-private labels cannot appear between "
+ ".cfi_startproc / .cfi_endproc pairs") &&
+ Error(*CFIStartProcLoc, "previous .cfi_startproc was here");
+
if (discardLTOSymbol(IDVal))
return false;
@@ -4193,6 +4199,8 @@
/// parseDirectiveCFIStartProc
/// ::= .cfi_startproc [simple]
bool AsmParser::parseDirectiveCFIStartProc() {
+ CFIStartProcLoc = StartTokLoc;
+
StringRef Simple;
if (!parseOptionalToken(AsmToken::EndOfStatement)) {
if (check(parseIdentifier(Simple) || Simple != "simple",
@@ -4213,8 +4221,11 @@
/// parseDirectiveCFIEndProc
/// ::= .cfi_endproc
bool AsmParser::parseDirectiveCFIEndProc() {
+ CFIStartProcLoc = std::nullopt;
+
if (parseEOL())
return true;
+
getStreamer().emitCFIEndProc();
return false;
}
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