[llvm] a405193 - [MC][AsmParser] Diagnose improperly nested .cfi frames
Jon Roelofs via llvm-commits
llvm-commits at lists.llvm.org
Fri Nov 17 09:45:45 PST 2023
Author: Jon Roelofs
Date: 2023-11-17T09:45:32-08:00
New Revision: a4051932895d9ef6c4516c42309a49912f69f740
URL: https://github.com/llvm/llvm-project/commit/a4051932895d9ef6c4516c42309a49912f69f740
DIFF: https://github.com/llvm/llvm-project/commit/a4051932895d9ef6c4516c42309a49912f69f740.diff
LOG: [MC][AsmParser] Diagnose improperly nested .cfi frames
This showed up when simplifying some large testcase, where the cfi directives
became out of sync with the proc's they enclose.
rdar://111459507
Differential revision: https://reviews.llvm.org/D155245
Added:
llvm/test/MC/AArch64/cfi-bad-nesting.s
Modified:
llvm/lib/MC/MCParser/AsmParser.cpp
Removed:
################################################################################
diff --git a/llvm/lib/MC/MCParser/AsmParser.cpp b/llvm/lib/MC/MCParser/AsmParser.cpp
index b36c5f067a95392..9c3fd476f21ba53 100644
--- a/llvm/lib/MC/MCParser/AsmParser.cpp
+++ b/llvm/lib/MC/MCParser/AsmParser.cpp
@@ -125,6 +125,7 @@ class AsmParser : public MCAsmParser {
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 @@ bool AsmParser::parseStatement(ParseStatementInfo &Info,
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 @@ bool AsmParser::parseDirectiveCFISections() {
/// 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 @@ bool AsmParser::parseDirectiveCFIStartProc() {
/// parseDirectiveCFIEndProc
/// ::= .cfi_endproc
bool AsmParser::parseDirectiveCFIEndProc() {
+ CFIStartProcLoc = std::nullopt;
+
if (parseEOL())
return true;
+
getStreamer().emitCFIEndProc();
return false;
}
diff --git a/llvm/test/MC/AArch64/cfi-bad-nesting.s b/llvm/test/MC/AArch64/cfi-bad-nesting.s
new file mode 100644
index 000000000000000..3a1a06e21394a74
--- /dev/null
+++ b/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
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