diff options
| author | Roman Divacky <rdivacky@freebsd.org> | 2012-08-28 19:06:55 +0000 |
|---|---|---|
| committer | Roman Divacky <rdivacky@freebsd.org> | 2012-08-28 19:06:55 +0000 |
| commit | c6c2ced38411215e5bf46ded787c23810160dfa7 (patch) | |
| tree | 4361f01a9682f0e2516684cd88b2dff52a0e2505 | |
| parent | 4fb08317af55c97f421047f0bdbfdd320ac76936 (diff) | |
Emit word of zeroes after the last instruction as a start of the mandatory
traceback table on PowerPC64. This helps gdb handle exceptions. The other
mandatory fields are ignored by gdb and harder to implement so just add
there a FIXME.
Patch by Bill Schmidt. PR13641.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162778 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/PowerPC/PPCAsmPrinter.cpp | 15 | ||||
| -rw-r--r-- | test/CodeGen/PowerPC/pr13641.ll | 10 |
2 files changed, 25 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/PPCAsmPrinter.cpp b/lib/Target/PowerPC/PPCAsmPrinter.cpp index 5bd8617ccf..de3241504d 100644 --- a/lib/Target/PowerPC/PPCAsmPrinter.cpp +++ b/lib/Target/PowerPC/PPCAsmPrinter.cpp @@ -109,6 +109,8 @@ namespace { bool doFinalization(Module &M); virtual void EmitFunctionEntryLabel(); + + void EmitFunctionBodyEnd(); }; /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac @@ -450,6 +452,19 @@ bool PPCLinuxAsmPrinter::doFinalization(Module &M) { return AsmPrinter::doFinalization(M); } +/// EmitFunctionBodyEnd - Print the traceback table before the .size +/// directive. +/// +void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() { + // Only the 64-bit target requires a traceback table. For now, + // we only emit the word of zeroes that GDB requires to find + // the end of the function. + // FIXME: Eventually we should add the eight-byte mandatory fields + // described in the PPC64 ELF ABI. + if (Subtarget.isPPC64()) + OutStreamer.EmitIntValue(0, 4/*size*/); +} + void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) { static const char *const CPUDirectives[] = { "", diff --git a/test/CodeGen/PowerPC/pr13641.ll b/test/CodeGen/PowerPC/pr13641.ll new file mode 100644 index 0000000000..e80fbea36d --- /dev/null +++ b/test/CodeGen/PowerPC/pr13641.ll @@ -0,0 +1,10 @@ +; RUN: llc < %s | FileCheck %s +target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64" +target triple = "powerpc64-unknown-linux-gnu" + +define void @foo() nounwind { + ret void +} + +; CHECK: blr +; CHECK-NEXT: .long 0 |