Generate the DWARF stack frame decode operations in the function prologue for ARM/Thumb functions.
Patch by Keith Walker!
llvm-svn: 201423
diff --git a/llvm/lib/CodeGen/AsmPrinter/ARMException.cpp b/llvm/lib/CodeGen/AsmPrinter/ARMException.cpp
index 6e79bef..403feb4 100644
--- a/llvm/lib/CodeGen/AsmPrinter/ARMException.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/ARMException.cpp
@@ -37,7 +37,8 @@
using namespace llvm;
ARMException::ARMException(AsmPrinter *A)
- : DwarfException(A) {}
+ : DwarfException(A),
+ shouldEmitCFI(false) {}
ARMException::~ARMException() {}
@@ -46,7 +47,11 @@
return static_cast<ARMTargetStreamer &>(TS);
}
+/// endModule - Emit all exception information that should come after the
+/// content.
void ARMException::endModule() {
+ if (shouldEmitCFI)
+ Asm->OutStreamer.EmitCFISections(false, true);
}
/// beginFunction - Gather pre-function exception information. Assumes it's
@@ -56,11 +61,22 @@
if (Asm->MF->getFunction()->needsUnwindTableEntry())
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
Asm->getFunctionNumber()));
+ // See if we need call frame info.
+ AsmPrinter::CFIMoveType MoveType = Asm->needsCFIMoves();
+ assert(MoveType != AsmPrinter::CFI_M_EH &&
+ "non-EH CFI not yet supported in prologue with EHABI lowering");
+ if (MoveType == AsmPrinter::CFI_M_Debug) {
+ shouldEmitCFI = true;
+ Asm->OutStreamer.EmitCFIStartProc(false);
+ }
}
/// endFunction - Gather and emit post-function exception information.
///
void ARMException::endFunction(const MachineFunction *) {
+ if (shouldEmitCFI)
+ Asm->OutStreamer.EmitCFIEndProc();
+
ARMTargetStreamer &ATS = getTargetStreamer();
if (!Asm->MF->getFunction()->needsUnwindTableEntry())
ATS.emitCantUnwind();