From c21742112b4b06bf2fd368ece71d27996d13408b Mon Sep 17 00:00:00 2001 From: Rafael Espindola Date: Tue, 30 Aug 2011 19:39:58 +0000 Subject: Emit segmented-stack specific code into function prologues for X86. Modify the pass added in the previous patch to call this new code. This new prologues generated will call a libgcc routine (__morestack) to allocate more stack space from the heap when required Patch by Sanjoy Das. llvm-svn: 138812 --- llvm/lib/CodeGen/PrologEpilogInserter.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'llvm/lib/CodeGen/PrologEpilogInserter.cpp') diff --git a/llvm/lib/CodeGen/PrologEpilogInserter.cpp b/llvm/lib/CodeGen/PrologEpilogInserter.cpp index 7e5d804f913..ec5fe25704a 100644 --- a/llvm/lib/CodeGen/PrologEpilogInserter.cpp +++ b/llvm/lib/CodeGen/PrologEpilogInserter.cpp @@ -29,6 +29,7 @@ #include "llvm/CodeGen/MachineRegisterInfo.h" #include "llvm/CodeGen/RegisterScavenging.h" #include "llvm/Target/TargetMachine.h" +#include "llvm/Target/TargetOptions.h" #include "llvm/Target/TargetRegisterInfo.h" #include "llvm/Target/TargetFrameLowering.h" #include "llvm/Target/TargetInstrInfo.h" @@ -699,6 +700,13 @@ void PEI::insertPrologEpilogCode(MachineFunction &Fn) { if (!I->empty() && I->back().getDesc().isReturn()) TFI.emitEpilogue(Fn, *I); } + + // Emit additional code that is required support segmented stacks, if we've + // been asked for it. This, when linked with a runtime with support for + // segmented stacks (libgcc is one), will result allocating stack space in + // small chunks instead of one large contiguous block. + if (EnableSegmentedStacks) + TFI.adjustForSegmentedStacks(Fn); } /// replaceFrameIndices - Replace all MO_FrameIndex operands with physical -- cgit v1.2.3