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-rw-r--r--llvm/lib/Target/X86/X86FrameLowering.cpp34
1 files changed, 31 insertions, 3 deletions
diff --git a/llvm/lib/Target/X86/X86FrameLowering.cpp b/llvm/lib/Target/X86/X86FrameLowering.cpp
index 83446336fd7..ab219f680ba 100644
--- a/llvm/lib/Target/X86/X86FrameLowering.cpp
+++ b/llvm/lib/Target/X86/X86FrameLowering.cpp
@@ -2298,6 +2298,28 @@ void X86FrameLowering::adjustForSegmentedStacks(
#endif
}
+/// Lookup an ERTS parameter in the !hipe.literals named metadata node.
+/// HiPE provides Erlang Runtime System-internal parameters, such as PCB offsets
+/// to fields it needs, through a named metadata node "hipe.literals" containing
+/// name-value pairs.
+static unsigned getHiPELiteral(
+ NamedMDNode *HiPELiteralsMD, const StringRef LiteralName) {
+ for (int i = 0, e = HiPELiteralsMD->getNumOperands(); i != e; ++i) {
+ MDNode *Node = HiPELiteralsMD->getOperand(i);
+ if (Node->getNumOperands() != 2) continue;
+ MDString *NodeName = dyn_cast<MDString>(Node->getOperand(0));
+ ValueAsMetadata *NodeVal = dyn_cast<ValueAsMetadata>(Node->getOperand(1));
+ if (!NodeName || !NodeVal) continue;
+ ConstantInt *ValConst = dyn_cast_or_null<ConstantInt>(NodeVal->getValue());
+ if (ValConst && NodeName->getString() == LiteralName) {
+ return ValConst->getZExtValue();
+ }
+ }
+
+ report_fatal_error("HiPE literal " + LiteralName
+ + " required but not provided");
+}
+
/// Erlang programs may need a special prologue to handle the stack size they
/// might need at runtime. That is because Erlang/OTP does not implement a C
/// stack but uses a custom implementation of hybrid stack/heap architecture.
@@ -2323,7 +2345,14 @@ void X86FrameLowering::adjustForHiPEPrologue(
assert(&(*MF.begin()) == &PrologueMBB && "Shrink-wrapping not supported yet");
// HiPE-specific values
- const unsigned HipeLeafWords = 24;
+ NamedMDNode *HiPELiteralsMD = MF.getMMI().getModule()
+ ->getNamedMetadata("hipe.literals");
+ if (!HiPELiteralsMD)
+ report_fatal_error(
+ "Can't generate HiPE prologue without runtime parameters");
+ const unsigned HipeLeafWords
+ = getHiPELiteral(HiPELiteralsMD,
+ Is64Bit ? "AMD64_LEAF_WORDS" : "X86_LEAF_WORDS");
const unsigned CCRegisteredArgs = Is64Bit ? 6 : 5;
const unsigned Guaranteed = HipeLeafWords * SlotSize;
unsigned CallerStkArity = MF.getFunction()->arg_size() > CCRegisteredArgs ?
@@ -2395,20 +2424,19 @@ void X86FrameLowering::adjustForHiPEPrologue(
unsigned ScratchReg, SPReg, PReg, SPLimitOffset;
unsigned LEAop, CMPop, CALLop;
+ SPLimitOffset = getHiPELiteral(HiPELiteralsMD, "P_NSP_LIMIT");
if (Is64Bit) {
SPReg = X86::RSP;
PReg = X86::RBP;
LEAop = X86::LEA64r;
CMPop = X86::CMP64rm;
CALLop = X86::CALL64pcrel32;
- SPLimitOffset = 0x90;
} else {
SPReg = X86::ESP;
PReg = X86::EBP;
LEAop = X86::LEA32r;
CMPop = X86::CMP32rm;
CALLop = X86::CALLpcrel32;
- SPLimitOffset = 0x4c;
}
ScratchReg = GetScratchRegister(Is64Bit, IsLP64, MF, true);
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