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Encode the Caml frametable by following what the comment says: the number of descriptors

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is first emitted, and StackOffsets are emitted in 16 bits.

llvm-svn: 104488
This commit is contained in:
Nicolas Geoffray 2010-05-24 12:24:11 +00:00
parent f2bec8edf6
commit 803f2761ec
1 changed files with 22 additions and 5 deletions
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27
lib/CodeGen/AsmPrinter/OcamlGCPrinter.cpp
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@ -104,6 +104,21 @@ void OcamlGCMetadataPrinter::finishAssembly(AsmPrinter &AP) {
AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
EmitCamlGlobal(getModule(), AP, "frametable");
int NumDescriptors = 0;
for (iterator I = begin(), IE = end(); I != IE; ++I) {
GCFunctionInfo &FI = **I;
for (GCFunctionInfo::iterator J = FI.begin(), JE = FI.end(); J != JE; ++J) {
NumDescriptors++;
}
}
if (NumDescriptors >= 1<<16) {
// Very rude!
report_fatal_error(" Too much descriptor for ocaml GC");
}
AP.EmitInt16(NumDescriptors);
AP.EmitAlignment(IntPtrSize == 4 ? 2 : 3);
for (iterator I = begin(), IE = end(); I != IE; ++I) {
GCFunctionInfo &FI = **I;
@ -135,11 +150,13 @@ void OcamlGCMetadataPrinter::finishAssembly(AsmPrinter &AP) {
for (GCFunctionInfo::live_iterator K = FI.live_begin(J),
KE = FI.live_end(J); K != KE; ++K) {
assert(K->StackOffset < 1<<16 &&
"GC root stack offset is outside of fixed stack frame and out "
"of range for ocaml GC!");
AP.EmitInt32(K->StackOffset);
if (K->StackOffset >= 1<<16) {
// Very rude!
report_fatal_error(
"GC root stack offset is outside of fixed stack frame and out "
"of range for ocaml GC!");
}
AP.EmitInt16(K->StackOffset);
}
AP.EmitAlignment(IntPtrSize == 4 ? 2 : 3);