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Factor some code out and support for Jump Table relocations

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74760 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes
2009-07-03 04:36:26 +00:00
parent 2373c99433
commit 0b1308f189
4 changed files with 142 additions and 42 deletions
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31
lib/CodeGen/ELFCodeEmitter.h
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@@ -40,6 +40,10 @@ namespace llvm {
/// containing the constant pool entry for that index.
std::vector<unsigned> CPSections;
/// JTLocations - This is a map of jump table indices to offsets from the
/// start of the section for that jump table index.
std::vector<uintptr_t> JTLocations;
/// MBBLocations - This vector is a mapping from MBB ID's to their address.
/// It is filled in by the StartMachineBasicBlock callback and queried by
/// the getMachineBasicBlockAddress callback.
@@ -48,8 +52,12 @@ namespace llvm {
/// FnStartPtr - Pointer to the start location of the current function
/// in the buffer
uint8_t *FnStartPtr;
/// JumpTableSectionIdx - Holds the index of the Jump Table Section
unsigned JumpTableSectionIdx;
public:
explicit ELFCodeEmitter(ELFWriter &ew) : EW(ew), TM(EW.TM) {}
explicit ELFCodeEmitter(ELFWriter &ew) : EW(ew), TM(EW.TM),
JumpTableSectionIdx(0) {}
void startFunction(MachineFunction &F);
bool finishFunction(MachineFunction &F);
@@ -64,25 +72,20 @@ namespace llvm {
MBBLocations[MBB->getNumber()] = getCurrentPCOffset();
}
virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) {
assert(MBBLocations.size() > (unsigned)MBB->getNumber() &&
MBBLocations[MBB->getNumber()] && "MBB not emitted!");
return MBBLocations[MBB->getNumber()];
}
virtual uintptr_t getConstantPoolEntryAddress(unsigned Index) const {
assert(CPLocations.size() > Index && "CP not emitted!");
return CPLocations[Index];
}
virtual uintptr_t getJumpTableEntryAddress(unsigned Index) const {
assert(0 && "JT not implementated yet!");
return 0;
assert(JTLocations.size() > Index && "JT not emitted!");
return JTLocations[Index];
}
virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const {
assert(0 && "JT not implementated yet!");
return 0;
assert(MBBLocations.size() > (unsigned)MBB->getNumber() &&
MBBLocations[MBB->getNumber()] && "MBB not emitted!");
return MBBLocations[MBB->getNumber()];
}
virtual uintptr_t getLabelAddress(uint64_t Label) const {
@@ -100,7 +103,11 @@ namespace llvm {
/// the constant should live in and emit the constant.
void emitConstantPool(MachineConstantPool *MCP);
virtual void setModuleInfo(llvm::MachineModuleInfo* MMI) { }
/// emitJumpTables - Emit all the jump tables for a given jump table info
/// record to the appropriate section.
void emitJumpTables(MachineJumpTableInfo *MJTI);
virtual void setModuleInfo(llvm::MachineModuleInfo* MMI) {}
/// JIT SPECIFIC FUNCTIONS - DO NOT IMPLEMENT THESE HERE!
void startGVStub(const GlobalValue* F, unsigned StubSize,