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JumpTable support! What this represents is working asm and jit support for

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x86 and ppc for 100% dense switch statements when relocations are non-PIC.
This support will be extended and enhanced in the coming days to support
PIC, and less dense forms of jump tables.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27947 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman
2006-04-22 18:53:45 +00:00
parent 1900c012f5
commit 37efe67645
40 changed files with 717 additions and 77 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/CodeGen/AsmPrinter.cpp
+38
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@@ -17,6 +17,7 @@
#include "llvm/Constants.h"
#include "llvm/Module.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Target/TargetMachine.h"
@@ -46,6 +47,7 @@ AsmPrinter::AsmPrinter(std::ostream &o, TargetMachine &tm)
AlignmentIsInBytes(true),
SwitchToSectionDirective("\t.section\t"),
ConstantPoolSection("\t.section .rodata\n"),
JumpTableSection("\t.section .rodata\n"),
StaticCtorsSection("\t.section .ctors,\"aw\",@progbits"),
StaticDtorsSection("\t.section .dtors,\"aw\",@progbits"),
LCOMMDirective(0),
@@ -127,6 +129,33 @@ void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
}
}
/// EmitJumpTableInfo - Print assembly representations of the jump tables used
/// by the current function to the current output stream.
///
void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI) {
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
if (JT.empty()) return;
const TargetData &TD = TM.getTargetData();
// FIXME: someday we need to handle PIC jump tables
assert((TM.getRelocationModel() == Reloc::Static ||
TM.getRelocationModel() == Reloc::DynamicNoPIC) &&
"Unhandled relocation model emitting jump table information!");
SwitchSection(JumpTableSection, 0);
EmitAlignment(Log2_32(TD.getPointerAlignment()));
for (unsigned i = 0, e = JT.size(); i != e; ++i) {
O << PrivateGlobalPrefix << "JTI" << getFunctionNumber() << '_' << i
<< ":\n";
const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
O << Data32bitsDirective << ' ';
printBasicBlockLabel(JTBBs[ii]);
O << '\n';
}
}
}
/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
/// special global used by LLVM. If so, emit it and return true, otherwise
/// do nothing and return false.
@@ -654,3 +683,12 @@ bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
// Target doesn't support this yet!
return true;
}
/// printBasicBlockLabel - This method prints the label for the specified
/// MachineBasicBlock
void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB) const {
O << PrivateGlobalPrefix << "LBB"
<< Mang->getValueName(MBB->getParent()->getFunction())
<< "_" << MBB->getNumber() << '\t' << CommentString
<< MBB->getBasicBlock()->getName();
}