6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-20 10:24:12 +00:00
Code Issues Projects Releases Wiki Activity

encode calling conventions for call/invoke instructions.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21751 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2005-05-06 22:34:01 +00:00
parent 6dc7e6833b
commit dee199fe82
2 changed files with 80 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

50
lib/Bytecode/Writer/Writer.cpp
View File

@ -19,6 +19,7 @@
#include "WriterInternals.h"
#include "llvm/Bytecode/WriteBytecodePass.h"
#include "llvm/CallingConv.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Instructions.h"
@ -425,7 +426,7 @@ void BytecodeWriter::outputConstantStrings() {
typedef unsigned char uchar;
// outputInstructionFormat0 - Output those weird instructions that have a large
// number of operands or have large operands themselves...
// number of operands or have large operands themselves.
//
// Format: [opcode] [type] [numargs] [arg0] [arg1] ... [arg<numargs-1>]
//
@ -439,7 +440,7 @@ void BytecodeWriter::outputInstructionFormat0(const Instruction *I,
unsigned NumArgs = I->getNumOperands();
output_vbr(NumArgs + (isa<CastInst>(I) || isa<VANextInst>(I) ||
isa<VAArgInst>(I)));
isa<VAArgInst>(I) || Opcode == 56 || Opcode == 58));
if (!isa<GetElementPtrInst>(&I)) {
for (unsigned i = 0; i < NumArgs; ++i) {
@ -456,8 +457,12 @@ void BytecodeWriter::outputInstructionFormat0(const Instruction *I,
int Slot = Table.getSlot(VAI->getArgType());
assert(Slot != -1 && "VarArg argument type unknown?");
output_typeid((unsigned)Slot);
} else if (Opcode == 56) { // Invoke escape sequence
output_vbr(cast<InvokeInst>(I)->getCallingConv());
} else if (Opcode == 58) { // Call escape sequence
output_vbr((cast<CallInst>(I)->getCallingConv() << 1) |
cast<CallInst>(I)->isTailCall());
}
} else {
int Slot = Table.getSlot(I->getOperand(0));
assert(Slot >= 0 && "No slot number for value!?!?");
@ -608,12 +613,31 @@ void BytecodeWriter::outputInstruction(const Instruction &I) {
// Encode 'tail call' as 61, 'volatile load' as 62, and 'volatile store' as
// 63.
if (isa<CallInst>(I) && cast<CallInst>(I).isTailCall())
Opcode = 61;
if (isa<LoadInst>(I) && cast<LoadInst>(I).isVolatile())
if (const CallInst *CI = dyn_cast<CallInst>(&I)) {
if (CI->getCallingConv() == CallingConv::C) {
if (CI->isTailCall())
Opcode = 61; // CCC + Tail Call
else
; // Opcode = Instruction::Call
} else if (CI->getCallingConv() == CallingConv::Fast) {
if (CI->isTailCall())
Opcode = 59; // FastCC + TailCall
else
Opcode = 60; // FastCC + Not Tail Call
} else {
Opcode = 58; // Call escape sequence.
}
} else if (const InvokeInst *II = dyn_cast<InvokeInst>(&I)) {
if (II->getCallingConv() == CallingConv::Fast)
Opcode = 57; // FastCC invoke.
else if (II->getCallingConv() != CallingConv::C)
Opcode = 56; // Invoke escape sequence.
} else if (isa<LoadInst>(I) && cast<LoadInst>(I).isVolatile()) {
Opcode = 62;
if (isa<StoreInst>(I) && cast<StoreInst>(I).isVolatile())
} else if (isa<StoreInst>(I) && cast<StoreInst>(I).isVolatile()) {
Opcode = 63;
}
// Figure out which type to encode with the instruction. Typically we want
// the type of the first parameter, as opposed to the type of the instruction
@ -702,6 +726,18 @@ void BytecodeWriter::outputInstruction(const Instruction &I) {
Slots[Idx] = (Slots[Idx] << 2) | IdxId;
if (Slots[Idx] > MaxOpSlot) MaxOpSlot = Slots[Idx];
}
} else if (Opcode == 58) {
// If this is the escape sequence for call, emit the tailcall/cc info.
const CallInst &CI = cast<CallInst>(I);
++NumOperands;
if (NumOperands < 3) {
Slots[NumOperands-1] = (CI.getCallingConv() << 1) | CI.isTailCall();
if (Slots[NumOperands-1] > MaxOpSlot)
MaxOpSlot = Slots[NumOperands-1];
}
} else if (Opcode == 56) {
// Invoke escape seq has at least 4 operands to encode.
++NumOperands;
}
// Decide which instruction encoding to use. This is determined primarily