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operands.c
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operands.c
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// $Id: operands.c,v 1.11 2004/02/02 00:13:46 iain Exp $
#include "git.h"
#include <assert.h>
git_uint32 parseLoad (git_uint32 * pc, LoadReg reg, int mode, TransferSize size, git_sint32 * constVal)
{
git_uint32 value;
switch (mode)
{
case 0x0: // Constant zero. (Zero bytes)
value = 0;
goto load_const;
case 0x1: // Constant, -80 to 7F. (One byte)
value = (git_sint32) ((git_sint8) memRead8(*pc));
*pc += 1;
goto load_const;
case 0x2: // Constant, -8000 to 7FFF. (Two bytes)
value = (git_sint32) ((git_sint16) memRead16(*pc));
*pc += 2;
goto load_const;
case 0x3: // Constant, any value. (Four bytes)
value = memRead32(*pc);
*pc += 4;
goto load_const;
case 0x5: // Contents of address 00 to FF. (One byte)
value = memRead8(*pc);
*pc += 1;
goto load_addr;
case 0x6: // Contents of address 0000 to FFFF. (Two bytes)
value = memRead16(*pc);
*pc += 2;
goto load_addr;
case 0x7: // Contents of any address. (Four bytes)
value = memRead32(*pc);
*pc += 4;
goto load_addr;
case 0x8: // Value popped off stack. (Zero bytes)
goto load_stack;
case 0x9: // Call frame local at address 00 to FF. (One byte)
value = memRead8(*pc);
*pc += 1;
goto load_local;
case 0xA: // Call frame local at address 0000 to FFFF. (Two bytes)
value = memRead16(*pc);
*pc += 2;
goto load_local;
case 0xB: // Call frame local at any address. (Four bytes)
value = memRead32(*pc);
*pc += 4;
goto load_local;
case 0xD: // Contents of RAM address 00 to FF. (One byte)
value = memRead8(*pc) + gRamStart;
*pc += 1;
goto load_addr;
case 0xE: // Contents of RAM address 0000 to FFFF. (Two bytes)
value = memRead16(*pc) + gRamStart;
*pc += 2;
goto load_addr;
case 0xF: // Contents of RAM, any address. (Four bytes)
value = memRead32(*pc) + gRamStart;
*pc += 4;
goto load_addr;
default: // Illegal addressing mode
abortCompilation();
break;
// ------------------------------------------------------
load_const:
if (constVal)
{
*constVal = value;
return 1;
}
else
{
emitCode (label_L1_const + reg);
emitData (value);
}
break;
load_stack:
emitCode (label_L1_stack + reg);
break;
load_addr:
if (value < gRamStart)
{
if (size == size32)
value = memRead32(value);
else if (size == size16)
value = memRead16(value);
else
value = memRead8(value);
goto load_const;
}
switch (size)
{
case size8:
assert (reg == reg_L1);
emitCode (label_L1_addr8);
break;
case size16:
assert (reg == reg_L1);
emitCode (label_L1_addr16);
break;
case size32:
emitCode (label_L1_addr + reg);
break;
}
emitData (value);
break;
load_local:
emitCode (label_L1_local + reg);
emitData (value / 4); // Convert byte offset to word offset.
break;
}
return 0;
}
void parseStore (git_uint32 * pc, StoreReg reg, int mode, TransferSize size)
{
git_uint32 value;
switch (mode)
{
case 0x0: // Discard
break;
case 0x5: // Contents of address 00 to FF. (One byte)
value = memRead8(*pc);
*pc += 1;
goto store_addr;
case 0x6: // Contents of address 0000 to FFFF. (Two bytes)
value = memRead16(*pc);
*pc += 2;
goto store_addr;
case 0x7: // Contents of any address. (Four bytes)
value = memRead32(*pc);
*pc += 4;
goto store_addr;
case 0x8: // Value popped off stack. (Zero bytes)
goto store_stack;
case 0x9: // Call frame local at store_address 00 to FF. (One byte)
value = memRead8(*pc);
*pc += 1;
goto store_local;
case 0xA: // Call frame local at store_address 0000 to FFFF. (Two bytes)
value = memRead16(*pc);
*pc += 2;
goto store_local;
case 0xB: // Call frame local at any store_address. (Four bytes)
value = memRead32(*pc);
*pc += 4;
goto store_local;
case 0xD: // Contents of RAM address 00 to FF. (One byte)
value = memRead8(*pc) + gRamStart;
*pc += 1;
goto store_addr;
case 0xE: // Contents of RAM address 0000 to FFFF. (Two bytes)
value = memRead16(*pc) + gRamStart;
*pc += 2;
goto store_addr;
case 0xF: // Contents of RAM, any address. (Four bytes)
value = memRead32(*pc) + gRamStart;
*pc += 4;
goto store_addr;
// ------------------------------------------------------
store_stack:
emitCode (reg == reg_S1 ? label_S1_stack : label_S2_stack);
break;
store_addr:
if (size == size32)
{
emitCode (reg == reg_S1 ? label_S1_addr : label_S2_addr);
}
else
{
assert (reg == reg_S1);
emitCode (size == size16 ? label_S1_addr16 : label_S1_addr8);
}
emitData (value);
break;
store_local:
emitCode (reg == reg_S1 ? label_S1_local : label_S2_local);
emitData (value / 4); // Convert byte offset to word offset.
break;
}
}
static void parseStub (git_uint32 * pc, int mode, Label discardOp)
{
git_uint32 value;
switch (mode)
{
case 0x0: // Discard
goto store_discard;
case 0x5: // Contents of address 00 to FF. (One byte)
value = memRead8(*pc);
*pc += 1;
goto store_addr;
case 0x6: // Contents of address 0000 to FFFF. (Two bytes)
value = memRead16(*pc);
*pc += 2;
goto store_addr;
case 0x7: // Contents of any address. (Four bytes)
value = memRead32(*pc);
*pc += 4;
goto store_addr;
case 0x8: // Value popped off stack. (Zero bytes)
goto store_stack;
case 0x9: // Call frame local at store_address 00 to FF. (One byte)
value = memRead8(*pc);
*pc += 1;
goto store_local;
case 0xA: // Call frame local at store_address 0000 to FFFF. (Two bytes)
value = memRead16(*pc);
*pc += 2;
goto store_local;
case 0xB: // Call frame local at any store_address. (Four bytes)
value = memRead32(*pc);
*pc += 4;
goto store_local;
case 0xD: // Contents of RAM address 00 to FF. (One byte)
value = memRead8(*pc) + gRamStart;
*pc += 1;
goto store_addr;
case 0xE: // Contents of RAM address 0000 to FFFF. (Two bytes)
value = memRead16(*pc) + gRamStart;
*pc += 2;
goto store_addr;
case 0xF: // Contents of RAM, any address. (Four bytes)
value = memRead32(*pc) + gRamStart;
*pc += 4;
goto store_addr;
// ------------------------------------------------------
store_discard:
emitCode (discardOp);
break;
store_stack:
emitCode (discardOp + (label_call_stub_stack - label_call_stub_discard));
break;
store_addr:
emitCode (discardOp + (label_call_stub_addr - label_call_stub_discard));
emitData (value);
break;
store_local:
emitCode (discardOp + (label_call_stub_local - label_call_stub_discard));
emitData (value);
break;
}
// Every call stub ends with the glulx return address.
emitData (*pc);
// ...which means that every call stub references the next instruction.
nextInstructionIsReferenced ();
}
void parseCallStub (git_uint32 * pc, int mode)
{
parseStub (pc, mode, label_call_stub_discard);
}
void parseSaveStub (git_uint32 * pc, int mode)
{
parseStub (pc, mode, label_save_stub_discard);
}
void parseUndoStub (git_uint32 * pc, int mode)
{
parseStub (pc, mode, label_undo_stub_discard);
}
void parseCatchStub (git_uint32 * pc, int * modes)
{
git_uint32 tokenVal;
git_sint32 branchVal;
git_uint32 branchConst = 0;
Block stubCode;
switch (modes[0])
{
case 0x0: // Discard
goto store_discard;
case 0x5: // Contents of address 00 to FF. (One byte)
tokenVal = memRead8(*pc);
*pc += 1;
goto store_addr;
case 0x6: // Contents of address 0000 to FFFF. (Two bytes)
tokenVal = memRead16(*pc);
*pc += 2;
goto store_addr;
case 0x7: // Contents of any address. (Four bytes)
tokenVal = memRead32(*pc);
*pc += 4;
goto store_addr;
case 0x8: // Value popped off stack. (Zero bytes)
goto store_stack;
case 0x9: // Call frame local at store_address 00 to FF. (One byte)
tokenVal = memRead8(*pc);
*pc += 1;
goto store_local;
case 0xA: // Call frame local at store_address 0000 to FFFF. (Two bytes)
tokenVal = memRead16(*pc);
*pc += 2;
goto store_local;
case 0xB: // Call frame local at any store_address. (Four bytes)
tokenVal = memRead32(*pc);
*pc += 4;
goto store_local;
case 0xD: // Contents of RAM address 00 to FF. (One byte)
tokenVal = memRead8(*pc) + gRamStart;
*pc += 1;
goto store_addr;
case 0xE: // Contents of RAM address 0000 to FFFF. (Two bytes)
tokenVal = memRead16(*pc) + gRamStart;
*pc += 2;
goto store_addr;
case 0xF: // Contents of RAM, any address. (Four bytes)
tokenVal = memRead32(*pc) + gRamStart;
*pc += 4;
goto store_addr;
// ------------------------------------------------------
store_discard:
branchConst = parseLoad (pc, reg_L1, modes[1], size32, &branchVal);
emitCode (label_catch_stub_discard);
break;
store_stack:
branchConst = parseLoad (pc, reg_L1, modes[1], size32, &branchVal);
emitCode (label_catch_stub_stack);
break;
store_addr:
branchConst = parseLoad (pc, reg_L1, modes[1], size32, &branchVal);
emitCode (label_catch_stub_addr);
emitData (tokenVal);
break;
store_local:
branchConst = parseLoad (pc, reg_L1, modes[1], size32, &branchVal);
emitCode (label_catch_stub_local);
emitData (tokenVal);
break;
}
// The catch stub ends with the address to go to on throw,
// which is after the branch, so we don't know what it is yet.
emitData (0);
stubCode = peekAtEmittedStuff (1);
// Emit the branch taken after storing the catch token.
if (branchConst)
{
if (branchVal == 0)
emitCode (label_jump_return0);
else if (branchVal == 1)
emitCode (label_jump_return1);
else
emitConstBranch (label_jump_const, *pc + branchVal - 2);
}
else
{
emitCode (label_jump_var);
emitData (*pc);
}
// Fix up the throw return address
*stubCode = *pc;
nextInstructionIsReferenced ();
}