NIns* Assembler::genPrologue(RegisterMask needSaving)
{
/**
* Prologue
*/
// NJ_RESV_OFFSET is space at the top of the stack for us
// to use for parameter passing (8 bytes at the moment)
uint32_t stackNeeded = 4 * _activation.highwatermark + NJ_STACK_OFFSET;
uint32_t savingCount = 0;
uint32_t savingMask = 0;
#if defined(NJ_THUMB_JIT)
savingCount = 5; // R4-R7, LR
savingMask = 0xF0;
(void)needSaving;
#else
savingCount = 9; //R4-R10,R11,LR
savingMask = SavedRegs | rmask(FRAME_PTR);
(void)needSaving;
#endif
// so for alignment purposes we've pushed return addr, fp, and savingCount registers
uint32_t stackPushed = 4 * (2+savingCount);
uint32_t aligned = alignUp(stackNeeded + stackPushed, NJ_ALIGN_STACK);
int32_t amt = aligned - stackPushed;
// Make room on stack for what we are doing
if (amt)
#ifdef NJ_THUMB_JIT
{
// largest value is 508 (7-bits << 2)
if (amt>508)
{
int size = 508;
while (size>0)
{
SUBi(SP, size);
amt -= size;
size = amt;
if (size>508)
size=508;
}
}
else
SUBi(SP, amt);
}
#else
{
SUBi(SP, amt);
}
#endif
verbose_only( verbose_outputf(" %p:",_nIns); )
NIns* Assembler::genPrologue(RegisterMask needSaving)
{
/**
* Prologue
*/
uint32_t stackNeeded = STACK_GRANULARITY * _activation.highwatermark;
uint32_t savingCount = 0;
for(Register i=FirstReg; i <= LastReg; i = nextreg(i))
if (needSaving&rmask(i))
savingCount++;
// After forcing alignment, we've pushed the pre-alignment SP
// and savingCount registers.
uint32_t stackPushed = STACK_GRANULARITY * (1+savingCount);
uint32_t aligned = alignUp(stackNeeded + stackPushed, NJ_ALIGN_STACK);
uint32_t amt = aligned - stackPushed;
// Reserve stackNeeded bytes, padded
// to preserve NJ_ALIGN_STACK-byte alignment.
if (amt)
{
#if defined NANOJIT_IA32
SUBi(SP, amt);
#elif defined NANOJIT_AMD64
SUBQi(SP, amt);
#endif
}
verbose_only( verbose_outputf(" %p:",_nIns); )
int unaryMinusCodegen(c_tree tree, int *registerNo, int topLevel,
int getAddress, const char *breakLabel, const char *continueLabel)
{
c_tree op = TREE_EXPR_OPERAND(tree,0);
if (!topLevel)
{
int zeroReg = (*registerNo)++;
SET(zeroReg, 0, "unary minus getting zero into register", NULL);
if (TREE_CODE(op) == TREE_INTEGER_CST)
{
SUBi(*registerNo, zeroReg, INTEGER_CST(op)->val,
"unary minus sub the integer const from zero", NULL);
}
else
{
int opRegister = c_codegen_recurse(op, registerNo, FALSE,
getAddress, breakLabel, continueLabel);
SUB(*registerNo, zeroReg, opRegister,
"unary minus sub the register from zero", NULL);
}
return (*registerNo)++;
}
else
{
c_codegen_recurse(op, registerNo, topLevel, getAddress, breakLabel,
continueLabel);
return *registerNo;
}
}
int comparisonExprCodegen(c_tree tree, int *registerNo, int topLevel,
condition cond, int getAddress, const char *breakLabel,
const char *continueLabel)
{
static int labelNo = 0;
static char labelPrefix[] = "COMP";
char labelArray[LABEL_ARRAY_LENGTH];
c_tree op1 = TREE_EXPR_OPERAND(tree,0);
c_tree op2 = TREE_EXPR_OPERAND(tree,1);
if (!topLevel)
{
int resultReg = (*registerNo)++;
// intially set the result to false
SET(resultReg, TRUE,
"comparison expression result register intial value true", NULL);
int op1Register = c_codegen_recurse(op1, registerNo, topLevel,
getAddress, breakLabel, continueLabel);
int subResultReg = (*registerNo)++;
if (TREE_CODE(op2) == TREE_INTEGER_CST)
{
// substract the two values to be compared
SUBi(subResultReg, op1Register, INTEGER_CST(op2)->val,
"comparison expression subtract c=a-b", NULL);
}
else
{
// substract the two values to be compared
int op2Register = c_codegen_recurse(op2, registerNo, topLevel,
getAddress, breakLabel, continueLabel);
SUB(subResultReg, op1Register, op2Register,
"comparison expression subtract c=a-b", NULL);
}
sprintf(labelArray, "%s%d", labelPrefix, labelNo++);
// create a branch depending upon the condition
checkConditionAndBranch(cond, subResultReg, labelArray,
"comparison expression branch on condition", NULL);
// this set will be skipped depending on condition
// this set sets the result to false
SET(resultReg, FALSE, "comparison expression false value", NULL);
//NOP just to create the label
NOP("comparison expression just to create a label", labelArray);
return resultReg;
}
else
{
// evaluate the LHS and RHS....but dont do the operation
c_codegen_recurse(op1, registerNo, topLevel, getAddress, breakLabel,
continueLabel);
c_codegen_recurse(op2, registerNo, topLevel, getAddress, breakLabel,
continueLabel);
return *registerNo;
}
}
int assignExprCodegen(c_tree tree, int *registerNo, int topLevel,
int getAddress, const char *breakLabel, const char *continueLabel)
{
c_tree rhs = TREE_EXPR_OPERAND(tree,1);
c_tree lhs = TREE_EXPR_OPERAND(tree,0);
if (TREE_CODE(lhs) == TREE_DECL && (strcmp(DECL_NAME_STRING(lhs), COUT)
== 0))
{
int rhsValue = c_codegen_recurse(rhs, registerNo, FALSE, FALSE,
breakLabel, continueLabel);
ADDi(R0, rhsValue, 0, "copying into R0", NULL);
COUTASM("Displaying to COUT", "");
return R0;
}
else
{
c_tree type = get_type_for_uid(TYPE(TREE_TYPE(lhs))->uid);
int typeSize = getSize(TREE_TYPE(lhs));
if(TYPE(type)->code!=STRUCT_TYPE || typeSize==1 )
{
int rhsValue = c_codegen_recurse(rhs, registerNo, FALSE, FALSE,
breakLabel, continueLabel);
int lhsAddress = c_codegen_recurse(lhs, registerNo, FALSE, TRUE,
breakLabel, continueLabel);
STRi(rhsValue, lhsAddress, 0, "assignment", NULL);
}
else
{
int rhsAddress = c_codegen_recurse(rhs, registerNo, FALSE, TRUE,
breakLabel, continueLabel);
int lhsAddress = c_codegen_recurse(lhs, registerNo, FALSE, TRUE,
breakLabel, continueLabel);
static int copyCondLabelNo = 0;
static char copyCondLabelPrefix[] = "SCC";
char copyCondLabelArray[LABEL_ARRAY_LENGTH];
static int copyEndLabelNo = 0;
static char copyEndLabelPrefix[] = "SCE";
char copyEndLabelArray[LABEL_ARRAY_LENGTH];
sprintf(copyCondLabelArray, "%s%d", copyCondLabelPrefix,
copyCondLabelNo++);
sprintf(copyEndLabelArray, "%s%d", copyEndLabelPrefix,
copyEndLabelNo++);
int counterRegister = (*registerNo)++;
int subResultRegister = (*registerNo)++;
int tempCopyRegister = (*registerNo)++;
// loop for copying
SET(counterRegister, 0, "struct copy counter initial value", NULL);
SUBi(subResultRegister, counterRegister, typeSize,
"struct copy condition to end copying", copyCondLabelArray);
BRnzp(subResultRegister, copyEndLabelArray,
"struct copy branch to end", NULL, "z");
LDR(tempCopyRegister, rhsAddress, counterRegister, "struct assignment", NULL);
STR(tempCopyRegister, lhsAddress, counterRegister, "struct assignment", NULL);
ADDi(counterRegister, counterRegister, 1, "struct copy increment counter", NULL);
BRA(copyCondLabelArray, "struct copy branch to condition", NULL);
NOP("end of struct copying", copyEndLabelArray);
}
return c_codegen_recurse(lhs, registerNo,
topLevel, getAddress, breakLabel, continueLabel);
}
}
