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#include "stdafx.h"
#include "PosixOutput.h"
#include "Gc/DwarfTable.h"
#include "Code/Binary.h"
#include "Code/Dwarf/Stream.h"
#include "Code/Dwarf/FunctionInfo.h"
#include "DwarfRegisters.h"
#include "Utils/Bitwise.h"
namespace code {
namespace x64 {
const Nat posixCodeAlignment = 1;
const Int posixDataAlignment = -8;
void initCIE(CIE *cie) {
Nat pos = code::dwarf::initStormCIE(cie, posixCodeAlignment, posixDataAlignment, DW_REG_RA);
code::dwarf::DStream out(cie->data, CIE_DATA, pos);
// All functions in x86 start with the return pointer pushed on the stack. We emit that
// once and for all in the CIE record:
out.putUOp(DW_CFA_def_cfa, DW_REG_RSP, 8); // def_cfa rsp, 8
out.putUOp(DW_CFA_offset + DW_REG_RA, 1); // offset ra, saved at cfa-8
assert(!out.overflow(), L"Increase CIE_DATA!");
}
PosixCodeOut::PosixCodeOut(Binary *owner, Array<Nat> *lbls, Nat size, Nat numRefs) {
// Properly align 'size'.
this->size = size = roundUp(size, Nat(sizeof(void *)));
// Initialize our members.
this->owner = owner;
codeRefs = new (this) Array<TObject *>();
code = (byte *)runtime::allocCode(engine(), size, numRefs + 3);
labels = lbls;
pos = 0;
ref = 3;
GcCode *refs = runtime::codeRefs(code);
// Store a reference to the binary in the first element of the blob.
refs->refs[0].offset = 0;
refs->refs[0].kind = GcCodeRef::ptrStorage;
refs->refs[0].pointer = owner;
// Store 'codeRefs' also. We need to keep it alive.
refs->refs[1].offset = 0;
refs->refs[1].kind = GcCodeRef::ptrStorage;
refs->refs[1].pointer = codeRefs;
// An entry for the DWARF unwinding information.
FDE *unwind = dwarfTable().alloc(code, &initCIE);
fnInfo.set(unwind, posixCodeAlignment, posixDataAlignment, true, &dwarfRegister);
refs->refs[2].offset = 0;
refs->refs[2].kind = GcCodeRef::dwarfInfo;
refs->refs[2].pointer = unwind;
}
#ifndef DEBUG
#undef assert
#define assert(...)
#endif
void PosixCodeOut::putByte(Byte b) {
assert(pos < size);
code[pos++] = b;
}
void PosixCodeOut::putInt(Nat w) {
assert(pos + 3 < size);
Nat *to = (Nat *)&code[pos];
*to = w;
pos += 4;
}
void PosixCodeOut::putLong(Word w) {
assert(pos + 7 < size);
Word *to = (Word *)&code[pos];
*to = w;
pos += 8;
}
void PosixCodeOut::putPtr(Word w) {
assert(pos + 7 < size);
Word *to = (Word *)&code[pos];
*to = w;
pos += 8;
}
void PosixCodeOut::align(Nat to) {
pos = roundUp(pos, to);
}
void PosixCodeOut::putGc(GcCodeRef::Kind kind, Nat size, Word w) {
GcCode *refs = runtime::codeRefs(code);
assert(ref < refs->refCount);
refs->refs[ref].offset = pos;
refs->refs[ref].kind = kind;
refs->refs[ref].pointer = (void *)w;
ref++;
// The actual contents will be updated later...
pos += size;
}
void PosixCodeOut::markGc(GcCodeRef::Kind kind, Nat size, Word w) {
GcCode *refs = runtime::codeRefs(code);
assert(ref < refs->refCount);
assert(pos >= size);
refs->refs[ref].offset = pos - size;
refs->refs[ref].kind = kind;
refs->refs[ref].pointer = (void *)w;
ref++;
}
void PosixCodeOut::putGcPtr(Word w) {
GcCode *refs = runtime::codeRefs(code);
assert(ref < refs->refCount);
refs->refs[ref].offset = pos;
refs->refs[ref].kind = GcCodeRef::rawPtr;
refs->refs[ref].pointer = (void *)w;
ref++;
putPtr(w);
}
void PosixCodeOut::putGcRelative(Word w) {
GcCode *refs = runtime::codeRefs(code);
assert(ref < refs->refCount);
refs->refs[ref].offset = pos;
refs->refs[ref].kind = GcCodeRef::relativePtr;
refs->refs[ref].pointer = (void *)w;
ref++;
putPtr(0); // Will be updated later...
}
void PosixCodeOut::putRelativeStatic(Word w) {
GcCode *refs = runtime::codeRefs(code);
assert(ref < refs->refCount);
refs->refs[ref].offset = pos;
refs->refs[ref].kind = GcCodeRef::relative;
refs->refs[ref].pointer = (void *)w;
ref++;
putPtr(0); // Will be updated later.
}
void PosixCodeOut::putPtrSelf(Word w) {
GcCode *refs = runtime::codeRefs(code);
assert(ref < refs->refCount);
refs->refs[ref].offset = pos;
refs->refs[ref].kind = GcCodeRef::inside;
refs->refs[ref].pointer = (void *)(w - Word(codePtr()));
ref++;
putPtr(w);
}
Nat PosixCodeOut::tell() const {
return pos;
}
void *PosixCodeOut::codePtr() const {
return code;
}
void PosixCodeOut::markLabel(Nat id) {
// No need. This should already be done for us.
}
void PosixCodeOut::markGcRef(Ref r) {
if (ref == 0)
return;
codeRefs->push(new (this) CodeUpdater(r, owner, code, ref - 1));
}
void PosixCodeOut::markRef(OffsetRef r, Nat ptr) {
Nat p = pos;
if (ptr)
p -= sizeof(size_t);
else
p -= sizeof(Nat);
codeRefs->push(new (this) CodeOffsetUpdater(r, owner, code, p, ptr));
}
Nat PosixCodeOut::labelOffset(Nat id) {
if (id < labels->count()) {
return labels->at(id);
} else {
assert(false, L"Unknown label id: " + ::toS(id));
return 0;
}
}
Nat PosixCodeOut::toRelative(Nat offset) {
return offset - (pos + 4); // NOTE: All relative things on the X86-64 are 4 bytes long, not 8!
}
}
}
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