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Hacking together proper stack saving. Can't get >128b frames working.

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This commit is contained in:
Ben Vanik
2014-01-31 22:16:05 -08:00
parent f85b83709e
commit 009a6d0745
14 changed files with 424 additions and 80 deletions
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29
src/alloy/backend/x64/x64_emitter.cc
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@@ -11,6 +11,7 @@
#include <alloy/backend/x64/x64_backend.h>
#include <alloy/backend/x64/x64_code_cache.h>
#include <alloy/backend/x64/x64_thunk_emitter.h>
#include <alloy/backend/x64/lowering/lowering_table.h>
#include <alloy/hir/hir_builder.h>
#include <alloy/runtime/debug_info.h>
@@ -46,7 +47,6 @@ X64Emitter::X64Emitter(X64Backend* backend, XbyakAllocator* allocator) :
}
X64Emitter::~X64Emitter() {
delete allocator_;
}
int X64Emitter::Initialize() {
@@ -71,7 +71,7 @@ int X64Emitter::Emit(
// Copy the final code to the cache and relocate it.
out_code_size = getSize();
out_code_address = Emplace(code_cache_);
out_code_address = Emplace(StackLayout::GUEST_STACK_SIZE);
// Stash source map.
if (debug_info_flags & DEBUG_INFO_SOURCE_MAP) {
@@ -83,13 +83,13 @@ int X64Emitter::Emit(
return 0;
}
void* X64Emitter::Emplace(X64CodeCache* code_cache) {
void* X64Emitter::Emplace(size_t stack_size) {
// To avoid changing xbyak, we do a switcharoo here.
// top_ points to the Xbyak buffer, and since we are in AutoGrow mode
// it has pending relocations. We copy the top_ to our buffer, swap the
// pointer, relocate, then return the original scratch pointer for use.
uint8_t* old_address = top_;
void* new_address = code_cache->PlaceCode(top_, size_);
void* new_address = code_cache_->PlaceCode(top_, size_, stack_size);
top_ = (uint8_t*)new_address;
ready();
top_ = old_address;
@@ -132,21 +132,13 @@ int X64Emitter::Emit(HIRBuilder* builder) {
// X64CodeCache, which dynamically generates exception information.
// Adding or changing anything here must be matched!
const bool emit_prolog = true;
const size_t stack_size = 72;
const size_t stack_size = StackLayout::GUEST_STACK_SIZE;
if (emit_prolog) {
mov(qword[rsp + 8], rcx);
mov(qword[rsp + 8 * 2], rdx);
mov(qword[rsp + 8 * 1], rcx);
sub(rsp, stack_size);
mov(qword[rsp + 8 * 0], rbx);
mov(qword[rsp + 8 * 1], r12);
mov(qword[rsp + 8 * 2], r13);
mov(qword[rsp + 8 * 3], r14);
mov(qword[rsp + 8 * 4], r15);
}
// membase stays in rdx. If we evict it (like on function calls) we
// must put it back.
mov(rdx, qword[rcx + 8]);
auto lowering_table = backend_->lowering_table();
reg_state_.active_regs = reg_state_.live_regs = reserved_regs;
@@ -180,12 +172,9 @@ int X64Emitter::Emit(HIRBuilder* builder) {
// Function epilog.
L("epilog");
if (emit_prolog) {
mov(rbx, qword[rsp + 8 * 0]);
mov(r12, qword[rsp + 8 * 1]);
mov(r13, qword[rsp + 8 * 2]);
mov(r14, qword[rsp + 8 * 3]);
mov(r15, qword[rsp + 8 * 4]);
add(rsp, stack_size);
mov(rcx, qword[rsp + 8 * 1]);
mov(rdx, qword[rsp + 8 * 2]);
}
ret();