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108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
//
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// m3_emit.c
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//
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// Created by Steven Massey on 7/9/19.
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// Copyright © 2019 Steven Massey. All rights reserved.
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//
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#include "m3_env.h"
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#include "m3_emit.h"
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#include "m3_info.h"
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#include "m3_exec.h"
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M3Result EnsureCodePageNumLines (IM3Compilation o, u32 i_numLines)
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{
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M3Result result = m3Err_none;
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i_numLines += 2; // room for Bridge
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if (NumFreeLines (o->page) < i_numLines)
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{
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IM3CodePage page = AcquireCodePageWithCapacity (o->runtime, i_numLines);
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if (page)
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{
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m3log (emit, "bridging new code page from: %d %p (free slots: %d) to: %d", o->page->info.sequence, GetPC (o), NumFreeLines (o->page), page->info.sequence);
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d_m3Assert (NumFreeLines (o->page) >= 2);
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EmitWord (o->page, op_Branch);
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EmitWord (o->page, GetPagePC (page));
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ReleaseCodePage (o->runtime, o->page);
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o->page = page;
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}
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else result = m3Err_mallocFailedCodePage;
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}
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return result;
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}
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// have execution jump to a new page if slots are critically low
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M3Result BridgeToNewPageIfNecessary (IM3Compilation o)
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{
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return EnsureCodePageNumLines (o, d_m3CodePageFreeLinesThreshold);
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}
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M3Result EmitOp (IM3Compilation o, IM3Operation i_operation)
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{
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M3Result result = m3Err_none; d_m3Assert (i_operation or IsStackPolymorphic(o));
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// it's OK for page to be null; when compile-walking the bytecode without emitting
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if (o->page)
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{
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# if d_m3EnableOpTracing
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if (i_operation != op_DumpStack)
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# endif
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o->numEmits++;
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result = BridgeToNewPageIfNecessary (o);
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if (not result)
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{ if (d_m3LogEmit) log_emit (o, i_operation);
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# if d_m3RecordBacktraces
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EmitMappingEntry (o->page, o->lastOpcodeStart - o->module->wasmStart);
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# endif // d_m3RecordBacktraces
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EmitWord (o->page, i_operation);
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}
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}
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return result;
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}
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// Push an immediate constant into the M3 codestream
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void EmitConstant32 (IM3Compilation o, const u32 i_immediate)
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{
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if (o->page)
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EmitWord32 (o->page, i_immediate);
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}
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void EmitSlotOffset (IM3Compilation o, const i32 i_offset)
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{
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if (o->page)
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EmitWord32 (o->page, i_offset);
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}
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void EmitPointer (IM3Compilation o, const void * const i_pointer)
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{
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if (o->page)
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EmitWord (o->page, i_pointer);
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}
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void * ReservePointer (IM3Compilation o)
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{
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pc_t ptr = GetPagePC (o->page);
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EmitPointer (o, NULL);
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return (void *) ptr;
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}
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pc_t GetPC (IM3Compilation o)
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{
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return GetPagePC (o->page);
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}
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