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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//*****************************************************************************
// CeeFileGenWriterTokens.cpp
//
// This code will walk the byte codes for all methods before they are saved
// to disk and apply the token fix-ups if they have moved.
//
//*****************************************************************************
#include "stdafx.h"
#include "ceegen.h"
#ifndef FEATURE_CORECLR
#define DECLARE_DATA
#endif
#include "../../ildasm/dasmenum.hpp"
#define MAX_CLASSNAME_LENGTH 1024
//********** Locals. **********************************************************
OPCODE DecodeOpcode(const BYTE *pCode, DWORD *pdwLen);
//********** Code. ************************************************************
//*****************************************************************************
// Method bodies are kept in the text section. The meta data contains the
// RVA of each method body in the image. The TextSection object contains the
// actual raw bytes where the method bodies are located. This code will
// determine the raw offset of each method based on the RVA kept in the meta
// data.
//*****************************************************************************
HRESULT CeeFileGenWriter::MapTokens(
CeeGenTokenMapper *pMapper,
IMetaDataImport *pImport)
{
mdTypeDef td;
mdMethodDef md;
ULONG count;
ULONG MethodRVA;
ULONG codeOffset;
ULONG BaseRVA;
DWORD dwFlags;
DWORD iFlags;
HCORENUM hTypeDefs = 0, hEnum = 0;
WCHAR rcwName[MAX_CLASSNAME_LENGTH];
HRESULT hr;
CeeSection TextSection = getTextSection();
// Ask for the base RVA of the first method in the stream. All other
// method RVA's are >= that value, and will give us the raw offset required.
hr = getMethodRVA(0, &BaseRVA);
_ASSERTE(SUCCEEDED(hr));
// do globals first
while ((hr = pImport->EnumMethods(&hEnum, mdTokenNil, &md, 1, &count)) == S_OK)
{
hr = pImport->GetMethodProps(md, NULL,
rcwName, lengthof(rcwName), NULL,
&dwFlags, NULL, NULL,
&MethodRVA, &iFlags);
_ASSERTE(SUCCEEDED(hr));
if (MethodRVA == 0 || ((IsMdAbstract(dwFlags) || IsMiInternalCall(iFlags)) ||
(! IsMiIL(iFlags) && ! IsMiOPTIL(iFlags))))
continue;
// The raw offset of the method is the RVA in the image minus
// the first method in the text section.
codeOffset = MethodRVA - BaseRVA;
hr = MapTokensForMethod(pMapper,
(BYTE *) TextSection.computePointer(codeOffset),
rcwName);
if (FAILED(hr))
goto ErrExit;
}
if (hEnum) pImport->CloseEnum(hEnum);
hEnum = 0;
while ((hr = pImport->EnumTypeDefs(&hTypeDefs, &td, 1, &count)) == S_OK)
{
while ((hr = pImport->EnumMethods(&hEnum, td, &md, 1, &count)) == S_OK)
{
hr = pImport->GetMethodProps(md, NULL,
rcwName, lengthof(rcwName), NULL,
&dwFlags, NULL, NULL,
&MethodRVA, &iFlags);
_ASSERTE(SUCCEEDED(hr));
if (MethodRVA == 0 || ((IsMdAbstract(dwFlags) || IsMiInternalCall(iFlags)) ||
(! IsMiIL(iFlags) && ! IsMiOPTIL(iFlags))))
continue;
// The raw offset of the method is the RVA in the image minus
// the first method in the text section.
codeOffset = MethodRVA - BaseRVA;
hr = MapTokensForMethod(pMapper,
(BYTE *) TextSection.computePointer(codeOffset),
rcwName);
if (FAILED(hr))
goto ErrExit;
}
if (hEnum) pImport->CloseEnum(hEnum);
hEnum = 0;
}
ErrExit:
if (hTypeDefs) pImport->CloseEnum(hTypeDefs);
if (hEnum) pImport->CloseEnum(hEnum);
return (hr);
}
//*****************************************************************************
// This method will walk the byte codes of an IL method looking for tokens.
// For each token found, it will check to see if it has been moved, and if
// so, apply the new token value in its place.
//*****************************************************************************
HRESULT CeeFileGenWriter::MapTokensForMethod(
CeeGenTokenMapper *pMapper,
BYTE *pCode,
LPCWSTR szMethodName)
{
mdToken tkTo;
DWORD PC;
COR_ILMETHOD_DECODER method((COR_ILMETHOD*) pCode);
// If compressed IL is being emitted, this routine will have no idea how to walk the tokens,
// so don't do it
if (m_dwMacroDefinitionSize != 0)
return S_OK;
pCode = const_cast<BYTE*>(method.Code);
PC = 0;
while (PC < method.GetCodeSize())
{
DWORD Len;
DWORD i;
OPCODE instr;
instr = DecodeOpcode(&pCode[PC], &Len);
if (instr == CEE_COUNT)
{
_ASSERTE(0 && "Instruction decoding error\n");
return E_FAIL;
}
PC += Len;
switch (OpcodeInfo[instr].Type)
{
DWORD tk;
default:
{
_ASSERTE(0 && "Unknown instruction\n");
return E_FAIL;
}
case InlineNone:
break;
case ShortInlineI:
case ShortInlineVar:
case ShortInlineBrTarget:
PC++;
break;
case InlineVar:
PC += 2;
break;
case InlineI:
case ShortInlineR:
case InlineBrTarget:
case InlineRVA:
PC += 4;
break;
case InlineI8:
case InlineR:
PC += 8;
break;
case InlinePhi:
{
DWORD cases = pCode[PC];
PC += 2 * cases + 1;
break;
}
case InlineSwitch:
{
DWORD cases = pCode[PC] + (pCode[PC+1] << 8) + (pCode[PC+2] << 16) + (pCode[PC+3] << 24);
PC += 4;
for (i = 0; i < cases; i++)
{
PC += 4;
}
// skip bottom of loop which prints szString
continue;
}
case InlineTok:
case InlineSig:
case InlineMethod:
case InlineField:
case InlineType:
case InlineString:
{
tk = GET_UNALIGNED_VAL32(&pCode[PC]);
if (pMapper->HasTokenMoved(tk, tkTo))
{
SET_UNALIGNED_VAL32(&pCode[PC], tkTo);
}
PC += 4;
break;
}
}
}
return S_OK;
}
OPCODE DecodeOpcode(const BYTE *pCode, DWORD *pdwLen)
{
OPCODE opcode;
*pdwLen = 1;
opcode = OPCODE(pCode[0]);
switch(opcode) {
case CEE_PREFIX1:
opcode = OPCODE(pCode[1] + 256);
if (opcode < 0 || opcode >= CEE_COUNT)
opcode = CEE_COUNT;
*pdwLen = 2;
break;
case CEE_PREFIXREF:
case CEE_PREFIX2:
case CEE_PREFIX3:
case CEE_PREFIX4:
case CEE_PREFIX5:
case CEE_PREFIX6:
case CEE_PREFIX7:
*pdwLen = 3;
return CEE_COUNT;
default:
break;
}
return opcode;
}
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