71 lines
3.3 KiB
Markdown
71 lines
3.3 KiB
Markdown
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# Porting Guide v3 -> v4
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### General
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- Zydis now requires a C11 capable compiler
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- Type renamed: `ZydisAddressWidth` -> `ZydisStackWidth`
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- Enum changed: `ZydisMemoryOperandType`
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- Constants added: `ZYDIS_MEMOP_TYPE_VSIB`
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- Decoding behavior changed:
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- In case of vector SIB addressing memory operands, `ZYDIS_MEMOP_TYPE_VSIB` will be reported by the decoder instead
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of `ZYDIS_MEMOP_TYPE_MEM` (in `ZydisDecodedOperand.mem.type`)
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- Constants renamed:
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- `ZYDIS_STATIC_DEFINE` -> `ZYDIS_STATIC_BUILD`
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- `Zydis_EXPORTS` -> `ZYDIS_SHOULD_EXPORT`
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- `ZYDIS_ADDRESS_WIDTH_XXX` -> `ZYDIS_STACK_WIDTH_XXX`
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- `ZydisCPUFlagAction` got replaced by `ZydisAccessedFlagsMask`
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- `ZydisAccessedFlags` was added as a replacement for the CPU flag arrays
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- `ZYDIS_CPUFLAG_C[0-3]` were replaced with `ZYDIS_FPUFLAG_C[0-3]`
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- The segment API (`ZydisGetInstructionSegments` and corresponding types) was moved to a separate
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header file
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### Decoder
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- Added functions to decode instructions and operands individually, allowing for improved performance when the operands
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are not actually needed.
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- `ZydisDecoderDecodeInstruction`
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- `ZydisDecoderDecodeOperands`
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- `ZydisDecoderDecodeBuffer` got replaced by `ZydisDecoderDecodeFull`
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- `ZydisDecodedInstruction` struct was changed
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- Removed field `operands`
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- The `operands` array is passed to the desired decoder function as a separate argument instead
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- Added field `operand_count_visible`
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- Contains the number of visible (explicit and implicit) operands
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- The `cpu_flags_read` and `cpu_flags_written` fields are replaced with the `cpu_flags` field
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- The `fpu_flags_read` and `fpu_flags_read` fields are replaced with the `fpu_flags` field
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- The older `accessed_flags` array is replaced by the `cpu_flags` and `fpu_flags` fields
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### Formatter
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- Added arguments to accommodate the new decoder API changes
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- Arguments from `Ex` variants of various functions were integrated into the non-`Ex` variant
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- All of these varied by only a single argument and didn't warrant the additional complexity
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- As a result, the signature of the following functions changed:
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- `ZydisFormatterFormatInstruction`
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- `ZydisFormatterFormatOperand`
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- `ZydisFormatterTokenizeInstruction`
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- `ZydisFormatterTokenizeOperand`
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### Utils
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- Removed flag helpers (no longer needed with new flags format!)
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- `ZydisGetAccessedFlagsByAction`
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- `ZydisGetAccessedFlagsRead`
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- `ZydisGetAccessedFlagsWritten`
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### Changes relevant for language bindings
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- Encoder added
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- `Encoder.h`, various new types and functions
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- Type `ZydisRegisterKind` added
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- The `ZYDIS_ATTRIB_` defines were rebased (underlying bits were changed)
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- New type `ZydisDecodingFlags`
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- New type `ZydisDecoderContext`
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- An anonymous union was added around some fields in the `raw` part of `ZydisDecodedInstruction`
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- An anonymous union was added around the operand type specific fields in `ZydisDecodedOperand`
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- The previously anonymous sub-structs in `ZydisDecodedOperand` were lifted to
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the top level scope and are proper types now
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- Some of the previously anonymous sub-structs in `ZydisDecodedInstruction` were lifted to the top level scope as well
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- `ZydisDecodedOperand::type` was moved to a different location in the struct
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- Unions were added around fields in `ZydisDecodedOperand` and `ZydisDecodedInstruction`
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