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73 lines
2.9 KiB
Rust
73 lines
2.9 KiB
Rust
/// These metadata fields contain VM state specific to a particular context.
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#[derive(Copy, Clone, Eq, PartialEq, Hash, Ord, PartialOrd, Debug)]
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pub(crate) enum ContextMetadata {
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/// The ID of the context which created this one.
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ParentContext = 0,
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/// The program counter to return to when we return to the parent context.
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ParentProgramCounter = 1,
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CalldataSize = 2,
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ReturndataSize = 3,
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/// The address of the account associated with this context.
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Address = 4,
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/// The size of the code under the account associated with this context.
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/// While this information could be obtained from the state trie, it is best to cache it since
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/// the `CODESIZE` instruction is very cheap.
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CodeSize = 5,
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/// The address of the caller who spawned this context.
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Caller = 6,
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/// The value (in wei) deposited by the caller.
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CallValue = 7,
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/// Whether this context was created by `STATICCALL`, in which case state changes are
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/// prohibited.
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Static = 8,
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/// Pointer to the initial version of the state trie, at the creation of this context. Used when
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/// we need to revert a context.
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StateTrieCheckpointPointer = 9,
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/// Size of the active main memory, in (32 byte) words.
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MemWords = 10,
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StackSize = 11,
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/// The gas limit for this call (not the entire transaction).
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GasLimit = 12,
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}
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impl ContextMetadata {
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pub(crate) const COUNT: usize = 13;
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pub(crate) fn all() -> [Self; Self::COUNT] {
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[
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Self::ParentContext,
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Self::ParentProgramCounter,
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Self::CalldataSize,
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Self::ReturndataSize,
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Self::Address,
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Self::CodeSize,
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Self::Caller,
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Self::CallValue,
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Self::Static,
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Self::StateTrieCheckpointPointer,
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Self::MemWords,
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Self::StackSize,
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Self::GasLimit,
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]
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}
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/// The variable name that gets passed into kernel assembly code.
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pub(crate) fn var_name(&self) -> &'static str {
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match self {
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ContextMetadata::ParentContext => "CTX_METADATA_PARENT_CONTEXT",
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ContextMetadata::ParentProgramCounter => "CTX_METADATA_PARENT_PC",
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ContextMetadata::CalldataSize => "CTX_METADATA_CALLDATA_SIZE",
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ContextMetadata::ReturndataSize => "CTX_METADATA_RETURNDATA_SIZE",
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ContextMetadata::Address => "CTX_METADATA_ADDRESS",
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ContextMetadata::CodeSize => "CTX_METADATA_CODE_SIZE",
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ContextMetadata::Caller => "CTX_METADATA_CALLER",
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ContextMetadata::CallValue => "CTX_METADATA_CALL_VALUE",
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ContextMetadata::Static => "CTX_METADATA_STATIC",
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ContextMetadata::StateTrieCheckpointPointer => "CTX_METADATA_STATE_TRIE_CHECKPOINT_PTR",
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ContextMetadata::MemWords => "CTX_METADATA_MEM_WORDS",
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ContextMetadata::StackSize => "CTX_METADATA_STACK_SIZE",
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ContextMetadata::GasLimit => "CTX_METADATA_GAS_LIMIT",
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}
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}
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}
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