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Use Builtin::WRAPPER_* in gen_wasm

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Richard Feldman 2022-07-13 11:55:15 -04:00
parent 25facfa9c6
commit aad922251d
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GPG Key ID: 7E4127D1E4241798
1 changed files with 32 additions and 4 deletions
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36
crates/compiler/gen_wasm/src/low_level.rs
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@ -312,7 +312,14 @@ impl<'a> LowLevelCall<'a> {
// List is stored as (pointer, length, capacity),
// with each of those fields being 4 bytes on wasm.
// So the length is 4 bytes after the start of the struct.
backend.code_builder.i32_load(Align::Bytes4, offset + 4);
//
// WRAPPER_LEN represents the index of the length field
// (which is 1 as of the writing of this comment). If the field order
// ever changes, WRAPPER_LEN should be updated and this logic should
// continue to work even though this comment may become inaccurate.
backend
.code_builder
.i32_load(Align::Bytes4, offset + (4 * Builtin::WRAPPER_LEN));
}
_ => internal_error!("invalid storage for List"),
},
@ -325,7 +332,14 @@ impl<'a> LowLevelCall<'a> {
// List is stored as (pointer, length, capacity),
// with each of those fields being 4 bytes on wasm.
// So the capacity is 8 bytes after the start of the struct.
backend.code_builder.i32_load(Align::Bytes4, offset + 8);
//
// WRAPPER_CAPACITY represents the index of the capacity field
// (which is 2 as of the writing of this comment). If the field order
// ever changes, WRAPPER_CAPACITY should be updated and this logic should
// continue to work even though this comment may become inaccurate.
backend
.code_builder
.i32_load(Align::Bytes4, offset + (4 * Builtin::WRAPPER_CAPACITY));
}
_ => internal_error!("invalid storage for List"),
},
@ -1806,7 +1820,14 @@ impl<'a> LowLevelCall<'a> {
// Dict is stored as (pointer, length, capacity),
// with each of those fields being 4 bytes on wasm.
// So the capacity is 8 bytes after the start of the struct.
backend.code_builder.i32_load(Align::Bytes4, offset + 8);
//
// WRAPPER_CAPACITY represents the index of the capacity field
// (which is 2 as of the writing of this comment). If the field order
// ever changes, WRAPPER_CAPACITY should be updated and this logic should
// continue to work even though this comment may become inaccurate.
backend
.code_builder
.i32_load(Align::Bytes4, offset + (4 * Builtin::WRAPPER_CAPACITY));
}
_ => internal_error!("invalid storage for Dict"),
},
@ -1819,7 +1840,14 @@ impl<'a> LowLevelCall<'a> {
// Set is stored as (pointer, length, capacity),
// with each of those fields being 4 bytes on wasm.
// So the capacity is 8 bytes after the start of the struct.
backend.code_builder.i32_load(Align::Bytes4, offset + 8);
//
// WRAPPER_CAPACITY represents the index of the capacity field
// (which is 2 as of the writing of this comment). If the field order
// ever changes, WRAPPER_CAPACITY should be updated and this logic should
// continue to work even though this comment may become inaccurate.
backend
.code_builder
.i32_load(Align::Bytes4, offset + (4 * Builtin::WRAPPER_CAPACITY));
}
_ => internal_error!("invalid storage for Dict"),
},