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Consistently uses LEB128 signed encoding for global constants (#443)

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Global constants can be defined in wasm or in ModuleBuilder. In either
case, they end up being decoded and interpreted during instantiation.
This chooses signed encoding to avoid surprises. A more comprehensive
explanation was added to RATIONALE.md, but the motivation was a global
100 coming out negative.

Signed-off-by: Adrian Cole <adrian@tetrate.io>
This commit is contained in:
Crypt Keeper
2022-04-06 09:50:47 +08:00
committed by GitHub
parent f5598c9a8e
commit fb0b311844
22 changed files with 188 additions and 68 deletions
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4
builder_test.go
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@@ -211,7 +211,7 @@ func TestNewModuleBuilder_Build(t *testing.T) {
GlobalSection: []*wasm.Global{
{
Type: &wasm.GlobalType{ValType: wasm.ValueTypeI32},
Init: &wasm.ConstantExpression{Opcode: wasm.OpcodeI32Const, Data: leb128.EncodeUint32(1024)},
Init: &wasm.ConstantExpression{Opcode: wasm.OpcodeI32Const, Data: leb128.EncodeInt32(1024)},
},
},
ExportSection: map[string]*wasm.Export{
@@ -262,7 +262,7 @@ func TestNewModuleBuilder_Build(t *testing.T) {
GlobalSection: []*wasm.Global{
{
Type: &wasm.GlobalType{ValType: wasm.ValueTypeI64},
Init: &wasm.ConstantExpression{Opcode: wasm.OpcodeI64Const, Data: leb128.EncodeUint64(math.MaxInt64)},
Init: &wasm.ConstantExpression{Opcode: wasm.OpcodeI64Const, Data: leb128.EncodeInt64(math.MaxInt64)},
},
},
ExportSection: map[string]*wasm.Export{