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compiler: support sequence points in debug info

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Sequence points is a way to map a specific instruction offset
from a compiled contract to a text span in a source file.

This commit implements mapping only for `return` statements.
Further improvements are straight-forward.
This commit is contained in:
Evgenii Stratonikov 2020-03-31 16:57:35 +03:00
parent 24fef35ead
commit 5d3da26e1e
3 changed files with 52 additions and 1 deletions
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13
pkg/compiler/codegen.go
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@ -52,6 +52,11 @@ type codegen struct {
// A label to be used in the next statement.
nextLabel string
// sequencePoints is mapping from method name to a slice
// containing info about mapping from opcode's offset
// to a text span in the source file.
sequencePoints map[string][]DebugSeqPoint
// Label table for recording jump destinations.
l []int
}
@ -258,6 +263,7 @@ func (c *codegen) convertFuncDecl(file ast.Node, decl *ast.FuncDecl) {
// If this function returns the void (no return stmt) we will cleanup its junk on the stack.
if !hasReturnStmt(decl) {
c.saveSequencePoint(decl.Body)
emit.Opcode(c.prog.BinWriter, opcode.FROMALTSTACK)
emit.Opcode(c.prog.BinWriter, opcode.DROP)
emit.Opcode(c.prog.BinWriter, opcode.RET)
@ -303,7 +309,7 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
case *ast.AssignStmt:
multiRet := len(n.Rhs) != len(n.Lhs)
c.saveSequencePoint(n)
for i := 0; i < len(n.Lhs); i++ {
switch t := n.Lhs[i].(type) {
case *ast.Ident:
@ -407,6 +413,7 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
ast.Walk(c, n.Results[i])
}
c.saveSequencePoint(n)
emit.Opcode(c.prog.BinWriter, opcode.FROMALTSTACK)
emit.Opcode(c.prog.BinWriter, opcode.DROP) // Cleanup the stack.
emit.Opcode(c.prog.BinWriter, opcode.RET)
@ -648,6 +655,8 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
return nil
}
c.saveSequencePoint(n)
args := transformArgs(n.Fun, n.Args)
// Handle the arguments
@ -1298,6 +1307,8 @@ func newCodegen(info *buildInfo, pkg *loader.PackageInfo) *codegen {
funcs: map[string]*funcScope{},
labels: map[labelWithType]uint16{},
typeInfo: &pkg.Info,
sequencePoints: make(map[string][]DebugSeqPoint),
}
}