go.tools/ssa: new Function.Syntax() returns the declaring AST (debug mode) or just the Pos/End of the function's extent (otherwise).
R=gri
CC=golang-dev
https://golang.org/cl/16980043
diff --git a/ssa/ssa.go b/ssa/ssa.go
index e3624d4..d958e3a 100644
--- a/ssa/ssa.go
+++ b/ssa/ssa.go
@@ -268,6 +268,7 @@
pos token.Pos
Synthetic string // provenance of synthetic function; "" for true source functions
+ syntax ast.Node // *ast.Func{Decl,Lit}; replaced with simple ast.Node after build, unless debug mode
Enclosing *Function // enclosing function if anon; nil if global
Pkg *Package // enclosing package; nil for shared funcs (wrappers and error.Error)
Prog *Program // enclosing program
@@ -283,7 +284,6 @@
currentBlock *BasicBlock // where to emit code
objects map[types.Object]Value // addresses of local variables
namedResults []*Alloc // tuple of named results
- syntax *funcSyntax // abstract syntax trees for Go source functions
targets *targets // linked stack of branch targets
lblocks map[*ast.Object]*lblock // labelled blocks
}
@@ -1168,6 +1168,9 @@
// consistency is maintained during transformation passes by the
// ordinary SSA renaming machinery.)
//
+// DebugRefs are generated only for functions built with debugging
+// enabled; see Package.SetDebugMode().
+//
type DebugRef struct {
anInstruction
X Value // the value whose position we're declaring
